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- ffmpeg Documentation
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- <h1>
- ffmpeg Documentation
- </h1>
- <a name="SEC_Top"></a>
- <div class="element-contents" id="SEC_Contents">
- <h2 class="contents-heading">Table of Contents</h2>
- <div class="contents">
- <ul class="toc-numbered-mark">
- <li><a id="toc-Synopsis" href="#Synopsis">1 Synopsis</a></li>
- <li><a id="toc-Description" href="#Description">2 Description</a></li>
- <li><a id="toc-Detailed-description" href="#Detailed-description">3 Detailed description</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Streamcopy" href="#Streamcopy">3.1 Streamcopy</a></li>
- <li><a id="toc-Transcoding" href="#Transcoding">3.2 Transcoding</a></li>
- <li><a id="toc-Filtering" href="#Filtering">3.3 Filtering</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Simple-filtergraphs" href="#Simple-filtergraphs">3.3.1 Simple filtergraphs</a></li>
- <li><a id="toc-Complex-filtergraphs" href="#Complex-filtergraphs">3.3.2 Complex filtergraphs</a></li>
- </ul></li>
- <li><a id="toc-Loopback-decoders-1" href="#Loopback-decoders-1">3.4 Loopback decoders</a></li>
- </ul></li>
- <li><a id="toc-Stream-selection-1" href="#Stream-selection-1">4 Stream selection</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Description-1" href="#Description-1">4.1 Description</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Automatic-stream-selection" href="#Automatic-stream-selection">4.1.1 Automatic stream selection</a></li>
- <li><a id="toc-Manual-stream-selection" href="#Manual-stream-selection">4.1.2 Manual stream selection</a></li>
- <li><a id="toc-Complex-filtergraphs-1" href="#Complex-filtergraphs-1">4.1.3 Complex filtergraphs</a></li>
- <li><a id="toc-Stream-handling" href="#Stream-handling">4.1.4 Stream handling</a></li>
- </ul></li>
- <li><a id="toc-Examples" href="#Examples">4.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-Options" href="#Options">5 Options</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Stream-specifiers-1" href="#Stream-specifiers-1">5.1 Stream specifiers</a></li>
- <li><a id="toc-Generic-options" href="#Generic-options">5.2 Generic options</a></li>
- <li><a id="toc-AVOptions" href="#AVOptions">5.3 AVOptions</a></li>
- <li><a id="toc-Main-options" href="#Main-options">5.4 Main options</a></li>
- <li><a id="toc-Video-Options" href="#Video-Options">5.5 Video Options</a></li>
- <li><a id="toc-Advanced-Video-options" href="#Advanced-Video-options">5.6 Advanced Video options</a></li>
- <li><a id="toc-Audio-Options" href="#Audio-Options">5.7 Audio Options</a></li>
- <li><a id="toc-Advanced-Audio-options" href="#Advanced-Audio-options">5.8 Advanced Audio options</a></li>
- <li><a id="toc-Subtitle-options" href="#Subtitle-options">5.9 Subtitle options</a></li>
- <li><a id="toc-Advanced-Subtitle-options" href="#Advanced-Subtitle-options">5.10 Advanced Subtitle options</a></li>
- <li><a id="toc-Advanced-options" href="#Advanced-options">5.11 Advanced options</a></li>
- <li><a id="toc-Preset-files" href="#Preset-files">5.12 Preset files</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-ffpreset-files" href="#ffpreset-files">5.12.1 ffpreset files</a></li>
- <li><a id="toc-avpreset-files" href="#avpreset-files">5.12.2 avpreset files</a></li>
- </ul></li>
- <li><a id="toc-vstats-file-format" href="#vstats-file-format">5.13 vstats file format</a></li>
- </ul></li>
- <li><a id="toc-Examples-1" href="#Examples-1">6 Examples</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Video-and-Audio-grabbing" href="#Video-and-Audio-grabbing">6.1 Video and Audio grabbing</a></li>
- <li><a id="toc-X11-grabbing" href="#X11-grabbing">6.2 X11 grabbing</a></li>
- <li><a id="toc-Video-and-Audio-file-format-conversion" href="#Video-and-Audio-file-format-conversion">6.3 Video and Audio file format conversion</a></li>
- </ul></li>
- <li><a id="toc-Syntax" href="#Syntax">7 Syntax</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Quoting-and-escaping" href="#Quoting-and-escaping">7.1 Quoting and escaping</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-2" href="#Examples-2">7.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-Date" href="#Date">7.2 Date</a></li>
- <li><a id="toc-Time-duration" href="#Time-duration">7.3 Time duration</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-3" href="#Examples-3">7.3.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-Video-size" href="#Video-size">7.4 Video size</a></li>
- <li><a id="toc-Video-rate" href="#Video-rate">7.5 Video rate</a></li>
- <li><a id="toc-Ratio" href="#Ratio">7.6 Ratio</a></li>
- <li><a id="toc-Color" href="#Color">7.7 Color</a></li>
- <li><a id="toc-Channel-Layout" href="#Channel-Layout">7.8 Channel Layout</a></li>
- </ul></li>
- <li><a id="toc-Expression-Evaluation" href="#Expression-Evaluation">8 Expression Evaluation</a></li>
- <li><a id="toc-Codec-Options" href="#Codec-Options">9 Codec Options</a></li>
- <li><a id="toc-Decoders" href="#Decoders">10 Decoders</a></li>
- <li><a id="toc-Video-Decoders" href="#Video-Decoders">11 Video Decoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-av1" href="#av1">11.1 av1</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-1" href="#Options-1">11.1.1 Options</a></li>
- </ul></li>
- <li><a id="toc-hevc" href="#hevc">11.2 hevc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-2" href="#Options-2">11.2.1 Options</a></li>
- </ul></li>
- <li><a id="toc-rawvideo" href="#rawvideo">11.3 rawvideo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-3" href="#Options-3">11.3.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libdav1d" href="#libdav1d">11.4 libdav1d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-4" href="#Options-4">11.4.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libdavs2" href="#libdavs2">11.5 libdavs2</a></li>
- <li><a id="toc-libuavs3d" href="#libuavs3d">11.6 libuavs3d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-5" href="#Options-5">11.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libxevd" href="#libxevd">11.7 libxevd</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-6" href="#Options-6">11.7.1 Options</a></li>
- </ul></li>
- <li><a id="toc-QSV-Decoders" href="#QSV-Decoders">11.8 QSV Decoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Common-Options" href="#Common-Options">11.8.1 Common Options</a></li>
- <li><a id="toc-HEVC-Options" href="#HEVC-Options">11.8.2 HEVC Options</a></li>
- </ul></li>
- <li><a id="toc-v210" href="#v210">11.9 v210</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-7" href="#Options-7">11.9.1 Options</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Audio-Decoders" href="#Audio-Decoders">12 Audio Decoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-ac3" href="#ac3">12.1 ac3</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-AC_002d3-Decoder-Options" href="#AC_002d3-Decoder-Options">12.1.1 AC-3 Decoder Options</a></li>
- </ul></li>
- <li><a id="toc-flac-1" href="#flac-1">12.2 flac</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-FLAC-Decoder-options" href="#FLAC-Decoder-options">12.2.1 FLAC Decoder options</a></li>
- </ul></li>
- <li><a id="toc-ffwavesynth" href="#ffwavesynth">12.3 ffwavesynth</a></li>
- <li><a id="toc-libcelt" href="#libcelt">12.4 libcelt</a></li>
- <li><a id="toc-libgsm" href="#libgsm">12.5 libgsm</a></li>
- <li><a id="toc-libilbc" href="#libilbc">12.6 libilbc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-8" href="#Options-8">12.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libmpeghdec" href="#libmpeghdec">12.7 libmpeghdec</a></li>
- <li><a id="toc-libopencore_002damrnb" href="#libopencore_002damrnb">12.8 libopencore-amrnb</a></li>
- <li><a id="toc-libopencore_002damrwb" href="#libopencore_002damrwb">12.9 libopencore-amrwb</a></li>
- <li><a id="toc-libopus" href="#libopus">12.10 libopus</a></li>
- </ul></li>
- <li><a id="toc-Subtitles-Decoders" href="#Subtitles-Decoders">13 Subtitles Decoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-libaribb24" href="#libaribb24">13.1 libaribb24</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-libaribb24-Decoder-Options" href="#libaribb24-Decoder-Options">13.1.1 libaribb24 Decoder Options</a></li>
- </ul></li>
- <li><a id="toc-libaribcaption" href="#libaribcaption">13.2 libaribcaption</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-libaribcaption-Decoder-Options" href="#libaribcaption-Decoder-Options">13.2.1 libaribcaption Decoder Options</a></li>
- <li><a id="toc-libaribcaption-decoder-usage-examples" href="#libaribcaption-decoder-usage-examples">13.2.2 libaribcaption decoder usage examples</a></li>
- </ul></li>
- <li><a id="toc-dvbsub" href="#dvbsub">13.3 dvbsub</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-9" href="#Options-9">13.3.1 Options</a></li>
- </ul></li>
- <li><a id="toc-dvdsub" href="#dvdsub">13.4 dvdsub</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-10" href="#Options-10">13.4.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libzvbi_002dteletext" href="#libzvbi_002dteletext">13.5 libzvbi-teletext</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-11" href="#Options-11">13.5.1 Options</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Encoders" href="#Encoders">14 Encoders</a></li>
- <li><a id="toc-Audio-Encoders" href="#Audio-Encoders">15 Audio Encoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-aac" href="#aac">15.1 aac</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-12" href="#Options-12">15.1.1 Options</a></li>
- </ul></li>
- <li><a id="toc-ac3-and-ac3_005ffixed" href="#ac3-and-ac3_005ffixed">15.2 ac3 and ac3_fixed</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-AC_002d3-Metadata" href="#AC_002d3-Metadata">15.2.1 AC-3 Metadata</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Metadata-Control-Options" href="#Metadata-Control-Options">15.2.1.1 Metadata Control Options</a></li>
- <li><a id="toc-Downmix-Levels" href="#Downmix-Levels">15.2.1.2 Downmix Levels</a></li>
- <li><a id="toc-Audio-Production-Information" href="#Audio-Production-Information">15.2.1.3 Audio Production Information</a></li>
- <li><a id="toc-Other-Metadata-Options" href="#Other-Metadata-Options">15.2.1.4 Other Metadata Options</a></li>
- </ul></li>
- <li><a id="toc-Extended-Bitstream-Information" href="#Extended-Bitstream-Information">15.2.2 Extended Bitstream Information</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Extended-Bitstream-Information-_002d-Part-1" href="#Extended-Bitstream-Information-_002d-Part-1">15.2.2.1 Extended Bitstream Information - Part 1</a></li>
- <li><a id="toc-Extended-Bitstream-Information-_002d-Part-2" href="#Extended-Bitstream-Information-_002d-Part-2">15.2.2.2 Extended Bitstream Information - Part 2</a></li>
- </ul></li>
- <li><a id="toc-Other-AC_002d3-Encoding-Options" href="#Other-AC_002d3-Encoding-Options">15.2.3 Other AC-3 Encoding Options</a></li>
- <li><a id="toc-Floating_002dPoint_002dOnly-AC_002d3-Encoding-Options" href="#Floating_002dPoint_002dOnly-AC_002d3-Encoding-Options">15.2.4 Floating-Point-Only AC-3 Encoding Options</a></li>
- </ul></li>
- <li><a id="toc-flac-2" href="#flac-2">15.3 flac</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-13" href="#Options-13">15.3.1 Options</a></li>
- </ul></li>
- <li><a id="toc-opus" href="#opus">15.4 opus</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-14" href="#Options-14">15.4.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libfdk_005faac" href="#libfdk_005faac">15.5 libfdk_aac</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-15" href="#Options-15">15.5.1 Options</a></li>
- <li><a id="toc-Examples-4" href="#Examples-4">15.5.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-liblc3" href="#liblc3">15.6 liblc3</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-16" href="#Options-16">15.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libmp3lame-1" href="#libmp3lame-1">15.7 libmp3lame</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-17" href="#Options-17">15.7.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libopencore_002damrnb-1" href="#libopencore_002damrnb-1">15.8 libopencore-amrnb</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-18" href="#Options-18">15.8.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libopus-1" href="#libopus-1">15.9 libopus</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Option-Mapping" href="#Option-Mapping">15.9.1 Option Mapping</a></li>
- </ul></li>
- <li><a id="toc-libshine-1" href="#libshine-1">15.10 libshine</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-19" href="#Options-19">15.10.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libtwolame" href="#libtwolame">15.11 libtwolame</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-20" href="#Options-20">15.11.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libvo_002damrwbenc" href="#libvo_002damrwbenc">15.12 libvo-amrwbenc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-21" href="#Options-21">15.12.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libvorbis" href="#libvorbis">15.13 libvorbis</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-22" href="#Options-22">15.13.1 Options</a></li>
- </ul></li>
- <li><a id="toc-mjpeg" href="#mjpeg">15.14 mjpeg</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-23" href="#Options-23">15.14.1 Options</a></li>
- </ul></li>
- <li><a id="toc-wavpack" href="#wavpack">15.15 wavpack</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-24" href="#Options-24">15.15.1 Options</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Shared-options" href="#Shared-options">15.15.1.1 Shared options</a></li>
- <li><a id="toc-Private-options" href="#Private-options">15.15.1.2 Private options</a></li>
- </ul></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Video-Encoders" href="#Video-Encoders">16 Video Encoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-a64_005fmulti_002c-a64_005fmulti5" href="#a64_005fmulti_002c-a64_005fmulti5">16.1 a64_multi, a64_multi5</a></li>
- <li><a id="toc-Cinepak" href="#Cinepak">16.2 Cinepak</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-25" href="#Options-25">16.2.1 Options</a></li>
- </ul></li>
- <li><a id="toc-ffv1-1" href="#ffv1-1">16.3 ffv1</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-26" href="#Options-26">16.3.1 Options</a></li>
- </ul></li>
- <li><a id="toc-GIF" href="#GIF">16.4 GIF</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-27" href="#Options-27">16.4.1 Options</a></li>
- </ul></li>
- <li><a id="toc-Hap" href="#Hap">16.5 Hap</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-28" href="#Options-28">16.5.1 Options</a></li>
- </ul></li>
- <li><a id="toc-jpeg2000" href="#jpeg2000">16.6 jpeg2000</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-29" href="#Options-29">16.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-librav1e" href="#librav1e">16.7 librav1e</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-30" href="#Options-30">16.7.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libaom_002dav1" href="#libaom_002dav1">16.8 libaom-av1</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-31" href="#Options-31">16.8.1 Options</a></li>
- </ul></li>
- <li><a id="toc-liboapv" href="#liboapv">16.9 liboapv</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-32" href="#Options-32">16.9.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libsvtav1" href="#libsvtav1">16.10 libsvtav1</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-33" href="#Options-33">16.10.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libsvtjpegxs" href="#libsvtjpegxs">16.11 libsvtjpegxs</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-34" href="#Options-34">16.11.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libjxl" href="#libjxl">16.12 libjxl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-35" href="#Options-35">16.12.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libkvazaar" href="#libkvazaar">16.13 libkvazaar</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-36" href="#Options-36">16.13.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libopenh264" href="#libopenh264">16.14 libopenh264</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-37" href="#Options-37">16.14.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libtheora" href="#libtheora">16.15 libtheora</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-38" href="#Options-38">16.15.1 Options</a></li>
- <li><a id="toc-Examples-5" href="#Examples-5">16.15.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-libvpx" href="#libvpx">16.16 libvpx</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-39" href="#Options-39">16.16.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libvvenc" href="#libvvenc">16.17 libvvenc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Supported-Pixel-Formats" href="#Supported-Pixel-Formats">16.17.1 Supported Pixel Formats</a></li>
- <li><a id="toc-Options-40" href="#Options-40">16.17.2 Options</a></li>
- </ul></li>
- <li><a id="toc-libwebp" href="#libwebp">16.18 libwebp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Pixel-Format" href="#Pixel-Format">16.18.1 Pixel Format</a></li>
- <li><a id="toc-Options-41" href="#Options-41">16.18.2 Options</a></li>
- </ul></li>
- <li><a id="toc-libx264_002c-libx264rgb" href="#libx264_002c-libx264rgb">16.19 libx264, libx264rgb</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Supported-Pixel-Formats-1" href="#Supported-Pixel-Formats-1">16.19.1 Supported Pixel Formats</a></li>
- <li><a id="toc-Options-42" href="#Options-42">16.19.2 Options</a></li>
- </ul></li>
- <li><a id="toc-libx265" href="#libx265">16.20 libx265</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-43" href="#Options-43">16.20.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libxavs2" href="#libxavs2">16.21 libxavs2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-44" href="#Options-44">16.21.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libxeve" href="#libxeve">16.22 libxeve</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-45" href="#Options-45">16.22.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libxvid" href="#libxvid">16.23 libxvid</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-46" href="#Options-46">16.23.1 Options</a></li>
- </ul></li>
- <li><a id="toc-MediaCodec" href="#MediaCodec">16.24 MediaCodec</a></li>
- <li><a id="toc-MediaFoundation" href="#MediaFoundation">16.25 MediaFoundation</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-47" href="#Options-47">16.25.1 Options</a></li>
- <li><a id="toc-Examples-6" href="#Examples-6">16.25.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-Microsoft-RLE" href="#Microsoft-RLE">16.26 Microsoft RLE</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-48" href="#Options-48">16.26.1 Options</a></li>
- </ul></li>
- <li><a id="toc-mpeg2" href="#mpeg2">16.27 mpeg2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-49" href="#Options-49">16.27.1 Options</a></li>
- </ul></li>
- <li><a id="toc-png" href="#png">16.28 png</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-50" href="#Options-50">16.28.1 Options</a></li>
- <li><a id="toc-Private-options-1" href="#Private-options-1">16.28.2 Private options</a></li>
- </ul></li>
- <li><a id="toc-ProRes" href="#ProRes">16.29 ProRes</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Private-Options-for-prores_002dks" href="#Private-Options-for-prores_002dks">16.29.1 Private Options for prores-ks</a></li>
- <li><a id="toc-Speed-considerations" href="#Speed-considerations">16.29.2 Speed considerations</a></li>
- </ul></li>
- <li><a id="toc-QSV-Encoders" href="#QSV-Encoders">16.30 QSV Encoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Ratecontrol-Method" href="#Ratecontrol-Method">16.30.1 Ratecontrol Method</a></li>
- <li><a id="toc-Global-Options-_002d_003e-MSDK-Options" href="#Global-Options-_002d_003e-MSDK-Options">16.30.2 Global Options -> MSDK Options</a></li>
- <li><a id="toc-Common-Options-1" href="#Common-Options-1">16.30.3 Common Options</a></li>
- <li><a id="toc-Runtime-Options" href="#Runtime-Options">16.30.4 Runtime Options</a></li>
- <li><a id="toc-H264-options" href="#H264-options">16.30.5 H264 options</a></li>
- <li><a id="toc-HEVC-Options-1" href="#HEVC-Options-1">16.30.6 HEVC Options</a></li>
- <li><a id="toc-MPEG2-Options" href="#MPEG2-Options">16.30.7 MPEG2 Options</a></li>
- <li><a id="toc-VP9-Options" href="#VP9-Options">16.30.8 VP9 Options</a></li>
- <li><a id="toc-AV1-Options" href="#AV1-Options">16.30.9 AV1 Options</a></li>
- </ul></li>
- <li><a id="toc-snow" href="#snow">16.31 snow</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-51" href="#Options-51">16.31.1 Options</a></li>
- </ul></li>
- <li><a id="toc-VAAPI-encoders" href="#VAAPI-encoders">16.32 VAAPI encoders</a></li>
- <li><a id="toc-vbn" href="#vbn">16.33 vbn</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-52" href="#Options-52">16.33.1 Options</a></li>
- </ul></li>
- <li><a id="toc-vc2" href="#vc2">16.34 vc2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-53" href="#Options-53">16.34.1 Options</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Subtitles-Encoders" href="#Subtitles-Encoders">17 Subtitles Encoders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-dvbsub-1" href="#dvbsub-1">17.1 dvbsub</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-54" href="#Options-54">17.1.1 Options</a></li>
- </ul></li>
- <li><a id="toc-dvdsub-1" href="#dvdsub-1">17.2 dvdsub</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-55" href="#Options-55">17.2.1 Options</a></li>
- </ul></li>
- <li><a id="toc-lrc" href="#lrc">17.3 lrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-56" href="#Options-56">17.3.1 Options</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Bitstream-Filters" href="#Bitstream-Filters">18 Bitstream Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-aac_005fadtstoasc" href="#aac_005fadtstoasc">18.1 aac_adtstoasc</a></li>
- <li><a id="toc-av1_005fmetadata" href="#av1_005fmetadata">18.2 av1_metadata</a></li>
- <li><a id="toc-chomp" href="#chomp">18.3 chomp</a></li>
- <li><a id="toc-dca_005fcore" href="#dca_005fcore">18.4 dca_core</a></li>
- <li><a id="toc-dovi_005frpu" href="#dovi_005frpu">18.5 dovi_rpu</a></li>
- <li><a id="toc-dump_005fextra" href="#dump_005fextra">18.6 dump_extra</a></li>
- <li><a id="toc-dv_005ferror_005fmarker" href="#dv_005ferror_005fmarker">18.7 dv_error_marker</a></li>
- <li><a id="toc-eac3_005fcore" href="#eac3_005fcore">18.8 eac3_core</a></li>
- <li><a id="toc-eia608_005fto_005fsmpte436m" href="#eia608_005fto_005fsmpte436m">18.9 eia608_to_smpte436m</a></li>
- <li><a id="toc-extract_005fextradata" href="#extract_005fextradata">18.10 extract_extradata</a></li>
- <li><a id="toc-filter_005funits" href="#filter_005funits">18.11 filter_units</a></li>
- <li><a id="toc-hapqa_005fextract" href="#hapqa_005fextract">18.12 hapqa_extract</a></li>
- <li><a id="toc-h264_005fmetadata" href="#h264_005fmetadata">18.13 h264_metadata</a></li>
- <li><a id="toc-h264_005fmp4toannexb" href="#h264_005fmp4toannexb">18.14 h264_mp4toannexb</a></li>
- <li><a id="toc-h264_005fredundant_005fpps" href="#h264_005fredundant_005fpps">18.15 h264_redundant_pps</a></li>
- <li><a id="toc-hevc_005fmetadata" href="#hevc_005fmetadata">18.16 hevc_metadata</a></li>
- <li><a id="toc-hevc_005fmp4toannexb" href="#hevc_005fmp4toannexb">18.17 hevc_mp4toannexb</a></li>
- <li><a id="toc-imxdump" href="#imxdump">18.18 imxdump</a></li>
- <li><a id="toc-mjpeg2jpeg" href="#mjpeg2jpeg">18.19 mjpeg2jpeg</a></li>
- <li><a id="toc-mjpegadump" href="#mjpegadump">18.20 mjpegadump</a></li>
- <li><a id="toc-mov2textsub-1" href="#mov2textsub-1">18.21 mov2textsub</a></li>
- <li><a id="toc-mpeg2_005fmetadata" href="#mpeg2_005fmetadata">18.22 mpeg2_metadata</a></li>
- <li><a id="toc-mpeg4_005funpack_005fbframes" href="#mpeg4_005funpack_005fbframes">18.23 mpeg4_unpack_bframes</a></li>
- <li><a id="toc-noise" href="#noise">18.24 noise</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-7" href="#Examples-7">18.24.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-null" href="#null">18.25 null</a></li>
- <li><a id="toc-pcm_005frechunk" href="#pcm_005frechunk">18.26 pcm_rechunk</a></li>
- <li><a id="toc-pgs_005fframe_005fmerge" href="#pgs_005fframe_005fmerge">18.27 pgs_frame_merge</a></li>
- <li><a id="toc-prores_005fmetadata" href="#prores_005fmetadata">18.28 prores_metadata</a></li>
- <li><a id="toc-remove_005fextra" href="#remove_005fextra">18.29 remove_extra</a></li>
- <li><a id="toc-setts" href="#setts">18.30 setts</a></li>
- <li><a id="toc-showinfo" href="#showinfo">18.31 showinfo</a></li>
- <li><a id="toc-smpte436m_005fto_005feia608" href="#smpte436m_005fto_005feia608">18.32 smpte436m_to_eia608</a></li>
- <li><a id="toc-text2movsub-1" href="#text2movsub-1">18.33 text2movsub</a></li>
- <li><a id="toc-trace_005fheaders" href="#trace_005fheaders">18.34 trace_headers</a></li>
- <li><a id="toc-truehd_005fcore" href="#truehd_005fcore">18.35 truehd_core</a></li>
- <li><a id="toc-vp9_005fmetadata" href="#vp9_005fmetadata">18.36 vp9_metadata</a></li>
- <li><a id="toc-vp9_005fsuperframe" href="#vp9_005fsuperframe">18.37 vp9_superframe</a></li>
- <li><a id="toc-vp9_005fsuperframe_005fsplit" href="#vp9_005fsuperframe_005fsplit">18.38 vp9_superframe_split</a></li>
- <li><a id="toc-vp9_005fraw_005freorder" href="#vp9_005fraw_005freorder">18.39 vp9_raw_reorder</a></li>
- </ul></li>
- <li><a id="toc-Format-Options" href="#Format-Options">19 Format Options</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Format-stream-specifiers-1" href="#Format-stream-specifiers-1">19.1 Format stream specifiers</a></li>
- </ul></li>
- <li><a id="toc-Demuxers" href="#Demuxers">20 Demuxers</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-aa" href="#aa">20.1 aa</a></li>
- <li><a id="toc-aac-1" href="#aac-1">20.2 aac</a></li>
- <li><a id="toc-apng" href="#apng">20.3 apng</a></li>
- <li><a id="toc-asf-1" href="#asf-1">20.4 asf</a></li>
- <li><a id="toc-concat-1" href="#concat-1">20.5 concat</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Syntax-1" href="#Syntax-1">20.5.1 Syntax</a></li>
- <li><a id="toc-Options-57" href="#Options-57">20.5.2 Options</a></li>
- <li><a id="toc-Examples-8" href="#Examples-8">20.5.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-dash-1" href="#dash-1">20.6 dash</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-58" href="#Options-58">20.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-dvdvideo" href="#dvdvideo">20.7 dvdvideo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Background" href="#Background">20.7.1 Background</a></li>
- <li><a id="toc-Options-59" href="#Options-59">20.7.2 Options</a></li>
- <li><a id="toc-Examples-9" href="#Examples-9">20.7.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-ea" href="#ea">20.8 ea</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-60" href="#Options-60">20.8.1 Options</a></li>
- </ul></li>
- <li><a id="toc-imf" href="#imf">20.9 imf</a></li>
- <li><a id="toc-flv_002c-live_005fflv_002c-kux" href="#flv_002c-live_005fflv_002c-kux">20.10 flv, live_flv, kux</a></li>
- <li><a id="toc-gif-1" href="#gif-1">20.11 gif</a></li>
- <li><a id="toc-hls-1" href="#hls-1">20.12 hls</a></li>
- <li><a id="toc-image2-1" href="#image2-1">20.13 image2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-10" href="#Examples-10">20.13.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-libgme" href="#libgme">20.14 libgme</a></li>
- <li><a id="toc-libmodplug" href="#libmodplug">20.15 libmodplug</a></li>
- <li><a id="toc-libopenmpt" href="#libopenmpt">20.16 libopenmpt</a></li>
- <li><a id="toc-mcc" href="#mcc">20.17 mcc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-11" href="#Examples-11">20.17.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-mov_002fmp4_002f3gp" href="#mov_002fmp4_002f3gp">20.18 mov/mp4/3gp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-61" href="#Options-61">20.18.1 Options</a></li>
- <li><a id="toc-Audible-AAX" href="#Audible-AAX">20.18.2 Audible AAX</a></li>
- </ul></li>
- <li><a id="toc-mpegts" href="#mpegts">20.19 mpegts</a></li>
- <li><a id="toc-mpjpeg" href="#mpjpeg">20.20 mpjpeg</a></li>
- <li><a id="toc-rawvideo-1" href="#rawvideo-1">20.21 rawvideo</a></li>
- <li><a id="toc-rcwt" href="#rcwt">20.22 rcwt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-12" href="#Examples-12">20.22.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-sbg" href="#sbg">20.23 sbg</a></li>
- <li><a id="toc-tedcaptions" href="#tedcaptions">20.24 tedcaptions</a></li>
- <li><a id="toc-vapoursynth" href="#vapoursynth">20.25 vapoursynth</a></li>
- <li><a id="toc-w64" href="#w64">20.26 w64</a></li>
- <li><a id="toc-wav-1" href="#wav-1">20.27 wav</a></li>
- </ul></li>
- <li><a id="toc-Muxers" href="#Muxers">21 Muxers</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Raw-muxers" href="#Raw-muxers">21.1 Raw muxers</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-13" href="#Examples-13">21.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-Raw-PCM-muxers" href="#Raw-PCM-muxers">21.2 Raw PCM muxers</a></li>
- <li><a id="toc-MPEG_002d1_002fMPEG_002d2-program-stream-muxers" href="#MPEG_002d1_002fMPEG_002d2-program-stream-muxers">21.3 MPEG-1/MPEG-2 program stream muxers</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-62" href="#Options-62">21.3.1 Options</a></li>
- </ul></li>
- <li><a id="toc-MOV_002fMPEG_002d4_002fISOMBFF-muxers" href="#MOV_002fMPEG_002d4_002fISOMBFF-muxers">21.4 MOV/MPEG-4/ISOMBFF muxers</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Fragmentation" href="#Fragmentation">21.4.1 Fragmentation</a></li>
- <li><a id="toc-Options-63" href="#Options-63">21.4.2 Options</a></li>
- <li><a id="toc-Examples-14" href="#Examples-14">21.4.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-a64-1" href="#a64-1">21.5 a64</a></li>
- <li><a id="toc-ac4" href="#ac4">21.6 ac4</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-64" href="#Options-64">21.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-adts-1" href="#adts-1">21.7 adts</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-65" href="#Options-65">21.7.1 Options</a></li>
- </ul></li>
- <li><a id="toc-aea-1" href="#aea-1">21.8 aea</a></li>
- <li><a id="toc-aiff-1" href="#aiff-1">21.9 aiff</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-66" href="#Options-66">21.9.1 Options</a></li>
- </ul></li>
- <li><a id="toc-alp-1" href="#alp-1">21.10 alp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-67" href="#Options-67">21.10.1 Options</a></li>
- </ul></li>
- <li><a id="toc-amr" href="#amr">21.11 amr</a></li>
- <li><a id="toc-amv" href="#amv">21.12 amv</a></li>
- <li><a id="toc-apm" href="#apm">21.13 apm</a></li>
- <li><a id="toc-apng-1" href="#apng-1">21.14 apng</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-68" href="#Options-68">21.14.1 Options</a></li>
- <li><a id="toc-Examples-15" href="#Examples-15">21.14.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-argo_005fasf" href="#argo_005fasf">21.15 argo_asf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-69" href="#Options-69">21.15.1 Options</a></li>
- </ul></li>
- <li><a id="toc-argo_005fcvg" href="#argo_005fcvg">21.16 argo_cvg</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-70" href="#Options-70">21.16.1 Options</a></li>
- </ul></li>
- <li><a id="toc-asf_002c-asf_005fstream" href="#asf_002c-asf_005fstream">21.17 asf, asf_stream</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-71" href="#Options-71">21.17.1 Options</a></li>
- </ul></li>
- <li><a id="toc-ass" href="#ass">21.18 ass</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-72" href="#Options-72">21.18.1 Options</a></li>
- </ul></li>
- <li><a id="toc-ast" href="#ast">21.19 ast</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-73" href="#Options-73">21.19.1 Options</a></li>
- </ul></li>
- <li><a id="toc-au" href="#au">21.20 au</a></li>
- <li><a id="toc-avi-1" href="#avi-1">21.21 avi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-74" href="#Options-74">21.21.1 Options</a></li>
- </ul></li>
- <li><a id="toc-avif" href="#avif">21.22 avif</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-75" href="#Options-75">21.22.1 Options</a></li>
- </ul></li>
- <li><a id="toc-avm2" href="#avm2">21.23 avm2</a></li>
- <li><a id="toc-bit" href="#bit">21.24 bit</a></li>
- <li><a id="toc-caf" href="#caf">21.25 caf</a></li>
- <li><a id="toc-codec2" href="#codec2">21.26 codec2</a></li>
- <li><a id="toc-chromaprint-1" href="#chromaprint-1">21.27 chromaprint</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-76" href="#Options-76">21.27.1 Options</a></li>
- </ul></li>
- <li><a id="toc-crc-1" href="#crc-1">21.28 crc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-16" href="#Examples-16">21.28.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-dash-2" href="#dash-2">21.29 dash</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-77" href="#Options-77">21.29.1 Options</a></li>
- <li><a id="toc-Example" href="#Example">21.29.2 Example</a></li>
- </ul></li>
- <li><a id="toc-daud" href="#daud">21.30 daud</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-1" href="#Example-1">21.30.1 Example</a></li>
- </ul></li>
- <li><a id="toc-dv" href="#dv">21.31 dv</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-2" href="#Example-2">21.31.1 Example</a></li>
- </ul></li>
- <li><a id="toc-ffmetadata" href="#ffmetadata">21.32 ffmetadata</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-3" href="#Example-3">21.32.1 Example</a></li>
- </ul></li>
- <li><a id="toc-fifo-1" href="#fifo-1">21.33 fifo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-78" href="#Options-78">21.33.1 Options</a></li>
- <li><a id="toc-Example-4" href="#Example-4">21.33.2 Example</a></li>
- </ul></li>
- <li><a id="toc-film_005fcpk" href="#film_005fcpk">21.34 film_cpk</a></li>
- <li><a id="toc-filmstrip" href="#filmstrip">21.35 filmstrip</a></li>
- <li><a id="toc-fits" href="#fits">21.36 fits</a></li>
- <li><a id="toc-flac-3" href="#flac-3">21.37 flac</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-79" href="#Options-79">21.37.1 Options</a></li>
- <li><a id="toc-Example-5" href="#Example-5">21.37.2 Example</a></li>
- </ul></li>
- <li><a id="toc-flv" href="#flv">21.38 flv</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-80" href="#Options-80">21.38.1 Options</a></li>
- </ul></li>
- <li><a id="toc-framecrc-1" href="#framecrc-1">21.39 framecrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-17" href="#Examples-17">21.39.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-framehash-1" href="#framehash-1">21.40 framehash</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-18" href="#Examples-18">21.40.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-framemd5-1" href="#framemd5-1">21.41 framemd5</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-19" href="#Examples-19">21.41.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-gif-2" href="#gif-2">21.42 gif</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-81" href="#Options-81">21.42.1 Options</a></li>
- <li><a id="toc-Example-6" href="#Example-6">21.42.2 Example</a></li>
- </ul></li>
- <li><a id="toc-gxf" href="#gxf">21.43 gxf</a></li>
- <li><a id="toc-hash-1" href="#hash-1">21.44 hash</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-20" href="#Examples-20">21.44.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-hds-1" href="#hds-1">21.45 hds</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-82" href="#Options-82">21.45.1 Options</a></li>
- <li><a id="toc-Example-7" href="#Example-7">21.45.2 Example</a></li>
- </ul></li>
- <li><a id="toc-hls-2" href="#hls-2">21.46 hls</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-83" href="#Options-83">21.46.1 Options</a></li>
- </ul></li>
- <li><a id="toc-iamf" href="#iamf">21.47 iamf</a></li>
- <li><a id="toc-ico-1" href="#ico-1">21.48 ico</a></li>
- <li><a id="toc-ilbc" href="#ilbc">21.49 ilbc</a></li>
- <li><a id="toc-image2_002c-image2pipe" href="#image2_002c-image2pipe">21.50 image2, image2pipe</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-84" href="#Options-84">21.50.1 Options</a></li>
- <li><a id="toc-Examples-21" href="#Examples-21">21.50.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-ircam" href="#ircam">21.51 ircam</a></li>
- <li><a id="toc-ivf" href="#ivf">21.52 ivf</a></li>
- <li><a id="toc-jacosub" href="#jacosub">21.53 jacosub</a></li>
- <li><a id="toc-kvag" href="#kvag">21.54 kvag</a></li>
- <li><a id="toc-lc3" href="#lc3">21.55 lc3</a></li>
- <li><a id="toc-lrc-1" href="#lrc-1">21.56 lrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Metadata" href="#Metadata">21.56.1 Metadata</a></li>
- </ul></li>
- <li><a id="toc-matroska" href="#matroska">21.57 matroska</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Metadata-1" href="#Metadata-1">21.57.1 Metadata</a></li>
- <li><a id="toc-Options-85" href="#Options-85">21.57.2 Options</a></li>
- </ul></li>
- <li><a id="toc-md5-1" href="#md5-1">21.58 md5</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-22" href="#Examples-22">21.58.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-mcc-1" href="#mcc-1">21.59 mcc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-86" href="#Options-86">21.59.1 Options</a></li>
- <li><a id="toc-Examples-23" href="#Examples-23">21.59.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-microdvd" href="#microdvd">21.60 microdvd</a></li>
- <li><a id="toc-mmf" href="#mmf">21.61 mmf</a></li>
- <li><a id="toc-mp3" href="#mp3">21.62 mp3</a></li>
- <li><a id="toc-mpegts-1" href="#mpegts-1">21.63 mpegts</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-87" href="#Options-87">21.63.1 Options</a></li>
- <li><a id="toc-Example-8" href="#Example-8">21.63.2 Example</a></li>
- </ul></li>
- <li><a id="toc-mxf_002c-mxf_005fd10_002c-mxf_005fopatom" href="#mxf_002c-mxf_005fd10_002c-mxf_005fopatom">21.64 mxf, mxf_d10, mxf_opatom</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-88" href="#Options-88">21.64.1 Options</a></li>
- </ul></li>
- <li><a id="toc-null-1" href="#null-1">21.65 null</a></li>
- <li><a id="toc-nut" href="#nut">21.66 nut</a></li>
- <li><a id="toc-ogg" href="#ogg">21.67 ogg</a></li>
- <li><a id="toc-rcwt-1" href="#rcwt-1">21.68 rcwt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-24" href="#Examples-24">21.68.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-segment_002c-stream_005fsegment_002c-ssegment" href="#segment_002c-stream_005fsegment_002c-ssegment">21.69 segment, stream_segment, ssegment</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-89" href="#Options-89">21.69.1 Options</a></li>
- <li><a id="toc-Examples-25" href="#Examples-25">21.69.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-smoothstreaming" href="#smoothstreaming">21.70 smoothstreaming</a></li>
- <li><a id="toc-streamhash-1" href="#streamhash-1">21.71 streamhash</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-26" href="#Examples-26">21.71.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-tee-1" href="#tee-1">21.72 tee</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-90" href="#Options-90">21.72.1 Options</a></li>
- <li><a id="toc-Examples-27" href="#Examples-27">21.72.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-webm_005fchunk" href="#webm_005fchunk">21.73 webm_chunk</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-91" href="#Options-91">21.73.1 Options</a></li>
- <li><a id="toc-Example-9" href="#Example-9">21.73.2 Example</a></li>
- </ul></li>
- <li><a id="toc-webm_005fdash_005fmanifest" href="#webm_005fdash_005fmanifest">21.74 webm_dash_manifest</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-92" href="#Options-92">21.74.1 Options</a></li>
- <li><a id="toc-Example-10" href="#Example-10">21.74.2 Example</a></li>
- </ul></li>
- <li><a id="toc-whip-1" href="#whip-1">21.75 whip</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-93" href="#Options-93">21.75.1 Options</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Metadata-2" href="#Metadata-2">22 Metadata</a></li>
- <li><a id="toc-Protocol-Options" href="#Protocol-Options">23 Protocol Options</a></li>
- <li><a id="toc-Protocols" href="#Protocols">24 Protocols</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-amqp" href="#amqp">24.1 amqp</a></li>
- <li><a id="toc-async" href="#async">24.2 async</a></li>
- <li><a id="toc-bluray" href="#bluray">24.3 bluray</a></li>
- <li><a id="toc-cache" href="#cache">24.4 cache</a></li>
- <li><a id="toc-concat-2" href="#concat-2">24.5 concat</a></li>
- <li><a id="toc-concatf" href="#concatf">24.6 concatf</a></li>
- <li><a id="toc-crypto" href="#crypto">24.7 crypto</a></li>
- <li><a id="toc-data" href="#data">24.8 data</a></li>
- <li><a id="toc-fd" href="#fd">24.9 fd</a></li>
- <li><a id="toc-file" href="#file">24.10 file</a></li>
- <li><a id="toc-ftp" href="#ftp">24.11 ftp</a></li>
- <li><a id="toc-gopher" href="#gopher">24.12 gopher</a></li>
- <li><a id="toc-gophers" href="#gophers">24.13 gophers</a></li>
- <li><a id="toc-hls-3" href="#hls-3">24.14 hls</a></li>
- <li><a id="toc-http" href="#http">24.15 http</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-HTTP-Cookies" href="#HTTP-Cookies">24.15.1 HTTP Cookies</a></li>
- </ul></li>
- <li><a id="toc-Icecast" href="#Icecast">24.16 Icecast</a></li>
- <li><a id="toc-ipfs" href="#ipfs">24.17 ipfs</a></li>
- <li><a id="toc-mmst" href="#mmst">24.18 mmst</a></li>
- <li><a id="toc-mmsh" href="#mmsh">24.19 mmsh</a></li>
- <li><a id="toc-md5-2" href="#md5-2">24.20 md5</a></li>
- <li><a id="toc-pipe" href="#pipe">24.21 pipe</a></li>
- <li><a id="toc-prompeg" href="#prompeg">24.22 prompeg</a></li>
- <li><a id="toc-rist" href="#rist">24.23 rist</a></li>
- <li><a id="toc-rtmp" href="#rtmp">24.24 rtmp</a></li>
- <li><a id="toc-rtmpe" href="#rtmpe">24.25 rtmpe</a></li>
- <li><a id="toc-rtmps" href="#rtmps">24.26 rtmps</a></li>
- <li><a id="toc-rtmpt" href="#rtmpt">24.27 rtmpt</a></li>
- <li><a id="toc-rtmpte" href="#rtmpte">24.28 rtmpte</a></li>
- <li><a id="toc-rtmpts" href="#rtmpts">24.29 rtmpts</a></li>
- <li><a id="toc-libsmbclient" href="#libsmbclient">24.30 libsmbclient</a></li>
- <li><a id="toc-libssh" href="#libssh">24.31 libssh</a></li>
- <li><a id="toc-librtmp-rtmp_002c-rtmpe_002c-rtmps_002c-rtmpt_002c-rtmpte" href="#librtmp-rtmp_002c-rtmpe_002c-rtmps_002c-rtmpt_002c-rtmpte">24.32 librtmp rtmp, rtmpe, rtmps, rtmpt, rtmpte</a></li>
- <li><a id="toc-rtp" href="#rtp">24.33 rtp</a></li>
- <li><a id="toc-rtsp" href="#rtsp">24.34 rtsp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Muxer" href="#Muxer">24.34.1 Muxer</a></li>
- <li><a id="toc-Demuxer" href="#Demuxer">24.34.2 Demuxer</a></li>
- <li><a id="toc-Examples-28" href="#Examples-28">24.34.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-sap" href="#sap">24.35 sap</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Muxer-1" href="#Muxer-1">24.35.1 Muxer</a></li>
- <li><a id="toc-Demuxer-1" href="#Demuxer-1">24.35.2 Demuxer</a></li>
- </ul></li>
- <li><a id="toc-sctp" href="#sctp">24.36 sctp</a></li>
- <li><a id="toc-srt" href="#srt">24.37 srt</a></li>
- <li><a id="toc-srtp" href="#srtp">24.38 srtp</a></li>
- <li><a id="toc-subfile" href="#subfile">24.39 subfile</a></li>
- <li><a id="toc-tee-2" href="#tee-2">24.40 tee</a></li>
- <li><a id="toc-tcp" href="#tcp">24.41 tcp</a></li>
- <li><a id="toc-tls" href="#tls">24.42 tls</a></li>
- <li><a id="toc-dtls" href="#dtls">24.43 dtls</a></li>
- <li><a id="toc-udp" href="#udp">24.44 udp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-29" href="#Examples-29">24.44.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-unix" href="#unix">24.45 unix</a></li>
- <li><a id="toc-zmq" href="#zmq">24.46 zmq</a></li>
- </ul></li>
- <li><a id="toc-Device-Options" href="#Device-Options">25 Device Options</a></li>
- <li><a id="toc-Input-Devices" href="#Input-Devices">26 Input Devices</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-alsa" href="#alsa">26.1 alsa</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-94" href="#Options-94">26.1.1 Options</a></li>
- </ul></li>
- <li><a id="toc-android_005fcamera" href="#android_005fcamera">26.2 android_camera</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-95" href="#Options-95">26.2.1 Options</a></li>
- </ul></li>
- <li><a id="toc-avfoundation" href="#avfoundation">26.3 avfoundation</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-96" href="#Options-96">26.3.1 Options</a></li>
- <li><a id="toc-Examples-30" href="#Examples-30">26.3.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-decklink" href="#decklink">26.4 decklink</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-97" href="#Options-97">26.4.1 Options</a></li>
- <li><a id="toc-Examples-31" href="#Examples-31">26.4.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-dshow" href="#dshow">26.5 dshow</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-98" href="#Options-98">26.5.1 Options</a></li>
- <li><a id="toc-Examples-32" href="#Examples-32">26.5.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-fbdev" href="#fbdev">26.6 fbdev</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-99" href="#Options-99">26.6.1 Options</a></li>
- </ul></li>
- <li><a id="toc-gdigrab" href="#gdigrab">26.7 gdigrab</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-100" href="#Options-100">26.7.1 Options</a></li>
- </ul></li>
- <li><a id="toc-iec61883" href="#iec61883">26.8 iec61883</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-101" href="#Options-101">26.8.1 Options</a></li>
- <li><a id="toc-Examples-33" href="#Examples-33">26.8.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-jack" href="#jack">26.9 jack</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-102" href="#Options-102">26.9.1 Options</a></li>
- </ul></li>
- <li><a id="toc-kmsgrab" href="#kmsgrab">26.10 kmsgrab</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-103" href="#Options-103">26.10.1 Options</a></li>
- <li><a id="toc-Examples-34" href="#Examples-34">26.10.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-lavfi" href="#lavfi">26.11 lavfi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-104" href="#Options-104">26.11.1 Options</a></li>
- <li><a id="toc-Examples-35" href="#Examples-35">26.11.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-libcdio" href="#libcdio">26.12 libcdio</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-105" href="#Options-105">26.12.1 Options</a></li>
- </ul></li>
- <li><a id="toc-libdc1394" href="#libdc1394">26.13 libdc1394</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-106" href="#Options-106">26.13.1 Options</a></li>
- </ul></li>
- <li><a id="toc-openal" href="#openal">26.14 openal</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-107" href="#Options-107">26.14.1 Options</a></li>
- <li><a id="toc-Examples-36" href="#Examples-36">26.14.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-oss" href="#oss">26.15 oss</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-108" href="#Options-108">26.15.1 Options</a></li>
- </ul></li>
- <li><a id="toc-pulse" href="#pulse">26.16 pulse</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-109" href="#Options-109">26.16.1 Options</a></li>
- <li><a id="toc-Examples-37" href="#Examples-37">26.16.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-sndio" href="#sndio">26.17 sndio</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-110" href="#Options-110">26.17.1 Options</a></li>
- </ul></li>
- <li><a id="toc-video4linux2_002c-v4l2" href="#video4linux2_002c-v4l2">26.18 video4linux2, v4l2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-111" href="#Options-111">26.18.1 Options</a></li>
- </ul></li>
- <li><a id="toc-vfwcap" href="#vfwcap">26.19 vfwcap</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-112" href="#Options-112">26.19.1 Options</a></li>
- </ul></li>
- <li><a id="toc-x11grab" href="#x11grab">26.20 x11grab</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-113" href="#Options-113">26.20.1 Options</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Output-Devices" href="#Output-Devices">27 Output Devices</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-alsa-1" href="#alsa-1">27.1 alsa</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-38" href="#Examples-38">27.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-AudioToolbox" href="#AudioToolbox">27.2 AudioToolbox</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-114" href="#Options-114">27.2.1 Options</a></li>
- <li><a id="toc-Examples-39" href="#Examples-39">27.2.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-caca" href="#caca">27.3 caca</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-115" href="#Options-115">27.3.1 Options</a></li>
- <li><a id="toc-Examples-40" href="#Examples-40">27.3.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-decklink-1" href="#decklink-1">27.4 decklink</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-116" href="#Options-116">27.4.1 Options</a></li>
- <li><a id="toc-Examples-41" href="#Examples-41">27.4.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-fbdev-1" href="#fbdev-1">27.5 fbdev</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-117" href="#Options-117">27.5.1 Options</a></li>
- <li><a id="toc-Examples-42" href="#Examples-42">27.5.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-oss-1" href="#oss-1">27.6 oss</a></li>
- <li><a id="toc-pulse-1" href="#pulse-1">27.7 pulse</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-118" href="#Options-118">27.7.1 Options</a></li>
- <li><a id="toc-Examples-43" href="#Examples-43">27.7.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-sndio-1" href="#sndio-1">27.8 sndio</a></li>
- <li><a id="toc-v4l2" href="#v4l2">27.9 v4l2</a></li>
- <li><a id="toc-xv" href="#xv">27.10 xv</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-119" href="#Options-119">27.10.1 Options</a></li>
- <li><a id="toc-Examples-44" href="#Examples-44">27.10.2 Examples</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Resampler-Options" href="#Resampler-Options">28 Resampler Options</a></li>
- <li><a id="toc-Scaler-Options" href="#Scaler-Options">29 Scaler Options</a></li>
- <li><a id="toc-Filtering-Introduction" href="#Filtering-Introduction">30 Filtering Introduction</a></li>
- <li><a id="toc-graph2dot" href="#graph2dot">31 graph2dot</a></li>
- <li><a id="toc-Filtergraph-description" href="#Filtergraph-description">32 Filtergraph description</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Filtergraph-syntax-1" href="#Filtergraph-syntax-1">32.1 Filtergraph syntax</a></li>
- <li><a id="toc-Notes-on-filtergraph-escaping" href="#Notes-on-filtergraph-escaping">32.2 Notes on filtergraph escaping</a></li>
- </ul></li>
- <li><a id="toc-Timeline-editing" href="#Timeline-editing">33 Timeline editing</a></li>
- <li><a id="toc-Changing-options-at-runtime-with-a-command" href="#Changing-options-at-runtime-with-a-command">34 Changing options at runtime with a command</a></li>
- <li><a id="toc-Options-for-filters-with-several-inputs-_0028framesync_0029" href="#Options-for-filters-with-several-inputs-_0028framesync_0029">35 Options for filters with several inputs (framesync)</a></li>
- <li><a id="toc-Audio-Filters" href="#Audio-Filters">36 Audio Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-aap" href="#aap">36.1 aap</a></li>
- <li><a id="toc-acompressor" href="#acompressor">36.2 acompressor</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands" href="#Commands">36.2.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-acontrast" href="#acontrast">36.3 acontrast</a></li>
- <li><a id="toc-acopy" href="#acopy">36.4 acopy</a></li>
- <li><a id="toc-acrossfade" href="#acrossfade">36.5 acrossfade</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-45" href="#Examples-45">36.5.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-acrossover" href="#acrossover">36.6 acrossover</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-46" href="#Examples-46">36.6.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-acrusher" href="#acrusher">36.7 acrusher</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-1" href="#Commands-1">36.7.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-acue" href="#acue">36.8 acue</a></li>
- <li><a id="toc-adeclick" href="#adeclick">36.9 adeclick</a></li>
- <li><a id="toc-adeclip" href="#adeclip">36.10 adeclip</a></li>
- <li><a id="toc-adecorrelate" href="#adecorrelate">36.11 adecorrelate</a></li>
- <li><a id="toc-adelay" href="#adelay">36.12 adelay</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-47" href="#Examples-47">36.12.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-adenorm" href="#adenorm">36.13 adenorm</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-2" href="#Commands-2">36.13.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-aderivative_002c-aintegral" href="#aderivative_002c-aintegral">36.14 aderivative, aintegral</a></li>
- <li><a id="toc-adrc" href="#adrc">36.15 adrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-3" href="#Commands-3">36.15.1 Commands</a></li>
- <li><a id="toc-Examples-48" href="#Examples-48">36.15.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-adynamicequalizer" href="#adynamicequalizer">36.16 adynamicequalizer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-4" href="#Commands-4">36.16.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-adynamicsmooth" href="#adynamicsmooth">36.17 adynamicsmooth</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-5" href="#Commands-5">36.17.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-aecho" href="#aecho">36.18 aecho</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-49" href="#Examples-49">36.18.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-aemphasis" href="#aemphasis">36.19 aemphasis</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-6" href="#Commands-6">36.19.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-aeval" href="#aeval">36.20 aeval</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-50" href="#Examples-50">36.20.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-aexciter" href="#aexciter">36.21 aexciter</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-7" href="#Commands-7">36.21.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-afade-1" href="#afade-1">36.22 afade</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-8" href="#Commands-8">36.22.1 Commands</a></li>
- <li><a id="toc-Examples-51" href="#Examples-51">36.22.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-afftdn" href="#afftdn">36.23 afftdn</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-9" href="#Commands-9">36.23.1 Commands</a></li>
- <li><a id="toc-Examples-52" href="#Examples-52">36.23.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-afftfilt" href="#afftfilt">36.24 afftfilt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-53" href="#Examples-53">36.24.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-afir-1" href="#afir-1">36.25 afir</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-54" href="#Examples-54">36.25.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-aformat-1" href="#aformat-1">36.26 aformat</a></li>
- <li><a id="toc-afreqshift" href="#afreqshift">36.27 afreqshift</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-10" href="#Commands-10">36.27.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-afwtdn" href="#afwtdn">36.28 afwtdn</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-11" href="#Commands-11">36.28.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-agate" href="#agate">36.29 agate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-12" href="#Commands-12">36.29.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-aiir" href="#aiir">36.30 aiir</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-55" href="#Examples-55">36.30.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-alimiter" href="#alimiter">36.31 alimiter</a></li>
- <li><a id="toc-allpass" href="#allpass">36.32 allpass</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-13" href="#Commands-13">36.32.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-aloop" href="#aloop">36.33 aloop</a></li>
- <li><a id="toc-amerge-1" href="#amerge-1">36.34 amerge</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-56" href="#Examples-56">36.34.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-amix" href="#amix">36.35 amix</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-57" href="#Examples-57">36.35.1 Examples</a></li>
- <li><a id="toc-Commands-14" href="#Commands-14">36.35.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-amultiply" href="#amultiply">36.36 amultiply</a></li>
- <li><a id="toc-anequalizer" href="#anequalizer">36.37 anequalizer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-58" href="#Examples-58">36.37.1 Examples</a></li>
- <li><a id="toc-Commands-15" href="#Commands-15">36.37.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-anlmdn" href="#anlmdn">36.38 anlmdn</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-16" href="#Commands-16">36.38.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-anlmf_002c-anlms" href="#anlmf_002c-anlms">36.39 anlmf, anlms</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-59" href="#Examples-59">36.39.1 Examples</a></li>
- <li><a id="toc-Commands-17" href="#Commands-17">36.39.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-anull" href="#anull">36.40 anull</a></li>
- <li><a id="toc-apad" href="#apad">36.41 apad</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-60" href="#Examples-60">36.41.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-aphaser" href="#aphaser">36.42 aphaser</a></li>
- <li><a id="toc-aphaseshift" href="#aphaseshift">36.43 aphaseshift</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-18" href="#Commands-18">36.43.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-apsnr" href="#apsnr">36.44 apsnr</a></li>
- <li><a id="toc-apsyclip" href="#apsyclip">36.45 apsyclip</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-19" href="#Commands-19">36.45.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-apulsator" href="#apulsator">36.46 apulsator</a></li>
- <li><a id="toc-aresample-1" href="#aresample-1">36.47 aresample</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-61" href="#Examples-61">36.47.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-areverse" href="#areverse">36.48 areverse</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-62" href="#Examples-62">36.48.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-arls" href="#arls">36.49 arls</a></li>
- <li><a id="toc-arnndn" href="#arnndn">36.50 arnndn</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-20" href="#Commands-20">36.50.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-asdr" href="#asdr">36.51 asdr</a></li>
- <li><a id="toc-asetnsamples" href="#asetnsamples">36.52 asetnsamples</a></li>
- <li><a id="toc-asetrate" href="#asetrate">36.53 asetrate</a></li>
- <li><a id="toc-ashowinfo" href="#ashowinfo">36.54 ashowinfo</a></li>
- <li><a id="toc-asisdr" href="#asisdr">36.55 asisdr</a></li>
- <li><a id="toc-asoftclip" href="#asoftclip">36.56 asoftclip</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-21" href="#Commands-21">36.56.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-aspectralstats" href="#aspectralstats">36.57 aspectralstats</a></li>
- <li><a id="toc-asr" href="#asr">36.58 asr</a></li>
- <li><a id="toc-astats-1" href="#astats-1">36.59 astats</a></li>
- <li><a id="toc-asubboost" href="#asubboost">36.60 asubboost</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-22" href="#Commands-22">36.60.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-asubcut" href="#asubcut">36.61 asubcut</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-23" href="#Commands-23">36.61.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-asupercut" href="#asupercut">36.62 asupercut</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-24" href="#Commands-24">36.62.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-asuperpass" href="#asuperpass">36.63 asuperpass</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-25" href="#Commands-25">36.63.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-asuperstop" href="#asuperstop">36.64 asuperstop</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-26" href="#Commands-26">36.64.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-atempo" href="#atempo">36.65 atempo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-63" href="#Examples-63">36.65.1 Examples</a></li>
- <li><a id="toc-Commands-27" href="#Commands-27">36.65.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-atilt" href="#atilt">36.66 atilt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-28" href="#Commands-28">36.66.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-atrim" href="#atrim">36.67 atrim</a></li>
- <li><a id="toc-axcorrelate" href="#axcorrelate">36.68 axcorrelate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-64" href="#Examples-64">36.68.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-bandpass" href="#bandpass">36.69 bandpass</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-29" href="#Commands-29">36.69.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-bandreject" href="#bandreject">36.70 bandreject</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-30" href="#Commands-30">36.70.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-bass_002c-lowshelf" href="#bass_002c-lowshelf">36.71 bass, lowshelf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-31" href="#Commands-31">36.71.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-biquad" href="#biquad">36.72 biquad</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-32" href="#Commands-32">36.72.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-bs2b" href="#bs2b">36.73 bs2b</a></li>
- <li><a id="toc-channelmap" href="#channelmap">36.74 channelmap</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-65" href="#Examples-65">36.74.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-channelsplit" href="#channelsplit">36.75 channelsplit</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-66" href="#Examples-66">36.75.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-chorus" href="#chorus">36.76 chorus</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-67" href="#Examples-67">36.76.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-compand" href="#compand">36.77 compand</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-68" href="#Examples-68">36.77.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-compensationdelay" href="#compensationdelay">36.78 compensationdelay</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-33" href="#Commands-33">36.78.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-crossfeed" href="#crossfeed">36.79 crossfeed</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-34" href="#Commands-34">36.79.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-crystalizer" href="#crystalizer">36.80 crystalizer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-35" href="#Commands-35">36.80.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-dcshift" href="#dcshift">36.81 dcshift</a></li>
- <li><a id="toc-deesser" href="#deesser">36.82 deesser</a></li>
- <li><a id="toc-dialoguenhance" href="#dialoguenhance">36.83 dialoguenhance</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-36" href="#Commands-36">36.83.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-drmeter" href="#drmeter">36.84 drmeter</a></li>
- <li><a id="toc-dynaudnorm" href="#dynaudnorm">36.85 dynaudnorm</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-37" href="#Commands-37">36.85.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-earwax" href="#earwax">36.86 earwax</a></li>
- <li><a id="toc-equalizer" href="#equalizer">36.87 equalizer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-69" href="#Examples-69">36.87.1 Examples</a></li>
- <li><a id="toc-Commands-38" href="#Commands-38">36.87.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-extrastereo" href="#extrastereo">36.88 extrastereo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-39" href="#Commands-39">36.88.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-firequalizer" href="#firequalizer">36.89 firequalizer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-70" href="#Examples-70">36.89.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-flanger" href="#flanger">36.90 flanger</a></li>
- <li><a id="toc-haas" href="#haas">36.91 haas</a></li>
- <li><a id="toc-hdcd" href="#hdcd">36.92 hdcd</a></li>
- <li><a id="toc-headphone" href="#headphone">36.93 headphone</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-71" href="#Examples-71">36.93.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-highpass" href="#highpass">36.94 highpass</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-40" href="#Commands-40">36.94.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-join" href="#join">36.95 join</a></li>
- <li><a id="toc-ladspa" href="#ladspa">36.96 ladspa</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-72" href="#Examples-72">36.96.1 Examples</a></li>
- <li><a id="toc-Commands-41" href="#Commands-41">36.96.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-loudnorm" href="#loudnorm">36.97 loudnorm</a></li>
- <li><a id="toc-lowpass" href="#lowpass">36.98 lowpass</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-73" href="#Examples-73">36.98.1 Examples</a></li>
- <li><a id="toc-Commands-42" href="#Commands-42">36.98.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-lv2" href="#lv2">36.99 lv2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-74" href="#Examples-74">36.99.1 Examples</a></li>
- <li><a id="toc-Commands-43" href="#Commands-43">36.99.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-mcompand" href="#mcompand">36.100 mcompand</a></li>
- <li><a id="toc-pan-1" href="#pan-1">36.101 pan</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Mixing-examples" href="#Mixing-examples">36.101.1 Mixing examples</a></li>
- <li><a id="toc-Remapping-examples" href="#Remapping-examples">36.101.2 Remapping examples</a></li>
- </ul></li>
- <li><a id="toc-replaygain" href="#replaygain">36.102 replaygain</a></li>
- <li><a id="toc-resample" href="#resample">36.103 resample</a></li>
- <li><a id="toc-rubberband" href="#rubberband">36.104 rubberband</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-44" href="#Commands-44">36.104.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-sidechaincompress" href="#sidechaincompress">36.105 sidechaincompress</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-45" href="#Commands-45">36.105.1 Commands</a></li>
- <li><a id="toc-Examples-75" href="#Examples-75">36.105.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-sidechaingate" href="#sidechaingate">36.106 sidechaingate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-46" href="#Commands-46">36.106.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-silencedetect" href="#silencedetect">36.107 silencedetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-76" href="#Examples-76">36.107.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-silenceremove" href="#silenceremove">36.108 silenceremove</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-77" href="#Examples-77">36.108.1 Examples</a></li>
- <li><a id="toc-Commands-47" href="#Commands-47">36.108.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-sofalizer" href="#sofalizer">36.109 sofalizer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-78" href="#Examples-78">36.109.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-speechnorm" href="#speechnorm">36.110 speechnorm</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-48" href="#Commands-48">36.110.1 Commands</a></li>
- <li><a id="toc-Examples-79" href="#Examples-79">36.110.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-stereotools" href="#stereotools">36.111 stereotools</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-49" href="#Commands-49">36.111.1 Commands</a></li>
- <li><a id="toc-Examples-80" href="#Examples-80">36.111.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-stereowiden" href="#stereowiden">36.112 stereowiden</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-50" href="#Commands-50">36.112.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-superequalizer" href="#superequalizer">36.113 superequalizer</a></li>
- <li><a id="toc-surround" href="#surround">36.114 surround</a></li>
- <li><a id="toc-tiltshelf" href="#tiltshelf">36.115 tiltshelf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-51" href="#Commands-51">36.115.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-treble_002c-highshelf" href="#treble_002c-highshelf">36.116 treble, highshelf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-52" href="#Commands-52">36.116.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-tremolo" href="#tremolo">36.117 tremolo</a></li>
- <li><a id="toc-vibrato" href="#vibrato">36.118 vibrato</a></li>
- <li><a id="toc-virtualbass" href="#virtualbass">36.119 virtualbass</a></li>
- <li><a id="toc-volume" href="#volume">36.120 volume</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-53" href="#Commands-53">36.120.1 Commands</a></li>
- <li><a id="toc-Examples-81" href="#Examples-81">36.120.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-volumedetect" href="#volumedetect">36.121 volumedetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-82" href="#Examples-82">36.121.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-whisper-1" href="#whisper-1">36.122 whisper</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-83" href="#Examples-83">36.122.1 Examples</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Audio-Sources" href="#Audio-Sources">37 Audio Sources</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-abuffer" href="#abuffer">37.1 abuffer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-84" href="#Examples-84">37.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-aevalsrc" href="#aevalsrc">37.2 aevalsrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-85" href="#Examples-85">37.2.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-afdelaysrc" href="#afdelaysrc">37.3 afdelaysrc</a></li>
- <li><a id="toc-afireqsrc" href="#afireqsrc">37.4 afireqsrc</a></li>
- <li><a id="toc-afirsrc" href="#afirsrc">37.5 afirsrc</a></li>
- <li><a id="toc-anullsrc" href="#anullsrc">37.6 anullsrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-86" href="#Examples-86">37.6.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-flite" href="#flite">37.7 flite</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-87" href="#Examples-87">37.7.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-anoisesrc" href="#anoisesrc">37.8 anoisesrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-88" href="#Examples-88">37.8.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-hilbert" href="#hilbert">37.9 hilbert</a></li>
- <li><a id="toc-sinc" href="#sinc">37.10 sinc</a></li>
- <li><a id="toc-sine" href="#sine">37.11 sine</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-89" href="#Examples-89">37.11.1 Examples</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Audio-Sinks" href="#Audio-Sinks">38 Audio Sinks</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-abuffersink" href="#abuffersink">38.1 abuffersink</a></li>
- <li><a id="toc-anullsink" href="#anullsink">38.2 anullsink</a></li>
- </ul></li>
- <li><a id="toc-Video-Filters" href="#Video-Filters">39 Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-addroi" href="#addroi">39.1 addroi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-90" href="#Examples-90">39.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-alphaextract" href="#alphaextract">39.2 alphaextract</a></li>
- <li><a id="toc-alphamerge" href="#alphamerge">39.3 alphamerge</a></li>
- <li><a id="toc-amplify" href="#amplify">39.4 amplify</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-54" href="#Commands-54">39.4.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-ass-1" href="#ass-1">39.5 ass</a></li>
- <li><a id="toc-atadenoise" href="#atadenoise">39.6 atadenoise</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-55" href="#Commands-55">39.6.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-avgblur" href="#avgblur">39.7 avgblur</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-56" href="#Commands-56">39.7.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-backgroundkey" href="#backgroundkey">39.8 backgroundkey</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-57" href="#Commands-57">39.8.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-bbox" href="#bbox">39.9 bbox</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-58" href="#Commands-58">39.9.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-bilateral" href="#bilateral">39.10 bilateral</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-59" href="#Commands-59">39.10.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-bitplanenoise" href="#bitplanenoise">39.11 bitplanenoise</a></li>
- <li><a id="toc-blackdetect_002c-blackdetect_005fvulkan" href="#blackdetect_002c-blackdetect_005fvulkan">39.12 blackdetect, blackdetect_vulkan</a></li>
- <li><a id="toc-blackframe" href="#blackframe">39.13 blackframe</a></li>
- <li><a id="toc-blend-1" href="#blend-1">39.14 blend</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-91" href="#Examples-91">39.14.1 Examples</a></li>
- <li><a id="toc-Commands-60" href="#Commands-60">39.14.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-blockdetect-1" href="#blockdetect-1">39.15 blockdetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-92" href="#Examples-92">39.15.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-blurdetect-1" href="#blurdetect-1">39.16 blurdetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-93" href="#Examples-93">39.16.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-bm3d" href="#bm3d">39.17 bm3d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-94" href="#Examples-94">39.17.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-boxblur" href="#boxblur">39.18 boxblur</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-95" href="#Examples-95">39.18.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-bwdif-1" href="#bwdif-1">39.19 bwdif</a></li>
- <li><a id="toc-ccrepack" href="#ccrepack">39.20 ccrepack</a></li>
- <li><a id="toc-cas" href="#cas">39.21 cas</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-61" href="#Commands-61">39.21.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-chromahold" href="#chromahold">39.22 chromahold</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-62" href="#Commands-62">39.22.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-chromakey-1" href="#chromakey-1">39.23 chromakey</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-63" href="#Commands-63">39.23.1 Commands</a></li>
- <li><a id="toc-Examples-96" href="#Examples-96">39.23.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-chromanr" href="#chromanr">39.24 chromanr</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-64" href="#Commands-64">39.24.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-chromashift" href="#chromashift">39.25 chromashift</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-65" href="#Commands-65">39.25.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-ciescope" href="#ciescope">39.26 ciescope</a></li>
- <li><a id="toc-codecview" href="#codecview">39.27 codecview</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-97" href="#Examples-97">39.27.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-colorbalance" href="#colorbalance">39.28 colorbalance</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-98" href="#Examples-98">39.28.1 Examples</a></li>
- <li><a id="toc-Commands-66" href="#Commands-66">39.28.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-colorcontrast" href="#colorcontrast">39.29 colorcontrast</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-67" href="#Commands-67">39.29.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-colorcorrect" href="#colorcorrect">39.30 colorcorrect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-68" href="#Commands-68">39.30.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-colorchannelmixer" href="#colorchannelmixer">39.31 colorchannelmixer</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-99" href="#Examples-99">39.31.1 Examples</a></li>
- <li><a id="toc-Commands-69" href="#Commands-69">39.31.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-colordetect" href="#colordetect">39.32 colordetect</a></li>
- <li><a id="toc-colorize" href="#colorize">39.33 colorize</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-70" href="#Commands-70">39.33.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-colorkey" href="#colorkey">39.34 colorkey</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-100" href="#Examples-100">39.34.1 Examples</a></li>
- <li><a id="toc-Commands-71" href="#Commands-71">39.34.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-colorhold" href="#colorhold">39.35 colorhold</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-72" href="#Commands-72">39.35.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-colorlevels" href="#colorlevels">39.36 colorlevels</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-101" href="#Examples-101">39.36.1 Examples</a></li>
- <li><a id="toc-Commands-73" href="#Commands-73">39.36.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-colormap" href="#colormap">39.37 colormap</a></li>
- <li><a id="toc-colormatrix" href="#colormatrix">39.38 colormatrix</a></li>
- <li><a id="toc-colorspace" href="#colorspace">39.39 colorspace</a></li>
- <li><a id="toc-colortemperature" href="#colortemperature">39.40 colortemperature</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-74" href="#Commands-74">39.40.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-convolution" href="#convolution">39.41 convolution</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-75" href="#Commands-75">39.41.1 Commands</a></li>
- <li><a id="toc-Examples-102" href="#Examples-102">39.41.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-convolve" href="#convolve">39.42 convolve</a></li>
- <li><a id="toc-copy" href="#copy">39.43 copy</a></li>
- <li><a id="toc-coreimage-1" href="#coreimage-1">39.44 coreimage</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-103" href="#Examples-103">39.44.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-corr" href="#corr">39.45 corr</a></li>
- <li><a id="toc-cover_005frect" href="#cover_005frect">39.46 cover_rect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-104" href="#Examples-104">39.46.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-crop" href="#crop">39.47 crop</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-105" href="#Examples-105">39.47.1 Examples</a></li>
- <li><a id="toc-Commands-76" href="#Commands-76">39.47.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-cropdetect" href="#cropdetect">39.48 cropdetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-106" href="#Examples-106">39.48.1 Examples</a></li>
- <li><a id="toc-Commands-77" href="#Commands-77">39.48.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-cue-1" href="#cue-1">39.49 cue</a></li>
- <li><a id="toc-curves-1" href="#curves-1">39.50 curves</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-78" href="#Commands-78">39.50.1 Commands</a></li>
- <li><a id="toc-Examples-107" href="#Examples-107">39.50.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-datascope" href="#datascope">39.51 datascope</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-79" href="#Commands-79">39.51.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-dblur" href="#dblur">39.52 dblur</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-80" href="#Commands-80">39.52.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-dctdnoiz" href="#dctdnoiz">39.53 dctdnoiz</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-108" href="#Examples-108">39.53.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-deband" href="#deband">39.54 deband</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-81" href="#Commands-81">39.54.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-deblock" href="#deblock">39.55 deblock</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-109" href="#Examples-109">39.55.1 Examples</a></li>
- <li><a id="toc-Commands-82" href="#Commands-82">39.55.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-decimate-1" href="#decimate-1">39.56 decimate</a></li>
- <li><a id="toc-deconvolve" href="#deconvolve">39.57 deconvolve</a></li>
- <li><a id="toc-dedot" href="#dedot">39.58 dedot</a></li>
- <li><a id="toc-deflate" href="#deflate">39.59 deflate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-83" href="#Commands-83">39.59.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-deflicker" href="#deflicker">39.60 deflicker</a></li>
- <li><a id="toc-dejudder" href="#dejudder">39.61 dejudder</a></li>
- <li><a id="toc-delogo" href="#delogo">39.62 delogo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-110" href="#Examples-110">39.62.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-derain-1" href="#derain-1">39.63 derain</a></li>
- <li><a id="toc-deshake" href="#deshake">39.64 deshake</a></li>
- <li><a id="toc-despill" href="#despill">39.65 despill</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-84" href="#Commands-84">39.65.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-detelecine" href="#detelecine">39.66 detelecine</a></li>
- <li><a id="toc-dilation-1" href="#dilation-1">39.67 dilation</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-85" href="#Commands-85">39.67.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-displace" href="#displace">39.68 displace</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-111" href="#Examples-111">39.68.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-dnn_005fclassify" href="#dnn_005fclassify">39.69 dnn_classify</a></li>
- <li><a id="toc-dnn_005fdetect" href="#dnn_005fdetect">39.70 dnn_detect</a></li>
- <li><a id="toc-dnn_005fprocessing-1" href="#dnn_005fprocessing-1">39.71 dnn_processing</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-112" href="#Examples-112">39.71.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-drawbox" href="#drawbox">39.72 drawbox</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-113" href="#Examples-113">39.72.1 Examples</a></li>
- <li><a id="toc-Commands-86" href="#Commands-86">39.72.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-drawgraph-1" href="#drawgraph-1">39.73 drawgraph</a></li>
- <li><a id="toc-drawgrid" href="#drawgrid">39.74 drawgrid</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-114" href="#Examples-114">39.74.1 Examples</a></li>
- <li><a id="toc-Commands-87" href="#Commands-87">39.74.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-drawtext-1" href="#drawtext-1">39.75 drawtext</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Syntax-2" href="#Syntax-2">39.75.1 Syntax</a></li>
- <li><a id="toc-Text-expansion" href="#Text-expansion">39.75.2 Text expansion</a></li>
- <li><a id="toc-Commands-88" href="#Commands-88">39.75.3 Commands</a></li>
- <li><a id="toc-Examples-115" href="#Examples-115">39.75.4 Examples</a></li>
- </ul></li>
- <li><a id="toc-drawvg-1" href="#drawvg-1">39.76 drawvg</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Parameters" href="#Parameters">39.76.1 Parameters</a></li>
- <li><a id="toc-Pixel-Formats" href="#Pixel-Formats">39.76.2 Pixel Formats</a></li>
- <li><a id="toc-Examples-116" href="#Examples-116">39.76.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-edgedetect" href="#edgedetect">39.77 edgedetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-117" href="#Examples-117">39.77.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-elbg" href="#elbg">39.78 elbg</a></li>
- <li><a id="toc-entropy" href="#entropy">39.79 entropy</a></li>
- <li><a id="toc-epx" href="#epx">39.80 epx</a></li>
- <li><a id="toc-eq" href="#eq">39.81 eq</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-89" href="#Commands-89">39.81.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-erosion-1" href="#erosion-1">39.82 erosion</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-90" href="#Commands-90">39.82.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-estdif" href="#estdif">39.83 estdif</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-91" href="#Commands-91">39.83.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-exposure" href="#exposure">39.84 exposure</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-92" href="#Commands-92">39.84.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-extractplanes" href="#extractplanes">39.85 extractplanes</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-118" href="#Examples-118">39.85.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-fade" href="#fade">39.86 fade</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-119" href="#Examples-119">39.86.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-feedback" href="#feedback">39.87 feedback</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-120" href="#Examples-120">39.87.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-fftdnoiz" href="#fftdnoiz">39.88 fftdnoiz</a></li>
- <li><a id="toc-fftfilt" href="#fftfilt">39.89 fftfilt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-121" href="#Examples-121">39.89.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-field" href="#field">39.90 field</a></li>
- <li><a id="toc-fieldhint" href="#fieldhint">39.91 fieldhint</a></li>
- <li><a id="toc-fieldmatch" href="#fieldmatch">39.92 fieldmatch</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-p_002fc_002fn_002fu_002fb-meaning-1" href="#p_002fc_002fn_002fu_002fb-meaning-1">39.92.1 p/c/n/u/b meaning</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-p_002fc_002fn" href="#p_002fc_002fn">39.92.1.1 p/c/n</a></li>
- <li><a id="toc-u_002fb" href="#u_002fb">39.92.1.2 u/b</a></li>
- </ul></li>
- <li><a id="toc-Examples-122" href="#Examples-122">39.92.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-fieldorder" href="#fieldorder">39.93 fieldorder</a></li>
- <li><a id="toc-fillborders" href="#fillborders">39.94 fillborders</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-93" href="#Commands-93">39.94.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-find_005frect" href="#find_005frect">39.95 find_rect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-123" href="#Examples-123">39.95.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-floodfill" href="#floodfill">39.96 floodfill</a></li>
- <li><a id="toc-format-1" href="#format-1">39.97 format</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-124" href="#Examples-124">39.97.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-fps-1" href="#fps-1">39.98 fps</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-125" href="#Examples-125">39.98.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-framepack" href="#framepack">39.99 framepack</a></li>
- <li><a id="toc-framerate" href="#framerate">39.100 framerate</a></li>
- <li><a id="toc-framestep" href="#framestep">39.101 framestep</a></li>
- <li><a id="toc-freezedetect" href="#freezedetect">39.102 freezedetect</a></li>
- <li><a id="toc-freezeframes" href="#freezeframes">39.103 freezeframes</a></li>
- <li><a id="toc-frei0r-1" href="#frei0r-1">39.104 frei0r</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-126" href="#Examples-126">39.104.1 Examples</a></li>
- <li><a id="toc-Commands-94" href="#Commands-94">39.104.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-fspp" href="#fspp">39.105 fspp</a></li>
- <li><a id="toc-fsync-1" href="#fsync-1">39.106 fsync</a></li>
- <li><a id="toc-gblur" href="#gblur">39.107 gblur</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-95" href="#Commands-95">39.107.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-geq" href="#geq">39.108 geq</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-127" href="#Examples-127">39.108.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-gradfun" href="#gradfun">39.109 gradfun</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-128" href="#Examples-128">39.109.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-graphmonitor-1" href="#graphmonitor-1">39.110 graphmonitor</a></li>
- <li><a id="toc-grayworld" href="#grayworld">39.111 grayworld</a></li>
- <li><a id="toc-greyedge" href="#greyedge">39.112 greyedge</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-129" href="#Examples-129">39.112.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-guided" href="#guided">39.113 guided</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-96" href="#Commands-96">39.113.1 Commands</a></li>
- <li><a id="toc-Examples-130" href="#Examples-130">39.113.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-haldclut-1" href="#haldclut-1">39.114 haldclut</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-97" href="#Commands-97">39.114.1 Commands</a></li>
- <li><a id="toc-Workflow-examples" href="#Workflow-examples">39.114.2 Workflow examples</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Hald-CLUT-video-stream" href="#Hald-CLUT-video-stream">39.114.2.1 Hald CLUT video stream</a></li>
- <li><a id="toc-Hald-CLUT-with-preview" href="#Hald-CLUT-with-preview">39.114.2.2 Hald CLUT with preview</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-hflip" href="#hflip">39.115 hflip</a></li>
- <li><a id="toc-histeq" href="#histeq">39.116 histeq</a></li>
- <li><a id="toc-histogram-1" href="#histogram-1">39.117 histogram</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-131" href="#Examples-131">39.117.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-hqdn3d-1" href="#hqdn3d-1">39.118 hqdn3d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-98" href="#Commands-98">39.118.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-hwdownload-1" href="#hwdownload-1">39.119 hwdownload</a></li>
- <li><a id="toc-hwmap" href="#hwmap">39.120 hwmap</a></li>
- <li><a id="toc-hwupload-1" href="#hwupload-1">39.121 hwupload</a></li>
- <li><a id="toc-hwupload_005fcuda-1" href="#hwupload_005fcuda-1">39.122 hwupload_cuda</a></li>
- <li><a id="toc-hqx" href="#hqx">39.123 hqx</a></li>
- <li><a id="toc-hstack-1" href="#hstack-1">39.124 hstack</a></li>
- <li><a id="toc-hsvhold" href="#hsvhold">39.125 hsvhold</a></li>
- <li><a id="toc-hsvkey" href="#hsvkey">39.126 hsvkey</a></li>
- <li><a id="toc-hue" href="#hue">39.127 hue</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-132" href="#Examples-132">39.127.1 Examples</a></li>
- <li><a id="toc-Commands-99" href="#Commands-99">39.127.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-huesaturation" href="#huesaturation">39.128 huesaturation</a></li>
- <li><a id="toc-hysteresis" href="#hysteresis">39.129 hysteresis</a></li>
- <li><a id="toc-iccdetect" href="#iccdetect">39.130 iccdetect</a></li>
- <li><a id="toc-iccgen" href="#iccgen">39.131 iccgen</a></li>
- <li><a id="toc-identity" href="#identity">39.132 identity</a></li>
- <li><a id="toc-idet" href="#idet">39.133 idet</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-133" href="#Examples-133">39.133.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-il" href="#il">39.134 il</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-100" href="#Commands-100">39.134.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-inflate" href="#inflate">39.135 inflate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-101" href="#Commands-101">39.135.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-interlace_002c-interlace_005fvulkan" href="#interlace_002c-interlace_005fvulkan">39.136 interlace, interlace_vulkan</a></li>
- <li><a id="toc-kerndeint" href="#kerndeint">39.137 kerndeint</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-134" href="#Examples-134">39.137.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-kirsch" href="#kirsch">39.138 kirsch</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-102" href="#Commands-102">39.138.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-lagfun" href="#lagfun">39.139 lagfun</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-103" href="#Commands-103">39.139.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-lenscorrection" href="#lenscorrection">39.140 lenscorrection</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-120" href="#Options-120">39.140.1 Options</a></li>
- <li><a id="toc-Commands-104" href="#Commands-104">39.140.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-lensfun" href="#lensfun">39.141 lensfun</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-135" href="#Examples-135">39.141.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-lcevc" href="#lcevc">39.142 lcevc</a></li>
- <li><a id="toc-libplacebo" href="#libplacebo">39.143 libplacebo</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-121" href="#Options-121">39.143.1 Options</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Output-mode" href="#Output-mode">39.143.1.1 Output mode</a></li>
- <li><a id="toc-Scaling" href="#Scaling">39.143.1.2 Scaling</a></li>
- <li><a id="toc-Deinterlacing" href="#Deinterlacing">39.143.1.3 Deinterlacing</a></li>
- <li><a id="toc-Debanding" href="#Debanding">39.143.1.4 Debanding</a></li>
- <li><a id="toc-Color-adjustment" href="#Color-adjustment">39.143.1.5 Color adjustment</a></li>
- <li><a id="toc-Peak-detection" href="#Peak-detection">39.143.1.6 Peak detection</a></li>
- <li><a id="toc-Tone-mapping" href="#Tone-mapping">39.143.1.7 Tone mapping</a></li>
- <li><a id="toc-Dithering" href="#Dithering">39.143.1.8 Dithering</a></li>
- <li><a id="toc-Custom-shaders" href="#Custom-shaders">39.143.1.9 Custom shaders</a></li>
- <li><a id="toc-Debugging-_002f-performance" href="#Debugging-_002f-performance">39.143.1.10 Debugging / performance</a></li>
- </ul></li>
- <li><a id="toc-Commands-105" href="#Commands-105">39.143.2 Commands</a></li>
- <li><a id="toc-Examples-136" href="#Examples-136">39.143.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-libvmaf-1" href="#libvmaf-1">39.144 libvmaf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-137" href="#Examples-137">39.144.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-libvmaf_005fcuda" href="#libvmaf_005fcuda">39.145 libvmaf_cuda</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-138" href="#Examples-138">39.145.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-limitdiff" href="#limitdiff">39.146 limitdiff</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-106" href="#Commands-106">39.146.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-limiter" href="#limiter">39.147 limiter</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-107" href="#Commands-107">39.147.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-loop" href="#loop">39.148 loop</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-139" href="#Examples-139">39.148.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-lut1d" href="#lut1d">39.149 lut1d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-108" href="#Commands-108">39.149.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-lut3d-1" href="#lut3d-1">39.150 lut3d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-109" href="#Commands-109">39.150.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-lumakey" href="#lumakey">39.151 lumakey</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-110" href="#Commands-110">39.151.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-lut_002c-lutrgb_002c-lutyuv" href="#lut_002c-lutrgb_002c-lutyuv">39.152 lut, lutrgb, lutyuv</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-111" href="#Commands-111">39.152.1 Commands</a></li>
- <li><a id="toc-Examples-140" href="#Examples-140">39.152.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-lut2_002c-tlut2" href="#lut2_002c-tlut2">39.153 lut2, tlut2</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-112" href="#Commands-112">39.153.1 Commands</a></li>
- <li><a id="toc-Examples-141" href="#Examples-141">39.153.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-maskedclamp" href="#maskedclamp">39.154 maskedclamp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-113" href="#Commands-113">39.154.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-maskedmax" href="#maskedmax">39.155 maskedmax</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-114" href="#Commands-114">39.155.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-maskedmerge" href="#maskedmerge">39.156 maskedmerge</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-115" href="#Commands-115">39.156.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-maskedmin" href="#maskedmin">39.157 maskedmin</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-116" href="#Commands-116">39.157.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-maskedthreshold" href="#maskedthreshold">39.158 maskedthreshold</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-117" href="#Commands-117">39.158.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-maskfun" href="#maskfun">39.159 maskfun</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-118" href="#Commands-118">39.159.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-mcdeint" href="#mcdeint">39.160 mcdeint</a></li>
- <li><a id="toc-median" href="#median">39.161 median</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-119" href="#Commands-119">39.161.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-mergeplanes" href="#mergeplanes">39.162 mergeplanes</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-142" href="#Examples-142">39.162.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-mestimate" href="#mestimate">39.163 mestimate</a></li>
- <li><a id="toc-midequalizer" href="#midequalizer">39.164 midequalizer</a></li>
- <li><a id="toc-minterpolate" href="#minterpolate">39.165 minterpolate</a></li>
- <li><a id="toc-mix" href="#mix">39.166 mix</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-120" href="#Commands-120">39.166.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-monochrome" href="#monochrome">39.167 monochrome</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-121" href="#Commands-121">39.167.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-morpho" href="#morpho">39.168 morpho</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-122" href="#Commands-122">39.168.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-mpdecimate" href="#mpdecimate">39.169 mpdecimate</a></li>
- <li><a id="toc-msad" href="#msad">39.170 msad</a></li>
- <li><a id="toc-multiply" href="#multiply">39.171 multiply</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-123" href="#Commands-123">39.171.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-negate" href="#negate">39.172 negate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-124" href="#Commands-124">39.172.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-nlmeans-1" href="#nlmeans-1">39.173 nlmeans</a></li>
- <li><a id="toc-nnedi" href="#nnedi">39.174 nnedi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-125" href="#Commands-125">39.174.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-noformat" href="#noformat">39.175 noformat</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-143" href="#Examples-143">39.175.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-noise-1" href="#noise-1">39.176 noise</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-144" href="#Examples-144">39.176.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-normalize" href="#normalize">39.177 normalize</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-126" href="#Commands-126">39.177.1 Commands</a></li>
- <li><a id="toc-Examples-145" href="#Examples-145">39.177.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-null-2" href="#null-2">39.178 null</a></li>
- <li><a id="toc-ocr" href="#ocr">39.179 ocr</a></li>
- <li><a id="toc-ocv" href="#ocv">39.180 ocv</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-dilate-1" href="#dilate-1">39.180.1 dilate</a></li>
- <li><a id="toc-erode" href="#erode">39.180.2 erode</a></li>
- <li><a id="toc-smooth" href="#smooth">39.180.3 smooth</a></li>
- </ul></li>
- <li><a id="toc-oscilloscope" href="#oscilloscope">39.181 oscilloscope</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-127" href="#Commands-127">39.181.1 Commands</a></li>
- <li><a id="toc-Examples-146" href="#Examples-146">39.181.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-overlay-1" href="#overlay-1">39.182 overlay</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-128" href="#Commands-128">39.182.1 Commands</a></li>
- <li><a id="toc-Examples-147" href="#Examples-147">39.182.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-owdenoise" href="#owdenoise">39.183 owdenoise</a></li>
- <li><a id="toc-pad-1" href="#pad-1">39.184 pad</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-148" href="#Examples-148">39.184.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-palettegen-1" href="#palettegen-1">39.185 palettegen</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-149" href="#Examples-149">39.185.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-paletteuse" href="#paletteuse">39.186 paletteuse</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-150" href="#Examples-150">39.186.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-perspective" href="#perspective">39.187 perspective</a></li>
- <li><a id="toc-phase" href="#phase">39.188 phase</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-129" href="#Commands-129">39.188.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-photosensitivity" href="#photosensitivity">39.189 photosensitivity</a></li>
- <li><a id="toc-pixdesctest" href="#pixdesctest">39.190 pixdesctest</a></li>
- <li><a id="toc-pixelize" href="#pixelize">39.191 pixelize</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-130" href="#Commands-130">39.191.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-pixscope" href="#pixscope">39.192 pixscope</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-131" href="#Commands-131">39.192.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-pp7" href="#pp7">39.193 pp7</a></li>
- <li><a id="toc-premultiply" href="#premultiply">39.194 premultiply</a></li>
- <li><a id="toc-premultiply_005fdynamic" href="#premultiply_005fdynamic">39.195 premultiply_dynamic</a></li>
- <li><a id="toc-prewitt" href="#prewitt">39.196 prewitt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-132" href="#Commands-132">39.196.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-pseudocolor" href="#pseudocolor">39.197 pseudocolor</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-133" href="#Commands-133">39.197.1 Commands</a></li>
- <li><a id="toc-Examples-151" href="#Examples-151">39.197.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-psnr-1" href="#psnr-1">39.198 psnr</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-152" href="#Examples-152">39.198.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-pullup-1" href="#pullup-1">39.199 pullup</a></li>
- <li><a id="toc-qp" href="#qp">39.200 qp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-153" href="#Examples-153">39.200.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-qrencode" href="#qrencode">39.201 qrencode</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-qrencode-Expressions" href="#qrencode-Expressions">39.201.1 qrencode Expressions</a></li>
- <li><a id="toc-qrencode-Text-expansion" href="#qrencode-Text-expansion">39.201.2 qrencode Text expansion</a></li>
- <li><a id="toc-Examples-154" href="#Examples-154">39.201.3 Examples</a></li>
- </ul></li>
- <li><a id="toc-quirc" href="#quirc">39.202 quirc</a></li>
- <li><a id="toc-random" href="#random">39.203 random</a></li>
- <li><a id="toc-readeia608" href="#readeia608">39.204 readeia608</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-134" href="#Commands-134">39.204.1 Commands</a></li>
- <li><a id="toc-Examples-155" href="#Examples-155">39.204.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-readvitc" href="#readvitc">39.205 readvitc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-156" href="#Examples-156">39.205.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-remap" href="#remap">39.206 remap</a></li>
- <li><a id="toc-removegrain" href="#removegrain">39.207 removegrain</a></li>
- <li><a id="toc-removelogo" href="#removelogo">39.208 removelogo</a></li>
- <li><a id="toc-repeatfields" href="#repeatfields">39.209 repeatfields</a></li>
- <li><a id="toc-reverse" href="#reverse">39.210 reverse</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-157" href="#Examples-157">39.210.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-rgbashift" href="#rgbashift">39.211 rgbashift</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-135" href="#Commands-135">39.211.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-roberts" href="#roberts">39.212 roberts</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-136" href="#Commands-136">39.212.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-rotate" href="#rotate">39.213 rotate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-158" href="#Examples-158">39.213.1 Examples</a></li>
- <li><a id="toc-Commands-137" href="#Commands-137">39.213.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-sab" href="#sab">39.214 sab</a></li>
- <li><a id="toc-scale-1" href="#scale-1">39.215 scale</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-122" href="#Options-122">39.215.1 Options</a></li>
- <li><a id="toc-Examples-159" href="#Examples-159">39.215.2 Examples</a></li>
- <li><a id="toc-Commands-138" href="#Commands-138">39.215.3 Commands</a></li>
- </ul></li>
- <li><a id="toc-scharr" href="#scharr">39.216 scharr</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-139" href="#Commands-139">39.216.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-scroll" href="#scroll">39.217 scroll</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-140" href="#Commands-140">39.217.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-scdet-1" href="#scdet-1">39.218 scdet</a></li>
- <li><a id="toc-selectivecolor-1" href="#selectivecolor-1">39.219 selectivecolor</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-160" href="#Examples-160">39.219.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-separatefields-1" href="#separatefields-1">39.220 separatefields</a></li>
- <li><a id="toc-setdar_002c-setsar" href="#setdar_002c-setsar">39.221 setdar, setsar</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-161" href="#Examples-161">39.221.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-setfield-1" href="#setfield-1">39.222 setfield</a></li>
- <li><a id="toc-setparams-1" href="#setparams-1">39.223 setparams</a></li>
- <li><a id="toc-shear" href="#shear">39.224 shear</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-141" href="#Commands-141">39.224.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-showinfo-1" href="#showinfo-1">39.225 showinfo</a></li>
- <li><a id="toc-showpalette" href="#showpalette">39.226 showpalette</a></li>
- <li><a id="toc-shuffleframes" href="#shuffleframes">39.227 shuffleframes</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-162" href="#Examples-162">39.227.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-shufflepixels" href="#shufflepixels">39.228 shufflepixels</a></li>
- <li><a id="toc-shuffleplanes" href="#shuffleplanes">39.229 shuffleplanes</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-163" href="#Examples-163">39.229.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-signalstats-1" href="#signalstats-1">39.230 signalstats</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-164" href="#Examples-164">39.230.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-signature-1" href="#signature-1">39.231 signature</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-165" href="#Examples-165">39.231.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-siti-1" href="#siti-1">39.232 siti</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-166" href="#Examples-166">39.232.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-smartblur-1" href="#smartblur-1">39.233 smartblur</a></li>
- <li><a id="toc-sobel" href="#sobel">39.234 sobel</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-142" href="#Commands-142">39.234.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-spp-1" href="#spp-1">39.235 spp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-143" href="#Commands-143">39.235.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-sr-1" href="#sr-1">39.236 sr</a></li>
- <li><a id="toc-sr_005famf-1" href="#sr_005famf-1">39.237 sr_amf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-167" href="#Examples-167">39.237.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-ssim" href="#ssim">39.238 ssim</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-168" href="#Examples-168">39.238.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-stereo3d" href="#stereo3d">39.239 stereo3d</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-169" href="#Examples-169">39.239.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-streamselect_002c-astreamselect" href="#streamselect_002c-astreamselect">39.240 streamselect, astreamselect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-144" href="#Commands-144">39.240.1 Commands</a></li>
- <li><a id="toc-Examples-170" href="#Examples-170">39.240.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-subtitles-1" href="#subtitles-1">39.241 subtitles</a></li>
- <li><a id="toc-super2xsai" href="#super2xsai">39.242 super2xsai</a></li>
- <li><a id="toc-swaprect" href="#swaprect">39.243 swaprect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-145" href="#Commands-145">39.243.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-swapuv" href="#swapuv">39.244 swapuv</a></li>
- <li><a id="toc-tblend" href="#tblend">39.245 tblend</a></li>
- <li><a id="toc-telecine" href="#telecine">39.246 telecine</a></li>
- <li><a id="toc-thistogram" href="#thistogram">39.247 thistogram</a></li>
- <li><a id="toc-threshold" href="#threshold">39.248 threshold</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-146" href="#Commands-146">39.248.1 Commands</a></li>
- <li><a id="toc-Examples-171" href="#Examples-171">39.248.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-thumbnail" href="#thumbnail">39.249 thumbnail</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-172" href="#Examples-172">39.249.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-tile-1" href="#tile-1">39.250 tile</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-173" href="#Examples-173">39.250.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-tiltandshift" href="#tiltandshift">39.251 tiltandshift</a></li>
- <li><a id="toc-tinterlace" href="#tinterlace">39.252 tinterlace</a></li>
- <li><a id="toc-tmedian" href="#tmedian">39.253 tmedian</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-147" href="#Commands-147">39.253.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-tmidequalizer" href="#tmidequalizer">39.254 tmidequalizer</a></li>
- <li><a id="toc-tmix" href="#tmix">39.255 tmix</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-174" href="#Examples-174">39.255.1 Examples</a></li>
- <li><a id="toc-Commands-148" href="#Commands-148">39.255.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-tonemap-1" href="#tonemap-1">39.256 tonemap</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-123" href="#Options-123">39.256.1 Options</a></li>
- </ul></li>
- <li><a id="toc-tpad" href="#tpad">39.257 tpad</a></li>
- <li><a id="toc-transpose-1" href="#transpose-1">39.258 transpose</a></li>
- <li><a id="toc-trim" href="#trim">39.259 trim</a></li>
- <li><a id="toc-unpremultiply" href="#unpremultiply">39.260 unpremultiply</a></li>
- <li><a id="toc-unsharp-1" href="#unsharp-1">39.261 unsharp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-175" href="#Examples-175">39.261.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-untile-1" href="#untile-1">39.262 untile</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-176" href="#Examples-176">39.262.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-uspp" href="#uspp">39.263 uspp</a></li>
- <li><a id="toc-v360" href="#v360">39.264 v360</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-177" href="#Examples-177">39.264.1 Examples</a></li>
- <li><a id="toc-Commands-149" href="#Commands-149">39.264.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-vaguedenoiser" href="#vaguedenoiser">39.265 vaguedenoiser</a></li>
- <li><a id="toc-varblur" href="#varblur">39.266 varblur</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-150" href="#Commands-150">39.266.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-vectorscope" href="#vectorscope">39.267 vectorscope</a></li>
- <li><a id="toc-vidstabdetect-1" href="#vidstabdetect-1">39.268 vidstabdetect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-178" href="#Examples-178">39.268.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-vidstabtransform-1" href="#vidstabtransform-1">39.269 vidstabtransform</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-124" href="#Options-124">39.269.1 Options</a></li>
- <li><a id="toc-Examples-179" href="#Examples-179">39.269.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-vflip" href="#vflip">39.270 vflip</a></li>
- <li><a id="toc-vfrdet" href="#vfrdet">39.271 vfrdet</a></li>
- <li><a id="toc-vibrance" href="#vibrance">39.272 vibrance</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-151" href="#Commands-151">39.272.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-vif" href="#vif">39.273 vif</a></li>
- <li><a id="toc-vignette-1" href="#vignette-1">39.274 vignette</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Expressions" href="#Expressions">39.274.1 Expressions</a></li>
- <li><a id="toc-Examples-180" href="#Examples-180">39.274.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-vmafmotion" href="#vmafmotion">39.275 vmafmotion</a></li>
- <li><a id="toc-vpp_005famf-1" href="#vpp_005famf-1">39.276 vpp_amf</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-181" href="#Examples-181">39.276.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-vstack-1" href="#vstack-1">39.277 vstack</a></li>
- <li><a id="toc-w3fdif" href="#w3fdif">39.278 w3fdif</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-152" href="#Commands-152">39.278.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-waveform" href="#waveform">39.279 waveform</a></li>
- <li><a id="toc-weave_002c-doubleweave" href="#weave_002c-doubleweave">39.280 weave, doubleweave</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-182" href="#Examples-182">39.280.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-xbr" href="#xbr">39.281 xbr</a></li>
- <li><a id="toc-xcorrelate" href="#xcorrelate">39.282 xcorrelate</a></li>
- <li><a id="toc-xfade" href="#xfade">39.283 xfade</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-183" href="#Examples-183">39.283.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-xmedian" href="#xmedian">39.284 xmedian</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-153" href="#Commands-153">39.284.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-xpsnr-1" href="#xpsnr-1">39.285 xpsnr</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-184" href="#Examples-184">39.285.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-xstack-1" href="#xstack-1">39.286 xstack</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-185" href="#Examples-185">39.286.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-yadif-1" href="#yadif-1">39.287 yadif</a></li>
- <li><a id="toc-yaepblur" href="#yaepblur">39.288 yaepblur</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-154" href="#Commands-154">39.288.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-zoompan" href="#zoompan">39.289 zoompan</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-186" href="#Examples-186">39.289.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-zscale-1" href="#zscale-1">39.290 zscale</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-125" href="#Options-125">39.290.1 Options</a></li>
- <li><a id="toc-Commands-155" href="#Commands-155">39.290.2 Commands</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-CUDA-Video-Filters" href="#CUDA-Video-Filters">40 CUDA Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-CUDA-1" href="#CUDA-1">40.1 CUDA</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-bilateral_005fcuda" href="#bilateral_005fcuda">40.1.1 bilateral_cuda</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-187" href="#Examples-187">40.1.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-bwdif_005fcuda" href="#bwdif_005fcuda">40.1.2 bwdif_cuda</a></li>
- <li><a id="toc-chromakey_005fcuda" href="#chromakey_005fcuda">40.1.3 chromakey_cuda</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-188" href="#Examples-188">40.1.3.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-colorspace_005fcuda" href="#colorspace_005fcuda">40.1.4 colorspace_cuda</a></li>
- <li><a id="toc-overlay_005fcuda-1" href="#overlay_005fcuda-1">40.1.5 overlay_cuda</a></li>
- <li><a id="toc-pad_005fcuda-1" href="#pad_005fcuda-1">40.1.6 pad_cuda</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-189" href="#Examples-189">40.1.6.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-scale_005fcuda-1" href="#scale_005fcuda-1">40.1.7 scale_cuda</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-190" href="#Examples-190">40.1.7.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-thumbnail_005fcuda" href="#thumbnail_005fcuda">40.1.8 thumbnail_cuda</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-11" href="#Example-11">40.1.8.1 Example</a></li>
- </ul></li>
- <li><a id="toc-yadif_005fcuda" href="#yadif_005fcuda">40.1.9 yadif_cuda</a></li>
- </ul></li>
- <li><a id="toc-CUDA-NPP-1" href="#CUDA-NPP-1">40.2 CUDA NPP</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-scale_005fnpp-1" href="#scale_005fnpp-1">40.2.1 scale_npp</a></li>
- <li><a id="toc-scale2ref_005fnpp" href="#scale2ref_005fnpp">40.2.2 scale2ref_npp</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-191" href="#Examples-191">40.2.2.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-sharpen_005fnpp" href="#sharpen_005fnpp">40.2.3 sharpen_npp</a></li>
- <li><a id="toc-transpose_005fnpp" href="#transpose_005fnpp">40.2.4 transpose_npp</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-OpenCL-Video-Filters" href="#OpenCL-Video-Filters">41 OpenCL Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-avgblur_005fopencl" href="#avgblur_005fopencl">41.1 avgblur_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-12" href="#Example-12">41.1.1 Example</a></li>
- </ul></li>
- <li><a id="toc-boxblur_005fopencl" href="#boxblur_005fopencl">41.2 boxblur_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-192" href="#Examples-192">41.2.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-colorkey_005fopencl" href="#colorkey_005fopencl">41.3 colorkey_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-193" href="#Examples-193">41.3.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-convolution_005fopencl" href="#convolution_005fopencl">41.4 convolution_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-194" href="#Examples-194">41.4.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-erosion_005fopencl" href="#erosion_005fopencl">41.5 erosion_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-13" href="#Example-13">41.5.1 Example</a></li>
- </ul></li>
- <li><a id="toc-deshake_005fopencl" href="#deshake_005fopencl">41.6 deshake_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-195" href="#Examples-195">41.6.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-dilation_005fopencl" href="#dilation_005fopencl">41.7 dilation_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-14" href="#Example-14">41.7.1 Example</a></li>
- </ul></li>
- <li><a id="toc-nlmeans_005fopencl-1" href="#nlmeans_005fopencl-1">41.8 nlmeans_opencl</a></li>
- <li><a id="toc-overlay_005fopencl" href="#overlay_005fopencl">41.9 overlay_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-196" href="#Examples-196">41.9.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-pad_005fopencl" href="#pad_005fopencl">41.10 pad_opencl</a></li>
- <li><a id="toc-prewitt_005fopencl" href="#prewitt_005fopencl">41.11 prewitt_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-15" href="#Example-15">41.11.1 Example</a></li>
- </ul></li>
- <li><a id="toc-program_005fopencl-1" href="#program_005fopencl-1">41.12 program_opencl</a></li>
- <li><a id="toc-remap_005fopencl" href="#remap_005fopencl">41.13 remap_opencl</a></li>
- <li><a id="toc-roberts_005fopencl" href="#roberts_005fopencl">41.14 roberts_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-16" href="#Example-16">41.14.1 Example</a></li>
- </ul></li>
- <li><a id="toc-sobel_005fopencl" href="#sobel_005fopencl">41.15 sobel_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-17" href="#Example-17">41.15.1 Example</a></li>
- </ul></li>
- <li><a id="toc-tonemap_005fopencl" href="#tonemap_005fopencl">41.16 tonemap_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-18" href="#Example-18">41.16.1 Example</a></li>
- </ul></li>
- <li><a id="toc-unsharp_005fopencl" href="#unsharp_005fopencl">41.17 unsharp_opencl</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-197" href="#Examples-197">41.17.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-xfade_005fopencl" href="#xfade_005fopencl">41.18 xfade_opencl</a></li>
- </ul></li>
- <li><a id="toc-VAAPI-Video-Filters" href="#VAAPI-Video-Filters">42 VAAPI Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-overlay_005fvaapi" href="#overlay_005fvaapi">42.1 overlay_vaapi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-198" href="#Examples-198">42.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-tonemap_005fvaapi" href="#tonemap_005fvaapi">42.2 tonemap_vaapi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Example-19" href="#Example-19">42.2.1 Example</a></li>
- </ul></li>
- <li><a id="toc-hstack_005fvaapi" href="#hstack_005fvaapi">42.3 hstack_vaapi</a></li>
- <li><a id="toc-vstack_005fvaapi" href="#vstack_005fvaapi">42.4 vstack_vaapi</a></li>
- <li><a id="toc-xstack_005fvaapi" href="#xstack_005fvaapi">42.5 xstack_vaapi</a></li>
- <li><a id="toc-pad_005fvaapi" href="#pad_005fvaapi">42.6 pad_vaapi</a></li>
- <li><a id="toc-drawbox_005fvaapi" href="#drawbox_005fvaapi">42.7 drawbox_vaapi</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-199" href="#Examples-199">42.7.1 Examples</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-VideoToolbox-Video-Filters" href="#VideoToolbox-Video-Filters">43 VideoToolbox Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-scale_005fvt" href="#scale_005fvt">43.1 scale_vt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-200" href="#Examples-200">43.1.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-transpose_005fvt" href="#transpose_005fvt">43.2 transpose_vt</a></li>
- </ul></li>
- <li><a id="toc-Vulkan-Video-Filters" href="#Vulkan-Video-Filters">44 Vulkan Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-avgblur_005fvulkan" href="#avgblur_005fvulkan">44.1 avgblur_vulkan</a></li>
- <li><a id="toc-blend_005fvulkan" href="#blend_005fvulkan">44.2 blend_vulkan</a></li>
- <li><a id="toc-bwdif_005fvulkan" href="#bwdif_005fvulkan">44.3 bwdif_vulkan</a></li>
- <li><a id="toc-chromaber_005fvulkan" href="#chromaber_005fvulkan">44.4 chromaber_vulkan</a></li>
- <li><a id="toc-color_005fvulkan" href="#color_005fvulkan">44.5 color_vulkan</a></li>
- <li><a id="toc-vflip_005fvulkan" href="#vflip_005fvulkan">44.6 vflip_vulkan</a></li>
- <li><a id="toc-hflip_005fvulkan" href="#hflip_005fvulkan">44.7 hflip_vulkan</a></li>
- <li><a id="toc-flip_005fvulkan" href="#flip_005fvulkan">44.8 flip_vulkan</a></li>
- <li><a id="toc-gblur_005fvulkan" href="#gblur_005fvulkan">44.9 gblur_vulkan</a></li>
- <li><a id="toc-nlmeans_005fvulkan" href="#nlmeans_005fvulkan">44.10 nlmeans_vulkan</a></li>
- <li><a id="toc-overlay_005fvulkan" href="#overlay_005fvulkan">44.11 overlay_vulkan</a></li>
- <li><a id="toc-transpose_005fvulkan" href="#transpose_005fvulkan">44.12 transpose_vulkan</a></li>
- </ul></li>
- <li><a id="toc-QSV-Video-Filters" href="#QSV-Video-Filters">45 QSV Video Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-hstack_005fqsv" href="#hstack_005fqsv">45.1 hstack_qsv</a></li>
- <li><a id="toc-vstack_005fqsv" href="#vstack_005fqsv">45.2 vstack_qsv</a></li>
- <li><a id="toc-xstack_005fqsv" href="#xstack_005fqsv">45.3 xstack_qsv</a></li>
- </ul></li>
- <li><a id="toc-Video-Sources" href="#Video-Sources">46 Video Sources</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-buffer" href="#buffer">46.1 buffer</a></li>
- <li><a id="toc-cellauto" href="#cellauto">46.2 cellauto</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-201" href="#Examples-201">46.2.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-coreimagesrc-1" href="#coreimagesrc-1">46.3 coreimagesrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-202" href="#Examples-202">46.3.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-ddagrab" href="#ddagrab">46.4 ddagrab</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-203" href="#Examples-203">46.4.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-gfxcapture" href="#gfxcapture">46.5 gfxcapture</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-204" href="#Examples-204">46.5.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-gradients" href="#gradients">46.6 gradients</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-156" href="#Commands-156">46.6.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-mandelbrot" href="#mandelbrot">46.7 mandelbrot</a></li>
- <li><a id="toc-mptestsrc" href="#mptestsrc">46.8 mptestsrc</a></li>
- <li><a id="toc-frei0r_005fsrc" href="#frei0r_005fsrc">46.9 frei0r_src</a></li>
- <li><a id="toc-life" href="#life">46.10 life</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-205" href="#Examples-205">46.10.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-perlin" href="#perlin">46.11 perlin</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Options-126" href="#Options-126">46.11.1 Options</a></li>
- <li><a id="toc-Examples-206" href="#Examples-206">46.11.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-qrencodesrc" href="#qrencodesrc">46.12 qrencodesrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-207" href="#Examples-207">46.12.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-allrgb_002c-allyuv_002c-color_002c-colorchart_002c-colorspectrum_002c-haldclutsrc_002c-nullsrc_002c-pal75bars_002c-pal100bars_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" href="#allrgb_002c-allyuv_002c-color_002c-colorchart_002c-colorspectrum_002c-haldclutsrc_002c-nullsrc_002c-pal75bars_002c-pal100bars_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc">46.13 allrgb, allyuv, color, colorchart, colorspectrum, haldclutsrc, nullsrc, pal75bars, pal100bars, rgbtestsrc, smptebars, smptehdbars, testsrc, testsrc2, yuvtestsrc</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-208" href="#Examples-208">46.13.1 Examples</a></li>
- <li><a id="toc-Commands-157" href="#Commands-157">46.13.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-openclsrc" href="#openclsrc">46.14 openclsrc</a></li>
- <li><a id="toc-sierpinski" href="#sierpinski">46.15 sierpinski</a></li>
- <li><a id="toc-zoneplate" href="#zoneplate">46.16 zoneplate</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-158" href="#Commands-158">46.16.1 Commands</a></li>
- <li><a id="toc-Examples-209" href="#Examples-209">46.16.2 Examples</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Video-Sinks" href="#Video-Sinks">47 Video Sinks</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-buffersink" href="#buffersink">47.1 buffersink</a></li>
- <li><a id="toc-nullsink" href="#nullsink">47.2 nullsink</a></li>
- </ul></li>
- <li><a id="toc-Multimedia-Filters" href="#Multimedia-Filters">48 Multimedia Filters</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-a3dscope" href="#a3dscope">48.1 a3dscope</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-159" href="#Commands-159">48.1.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-abitscope" href="#abitscope">48.2 abitscope</a></li>
- <li><a id="toc-adrawgraph" href="#adrawgraph">48.3 adrawgraph</a></li>
- <li><a id="toc-agraphmonitor" href="#agraphmonitor">48.4 agraphmonitor</a></li>
- <li><a id="toc-ahistogram" href="#ahistogram">48.5 ahistogram</a></li>
- <li><a id="toc-aphasemeter" href="#aphasemeter">48.6 aphasemeter</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-phasing-detection" href="#phasing-detection">48.6.1 phasing detection</a></li>
- <li><a id="toc-Examples-210" href="#Examples-210">48.6.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-avectorscope" href="#avectorscope">48.7 avectorscope</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-211" href="#Examples-211">48.7.1 Examples</a></li>
- <li><a id="toc-Commands-160" href="#Commands-160">48.7.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-bench_002c-abench" href="#bench_002c-abench">48.8 bench, abench</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-212" href="#Examples-212">48.8.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-concat-3" href="#concat-3">48.9 concat</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-213" href="#Examples-213">48.9.1 Examples</a></li>
- <li><a id="toc-Commands-161" href="#Commands-161">48.9.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-ebur128-1" href="#ebur128-1">48.10 ebur128</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-214" href="#Examples-214">48.10.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-interleave_002c-ainterleave" href="#interleave_002c-ainterleave">48.11 interleave, ainterleave</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-215" href="#Examples-215">48.11.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-latency_002c-alatency" href="#latency_002c-alatency">48.12 latency, alatency</a></li>
- <li><a id="toc-metadata_002c-ametadata" href="#metadata_002c-ametadata">48.13 metadata, ametadata</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-216" href="#Examples-216">48.13.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-perms_002c-aperms" href="#perms_002c-aperms">48.14 perms, aperms</a></li>
- <li><a id="toc-realtime_002c-arealtime" href="#realtime_002c-arealtime">48.15 realtime, arealtime</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-162" href="#Commands-162">48.15.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-segment_002c-asegment" href="#segment_002c-asegment">48.16 segment, asegment</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-217" href="#Examples-217">48.16.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-select_002c-aselect" href="#select_002c-aselect">48.17 select, aselect</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-218" href="#Examples-218">48.17.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-sendcmd_002c-asendcmd" href="#sendcmd_002c-asendcmd">48.18 sendcmd, asendcmd</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-syntax" href="#Commands-syntax">48.18.1 Commands syntax</a></li>
- <li><a id="toc-Examples-219" href="#Examples-219">48.18.2 Examples</a></li>
- </ul></li>
- <li><a id="toc-setpts_002c-asetpts" href="#setpts_002c-asetpts">48.19 setpts, asetpts</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-220" href="#Examples-220">48.19.1 Examples</a></li>
- <li><a id="toc-Commands-163" href="#Commands-163">48.19.2 Commands</a></li>
- </ul></li>
- <li><a id="toc-setrange" href="#setrange">48.20 setrange</a></li>
- <li><a id="toc-settb_002c-asettb" href="#settb_002c-asettb">48.21 settb, asettb</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-221" href="#Examples-221">48.21.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-showcqt" href="#showcqt">48.22 showcqt</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-222" href="#Examples-222">48.22.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-showcwt" href="#showcwt">48.23 showcwt</a></li>
- <li><a id="toc-showfreqs" href="#showfreqs">48.24 showfreqs</a></li>
- <li><a id="toc-showspatial" href="#showspatial">48.25 showspatial</a></li>
- <li><a id="toc-showspectrum-1" href="#showspectrum-1">48.26 showspectrum</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-223" href="#Examples-223">48.26.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-showspectrumpic" href="#showspectrumpic">48.27 showspectrumpic</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-224" href="#Examples-224">48.27.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-showvolume" href="#showvolume">48.28 showvolume</a></li>
- <li><a id="toc-showwaves" href="#showwaves">48.29 showwaves</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-225" href="#Examples-225">48.29.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-showwavespic" href="#showwavespic">48.30 showwavespic</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-226" href="#Examples-226">48.30.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-sidedata_002c-asidedata" href="#sidedata_002c-asidedata">48.31 sidedata, asidedata</a></li>
- <li><a id="toc-spectrumsynth" href="#spectrumsynth">48.32 spectrumsynth</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-227" href="#Examples-227">48.32.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-split_002c-asplit" href="#split_002c-asplit">48.33 split, asplit</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-228" href="#Examples-228">48.33.1 Examples</a></li>
- </ul></li>
- <li><a id="toc-zmq_002c-azmq" href="#zmq_002c-azmq">48.34 zmq, azmq</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-229" href="#Examples-229">48.34.1 Examples</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-Multimedia-Sources" href="#Multimedia-Sources">49 Multimedia Sources</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-amovie" href="#amovie">49.1 amovie</a></li>
- <li><a id="toc-avsynctest" href="#avsynctest">49.2 avsynctest</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Commands-164" href="#Commands-164">49.2.1 Commands</a></li>
- </ul></li>
- <li><a id="toc-movie-1" href="#movie-1">49.3 movie</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Examples-230" href="#Examples-230">49.3.1 Examples</a></li>
- <li><a id="toc-Commands-165" href="#Commands-165">49.3.2 Commands</a></li>
- </ul></li>
- </ul></li>
- <li><a id="toc-External-libraries" href="#External-libraries">50 External libraries</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-Alliance-for-Open-Media-_0028AOM_0029" href="#Alliance-for-Open-Media-_0028AOM_0029">50.1 Alliance for Open Media (AOM)</a></li>
- <li><a id="toc-AMD-AMF_002fVCE" href="#AMD-AMF_002fVCE">50.2 AMD AMF/VCE</a></li>
- <li><a id="toc-AviSynth" href="#AviSynth">50.3 AviSynth</a></li>
- <li><a id="toc-Chromaprint" href="#Chromaprint">50.4 Chromaprint</a></li>
- <li><a id="toc-codec2-1" href="#codec2-1">50.5 codec2</a></li>
- <li><a id="toc-dav1d" href="#dav1d">50.6 dav1d</a></li>
- <li><a id="toc-davs2" href="#davs2">50.7 davs2</a></li>
- <li><a id="toc-uavs3d" href="#uavs3d">50.8 uavs3d</a></li>
- <li><a id="toc-Game-Music-Emu" href="#Game-Music-Emu">50.9 Game Music Emu</a></li>
- <li><a id="toc-Intel-QuickSync-Video" href="#Intel-QuickSync-Video">50.10 Intel QuickSync Video</a></li>
- <li><a id="toc-Kvazaar" href="#Kvazaar">50.11 Kvazaar</a></li>
- <li><a id="toc-LAME" href="#LAME">50.12 LAME</a></li>
- <li><a id="toc-LCEVCdec" href="#LCEVCdec">50.13 LCEVCdec</a></li>
- <li><a id="toc-libilbc-1" href="#libilbc-1">50.14 libilbc</a></li>
- <li><a id="toc-libjxl-1" href="#libjxl-1">50.15 libjxl</a></li>
- <li><a id="toc-libvpx-1" href="#libvpx-1">50.16 libvpx</a></li>
- <li><a id="toc-ModPlug" href="#ModPlug">50.17 ModPlug</a></li>
- <li><a id="toc-OpenCORE_002c-VisualOn_002c-and-Fraunhofer-libraries" href="#OpenCORE_002c-VisualOn_002c-and-Fraunhofer-libraries">50.18 OpenCORE, VisualOn, and Fraunhofer libraries</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-OpenCORE-AMR" href="#OpenCORE-AMR">50.18.1 OpenCORE AMR</a></li>
- <li><a id="toc-VisualOn-AMR_002dWB-encoder-library" href="#VisualOn-AMR_002dWB-encoder-library">50.18.2 VisualOn AMR-WB encoder library</a></li>
- <li><a id="toc-Fraunhofer-AAC-library" href="#Fraunhofer-AAC-library">50.18.3 Fraunhofer AAC library</a></li>
- <li><a id="toc-Fraunhofer-MPEG_002dH-3D-Audio-decoder-library" href="#Fraunhofer-MPEG_002dH-3D-Audio-decoder-library">50.18.4 Fraunhofer MPEG-H 3D Audio decoder library</a></li>
- <li><a id="toc-LC3-library" href="#LC3-library">50.18.5 LC3 library</a></li>
- </ul></li>
- <li><a id="toc-OpenH264" href="#OpenH264">50.19 OpenH264</a></li>
- <li><a id="toc-OpenJPEG" href="#OpenJPEG">50.20 OpenJPEG</a></li>
- <li><a id="toc-rav1e" href="#rav1e">50.21 rav1e</a></li>
- <li><a id="toc-SVT_002dAV1" href="#SVT_002dAV1">50.22 SVT-AV1</a></li>
- <li><a id="toc-SVT_002dJPEG_002dXS" href="#SVT_002dJPEG_002dXS">50.23 SVT-JPEG-XS</a></li>
- <li><a id="toc-TwoLAME" href="#TwoLAME">50.24 TwoLAME</a></li>
- <li><a id="toc-VapourSynth" href="#VapourSynth">50.25 VapourSynth</a></li>
- <li><a id="toc-x264" href="#x264">50.26 x264</a></li>
- <li><a id="toc-x265" href="#x265">50.27 x265</a></li>
- <li><a id="toc-xavs" href="#xavs">50.28 xavs</a></li>
- <li><a id="toc-xavs2" href="#xavs2">50.29 xavs2</a></li>
- <li><a id="toc-eXtra_002dfast-Essential-Video-Encoder-_0028XEVE_0029" href="#eXtra_002dfast-Essential-Video-Encoder-_0028XEVE_0029">50.30 eXtra-fast Essential Video Encoder (XEVE)</a></li>
- <li><a id="toc-eXtra_002dfast-Essential-Video-Decoder-_0028XEVD_0029" href="#eXtra_002dfast-Essential-Video-Decoder-_0028XEVD_0029">50.31 eXtra-fast Essential Video Decoder (XEVD)</a></li>
- <li><a id="toc-ZVBI" href="#ZVBI">50.32 ZVBI</a></li>
- </ul></li>
- <li><a id="toc-Supported-File-Formats_002c-Codecs-or-Features" href="#Supported-File-Formats_002c-Codecs-or-Features">51 Supported File Formats, Codecs or Features</a>
- <ul class="toc-numbered-mark">
- <li><a id="toc-File-Formats" href="#File-Formats">51.1 File Formats</a></li>
- <li><a id="toc-Image-Formats" href="#Image-Formats">51.2 Image Formats</a></li>
- <li><a id="toc-Video-Codecs" href="#Video-Codecs">51.3 Video Codecs</a></li>
- <li><a id="toc-Audio-Codecs" href="#Audio-Codecs">51.4 Audio Codecs</a></li>
- <li><a id="toc-Subtitle-Formats" href="#Subtitle-Formats">51.5 Subtitle Formats</a></li>
- <li><a id="toc-Network-Protocols" href="#Network-Protocols">51.6 Network Protocols</a></li>
- <li><a id="toc-Input_002fOutput-Devices" href="#Input_002fOutput-Devices">51.7 Input/Output Devices</a></li>
- <li><a id="toc-Timecode" href="#Timecode">51.8 Timecode</a></li>
- </ul></li>
- <li><a id="toc-See-Also" href="#See-Also">52 See Also</a></li>
- <li><a id="toc-Authors" href="#Authors">53 Authors</a></li>
- </ul>
- </div>
- </div>
- <a name="Synopsis"></a>
- <h2 class="chapter">1 Synopsis<span class="pull-right"><a class="anchor hidden-xs" href="#Synopsis" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Synopsis" aria-hidden="true">TOC</a></span></h2>
- <p>ffmpeg [<var class="var">global_options</var>] {[<var class="var">input_file_options</var>] -i <samp class="file">input_url</samp>} ... {[<var class="var">output_file_options</var>] <samp class="file">output_url</samp>} ...
- </p>
- <a name="Description"></a>
- <h2 class="chapter">2 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description" aria-hidden="true">TOC</a></span></h2>
- <p><code class="command">ffmpeg</code> is a universal media converter. It can read a wide variety of
- inputs - including live grabbing/recording devices - filter, and transcode them
- into a plethora of output formats.
- </p>
- <p><code class="command">ffmpeg</code> reads from an arbitrary number of inputs (which can be regular
- files, pipes, network streams, grabbing devices, etc.), specified by the
- <code class="code">-i</code> option, and writes to an arbitrary number of outputs, which are
- specified by a plain output url. Anything found on the command line which cannot
- be interpreted as an option is considered to be an output url.
- </p>
- <p>Each input or output can, in principle, contain any number of elementary streams
- of different types (video/audio/subtitle/attachment/data), though the allowed
- stream counts and/or types may be limited by the container format. Selecting
- which streams from which inputs will go into which output is either done
- automatically or with the <code class="code">-map</code> option (see the <a class="ref" href="#Stream-selection">Stream selection</a>
- chapter).
- </p>
- <p>To refer to inputs/outputs in options, you must use their indices (0-based).
- E.g. the first input is <code class="code">0</code>, the second is <code class="code">1</code>, etc. Similarly,
- streams within an input/output are referred to by their indices. E.g. <code class="code">2:3</code>
- refers to the fourth stream in the third input or output. Also see the
- <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter.
- </p>
- <p>As a general rule, options are applied to the next specified
- file. Therefore, order is important, and you can have the same
- option on the command line multiple times. Each occurrence is
- then applied to the next input or output file.
- Exceptions from this rule are the global options (e.g. verbosity level),
- which should be specified first.
- </p>
- <p>Do not mix input and output files – first specify all input files, then all
- output files. Also do not mix options which belong to different files. All
- options apply ONLY to the next input or output file and are reset between files.
- </p>
- <p>Some simple examples follow.
- </p>
- <ul class="itemize mark-bullet">
- <li>Convert an input media file to a different format, by re-encoding media streams:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.avi output.mp4
- </pre></div>
- </li><li>Set the video bitrate of the output file to 64 kbit/s:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4
- </pre></div>
- </li><li>Force the frame rate of the output file to 24 fps:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.avi -r 24 output.mp4
- </pre></div>
- </li><li>Force the frame rate of the input file (valid for raw formats only) to 1 fps and
- the frame rate of the output file to 24 fps:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -r 1 -i input.m2v -r 24 output.mp4
- </pre></div>
- </li></ul>
- <p>The format option may be needed for raw input files.
- </p>
- <a name="Detailed-description"></a>
- <h2 class="chapter">3 Detailed description<span class="pull-right"><a class="anchor hidden-xs" href="#Detailed-description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Detailed-description" aria-hidden="true">TOC</a></span></h2>
- <p><code class="command">ffmpeg</code> builds a transcoding pipeline out of the components listed
- below. The program’s operation then consists of input data chunks flowing from
- the sources down the pipes towards the sinks, while being transformed by the
- components they encounter along the way.
- </p>
- <p>The following kinds of components are available:
- </p><ul class="itemize mark-bullet">
- <li><em class="emph">Demuxers</em> (short for "demultiplexers") read an input source in order to
- extract
- <ul class="itemize mark-bullet">
- <li>global properties such as metadata or chapters;
- </li><li>list of input elementary streams and their properties
- </li></ul>
- <p>One demuxer instance is created for each <samp class="option">-i</samp> option, and sends encoded
- <em class="emph">packets</em> to <em class="emph">decoders</em> or <em class="emph">muxers</em>.
- </p>
- <p>In other literature, demuxers are sometimes called <em class="emph">splitters</em>, because
- their main function is splitting a file into elementary streams (though some
- files only contain one elementary stream).
- </p>
- <p>A schematic representation of a demuxer looks like this:
- </p><pre class="verbatim">┌──────────┬───────────────────────┐
- │ demuxer │ │ packets for stream 0
- ╞══════════╡ elementary stream 0 ├──────────────────────►
- │ │ │
- │ global ├───────────────────────┤
- │properties│ │ packets for stream 1
- │ and │ elementary stream 1 ├──────────────────────►
- │ metadata │ │
- │ ├───────────────────────┤
- │ │ │
- │ │ ........... │
- │ │ │
- │ ├───────────────────────┤
- │ │ │ packets for stream N
- │ │ elementary stream N ├──────────────────────►
- │ │ │
- └──────────┴───────────────────────┘
- ▲
- │
- │ read from file, network stream,
- │ grabbing device, etc.
- │
- </pre>
- </li><li><em class="emph">Decoders</em> receive encoded (compressed) <em class="emph">packets</em> for an audio, video,
- or subtitle elementary stream, and decode them into raw <em class="emph">frames</em> (arrays of
- pixels for video, PCM for audio). A decoder is typically associated with (and
- receives its input from) an elementary stream in a <em class="emph">demuxer</em>, but sometimes
- may also exist on its own (see <a class="ref" href="#Loopback-decoders">Loopback decoders</a>).
- <p>A schematic representation of a decoder looks like this:
- </p><pre class="verbatim"> ┌─────────┐
- packets │ │ raw frames
- ─────────►│ decoder ├────────────►
- │ │
- └─────────┘
- </pre>
- </li><li><em class="emph">Filtergraphs</em> process and transform raw audio or video <em class="emph">frames</em>. A
- filtergraph consists of one or more individual <em class="emph">filters</em> linked into a
- graph. Filtergraphs come in two flavors - <em class="emph">simple</em> and <em class="emph">complex</em>,
- configured with the <samp class="option">-filter</samp> and <samp class="option">-filter_complex</samp> options,
- respectively.
- <p>A simple filtergraph is associated with an <em class="emph">output elementary stream</em>; it
- receives the input to be filtered from a <em class="emph">decoder</em> and sends filtered
- output to that output stream’s <em class="emph">encoder</em>.
- </p>
- <p>A simple video filtergraph that performs deinterlacing (using the <code class="code">yadif</code>
- deinterlacer) followed by resizing (using the <code class="code">scale</code> filter) can look like
- this:
- </p><pre class="verbatim">
- ┌────────────────────────┐
- │ simple filtergraph │
- frames from ╞════════════════════════╡ frames for
- a decoder │ ┌───────┐ ┌───────┐ │ an encoder
- ────────────►├─►│ yadif ├─►│ scale ├─►│────────────►
- │ └───────┘ └───────┘ │
- └────────────────────────┘
- </pre>
- <p>A complex filtergraph is standalone and not associated with any specific stream.
- It may have multiple (or zero) inputs, potentially of different types (audio or
- video), each of which receiving data either from a decoder or another complex
- filtergraph’s output. It also has one or more outputs that feed either an
- encoder or another complex filtergraph’s input.
- </p>
- <p>The following example diagram represents a complex filtergraph with 3 inputs and
- 2 outputs (all video):
- </p><pre class="verbatim"> ┌─────────────────────────────────────────────────┐
- │ complex filtergraph │
- ╞═════════════════════════════════════════════════╡
- frames ├───────┐ ┌─────────┐ ┌─────────┐ ┌────────┤ frames
- ─────────►│input 0├─►│ overlay ├─────►│ overlay ├─►│output 0├────────►
- ├───────┘ │ │ │ │ └────────┤
- frames ├───────┐╭►│ │ ╭►│ │ │
- ─────────►│input 1├╯ └─────────┘ │ └─────────┘ │
- ├───────┘ │ │
- frames ├───────┐ ┌─────┐ ┌─────┬─╯ ┌────────┤ frames
- ─────────►│input 2├►│scale├►│split├───────────────►│output 1├────────►
- ├───────┘ └─────┘ └─────┘ └────────┤
- └─────────────────────────────────────────────────┘
- </pre><p>Frames from second input are overlaid over those from the first. Frames from the
- third input are rescaled, then the duplicated into two identical streams. One of
- them is overlaid over the combined first two inputs, with the result exposed as
- the filtergraph’s first output. The other duplicate ends up being the
- filtergraph’s second output.
- </p>
- </li><li><em class="emph">Encoders</em> receive raw audio, video, or subtitle <em class="emph">frames</em> and encode
- them into encoded <em class="emph">packets</em>. The encoding (compression) process is
- typically <em class="emph">lossy</em> - it degrades stream quality to make the output smaller;
- some encoders are <em class="emph">lossless</em>, but at the cost of much higher output size. A
- video or audio encoder receives its input from some filtergraph’s output,
- subtitle encoders receive input from a decoder (since subtitle filtering is not
- supported yet). Every encoder is associated with some muxer’s <em class="emph">output
- elementary stream</em> and sends its output to that muxer.
- <p>A schematic representation of an encoder looks like this:
- </p><pre class="verbatim"> ┌─────────┐
- raw frames │ │ packets
- ────────────►│ encoder ├─────────►
- │ │
- └─────────┘
- </pre>
- </li><li><em class="emph">Muxers</em> (short for "multiplexers") receive encoded <em class="emph">packets</em> for
- their elementary streams from encoders (the <em class="emph">transcoding</em> path) or directly
- from demuxers (the <em class="emph">streamcopy</em> path), interleave them (when there is more
- than one elementary stream), and write the resulting bytes into the output file
- (or pipe, network stream, etc.).
- <p>A schematic representation of a muxer looks like this:
- </p><pre class="verbatim"> ┌──────────────────────┬───────────┐
- packets for stream 0 │ │ muxer │
- ──────────────────────►│ elementary stream 0 ╞═══════════╡
- │ │ │
- ├──────────────────────┤ global │
- packets for stream 1 │ │properties │
- ──────────────────────►│ elementary stream 1 │ and │
- │ │ metadata │
- ├──────────────────────┤ │
- │ │ │
- │ ........... │ │
- │ │ │
- ├──────────────────────┤ │
- packets for stream N │ │ │
- ──────────────────────►│ elementary stream N │ │
- │ │ │
- └──────────────────────┴─────┬─────┘
- │
- write to file, network stream, │
- grabbing device, etc. │
- │
- ▼
- </pre>
- </li></ul>
- <a name="Streamcopy"></a>
- <h3 class="section">3.1 Streamcopy<span class="pull-right"><a class="anchor hidden-xs" href="#Streamcopy" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Streamcopy" aria-hidden="true">TOC</a></span></h3>
- <p>The simplest pipeline in <code class="command">ffmpeg</code> is single-stream
- <em class="emph">streamcopy</em>, that is copying one <em class="emph">input elementary stream</em>’s packets
- without decoding, filtering, or encoding them. As an example, consider an input
- file called <samp class="file">INPUT.mkv</samp> with 3 elementary streams, from which we take the
- second and write it to file <samp class="file">OUTPUT.mp4</samp>. A schematic representation of
- such a pipeline looks like this:
- </p><pre class="verbatim">┌──────────┬─────────────────────┐
- │ demuxer │ │ unused
- ╞══════════╡ elementary stream 0 ├────────╳
- │ │ │
- │INPUT.mkv ├─────────────────────┤ ┌──────────────────────┬───────────┐
- │ │ │ packets │ │ muxer │
- │ │ elementary stream 1 ├─────────►│ elementary stream 0 ╞═══════════╡
- │ │ │ │ │OUTPUT.mp4 │
- │ ├─────────────────────┤ └──────────────────────┴───────────┘
- │ │ │ unused
- │ │ elementary stream 2 ├────────╳
- │ │ │
- └──────────┴─────────────────────┘
- </pre>
- <p>The above pipeline can be constructed with the following commandline:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT.mkv -map 0:1 -c copy OUTPUT.mp4
- </pre></div>
- <p>In this commandline
- </p><ul class="itemize mark-bullet">
- <li>there is a single input <samp class="file">INPUT.mkv</samp>;
- </li><li>there are no input options for this input;
- </li><li>there is a single output <samp class="file">OUTPUT.mp4</samp>;
- </li><li>there are two output options for this output:
- <ul class="itemize mark-bullet">
- <li><code class="code">-map 0:1</code> selects the input stream to be used - from input with index 0
- (i.e. the first one) the stream with index 1 (i.e. the second one);
- </li><li><code class="code">-c copy</code> selects the <code class="code">copy</code> encoder, i.e. streamcopy with no decoding
- or encoding.
- </li></ul>
- </li></ul>
- <p>Streamcopy is useful for changing the elementary stream count, container format,
- or modifying container-level metadata. Since there is no decoding or encoding,
- it is very fast and there is no quality loss. However, it might not work in some
- cases because of a variety of factors (e.g. certain information required by the
- target container is not available in the source). Applying filters is obviously
- also impossible, since filters work on decoded frames.
- </p>
- <p>More complex streamcopy scenarios can be constructed - e.g. combining streams
- from two input files into a single output:
- </p><pre class="verbatim">┌──────────┬────────────────────┐ ┌────────────────────┬───────────┐
- │ demuxer 0│ │ packets │ │ muxer │
- ╞══════════╡elementary stream 0 ├────────►│elementary stream 0 ╞═══════════╡
- │INPUT0.mkv│ │ │ │OUTPUT.mp4 │
- └──────────┴────────────────────┘ ├────────────────────┤ │
- ┌──────────┬────────────────────┐ │ │ │
- │ demuxer 1│ │ packets │elementary stream 1 │ │
- ╞══════════╡elementary stream 0 ├────────►│ │ │
- │INPUT1.aac│ │ └────────────────────┴───────────┘
- └──────────┴────────────────────┘
- </pre><p>that can be built by the commandline
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT0.mkv -i INPUT1.aac -map 0:0 -map 1:0 -c copy OUTPUT.mp4
- </pre></div>
- <p>The output <samp class="option">-map</samp> option is used twice here, creating two streams in the
- output file - one fed by the first input and one by the second. The single
- instance of the <samp class="option">-c</samp> option selects streamcopy for both of those streams.
- You could also use multiple instances of this option together with
- <a class="ref" href="#Stream-specifiers">Stream specifiers</a> to apply different values to each stream, as will be
- demonstrated in following sections.
- </p>
- <p>A converse scenario is splitting multiple streams from a single input into
- multiple outputs:
- </p><pre class="verbatim">┌──────────┬─────────────────────┐ ┌───────────────────┬───────────┐
- │ demuxer │ │ packets │ │ muxer 0 │
- ╞══════════╡ elementary stream 0 ├─────────►│elementary stream 0╞═══════════╡
- │ │ │ │ │OUTPUT0.mp4│
- │INPUT.mkv ├─────────────────────┤ └───────────────────┴───────────┘
- │ │ │ packets ┌───────────────────┬───────────┐
- │ │ elementary stream 1 ├─────────►│ │ muxer 1 │
- │ │ │ │elementary stream 0╞═══════════╡
- └──────────┴─────────────────────┘ │ │OUTPUT1.mp4│
- └───────────────────┴───────────┘
- </pre><p>built with
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT.mkv -map 0:0 -c copy OUTPUT0.mp4 -map 0:1 -c copy OUTPUT1.mp4
- </pre></div>
- <p>Note how a separate instance of the <samp class="option">-c</samp> option is needed for every
- output file even though their values are the same. This is because non-global
- options (which is most of them) only apply in the context of the file before
- which they are placed.
- </p>
- <p>These examples can of course be further generalized into arbitrary remappings
- of any number of inputs into any number of outputs.
- </p>
- <a name="Transcoding"></a>
- <h3 class="section">3.2 Transcoding<span class="pull-right"><a class="anchor hidden-xs" href="#Transcoding" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Transcoding" aria-hidden="true">TOC</a></span></h3>
- <p><em class="emph">Transcoding</em> is the process of decoding a stream and then encoding it
- again. Since encoding tends to be computationally expensive and in most cases
- degrades the stream quality (i.e. it is <em class="emph">lossy</em>), you should only transcode
- when you need to and perform streamcopy otherwise. Typical reasons to transcode
- are:
- </p>
- <ul class="itemize mark-bullet">
- <li>applying filters - e.g. resizing, deinterlacing, or overlaying video; resampling
- or mixing audio;
- </li><li>you want to feed the stream to something that cannot decode the original codec.
- </li></ul>
- <p>Note that <code class="command">ffmpeg</code> will transcode all audio, video, and subtitle streams
- unless you specify <samp class="option">-c copy</samp> for them.
- </p>
- <p>Consider an example pipeline that reads an input file with one audio and one
- video stream, transcodes the video and copies the audio into a single output
- file. This can be schematically represented as follows
- </p><pre class="verbatim">┌──────────┬─────────────────────┐
- │ demuxer │ │ audio packets
- ╞══════════╡ stream 0 (audio) ├─────────────────────────────────────╮
- │ │ │ │
- │INPUT.mkv ├─────────────────────┤ video ┌─────────┐ raw │
- │ │ │ packets │ video │ video frames │
- │ │ stream 1 (video) ├─────────►│ decoder ├──────────────╮ │
- │ │ │ │ │ │ │
- └──────────┴─────────────────────┘ └─────────┘ │ │
- ▼ ▼
- │ │
- ┌──────────┬─────────────────────┐ video ┌─────────┐ │ │
- │ muxer │ │ packets │ video │ │ │
- ╞══════════╡ stream 0 (video) │◄─────────┤ encoder ├──────────────╯ │
- │ │ │ │(libx264)│ │
- │OUTPUT.mp4├─────────────────────┤ └─────────┘ │
- │ │ │ │
- │ │ stream 1 (audio) │◄────────────────────────────────────╯
- │ │ │
- └──────────┴─────────────────────┘
- </pre><p>and implemented with the following commandline:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT.mkv -map 0:v -map 0:a -c:v libx264 -c:a copy OUTPUT.mp4
- </pre></div>
- <p>Note how it uses stream specifiers <code class="code">:v</code> and <code class="code">:a</code> to select input
- streams and apply different values of the <samp class="option">-c</samp> option to them; see the
- <a class="ref" href="#Stream-specifiers">Stream specifiers</a> section for more details.
- </p>
- <a name="Filtering"></a>
- <h3 class="section">3.3 Filtering<span class="pull-right"><a class="anchor hidden-xs" href="#Filtering" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Filtering" aria-hidden="true">TOC</a></span></h3>
- <p>When transcoding, audio and video streams can be filtered before encoding, with
- either a <em class="emph">simple</em> or <em class="emph">complex</em> filtergraph.
- </p>
- <a name="Simple-filtergraphs"></a>
- <h4 class="subsection">3.3.1 Simple filtergraphs<span class="pull-right"><a class="anchor hidden-xs" href="#Simple-filtergraphs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Simple-filtergraphs" aria-hidden="true">TOC</a></span></h4>
- <p>Simple filtergraphs are those that have exactly one input and output, both of
- the same type (audio or video). They are configured with the per-stream
- <samp class="option">-filter</samp> option (with <samp class="option">-vf</samp> and <samp class="option">-af</samp> aliases for
- <samp class="option">-filter:v</samp> (video) and <samp class="option">-filter:a</samp> (audio) respectively). Note
- that simple filtergraphs are tied to their output stream, so e.g. if you have
- multiple audio streams, <samp class="option">-af</samp> will create a separate filtergraph for each
- one.
- </p>
- <p>Taking the transcoding example from above, adding filtering (and omitting audio,
- for clarity) makes it look like this:
- </p><pre class="verbatim">┌──────────┬───────────────┐
- │ demuxer │ │ ┌─────────┐
- ╞══════════╡ video stream │ packets │ video │ frames
- │INPUT.mkv │ ├─────────►│ decoder ├─────►───╮
- │ │ │ └─────────┘ │
- └──────────┴───────────────┘ │
- ╭───────────◄───────────╯
- │ ┌────────────────────────┐
- │ │ simple filtergraph │
- │ ╞════════════════════════╡
- │ │ ┌───────┐ ┌───────┐ │
- ╰──►├─►│ yadif ├─►│ scale ├─►├╮
- │ └───────┘ └───────┘ ││
- └────────────────────────┘│
- │
- │
- ┌──────────┬───────────────┐ video ┌─────────┐ │
- │ muxer │ │ packets │ video │ │
- ╞══════════╡ video stream │◄─────────┤ encoder ├───────◄───────╯
- │OUTPUT.mp4│ │ │ │
- │ │ │ └─────────┘
- └──────────┴───────────────┘
- </pre>
- <a name="Complex-filtergraphs"></a>
- <h4 class="subsection">3.3.2 Complex filtergraphs<span class="pull-right"><a class="anchor hidden-xs" href="#Complex-filtergraphs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Complex-filtergraphs" aria-hidden="true">TOC</a></span></h4>
- <p>Complex filtergraphs are those which cannot be described as simply a linear
- processing chain applied to one stream. This is the case, for example, when the
- graph has more than one input and/or output, or when output stream type is
- different from input. Complex filtergraphs are configured with the
- <samp class="option">-filter_complex</samp> option. Note that this option is global, since a
- complex filtergraph, by its nature, cannot be unambiguously associated with a
- single stream or file. Each instance of <samp class="option">-filter_complex</samp> creates a new
- complex filtergraph, and there can be any number of them.
- </p>
- <p>A trivial example of a complex filtergraph is the <code class="code">overlay</code> filter, which
- has two video inputs and one video output, containing one video overlaid on top
- of the other. Its audio counterpart is the <code class="code">amix</code> filter.
- </p>
- <a class="anchor" id="Loopback-decoders"></a><a name="Loopback-decoders-1"></a>
- <h3 class="section">3.4 Loopback decoders<span class="pull-right"><a class="anchor hidden-xs" href="#Loopback-decoders-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Loopback-decoders-1" aria-hidden="true">TOC</a></span></h3>
- <p>While decoders are normally associated with demuxer streams, it is also possible
- to create "loopback" decoders that decode the output from some encoder and allow
- it to be fed back to complex filtergraphs. This is done with the <code class="code">-dec</code>
- directive, which takes as a parameter the index of the output stream that should
- be decoded. Every such directive creates a new loopback decoder, indexed with
- successive integers starting at zero. These indices should then be used to refer
- to loopback decoders in complex filtergraph link labels, as described in the
- documentation for <samp class="option">-filter_complex</samp>.
- </p>
- <p>Decoding AVOptions can be passed to loopback decoders by placing them before
- <code class="code">-dec</code>, analogously to input/output options.
- </p>
- <p>E.g. the following example:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT \
- -map 0:v:0 -c:v libx264 -crf 45 -f null - \
- -threads 3 -dec 0:0 \
- -filter_complex '[0:v][dec:0]hstack[stack]' \
- -map '[stack]' -c:v ffv1 OUTPUT
- </pre></div>
- <p>reads an input video and
- </p><ul class="itemize mark-bullet">
- <li>(line 2) encodes it with <code class="code">libx264</code> at low quality;
- </li><li>(line 3) decodes this encoded stream using 3 threads;
- </li><li>(line 4) places decoded video side by side with the original input video;
- </li><li>(line 5) combined video is then losslessly encoded and written into
- <samp class="file">OUTPUT</samp>.
- </li></ul>
- <p>Such a transcoding pipeline can be represented with the following diagram:
- </p><pre class="verbatim">┌──────────┬───────────────┐
- │ demuxer │ │ ┌─────────┐ ┌─────────┐ ┌────────────────────┐
- ╞══════════╡ video stream │ │ video │ │ video │ │ null muxer │
- │ INPUT │ ├──►│ decoder ├──┬────────►│ encoder ├─┬─►│(discards its input)│
- │ │ │ └─────────┘ │ │(libx264)│ │ └────────────────────┘
- └──────────┴───────────────┘ │ └─────────┘ │
- ╭───────◄──╯ ┌─────────┐ │
- │ │loopback │ │
- │ ╭─────◄──────┤ decoder ├────◄──╯
- │ │ └─────────┘
- │ │
- │ │
- │ │ ┌───────────────────┐
- │ │ │complex filtergraph│
- │ │ ╞═══════════════════╡
- │ │ │ ┌─────────────┐ │
- ╰─╫─►├─►│ hstack ├─►├╮
- ╰─►├─►│ │ ││
- │ └─────────────┘ ││
- └───────────────────┘│
- │
- ┌──────────┬───────────────┐ ┌─────────┐ │
- │ muxer │ │ │ video │ │
- ╞══════════╡ video stream │◄─┤ encoder ├───────◄──────────╯
- │ OUTPUT │ │ │ (ffv1) │
- │ │ │ └─────────┘
- └──────────┴───────────────┘
- </pre>
- <a class="anchor" id="Stream-selection"></a><a name="Stream-selection-1"></a>
- <h2 class="chapter">4 Stream selection<span class="pull-right"><a class="anchor hidden-xs" href="#Stream-selection-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Stream-selection-1" aria-hidden="true">TOC</a></span></h2>
- <p><code class="command">ffmpeg</code> provides the <code class="code">-map</code> option for manual control of stream selection in each
- output file. Users can skip <code class="code">-map</code> and let ffmpeg perform automatic stream selection as
- described below. The <code class="code">-vn / -an / -sn / -dn</code> options can be used to skip inclusion of
- video, audio, subtitle and data streams respectively, whether manually mapped or automatically
- selected, except for those streams which are outputs of complex filtergraphs.
- </p>
- <a name="Description-1"></a>
- <h3 class="section">4.1 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description-1" aria-hidden="true">TOC</a></span></h3>
- <p>The sub-sections that follow describe the various rules that are involved in stream selection.
- The examples that follow next show how these rules are applied in practice.
- </p>
- <p>While every effort is made to accurately reflect the behavior of the program, FFmpeg is under
- continuous development and the code may have changed since the time of this writing.
- </p>
- <a name="Automatic-stream-selection"></a>
- <h4 class="subsection">4.1.1 Automatic stream selection<span class="pull-right"><a class="anchor hidden-xs" href="#Automatic-stream-selection" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Automatic-stream-selection" aria-hidden="true">TOC</a></span></h4>
- <p>In the absence of any map options for a particular output file, ffmpeg inspects the output
- format to check which type of streams can be included in it, viz. video, audio and/or
- subtitles. For each acceptable stream type, ffmpeg will pick one stream, when available,
- from among all the inputs.
- </p>
- <p>It will select that stream based upon the following criteria:
- </p><ul class="itemize mark-bullet">
- <li>for video, it is the stream with the highest resolution,
- </li><li>for audio, it is the stream with the most channels,
- </li><li>for subtitles, it is the first subtitle stream found but there’s a caveat.
- The output format’s default subtitle encoder can be either text-based or image-based,
- and only a subtitle stream of the same type will be chosen.
- </li></ul>
- <p>In the case where several streams of the same type rate equally, the stream with the lowest
- index is chosen.
- </p>
- <p>Data or attachment streams are not automatically selected and can only be included
- using <code class="code">-map</code>.
- </p><a name="Manual-stream-selection"></a>
- <h4 class="subsection">4.1.2 Manual stream selection<span class="pull-right"><a class="anchor hidden-xs" href="#Manual-stream-selection" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Manual-stream-selection" aria-hidden="true">TOC</a></span></h4>
- <p>When <code class="code">-map</code> is used, only user-mapped streams are included in that output file,
- with one possible exception for filtergraph outputs described below.
- </p>
- <a name="Complex-filtergraphs-1"></a>
- <h4 class="subsection">4.1.3 Complex filtergraphs<span class="pull-right"><a class="anchor hidden-xs" href="#Complex-filtergraphs-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Complex-filtergraphs-1" aria-hidden="true">TOC</a></span></h4>
- <p>If there are any complex filtergraph output streams with unlabeled pads, they will be added
- to the first output file. This will lead to a fatal error if the stream type is not supported
- by the output format. In the absence of the map option, the inclusion of these streams leads
- to the automatic stream selection of their types being skipped. If map options are present,
- these filtergraph streams are included in addition to the mapped streams.
- </p>
- <p>Complex filtergraph output streams with labeled pads must be mapped once and exactly once.
- </p>
- <a name="Stream-handling"></a>
- <h4 class="subsection">4.1.4 Stream handling<span class="pull-right"><a class="anchor hidden-xs" href="#Stream-handling" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Stream-handling" aria-hidden="true">TOC</a></span></h4>
- <p>Stream handling is independent of stream selection, with an exception for subtitles described
- below. Stream handling is set via the <code class="code">-codec</code> option addressed to streams within a
- specific <em class="emph">output</em> file. In particular, codec options are applied by ffmpeg after the
- stream selection process and thus do not influence the latter. If no <code class="code">-codec</code> option is
- specified for a stream type, ffmpeg will select the default encoder registered by the output
- file muxer.
- </p>
- <p>An exception exists for subtitles. If a subtitle encoder is specified for an output file, the
- first subtitle stream found of any type, text or image, will be included. ffmpeg does not validate
- if the specified encoder can convert the selected stream or if the converted stream is acceptable
- within the output format. This applies generally as well: when the user sets an encoder manually,
- the stream selection process cannot check if the encoded stream can be muxed into the output file.
- If it cannot, ffmpeg will abort and <em class="emph">all</em> output files will fail to be processed.
- </p>
- <a name="Examples"></a>
- <h3 class="section">4.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples" aria-hidden="true">TOC</a></span></h3>
- <p>The following examples illustrate the behavior, quirks and limitations of ffmpeg’s stream
- selection methods.
- </p>
- <p>They assume the following three input files.
- </p>
- <pre class="verbatim">
- input file 'A.avi'
- stream 0: video 640x360
- stream 1: audio 2 channels
- input file 'B.mp4'
- stream 0: video 1920x1080
- stream 1: audio 2 channels
- stream 2: subtitles (text)
- stream 3: audio 5.1 channels
- stream 4: subtitles (text)
- input file 'C.mkv'
- stream 0: video 1280x720
- stream 1: audio 2 channels
- stream 2: subtitles (image)
- </pre>
- <a name="Example_003a-automatic-stream-selection"></a>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i A.avi -i B.mp4 out1.mkv out2.wav -map 1:a -c:a copy out3.mov
- </pre></div>
- <p>There are three output files specified, and for the first two, no <code class="code">-map</code> options
- are set, so ffmpeg will select streams for these two files automatically.
- </p>
- <p><samp class="file">out1.mkv</samp> is a Matroska container file and accepts video, audio and subtitle streams,
- so ffmpeg will try to select one of each type.<br>
- For video, it will select <code class="code">stream 0</code> from <samp class="file">B.mp4</samp>, which has the highest
- resolution among all the input video streams.<br>
- For audio, it will select <code class="code">stream 3</code> from <samp class="file">B.mp4</samp>, since it has the greatest
- number of channels.<br>
- For subtitles, it will select <code class="code">stream 2</code> from <samp class="file">B.mp4</samp>, which is the first subtitle
- stream from among <samp class="file">A.avi</samp> and <samp class="file">B.mp4</samp>.
- </p>
- <p><samp class="file">out2.wav</samp> accepts only audio streams, so only <code class="code">stream 3</code> from <samp class="file">B.mp4</samp> is
- selected.
- </p>
- <p>For <samp class="file">out3.mov</samp>, since a <code class="code">-map</code> option is set, no automatic stream selection will
- occur. The <code class="code">-map 1:a</code> option will select all audio streams from the second input
- <samp class="file">B.mp4</samp>. No other streams will be included in this output file.
- </p>
- <p>For the first two outputs, all included streams will be transcoded. The encoders chosen will
- be the default ones registered by each output format, which may not match the codec of the
- selected input streams.
- </p>
- <p>For the third output, codec option for audio streams has been set
- to <code class="code">copy</code>, so no decoding-filtering-encoding operations will occur, or <em class="emph">can</em> occur.
- Packets of selected streams shall be conveyed from the input file and muxed within the output
- file.
- </p>
- <a name="Example_003a-automatic-subtitles-selection"></a>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i C.mkv out1.mkv -c:s dvdsub -an out2.mkv
- </pre></div>
- <p>Although <samp class="file">out1.mkv</samp> is a Matroska container file which accepts subtitle streams, only a
- video and audio stream shall be selected. The subtitle stream of <samp class="file">C.mkv</samp> is image-based
- and the default subtitle encoder of the Matroska muxer is text-based, so a transcode operation
- for the subtitles is expected to fail and hence the stream isn’t selected. However, in
- <samp class="file">out2.mkv</samp>, a subtitle encoder is specified in the command and so, the subtitle stream is
- selected, in addition to the video stream. The presence of <code class="code">-an</code> disables audio stream
- selection for <samp class="file">out2.mkv</samp>.
- </p>
- <a name="Example_003a-unlabeled-filtergraph-outputs"></a>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i A.avi -i C.mkv -i B.mp4 -filter_complex "overlay" out1.mp4 out2.srt
- </pre></div>
- <p>A filtergraph is setup here using the <code class="code">-filter_complex</code> option and consists of a single
- video filter. The <code class="code">overlay</code> filter requires exactly two video inputs, but none are
- specified, so the first two available video streams are used, those of <samp class="file">A.avi</samp> and
- <samp class="file">C.mkv</samp>. The output pad of the filter has no label and so is sent to the first output file
- <samp class="file">out1.mp4</samp>. Due to this, automatic selection of the video stream is skipped, which would
- have selected the stream in <samp class="file">B.mp4</samp>. The audio stream with most channels viz. <code class="code">stream 3</code>
- in <samp class="file">B.mp4</samp>, is chosen automatically. No subtitle stream is chosen however, since the MP4
- format has no default subtitle encoder registered, and the user hasn’t specified a subtitle encoder.
- </p>
- <p>The 2nd output file, <samp class="file">out2.srt</samp>, only accepts text-based subtitle streams. So, even though
- the first subtitle stream available belongs to <samp class="file">C.mkv</samp>, it is image-based and hence skipped.
- The selected stream, <code class="code">stream 2</code> in <samp class="file">B.mp4</samp>, is the first text-based subtitle stream.
- </p>
- <a name="Example_003a-labeled-filtergraph-outputs"></a>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0[outv];overlay;aresample" \
- -map '[outv]' -an out1.mp4 \
- out2.mkv \
- -map '[outv]' -map 1:a:0 out3.mkv
- </pre></div>
- <p>The above command will fail, as the output pad labelled <code class="code">[outv]</code> has been mapped twice.
- None of the output files shall be processed.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0[outv];overlay;aresample" \
- -an out1.mp4 \
- out2.mkv \
- -map 1:a:0 out3.mkv
- </pre></div>
- <p>This command above will also fail as the hue filter output has a label, <code class="code">[outv]</code>,
- and hasn’t been mapped anywhere.
- </p>
- <p>The command should be modified as follows,
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0,split=2[outv1][outv2];overlay;aresample" \
- -map '[outv1]' -an out1.mp4 \
- out2.mkv \
- -map '[outv2]' -map 1:a:0 out3.mkv
- </pre></div>
- <p>The video stream from <samp class="file">B.mp4</samp> is sent to the hue filter, whose output is cloned once using
- the split filter, and both outputs labelled. Then a copy each is mapped to the first and third
- output files.
- </p>
- <p>The overlay filter, requiring two video inputs, uses the first two unused video streams. Those
- are the streams from <samp class="file">A.avi</samp> and <samp class="file">C.mkv</samp>. The overlay output isn’t labelled, so it is
- sent to the first output file <samp class="file">out1.mp4</samp>, regardless of the presence of the <code class="code">-map</code> option.
- </p>
- <p>The aresample filter is sent the first unused audio stream, that of <samp class="file">A.avi</samp>. Since this filter
- output is also unlabelled, it too is mapped to the first output file. The presence of <code class="code">-an</code>
- only suppresses automatic or manual stream selection of audio streams, not outputs sent from
- filtergraphs. Both these mapped streams shall be ordered before the mapped stream in <samp class="file">out1.mp4</samp>.
- </p>
- <p>The video, audio and subtitle streams mapped to <code class="code">out2.mkv</code> are entirely determined by
- automatic stream selection.
- </p>
- <p><samp class="file">out3.mkv</samp> consists of the cloned video output from the hue filter and the first audio
- stream from <samp class="file">B.mp4</samp>.
- <br>
- </p>
- <a name="Options"></a>
- <h2 class="chapter">5 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options" aria-hidden="true">TOC</a></span></h2>
- <p>All the numerical options, if not specified otherwise, accept a string
- representing a number as input, which may be followed by one of the SI
- unit prefixes, for example: ’K’, ’M’, or ’G’.
- </p>
- <p>If ’i’ is appended to the SI unit prefix, the complete prefix will be
- interpreted as a unit prefix for binary multiples, which are based on
- powers of 1024 instead of powers of 1000. Appending ’B’ to the SI unit
- prefix multiplies the value by 8. This allows using, for example:
- ’KB’, ’MiB’, ’G’ and ’B’ as number suffixes.
- </p>
- <p>Options which do not take arguments are boolean options, and set the
- corresponding value to true. They can be set to false by prefixing
- the option name with "no". For example using "-nofoo"
- will set the boolean option with name "foo" to false.
- </p>
- <p>Options that take arguments support a special syntax where the argument given on
- the command line is interpreted as a path to the file from which the actual
- argument value is loaded. To use this feature, add a forward slash ’/’
- immediately before the option name (after the leading dash). E.g.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -/filter:v filter.script OUTPUT
- </pre></div>
- <p>will load a filtergraph description from the file named <samp class="file">filter.script</samp>.
- </p>
- <a class="anchor" id="Stream-specifiers"></a><a name="Stream-specifiers-1"></a>
- <h3 class="section">5.1 Stream specifiers<span class="pull-right"><a class="anchor hidden-xs" href="#Stream-specifiers-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Stream-specifiers-1" aria-hidden="true">TOC</a></span></h3>
- <p>Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers
- are used to precisely specify which stream(s) a given option belongs to.
- </p>
- <p>A stream specifier is a string generally appended to the option name and
- separated from it by a colon. E.g. <code class="code">-codec:a:1 ac3</code> contains the
- <code class="code">a:1</code> stream specifier, which matches the second audio stream. Therefore, it
- would select the ac3 codec for the second audio stream.
- </p>
- <p>A stream specifier can match several streams, so that the option is applied to all
- of them. E.g. the stream specifier in <code class="code">-b:a 128k</code> matches all audio
- streams.
- </p>
- <p>An empty stream specifier matches all streams. For example, <code class="code">-codec copy</code>
- or <code class="code">-codec: copy</code> would copy all the streams without reencoding.
- </p>
- <p>Possible forms of stream specifiers are:
- </p><dl class="table">
- <dt><samp class="option"><var class="var">stream_index</var></samp></dt>
- <dd><p>Matches the stream with this index. E.g. <code class="code">-threads:1 4</code> would set the
- thread count for the second stream to 4. If <var class="var">stream_index</var> is used as an
- additional stream specifier (see below), then it selects stream number
- <var class="var">stream_index</var> from the matching streams. Stream numbering is based on the
- order of the streams as detected by libavformat except when a stream group
- specifier or program ID is also specified. In this case it is based on the
- ordering of the streams in the group or program.
- </p></dd>
- <dt><samp class="option"><var class="var">stream_type</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
- <dd><p><var class="var">stream_type</var> is one of following: ’v’ or ’V’ for video, ’a’ for audio, ’s’
- for subtitle, ’d’ for data, and ’t’ for attachments. ’v’ matches all video
- streams, ’V’ only matches video streams which are not attached pictures, video
- thumbnails or cover arts. If <var class="var">additional_stream_specifier</var> is used, then
- it matches streams which both have this type and match the
- <var class="var">additional_stream_specifier</var>. Otherwise, it matches all streams of the
- specified type.
- </p></dd>
- <dt><samp class="option">g:<var class="var">group_specifier</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
- <dd><p>Matches streams which are in the group with the specifier <var class="var">group_specifier</var>.
- if <var class="var">additional_stream_specifier</var> is used, then it matches streams which both
- are part of the group and match the <var class="var">additional_stream_specifier</var>.
- <var class="var">group_specifier</var> may be one of the following:
- </p><dl class="table">
- <dt><samp class="option"><var class="var">group_index</var></samp></dt>
- <dd><p>Match the stream with this group index.
- </p></dd>
- <dt><samp class="option">#<var class="var">group_id</var> or i:<var class="var">group_id</var></samp></dt>
- <dd><p>Match the stream with this group id.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">p:<var class="var">program_id</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
- <dd><p>Matches streams which are in the program with the id <var class="var">program_id</var>. If
- <var class="var">additional_stream_specifier</var> is used, then it matches streams which both
- are part of the program and match the <var class="var">additional_stream_specifier</var>.
- </p>
- </dd>
- <dt><samp class="option">#<var class="var">stream_id</var> or i:<var class="var">stream_id</var></samp></dt>
- <dd><p>Match the stream by stream id (e.g. PID in MPEG-TS container).
- </p></dd>
- <dt><samp class="option">m:<var class="var">key</var>[:<var class="var">value</var>]</samp></dt>
- <dd><p>Matches streams with the metadata tag <var class="var">key</var> having the specified value. If
- <var class="var">value</var> is not given, matches streams that contain the given tag with any
- value. The colon character ’:’ in <var class="var">key</var> or <var class="var">value</var> needs to be
- backslash-escaped.
- </p></dd>
- <dt><samp class="option">disp:<var class="var">dispositions</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
- <dd><p>Matches streams with the given disposition(s). <var class="var">dispositions</var> is a list of
- one or more dispositions (as printed by the <samp class="option">-dispositions</samp> option)
- joined with ’+’.
- </p></dd>
- <dt><samp class="option">u</samp></dt>
- <dd><p>Matches streams with usable configuration, the codec must be defined and the
- essential information such as video dimension or audio sample rate must be present.
- </p>
- <p>Note that in <code class="command">ffmpeg</code>, matching by metadata will only work properly for
- input files.
- </p></dd>
- </dl>
- <a name="Generic-options"></a>
- <h3 class="section">5.2 Generic options<span class="pull-right"><a class="anchor hidden-xs" href="#Generic-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Generic-options" aria-hidden="true">TOC</a></span></h3>
- <p>These options are shared amongst the ff* tools.
- </p>
- <dl class="table">
- <dt><samp class="option">-L, -license</samp></dt>
- <dd><p>Show license.
- </p>
- </dd>
- <dt><samp class="option">-h, -?, -help, --help [<var class="var">arg</var>]</samp></dt>
- <dd><p>Show help. An optional parameter may be specified to print help about a specific
- item. If no argument is specified, only basic (non advanced) tool
- options are shown.
- </p>
- <p>Possible values of <var class="var">arg</var> are:
- </p><dl class="table">
- <dt><samp class="option">long</samp></dt>
- <dd><p>Print advanced tool options in addition to the basic tool options.
- </p>
- </dd>
- <dt><samp class="option">full</samp></dt>
- <dd><p>Print complete list of options, including shared and private options
- for encoders, decoders, demuxers, muxers, filters, etc.
- </p>
- </dd>
- <dt><samp class="option">decoder=<var class="var">decoder_name</var></samp></dt>
- <dd><p>Print detailed information about the decoder named <var class="var">decoder_name</var>. Use the
- <samp class="option">-decoders</samp> option to get a list of all decoders.
- </p>
- </dd>
- <dt><samp class="option">encoder=<var class="var">encoder_name</var></samp></dt>
- <dd><p>Print detailed information about the encoder named <var class="var">encoder_name</var>. Use the
- <samp class="option">-encoders</samp> option to get a list of all encoders.
- </p>
- </dd>
- <dt><samp class="option">demuxer=<var class="var">demuxer_name</var></samp></dt>
- <dd><p>Print detailed information about the demuxer named <var class="var">demuxer_name</var>. Use the
- <samp class="option">-formats</samp> option to get a list of all demuxers and muxers.
- </p>
- </dd>
- <dt><samp class="option">muxer=<var class="var">muxer_name</var></samp></dt>
- <dd><p>Print detailed information about the muxer named <var class="var">muxer_name</var>. Use the
- <samp class="option">-formats</samp> option to get a list of all muxers and demuxers.
- </p>
- </dd>
- <dt><samp class="option">filter=<var class="var">filter_name</var></samp></dt>
- <dd><p>Print detailed information about the filter named <var class="var">filter_name</var>. Use the
- <samp class="option">-filters</samp> option to get a list of all filters.
- </p>
- </dd>
- <dt><samp class="option">bsf=<var class="var">bitstream_filter_name</var></samp></dt>
- <dd><p>Print detailed information about the bitstream filter named <var class="var">bitstream_filter_name</var>.
- Use the <samp class="option">-bsfs</samp> option to get a list of all bitstream filters.
- </p>
- </dd>
- <dt><samp class="option">protocol=<var class="var">protocol_name</var></samp></dt>
- <dd><p>Print detailed information about the protocol named <var class="var">protocol_name</var>.
- Use the <samp class="option">-protocols</samp> option to get a list of all protocols.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-version</samp></dt>
- <dd><p>Show version.
- </p>
- </dd>
- <dt><samp class="option">-buildconf</samp></dt>
- <dd><p>Show the build configuration, one option per line.
- </p>
- </dd>
- <dt><samp class="option">-formats</samp></dt>
- <dd><p>Show available formats (including devices).
- </p>
- </dd>
- <dt><samp class="option">-demuxers</samp></dt>
- <dd><p>Show available demuxers.
- </p>
- </dd>
- <dt><samp class="option">-muxers</samp></dt>
- <dd><p>Show available muxers.
- </p>
- </dd>
- <dt><samp class="option">-devices</samp></dt>
- <dd><p>Show available devices.
- </p>
- </dd>
- <dt><samp class="option">-codecs</samp></dt>
- <dd><p>Show all codecs known to libavcodec.
- </p>
- <p>Note that the term ’codec’ is used throughout this documentation as a shortcut
- for what is more correctly called a media bitstream format.
- </p>
- </dd>
- <dt><samp class="option">-decoders</samp></dt>
- <dd><p>Show available decoders.
- </p>
- </dd>
- <dt><samp class="option">-encoders</samp></dt>
- <dd><p>Show all available encoders.
- </p>
- </dd>
- <dt><samp class="option">-bsfs</samp></dt>
- <dd><p>Show available bitstream filters.
- </p>
- </dd>
- <dt><samp class="option">-protocols</samp></dt>
- <dd><p>Show available protocols.
- </p>
- </dd>
- <dt><samp class="option">-filters</samp></dt>
- <dd><p>Show available libavfilter filters.
- </p>
- </dd>
- <dt><samp class="option">-pix_fmts</samp></dt>
- <dd><p>Show available pixel formats.
- </p>
- </dd>
- <dt><samp class="option">-sample_fmts</samp></dt>
- <dd><p>Show available sample formats.
- </p>
- </dd>
- <dt><samp class="option">-layouts</samp></dt>
- <dd><p>Show channel names and standard channel layouts.
- </p>
- </dd>
- <dt><samp class="option">-dispositions</samp></dt>
- <dd><p>Show stream dispositions.
- </p>
- </dd>
- <dt><samp class="option">-colors</samp></dt>
- <dd><p>Show recognized color names.
- </p>
- </dd>
- <dt><samp class="option">-sources <var class="var">device</var>[,<var class="var">opt1</var>=<var class="var">val1</var>[,<var class="var">opt2</var>=<var class="var">val2</var>]...]</samp></dt>
- <dd><p>Show autodetected sources of the input device.
- Some devices may provide system-dependent source names that cannot be autodetected.
- The returned list cannot be assumed to be always complete.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -sources pulse,server=192.168.0.4
- </pre></div>
- </dd>
- <dt><samp class="option">-sinks <var class="var">device</var>[,<var class="var">opt1</var>=<var class="var">val1</var>[,<var class="var">opt2</var>=<var class="var">val2</var>]...]</samp></dt>
- <dd><p>Show autodetected sinks of the output device.
- Some devices may provide system-dependent sink names that cannot be autodetected.
- The returned list cannot be assumed to be always complete.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -sinks pulse,server=192.168.0.4
- </pre></div>
- </dd>
- <dt><samp class="option">-loglevel [<var class="var">flags</var>+]<var class="var">loglevel</var> | -v [<var class="var">flags</var>+]<var class="var">loglevel</var></samp></dt>
- <dd><p>Set logging level and flags used by the library.
- </p>
- <p>The optional <var class="var">flags</var> prefix can consist of the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">repeat</samp>’</dt>
- <dd><p>Indicates that repeated log output should not be compressed to the first line
- and the "Last message repeated n times" line will be omitted.
- </p></dd>
- <dt>‘<samp class="samp">level</samp>’</dt>
- <dd><p>Indicates that log output should add a <code class="code">[level]</code> prefix to each message
- line. This can be used as an alternative to log coloring, e.g. when dumping the
- log to file.
- </p></dd>
- <dt>‘<samp class="samp">time</samp>’</dt>
- <dd><p>Indicates that log lines should be prefixed with time information.
- </p></dd>
- <dt>‘<samp class="samp">datetime</samp>’</dt>
- <dd><p>Indicates that log lines should be prefixed with date and time information.
- </p></dd>
- </dl>
- <p>Flags can also be used alone by adding a ’+’/’-’ prefix to set/reset a single
- flag without affecting other <var class="var">flags</var> or changing <var class="var">loglevel</var>. When
- setting both <var class="var">flags</var> and <var class="var">loglevel</var>, a ’+’ separator is expected
- between the last <var class="var">flags</var> value and before <var class="var">loglevel</var>.
- </p>
- <p><var class="var">loglevel</var> is a string or a number containing one of the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">quiet, -8</samp>’</dt>
- <dd><p>Show nothing at all; be silent.
- </p></dd>
- <dt>‘<samp class="samp">panic, 0</samp>’</dt>
- <dd><p>Only show fatal errors which could lead the process to crash, such as
- an assertion failure. This is not currently used for anything.
- </p></dd>
- <dt>‘<samp class="samp">fatal, 8</samp>’</dt>
- <dd><p>Only show fatal errors. These are errors after which the process absolutely
- cannot continue.
- </p></dd>
- <dt>‘<samp class="samp">error, 16</samp>’</dt>
- <dd><p>Show all errors, including ones which can be recovered from.
- </p></dd>
- <dt>‘<samp class="samp">warning, 24</samp>’</dt>
- <dd><p>Show all warnings and errors. Any message related to possibly
- incorrect or unexpected events will be shown.
- </p></dd>
- <dt>‘<samp class="samp">info, 32</samp>’</dt>
- <dd><p>Show informative messages during processing. This is in addition to
- warnings and errors. This is the default value.
- </p></dd>
- <dt>‘<samp class="samp">verbose, 40</samp>’</dt>
- <dd><p>Same as <code class="code">info</code>, except more verbose.
- </p></dd>
- <dt>‘<samp class="samp">debug, 48</samp>’</dt>
- <dd><p>Show everything, including debugging information.
- </p></dd>
- <dt>‘<samp class="samp">trace, 56</samp>’</dt>
- </dl>
- <p>For example to enable repeated log output, add the <code class="code">level</code> prefix, and set
- <var class="var">loglevel</var> to <code class="code">verbose</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -loglevel repeat+level+verbose -i input output
- </pre></div>
- <p>Another example that enables repeated log output without affecting current
- state of <code class="code">level</code> prefix flag or <var class="var">loglevel</var>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg [...] -loglevel +repeat
- </pre></div>
- <p>By default the program logs to stderr. If coloring is supported by the
- terminal, colors are used to mark errors and warnings. Log coloring
- can be disabled setting the environment variable
- <code class="env">AV_LOG_FORCE_NOCOLOR</code>, or can be forced setting
- the environment variable <code class="env">AV_LOG_FORCE_COLOR</code>.
- </p>
- </dd>
- <dt><samp class="option">-report</samp></dt>
- <dd><p>Dump full command line and log output to a file named
- <code class="code"><var class="var">program</var>-<var class="var">YYYYMMDD</var>-<var class="var">HHMMSS</var>.log</code> in the current
- directory.
- This file can be useful for bug reports.
- It also implies <code class="code">-loglevel debug</code>.
- </p>
- <p>Setting the environment variable <code class="env">FFREPORT</code> to any value has the
- same effect. If the value is a ’:’-separated key=value sequence, these
- options will affect the report; option values must be escaped if they
- contain special characters or the options delimiter ’:’ (see the
- “Quoting and escaping” section in the ffmpeg-utils manual).
- </p>
- <p>The following options are recognized:
- </p><dl class="table">
- <dt><samp class="option">file</samp></dt>
- <dd><p>set the file name to use for the report; <code class="code">%p</code> is expanded to the name
- of the program, <code class="code">%t</code> is expanded to a timestamp, <code class="code">%%</code> is expanded
- to a plain <code class="code">%</code>
- </p></dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>set the log verbosity level using a numerical value (see <code class="code">-loglevel</code>).
- </p></dd>
- </dl>
- <p>For example, to output a report to a file named <samp class="file">ffreport.log</samp>
- using a log level of <code class="code">32</code> (alias for log level <code class="code">info</code>):
- </p>
- <div class="example">
- <pre class="example-preformatted">FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
- </pre></div>
- <p>Errors in parsing the environment variable are not fatal, and will not
- appear in the report.
- </p>
- </dd>
- <dt><samp class="option">-hide_banner</samp></dt>
- <dd><p>Suppress printing banner.
- </p>
- <p>All FFmpeg tools will normally show a copyright notice, build options
- and library versions. This option can be used to suppress printing
- this information.
- </p>
- </dd>
- <dt><samp class="option">-cpuflags flags (<em class="emph">global</em>)</samp></dt>
- <dd><p>Allows setting and clearing cpu flags. This option is intended
- for testing. Do not use it unless you know what you’re doing.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -cpuflags -sse+mmx ...
- ffmpeg -cpuflags mmx ...
- ffmpeg -cpuflags 0 ...
- </pre></div>
- <p>Possible flags for this option are:
- </p><dl class="table">
- <dt>‘<samp class="samp">x86</samp>’</dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">mmx</samp>’</dt>
- <dt>‘<samp class="samp">mmxext</samp>’</dt>
- <dt>‘<samp class="samp">sse</samp>’</dt>
- <dt>‘<samp class="samp">sse2</samp>’</dt>
- <dt>‘<samp class="samp">sse2slow</samp>’</dt>
- <dt>‘<samp class="samp">sse3</samp>’</dt>
- <dt>‘<samp class="samp">sse3slow</samp>’</dt>
- <dt>‘<samp class="samp">ssse3</samp>’</dt>
- <dt>‘<samp class="samp">atom</samp>’</dt>
- <dt>‘<samp class="samp">sse4.1</samp>’</dt>
- <dt>‘<samp class="samp">sse4.2</samp>’</dt>
- <dt>‘<samp class="samp">avx</samp>’</dt>
- <dt>‘<samp class="samp">avx2</samp>’</dt>
- <dt>‘<samp class="samp">xop</samp>’</dt>
- <dt>‘<samp class="samp">fma3</samp>’</dt>
- <dt>‘<samp class="samp">fma4</samp>’</dt>
- <dt>‘<samp class="samp">3dnow</samp>’</dt>
- <dt>‘<samp class="samp">3dnowext</samp>’</dt>
- <dt>‘<samp class="samp">bmi1</samp>’</dt>
- <dt>‘<samp class="samp">bmi2</samp>’</dt>
- <dt>‘<samp class="samp">cmov</samp>’</dt>
- </dl>
- </dd>
- <dt>‘<samp class="samp">ARM</samp>’</dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">armv5te</samp>’</dt>
- <dt>‘<samp class="samp">armv6</samp>’</dt>
- <dt>‘<samp class="samp">armv6t2</samp>’</dt>
- <dt>‘<samp class="samp">vfp</samp>’</dt>
- <dt>‘<samp class="samp">vfpv3</samp>’</dt>
- <dt>‘<samp class="samp">neon</samp>’</dt>
- <dt>‘<samp class="samp">setend</samp>’</dt>
- </dl>
- </dd>
- <dt>‘<samp class="samp">AArch64</samp>’</dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">armv8</samp>’</dt>
- <dt>‘<samp class="samp">vfp</samp>’</dt>
- <dt>‘<samp class="samp">neon</samp>’</dt>
- </dl>
- </dd>
- <dt>‘<samp class="samp">PowerPC</samp>’</dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">altivec</samp>’</dt>
- </dl>
- </dd>
- <dt>‘<samp class="samp">Specific Processors</samp>’</dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">pentium2</samp>’</dt>
- <dt>‘<samp class="samp">pentium3</samp>’</dt>
- <dt>‘<samp class="samp">pentium4</samp>’</dt>
- <dt>‘<samp class="samp">k6</samp>’</dt>
- <dt>‘<samp class="samp">k62</samp>’</dt>
- <dt>‘<samp class="samp">athlon</samp>’</dt>
- <dt>‘<samp class="samp">athlonxp</samp>’</dt>
- <dt>‘<samp class="samp">k8</samp>’</dt>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">-cpucount <var class="var">count</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Override detection of CPU count. This option is intended
- for testing. Do not use it unless you know what you’re doing.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -cpucount 2
- </pre></div>
- </dd>
- <dt><samp class="option">-max_alloc <var class="var">bytes</var></samp></dt>
- <dd><p>Set the maximum size limit for allocating a block on the heap by ffmpeg’s
- family of malloc functions. Exercise <strong class="strong">extreme caution</strong> when using
- this option. Don’t use if you do not understand the full consequence of doing so.
- Default is INT_MAX.
- </p></dd>
- </dl>
- <a name="AVOptions"></a>
- <h3 class="section">5.3 AVOptions<span class="pull-right"><a class="anchor hidden-xs" href="#AVOptions" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AVOptions" aria-hidden="true">TOC</a></span></h3>
- <p>These options are provided directly by the libavformat, libavdevice and
- libavcodec libraries. To see the list of available AVOptions, use the
- <samp class="option">-help</samp> option. They are separated into two categories:
- </p><dl class="table">
- <dt><samp class="option">generic</samp></dt>
- <dd><p>These options can be set for any container, codec or device. Generic options
- are listed under AVFormatContext options for containers/devices and under
- AVCodecContext options for codecs.
- </p></dd>
- <dt><samp class="option">private</samp></dt>
- <dd><p>These options are specific to the given container, device or codec. Private
- options are listed under their corresponding containers/devices/codecs.
- </p></dd>
- </dl>
- <p>For example to write an ID3v2.3 header instead of a default ID3v2.4 to
- an MP3 file, use the <samp class="option">id3v2_version</samp> private option of the MP3
- muxer:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.flac -id3v2_version 3 out.mp3
- </pre></div>
- <p>All codec AVOptions are per-stream, and thus a stream specifier
- should be attached to them:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
- </pre></div>
- <p>In the above example, a multichannel audio stream is mapped twice for output.
- The first instance is encoded with codec ac3 and bitrate 640k.
- The second instance is downmixed to 2 channels and encoded with codec aac. A bitrate of 128k is specified for it using
- absolute index of the output stream.
- </p>
- <p>Note: the <samp class="option">-nooption</samp> syntax cannot be used for boolean
- AVOptions, use <samp class="option">-option 0</samp>/<samp class="option">-option 1</samp>.
- </p>
- <p>Note: the old undocumented way of specifying per-stream AVOptions by
- prepending v/a/s to the options name is now obsolete and will be
- removed soon.
- </p>
- <a name="Main-options"></a>
- <h3 class="section">5.4 Main options<span class="pull-right"><a class="anchor hidden-xs" href="#Main-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Main-options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-f <var class="var">fmt</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Force input or output file format. The format is normally auto detected for input
- files and guessed from the file extension for output files, so this option is not
- needed in most cases.
- </p>
- </dd>
- <dt><samp class="option">-i <var class="var">url</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>input file url
- </p>
- </dd>
- <dt><samp class="option">-y (<em class="emph">global</em>)</samp></dt>
- <dd><p>Overwrite output files without asking.
- </p>
- </dd>
- <dt><samp class="option">-n (<em class="emph">global</em>)</samp></dt>
- <dd><p>Do not overwrite output files, and exit immediately if a specified
- output file already exists.
- </p>
- </dd>
- <dt><samp class="option">-stream_loop <var class="var">number</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set number of times input stream shall be looped. Loop 0 means no loop,
- loop -1 means infinite loop.
- </p>
- </dd>
- <dt><samp class="option">-recast_media (<em class="emph">global</em>)</samp></dt>
- <dd><p>Allow forcing a decoder of a different media type than the one
- detected or designated by the demuxer. Useful for decoding media
- data muxed as data streams.
- </p>
- </dd>
- <dt><samp class="option">-c[:<var class="var">stream_specifier</var>] <var class="var">codec</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-codec[:<var class="var">stream_specifier</var>] <var class="var">codec</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Select an encoder (when used before an output file) or a decoder (when used
- before an input file) for one or more streams. <var class="var">codec</var> is the name of a
- decoder/encoder or a special value <code class="code">copy</code> (output only) to indicate that
- the stream is not to be re-encoded.
- </p>
- <p>For example
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
- </pre></div>
- <p>encodes all video streams with libx264 and copies all audio streams.
- </p>
- <p>For each stream, the last matching <code class="code">c</code> option is applied, so
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
- </pre></div>
- <p>will copy all the streams except the second video, which will be encoded with
- libx264, and the 138th audio, which will be encoded with libvorbis.
- </p>
- </dd>
- <dt><samp class="option">-t <var class="var">duration</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>When used as an input option (before <code class="code">-i</code>), limit the <var class="var">duration</var> of
- data read from the input file.
- </p>
- <p>When used as an output option (before an output url), stop writing the
- output after its duration reaches <var class="var">duration</var>.
- </p>
- <p><var class="var">duration</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>-to and -t are mutually exclusive and -t has priority.
- </p>
- </dd>
- <dt><samp class="option">-to <var class="var">position</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Stop writing the output or reading the input at <var class="var">position</var>.
- <var class="var">position</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>-to and -t are mutually exclusive and -t has priority.
- </p>
- </dd>
- <dt><samp class="option">-fs <var class="var">limit_size</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the file size limit, expressed in bytes. No further chunk of bytes is written
- after the limit is exceeded. The size of the output file is slightly more than the
- requested file size.
- </p>
- </dd>
- <dt><samp class="option">-ss <var class="var">position</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>When used as an input option (before <code class="code">-i</code>), seeks in this input file to
- <var class="var">position</var>. Note that in most formats it is not possible to seek exactly,
- so <code class="command">ffmpeg</code> will seek to the closest seek point before <var class="var">position</var>.
- When transcoding and <samp class="option">-accurate_seek</samp> is enabled (the default), this
- extra segment between the seek point and <var class="var">position</var> will be decoded and
- discarded. When doing stream copy or when <samp class="option">-noaccurate_seek</samp> is used, it
- will be preserved.
- </p>
- <p>When used as an output option (before an output url), decodes but discards
- input until the timestamps reach <var class="var">position</var>.
- </p>
- <p><var class="var">position</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- </dd>
- <dt><samp class="option">-sseof <var class="var">position</var> (<em class="emph">input</em>)</samp></dt>
- <dd>
- <p>Like the <code class="code">-ss</code> option but relative to the "end of file". That is negative
- values are earlier in the file, 0 is at EOF.
- </p>
- </dd>
- <dt><samp class="option">-isync <var class="var">input_index</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Assign an input as a sync source.
- </p>
- <p>This will take the difference between the start times of the target and reference inputs and
- offset the timestamps of the target file by that difference. The source timestamps of the two
- inputs should derive from the same clock source for expected results. If <code class="code">copyts</code> is set
- then <code class="code">start_at_zero</code> must also be set. If either of the inputs has no starting timestamp
- then no sync adjustment is made.
- </p>
- <p>Acceptable values are those that refer to a valid ffmpeg input index. If the sync reference is
- the target index itself or <var class="var">-1</var>, then no adjustment is made to target timestamps. A sync
- reference may not itself be synced to any other input.
- </p>
- <p>Default value is <var class="var">-1</var>.
- </p>
- </dd>
- <dt><samp class="option">-itsoffset <var class="var">offset</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set the input time offset.
- </p>
- <p><var class="var">offset</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>The offset is added to the timestamps of the input files. Specifying
- a positive offset means that the corresponding streams are delayed by
- the time duration specified in <var class="var">offset</var>.
- </p>
- </dd>
- <dt><samp class="option">-itsscale <var class="var">scale</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Rescale input timestamps. <var class="var">scale</var> should be a floating point number.
- </p>
- </dd>
- <dt><samp class="option">-timestamp <var class="var">date</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the recording timestamp in the container.
- </p>
- <p><var class="var">date</var> must be a date specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#date-syntax">the Date section in the ffmpeg-utils(1) manual</a>.
- </p>
- </dd>
- <dt><samp class="option">-metadata[:metadata_specifier] <var class="var">key</var>=<var class="var">value</var> (<em class="emph">output,per-metadata</em>)</samp></dt>
- <dd><p>Set a metadata key/value pair.
- </p>
- <p>An optional <var class="var">metadata_specifier</var> may be given to set metadata
- on streams, chapters or programs. See <code class="code">-map_metadata</code>
- documentation for details.
- </p>
- <p>This option overrides metadata set with <code class="code">-map_metadata</code>. It is
- also possible to delete metadata by using an empty value.
- </p>
- <p>For example, for setting the title in the output file:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -metadata title="my title" out.flv
- </pre></div>
- <p>To set the language of the first audio stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -metadata:s:a:0 language=eng OUTPUT
- </pre></div>
- </dd>
- <dt><samp class="option">-disposition[:stream_specifier] <var class="var">value</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Sets the disposition flags for a stream.
- </p>
- <p>Default value: by default, all disposition flags are copied from the input stream,
- unless the output stream this option applies to is fed by a complex filtergraph
- - in that case no disposition flags are set by default.
- </p>
- <p><var class="var">value</var> is a sequence of disposition flags separated by ’+’ or ’-’. A ’+’
- prefix adds the given disposition, ’-’ removes it. If the first flag is also
- prefixed with ’+’ or ’-’, the resulting disposition is the default value
- updated by <var class="var">value</var>. If the first flag is not prefixed, the resulting
- disposition is <var class="var">value</var>. It is also possible to clear the disposition by
- setting it to 0.
- </p>
- <p>If no <code class="code">-disposition</code> options were specified for an output file, ffmpeg will
- automatically set the ’default’ disposition flag on the first stream of each type,
- when there are multiple streams of this type in the output file and no stream of
- that type is already marked as default.
- </p>
- <p>The <code class="code">-dispositions</code> option lists the known disposition flags.
- </p>
- <p>For example, to make the second audio stream the default stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c copy -disposition:a:1 default out.mkv
- </pre></div>
- <p>To make the second subtitle stream the default stream and remove the default
- disposition from the first subtitle stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c copy -disposition:s:0 0 -disposition:s:1 default out.mkv
- </pre></div>
- <p>To add an embedded cover/thumbnail:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mp4 -i IMAGE -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attached_pic out.mp4
- </pre></div>
- <p>To add the ’original’ and remove the ’comment’ disposition flag from the first
- audio stream without removing its other disposition flags:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c copy -disposition:a:0 +original-comment out.mkv
- </pre></div>
- <p>To remove the ’original’ and add the ’comment’ disposition flag to the first
- audio stream without removing its other disposition flags:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c copy -disposition:a:0 -original+comment out.mkv
- </pre></div>
- <p>To set only the ’original’ and ’comment’ disposition flags on the first audio
- stream (and remove its other disposition flags):
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c copy -disposition:a:0 original+comment out.mkv
- </pre></div>
- <p>To remove all disposition flags from the first audio stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c copy -disposition:a:0 0 out.mkv
- </pre></div>
- <p>Not all muxers support embedded thumbnails, and those who do, only support a few formats, like JPEG or PNG.
- </p>
- </dd>
- <dt><samp class="option">-program [title=<var class="var">title</var>:][program_num=<var class="var">program_num</var>:]st=<var class="var">stream</var>[:st=<var class="var">stream</var>...] (<em class="emph">output</em>)</samp></dt>
- <dd>
- <p>Creates a program with the specified <var class="var">title</var>, <var class="var">program_num</var> and adds the specified
- <var class="var">stream</var>(s) to it.
- </p>
- </dd>
- <dt><samp class="option">-stream_group [map=<var class="var">input_file_id</var>=<var class="var">stream_group</var>][type=<var class="var">type</var>:]st=<var class="var">stream</var>[:st=<var class="var">stream</var>][:stg=<var class="var">stream_group</var>][:id=<var class="var">stream_group_id</var>...] (<em class="emph">output</em>)</samp></dt>
- <dd>
- <p>Creates a stream group of the specified <var class="var">type</var> and <var class="var">stream_group_id</var>, or by
- <var class="var">map</var>ping an input group, adding the specified <var class="var">stream</var>(s) and/or previously
- defined <var class="var">stream_group</var>(s) to it.
- </p>
- <p><var class="var">type</var> can be one of the following:
- </p><dl class="table">
- <dt><samp class="option">iamf_audio_element</samp></dt>
- <dd><p>Groups <var class="var">stream</var>s that belong to the same IAMF Audio Element
- </p>
- <p>For this group <var class="var">type</var>, the following options are available
- </p><dl class="table">
- <dt><samp class="option">audio_element_type</samp></dt>
- <dd><p>The Audio Element type. The following values are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">channel</samp></dt>
- <dd><p>Scalable channel audio representation
- </p></dd>
- <dt><samp class="option">scene</samp></dt>
- <dd><p>Ambisonics representation
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">demixing</samp></dt>
- <dd><p>Demixing information used to reconstruct a scalable channel audio representation.
- This option must be separated from the rest with a ’,’, and takes the following
- key=value options
- </p>
- <dl class="table">
- <dt><samp class="option">parameter_id</samp></dt>
- <dd><p>An identifier parameters blocks in frames may refer to
- </p></dd>
- <dt><samp class="option">dmixp_mode</samp></dt>
- <dd><p>A pre-defined combination of demixing parameters
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">recon_gain</samp></dt>
- <dd><p>Recon gain information used to reconstruct a scalable channel audio representation.
- This option must be separated from the rest with a ’,’, and takes the following
- key=value options
- </p>
- <dl class="table">
- <dt><samp class="option">parameter_id</samp></dt>
- <dd><p>An identifier parameters blocks in frames may refer to
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">layer</samp></dt>
- <dd><p>A layer defining a Channel Layout in the Audio Element.
- This option must be separated from the rest with a ’,’. Several ’,’ separated entries
- can be defined, and at least one must be set.
- </p>
- <p>It takes the following ":"-separated key=value options
- </p>
- <dl class="table">
- <dt><samp class="option">ch_layout</samp></dt>
- <dd><p>The layer’s channel layout
- </p></dd>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>The following flags are available:
- </p>
- <dl class="table">
- <dt><samp class="option">recon_gain</samp></dt>
- <dd><p>Whether to signal if recon_gain is present as metadata in parameter blocks within frames
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">output_gain</samp></dt>
- <dt><samp class="option">output_gain_flags</samp></dt>
- <dd><p>Which channels output_gain applies to. The following flags are available:
- </p>
- <dl class="table">
- <dt><samp class="option">FL</samp></dt>
- <dt><samp class="option">FR</samp></dt>
- <dt><samp class="option">BL</samp></dt>
- <dt><samp class="option">BR</samp></dt>
- <dt><samp class="option">TFL</samp></dt>
- <dt><samp class="option">TFR</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">ambisonics_mode</samp></dt>
- <dd><p>The ambisonics mode. This has no effect if audio_element_type is set to channel.
- </p>
- <p>The following values are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">mono</samp></dt>
- <dd><p>Each ambisonics channel is coded as an individual mono stream in the group
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">default_w</samp></dt>
- <dd><p>Default weight value
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">iamf_mix_presentation</samp></dt>
- <dd><p>Groups <var class="var">stream</var>s that belong to all IAMF Audio Element the same
- IAMF Mix Presentation references
- </p>
- <p>For this group <var class="var">type</var>, the following options are available
- </p>
- <dl class="table">
- <dt><samp class="option">submix</samp></dt>
- <dd><p>A sub-mix within the Mix Presentation.
- This option must be separated from the rest with a ’,’. Several ’,’ separated entries
- can be defined, and at least one must be set.
- </p>
- <p>It takes the following ":"-separated key=value options
- </p>
- <dl class="table">
- <dt><samp class="option">parameter_id</samp></dt>
- <dd><p>An identifier parameters blocks in frames may refer to, for post-processing the mixed
- audio signal to generate the audio signal for playback
- </p></dd>
- <dt><samp class="option">parameter_rate</samp></dt>
- <dd><p>The sample rate duration fields in parameters blocks in frames that refer to this
- <var class="var">parameter_id</var> are expressed as
- </p></dd>
- <dt><samp class="option">default_mix_gain</samp></dt>
- <dd><p>Default mix gain value to apply when there are no parameter blocks sharing the same
- <var class="var">parameter_id</var> for a given frame
- </p>
- </dd>
- <dt><samp class="option">element</samp></dt>
- <dd><p>References an Audio Element used in this Mix Presentation to generate the final output
- audio signal for playback.
- This option must be separated from the rest with a ’|’. Several ’|’ separated entries
- can be defined, and at least one must be set.
- </p>
- <p>It takes the following ":"-separated key=value options:
- </p>
- <dl class="table">
- <dt><samp class="option">stg</samp></dt>
- <dd><p>The <var class="var">stream_group_id</var> for an Audio Element which this sub-mix refers to
- </p></dd>
- <dt><samp class="option">parameter_id</samp></dt>
- <dd><p>An identifier parameters blocks in frames may refer to, for applying any processing to
- the referenced and rendered Audio Element before being summed with other processed Audio
- Elements
- </p></dd>
- <dt><samp class="option">parameter_rate</samp></dt>
- <dd><p>The sample rate duration fields in parameters blocks in frames that refer to this
- <var class="var">parameter_id</var> are expressed as
- </p></dd>
- <dt><samp class="option">default_mix_gain</samp></dt>
- <dd><p>Default mix gain value to apply when there are no parameter blocks sharing the same
- <var class="var">parameter_id</var> for a given frame
- </p></dd>
- <dt><samp class="option">annotations</samp></dt>
- <dd><p>A key=value string describing the sub-mix element where "key" is a string conforming to
- BCP-47 that specifies the language for the "value" string. "key" must be the same as the
- one in the mix’s <var class="var">annotations</var>
- </p></dd>
- <dt><samp class="option">headphones_rendering_mode</samp></dt>
- <dd><p>Indicates whether the input channel-based Audio Element is rendered to stereo loudspeakers
- or spatialized with a binaural renderer when played back on headphones.
- This has no effect if the referenced Audio Element’s <var class="var">audio_element_type</var> is set to
- channel.
- </p>
- <p>The following values are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">stereo</samp></dt>
- <dt><samp class="option">binaural</samp></dt>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">layout</samp></dt>
- <dd><p>Specifies the layouts for this sub-mix on which the loudness information was measured.
- This option must be separated from the rest with a ’|’. Several ’|’ separated entries
- can be defined, and at least one must be set.
- </p>
- <p>It takes the following ":"-separated key=value options:
- </p>
- <dl class="table">
- <dt><samp class="option">layout_type</samp></dt>
- <dd>
- <dl class="table">
- <dt><samp class="option">loudspeakers</samp></dt>
- <dd><p>The layout follows the loudspeaker sound system convention of ITU-2051-3.
- </p></dd>
- <dt><samp class="option">binaural</samp></dt>
- <dd><p>The layout is binaural.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">sound_system</samp></dt>
- <dd><p>Channel layout matching one of Sound Systems A to J of ITU-2051-3, plus 7.1.2 and 3.1.2
- This has no effect if <var class="var">layout_type</var> is set to binaural.
- </p></dd>
- <dt><samp class="option">integrated_loudness</samp></dt>
- <dd><p>The program integrated loudness information, as defined in ITU-1770-4.
- </p></dd>
- <dt><samp class="option">digital_peak</samp></dt>
- <dd><p>The digital (sampled) peak value of the audio signal, as defined in ITU-1770-4.
- </p></dd>
- <dt><samp class="option">true_peak</samp></dt>
- <dd><p>The true peak of the audio signal, as defined in ITU-1770-4.
- </p></dd>
- <dt><samp class="option">dialog_anchored_loudness</samp></dt>
- <dd><p>The Dialogue loudness information, as defined in ITU-1770-4.
- </p></dd>
- <dt><samp class="option">album_anchored_loudness</samp></dt>
- <dd><p>The Album loudness information, as defined in ITU-1770-4.
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">annotations</samp></dt>
- <dd><p>A key=value string string describing the mix where "key" is a string conforming to BCP-47
- that specifies the language for the "value" string. "key" must be the same as the ones in
- all sub-mix element’s <var class="var">annotations</var>s
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>E.g. to create an scalable 5.1 IAMF file from several WAV input files
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i front.wav -i back.wav -i center.wav -i lfe.wav
- -map 0:0 -map 1:0 -map 2:0 -map 3:0 -c:a opus
- -stream_group type=iamf_audio_element:id=1:st=0:st=1:st=2:st=3,
- demixing=parameter_id=998,
- recon_gain=parameter_id=101,
- layer=ch_layout=stereo,
- layer=ch_layout=5.1(side),
- -stream_group type=iamf_mix_presentation:id=2:stg=0:annotations=en-us=Mix_Presentation,
- submix=parameter_id=100:parameter_rate=48000|element=stg=0:parameter_id=100:annotations=en-us=Scalable_Submix|layout=sound_system=stereo|layout=sound_system=5.1(side)
- -streamid 0:0 -streamid 1:1 -streamid 2:2 -streamid 3:3 output.iamf
- </pre></div>
- <p>To copy the two stream groups (Audio Element and Mix Presentation) from an input IAMF file with four
- streams into an mp4 output
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.iamf -c:a copy -stream_group map=0=0:st=0:st=1:st=2:st=3 -stream_group map=0=1:stg=0
- -streamid 0:0 -streamid 1:1 -streamid 2:2 -streamid 3:3 output.mp4
- </pre></div>
- </dd>
- <dt><samp class="option">-target <var class="var">type</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Specify target file type (<code class="code">vcd</code>, <code class="code">svcd</code>, <code class="code">dvd</code>, <code class="code">dv</code>,
- <code class="code">dv50</code>). <var class="var">type</var> may be prefixed with <code class="code">pal-</code>, <code class="code">ntsc-</code> or
- <code class="code">film-</code> to use the corresponding standard. All the format options
- (bitrate, codecs, buffer sizes) are then set automatically. You can just type:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
- </pre></div>
- <p>Nevertheless you can specify additional options as long as you know
- they do not conflict with the standard, as in:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
- </pre></div>
- <p>The parameters set for each target are as follows.
- </p>
- <p><strong class="strong">VCD</strong>
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">pal</var>:
- -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
- -s 352x288 -r 25
- -codec:v mpeg1video -g 15 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
- -ar 44100 -ac 2
- -codec:a mp2 -b:a 224k
- <var class="var">ntsc</var>:
- -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
- -s 352x240 -r 30000/1001
- -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
- -ar 44100 -ac 2
- -codec:a mp2 -b:a 224k
- <var class="var">film</var>:
- -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
- -s 352x240 -r 24000/1001
- -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
- -ar 44100 -ac 2
- -codec:a mp2 -b:a 224k
- </pre></div>
- <p><strong class="strong">SVCD</strong>
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">pal</var>:
- -f svcd -packetsize 2324
- -s 480x576 -pix_fmt yuv420p -r 25
- -codec:v mpeg2video -g 15 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
- -ar 44100
- -codec:a mp2 -b:a 224k
- <var class="var">ntsc</var>:
- -f svcd -packetsize 2324
- -s 480x480 -pix_fmt yuv420p -r 30000/1001
- -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
- -ar 44100
- -codec:a mp2 -b:a 224k
- <var class="var">film</var>:
- -f svcd -packetsize 2324
- -s 480x480 -pix_fmt yuv420p -r 24000/1001
- -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
- -ar 44100
- -codec:a mp2 -b:a 224k
- </pre></div>
- <p><strong class="strong">DVD</strong>
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">pal</var>:
- -f dvd -muxrate 10080k -packetsize 2048
- -s 720x576 -pix_fmt yuv420p -r 25
- -codec:v mpeg2video -g 15 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
- -ar 48000
- -codec:a ac3 -b:a 448k
- <var class="var">ntsc</var>:
- -f dvd -muxrate 10080k -packetsize 2048
- -s 720x480 -pix_fmt yuv420p -r 30000/1001
- -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
- -ar 48000
- -codec:a ac3 -b:a 448k
- <var class="var">film</var>:
- -f dvd -muxrate 10080k -packetsize 2048
- -s 720x480 -pix_fmt yuv420p -r 24000/1001
- -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
- -ar 48000
- -codec:a ac3 -b:a 448k
- </pre></div>
- <p><strong class="strong">DV</strong>
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">pal</var>:
- -f dv
- -s 720x576 -pix_fmt yuv420p -r 25
- -ar 48000 -ac 2
- <var class="var">ntsc</var>:
- -f dv
- -s 720x480 -pix_fmt yuv411p -r 30000/1001
- -ar 48000 -ac 2
- <var class="var">film</var>:
- -f dv
- -s 720x480 -pix_fmt yuv411p -r 24000/1001
- -ar 48000 -ac 2
- </pre></div>
- <p>The <code class="code">dv50</code> target is identical to the <code class="code">dv</code> target except that the pixel format set is <code class="code">yuv422p</code> for all three standards.
- </p>
- <p>Any user-set value for a parameter above will override the target preset value. In that case, the output may
- not comply with the target standard.
- </p>
- </dd>
- <dt><samp class="option">-dn (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>As an input option, blocks all data streams of a file from being filtered or
- being automatically selected or mapped for any output. See <code class="code">-discard</code>
- option to disable streams individually.
- </p>
- <p>As an output option, disables data recording i.e. automatic selection or
- mapping of any data stream. For full manual control see the <code class="code">-map</code>
- option.
- </p>
- </dd>
- <dt><samp class="option">-dframes <var class="var">number</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the number of data frames to output. This is an obsolete alias for
- <code class="code">-frames:d</code>, which you should use instead.
- </p>
- </dd>
- <dt><samp class="option">-frames[:<var class="var">stream_specifier</var>] <var class="var">framecount</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Stop writing to the stream after <var class="var">framecount</var> frames.
- </p>
- </dd>
- <dt><samp class="option">-q[:<var class="var">stream_specifier</var>] <var class="var">q</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-qscale[:<var class="var">stream_specifier</var>] <var class="var">q</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Use fixed quality scale (VBR). The meaning of <var class="var">q</var>/<var class="var">qscale</var> is
- codec-dependent.
- If <var class="var">qscale</var> is used without a <var class="var">stream_specifier</var> then it applies only
- to the video stream, this is to maintain compatibility with previous behavior
- and as specifying the same codec specific value to 2 different codecs that is
- audio and video generally is not what is intended when no stream_specifier is
- used.
- </p>
- <a class="anchor" id="filter_005foption"></a></dd>
- <dt><samp class="option">-filter[:<var class="var">stream_specifier</var>] <var class="var">filtergraph</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Create the filtergraph specified by <var class="var">filtergraph</var> and use it to
- filter the stream.
- </p>
- <p><var class="var">filtergraph</var> is a description of the filtergraph to apply to
- the stream, and must have a single input and a single output of the
- same type of the stream. In the filtergraph, the input is associated
- to the label <code class="code">in</code>, and the output to the label <code class="code">out</code>. See
- the ffmpeg-filters manual for more information about the filtergraph
- syntax.
- </p>
- <p>See the <a class="ref" href="#filter_005fcomplex_005foption">-filter_complex option</a> if you
- want to create filtergraphs with multiple inputs and/or outputs.
- </p>
- </dd>
- <dt><samp class="option">-reinit_filter[:<var class="var">stream_specifier</var>] <var class="var">integer</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>This boolean option determines if the filtergraph(s) to which this stream is fed gets
- reinitialized when input frame parameters change mid-stream. This option is enabled by
- default as most video and all audio filters cannot handle deviation in input frame properties.
- Upon reinitialization, existing filter state is lost, like e.g. the frame count <code class="code">n</code>
- reference available in some filters. Any frames buffered at time of reinitialization are lost.
- The properties where a change triggers reinitialization are,
- for video, frame resolution or pixel format;
- for audio, sample format, sample rate, channel count or channel layout.
- </p>
- </dd>
- <dt><samp class="option">-drop_changed[:<var class="var">stream_specifier</var>] <var class="var">integer</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>This boolean option determines whether a frame with differing frame parameters mid-stream
- gets dropped instead of leading to filtergraph reinitialization, as that would lead to loss
- of filter state. Generally useful to avoid corrupted yet decodable packets in live streaming
- inputs. Default is false.
- </p>
- </dd>
- <dt><samp class="option">-filter_threads <var class="var">nb_threads</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Defines how many threads are used to process a filter pipeline. Each pipeline
- will produce a thread pool with this many threads available for parallel processing.
- The default is the number of available CPUs.
- </p>
- </dd>
- <dt><samp class="option">-filter_buffered_frames <var class="var">nb_frames</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Defines the maximum number of buffered frames allowed in a filtergraph. Under
- normal circumstances, a filtergraph should not buffer more than a few frames,
- especially if frames are being fed to it and read from it in a balanced way
- (which is the intended behavior in ffmpeg). That said, this option allows you
- to limit the total number of frames buffered across all links in a filtergraph.
- If more frames are generated, filtering is aborted and an error is returned.
- The default value is 0, which means no limit.
- </p>
- </dd>
- <dt><samp class="option">-pre[:<var class="var">stream_specifier</var>] <var class="var">preset_name</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Specify the preset for matching stream(s).
- </p>
- </dd>
- <dt><samp class="option">-stats (<em class="emph">global</em>)</samp></dt>
- <dd><p>Log encoding progress/statistics as "info"-level log (see <code class="code">-loglevel</code>).
- It is on by default, to explicitly disable it you need to specify <code class="code">-nostats</code>.
- </p>
- </dd>
- <dt><samp class="option">-stats_period <var class="var">time</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Set period at which encoding progress/statistics are updated. Default is 0.5 seconds.
- </p>
- </dd>
- <dt><samp class="option">-print_graphs (<em class="emph">global</em>)</samp></dt>
- <dd><p>Prints execution graph details to stderr in the format set via -print_graphs_format.
- </p>
- </dd>
- <dt><samp class="option">-print_graphs_file <var class="var">filename</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Writes execution graph details to the specified file in the format set via -print_graphs_format.
- </p>
- </dd>
- <dt><samp class="option">-print_graphs_format <var class="var">format</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Sets the output format (available formats are: default, compact, csv, flat, ini, json, xml, mermaid, mermaidhtml)
- The default format is json.
- </p>
- </dd>
- <dt><samp class="option">-progress <var class="var">url</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Send program-friendly progress information to <var class="var">url</var>.
- </p>
- <p>Progress information is written periodically and at the end of
- the encoding process. It is made of "<var class="var">key</var>=<var class="var">value</var>" lines. <var class="var">key</var>
- consists of only alphanumeric characters. The last key of a sequence of
- progress information is always "progress" with the value "continue" or "end".
- </p>
- <p>The update period is set using <code class="code">-stats_period</code>.
- </p>
- <p>For example, log progress information to stdout:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -progress pipe:1 -i in.mkv out.mkv
- </pre></div>
- <a class="anchor" id="stdin-option"></a></dd>
- <dt><samp class="option">-stdin</samp></dt>
- <dd><p>Enable interaction on standard input. On by default unless standard input is
- used as an input. To explicitly disable interaction you need to specify
- <code class="code">-nostdin</code>.
- </p>
- <p>Disabling interaction on standard input is useful, for example, if
- ffmpeg is in the background process group. Roughly the same result can
- be achieved with <code class="code">ffmpeg ... < /dev/null</code> but it requires a
- shell.
- </p>
- </dd>
- <dt><samp class="option">-debug_ts (<em class="emph">global</em>)</samp></dt>
- <dd><p>Print timestamp/latency information. It is off by default. This option is
- mostly useful for testing and debugging purposes, and the output
- format may change from one version to another, so it should not be
- employed by portable scripts.
- </p>
- <p>See also the option <code class="code">-fdebug ts</code>.
- </p>
- </dd>
- <dt><samp class="option">-attach <var class="var">filename</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Add an attachment to the output file. This is supported by a few formats
- like Matroska for e.g. fonts used in rendering subtitles. Attachments
- are implemented as a specific type of stream, so this option will add
- a new stream to the file. It is then possible to use per-stream options
- on this stream in the usual way. Attachment streams created with this
- option will be created after all the other streams (i.e. those created
- with <code class="code">-map</code> or automatic mappings).
- </p>
- <p>Note that for Matroska you also have to set the mimetype metadata tag:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv
- </pre></div>
- <p>(assuming that the attachment stream will be third in the output file).
- </p>
- </dd>
- <dt><samp class="option">-dump_attachment[:<var class="var">stream_specifier</var>] <var class="var">filename</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Extract the matching attachment stream into a file named <var class="var">filename</var>. If
- <var class="var">filename</var> is empty, then the value of the <code class="code">filename</code> metadata tag
- will be used.
- </p>
- <p>E.g. to extract the first attachment to a file named ’out.ttf’:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -dump_attachment:t:0 out.ttf -i INPUT
- </pre></div>
- <p>To extract all attachments to files determined by the <code class="code">filename</code> tag:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -dump_attachment:t "" -i INPUT
- </pre></div>
- <p>Technical note – attachments are implemented as codec extradata, so this
- option can actually be used to extract extradata from any stream, not just
- attachments.
- </p></dd>
- </dl>
- <a name="Video-Options"></a>
- <h3 class="section">5.5 Video Options<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-vframes <var class="var">number</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the number of video frames to output. This is an obsolete alias for
- <code class="code">-frames:v</code>, which you should use instead.
- </p></dd>
- <dt><samp class="option">-r[:<var class="var">stream_specifier</var>] <var class="var">fps</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Set frame rate (Hz value, fraction or abbreviation).
- </p>
- <p>As an input option, ignore any timestamps stored in the file and instead
- generate timestamps assuming constant frame rate <var class="var">fps</var>.
- This is not the same as the <samp class="option">-framerate</samp> option used for some input formats
- like image2 or v4l2 (it used to be the same in older versions of FFmpeg).
- If in doubt use <samp class="option">-framerate</samp> instead of the input option <samp class="option">-r</samp>.
- </p>
- <p>As an output option:
- </p><dl class="table">
- <dt><samp class="option">video encoding</samp></dt>
- <dd><p>Duplicate or drop frames right before encoding them to achieve constant output
- frame rate <var class="var">fps</var>.
- </p>
- </dd>
- <dt><samp class="option">video streamcopy</samp></dt>
- <dd><p>Indicate to the muxer that <var class="var">fps</var> is the stream frame rate. No data is
- dropped or duplicated in this case. This may produce invalid files if <var class="var">fps</var>
- does not match the actual stream frame rate as determined by packet timestamps.
- See also the <code class="code">setts</code> bitstream filter.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">-fpsmax[:<var class="var">stream_specifier</var>] <var class="var">fps</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Set maximum frame rate (Hz value, fraction or abbreviation).
- </p>
- <p>Clamps output frame rate when output framerate is auto-set and is higher than this value.
- Useful in batch processing or when input framerate is wrongly detected as very high.
- It cannot be set together with <code class="code">-r</code>. It is ignored during streamcopy.
- </p>
- </dd>
- <dt><samp class="option">-s[:<var class="var">stream_specifier</var>] <var class="var">size</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Set frame size.
- </p>
- <p>As an input option, this is a shortcut for the <samp class="option">video_size</samp> private
- option, recognized by some demuxers for which the frame size is either not
- stored in the file or is configurable – e.g. raw video or video grabbers.
- </p>
- <p>As an output option, this inserts the <code class="code">scale</code> video filter to the
- <em class="emph">end</em> of the corresponding filtergraph. Please use the <code class="code">scale</code> filter
- directly to insert it at the beginning or some other place.
- </p>
- <p>The format is ‘<samp class="samp">wxh</samp>’ (default - same as source).
- </p>
- </dd>
- <dt><samp class="option">-aspect[:<var class="var">stream_specifier</var>] <var class="var">aspect</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Set the video display aspect ratio specified by <var class="var">aspect</var>.
- </p>
- <p><var class="var">aspect</var> can be a floating point number string, or a string of the
- form <var class="var">num</var>:<var class="var">den</var>, where <var class="var">num</var> and <var class="var">den</var> are the
- numerator and denominator of the aspect ratio. For example "4:3",
- "16:9", "1.3333", and "1.7777" are valid argument values.
- </p>
- <p>If used together with <samp class="option">-vcodec copy</samp>, it will affect the aspect ratio
- stored at container level, but not the aspect ratio stored in encoded
- frames, if it exists.
- </p>
- </dd>
- <dt><samp class="option">-display_rotation[:<var class="var">stream_specifier</var>] <var class="var">rotation</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Set video rotation metadata.
- </p>
- <p><var class="var">rotation</var> is a decimal number specifying the amount in degree by
- which the video should be rotated counter-clockwise before being
- displayed.
- </p>
- <p>This option overrides the rotation/display transform metadata stored in
- the file, if any. When the video is being transcoded (rather than
- copied) and <code class="code">-autorotate</code> is enabled, the video will be rotated at
- the filtering stage. Otherwise, the metadata will be written into the
- output file if the muxer supports it.
- </p>
- <p>If the <code class="code">-display_hflip</code> and/or <code class="code">-display_vflip</code> options are
- given, they are applied after the rotation specified by this option.
- </p>
- </dd>
- <dt><samp class="option">-display_hflip[:<var class="var">stream_specifier</var>] (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Set whether on display the image should be horizontally flipped.
- </p>
- <p>See the <code class="code">-display_rotation</code> option for more details.
- </p>
- </dd>
- <dt><samp class="option">-display_vflip[:<var class="var">stream_specifier</var>] (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Set whether on display the image should be vertically flipped.
- </p>
- <p>See the <code class="code">-display_rotation</code> option for more details.
- </p>
- </dd>
- <dt><samp class="option">-vn (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>As an input option, blocks all video streams of a file from being filtered or
- being automatically selected or mapped for any output. See <code class="code">-discard</code>
- option to disable streams individually.
- </p>
- <p>As an output option, disables video recording i.e. automatic selection or
- mapping of any video stream. For full manual control see the <code class="code">-map</code>
- option.
- </p>
- </dd>
- <dt><samp class="option">-vcodec <var class="var">codec</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the video codec. This is an alias for <code class="code">-codec:v</code>.
- </p>
- </dd>
- <dt><samp class="option">-pass[:<var class="var">stream_specifier</var>] <var class="var">n</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Select the pass number (1 or 2). It is used to do two-pass
- video encoding. The statistics of the video are recorded in the first
- pass into a log file (see also the option -passlogfile),
- and in the second pass that log file is used to generate the video
- at the exact requested bitrate.
- On pass 1, you may just deactivate audio and set output to null,
- examples for Windows and Unix:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
- ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
- </pre></div>
- </dd>
- <dt><samp class="option">-passlogfile[:<var class="var">stream_specifier</var>] <var class="var">prefix</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Set two-pass log file name prefix to <var class="var">prefix</var>, the default file name
- prefix is “ffmpeg2pass”. The complete file name will be
- <samp class="file">PREFIX-N.log</samp>, where N is a number specific to the output
- stream
- </p>
- </dd>
- <dt><samp class="option">-vf <var class="var">filtergraph</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Create the filtergraph specified by <var class="var">filtergraph</var> and use it to
- filter the stream.
- </p>
- <p>This is an alias for <code class="code">-filter:v</code>, see the <a class="ref" href="#filter_005foption">-filter option</a>.
- </p>
- </dd>
- <dt><samp class="option">-autorotate</samp></dt>
- <dd><p>Automatically rotate the video according to file metadata. Enabled by
- default, use <samp class="option">-noautorotate</samp> to disable it.
- </p>
- </dd>
- <dt><samp class="option">-autoscale</samp></dt>
- <dd><p>Automatically scale the video according to the resolution of first frame.
- Enabled by default, use <samp class="option">-noautoscale</samp> to disable it. When autoscale is
- disabled, all output frames of filter graph might not be in the same resolution
- and may be inadequate for some encoder/muxer. Therefore, it is not recommended
- to disable it unless you really know what you are doing.
- Disable autoscale at your own risk.
- </p></dd>
- </dl>
- <a name="Advanced-Video-options"></a>
- <h3 class="section">5.6 Advanced Video options<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-Video-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-Video-options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-pix_fmt[:<var class="var">stream_specifier</var>] <var class="var">format</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Set pixel format. Use <code class="code">-pix_fmts</code> to show all the supported
- pixel formats.
- If the selected pixel format can not be selected, ffmpeg will print a
- warning and select the best pixel format supported by the encoder.
- If <var class="var">pix_fmt</var> is prefixed by a <code class="code">+</code>, ffmpeg will exit with an error
- if the requested pixel format can not be selected, and automatic conversions
- inside filtergraphs are disabled.
- If <var class="var">pix_fmt</var> is a single <code class="code">+</code>, ffmpeg selects the same pixel format
- as the input (or graph output) and automatic conversions are disabled.
- </p>
- </dd>
- <dt><samp class="option">-sws_flags <var class="var">flags</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Set default flags for the libswscale library. These flags are used by
- automatically inserted <code class="code">scale</code> filters and those within simple
- filtergraphs, if not overridden within the filtergraph definition.
- </p>
- <p>See the <a data-manual="ffmpeg-scaler" href="ffmpeg-scaler.html#scaler_005foptions">ffmpeg-scaler manual</a> for a list
- of scaler options.
- </p>
- </dd>
- <dt><samp class="option">-rc_override[:<var class="var">stream_specifier</var>] <var class="var">override</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Rate control override for specific intervals, formatted as "int,int,int"
- list separated with slashes. Two first values are the beginning and
- end frame numbers, last one is quantizer to use if positive, or quality
- factor if negative.
- </p>
- </dd>
- <dt><samp class="option">-vstats</samp></dt>
- <dd><p>Dump video coding statistics to <samp class="file">vstats_HHMMSS.log</samp>. See the
- <a class="ref" href="#vstats_005ffile_005fformat">vstats file format</a> section for the format description.
- </p>
- </dd>
- <dt><samp class="option">-vstats_file <var class="var">file</var></samp></dt>
- <dd><p>Dump video coding statistics to <var class="var">file</var>. See the
- <a class="ref" href="#vstats_005ffile_005fformat">vstats file format</a> section for the format description.
- </p>
- </dd>
- <dt><samp class="option">-vstats_version <var class="var">file</var></samp></dt>
- <dd><p>Specify which version of the vstats format to use. Default is <code class="code">2</code>. See the
- <a class="ref" href="#vstats_005ffile_005fformat">vstats file format</a> section for the format description.
- </p>
- </dd>
- <dt><samp class="option">-vtag <var class="var">fourcc/tag</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Force video tag/fourcc. This is an alias for <code class="code">-tag:v</code>.
- </p>
- </dd>
- <dt><samp class="option">-force_key_frames[:<var class="var">stream_specifier</var>] <var class="var">time</var>[,<var class="var">time</var>...] (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-force_key_frames[:<var class="var">stream_specifier</var>] expr:<var class="var">expr</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-force_key_frames[:<var class="var">stream_specifier</var>] source (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-force_key_frames[:<var class="var">stream_specifier</var>] scd_metadata (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd>
- <p><var class="var">force_key_frames</var> can take arguments of the following form:
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">time</var>[,<var class="var">time</var>...]</samp></dt>
- <dd><p>If the argument consists of timestamps, ffmpeg will round the specified times to the nearest
- output timestamp as per the encoder time base and force a keyframe at the first frame having
- timestamp equal or greater than the computed timestamp. Note that if the encoder time base is too
- coarse, then the keyframes may be forced on frames with timestamps lower than the specified time.
- The default encoder time base is the inverse of the output framerate but may be set otherwise
- via <code class="code">-enc_time_base</code>.
- </p>
- <p>If one of the times is "<code class="code">chapters</code>[<var class="var">delta</var>]", it is expanded into
- the time of the beginning of all chapters in the file, shifted by
- <var class="var">delta</var>, expressed as a time in seconds.
- This option can be useful to ensure that a seek point is present at a
- chapter mark or any other designated place in the output file.
- </p>
- <p>For example, to insert a key frame at 5 minutes, plus key frames 0.1 second
- before the beginning of every chapter:
- </p><div class="example">
- <pre class="example-preformatted">-force_key_frames 0:05:00,chapters-0.1
- </pre></div>
- </dd>
- <dt><samp class="option">expr:<var class="var">expr</var></samp></dt>
- <dd><p>If the argument is prefixed with <code class="code">expr:</code>, the string <var class="var">expr</var>
- is interpreted like an expression and is evaluated for each frame. A
- key frame is forced in case the evaluation is non-zero.
- </p>
- <p>The expression in <var class="var">expr</var> can contain the following constants:
- </p><dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>the number of current processed frame, starting from 0
- </p></dd>
- <dt><samp class="option">n_forced</samp></dt>
- <dd><p>the number of forced frames
- </p></dd>
- <dt><samp class="option">prev_forced_n</samp></dt>
- <dd><p>the number of the previous forced frame, it is <code class="code">NAN</code> when no
- keyframe was forced yet
- </p></dd>
- <dt><samp class="option">prev_forced_t</samp></dt>
- <dd><p>the time of the previous forced frame, it is <code class="code">NAN</code> when no
- keyframe was forced yet
- </p></dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>the time of the current processed frame
- </p></dd>
- </dl>
- <p>For example to force a key frame every 5 seconds, you can specify:
- </p><div class="example">
- <pre class="example-preformatted">-force_key_frames expr:gte(t,n_forced*5)
- </pre></div>
- <p>To force a key frame 5 seconds after the time of the last forced one,
- starting from second 13:
- </p><div class="example">
- <pre class="example-preformatted">-force_key_frames expr:if(isnan(prev_forced_t),gte(t,13),gte(t,prev_forced_t+5))
- </pre></div>
- </dd>
- <dt><samp class="option">source</samp></dt>
- <dd><p>If the argument is <code class="code">source</code>, ffmpeg will force a key frame if
- the current frame being encoded is marked as a key frame in its source.
- In cases where this particular source frame has to be dropped,
- enforce the next available frame to become a key frame instead.
- </p>
- </dd>
- <dt><samp class="option">scd_metadata</samp></dt>
- <dd><p>If the argument is <code class="code">scd_metadata</code>, ffmpeg will force a key frame if
- the current frame contains a metadata entry with the key <code class="code">lavfi.scd.time</code>.
- The metadata can be added by filters like <code class="code">scdet</code> and <code class="code">scdet_vulkan</code>.
- Avoid inserting filters that duplicate frames after <code class="code">scdet</code>, as this can
- cause duplicate metadata for multiple frames and repeated insertion of key
- frames.
- </p>
- </dd>
- </dl>
- <p>Note that forcing too many keyframes is very harmful for the lookahead
- algorithms of certain encoders: using fixed-GOP options or similar
- would be more efficient.
- </p>
- </dd>
- <dt><samp class="option">-apply_cropping[:<var class="var">stream_specifier</var>] <var class="var">source</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Automatically crop the video after decoding according to file metadata.
- Default is <em class="emph">all</em>.
- </p>
- <dl class="table">
- <dt><samp class="option">none (0)</samp></dt>
- <dd><p>Don’t apply any cropping metadata.
- </p></dd>
- <dt><samp class="option">all (1)</samp></dt>
- <dd><p>Apply both codec and container level croppping. This is the default mode.
- </p></dd>
- <dt><samp class="option">codec (2)</samp></dt>
- <dd><p>Apply codec level croppping.
- </p></dd>
- <dt><samp class="option">container (3)</samp></dt>
- <dd><p>Apply container level croppping.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-copyinkf[:<var class="var">stream_specifier</var>] (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>When doing stream copy, copy also non-key frames found at the
- beginning.
- </p>
- </dd>
- <dt><samp class="option">-init_hw_device <var class="var">type</var>[=<var class="var">name</var>][:<var class="var">device</var>[,<var class="var">key=value</var>...]]</samp></dt>
- <dd><p>Initialise a new hardware device of type <var class="var">type</var> called <var class="var">name</var>, using the
- given device parameters.
- If no name is specified it will receive a default name of the form "<var class="var">type</var>%d".
- </p>
- <p>The meaning of <var class="var">device</var> and the following arguments depends on the
- device type:
- </p><dl class="table">
- <dt><samp class="option">cuda</samp></dt>
- <dd><p><var class="var">device</var> is the number of the CUDA device.
- </p>
- <p>The following options are recognized:
- </p><dl class="table">
- <dt><samp class="option">primary_ctx</samp></dt>
- <dd><p>If set to 1, uses the primary device context instead of creating a new one.
- </p></dd>
- </dl>
- <p>Examples:
- </p><dl class="table">
- <dt><em class="emph">-init_hw_device cuda:1</em></dt>
- <dd><p>Choose the second device on the system.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device cuda:0,primary_ctx=1</em></dt>
- <dd><p>Choose the first device and use the primary device context.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dxva2</samp></dt>
- <dd><p><var class="var">device</var> is the number of the Direct3D 9 display adapter.
- </p>
- </dd>
- <dt><samp class="option">d3d11va</samp></dt>
- <dd><p><var class="var">device</var> is the number of the Direct3D 11 display adapter.
- If not specified, it will attempt to use the default Direct3D 11 display adapter
- or the first Direct3D 11 display adapter whose hardware VendorId is specified
- by ‘<samp class="samp">vendor_id</samp>’.
- </p>
- <p>Examples:
- </p><dl class="table">
- <dt><em class="emph">-init_hw_device d3d11va</em></dt>
- <dd><p>Create a d3d11va device on the default Direct3D 11 display adapter.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device d3d11va:1</em></dt>
- <dd><p>Create a d3d11va device on the Direct3D 11 display adapter specified by index 1.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device d3d11va:,vendor_id=0x8086</em></dt>
- <dd><p>Create a d3d11va device on the first Direct3D 11 display adapter whose hardware VendorId is 0x8086.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">vaapi</samp></dt>
- <dd><p><var class="var">device</var> is either an X11 display name, a DRM render node or a DirectX adapter index.
- If not specified, it will attempt to open the default X11 display (<em class="emph">$DISPLAY</em>)
- and then the first DRM render node (<em class="emph">/dev/dri/renderD128</em>), or the default
- DirectX adapter on Windows.
- </p>
- <p>The following options are recognized:
- </p><dl class="table">
- <dt><samp class="option">kernel_driver</samp></dt>
- <dd><p>When <var class="var">device</var> is not specified, use this option to specify the name of the kernel
- driver associated with the desired device. This option is available only when
- the hardware acceleration method <em class="emph">drm</em> and <em class="emph">vaapi</em> are enabled.
- </p></dd>
- <dt><samp class="option">vendor_id</samp></dt>
- <dd><p>When <var class="var">device</var> and <var class="var">kernel_driver</var> are not specified, use this option to specify
- the vendor id associated with the desired device. This option is available only when the
- hardware acceleration method <em class="emph">drm</em> and <em class="emph">vaapi</em> are enabled and <em class="emph">kernel_driver</em>
- is not specified.
- </p></dd>
- </dl>
- <p>Examples:
- </p><dl class="table">
- <dt><em class="emph">-init_hw_device vaapi</em></dt>
- <dd><p>Create a vaapi device on the default device.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vaapi:/dev/dri/renderD129</em></dt>
- <dd><p>Create a vaapi device on DRM render node <samp class="file">/dev/dri/renderD129</samp>.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vaapi:1</em></dt>
- <dd><p>Create a vaapi device on DirectX adapter 1.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vaapi:,kernel_driver=i915</em></dt>
- <dd><p>Create a vaapi device on a device associated with kernel driver ‘<samp class="samp">i915</samp>’.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vaapi:,vendor_id=0x8086</em></dt>
- <dd><p>Create a vaapi device on a device associated with vendor id ‘<samp class="samp">0x8086</samp>’.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">vdpau</samp></dt>
- <dd><p><var class="var">device</var> is an X11 display name.
- If not specified, it will attempt to open the default X11 display (<em class="emph">$DISPLAY</em>).
- </p>
- </dd>
- <dt><samp class="option">qsv</samp></dt>
- <dd><p><var class="var">device</var> selects a value in ‘<samp class="samp">MFX_IMPL_*</samp>’. Allowed values are:
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dt><samp class="option">sw</samp></dt>
- <dt><samp class="option">hw</samp></dt>
- <dt><samp class="option">auto_any</samp></dt>
- <dt><samp class="option">hw_any</samp></dt>
- <dt><samp class="option">hw2</samp></dt>
- <dt><samp class="option">hw3</samp></dt>
- <dt><samp class="option">hw4</samp></dt>
- </dl>
- <p>If not specified, ‘<samp class="samp">auto_any</samp>’ is used.
- (Note that it may be easier to achieve the desired result for QSV by creating the
- platform-appropriate subdevice (‘<samp class="samp">dxva2</samp>’ or ‘<samp class="samp">d3d11va</samp>’ or ‘<samp class="samp">vaapi</samp>’) and then deriving a
- QSV device from that.)
- </p>
- <p>The following options are recognized:
- </p><dl class="table">
- <dt><samp class="option">child_device</samp></dt>
- <dd><p>Specify a DRM render node on Linux or DirectX adapter on Windows.
- </p></dd>
- <dt><samp class="option">child_device_type</samp></dt>
- <dd><p>Choose platform-appropriate subdevice type. On Windows ‘<samp class="samp">d3d11va</samp>’ is used
- as default subdevice type when <code class="code">--enable-libvpl</code> is specified at configuration time,
- ‘<samp class="samp">dxva2</samp>’ is used as default subdevice type when <code class="code">--enable-libmfx</code> is specified at
- configuration time. On Linux user can use ‘<samp class="samp">vaapi</samp>’ only as subdevice type.
- </p></dd>
- </dl>
- <p>Examples:
- </p><dl class="table">
- <dt><em class="emph">-init_hw_device qsv:hw,child_device=/dev/dri/renderD129</em></dt>
- <dd><p>Create a QSV device with ‘<samp class="samp">MFX_IMPL_HARDWARE</samp>’ on DRM render node <samp class="file">/dev/dri/renderD129</samp>.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device qsv:hw,child_device=1</em></dt>
- <dd><p>Create a QSV device with ‘<samp class="samp">MFX_IMPL_HARDWARE</samp>’ on DirectX adapter 1.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device qsv:hw,child_device_type=d3d11va</em></dt>
- <dd><p>Choose the GPU subdevice with type ‘<samp class="samp">d3d11va</samp>’ and create QSV device with ‘<samp class="samp">MFX_IMPL_HARDWARE</samp>’.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device qsv:hw,child_device_type=dxva2</em></dt>
- <dd><p>Choose the GPU subdevice with type ‘<samp class="samp">dxva2</samp>’ and create QSV device with ‘<samp class="samp">MFX_IMPL_HARDWARE</samp>’.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va</em></dt>
- <dd><p>Create a QSV device with ‘<samp class="samp">MFX_IMPL_HARDWARE</samp>’ on DirectX adapter 1 with subdevice type ‘<samp class="samp">d3d11va</samp>’.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vaapi=va:/dev/dri/renderD129 -init_hw_device qsv=hw1@<var class="var">va</var></em></dt>
- <dd><p>Create a VAAPI device called ‘<samp class="samp">va</samp>’ on <samp class="file">/dev/dri/renderD129</samp>, then derive a QSV device called ‘<samp class="samp">hw1</samp>’
- from device ‘<samp class="samp">va</samp>’.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">opencl</samp></dt>
- <dd><p><var class="var">device</var> selects the platform and device as <em class="emph">platform_index.device_index</em>.
- </p>
- <p>The set of devices can also be filtered using the key-value pairs to find only
- devices matching particular platform or device strings.
- </p>
- <p>The strings usable as filters are:
- </p><dl class="table">
- <dt><samp class="option">platform_profile</samp></dt>
- <dt><samp class="option">platform_version</samp></dt>
- <dt><samp class="option">platform_name</samp></dt>
- <dt><samp class="option">platform_vendor</samp></dt>
- <dt><samp class="option">platform_extensions</samp></dt>
- <dt><samp class="option">device_name</samp></dt>
- <dt><samp class="option">device_vendor</samp></dt>
- <dt><samp class="option">driver_version</samp></dt>
- <dt><samp class="option">device_version</samp></dt>
- <dt><samp class="option">device_profile</samp></dt>
- <dt><samp class="option">device_extensions</samp></dt>
- <dt><samp class="option">device_type</samp></dt>
- </dl>
- <p>The indices and filters must together uniquely select a device.
- </p>
- <p>Examples:
- </p><dl class="table">
- <dt><em class="emph">-init_hw_device opencl:0.1</em></dt>
- <dd><p>Choose the second device on the first platform.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device opencl:,device_name=Foo9000</em></dt>
- <dd><p>Choose the device with a name containing the string <em class="emph">Foo9000</em>.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device opencl:1,device_type=gpu,device_extensions=cl_khr_fp16</em></dt>
- <dd><p>Choose the GPU device on the second platform supporting the <em class="emph">cl_khr_fp16</em>
- extension.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">vulkan</samp></dt>
- <dd><p>If <var class="var">device</var> is an integer, it selects the device by its index in a
- system-dependent list of devices. If <var class="var">device</var> is any other string, it
- selects the first device with a name containing that string as a substring.
- </p>
- <p>The following options are recognized:
- </p><dl class="table">
- <dt><samp class="option">debug</samp></dt>
- <dd><p>If set to 1, enables the validation layer, if installed.
- </p></dd>
- <dt><samp class="option">linear_images</samp></dt>
- <dd><p>If set to 1, images allocated by the hwcontext will be linear and locally mappable.
- </p></dd>
- <dt><samp class="option">instance_extensions</samp></dt>
- <dd><p>A plus separated list of additional instance extensions to enable.
- </p></dd>
- <dt><samp class="option">device_extensions</samp></dt>
- <dd><p>A plus separated list of additional device extensions to enable.
- </p></dd>
- </dl>
- <p>Examples:
- </p><dl class="table">
- <dt><em class="emph">-init_hw_device vulkan:1</em></dt>
- <dd><p>Choose the second device on the system.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vulkan:RADV</em></dt>
- <dd><p>Choose the first device with a name containing the string <em class="emph">RADV</em>.
- </p>
- </dd>
- <dt><em class="emph">-init_hw_device vulkan:0,instance_extensions=VK_KHR_wayland_surface+VK_KHR_xcb_surface</em></dt>
- <dd><p>Choose the first device and enable the Wayland and XCB instance extensions.
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">-init_hw_device <var class="var">type</var>[=<var class="var">name</var>]@<var class="var">source</var></samp></dt>
- <dd><p>Initialise a new hardware device of type <var class="var">type</var> called <var class="var">name</var>,
- deriving it from the existing device with the name <var class="var">source</var>.
- </p>
- </dd>
- <dt><samp class="option">-init_hw_device list</samp></dt>
- <dd><p>List all hardware device types supported in this build of ffmpeg.
- </p>
- </dd>
- <dt><samp class="option">-filter_hw_device <var class="var">name</var></samp></dt>
- <dd><p>Pass the hardware device called <var class="var">name</var> to all filters in any filter graph.
- This can be used to set the device to upload to with the <code class="code">hwupload</code> filter,
- or the device to map to with the <code class="code">hwmap</code> filter. Other filters may also
- make use of this parameter when they require a hardware device. Note that this
- is typically only required when the input is not already in hardware frames -
- when it is, filters will derive the device they require from the context of the
- frames they receive as input.
- </p>
- <p>This is a global setting, so all filters will receive the same device.
- </p>
- </dd>
- <dt><samp class="option">-hwaccel[:<var class="var">stream_specifier</var>] <var class="var">hwaccel</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Use hardware acceleration to decode the matching stream(s). The allowed values
- of <var class="var">hwaccel</var> are:
- </p><dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>Do not use any hardware acceleration (the default).
- </p>
- </dd>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Automatically select the hardware acceleration method.
- </p>
- </dd>
- <dt><samp class="option">vdpau</samp></dt>
- <dd><p>Use VDPAU (Video Decode and Presentation API for Unix) hardware acceleration.
- </p>
- </dd>
- <dt><samp class="option">dxva2</samp></dt>
- <dd><p>Use DXVA2 (DirectX Video Acceleration) hardware acceleration.
- </p>
- </dd>
- <dt><samp class="option">d3d11va</samp></dt>
- <dd><p>Use D3D11VA (DirectX Video Acceleration) hardware acceleration.
- </p>
- </dd>
- <dt><samp class="option">vaapi</samp></dt>
- <dd><p>Use VAAPI (Video Acceleration API) hardware acceleration.
- </p>
- </dd>
- <dt><samp class="option">qsv</samp></dt>
- <dd><p>Use the Intel QuickSync Video acceleration for video transcoding.
- </p>
- <p>Unlike most other values, this option does not enable accelerated decoding (that
- is used automatically whenever a qsv decoder is selected), but accelerated
- transcoding, without copying the frames into the system memory.
- </p>
- <p>For it to work, both the decoder and the encoder must support QSV acceleration
- and no filters must be used.
- </p>
- </dd>
- <dt><samp class="option">videotoolbox</samp></dt>
- <dd><p>Use Video Toolbox hardware acceleration.
- </p></dd>
- </dl>
- <p>This option has no effect if the selected hwaccel is not available or not
- supported by the chosen decoder.
- </p>
- <p>Note that most acceleration methods are intended for playback and will not be
- faster than software decoding on modern CPUs. Additionally, <code class="command">ffmpeg</code>
- will usually need to copy the decoded frames from the GPU memory into the system
- memory, resulting in further performance loss. This option is thus mainly
- useful for testing.
- </p>
- </dd>
- <dt><samp class="option">-hwaccel_device[:<var class="var">stream_specifier</var>] <var class="var">hwaccel_device</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>Select a device to use for hardware acceleration.
- </p>
- <p>This option only makes sense when the <samp class="option">-hwaccel</samp> option is also specified.
- It can either refer to an existing device created with <samp class="option">-init_hw_device</samp>
- by name, or it can create a new device as if
- ‘<samp class="samp">-init_hw_device</samp>’ <var class="var">type</var>:<var class="var">hwaccel_device</var>
- were called immediately before.
- </p>
- </dd>
- <dt><samp class="option">-hwaccels</samp></dt>
- <dd><p>List all hardware acceleration components enabled in this build of ffmpeg.
- Actual runtime availability depends on the hardware and its suitable driver
- being installed.
- </p>
- </dd>
- <dt><samp class="option">-fix_sub_duration_heartbeat[:<var class="var">stream_specifier</var>]</samp></dt>
- <dd><p>Set a specific output video stream as the heartbeat stream according to which
- to split and push through currently in-progress subtitle upon receipt of a
- random access packet.
- </p>
- <p>This lowers the latency of subtitles for which the end packet or the following
- subtitle has not yet been received. As a drawback, this will most likely lead
- to duplication of subtitle events in order to cover the full duration, so
- when dealing with use cases where latency of when the subtitle event is passed
- on to output is not relevant this option should not be utilized.
- </p>
- <p>Requires <samp class="option">-fix_sub_duration</samp> to be set for the relevant input subtitle
- stream for this to have any effect, as well as for the input subtitle stream
- having to be directly mapped to the same output in which the heartbeat stream
- resides.
- </p>
- </dd>
- </dl>
- <a name="Audio-Options"></a>
- <h3 class="section">5.7 Audio Options<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-aframes <var class="var">number</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the number of audio frames to output. This is an obsolete alias for
- <code class="code">-frames:a</code>, which you should use instead.
- </p></dd>
- <dt><samp class="option">-ar[:<var class="var">stream_specifier</var>] <var class="var">freq</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Set the audio sampling frequency. For output streams it is set by
- default to the frequency of the corresponding input stream. For input
- streams this option only makes sense for audio grabbing devices and raw
- demuxers and is mapped to the corresponding demuxer options.
- </p></dd>
- <dt><samp class="option">-aq <var class="var">q</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
- </p></dd>
- <dt><samp class="option">-ac[:<var class="var">stream_specifier</var>] <var class="var">channels</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Set the number of audio channels. For output streams it is set by
- default to the number of input audio channels. For input streams
- this option only makes sense for audio grabbing devices and raw demuxers
- and is mapped to the corresponding demuxer options.
- </p></dd>
- <dt><samp class="option">-an (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>As an input option, blocks all audio streams of a file from being filtered or
- being automatically selected or mapped for any output. See <code class="code">-discard</code>
- option to disable streams individually.
- </p>
- <p>As an output option, disables audio recording i.e. automatic selection or
- mapping of any audio stream. For full manual control see the <code class="code">-map</code>
- option.
- </p></dd>
- <dt><samp class="option">-acodec <var class="var">codec</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Set the audio codec. This is an alias for <code class="code">-codec:a</code>.
- </p></dd>
- <dt><samp class="option">-sample_fmt[:<var class="var">stream_specifier</var>] <var class="var">sample_fmt</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Set the audio sample format. Use <code class="code">-sample_fmts</code> to get a list
- of supported sample formats.
- </p>
- </dd>
- <dt><samp class="option">-af <var class="var">filtergraph</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Create the filtergraph specified by <var class="var">filtergraph</var> and use it to
- filter the stream.
- </p>
- <p>This is an alias for <code class="code">-filter:a</code>, see the <a class="ref" href="#filter_005foption">-filter option</a>.
- </p></dd>
- </dl>
- <a name="Advanced-Audio-options"></a>
- <h3 class="section">5.8 Advanced Audio options<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-Audio-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-Audio-options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-atag <var class="var">fourcc/tag</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Force audio tag/fourcc. This is an alias for <code class="code">-tag:a</code>.
- </p></dd>
- <dt><samp class="option">-ch_layout[:<var class="var">stream_specifier</var>] <var class="var">layout</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Alias for <code class="code">-channel_layout</code>.
- </p></dd>
- <dt><samp class="option">-channel_layout[:<var class="var">stream_specifier</var>] <var class="var">layout</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Set the audio channel layout. For output streams it is set by default to the
- input channel layout. For input streams it overrides the channel layout of the
- input. Not all decoders respect the overridden channel layout. This option
- also sets the channel layout for audio grabbing devices and raw demuxers
- and is mapped to the corresponding demuxer option.
- </p></dd>
- <dt><samp class="option">-guess_layout_max <var class="var">channels</var> (<em class="emph">input,per-stream</em>)</samp></dt>
- <dd><p>If some input channel layout is not known, try to guess only if it
- corresponds to at most the specified number of channels. For example, 2
- tells to <code class="command">ffmpeg</code> to recognize 1 channel as mono and 2 channels as
- stereo but not 6 channels as 5.1. The default is to always try to guess. Use
- 0 to disable all guessing. Using the <code class="code">-channel_layout</code> option to
- explicitly specify an input layout also disables guessing.
- </p></dd>
- </dl>
- <a name="Subtitle-options"></a>
- <h3 class="section">5.9 Subtitle options<span class="pull-right"><a class="anchor hidden-xs" href="#Subtitle-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Subtitle-options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-scodec <var class="var">codec</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Set the subtitle codec. This is an alias for <code class="code">-codec:s</code>.
- </p></dd>
- <dt><samp class="option">-sn (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>As an input option, blocks all subtitle streams of a file from being filtered or
- being automatically selected or mapped for any output. See <code class="code">-discard</code>
- option to disable streams individually.
- </p>
- <p>As an output option, disables subtitle recording i.e. automatic selection or
- mapping of any subtitle stream. For full manual control see the <code class="code">-map</code>
- option.
- </p></dd>
- </dl>
- <a name="Advanced-Subtitle-options"></a>
- <h3 class="section">5.10 Advanced Subtitle options<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-Subtitle-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-Subtitle-options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-fix_sub_duration</samp></dt>
- <dd><p>Fix subtitles durations. For each subtitle, wait for the next packet in the
- same stream and adjust the duration of the first to avoid overlap. This is
- necessary with some subtitles codecs, especially DVB subtitles, because the
- duration in the original packet is only a rough estimate and the end is
- actually marked by an empty subtitle frame. Failing to use this option when
- necessary can result in exaggerated durations or muxing failures due to
- non-monotonic timestamps.
- </p>
- <p>Note that this option will delay the output of all data until the next
- subtitle packet is decoded: it may increase memory consumption and latency a
- lot.
- </p>
- </dd>
- <dt><samp class="option">-canvas_size <var class="var">size</var></samp></dt>
- <dd><p>Set the size of the canvas used to render subtitles.
- </p>
- </dd>
- </dl>
- <a name="Advanced-options"></a>
- <h3 class="section">5.11 Advanced options<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-options" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-map [-]<var class="var">input_file_id</var>[:<var class="var">stream_specifier</var>][:<var class="var">view_specifier</var>][:?] | <var class="var">[linklabel]</var> (<em class="emph">output</em>)</samp></dt>
- <dd>
- <p>Create one or more streams in the output file. This option has two forms for
- specifying the data source(s): the first selects one or more streams from some
- input file (specified with <code class="code">-i</code>), the second takes an output from some
- complex filtergraph (specified with <code class="code">-filter_complex</code>).
- </p>
- <p>In the first form, an output stream is created for every stream from the input
- file with the index <var class="var">input_file_id</var>. If <var class="var">stream_specifier</var> is given,
- only those streams that match the specifier are used (see the
- <a class="ref" href="#Stream-specifiers">Stream specifiers</a> section for the <var class="var">stream_specifier</var> syntax).
- </p>
- <p>A <code class="code">-</code> character before the stream identifier creates a "negative" mapping.
- It disables matching streams from already created mappings.
- </p>
- <p>An optional <var class="var">view_specifier</var> may be given after the stream specifier, which
- for multiview video specifies the view to be used. The view specifier may have
- one of the following formats:
- </p><dl class="table">
- <dt><samp class="option">view:<var class="var">view_id</var></samp></dt>
- <dd><p>select a view by its ID; <var class="var">view_id</var> may be set to ’all’ to use all the views
- interleaved into one stream;
- </p>
- </dd>
- <dt><samp class="option">vidx:<var class="var">view_idx</var></samp></dt>
- <dd><p>select a view by its index; i.e. 0 is the base view, 1 is the first non-base
- view, etc.
- </p>
- </dd>
- <dt><samp class="option">vpos:<var class="var">position</var></samp></dt>
- <dd><p>select a view by its display position; <var class="var">position</var> may be <code class="code">left</code> or
- <code class="code">right</code>
- </p></dd>
- </dl>
- <p>The default for transcoding is to only use the base view, i.e. the equivalent of
- <code class="code">vidx:0</code>. For streamcopy, view specifiers are not supported and all views
- are always copied.
- </p>
- <p>A trailing <code class="code">?</code> after the stream index will allow the map to be
- optional: if the map matches no streams the map will be ignored instead
- of failing. Note the map will still fail if an invalid input file index
- is used; such as if the map refers to a non-existent input.
- </p>
- <p>An alternative <var class="var">[linklabel]</var> form will map outputs from complex filter
- graphs (see the <samp class="option">-filter_complex</samp> option) to the output file.
- <var class="var">linklabel</var> must correspond to a defined output link label in the graph.
- </p>
- <p>This option may be specified multiple times, each adding more streams to the
- output file. Any given input stream may also be mapped any number of times as a
- source for different output streams, e.g. in order to use different encoding
- options and/or filters. The streams are created in the output in the same order
- in which the <code class="code">-map</code> options are given on the commandline.
- </p>
- <p>Using this option disables the default mappings for this output file.
- </p>
- <p>Examples:
- </p>
- <dl class="table">
- <dt><em class="emph">map everything</em></dt>
- <dd><p>To map ALL streams from the first input file to output
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0 output
- </pre></div>
- </dd>
- <dt><em class="emph">select specific stream</em></dt>
- <dd><p>If you have two audio streams in the first input file, these streams are
- identified by <var class="var">0:0</var> and <var class="var">0:1</var>. You can use <code class="code">-map</code> to select which
- streams to place in an output file. For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0:1 out.wav
- </pre></div>
- <p>will map the second input stream in <samp class="file">INPUT</samp> to the (single) output stream
- in <samp class="file">out.wav</samp>.
- </p>
- </dd>
- <dt><em class="emph">create multiple streams</em></dt>
- <dd><p>To select the stream with index 2 from input file <samp class="file">a.mov</samp> (specified by the
- identifier <var class="var">0:2</var>), and stream with index 6 from input <samp class="file">b.mov</samp>
- (specified by the identifier <var class="var">1:6</var>), and copy them to the output file
- <samp class="file">out.mov</samp>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
- </pre></div>
- </dd>
- <dt><em class="emph">create multiple streams 2</em></dt>
- <dd><p>To select all video and the third audio stream from an input file:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
- </pre></div>
- </dd>
- <dt><em class="emph">negative map</em></dt>
- <dd><p>To map all the streams except the second audio, use negative mappings
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
- </pre></div>
- </dd>
- <dt><em class="emph">optional map</em></dt>
- <dd><p>To map the video and audio streams from the first input, and using the
- trailing <code class="code">?</code>, ignore the audio mapping if no audio streams exist in
- the first input:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0:v -map 0:a? OUTPUT
- </pre></div>
- </dd>
- <dt><em class="emph">map by language</em></dt>
- <dd><p>To pick the English audio stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0:m:language:eng OUTPUT
- </pre></div>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">-ignore_unknown</samp></dt>
- <dd><p>Ignore input streams with unknown type instead of failing if copying
- such streams is attempted.
- </p>
- </dd>
- <dt><samp class="option">-copy_unknown</samp></dt>
- <dd><p>Allow input streams with unknown type to be copied instead of failing if copying
- such streams is attempted.
- </p>
- </dd>
- <dt><samp class="option">-map_metadata[:<var class="var">metadata_spec_out</var>] <var class="var">infile</var>[:<var class="var">metadata_spec_in</var>] (<em class="emph">output,per-metadata</em>)</samp></dt>
- <dd><p>Set metadata information of the next output file from <var class="var">infile</var>. Note that
- those are file indices (zero-based), not filenames.
- Optional <var class="var">metadata_spec_in/out</var> parameters specify, which metadata to copy.
- A metadata specifier can have the following forms:
- </p><dl class="table">
- <dt><samp class="option"><var class="var">g</var></samp></dt>
- <dd><p>global metadata, i.e. metadata that applies to the whole file
- </p>
- </dd>
- <dt><samp class="option"><var class="var">s</var>[:<var class="var">stream_spec</var>]</samp></dt>
- <dd><p>per-stream metadata. <var class="var">stream_spec</var> is a stream specifier as described
- in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. In an input metadata specifier, the first
- matching stream is copied from. In an output metadata specifier, all matching
- streams are copied to.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">c</var>:<var class="var">chapter_index</var></samp></dt>
- <dd><p>per-chapter metadata. <var class="var">chapter_index</var> is the zero-based chapter index.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">p</var>:<var class="var">program_index</var></samp></dt>
- <dd><p>per-program metadata. <var class="var">program_index</var> is the zero-based program index.
- </p></dd>
- </dl>
- <p>If metadata specifier is omitted, it defaults to global.
- </p>
- <p>By default, global metadata is copied from the first input file,
- per-stream and per-chapter metadata is copied along with streams/chapters. These
- default mappings are disabled by creating any mapping of the relevant type. A negative
- file index can be used to create a dummy mapping that just disables automatic copying.
- </p>
- <p>For example to copy metadata from the first stream of the input file to global metadata
- of the output file:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3
- </pre></div>
- <p>To do the reverse, i.e. copy global metadata to all audio streams:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -map_metadata:s:a 0:g out.mkv
- </pre></div>
- <p>Note that simple <code class="code">0</code> would work as well in this example, since global
- metadata is assumed by default.
- </p>
- </dd>
- <dt><samp class="option">-map_chapters <var class="var">input_file_index</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Copy chapters from input file with index <var class="var">input_file_index</var> to the next
- output file. If no chapter mapping is specified, then chapters are copied from
- the first input file with at least one chapter. Use a negative file index to
- disable any chapter copying.
- </p>
- </dd>
- <dt><samp class="option">-benchmark (<em class="emph">global</em>)</samp></dt>
- <dd><p>Show benchmarking information at the end of an encode.
- Shows real, system and user time used and maximum memory consumption.
- Maximum memory consumption is not supported on all systems,
- it will usually display as 0 if not supported.
- </p></dd>
- <dt><samp class="option">-benchmark_all (<em class="emph">global</em>)</samp></dt>
- <dd><p>Show benchmarking information during the encode.
- Shows real, system and user time used in various steps (audio/video encode/decode).
- </p></dd>
- <dt><samp class="option">-timelimit <var class="var">duration</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Exit after ffmpeg has been running for <var class="var">duration</var> seconds in CPU user time.
- </p></dd>
- <dt><samp class="option">-dump (<em class="emph">global</em>)</samp></dt>
- <dd><p>Dump each input packet to stderr.
- </p></dd>
- <dt><samp class="option">-hex (<em class="emph">global</em>)</samp></dt>
- <dd><p>When dumping packets, also dump the payload.
- </p></dd>
- <dt><samp class="option">-readrate <var class="var">speed</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Limit input read speed.
- </p>
- <p>Its value is a floating-point positive number which represents the maximum duration of
- media, in seconds, that should be ingested in one second of wallclock time.
- Default value is zero and represents no imposed limitation on speed of ingestion.
- Value <code class="code">1</code> represents real-time speed and is equivalent to <code class="code">-re</code>.
- </p>
- <p>Mainly used to simulate a capture device or live input stream (e.g. when reading from a file).
- Should not be used with a low value when input is an actual capture device or live stream as
- it may cause packet loss.
- </p>
- <p>It is useful for when flow speed of output packets is important, such as live streaming.
- </p></dd>
- <dt><samp class="option">-re (<em class="emph">input</em>)</samp></dt>
- <dd><p>Read input at native frame rate. This is equivalent to setting <code class="code">-readrate 1</code>.
- </p></dd>
- <dt><samp class="option">-readrate_initial_burst <var class="var">seconds</var></samp></dt>
- <dd><p>Set an initial read burst time, in seconds, after which <samp class="option">-re/-readrate</samp>
- will be enforced.
- </p></dd>
- <dt><samp class="option">-readrate_catchup <var class="var">speed</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>If either the input or output is blocked leading to actual read speed falling behind the
- specified readrate, then this rate takes effect till the input catches up with the
- specified readrate. Must not be lower than the primary readrate.
- </p>
- </dd>
- <dt><samp class="option">-vsync <var class="var">parameter</var> (<em class="emph">global</em>)</samp></dt>
- <dt><samp class="option">-fps_mode[:<var class="var">stream_specifier</var>] <var class="var">parameter</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Set video sync method / framerate mode. vsync is applied to all output video streams
- but can be overridden for a stream by setting fps_mode. vsync is deprecated and will be
- removed in the future.
- </p>
- <p>For compatibility reasons some of the values for vsync can be specified as numbers (shown
- in parentheses in the following table).
- </p>
- <dl class="table">
- <dt><samp class="option">passthrough (0)</samp></dt>
- <dd><p>Each frame is passed with its timestamp from the demuxer to the muxer.
- </p></dd>
- <dt><samp class="option">cfr (1)</samp></dt>
- <dd><p>Frames will be duplicated and dropped to achieve exactly the requested
- constant frame rate.
- </p></dd>
- <dt><samp class="option">vfr (2)</samp></dt>
- <dd><p>Frames are passed through with their timestamp or dropped so as to
- prevent 2 frames from having the same timestamp.
- </p></dd>
- <dt><samp class="option">auto (-1)</samp></dt>
- <dd><p>Chooses between cfr and vfr depending on muxer capabilities. This is the
- default method.
- </p></dd>
- </dl>
- <p>Note that the timestamps may be further modified by the muxer, after this.
- For example, in the case that the format option <samp class="option">avoid_negative_ts</samp>
- is enabled.
- </p>
- <p>With -map you can select from which stream the timestamps should be
- taken. You can leave either video or audio unchanged and sync the
- remaining stream(s) to the unchanged one.
- </p>
- </dd>
- <dt><samp class="option">-frame_drop_threshold <var class="var">parameter</var></samp></dt>
- <dd><p>Frame drop threshold, which specifies how much behind video frames can
- be before they are dropped. In frame rate units, so 1.0 is one frame.
- The default is -1.1. One possible usecase is to avoid framedrops in case
- of noisy timestamps or to increase frame drop precision in case of exact
- timestamps.
- </p>
- </dd>
- <dt><samp class="option">-apad <var class="var">parameters</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Pad the output audio stream(s). This is the same as applying <code class="code">-af apad</code>.
- Argument is a string of filter parameters composed the same as with the <code class="code">apad</code> filter.
- <code class="code">-shortest</code> must be set for this output for the option to take effect.
- </p>
- </dd>
- <dt><samp class="option">-copyts</samp></dt>
- <dd><p>Do not process input timestamps, but keep their values without trying
- to sanitize them. In particular, do not remove the initial start time
- offset value.
- </p>
- <p>Note that, depending on the <samp class="option">vsync</samp> option or on specific muxer
- processing (e.g. in case the format option <samp class="option">avoid_negative_ts</samp>
- is enabled) the output timestamps may mismatch with the input
- timestamps even when this option is selected.
- </p>
- </dd>
- <dt><samp class="option">-start_at_zero</samp></dt>
- <dd><p>When used with <samp class="option">copyts</samp>, shift input timestamps so they start at zero.
- </p>
- <p>This means that using e.g. <code class="code">-ss 50</code> will make output timestamps start at
- 50 seconds, regardless of what timestamp the input file started at.
- </p>
- </dd>
- <dt><samp class="option">-copytb <var class="var">mode</var></samp></dt>
- <dd><p>Specify how to set the encoder timebase when stream copying. <var class="var">mode</var> is an
- integer numeric value, and can assume one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">1</samp></dt>
- <dd><p>Use the demuxer timebase.
- </p>
- <p>The time base is copied to the output encoder from the corresponding input
- demuxer. This is sometimes required to avoid non monotonically increasing
- timestamps when copying video streams with variable frame rate.
- </p>
- </dd>
- <dt><samp class="option">0</samp></dt>
- <dd><p>Use the decoder timebase.
- </p>
- <p>The time base is copied to the output encoder from the corresponding input
- decoder.
- </p>
- </dd>
- <dt><samp class="option">-1</samp></dt>
- <dd><p>Try to make the choice automatically, in order to generate a sane output.
- </p></dd>
- </dl>
- <p>Default value is -1.
- </p>
- </dd>
- <dt><samp class="option">-enc_time_base[:<var class="var">stream_specifier</var>] <var class="var">timebase</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Set the encoder timebase. <var class="var">timebase</var> can assume one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dd><p>Assign a default value according to the media type.
- </p>
- <p>For video - use 1/framerate, for audio - use 1/samplerate.
- </p>
- </dd>
- <dt><samp class="option">demux</samp></dt>
- <dd><p>Use the timebase from the demuxer.
- </p>
- </dd>
- <dt><samp class="option">filter</samp></dt>
- <dd><p>Use the timebase from the filtergraph.
- </p>
- </dd>
- <dt><samp class="option">a positive number</samp></dt>
- <dd><p>Use the provided number as the timebase.
- </p>
- <p>This field can be provided as a ratio of two integers (e.g. 1:24, 1:48000)
- or as a decimal number (e.g. 0.04166, 2.0833e-5)
- </p></dd>
- </dl>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">-bitexact (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Enable bitexact mode for (de)muxer and (de/en)coder
- </p></dd>
- <dt><samp class="option">-shortest (<em class="emph">output</em>)</samp></dt>
- <dd><p>Finish encoding when the shortest output stream ends.
- </p>
- <p>Note that this option may require buffering frames, which introduces extra
- latency. The maximum amount of this latency may be controlled with the
- <code class="code">-shortest_buf_duration</code> option.
- </p>
- </dd>
- <dt><samp class="option">-shortest_buf_duration <var class="var">duration</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>The <code class="code">-shortest</code> option may require buffering potentially large amounts
- of data when at least one of the streams is "sparse" (i.e. has large gaps
- between frames – this is typically the case for subtitles).
- </p>
- <p>This option controls the maximum duration of buffered frames in seconds.
- Larger values may allow the <code class="code">-shortest</code> option to produce more accurate
- results, but increase memory use and latency.
- </p>
- <p>The default value is 10 seconds.
- </p>
- </dd>
- <dt><samp class="option">-dts_delta_threshold <var class="var">threshold</var></samp></dt>
- <dd><p>Timestamp discontinuity delta threshold, expressed as a decimal number
- of seconds.
- </p>
- <p>The timestamp discontinuity correction enabled by this option is only
- applied to input formats accepting timestamp discontinuity (for which
- the <code class="code">AVFMT_TS_DISCONT</code> flag is enabled), e.g. MPEG-TS and HLS, and
- is automatically disabled when employing the <code class="code">-copyts</code> option
- (unless wrapping is detected).
- </p>
- <p>If a timestamp discontinuity is detected whose absolute value is
- greater than <var class="var">threshold</var>, ffmpeg will remove the discontinuity by
- decreasing/increasing the current DTS and PTS by the corresponding
- delta value.
- </p>
- <p>The default value is 10.
- </p>
- </dd>
- <dt><samp class="option">-dts_error_threshold <var class="var">threshold</var></samp></dt>
- <dd><p>Timestamp error delta threshold, expressed as a decimal number of
- seconds.
- </p>
- <p>The timestamp correction enabled by this option is only applied to
- input formats not accepting timestamp discontinuity (for which the
- <code class="code">AVFMT_TS_DISCONT</code> flag is not enabled).
- </p>
- <p>If a timestamp discontinuity is detected whose absolute value is
- greater than <var class="var">threshold</var>, ffmpeg will drop the PTS/DTS timestamp
- value.
- </p>
- <p>The default value is <code class="code">3600*30</code> (30 hours), which is arbitrarily
- picked and quite conservative.
- </p>
- </dd>
- <dt><samp class="option">-muxdelay <var class="var">seconds</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the maximum demux-decode delay.
- </p></dd>
- <dt><samp class="option">-muxpreload <var class="var">seconds</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the initial demux-decode delay.
- </p></dd>
- <dt><samp class="option">-streamid <var class="var">output-stream-index</var>:<var class="var">new-value</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Assign a new stream-id value to an output stream. This option should be
- specified prior to the output filename to which it applies.
- For the situation where multiple output files exist, a streamid
- may be reassigned to a different value.
- </p>
- <p>For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
- an output mpegts file:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts
- </pre></div>
- </dd>
- <dt><samp class="option">-bsf[:<var class="var">stream_specifier</var>] <var class="var">bitstream_filters</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Apply bitstream filters to matching streams. The filters are applied to each
- packet as it is received from the demuxer (when used as an input option) or
- before it is sent to the muxer (when used as an output option).
- </p>
- <p><var class="var">bitstream_filters</var> is a comma-separated list of bitstream filter
- specifications, each of the form
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">filter</var>[=<var class="var">optname0</var>=<var class="var">optval0</var>:<var class="var">optname1</var>=<var class="var">optval1</var>:...]
- </pre></div>
- <p>Any of the ’,=:’ characters that are to be a part of an option value need to be
- escaped with a backslash.
- </p>
- <p>Use the <code class="code">-bsfs</code> option to get the list of bitstream filters.
- </p>
- <p>E.g.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -bsf:v h264_mp4toannexb -i h264.mp4 -c:v copy -an out.h264
- </pre></div>
- <p>applies the <code class="code">h264_mp4toannexb</code> bitstream filter (which converts
- MP4-encapsulated H.264 stream to Annex B) to the <em class="emph">input</em> video stream.
- </p>
- <p>On the other hand,
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt
- </pre></div>
- <p>applies the <code class="code">mov2textsub</code> bitstream filter (which extracts text from MOV
- subtitles) to the <em class="emph">output</em> subtitle stream. Note, however, that since both
- examples use <code class="code">-c copy</code>, it matters little whether the filters are applied
- on input or output - that would change if transcoding was happening.
- </p>
- </dd>
- <dt><samp class="option">-tag[:<var class="var">stream_specifier</var>] <var class="var">codec_tag</var> (<em class="emph">input/output,per-stream</em>)</samp></dt>
- <dd><p>Force a tag/fourcc for matching streams.
- </p>
- </dd>
- <dt><samp class="option">-timecode <var class="var">hh</var>:<var class="var">mm</var>:<var class="var">ss</var>SEP<var class="var">ff</var></samp></dt>
- <dd><p>Specify Timecode for writing. <var class="var">SEP</var> is ’:’ for non drop timecode and ’;’
- (or ’.’) for drop.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg
- </pre></div>
- <a class="anchor" id="filter_005fcomplex_005foption"></a></dd>
- <dt><samp class="option">-filter_complex <var class="var">filtergraph</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or
- outputs. For simple graphs – those with one input and one output of the same
- type – see the <samp class="option">-filter</samp> options. <var class="var">filtergraph</var> is a description of
- the filtergraph, as described in the “Filtergraph syntax” section of the
- ffmpeg-filters manual. This option may be specified multiple times - each use
- creates a new complex filtergraph.
- </p>
- <p>Inputs to a complex filtergraph may come from different source types,
- distinguished by the format of the corresponding link label:
- </p><ul class="itemize mark-bullet">
- <li>To connect an input stream, use <code class="code">[file_index:stream_specifier]</code> (i.e. the
- same syntax as <samp class="option">-map</samp>). If <var class="var">stream_specifier</var> matches multiple
- streams, the first one will be used. For multiview video, the stream specifier
- may be followed by the view specifier, see documentation for the <samp class="option">-map</samp>
- option for its syntax.
- </li><li>To connect a loopback decoder use [dec:<var class="var">dec_idx</var>], where <var class="var">dec_idx</var> is
- the index of the loopback decoder to be connected to given input. For multiview
- video, the decoder index may be followed by the view specifier, see
- documentation for the <samp class="option">-map</samp> option for its syntax.
- </li><li>To connect an output from another complex filtergraph, use its link label. E.g
- the following example:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv \
- -filter_complex '[0:v]scale=size=hd1080,split=outputs=2[for_enc][orig_scaled]' \
- -c:v libx264 -map '[for_enc]' output.mkv \
- -dec 0:0 \
- -filter_complex '[dec:0][orig_scaled]hstack[stacked]' \
- -map '[stacked]' -c:v ffv1 comparison.mkv
- </pre></div>
- <p>reads an input video and
- </p><ul class="itemize mark-bullet">
- <li>(line 2) uses a complex filtergraph with one input and two outputs
- to scale the video to 1920x1080 and duplicate the result to both
- outputs;
- </li><li>(line 3) encodes one scaled output with <code class="code">libx264</code> and writes the result to
- <samp class="file">output.mkv</samp>;
- </li><li>(line 4) decodes this encoded stream with a loopback decoder;
- </li><li>(line 5) places the output of the loopback decoder (i.e. the
- <code class="code">libx264</code>-encoded video) side by side with the scaled original input;
- </li><li>(line 6) combined video is then losslessly encoded and written into
- <samp class="file">comparison.mkv</samp>.
- </li></ul>
- <p>Note that the two filtergraphs cannot be combined into one, because then there
- would be a cycle in the transcoding pipeline (filtergraph output goes to
- encoding, from there to decoding, then back to the same graph), and such cycles
- are not allowed.
- </p>
- </li></ul>
- <p>An unlabeled input will be connected to the first unused input stream of the
- matching type.
- </p>
- <p>Output link labels are referred to with <samp class="option">-map</samp>. Unlabeled outputs are
- added to the first output file.
- </p>
- <p>Note that with this option it is possible to use only lavfi sources without
- normal input files.
- </p>
- <p>For example, to overlay an image over video
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map
- '[out]' out.mkv
- </pre></div>
- <p>Here <code class="code">[0:v]</code> refers to the first video stream in the first input file,
- which is linked to the first (main) input of the overlay filter. Similarly the
- first video stream in the second input is linked to the second (overlay) input
- of overlay.
- </p>
- <p>Assuming there is only one video stream in each input file, we can omit input
- labels, so the above is equivalent to
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i video.mkv -i image.png -filter_complex 'overlay[out]' -map
- '[out]' out.mkv
- </pre></div>
- <p>Furthermore we can omit the output label and the single output from the filter
- graph will be added to the output file automatically, so we can simply write
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkv
- </pre></div>
- <p>As a special exception, you can use a bitmap subtitle stream as input: it
- will be converted into a video with the same size as the largest video in
- the file, or 720x576 if no video is present. Note that this is an
- experimental and temporary solution. It will be removed once libavfilter has
- proper support for subtitles.
- </p>
- <p>For example, to hardcode subtitles on top of a DVB-T recording stored in
- MPEG-TS format, delaying the subtitles by 1 second:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.ts -filter_complex \
- '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \
- -sn -map '#0x2dc' output.mkv
- </pre></div>
- <p>(0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video,
- audio and subtitles streams; 0:0, 0:3 and 0:7 would have worked too)
- </p>
- <p>To generate 5 seconds of pure red video using lavfi <code class="code">color</code> source:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv
- </pre></div>
- </dd>
- <dt><samp class="option">-filter_complex_threads <var class="var">nb_threads</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Defines how many threads are used to process a filter_complex graph.
- Similar to filter_threads but used for <code class="code">-filter_complex</code> graphs only.
- The default is the number of available CPUs.
- </p>
- </dd>
- <dt><samp class="option">-lavfi <var class="var">filtergraph</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or
- outputs. Equivalent to <samp class="option">-filter_complex</samp>.
- </p>
- </dd>
- <dt><samp class="option">-accurate_seek (<em class="emph">input</em>)</samp></dt>
- <dd><p>This option enables or disables accurate seeking in input files with the
- <samp class="option">-ss</samp> option. It is enabled by default, so seeking is accurate when
- transcoding. Use <samp class="option">-noaccurate_seek</samp> to disable it, which may be useful
- e.g. when copying some streams and transcoding the others.
- </p>
- </dd>
- <dt><samp class="option">-seek_timestamp (<em class="emph">input</em>)</samp></dt>
- <dd><p>This option enables or disables seeking by timestamp in input files with the
- <samp class="option">-ss</samp> option. It is disabled by default. If enabled, the argument
- to the <samp class="option">-ss</samp> option is considered an actual timestamp, and is not
- offset by the start time of the file. This matters only for files which do
- not start from timestamp 0, such as transport streams.
- </p>
- </dd>
- <dt><samp class="option">-thread_queue_size <var class="var">size</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>For input, this option sets the maximum number of queued packets when reading
- from the file or device. With low latency / high rate live streams, packets may
- be discarded if they are not read in a timely manner; setting this value can
- force ffmpeg to use a separate input thread and read packets as soon as they
- arrive. By default ffmpeg only does this if multiple inputs are specified.
- </p>
- <p>For output, this option specified the maximum number of packets that may be
- queued to each muxing thread.
- </p>
- </dd>
- <dt><samp class="option">-sdp_file <var class="var">file</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Print sdp information for an output stream to <var class="var">file</var>.
- This allows dumping sdp information when at least one output isn’t an
- rtp stream. (Requires at least one of the output formats to be rtp).
- </p>
- </dd>
- <dt><samp class="option">-discard (<em class="emph">input</em>)</samp></dt>
- <dd><p>Allows discarding specific streams or frames from streams.
- Any input stream can be fully discarded, using value <code class="code">all</code> whereas
- selective discarding of frames from a stream occurs at the demuxer
- and is not supported by all demuxers.
- </p>
- <dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>Discard no frame.
- </p>
- </dd>
- <dt><samp class="option">default</samp></dt>
- <dd><p>Default, which discards no frames.
- </p>
- </dd>
- <dt><samp class="option">noref</samp></dt>
- <dd><p>Discard all non-reference frames.
- </p>
- </dd>
- <dt><samp class="option">bidir</samp></dt>
- <dd><p>Discard all bidirectional frames.
- </p>
- </dd>
- <dt><samp class="option">nokey</samp></dt>
- <dd><p>Discard all frames excepts keyframes.
- </p>
- </dd>
- <dt><samp class="option">all</samp></dt>
- <dd><p>Discard all frames.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-abort_on <var class="var">flags</var> (<em class="emph">global</em>)</samp></dt>
- <dd><p>Stop and abort on various conditions. The following flags are available:
- </p>
- <dl class="table">
- <dt><samp class="option">empty_output</samp></dt>
- <dd><p>No packets were passed to the muxer, the output is empty.
- </p></dd>
- <dt><samp class="option">empty_output_stream</samp></dt>
- <dd><p>No packets were passed to the muxer in some of the output streams.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-max_error_rate (<em class="emph">global</em>)</samp></dt>
- <dd><p>Set fraction of decoding frame failures across all inputs which when crossed
- ffmpeg will return exit code 69. Crossing this threshold does not terminate
- processing. Range is a floating-point number between 0 to 1. Default is 2/3.
- </p>
- </dd>
- <dt><samp class="option">-xerror (<em class="emph">global</em>)</samp></dt>
- <dd><p>Stop and exit on error
- </p>
- </dd>
- <dt><samp class="option">-max_muxing_queue_size <var class="var">packets</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>When transcoding audio and/or video streams, ffmpeg will not begin writing into
- the output until it has one packet for each such stream. While waiting for that
- to happen, packets for other streams are buffered. This option sets the size of
- this buffer, in packets, for the matching output stream.
- </p>
- <p>The default value of this option should be high enough for most uses, so only
- touch this option if you are sure that you need it.
- </p>
- </dd>
- <dt><samp class="option">-muxing_queue_data_threshold <var class="var">bytes</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>This is a minimum threshold until which the muxing queue size is not taken into
- account. Defaults to 50 megabytes per stream, and is based on the overall size
- of packets passed to the muxer.
- </p>
- </dd>
- <dt><samp class="option">-auto_conversion_filters (<em class="emph">global</em>)</samp></dt>
- <dd><p>Enable automatically inserting format conversion filters in all filter
- graphs, including those defined by <samp class="option">-vf</samp>, <samp class="option">-af</samp>,
- <samp class="option">-filter_complex</samp> and <samp class="option">-lavfi</samp>. If filter format negotiation
- requires a conversion, the initialization of the filters will fail.
- Conversions can still be performed by inserting the relevant conversion
- filter (scale, aresample) in the graph.
- On by default, to explicitly disable it you need to specify
- <code class="code">-noauto_conversion_filters</code>.
- </p>
- </dd>
- <dt><samp class="option">-bits_per_raw_sample[:<var class="var">stream_specifier</var>] <var class="var">value</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Declare the number of bits per raw sample in the given output stream to be
- <var class="var">value</var>. Note that this option sets the information provided to the
- encoder/muxer, it does not change the stream to conform to this value. Setting
- values that do not match the stream properties may result in encoding failures
- or invalid output files.
- </p>
- <a class="anchor" id="stats_005fenc_005foptions"></a></dd>
- <dt><samp class="option">-stats_enc_pre[:<var class="var">stream_specifier</var>] <var class="var">path</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-stats_enc_post[:<var class="var">stream_specifier</var>] <var class="var">path</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-stats_mux_pre[:<var class="var">stream_specifier</var>] <var class="var">path</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Write per-frame encoding information about the matching streams into the file
- given by <var class="var">path</var>.
- </p>
- <p><samp class="option">-stats_enc_pre</samp> writes information about raw video or audio frames right
- before they are sent for encoding, while <samp class="option">-stats_enc_post</samp> writes
- information about encoded packets as they are received from the encoder.
- <samp class="option">-stats_mux_pre</samp> writes information about packets just as they are about to
- be sent to the muxer. Every frame or packet produces one line in the specified
- file. The format of this line is controlled by <samp class="option">-stats_enc_pre_fmt</samp> /
- <samp class="option">-stats_enc_post_fmt</samp> / <samp class="option">-stats_mux_pre_fmt</samp>.
- </p>
- <p>When stats for multiple streams are written into a single file, the lines
- corresponding to different streams will be interleaved. The precise order of
- this interleaving is not specified and not guaranteed to remain stable between
- different invocations of the program, even with the same options.
- </p>
- </dd>
- <dt><samp class="option">-stats_enc_pre_fmt[:<var class="var">stream_specifier</var>] <var class="var">format_spec</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-stats_enc_post_fmt[:<var class="var">stream_specifier</var>] <var class="var">format_spec</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dt><samp class="option">-stats_mux_pre_fmt[:<var class="var">stream_specifier</var>] <var class="var">format_spec</var> (<em class="emph">output,per-stream</em>)</samp></dt>
- <dd><p>Specify the format for the lines written with <samp class="option">-stats_enc_pre</samp> /
- <samp class="option">-stats_enc_post</samp> / <samp class="option">-stats_mux_pre</samp>.
- </p>
- <p><var class="var">format_spec</var> is a string that may contain directives of the form
- <var class="var">{fmt}</var>. <var class="var">format_spec</var> is backslash-escaped — use \{, \}, and \\
- to write a literal {, }, or \, respectively, into the output.
- </p>
- <p>The directives given with <var class="var">fmt</var> may be one of the following:
- </p><dl class="table">
- <dt><samp class="option">fidx</samp></dt>
- <dd><p>Index of the output file.
- </p>
- </dd>
- <dt><samp class="option">sidx</samp></dt>
- <dd><p>Index of the output stream in the file.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Frame number. Pre-encoding: number of frames sent to the encoder so far.
- Post-encoding: number of packets received from the encoder so far.
- Muxing: number of packets submitted to the muxer for this stream so far.
- </p>
- </dd>
- <dt><samp class="option">ni</samp></dt>
- <dd><p>Input frame number. Index of the input frame (i.e. output by a decoder) that
- corresponds to this output frame or packet. -1 if unavailable.
- </p>
- </dd>
- <dt><samp class="option">tb</samp></dt>
- <dd><p>Timebase in which this frame/packet’s timestamps are expressed, as a rational
- number <var class="var">num/den</var>. Note that encoder and muxer may use different timebases.
- </p>
- </dd>
- <dt><samp class="option">tbi</samp></dt>
- <dd><p>Timebase for <var class="var">ptsi</var>, as a rational number <var class="var">num/den</var>. Available when
- <var class="var">ptsi</var> is available, <var class="var">0/1</var> otherwise.
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>Presentation timestamp of the frame or packet, as an integer. Should be
- multiplied by the timebase to compute presentation time.
- </p>
- </dd>
- <dt><samp class="option">ptsi</samp></dt>
- <dd><p>Presentation timestamp of the input frame (see <var class="var">ni</var>), as an integer. Should
- be multiplied by <var class="var">tbi</var> to compute presentation time. Printed as
- (2^63 - 1 = 9223372036854775807) when not available.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>Presentation time of the frame or packet, as a decimal number. Equal to
- <var class="var">pts</var> multiplied by <var class="var">tb</var>.
- </p>
- </dd>
- <dt><samp class="option">ti</samp></dt>
- <dd><p>Presentation time of the input frame (see <var class="var">ni</var>), as a decimal number. Equal
- to <var class="var">ptsi</var> multiplied by <var class="var">tbi</var>. Printed as inf when not available.
- </p>
- </dd>
- <dt><samp class="option">dts (<em class="emph">packet</em>)</samp></dt>
- <dd><p>Decoding timestamp of the packet, as an integer. Should be multiplied by the
- timebase to compute presentation time.
- </p>
- </dd>
- <dt><samp class="option">dt (<em class="emph">packet</em>)</samp></dt>
- <dd><p>Decoding time of the frame or packet, as a decimal number. Equal to
- <var class="var">dts</var> multiplied by <var class="var">tb</var>.
- </p>
- </dd>
- <dt><samp class="option">sn (<em class="emph">frame,audio</em>)</samp></dt>
- <dd><p>Number of audio samples sent to the encoder so far.
- </p>
- </dd>
- <dt><samp class="option">samp (<em class="emph">frame,audio</em>)</samp></dt>
- <dd><p>Number of audio samples in the frame.
- </p>
- </dd>
- <dt><samp class="option">size (<em class="emph">packet</em>)</samp></dt>
- <dd><p>Size of the encoded packet in bytes.
- </p>
- </dd>
- <dt><samp class="option">br (<em class="emph">packet</em>)</samp></dt>
- <dd><p>Current bitrate in bits per second.
- </p>
- </dd>
- <dt><samp class="option">abr (<em class="emph">packet</em>)</samp></dt>
- <dd><p>Average bitrate for the whole stream so far, in bits per second, -1 if it cannot
- be determined at this point.
- </p>
- </dd>
- <dt><samp class="option">key (<em class="emph">packet</em>)</samp></dt>
- <dd><p>Character ’K’ if the packet contains a keyframe, character ’N’ otherwise.
- </p></dd>
- </dl>
- <p>Directives tagged with <em class="emph">packet</em> may only be used with
- <samp class="option">-stats_enc_post_fmt</samp> and <samp class="option">-stats_mux_pre_fmt</samp>.
- </p>
- <p>Directives tagged with <em class="emph">frame</em> may only be used with
- <samp class="option">-stats_enc_pre_fmt</samp>.
- </p>
- <p>Directives tagged with <em class="emph">audio</em> may only be used with audio streams.
- </p>
- <p>The default format strings are:
- </p><dl class="table">
- <dt><samp class="option">pre-encoding</samp></dt>
- <dd><p>{fidx} {sidx} {n} {t}
- </p></dd>
- <dt><samp class="option">post-encoding</samp></dt>
- <dd><p>{fidx} {sidx} {n} {t}
- </p></dd>
- </dl>
- <p>In the future, new items may be added to the end of the default formatting
- strings. Users who depend on the format staying exactly the same, should
- prescribe it manually.
- </p>
- <p>Note that stats for different streams written into the same file may have
- different formats.
- </p>
- </dd>
- </dl>
- <a name="Preset-files"></a>
- <h3 class="section">5.12 Preset files<span class="pull-right"><a class="anchor hidden-xs" href="#Preset-files" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Preset-files" aria-hidden="true">TOC</a></span></h3>
- <p>A preset file contains a sequence of <var class="var">option</var>=<var class="var">value</var> pairs,
- one for each line, specifying a sequence of options which would be
- awkward to specify on the command line. Lines starting with the hash
- (’#’) character are ignored and are used to provide comments. Check
- the <samp class="file">presets</samp> directory in the FFmpeg source tree for examples.
- </p>
- <p>There are two types of preset files: ffpreset and avpreset files.
- </p>
- <a name="ffpreset-files"></a>
- <h4 class="subsection">5.12.1 ffpreset files<span class="pull-right"><a class="anchor hidden-xs" href="#ffpreset-files" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ffpreset-files" aria-hidden="true">TOC</a></span></h4>
- <p>ffpreset files are specified with the <code class="code">vpre</code>, <code class="code">apre</code>,
- <code class="code">spre</code>, and <code class="code">fpre</code> options. The <code class="code">fpre</code> option takes the
- filename of the preset instead of a preset name as input and can be
- used for any kind of codec. For the <code class="code">vpre</code>, <code class="code">apre</code>, and
- <code class="code">spre</code> options, the options specified in a preset file are
- applied to the currently selected codec of the same type as the preset
- option.
- </p>
- <p>The argument passed to the <code class="code">vpre</code>, <code class="code">apre</code>, and <code class="code">spre</code>
- preset options identifies the preset file to use according to the
- following rules:
- </p>
- <p>First ffmpeg searches for a file named <var class="var">arg</var>.ffpreset in the
- directories <samp class="file">$FFMPEG_DATADIR</samp> (if set), and <samp class="file">$HOME/.ffmpeg</samp>, and in
- the datadir defined at configuration time (usually <samp class="file">PREFIX/share/ffmpeg</samp>)
- or in a <samp class="file">ffpresets</samp> folder along the executable on win32,
- in that order. For example, if the argument is <code class="code">libvpx-1080p</code>, it will
- search for the file <samp class="file">libvpx-1080p.ffpreset</samp>.
- </p>
- <p>If no such file is found, then ffmpeg will search for a file named
- <var class="var">codec_name</var>-<var class="var">arg</var>.ffpreset in the above-mentioned
- directories, where <var class="var">codec_name</var> is the name of the codec to which
- the preset file options will be applied. For example, if you select
- the video codec with <code class="code">-vcodec libvpx</code> and use <code class="code">-vpre 1080p</code>,
- then it will search for the file <samp class="file">libvpx-1080p.ffpreset</samp>.
- </p>
- <a name="avpreset-files"></a>
- <h4 class="subsection">5.12.2 avpreset files<span class="pull-right"><a class="anchor hidden-xs" href="#avpreset-files" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avpreset-files" aria-hidden="true">TOC</a></span></h4>
- <p>avpreset files are specified with the <code class="code">pre</code> option. They work similar to
- ffpreset files, but they only allow encoder- specific options. Therefore, an
- <var class="var">option</var>=<var class="var">value</var> pair specifying an encoder cannot be used.
- </p>
- <p>When the <code class="code">pre</code> option is specified, ffmpeg will look for files with the
- suffix .avpreset in the directories <samp class="file">$AVCONV_DATADIR</samp> (if set), and
- <samp class="file">$HOME/.avconv</samp>, and in the datadir defined at configuration time (usually
- <samp class="file">PREFIX/share/ffmpeg</samp>), in that order.
- </p>
- <p>First ffmpeg searches for a file named <var class="var">codec_name</var>-<var class="var">arg</var>.avpreset in
- the above-mentioned directories, where <var class="var">codec_name</var> is the name of the codec
- to which the preset file options will be applied. For example, if you select the
- video codec with <code class="code">-vcodec libvpx</code> and use <code class="code">-pre 1080p</code>, then it will
- search for the file <samp class="file">libvpx-1080p.avpreset</samp>.
- </p>
- <p>If no such file is found, then ffmpeg will search for a file named
- <var class="var">arg</var>.avpreset in the same directories.
- </p>
- <a class="anchor" id="vstats_005ffile_005fformat"></a><a name="vstats-file-format"></a>
- <h3 class="section">5.13 vstats file format<span class="pull-right"><a class="anchor hidden-xs" href="#vstats-file-format" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vstats-file-format" aria-hidden="true">TOC</a></span></h3>
- <p>The <code class="code">-vstats</code> and <code class="code">-vstats_file</code> options enable generation of a file
- containing statistics about the generated video outputs.
- </p>
- <p>The <code class="code">-vstats_version</code> option controls the format version of the generated
- file.
- </p>
- <p>With version <code class="code">1</code> the format is:
- </p><div class="example">
- <pre class="example-preformatted">frame= <var class="var">FRAME</var> q= <var class="var">FRAME_QUALITY</var> PSNR= <var class="var">PSNR</var> f_size= <var class="var">FRAME_SIZE</var> s_size= <var class="var">STREAM_SIZE</var>kB time= <var class="var">TIMESTAMP</var> br= <var class="var">BITRATE</var>kbits/s avg_br= <var class="var">AVERAGE_BITRATE</var>kbits/s
- </pre></div>
- <p>With version <code class="code">2</code> the format is:
- </p><div class="example">
- <pre class="example-preformatted">out= <var class="var">OUT_FILE_INDEX</var> st= <var class="var">OUT_FILE_STREAM_INDEX</var> frame= <var class="var">FRAME_NUMBER</var> q= <var class="var">FRAME_QUALITY</var>f PSNR= <var class="var">PSNR</var> f_size= <var class="var">FRAME_SIZE</var> s_size= <var class="var">STREAM_SIZE</var>kB time= <var class="var">TIMESTAMP</var> br= <var class="var">BITRATE</var>kbits/s avg_br= <var class="var">AVERAGE_BITRATE</var>kbits/s
- </pre></div>
- <p>The value corresponding to each key is described below:
- </p><dl class="table">
- <dt><samp class="option">avg_br</samp></dt>
- <dd><p>average bitrate expressed in Kbits/s
- </p>
- </dd>
- <dt><samp class="option">br</samp></dt>
- <dd><p>bitrate expressed in Kbits/s
- </p>
- </dd>
- <dt><samp class="option">frame</samp></dt>
- <dd><p>number of encoded frame
- </p>
- </dd>
- <dt><samp class="option">out</samp></dt>
- <dd><p>out file index
- </p>
- </dd>
- <dt><samp class="option">PSNR</samp></dt>
- <dd><p>Peak Signal to Noise Ratio
- </p>
- </dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>quality of the frame
- </p>
- </dd>
- <dt><samp class="option">f_size</samp></dt>
- <dd><p>encoded packet size expressed as number of bytes
- </p>
- </dd>
- <dt><samp class="option">s_size</samp></dt>
- <dd><p>stream size expressed in KiB
- </p>
- </dd>
- <dt><samp class="option">st</samp></dt>
- <dd><p>out file stream index
- </p>
- </dd>
- <dt><samp class="option">time</samp></dt>
- <dd><p>time of the packet
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>picture type
- </p></dd>
- </dl>
- <p>See also the <a class="ref" href="#stats_005fenc_005foptions">-stats_enc options</a> for an alternative way
- to show encoding statistics.
- </p>
- <a name="Examples-1"></a>
- <h2 class="chapter">6 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-1" aria-hidden="true">TOC</a></span></h2>
- <a name="Video-and-Audio-grabbing"></a>
- <h3 class="section">6.1 Video and Audio grabbing<span class="pull-right"><a class="anchor hidden-xs" href="#Video-and-Audio-grabbing" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-and-Audio-grabbing" aria-hidden="true">TOC</a></span></h3>
- <p>If you specify the input format and device then ffmpeg can grab video
- and audio directly.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
- </pre></div>
- <p>Or with an ALSA audio source (mono input, card id 1) instead of OSS:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg
- </pre></div>
- <p>Note that you must activate the right video source and channel before
- launching ffmpeg with any TV viewer such as
- <a class="uref" href="http://linux.bytesex.org/xawtv/">xawtv</a> by Gerd Knorr. You also
- have to set the audio recording levels correctly with a
- standard mixer.
- </p>
- <a name="X11-grabbing"></a>
- <h3 class="section">6.2 X11 grabbing<span class="pull-right"><a class="anchor hidden-xs" href="#X11-grabbing" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-X11-grabbing" aria-hidden="true">TOC</a></span></h3>
- <p>Grab the X11 display with ffmpeg via
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg
- </pre></div>
- <p>0.0 is display.screen number of your X11 server, same as
- the DISPLAY environment variable.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg
- </pre></div>
- <p>0.0 is display.screen number of your X11 server, same as the DISPLAY environment
- variable. 10 is the x-offset and 20 the y-offset for the grabbing.
- </p>
- <a name="Video-and-Audio-file-format-conversion"></a>
- <h3 class="section">6.3 Video and Audio file format conversion<span class="pull-right"><a class="anchor hidden-xs" href="#Video-and-Audio-file-format-conversion" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-and-Audio-file-format-conversion" aria-hidden="true">TOC</a></span></h3>
- <p>Any supported file format and protocol can serve as input to ffmpeg:
- </p>
- <p>Examples:
- </p><ul class="itemize mark-bullet">
- <li>You can use YUV files as input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
- </pre></div>
- <p>It will use the files:
- </p><div class="example">
- <pre class="example-preformatted">/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
- /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
- </pre></div>
- <p>The Y files use twice the resolution of the U and V files. They are
- raw files, without header. They can be generated by all decent video
- decoders. You must specify the size of the image with the <samp class="option">-s</samp> option
- if ffmpeg cannot guess it.
- </p>
- </li><li>You can input from a raw YUV420P file:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i /tmp/test.yuv /tmp/out.avi
- </pre></div>
- <p>test.yuv is a file containing raw YUV planar data. Each frame is composed
- of the Y plane followed by the U and V planes at half vertical and
- horizontal resolution.
- </p>
- </li><li>You can output to a raw YUV420P file:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i mydivx.avi hugefile.yuv
- </pre></div>
- </li><li>You can set several input files and output files:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
- </pre></div>
- <p>Converts the audio file a.wav and the raw YUV video file a.yuv
- to MPEG file a.mpg.
- </p>
- </li><li>You can also do audio and video conversions at the same time:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
- </pre></div>
- <p>Converts a.wav to MPEG audio at 22050 Hz sample rate.
- </p>
- </li><li>You can encode to several formats at the same time and define a
- mapping from input stream to output streams:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2
- </pre></div>
- <p>Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. ’-map
- file:index’ specifies which input stream is used for each output
- stream, in the order of the definition of output streams.
- </p>
- </li><li>You can transcode decrypted VOBs:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
- </pre></div>
- <p>This is a typical DVD ripping example; the input is a VOB file, the
- output an AVI file with MPEG-4 video and MP3 audio. Note that in this
- command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
- GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
- input video. Furthermore, the audio stream is MP3-encoded so you need
- to enable LAME support by passing <code class="code">--enable-libmp3lame</code> to configure.
- The mapping is particularly useful for DVD transcoding
- to get the desired audio language.
- </p>
- <p>NOTE: To see the supported input formats, use <code class="code">ffmpeg -demuxers</code>.
- </p>
- </li><li>You can extract images from a video, or create a video from many images:
- <p>For extracting images from a video:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
- </pre></div>
- <p>This will extract one video frame per second from the video and will
- output them in files named <samp class="file">foo-001.jpeg</samp>, <samp class="file">foo-002.jpeg</samp>,
- etc. Images will be rescaled to fit the new WxH values.
- </p>
- <p>If you want to extract just a limited number of frames, you can use the
- above command in combination with the <code class="code">-frames:v</code> or <code class="code">-t</code> option,
- or in combination with -ss to start extracting from a certain point in time.
- </p>
- <p>For creating a video from many images:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f image2 -framerate 12 -i foo-%03d.jpeg -s WxH foo.avi
- </pre></div>
- <p>The syntax <code class="code">foo-%03d.jpeg</code> specifies to use a decimal number
- composed of three digits padded with zeroes to express the sequence
- number. It is the same syntax supported by the C printf function, but
- only formats accepting a normal integer are suitable.
- </p>
- <p>When importing an image sequence, -i also supports expanding
- shell-like wildcard patterns (globbing) internally, by selecting the
- image2-specific <code class="code">-pattern_type glob</code> option.
- </p>
- <p>For example, for creating a video from filenames matching the glob pattern
- <code class="code">foo-*.jpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f image2 -pattern_type glob -framerate 12 -i 'foo-*.jpeg' -s WxH foo.avi
- </pre></div>
- </li><li>You can put many streams of the same type in the output:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i test1.avi -i test2.avi -map 1:1 -map 1:0 -map 0:1 -map 0:0 -c copy -y test12.nut
- </pre></div>
- <p>The resulting output file <samp class="file">test12.nut</samp> will contain the first four streams
- from the input files in reverse order.
- </p>
- </li><li>To force CBR video output:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
- </pre></div>
- </li><li>The four options lmin, lmax, mblmin and mblmax use ’lambda’ units,
- but you may use the QP2LAMBDA constant to easily convert from ’q’ units:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
- </pre></div>
- </li></ul>
- <a name="Syntax"></a>
- <h2 class="chapter">7 Syntax<span class="pull-right"><a class="anchor hidden-xs" href="#Syntax" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Syntax" aria-hidden="true">TOC</a></span></h2>
- <p>This section documents the syntax and formats employed by the FFmpeg
- libraries and tools.
- </p>
- <a class="anchor" id="quoting_005fand_005fescaping"></a><a name="Quoting-and-escaping"></a>
- <h3 class="section">7.1 Quoting and escaping<span class="pull-right"><a class="anchor hidden-xs" href="#Quoting-and-escaping" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Quoting-and-escaping" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg adopts the following quoting and escaping mechanism, unless
- explicitly specified. The following rules are applied:
- </p>
- <ul class="itemize mark-bullet">
- <li>‘<samp class="samp">'</samp>’ and ‘<samp class="samp">\</samp>’ are special characters (respectively used for
- quoting and escaping). In addition to them, there might be other
- special characters depending on the specific syntax where the escaping
- and quoting are employed.
- </li><li>A special character is escaped by prefixing it with a ‘<samp class="samp">\</samp>’.
- </li><li>All characters enclosed between ‘<samp class="samp">''</samp>’ are included literally in the
- parsed string. The quote character ‘<samp class="samp">'</samp>’ itself cannot be quoted,
- so you may need to close the quote and escape it.
- </li><li>Leading and trailing whitespaces, unless escaped or quoted, are
- removed from the parsed string.
- </li></ul>
- <p>Note that you may need to add a second level of escaping when using
- the command line or a script, which depends on the syntax of the
- adopted shell language.
- </p>
- <p>The function <code class="code">av_get_token</code> defined in
- <samp class="file">libavutil/avstring.h</samp> can be used to parse a token quoted or
- escaped according to the rules defined above.
- </p>
- <p>The tool <samp class="file">tools/ffescape</samp> in the FFmpeg source tree can be used
- to automatically quote or escape a string in a script.
- </p>
- <a name="Examples-2"></a>
- <h4 class="subsection">7.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-2" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Escape the string <code class="code">Crime d'Amour</code> containing the <code class="code">'</code> special
- character:
- <div class="example">
- <pre class="example-preformatted">Crime d\'Amour
- </pre></div>
- </li><li>The string above contains a quote, so the <code class="code">'</code> needs to be escaped
- when quoting it:
- <div class="example">
- <pre class="example-preformatted">'Crime d'\''Amour'
- </pre></div>
- </li><li>Include leading or trailing whitespaces using quoting:
- <div class="example">
- <pre class="example-preformatted">' this string starts and ends with whitespaces '
- </pre></div>
- </li><li>Escaping and quoting can be mixed together:
- <div class="example">
- <pre class="example-preformatted">' The string '\'string\'' is a string '
- </pre></div>
- </li><li>To include a literal ‘<samp class="samp">\</samp>’ you can use either escaping or quoting:
- <div class="example">
- <pre class="example-preformatted">'c:\foo' can be written as c:\\foo
- </pre></div>
- </li></ul>
- <a class="anchor" id="date-syntax"></a><a name="Date"></a>
- <h3 class="section">7.2 Date<span class="pull-right"><a class="anchor hidden-xs" href="#Date" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Date" aria-hidden="true">TOC</a></span></h3>
- <p>The accepted syntax is:
- </p><div class="example">
- <pre class="example-preformatted">[(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z]
- now
- </pre></div>
- <p>If the value is "now" it takes the current time.
- </p>
- <p>Time is local time unless Z is appended, in which case it is
- interpreted as UTC.
- If the year-month-day part is not specified it takes the current
- year-month-day.
- </p>
- <a class="anchor" id="time-duration-syntax"></a><a name="Time-duration"></a>
- <h3 class="section">7.3 Time duration<span class="pull-right"><a class="anchor hidden-xs" href="#Time-duration" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Time-duration" aria-hidden="true">TOC</a></span></h3>
- <p>There are two accepted syntaxes for expressing time duration.
- </p>
- <div class="example">
- <pre class="example-preformatted">[-][<var class="var">HH</var>:]<var class="var">MM</var>:<var class="var">SS</var>[.<var class="var">m</var>...]
- </pre></div>
- <p><var class="var">HH</var> expresses the number of hours, <var class="var">MM</var> the number of minutes
- for a maximum of 2 digits, and <var class="var">SS</var> the number of seconds for a
- maximum of 2 digits. The <var class="var">m</var> at the end expresses decimal value for
- <var class="var">SS</var>.
- </p>
- <p><em class="emph">or</em>
- </p>
- <div class="example">
- <pre class="example-preformatted">[-]<var class="var">S</var>+[.<var class="var">m</var>...][s|ms|us]
- </pre></div>
- <p><var class="var">S</var> expresses the number of seconds, with the optional decimal part
- <var class="var">m</var>. The optional literal suffixes ‘<samp class="samp">s</samp>’, ‘<samp class="samp">ms</samp>’ or ‘<samp class="samp">us</samp>’
- indicate to interpret the value as seconds, milliseconds or microseconds,
- respectively.
- </p>
- <p>In both expressions, the optional ‘<samp class="samp">-</samp>’ indicates negative duration.
- </p>
- <a name="Examples-3"></a>
- <h4 class="subsection">7.3.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-3" aria-hidden="true">TOC</a></span></h4>
- <p>The following examples are all valid time duration:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">55</samp>’</dt>
- <dd><p>55 seconds
- </p>
- </dd>
- <dt>‘<samp class="samp">0.2</samp>’</dt>
- <dd><p>0.2 seconds
- </p>
- </dd>
- <dt>‘<samp class="samp">200ms</samp>’</dt>
- <dd><p>200 milliseconds, that’s 0.2s
- </p>
- </dd>
- <dt>‘<samp class="samp">200000us</samp>’</dt>
- <dd><p>200000 microseconds, that’s 0.2s
- </p>
- </dd>
- <dt>‘<samp class="samp">12:03:45</samp>’</dt>
- <dd><p>12 hours, 03 minutes and 45 seconds
- </p>
- </dd>
- <dt>‘<samp class="samp">23.189</samp>’</dt>
- <dd><p>23.189 seconds
- </p></dd>
- </dl>
- <a class="anchor" id="video-size-syntax"></a><a name="Video-size"></a>
- <h3 class="section">7.4 Video size<span class="pull-right"><a class="anchor hidden-xs" href="#Video-size" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-size" aria-hidden="true">TOC</a></span></h3>
- <p>Specify the size of the sourced video, it may be a string of the form
- <var class="var">width</var>x<var class="var">height</var>, or the name of a size abbreviation.
- </p>
- <p>The following abbreviations are recognized:
- </p><dl class="table">
- <dt>‘<samp class="samp">ntsc</samp>’</dt>
- <dd><p>720x480
- </p></dd>
- <dt>‘<samp class="samp">pal</samp>’</dt>
- <dd><p>720x576
- </p></dd>
- <dt>‘<samp class="samp">qntsc</samp>’</dt>
- <dd><p>352x240
- </p></dd>
- <dt>‘<samp class="samp">qpal</samp>’</dt>
- <dd><p>352x288
- </p></dd>
- <dt>‘<samp class="samp">sntsc</samp>’</dt>
- <dd><p>640x480
- </p></dd>
- <dt>‘<samp class="samp">spal</samp>’</dt>
- <dd><p>768x576
- </p></dd>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dd><p>352x240
- </p></dd>
- <dt>‘<samp class="samp">ntsc-film</samp>’</dt>
- <dd><p>352x240
- </p></dd>
- <dt>‘<samp class="samp">sqcif</samp>’</dt>
- <dd><p>128x96
- </p></dd>
- <dt>‘<samp class="samp">qcif</samp>’</dt>
- <dd><p>176x144
- </p></dd>
- <dt>‘<samp class="samp">cif</samp>’</dt>
- <dd><p>352x288
- </p></dd>
- <dt>‘<samp class="samp">4cif</samp>’</dt>
- <dd><p>704x576
- </p></dd>
- <dt>‘<samp class="samp">16cif</samp>’</dt>
- <dd><p>1408x1152
- </p></dd>
- <dt>‘<samp class="samp">qqvga</samp>’</dt>
- <dd><p>160x120
- </p></dd>
- <dt>‘<samp class="samp">qvga</samp>’</dt>
- <dd><p>320x240
- </p></dd>
- <dt>‘<samp class="samp">vga</samp>’</dt>
- <dd><p>640x480
- </p></dd>
- <dt>‘<samp class="samp">svga</samp>’</dt>
- <dd><p>800x600
- </p></dd>
- <dt>‘<samp class="samp">xga</samp>’</dt>
- <dd><p>1024x768
- </p></dd>
- <dt>‘<samp class="samp">uxga</samp>’</dt>
- <dd><p>1600x1200
- </p></dd>
- <dt>‘<samp class="samp">qxga</samp>’</dt>
- <dd><p>2048x1536
- </p></dd>
- <dt>‘<samp class="samp">sxga</samp>’</dt>
- <dd><p>1280x1024
- </p></dd>
- <dt>‘<samp class="samp">qsxga</samp>’</dt>
- <dd><p>2560x2048
- </p></dd>
- <dt>‘<samp class="samp">hsxga</samp>’</dt>
- <dd><p>5120x4096
- </p></dd>
- <dt>‘<samp class="samp">wvga</samp>’</dt>
- <dd><p>852x480
- </p></dd>
- <dt>‘<samp class="samp">wxga</samp>’</dt>
- <dd><p>1366x768
- </p></dd>
- <dt>‘<samp class="samp">wsxga</samp>’</dt>
- <dd><p>1600x1024
- </p></dd>
- <dt>‘<samp class="samp">wuxga</samp>’</dt>
- <dd><p>1920x1200
- </p></dd>
- <dt>‘<samp class="samp">woxga</samp>’</dt>
- <dd><p>2560x1600
- </p></dd>
- <dt>‘<samp class="samp">wqsxga</samp>’</dt>
- <dd><p>3200x2048
- </p></dd>
- <dt>‘<samp class="samp">wquxga</samp>’</dt>
- <dd><p>3840x2400
- </p></dd>
- <dt>‘<samp class="samp">whsxga</samp>’</dt>
- <dd><p>6400x4096
- </p></dd>
- <dt>‘<samp class="samp">whuxga</samp>’</dt>
- <dd><p>7680x4800
- </p></dd>
- <dt>‘<samp class="samp">cga</samp>’</dt>
- <dd><p>320x200
- </p></dd>
- <dt>‘<samp class="samp">ega</samp>’</dt>
- <dd><p>640x350
- </p></dd>
- <dt>‘<samp class="samp">hd480</samp>’</dt>
- <dd><p>852x480
- </p></dd>
- <dt>‘<samp class="samp">hd720</samp>’</dt>
- <dd><p>1280x720
- </p></dd>
- <dt>‘<samp class="samp">hd1080</samp>’</dt>
- <dd><p>1920x1080
- </p></dd>
- <dt>‘<samp class="samp">2k</samp>’</dt>
- <dd><p>2048x1080
- </p></dd>
- <dt>‘<samp class="samp">2kflat</samp>’</dt>
- <dd><p>1998x1080
- </p></dd>
- <dt>‘<samp class="samp">2kscope</samp>’</dt>
- <dd><p>2048x858
- </p></dd>
- <dt>‘<samp class="samp">4k</samp>’</dt>
- <dd><p>4096x2160
- </p></dd>
- <dt>‘<samp class="samp">4kflat</samp>’</dt>
- <dd><p>3996x2160
- </p></dd>
- <dt>‘<samp class="samp">4kscope</samp>’</dt>
- <dd><p>4096x1716
- </p></dd>
- <dt>‘<samp class="samp">nhd</samp>’</dt>
- <dd><p>640x360
- </p></dd>
- <dt>‘<samp class="samp">hqvga</samp>’</dt>
- <dd><p>240x160
- </p></dd>
- <dt>‘<samp class="samp">wqvga</samp>’</dt>
- <dd><p>400x240
- </p></dd>
- <dt>‘<samp class="samp">fwqvga</samp>’</dt>
- <dd><p>432x240
- </p></dd>
- <dt>‘<samp class="samp">hvga</samp>’</dt>
- <dd><p>480x320
- </p></dd>
- <dt>‘<samp class="samp">qhd</samp>’</dt>
- <dd><p>960x540
- </p></dd>
- <dt>‘<samp class="samp">2kdci</samp>’</dt>
- <dd><p>2048x1080
- </p></dd>
- <dt>‘<samp class="samp">4kdci</samp>’</dt>
- <dd><p>4096x2160
- </p></dd>
- <dt>‘<samp class="samp">uhd2160</samp>’</dt>
- <dd><p>3840x2160
- </p></dd>
- <dt>‘<samp class="samp">uhd4320</samp>’</dt>
- <dd><p>7680x4320
- </p></dd>
- </dl>
- <a class="anchor" id="video-rate-syntax"></a><a name="Video-rate"></a>
- <h3 class="section">7.5 Video rate<span class="pull-right"><a class="anchor hidden-xs" href="#Video-rate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-rate" aria-hidden="true">TOC</a></span></h3>
- <p>Specify the frame rate of a video, expressed as the number of frames
- generated per second. It has to be a string in the format
- <var class="var">frame_rate_num</var>/<var class="var">frame_rate_den</var>, an integer number, a float
- number or a valid video frame rate abbreviation.
- </p>
- <p>The following abbreviations are recognized:
- </p><dl class="table">
- <dt>‘<samp class="samp">ntsc</samp>’</dt>
- <dd><p>30000/1001
- </p></dd>
- <dt>‘<samp class="samp">pal</samp>’</dt>
- <dd><p>25/1
- </p></dd>
- <dt>‘<samp class="samp">qntsc</samp>’</dt>
- <dd><p>30000/1001
- </p></dd>
- <dt>‘<samp class="samp">qpal</samp>’</dt>
- <dd><p>25/1
- </p></dd>
- <dt>‘<samp class="samp">sntsc</samp>’</dt>
- <dd><p>30000/1001
- </p></dd>
- <dt>‘<samp class="samp">spal</samp>’</dt>
- <dd><p>25/1
- </p></dd>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dd><p>24/1
- </p></dd>
- <dt>‘<samp class="samp">ntsc-film</samp>’</dt>
- <dd><p>24000/1001
- </p></dd>
- </dl>
- <a class="anchor" id="ratio-syntax"></a><a name="Ratio"></a>
- <h3 class="section">7.6 Ratio<span class="pull-right"><a class="anchor hidden-xs" href="#Ratio" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Ratio" aria-hidden="true">TOC</a></span></h3>
- <p>A ratio can be expressed as an expression, or in the form
- <var class="var">numerator</var>:<var class="var">denominator</var>.
- </p>
- <p>Note that a ratio with infinite (1/0) or negative value is
- considered valid, so you should check on the returned value if you
- want to exclude those values.
- </p>
- <p>The undefined value can be expressed using the "0:0" string.
- </p>
- <a class="anchor" id="color-syntax"></a><a name="Color"></a>
- <h3 class="section">7.7 Color<span class="pull-right"><a class="anchor hidden-xs" href="#Color" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Color" aria-hidden="true">TOC</a></span></h3>
- <p>It can be the name of a color as defined below (case insensitive match) or a
- <code class="code">[0x|#]RRGGBB[AA]</code> sequence, possibly followed by @ and a string
- representing the alpha component.
- </p>
- <p>The alpha component may be a string composed by "0x" followed by an
- hexadecimal number or a decimal number between 0.0 and 1.0, which
- represents the opacity value (‘<samp class="samp">0x00</samp>’ or ‘<samp class="samp">0.0</samp>’ means completely
- transparent, ‘<samp class="samp">0xff</samp>’ or ‘<samp class="samp">1.0</samp>’ completely opaque). If the alpha
- component is not specified then ‘<samp class="samp">0xff</samp>’ is assumed.
- </p>
- <p>The string ‘<samp class="samp">random</samp>’ will result in a random color.
- </p>
- <p>The following names of colors are recognized:
- </p><dl class="table">
- <dt>‘<samp class="samp">AliceBlue</samp>’</dt>
- <dd><p>0xF0F8FF
- </p></dd>
- <dt>‘<samp class="samp">AntiqueWhite</samp>’</dt>
- <dd><p>0xFAEBD7
- </p></dd>
- <dt>‘<samp class="samp">Aqua</samp>’</dt>
- <dd><p>0x00FFFF
- </p></dd>
- <dt>‘<samp class="samp">Aquamarine</samp>’</dt>
- <dd><p>0x7FFFD4
- </p></dd>
- <dt>‘<samp class="samp">Azure</samp>’</dt>
- <dd><p>0xF0FFFF
- </p></dd>
- <dt>‘<samp class="samp">Beige</samp>’</dt>
- <dd><p>0xF5F5DC
- </p></dd>
- <dt>‘<samp class="samp">Bisque</samp>’</dt>
- <dd><p>0xFFE4C4
- </p></dd>
- <dt>‘<samp class="samp">Black</samp>’</dt>
- <dd><p>0x000000
- </p></dd>
- <dt>‘<samp class="samp">BlanchedAlmond</samp>’</dt>
- <dd><p>0xFFEBCD
- </p></dd>
- <dt>‘<samp class="samp">Blue</samp>’</dt>
- <dd><p>0x0000FF
- </p></dd>
- <dt>‘<samp class="samp">BlueViolet</samp>’</dt>
- <dd><p>0x8A2BE2
- </p></dd>
- <dt>‘<samp class="samp">Brown</samp>’</dt>
- <dd><p>0xA52A2A
- </p></dd>
- <dt>‘<samp class="samp">BurlyWood</samp>’</dt>
- <dd><p>0xDEB887
- </p></dd>
- <dt>‘<samp class="samp">CadetBlue</samp>’</dt>
- <dd><p>0x5F9EA0
- </p></dd>
- <dt>‘<samp class="samp">Chartreuse</samp>’</dt>
- <dd><p>0x7FFF00
- </p></dd>
- <dt>‘<samp class="samp">Chocolate</samp>’</dt>
- <dd><p>0xD2691E
- </p></dd>
- <dt>‘<samp class="samp">Coral</samp>’</dt>
- <dd><p>0xFF7F50
- </p></dd>
- <dt>‘<samp class="samp">CornflowerBlue</samp>’</dt>
- <dd><p>0x6495ED
- </p></dd>
- <dt>‘<samp class="samp">Cornsilk</samp>’</dt>
- <dd><p>0xFFF8DC
- </p></dd>
- <dt>‘<samp class="samp">Crimson</samp>’</dt>
- <dd><p>0xDC143C
- </p></dd>
- <dt>‘<samp class="samp">Cyan</samp>’</dt>
- <dd><p>0x00FFFF
- </p></dd>
- <dt>‘<samp class="samp">DarkBlue</samp>’</dt>
- <dd><p>0x00008B
- </p></dd>
- <dt>‘<samp class="samp">DarkCyan</samp>’</dt>
- <dd><p>0x008B8B
- </p></dd>
- <dt>‘<samp class="samp">DarkGoldenRod</samp>’</dt>
- <dd><p>0xB8860B
- </p></dd>
- <dt>‘<samp class="samp">DarkGray</samp>’</dt>
- <dd><p>0xA9A9A9
- </p></dd>
- <dt>‘<samp class="samp">DarkGreen</samp>’</dt>
- <dd><p>0x006400
- </p></dd>
- <dt>‘<samp class="samp">DarkKhaki</samp>’</dt>
- <dd><p>0xBDB76B
- </p></dd>
- <dt>‘<samp class="samp">DarkMagenta</samp>’</dt>
- <dd><p>0x8B008B
- </p></dd>
- <dt>‘<samp class="samp">DarkOliveGreen</samp>’</dt>
- <dd><p>0x556B2F
- </p></dd>
- <dt>‘<samp class="samp">Darkorange</samp>’</dt>
- <dd><p>0xFF8C00
- </p></dd>
- <dt>‘<samp class="samp">DarkOrchid</samp>’</dt>
- <dd><p>0x9932CC
- </p></dd>
- <dt>‘<samp class="samp">DarkRed</samp>’</dt>
- <dd><p>0x8B0000
- </p></dd>
- <dt>‘<samp class="samp">DarkSalmon</samp>’</dt>
- <dd><p>0xE9967A
- </p></dd>
- <dt>‘<samp class="samp">DarkSeaGreen</samp>’</dt>
- <dd><p>0x8FBC8F
- </p></dd>
- <dt>‘<samp class="samp">DarkSlateBlue</samp>’</dt>
- <dd><p>0x483D8B
- </p></dd>
- <dt>‘<samp class="samp">DarkSlateGray</samp>’</dt>
- <dd><p>0x2F4F4F
- </p></dd>
- <dt>‘<samp class="samp">DarkTurquoise</samp>’</dt>
- <dd><p>0x00CED1
- </p></dd>
- <dt>‘<samp class="samp">DarkViolet</samp>’</dt>
- <dd><p>0x9400D3
- </p></dd>
- <dt>‘<samp class="samp">DeepPink</samp>’</dt>
- <dd><p>0xFF1493
- </p></dd>
- <dt>‘<samp class="samp">DeepSkyBlue</samp>’</dt>
- <dd><p>0x00BFFF
- </p></dd>
- <dt>‘<samp class="samp">DimGray</samp>’</dt>
- <dd><p>0x696969
- </p></dd>
- <dt>‘<samp class="samp">DodgerBlue</samp>’</dt>
- <dd><p>0x1E90FF
- </p></dd>
- <dt>‘<samp class="samp">FireBrick</samp>’</dt>
- <dd><p>0xB22222
- </p></dd>
- <dt>‘<samp class="samp">FloralWhite</samp>’</dt>
- <dd><p>0xFFFAF0
- </p></dd>
- <dt>‘<samp class="samp">ForestGreen</samp>’</dt>
- <dd><p>0x228B22
- </p></dd>
- <dt>‘<samp class="samp">Fuchsia</samp>’</dt>
- <dd><p>0xFF00FF
- </p></dd>
- <dt>‘<samp class="samp">Gainsboro</samp>’</dt>
- <dd><p>0xDCDCDC
- </p></dd>
- <dt>‘<samp class="samp">GhostWhite</samp>’</dt>
- <dd><p>0xF8F8FF
- </p></dd>
- <dt>‘<samp class="samp">Gold</samp>’</dt>
- <dd><p>0xFFD700
- </p></dd>
- <dt>‘<samp class="samp">GoldenRod</samp>’</dt>
- <dd><p>0xDAA520
- </p></dd>
- <dt>‘<samp class="samp">Gray</samp>’</dt>
- <dd><p>0x808080
- </p></dd>
- <dt>‘<samp class="samp">Green</samp>’</dt>
- <dd><p>0x008000
- </p></dd>
- <dt>‘<samp class="samp">GreenYellow</samp>’</dt>
- <dd><p>0xADFF2F
- </p></dd>
- <dt>‘<samp class="samp">HoneyDew</samp>’</dt>
- <dd><p>0xF0FFF0
- </p></dd>
- <dt>‘<samp class="samp">HotPink</samp>’</dt>
- <dd><p>0xFF69B4
- </p></dd>
- <dt>‘<samp class="samp">IndianRed</samp>’</dt>
- <dd><p>0xCD5C5C
- </p></dd>
- <dt>‘<samp class="samp">Indigo</samp>’</dt>
- <dd><p>0x4B0082
- </p></dd>
- <dt>‘<samp class="samp">Ivory</samp>’</dt>
- <dd><p>0xFFFFF0
- </p></dd>
- <dt>‘<samp class="samp">Khaki</samp>’</dt>
- <dd><p>0xF0E68C
- </p></dd>
- <dt>‘<samp class="samp">Lavender</samp>’</dt>
- <dd><p>0xE6E6FA
- </p></dd>
- <dt>‘<samp class="samp">LavenderBlush</samp>’</dt>
- <dd><p>0xFFF0F5
- </p></dd>
- <dt>‘<samp class="samp">LawnGreen</samp>’</dt>
- <dd><p>0x7CFC00
- </p></dd>
- <dt>‘<samp class="samp">LemonChiffon</samp>’</dt>
- <dd><p>0xFFFACD
- </p></dd>
- <dt>‘<samp class="samp">LightBlue</samp>’</dt>
- <dd><p>0xADD8E6
- </p></dd>
- <dt>‘<samp class="samp">LightCoral</samp>’</dt>
- <dd><p>0xF08080
- </p></dd>
- <dt>‘<samp class="samp">LightCyan</samp>’</dt>
- <dd><p>0xE0FFFF
- </p></dd>
- <dt>‘<samp class="samp">LightGoldenRodYellow</samp>’</dt>
- <dd><p>0xFAFAD2
- </p></dd>
- <dt>‘<samp class="samp">LightGreen</samp>’</dt>
- <dd><p>0x90EE90
- </p></dd>
- <dt>‘<samp class="samp">LightGrey</samp>’</dt>
- <dd><p>0xD3D3D3
- </p></dd>
- <dt>‘<samp class="samp">LightPink</samp>’</dt>
- <dd><p>0xFFB6C1
- </p></dd>
- <dt>‘<samp class="samp">LightSalmon</samp>’</dt>
- <dd><p>0xFFA07A
- </p></dd>
- <dt>‘<samp class="samp">LightSeaGreen</samp>’</dt>
- <dd><p>0x20B2AA
- </p></dd>
- <dt>‘<samp class="samp">LightSkyBlue</samp>’</dt>
- <dd><p>0x87CEFA
- </p></dd>
- <dt>‘<samp class="samp">LightSlateGray</samp>’</dt>
- <dd><p>0x778899
- </p></dd>
- <dt>‘<samp class="samp">LightSteelBlue</samp>’</dt>
- <dd><p>0xB0C4DE
- </p></dd>
- <dt>‘<samp class="samp">LightYellow</samp>’</dt>
- <dd><p>0xFFFFE0
- </p></dd>
- <dt>‘<samp class="samp">Lime</samp>’</dt>
- <dd><p>0x00FF00
- </p></dd>
- <dt>‘<samp class="samp">LimeGreen</samp>’</dt>
- <dd><p>0x32CD32
- </p></dd>
- <dt>‘<samp class="samp">Linen</samp>’</dt>
- <dd><p>0xFAF0E6
- </p></dd>
- <dt>‘<samp class="samp">Magenta</samp>’</dt>
- <dd><p>0xFF00FF
- </p></dd>
- <dt>‘<samp class="samp">Maroon</samp>’</dt>
- <dd><p>0x800000
- </p></dd>
- <dt>‘<samp class="samp">MediumAquaMarine</samp>’</dt>
- <dd><p>0x66CDAA
- </p></dd>
- <dt>‘<samp class="samp">MediumBlue</samp>’</dt>
- <dd><p>0x0000CD
- </p></dd>
- <dt>‘<samp class="samp">MediumOrchid</samp>’</dt>
- <dd><p>0xBA55D3
- </p></dd>
- <dt>‘<samp class="samp">MediumPurple</samp>’</dt>
- <dd><p>0x9370D8
- </p></dd>
- <dt>‘<samp class="samp">MediumSeaGreen</samp>’</dt>
- <dd><p>0x3CB371
- </p></dd>
- <dt>‘<samp class="samp">MediumSlateBlue</samp>’</dt>
- <dd><p>0x7B68EE
- </p></dd>
- <dt>‘<samp class="samp">MediumSpringGreen</samp>’</dt>
- <dd><p>0x00FA9A
- </p></dd>
- <dt>‘<samp class="samp">MediumTurquoise</samp>’</dt>
- <dd><p>0x48D1CC
- </p></dd>
- <dt>‘<samp class="samp">MediumVioletRed</samp>’</dt>
- <dd><p>0xC71585
- </p></dd>
- <dt>‘<samp class="samp">MidnightBlue</samp>’</dt>
- <dd><p>0x191970
- </p></dd>
- <dt>‘<samp class="samp">MintCream</samp>’</dt>
- <dd><p>0xF5FFFA
- </p></dd>
- <dt>‘<samp class="samp">MistyRose</samp>’</dt>
- <dd><p>0xFFE4E1
- </p></dd>
- <dt>‘<samp class="samp">Moccasin</samp>’</dt>
- <dd><p>0xFFE4B5
- </p></dd>
- <dt>‘<samp class="samp">NavajoWhite</samp>’</dt>
- <dd><p>0xFFDEAD
- </p></dd>
- <dt>‘<samp class="samp">Navy</samp>’</dt>
- <dd><p>0x000080
- </p></dd>
- <dt>‘<samp class="samp">OldLace</samp>’</dt>
- <dd><p>0xFDF5E6
- </p></dd>
- <dt>‘<samp class="samp">Olive</samp>’</dt>
- <dd><p>0x808000
- </p></dd>
- <dt>‘<samp class="samp">OliveDrab</samp>’</dt>
- <dd><p>0x6B8E23
- </p></dd>
- <dt>‘<samp class="samp">Orange</samp>’</dt>
- <dd><p>0xFFA500
- </p></dd>
- <dt>‘<samp class="samp">OrangeRed</samp>’</dt>
- <dd><p>0xFF4500
- </p></dd>
- <dt>‘<samp class="samp">Orchid</samp>’</dt>
- <dd><p>0xDA70D6
- </p></dd>
- <dt>‘<samp class="samp">PaleGoldenRod</samp>’</dt>
- <dd><p>0xEEE8AA
- </p></dd>
- <dt>‘<samp class="samp">PaleGreen</samp>’</dt>
- <dd><p>0x98FB98
- </p></dd>
- <dt>‘<samp class="samp">PaleTurquoise</samp>’</dt>
- <dd><p>0xAFEEEE
- </p></dd>
- <dt>‘<samp class="samp">PaleVioletRed</samp>’</dt>
- <dd><p>0xD87093
- </p></dd>
- <dt>‘<samp class="samp">PapayaWhip</samp>’</dt>
- <dd><p>0xFFEFD5
- </p></dd>
- <dt>‘<samp class="samp">PeachPuff</samp>’</dt>
- <dd><p>0xFFDAB9
- </p></dd>
- <dt>‘<samp class="samp">Peru</samp>’</dt>
- <dd><p>0xCD853F
- </p></dd>
- <dt>‘<samp class="samp">Pink</samp>’</dt>
- <dd><p>0xFFC0CB
- </p></dd>
- <dt>‘<samp class="samp">Plum</samp>’</dt>
- <dd><p>0xDDA0DD
- </p></dd>
- <dt>‘<samp class="samp">PowderBlue</samp>’</dt>
- <dd><p>0xB0E0E6
- </p></dd>
- <dt>‘<samp class="samp">Purple</samp>’</dt>
- <dd><p>0x800080
- </p></dd>
- <dt>‘<samp class="samp">Red</samp>’</dt>
- <dd><p>0xFF0000
- </p></dd>
- <dt>‘<samp class="samp">RosyBrown</samp>’</dt>
- <dd><p>0xBC8F8F
- </p></dd>
- <dt>‘<samp class="samp">RoyalBlue</samp>’</dt>
- <dd><p>0x4169E1
- </p></dd>
- <dt>‘<samp class="samp">SaddleBrown</samp>’</dt>
- <dd><p>0x8B4513
- </p></dd>
- <dt>‘<samp class="samp">Salmon</samp>’</dt>
- <dd><p>0xFA8072
- </p></dd>
- <dt>‘<samp class="samp">SandyBrown</samp>’</dt>
- <dd><p>0xF4A460
- </p></dd>
- <dt>‘<samp class="samp">SeaGreen</samp>’</dt>
- <dd><p>0x2E8B57
- </p></dd>
- <dt>‘<samp class="samp">SeaShell</samp>’</dt>
- <dd><p>0xFFF5EE
- </p></dd>
- <dt>‘<samp class="samp">Sienna</samp>’</dt>
- <dd><p>0xA0522D
- </p></dd>
- <dt>‘<samp class="samp">Silver</samp>’</dt>
- <dd><p>0xC0C0C0
- </p></dd>
- <dt>‘<samp class="samp">SkyBlue</samp>’</dt>
- <dd><p>0x87CEEB
- </p></dd>
- <dt>‘<samp class="samp">SlateBlue</samp>’</dt>
- <dd><p>0x6A5ACD
- </p></dd>
- <dt>‘<samp class="samp">SlateGray</samp>’</dt>
- <dd><p>0x708090
- </p></dd>
- <dt>‘<samp class="samp">Snow</samp>’</dt>
- <dd><p>0xFFFAFA
- </p></dd>
- <dt>‘<samp class="samp">SpringGreen</samp>’</dt>
- <dd><p>0x00FF7F
- </p></dd>
- <dt>‘<samp class="samp">SteelBlue</samp>’</dt>
- <dd><p>0x4682B4
- </p></dd>
- <dt>‘<samp class="samp">Tan</samp>’</dt>
- <dd><p>0xD2B48C
- </p></dd>
- <dt>‘<samp class="samp">Teal</samp>’</dt>
- <dd><p>0x008080
- </p></dd>
- <dt>‘<samp class="samp">Thistle</samp>’</dt>
- <dd><p>0xD8BFD8
- </p></dd>
- <dt>‘<samp class="samp">Tomato</samp>’</dt>
- <dd><p>0xFF6347
- </p></dd>
- <dt>‘<samp class="samp">Turquoise</samp>’</dt>
- <dd><p>0x40E0D0
- </p></dd>
- <dt>‘<samp class="samp">Violet</samp>’</dt>
- <dd><p>0xEE82EE
- </p></dd>
- <dt>‘<samp class="samp">Wheat</samp>’</dt>
- <dd><p>0xF5DEB3
- </p></dd>
- <dt>‘<samp class="samp">White</samp>’</dt>
- <dd><p>0xFFFFFF
- </p></dd>
- <dt>‘<samp class="samp">WhiteSmoke</samp>’</dt>
- <dd><p>0xF5F5F5
- </p></dd>
- <dt>‘<samp class="samp">Yellow</samp>’</dt>
- <dd><p>0xFFFF00
- </p></dd>
- <dt>‘<samp class="samp">YellowGreen</samp>’</dt>
- <dd><p>0x9ACD32
- </p></dd>
- </dl>
- <a class="anchor" id="channel-layout-syntax"></a><a name="Channel-Layout"></a>
- <h3 class="section">7.8 Channel Layout<span class="pull-right"><a class="anchor hidden-xs" href="#Channel-Layout" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Channel-Layout" aria-hidden="true">TOC</a></span></h3>
- <p>A channel layout specifies the spatial disposition of the channels in
- a multi-channel audio stream. To specify a channel layout, FFmpeg
- makes use of a special syntax.
- </p>
- <p>Individual channels are identified by an id, as given by the table
- below:
- </p><dl class="table">
- <dt>‘<samp class="samp">FL</samp>’</dt>
- <dd><p>front left
- </p></dd>
- <dt>‘<samp class="samp">FR</samp>’</dt>
- <dd><p>front right
- </p></dd>
- <dt>‘<samp class="samp">FC</samp>’</dt>
- <dd><p>front center
- </p></dd>
- <dt>‘<samp class="samp">LFE</samp>’</dt>
- <dd><p>low frequency
- </p></dd>
- <dt>‘<samp class="samp">BL</samp>’</dt>
- <dd><p>back left
- </p></dd>
- <dt>‘<samp class="samp">BR</samp>’</dt>
- <dd><p>back right
- </p></dd>
- <dt>‘<samp class="samp">FLC</samp>’</dt>
- <dd><p>front left-of-center
- </p></dd>
- <dt>‘<samp class="samp">FRC</samp>’</dt>
- <dd><p>front right-of-center
- </p></dd>
- <dt>‘<samp class="samp">BC</samp>’</dt>
- <dd><p>back center
- </p></dd>
- <dt>‘<samp class="samp">SL</samp>’</dt>
- <dd><p>side left
- </p></dd>
- <dt>‘<samp class="samp">SR</samp>’</dt>
- <dd><p>side right
- </p></dd>
- <dt>‘<samp class="samp">TC</samp>’</dt>
- <dd><p>top center
- </p></dd>
- <dt>‘<samp class="samp">TFL</samp>’</dt>
- <dd><p>top front left
- </p></dd>
- <dt>‘<samp class="samp">TFC</samp>’</dt>
- <dd><p>top front center
- </p></dd>
- <dt>‘<samp class="samp">TFR</samp>’</dt>
- <dd><p>top front right
- </p></dd>
- <dt>‘<samp class="samp">TBL</samp>’</dt>
- <dd><p>top back left
- </p></dd>
- <dt>‘<samp class="samp">TBC</samp>’</dt>
- <dd><p>top back center
- </p></dd>
- <dt>‘<samp class="samp">TBR</samp>’</dt>
- <dd><p>top back right
- </p></dd>
- <dt>‘<samp class="samp">DL</samp>’</dt>
- <dd><p>downmix left
- </p></dd>
- <dt>‘<samp class="samp">DR</samp>’</dt>
- <dd><p>downmix right
- </p></dd>
- <dt>‘<samp class="samp">WL</samp>’</dt>
- <dd><p>wide left
- </p></dd>
- <dt>‘<samp class="samp">WR</samp>’</dt>
- <dd><p>wide right
- </p></dd>
- <dt>‘<samp class="samp">SDL</samp>’</dt>
- <dd><p>surround direct left
- </p></dd>
- <dt>‘<samp class="samp">SDR</samp>’</dt>
- <dd><p>surround direct right
- </p></dd>
- <dt>‘<samp class="samp">LFE2</samp>’</dt>
- <dd><p>low frequency 2
- </p></dd>
- </dl>
- <p>Standard channel layout compositions can be specified by using the
- following identifiers:
- </p><dl class="table">
- <dt>‘<samp class="samp">mono</samp>’</dt>
- <dd><p>FC
- </p></dd>
- <dt>‘<samp class="samp">stereo</samp>’</dt>
- <dd><p>FL+FR
- </p></dd>
- <dt>‘<samp class="samp">2.1</samp>’</dt>
- <dd><p>FL+FR+LFE
- </p></dd>
- <dt>‘<samp class="samp">3.0</samp>’</dt>
- <dd><p>FL+FR+FC
- </p></dd>
- <dt>‘<samp class="samp">3.0(back)</samp>’</dt>
- <dd><p>FL+FR+BC
- </p></dd>
- <dt>‘<samp class="samp">4.0</samp>’</dt>
- <dd><p>FL+FR+FC+BC
- </p></dd>
- <dt>‘<samp class="samp">quad</samp>’</dt>
- <dd><p>FL+FR+BL+BR
- </p></dd>
- <dt>‘<samp class="samp">quad(side)</samp>’</dt>
- <dd><p>FL+FR+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">3.1</samp>’</dt>
- <dd><p>FL+FR+FC+LFE
- </p></dd>
- <dt>‘<samp class="samp">5.0</samp>’</dt>
- <dd><p>FL+FR+FC+BL+BR
- </p></dd>
- <dt>‘<samp class="samp">5.0(side)</samp>’</dt>
- <dd><p>FL+FR+FC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">4.1</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BC
- </p></dd>
- <dt>‘<samp class="samp">5.1</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR
- </p></dd>
- <dt>‘<samp class="samp">5.1(side)</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">6.0</samp>’</dt>
- <dd><p>FL+FR+FC+BC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">6.0(front)</samp>’</dt>
- <dd><p>FL+FR+FLC+FRC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">3.1.2</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+TFL+TFR
- </p></dd>
- <dt>‘<samp class="samp">hexagonal</samp>’</dt>
- <dd><p>FL+FR+FC+BL+BR+BC
- </p></dd>
- <dt>‘<samp class="samp">6.1</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">6.1</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+BC
- </p></dd>
- <dt>‘<samp class="samp">6.1(front)</samp>’</dt>
- <dd><p>FL+FR+LFE+FLC+FRC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">7.0</samp>’</dt>
- <dd><p>FL+FR+FC+BL+BR+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">7.0(front)</samp>’</dt>
- <dd><p>FL+FR+FC+FLC+FRC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">7.1</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">7.1(wide)</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC
- </p></dd>
- <dt>‘<samp class="samp">7.1(wide-side)</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+FLC+FRC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">5.1.2</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+TFL+TFR
- </p></dd>
- <dt>‘<samp class="samp">octagonal</samp>’</dt>
- <dd><p>FL+FR+FC+BL+BR+BC+SL+SR
- </p></dd>
- <dt>‘<samp class="samp">cube</samp>’</dt>
- <dd><p>FL+FR+BL+BR+TFL+TFR+TBL+TBR
- </p></dd>
- <dt>‘<samp class="samp">5.1.4</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+TFL+TFR+TBL+TBR
- </p></dd>
- <dt>‘<samp class="samp">7.1.2</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR
- </p></dd>
- <dt>‘<samp class="samp">7.1.4</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBL+TBR
- </p></dd>
- <dt>‘<samp class="samp">7.2.3</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBC+LFE2
- </p></dd>
- <dt>‘<samp class="samp">9.1.4</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR
- </p></dd>
- <dt>‘<samp class="samp">9.1.6</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR+TSL+TSR
- </p></dd>
- <dt>‘<samp class="samp">hexadecagonal</samp>’</dt>
- <dd><p>FL+FR+FC+BL+BR+BC+SL+SR+WL+WR+TBL+TBR+TBC+TFC+TFL+TFR
- </p></dd>
- <dt>‘<samp class="samp">binaural</samp>’</dt>
- <dd><p>BIL+BIR
- </p></dd>
- <dt>‘<samp class="samp">downmix</samp>’</dt>
- <dd><p>DL+DR
- </p></dd>
- <dt>‘<samp class="samp">22.2</samp>’</dt>
- <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+LFE2+TSL+TSR+BFC+BFL+BFR
- </p></dd>
- </dl>
- <p>A custom channel layout can be specified as a sequence of terms, separated by ’+’.
- Each term can be:
- </p><ul class="itemize mark-bullet">
- <li>the name of a single channel (e.g. ‘<samp class="samp">FL</samp>’, ‘<samp class="samp">FR</samp>’, ‘<samp class="samp">FC</samp>’, ‘<samp class="samp">LFE</samp>’, etc.),
- each optionally containing a custom name after a ’@’, (e.g. ‘<samp class="samp">FL@Left</samp>’,
- ‘<samp class="samp">FR@Right</samp>’, ‘<samp class="samp">FC@Center</samp>’, ‘<samp class="samp">LFE@Low_Frequency</samp>’, etc.)
- </li></ul>
- <p>A standard channel layout can be specified by the following:
- </p><ul class="itemize mark-bullet">
- <li>the name of a single channel (e.g. ‘<samp class="samp">FL</samp>’, ‘<samp class="samp">FR</samp>’, ‘<samp class="samp">FC</samp>’, ‘<samp class="samp">LFE</samp>’, etc.)
- </li><li>the name of a standard channel layout (e.g. ‘<samp class="samp">mono</samp>’,
- ‘<samp class="samp">stereo</samp>’, ‘<samp class="samp">4.0</samp>’, ‘<samp class="samp">quad</samp>’, ‘<samp class="samp">5.0</samp>’, etc.)
- </li><li>a number of channels, in decimal, followed by ’c’, yielding the default channel
- layout for that number of channels (see the function
- <code class="code">av_channel_layout_default</code>). Note that not all channel counts have a
- default layout.
- </li><li>a number of channels, in decimal, followed by ’C’, yielding an unknown channel
- layout with the specified number of channels. Note that not all channel layout
- specification strings support unknown channel layouts.
- </li><li>a channel layout mask, in hexadecimal starting with "0x" (see the
- <code class="code">AV_CH_*</code> macros in <samp class="file">libavutil/channel_layout.h</samp>.
- </li></ul>
- <p>Before libavutil version 53 the trailing character "c" to specify a number of
- channels was optional, but now it is required, while a channel layout mask can
- also be specified as a decimal number (if and only if not followed by "c" or "C").
- </p>
- <p>See also the function <code class="code">av_channel_layout_from_string</code> defined in
- <samp class="file">libavutil/channel_layout.h</samp>.
- </p>
- <a name="Expression-Evaluation"></a>
- <h2 class="chapter">8 Expression Evaluation<span class="pull-right"><a class="anchor hidden-xs" href="#Expression-Evaluation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Expression-Evaluation" aria-hidden="true">TOC</a></span></h2>
- <p>When evaluating an arithmetic expression, FFmpeg uses an internal
- formula evaluator, implemented through the <samp class="file">libavutil/eval.h</samp>
- interface.
- </p>
- <p>An expression may contain unary, binary operators, constants, and
- functions.
- </p>
- <p>Two expressions <var class="var">expr1</var> and <var class="var">expr2</var> can be combined to form
- another expression "<var class="var">expr1</var>;<var class="var">expr2</var>".
- <var class="var">expr1</var> and <var class="var">expr2</var> are evaluated in turn, and the new
- expression evaluates to the value of <var class="var">expr2</var>.
- </p>
- <p>The following binary operators are available: <code class="code">+</code>, <code class="code">-</code>,
- <code class="code">*</code>, <code class="code">/</code>, <code class="code">^</code>.
- </p>
- <p>The following unary operators are available: <code class="code">+</code>, <code class="code">-</code>.
- </p>
- <p>Some internal variables can be used to store and load intermediary
- results. They can be accessed using the <code class="code">ld</code> and <code class="code">st</code>
- functions with an index argument varying from 0 to 9 to specify which
- internal variable to access.
- </p>
- <p>The following functions are available:
- </p><dl class="table">
- <dt><samp class="option">abs(x)</samp></dt>
- <dd><p>Compute absolute value of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">acos(x)</samp></dt>
- <dd><p>Compute arccosine of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">asin(x)</samp></dt>
- <dd><p>Compute arcsine of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">atan(x)</samp></dt>
- <dd><p>Compute arctangent of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">atan2(y, x)</samp></dt>
- <dd><p>Compute principal value of the arc tangent of <var class="var">y</var>/<var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">between(x, min, max)</samp></dt>
- <dd><p>Return 1 if <var class="var">x</var> is greater than or equal to <var class="var">min</var> and lesser than or
- equal to <var class="var">max</var>, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">bitand(x, y)</samp></dt>
- <dt><samp class="option">bitor(x, y)</samp></dt>
- <dd><p>Compute bitwise and/or operation on <var class="var">x</var> and <var class="var">y</var>.
- </p>
- <p>The results of the evaluation of <var class="var">x</var> and <var class="var">y</var> are converted to
- integers before executing the bitwise operation.
- </p>
- <p>Note that both the conversion to integer and the conversion back to
- floating point can lose precision. Beware of unexpected results for
- large numbers (usually 2^53 and larger).
- </p>
- </dd>
- <dt><samp class="option">ceil(expr)</samp></dt>
- <dd><p>Round the value of expression <var class="var">expr</var> upwards to the nearest
- integer. For example, "ceil(1.5)" is "2.0".
- </p>
- </dd>
- <dt><samp class="option">clip(x, min, max)</samp></dt>
- <dd><p>Return the value of <var class="var">x</var> clipped between <var class="var">min</var> and <var class="var">max</var>.
- </p>
- </dd>
- <dt><samp class="option">cos(x)</samp></dt>
- <dd><p>Compute cosine of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">cosh(x)</samp></dt>
- <dd><p>Compute hyperbolic cosine of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">eq(x, y)</samp></dt>
- <dd><p>Return 1 if <var class="var">x</var> and <var class="var">y</var> are equivalent, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">exp(x)</samp></dt>
- <dd><p>Compute exponential of <var class="var">x</var> (with base <code class="code">e</code>, the Euler’s number).
- </p>
- </dd>
- <dt><samp class="option">floor(expr)</samp></dt>
- <dd><p>Round the value of expression <var class="var">expr</var> downwards to the nearest
- integer. For example, "floor(-1.5)" is "-2.0".
- </p>
- </dd>
- <dt><samp class="option">gauss(x)</samp></dt>
- <dd><p>Compute Gauss function of <var class="var">x</var>, corresponding to
- <code class="code">exp(-x*x/2) / sqrt(2*PI)</code>.
- </p>
- </dd>
- <dt><samp class="option">gcd(x, y)</samp></dt>
- <dd><p>Return the greatest common divisor of <var class="var">x</var> and <var class="var">y</var>. If both <var class="var">x</var> and
- <var class="var">y</var> are 0 or either or both are less than zero then behavior is undefined.
- </p>
- </dd>
- <dt><samp class="option">gt(x, y)</samp></dt>
- <dd><p>Return 1 if <var class="var">x</var> is greater than <var class="var">y</var>, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">gte(x, y)</samp></dt>
- <dd><p>Return 1 if <var class="var">x</var> is greater than or equal to <var class="var">y</var>, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">hypot(x, y)</samp></dt>
- <dd><p>This function is similar to the C function with the same name; it returns
- "sqrt(<var class="var">x</var>*<var class="var">x</var> + <var class="var">y</var>*<var class="var">y</var>)", the length of the hypotenuse of a
- right triangle with sides of length <var class="var">x</var> and <var class="var">y</var>, or the distance of the
- point (<var class="var">x</var>, <var class="var">y</var>) from the origin.
- </p>
- </dd>
- <dt><samp class="option">if(x, y)</samp></dt>
- <dd><p>Evaluate <var class="var">x</var>, and if the result is non-zero return the result of
- the evaluation of <var class="var">y</var>, return 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">if(x, y, z)</samp></dt>
- <dd><p>Evaluate <var class="var">x</var>, and if the result is non-zero return the evaluation
- result of <var class="var">y</var>, otherwise the evaluation result of <var class="var">z</var>.
- </p>
- </dd>
- <dt><samp class="option">ifnot(x, y)</samp></dt>
- <dd><p>Evaluate <var class="var">x</var>, and if the result is zero return the result of the
- evaluation of <var class="var">y</var>, return 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">ifnot(x, y, z)</samp></dt>
- <dd><p>Evaluate <var class="var">x</var>, and if the result is zero return the evaluation
- result of <var class="var">y</var>, otherwise the evaluation result of <var class="var">z</var>.
- </p>
- </dd>
- <dt><samp class="option">isinf(x)</samp></dt>
- <dd><p>Return 1.0 if <var class="var">x</var> is +/-INFINITY, 0.0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">isnan(x)</samp></dt>
- <dd><p>Return 1.0 if <var class="var">x</var> is NAN, 0.0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">ld(idx)</samp></dt>
- <dd><p>Load the value of the internal variable with index <var class="var">idx</var>, which was
- previously stored with st(<var class="var">idx</var>, <var class="var">expr</var>).
- The function returns the loaded value.
- </p>
- </dd>
- <dt><samp class="option">lerp(x, y, z)</samp></dt>
- <dd><p>Return linear interpolation between <var class="var">x</var> and <var class="var">y</var> by amount of <var class="var">z</var>.
- </p>
- </dd>
- <dt><samp class="option">log(x)</samp></dt>
- <dd><p>Compute natural logarithm of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">lt(x, y)</samp></dt>
- <dd><p>Return 1 if <var class="var">x</var> is lesser than <var class="var">y</var>, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">lte(x, y)</samp></dt>
- <dd><p>Return 1 if <var class="var">x</var> is lesser than or equal to <var class="var">y</var>, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">max(x, y)</samp></dt>
- <dd><p>Return the maximum between <var class="var">x</var> and <var class="var">y</var>.
- </p>
- </dd>
- <dt><samp class="option">min(x, y)</samp></dt>
- <dd><p>Return the minimum between <var class="var">x</var> and <var class="var">y</var>.
- </p>
- </dd>
- <dt><samp class="option">mod(x, y)</samp></dt>
- <dd><p>Compute the remainder of division of <var class="var">x</var> by <var class="var">y</var>.
- </p>
- </dd>
- <dt><samp class="option">not(expr)</samp></dt>
- <dd><p>Return 1.0 if <var class="var">expr</var> is zero, 0.0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">pow(x, y)</samp></dt>
- <dd><p>Compute the power of <var class="var">x</var> elevated <var class="var">y</var>, it is equivalent to
- "(<var class="var">x</var>)^(<var class="var">y</var>)".
- </p>
- </dd>
- <dt><samp class="option">print(t)</samp></dt>
- <dt><samp class="option">print(t, l)</samp></dt>
- <dd><p>Print the value of expression <var class="var">t</var> with loglevel <var class="var">l</var>. If <var class="var">l</var> is not
- specified then a default log level is used.
- Return the value of the expression printed.
- </p>
- </dd>
- <dt><samp class="option">random(idx)</samp></dt>
- <dd><p>Return a pseudo random value between 0.0 and 1.0. <var class="var">idx</var> is the
- index of the internal variable used to save the seed/state, which can be
- previously stored with <code class="code">st(idx)</code>.
- </p>
- <p>To initialize the seed, you need to store the seed value as a 64-bit
- unsigned integer in the internal variable with index <var class="var">idx</var>.
- </p>
- <p>For example, to store the seed with value <code class="code">42</code> in the internal
- variable with index <code class="code">0</code> and print a few random values:
- </p><div class="example">
- <pre class="example-preformatted">st(0,42); print(random(0)); print(random(0)); print(random(0))
- </pre></div>
- </dd>
- <dt><samp class="option">randomi(idx, min, max)</samp></dt>
- <dd><p>Return a pseudo random value in the interval between <var class="var">min</var> and
- <var class="var">max</var>. <var class="var">idx</var> is the index of the internal variable which will be used to
- save the seed/state, which can be previously stored with <code class="code">st(idx)</code>.
- </p>
- <p>To initialize the seed, you need to store the seed value as a 64-bit
- unsigned integer in the internal variable with index <var class="var">idx</var>.
- </p>
- </dd>
- <dt><samp class="option">root(expr, max)</samp></dt>
- <dd><p>Find an input value for which the function represented by <var class="var">expr</var>
- with argument <var class="var">ld(0)</var> is 0 in the interval 0..<var class="var">max</var>.
- </p>
- <p>The expression in <var class="var">expr</var> must denote a continuous function or the
- result is undefined.
- </p>
- <p><var class="var">ld(0)</var> is used to represent the function input value, which means that the
- given expression will be evaluated multiple times with various input values that
- the expression can access through <code class="code">ld(0)</code>. When the expression evaluates to
- 0 then the corresponding input value will be returned.
- </p>
- </dd>
- <dt><samp class="option">round(expr)</samp></dt>
- <dd><p>Round the value of expression <var class="var">expr</var> to the nearest integer. For example,
- "round(1.5)" is "2.0".
- </p>
- </dd>
- <dt><samp class="option">sgn(x)</samp></dt>
- <dd><p>Compute sign of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">sin(x)</samp></dt>
- <dd><p>Compute sine of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">sinh(x)</samp></dt>
- <dd><p>Compute hyperbolic sine of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">sqrt(expr)</samp></dt>
- <dd><p>Compute the square root of <var class="var">expr</var>. This is equivalent to
- "(<var class="var">expr</var>)^.5".
- </p>
- </dd>
- <dt><samp class="option">squish(x)</samp></dt>
- <dd><p>Compute expression <code class="code">1/(1 + exp(4*x))</code>.
- </p>
- </dd>
- <dt><samp class="option">st(idx, expr)</samp></dt>
- <dd><p>Store the value of the expression <var class="var">expr</var> in an internal
- variable. <var class="var">idx</var> specifies the index of the variable where to store
- the value, and it is a value ranging from 0 to 9. The function returns
- the value stored in the internal variable.
- </p>
- <p>The stored value can be retrieved with <code class="code">ld(var)</code>.
- </p>
- <p>Note: variables are currently not shared between expressions.
- </p>
- </dd>
- <dt><samp class="option">tan(x)</samp></dt>
- <dd><p>Compute tangent of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">tanh(x)</samp></dt>
- <dd><p>Compute hyperbolic tangent of <var class="var">x</var>.
- </p>
- </dd>
- <dt><samp class="option">taylor(expr, x)</samp></dt>
- <dt><samp class="option">taylor(expr, x, idx)</samp></dt>
- <dd><p>Evaluate a Taylor series at <var class="var">x</var>, given an expression representing
- the <code class="code">ld(idx)</code>-th derivative of a function at 0.
- </p>
- <p>When the series does not converge the result is undefined.
- </p>
- <p><var class="var">ld(idx)</var> is used to represent the derivative order in <var class="var">expr</var>,
- which means that the given expression will be evaluated multiple times
- with various input values that the expression can access through
- <code class="code">ld(idx)</code>. If <var class="var">idx</var> is not specified then 0 is assumed.
- </p>
- <p>Note, when you have the derivatives at y instead of 0,
- <code class="code">taylor(expr, x-y)</code> can be used.
- </p>
- </dd>
- <dt><samp class="option">time(0)</samp></dt>
- <dd><p>Return the current (wallclock) time in seconds.
- </p>
- </dd>
- <dt><samp class="option">trunc(expr)</samp></dt>
- <dd><p>Round the value of expression <var class="var">expr</var> towards zero to the nearest
- integer. For example, "trunc(-1.5)" is "-1.0".
- </p>
- </dd>
- <dt><samp class="option">while(cond, expr)</samp></dt>
- <dd><p>Evaluate expression <var class="var">expr</var> while the expression <var class="var">cond</var> is
- non-zero, and returns the value of the last <var class="var">expr</var> evaluation, or
- NAN if <var class="var">cond</var> was always false.
- </p></dd>
- </dl>
- <p>The following constants are available:
- </p><dl class="table">
- <dt><samp class="option">PI</samp></dt>
- <dd><p>area of the unit disc, approximately 3.14
- </p></dd>
- <dt><samp class="option">E</samp></dt>
- <dd><p>exp(1) (Euler’s number), approximately 2.718
- </p></dd>
- <dt><samp class="option">PHI</samp></dt>
- <dd><p>golden ratio (1+sqrt(5))/2, approximately 1.618
- </p></dd>
- </dl>
- <p>Assuming that an expression is considered "true" if it has a non-zero
- value, note that:
- </p>
- <p><code class="code">*</code> works like AND
- </p>
- <p><code class="code">+</code> works like OR
- </p>
- <p>For example the construct:
- </p><div class="example">
- <pre class="example-preformatted">if (A AND B) then C
- </pre></div>
- <p>is equivalent to:
- </p><div class="example">
- <pre class="example-preformatted">if(A*B, C)
- </pre></div>
- <p>In your C code, you can extend the list of unary and binary functions,
- and define recognized constants, so that they are available for your
- expressions.
- </p>
- <p>The evaluator also recognizes the International System unit prefixes.
- If ’i’ is appended after the prefix, binary prefixes are used, which
- are based on powers of 1024 instead of powers of 1000.
- The ’B’ postfix multiplies the value by 8, and can be appended after a
- unit prefix or used alone. This allows using for example ’KB’, ’MiB’,
- ’G’ and ’B’ as number postfix.
- </p>
- <p>The list of available International System prefixes follows, with
- indication of the corresponding powers of 10 and of 2.
- </p><dl class="table">
- <dt><samp class="option">y</samp></dt>
- <dd><p>10^-24 / 2^-80
- </p></dd>
- <dt><samp class="option">z</samp></dt>
- <dd><p>10^-21 / 2^-70
- </p></dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>10^-18 / 2^-60
- </p></dd>
- <dt><samp class="option">f</samp></dt>
- <dd><p>10^-15 / 2^-50
- </p></dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>10^-12 / 2^-40
- </p></dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>10^-9 / 2^-30
- </p></dd>
- <dt><samp class="option">u</samp></dt>
- <dd><p>10^-6 / 2^-20
- </p></dd>
- <dt><samp class="option">m</samp></dt>
- <dd><p>10^-3 / 2^-10
- </p></dd>
- <dt><samp class="option">c</samp></dt>
- <dd><p>10^-2
- </p></dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>10^-1
- </p></dd>
- <dt><samp class="option">h</samp></dt>
- <dd><p>10^2
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>10^3 / 2^10
- </p></dd>
- <dt><samp class="option">K</samp></dt>
- <dd><p>10^3 / 2^10
- </p></dd>
- <dt><samp class="option">M</samp></dt>
- <dd><p>10^6 / 2^20
- </p></dd>
- <dt><samp class="option">G</samp></dt>
- <dd><p>10^9 / 2^30
- </p></dd>
- <dt><samp class="option">T</samp></dt>
- <dd><p>10^12 / 2^40
- </p></dd>
- <dt><samp class="option">P</samp></dt>
- <dd><p>10^15 / 2^50
- </p></dd>
- <dt><samp class="option">E</samp></dt>
- <dd><p>10^18 / 2^60
- </p></dd>
- <dt><samp class="option">Z</samp></dt>
- <dd><p>10^21 / 2^70
- </p></dd>
- <dt><samp class="option">Y</samp></dt>
- <dd><p>10^24 / 2^80
- </p></dd>
- </dl>
- <a class="anchor" id="codec_002doptions"></a><a name="Codec-Options"></a>
- <h2 class="chapter">9 Codec Options<span class="pull-right"><a class="anchor hidden-xs" href="#Codec-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Codec-Options" aria-hidden="true">TOC</a></span></h2>
- <p>libavcodec provides some generic global options, which can be set on
- all the encoders and decoders. In addition, each codec may support
- so-called private options, which are specific for a given codec.
- </p>
- <p>Sometimes, a global option may only affect a specific kind of codec,
- and may be nonsensical or ignored by another, so you need to be aware
- of the meaning of the specified options. Also some options are
- meant only for decoding or encoding.
- </p>
- <p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
- FFmpeg tools, or by setting the value explicitly in the
- <code class="code">AVCodecContext</code> options or using the <samp class="file">libavutil/opt.h</samp> API
- for programmatic use.
- </p>
- <p>The list of supported options follow:
- </p>
- <dl class="table">
- <dt><samp class="option">b <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd><p>Set bitrate in bits/s. Default value is 200K.
- </p>
- </dd>
- <dt><samp class="option">ab <var class="var">integer</var> (<em class="emph">encoding,audio</em>)</samp></dt>
- <dd><p>Set audio bitrate (in bits/s). Default value is 128K.
- </p>
- </dd>
- <dt><samp class="option">bt <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate
- tolerance specifies how far ratecontrol is willing to deviate from the
- target average bitrate value. This is not related to min/max
- bitrate. Lowering tolerance too much has an adverse effect on quality.
- </p>
- </dd>
- <dt><samp class="option">flags <var class="var">flags</var> (<em class="emph">decoding/encoding,audio,video,subtitles</em>)</samp></dt>
- <dd><p>Set generic flags.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">mv4</samp>’</dt>
- <dd><p>Use four motion vector by macroblock (mpeg4).
- </p></dd>
- <dt>‘<samp class="samp">qpel</samp>’</dt>
- <dd><p>Use 1/4 pel motion compensation.
- </p></dd>
- <dt>‘<samp class="samp">loop</samp>’</dt>
- <dd><p>Use loop filter.
- </p></dd>
- <dt>‘<samp class="samp">qscale</samp>’</dt>
- <dd><p>Use fixed qscale.
- </p></dd>
- <dt>‘<samp class="samp">pass1</samp>’</dt>
- <dd><p>Use internal 2pass ratecontrol in first pass mode.
- </p></dd>
- <dt>‘<samp class="samp">pass2</samp>’</dt>
- <dd><p>Use internal 2pass ratecontrol in second pass mode.
- </p></dd>
- <dt>‘<samp class="samp">gray</samp>’</dt>
- <dd><p>Only decode/encode grayscale.
- </p></dd>
- <dt>‘<samp class="samp">psnr</samp>’</dt>
- <dd><p>Set error[?] variables during encoding.
- </p></dd>
- <dt>‘<samp class="samp">truncated</samp>’</dt>
- <dd><p>Input bitstream might be randomly truncated.
- </p></dd>
- <dt>‘<samp class="samp">drop_changed</samp>’</dt>
- <dd><p>Don’t output frames whose parameters differ from first decoded frame in stream.
- Error AVERROR_INPUT_CHANGED is returned when a frame is dropped.
- </p>
- </dd>
- <dt>‘<samp class="samp">ildct</samp>’</dt>
- <dd><p>Use interlaced DCT.
- </p></dd>
- <dt>‘<samp class="samp">low_delay</samp>’</dt>
- <dd><p>Force low delay.
- </p></dd>
- <dt>‘<samp class="samp">global_header</samp>’</dt>
- <dd><p>Place global headers in extradata instead of every keyframe.
- </p></dd>
- <dt>‘<samp class="samp">bitexact</samp>’</dt>
- <dd><p>Only write platform-, build- and time-independent data. (except (I)DCT).
- This ensures that file and data checksums are reproducible and match between
- platforms. Its primary use is for regression testing.
- </p></dd>
- <dt>‘<samp class="samp">aic</samp>’</dt>
- <dd><p>Apply H263 advanced intra coding / mpeg4 ac prediction.
- </p></dd>
- <dt>‘<samp class="samp">ilme</samp>’</dt>
- <dd><p>Apply interlaced motion estimation.
- </p></dd>
- <dt>‘<samp class="samp">cgop</samp>’</dt>
- <dd><p>Use closed gop.
- </p></dd>
- <dt>‘<samp class="samp">output_corrupt</samp>’</dt>
- <dd><p>Output even potentially corrupted frames.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">time_base <var class="var">rational number</var></samp></dt>
- <dd><p>Set codec time base.
- </p>
- <p>It is the fundamental unit of time (in seconds) in terms of which
- frame timestamps are represented. For fixed-fps content, timebase
- should be <code class="code">1 / frame_rate</code> and timestamp increments should be
- identically 1.
- </p>
- </dd>
- <dt><samp class="option">g <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set the group of picture (GOP) size. Default value is 12.
- </p>
- </dd>
- <dt><samp class="option">ar <var class="var">integer</var> (<em class="emph">decoding/encoding,audio</em>)</samp></dt>
- <dd><p>Set audio sampling rate (in Hz).
- </p>
- </dd>
- <dt><samp class="option">ac <var class="var">integer</var> (<em class="emph">decoding/encoding,audio</em>)</samp></dt>
- <dd><p>Set number of audio channels.
- </p>
- </dd>
- <dt><samp class="option">cutoff <var class="var">integer</var> (<em class="emph">encoding,audio</em>)</samp></dt>
- <dd><p>Set cutoff bandwidth. (Supported only by selected encoders, see
- their respective documentation sections.)
- </p>
- </dd>
- <dt><samp class="option">frame_size <var class="var">integer</var> (<em class="emph">encoding,audio</em>)</samp></dt>
- <dd><p>Set audio frame size.
- </p>
- <p>Each submitted frame except the last must contain exactly frame_size
- samples per channel. May be 0 when the codec has
- CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is not
- restricted. It is set by some decoders to indicate constant frame
- size.
- </p>
- </dd>
- <dt><samp class="option">frame_number <var class="var">integer</var></samp></dt>
- <dd><p>Set the frame number.
- </p>
- </dd>
- <dt><samp class="option">delay <var class="var">integer</var></samp></dt>
- <dt><samp class="option">qcomp <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set video quantizer scale compression (VBR). It is used as a constant
- in the ratecontrol equation. Recommended range for default rc_eq:
- 0.0-1.0.
- </p>
- </dd>
- <dt><samp class="option">qblur <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set video quantizer scale blur (VBR).
- </p>
- </dd>
- <dt><samp class="option">qmin <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set min video quantizer scale (VBR). Must be included between -1 and
- 69, default value is 2.
- </p>
- </dd>
- <dt><samp class="option">qmax <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set max video quantizer scale (VBR). Must be included between -1 and
- 1024, default value is 31.
- </p>
- </dd>
- <dt><samp class="option">qdiff <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set max difference between the quantizer scale (VBR).
- </p>
- </dd>
- <dt><samp class="option">bf <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set max number of B frames between non-B-frames.
- </p>
- <p>Must be an integer between -1 and 16. 0 means that B-frames are
- disabled. If a value of -1 is used, it will choose an automatic value
- depending on the encoder.
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">b_qfactor <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set qp factor between P and B frames.
- </p>
- </dd>
- <dt><samp class="option">codec_tag <var class="var">integer</var></samp></dt>
- <dt><samp class="option">bug <var class="var">flags</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd><p>Workaround not auto detected encoder bugs.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">autodetect</samp>’</dt>
- <dt>‘<samp class="samp">xvid_ilace</samp>’</dt>
- <dd><p>Xvid interlacing bug (autodetected if fourcc==XVIX)
- </p></dd>
- <dt>‘<samp class="samp">ump4</samp>’</dt>
- <dd><p>(autodetected if fourcc==UMP4)
- </p></dd>
- <dt>‘<samp class="samp">no_padding</samp>’</dt>
- <dd><p>padding bug (autodetected)
- </p></dd>
- <dt>‘<samp class="samp">amv</samp>’</dt>
- <dt>‘<samp class="samp">qpel_chroma</samp>’</dt>
- <dt>‘<samp class="samp">std_qpel</samp>’</dt>
- <dd><p>old standard qpel (autodetected per fourcc/version)
- </p></dd>
- <dt>‘<samp class="samp">qpel_chroma2</samp>’</dt>
- <dt>‘<samp class="samp">direct_blocksize</samp>’</dt>
- <dd><p>direct-qpel-blocksize bug (autodetected per fourcc/version)
- </p></dd>
- <dt>‘<samp class="samp">edge</samp>’</dt>
- <dd><p>edge padding bug (autodetected per fourcc/version)
- </p></dd>
- <dt>‘<samp class="samp">hpel_chroma</samp>’</dt>
- <dt>‘<samp class="samp">dc_clip</samp>’</dt>
- <dt>‘<samp class="samp">ms</samp>’</dt>
- <dd><p>Workaround various bugs in microsoft broken decoders.
- </p></dd>
- <dt>‘<samp class="samp">trunc</samp>’</dt>
- <dd><p>trancated frames
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">strict <var class="var">integer</var> (<em class="emph">decoding/encoding,audio,video</em>)</samp></dt>
- <dd><p>Specify how strictly to follow the standards.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">very</samp>’</dt>
- <dd><p>strictly conform to an older more strict version of the spec or reference software
- </p></dd>
- <dt>‘<samp class="samp">strict</samp>’</dt>
- <dd><p>strictly conform to all the things in the spec no matter what consequences
- </p></dd>
- <dt>‘<samp class="samp">normal</samp>’</dt>
- <dt>‘<samp class="samp">unofficial</samp>’</dt>
- <dd><p>allow unofficial extensions
- </p></dd>
- <dt>‘<samp class="samp">experimental</samp>’</dt>
- <dd><p>allow non standardized experimental things, experimental
- (unfinished/work in progress/not well tested) decoders and encoders.
- Note: experimental decoders can pose a security risk, do not use this for
- decoding untrusted input.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">b_qoffset <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set QP offset between P and B frames.
- </p>
- </dd>
- <dt><samp class="option">err_detect <var class="var">flags</var> (<em class="emph">decoding,audio,video</em>)</samp></dt>
- <dd><p>Set error detection flags.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">crccheck</samp>’</dt>
- <dd><p>verify embedded CRCs
- </p></dd>
- <dt>‘<samp class="samp">bitstream</samp>’</dt>
- <dd><p>detect bitstream specification deviations
- </p></dd>
- <dt>‘<samp class="samp">buffer</samp>’</dt>
- <dd><p>detect improper bitstream length
- </p></dd>
- <dt>‘<samp class="samp">explode</samp>’</dt>
- <dd><p>abort decoding on minor error detection
- </p></dd>
- <dt>‘<samp class="samp">ignore_err</samp>’</dt>
- <dd><p>ignore decoding errors, and continue decoding.
- This is useful if you want to analyze the content of a video and thus want
- everything to be decoded no matter what. This option will not result in a video
- that is pleasing to watch in case of errors.
- </p></dd>
- <dt>‘<samp class="samp">careful</samp>’</dt>
- <dd><p>consider things that violate the spec and have not been seen in the wild as errors
- </p></dd>
- <dt>‘<samp class="samp">compliant</samp>’</dt>
- <dd><p>consider all spec non compliancies as errors
- </p></dd>
- <dt>‘<samp class="samp">aggressive</samp>’</dt>
- <dd><p>consider things that a sane encoder should not do as an error
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">has_b_frames <var class="var">integer</var></samp></dt>
- <dt><samp class="option">block_align <var class="var">integer</var></samp></dt>
- <dt><samp class="option">rc_override_count <var class="var">integer</var></samp></dt>
- <dt><samp class="option">maxrate <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd><p>Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
- </p>
- </dd>
- <dt><samp class="option">minrate <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd><p>Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR
- encode. It is of little use elsewise.
- </p>
- </dd>
- <dt><samp class="option">bufsize <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd><p>Set ratecontrol buffer size (in bits).
- </p>
- </dd>
- <dt><samp class="option">i_qfactor <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set QP factor between P and I frames.
- </p>
- </dd>
- <dt><samp class="option">i_qoffset <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set QP offset between P and I frames.
- </p>
- </dd>
- <dt><samp class="option">dct <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set DCT algorithm.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>autoselect a good one (default)
- </p></dd>
- <dt>‘<samp class="samp">fastint</samp>’</dt>
- <dd><p>fast integer
- </p></dd>
- <dt>‘<samp class="samp">int</samp>’</dt>
- <dd><p>accurate integer
- </p></dd>
- <dt>‘<samp class="samp">mmx</samp>’</dt>
- <dt>‘<samp class="samp">altivec</samp>’</dt>
- <dt>‘<samp class="samp">faan</samp>’</dt>
- <dd><p>floating point AAN DCT
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">lumi_mask <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Compress bright areas stronger than medium ones.
- </p>
- </dd>
- <dt><samp class="option">tcplx_mask <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set temporal complexity masking.
- </p>
- </dd>
- <dt><samp class="option">scplx_mask <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set spatial complexity masking.
- </p>
- </dd>
- <dt><samp class="option">p_mask <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set inter masking.
- </p>
- </dd>
- <dt><samp class="option">dark_mask <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Compress dark areas stronger than medium ones.
- </p>
- </dd>
- <dt><samp class="option">idct <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Select IDCT implementation.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dt>‘<samp class="samp">int</samp>’</dt>
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dt>‘<samp class="samp">simplemmx</samp>’</dt>
- <dt>‘<samp class="samp">simpleauto</samp>’</dt>
- <dd><p>Automatically pick a IDCT compatible with the simple one
- </p>
- </dd>
- <dt>‘<samp class="samp">arm</samp>’</dt>
- <dt>‘<samp class="samp">altivec</samp>’</dt>
- <dt>‘<samp class="samp">sh4</samp>’</dt>
- <dt>‘<samp class="samp">simplearm</samp>’</dt>
- <dt>‘<samp class="samp">simplearmv5te</samp>’</dt>
- <dt>‘<samp class="samp">simplearmv6</samp>’</dt>
- <dt>‘<samp class="samp">simpleneon</samp>’</dt>
- <dt>‘<samp class="samp">xvid</samp>’</dt>
- <dt>‘<samp class="samp">faani</samp>’</dt>
- <dd><p>floating point AAN IDCT
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">slice_count <var class="var">integer</var></samp></dt>
- <dt><samp class="option">ec <var class="var">flags</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd><p>Set error concealment strategy.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">guess_mvs</samp>’</dt>
- <dd><p>iterative motion vector (MV) search (slow)
- </p></dd>
- <dt>‘<samp class="samp">deblock</samp>’</dt>
- <dd><p>use strong deblock filter for damaged MBs
- </p></dd>
- <dt>‘<samp class="samp">favor_inter</samp>’</dt>
- <dd><p>favor predicting from the previous frame instead of the current
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">bits_per_coded_sample <var class="var">integer</var></samp></dt>
- <dt><samp class="option">aspect <var class="var">rational number</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set sample aspect ratio.
- </p>
- </dd>
- <dt><samp class="option">sar <var class="var">rational number</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set sample aspect ratio. Alias to <var class="var">aspect</var>.
- </p>
- </dd>
- <dt><samp class="option">debug <var class="var">flags</var> (<em class="emph">decoding/encoding,audio,video,subtitles</em>)</samp></dt>
- <dd><p>Print specific debug info.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">pict</samp>’</dt>
- <dd><p>picture info
- </p></dd>
- <dt>‘<samp class="samp">rc</samp>’</dt>
- <dd><p>rate control
- </p></dd>
- <dt>‘<samp class="samp">bitstream</samp>’</dt>
- <dt>‘<samp class="samp">mb_type</samp>’</dt>
- <dd><p>macroblock (MB) type
- </p></dd>
- <dt>‘<samp class="samp">qp</samp>’</dt>
- <dd><p>per-block quantization parameter (QP)
- </p></dd>
- <dt>‘<samp class="samp">dct_coeff</samp>’</dt>
- <dt>‘<samp class="samp">green_metadata</samp>’</dt>
- <dd><p>display complexity metadata for the upcoming frame, GoP or for a given duration.
- </p>
- </dd>
- <dt>‘<samp class="samp">skip</samp>’</dt>
- <dt>‘<samp class="samp">startcode</samp>’</dt>
- <dt>‘<samp class="samp">er</samp>’</dt>
- <dd><p>error recognition
- </p></dd>
- <dt>‘<samp class="samp">mmco</samp>’</dt>
- <dd><p>memory management control operations (H.264)
- </p></dd>
- <dt>‘<samp class="samp">bugs</samp>’</dt>
- <dt>‘<samp class="samp">buffers</samp>’</dt>
- <dd><p>picture buffer allocations
- </p></dd>
- <dt>‘<samp class="samp">thread_ops</samp>’</dt>
- <dd><p>threading operations
- </p></dd>
- <dt>‘<samp class="samp">nomc</samp>’</dt>
- <dd><p>skip motion compensation
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">cmp <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set full pel me compare function.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">sad</samp>’</dt>
- <dd><p>sum of absolute differences, fast (default)
- </p></dd>
- <dt>‘<samp class="samp">sse</samp>’</dt>
- <dd><p>sum of squared errors
- </p></dd>
- <dt>‘<samp class="samp">satd</samp>’</dt>
- <dd><p>sum of absolute Hadamard transformed differences
- </p></dd>
- <dt>‘<samp class="samp">dct</samp>’</dt>
- <dd><p>sum of absolute DCT transformed differences
- </p></dd>
- <dt>‘<samp class="samp">psnr</samp>’</dt>
- <dd><p>sum of squared quantization errors (avoid, low quality)
- </p></dd>
- <dt>‘<samp class="samp">bit</samp>’</dt>
- <dd><p>number of bits needed for the block
- </p></dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>rate distortion optimal, slow
- </p></dd>
- <dt>‘<samp class="samp">zero</samp>’</dt>
- <dd><p>0
- </p></dd>
- <dt>‘<samp class="samp">vsad</samp>’</dt>
- <dd><p>sum of absolute vertical differences
- </p></dd>
- <dt>‘<samp class="samp">vsse</samp>’</dt>
- <dd><p>sum of squared vertical differences
- </p></dd>
- <dt>‘<samp class="samp">nsse</samp>’</dt>
- <dd><p>noise preserving sum of squared differences
- </p></dd>
- <dt>‘<samp class="samp">w53</samp>’</dt>
- <dd><p>5/3 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">w97</samp>’</dt>
- <dd><p>9/7 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">dctmax</samp>’</dt>
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">subcmp <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set sub pel me compare function.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">sad</samp>’</dt>
- <dd><p>sum of absolute differences, fast (default)
- </p></dd>
- <dt>‘<samp class="samp">sse</samp>’</dt>
- <dd><p>sum of squared errors
- </p></dd>
- <dt>‘<samp class="samp">satd</samp>’</dt>
- <dd><p>sum of absolute Hadamard transformed differences
- </p></dd>
- <dt>‘<samp class="samp">dct</samp>’</dt>
- <dd><p>sum of absolute DCT transformed differences
- </p></dd>
- <dt>‘<samp class="samp">psnr</samp>’</dt>
- <dd><p>sum of squared quantization errors (avoid, low quality)
- </p></dd>
- <dt>‘<samp class="samp">bit</samp>’</dt>
- <dd><p>number of bits needed for the block
- </p></dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>rate distortion optimal, slow
- </p></dd>
- <dt>‘<samp class="samp">zero</samp>’</dt>
- <dd><p>0
- </p></dd>
- <dt>‘<samp class="samp">vsad</samp>’</dt>
- <dd><p>sum of absolute vertical differences
- </p></dd>
- <dt>‘<samp class="samp">vsse</samp>’</dt>
- <dd><p>sum of squared vertical differences
- </p></dd>
- <dt>‘<samp class="samp">nsse</samp>’</dt>
- <dd><p>noise preserving sum of squared differences
- </p></dd>
- <dt>‘<samp class="samp">w53</samp>’</dt>
- <dd><p>5/3 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">w97</samp>’</dt>
- <dd><p>9/7 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">dctmax</samp>’</dt>
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">mbcmp <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set macroblock compare function.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">sad</samp>’</dt>
- <dd><p>sum of absolute differences, fast (default)
- </p></dd>
- <dt>‘<samp class="samp">sse</samp>’</dt>
- <dd><p>sum of squared errors
- </p></dd>
- <dt>‘<samp class="samp">satd</samp>’</dt>
- <dd><p>sum of absolute Hadamard transformed differences
- </p></dd>
- <dt>‘<samp class="samp">dct</samp>’</dt>
- <dd><p>sum of absolute DCT transformed differences
- </p></dd>
- <dt>‘<samp class="samp">psnr</samp>’</dt>
- <dd><p>sum of squared quantization errors (avoid, low quality)
- </p></dd>
- <dt>‘<samp class="samp">bit</samp>’</dt>
- <dd><p>number of bits needed for the block
- </p></dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>rate distortion optimal, slow
- </p></dd>
- <dt>‘<samp class="samp">zero</samp>’</dt>
- <dd><p>0
- </p></dd>
- <dt>‘<samp class="samp">vsad</samp>’</dt>
- <dd><p>sum of absolute vertical differences
- </p></dd>
- <dt>‘<samp class="samp">vsse</samp>’</dt>
- <dd><p>sum of squared vertical differences
- </p></dd>
- <dt>‘<samp class="samp">nsse</samp>’</dt>
- <dd><p>noise preserving sum of squared differences
- </p></dd>
- <dt>‘<samp class="samp">w53</samp>’</dt>
- <dd><p>5/3 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">w97</samp>’</dt>
- <dd><p>9/7 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">dctmax</samp>’</dt>
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">ildctcmp <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set interlaced dct compare function.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">sad</samp>’</dt>
- <dd><p>sum of absolute differences, fast (default)
- </p></dd>
- <dt>‘<samp class="samp">sse</samp>’</dt>
- <dd><p>sum of squared errors
- </p></dd>
- <dt>‘<samp class="samp">satd</samp>’</dt>
- <dd><p>sum of absolute Hadamard transformed differences
- </p></dd>
- <dt>‘<samp class="samp">dct</samp>’</dt>
- <dd><p>sum of absolute DCT transformed differences
- </p></dd>
- <dt>‘<samp class="samp">psnr</samp>’</dt>
- <dd><p>sum of squared quantization errors (avoid, low quality)
- </p></dd>
- <dt>‘<samp class="samp">bit</samp>’</dt>
- <dd><p>number of bits needed for the block
- </p></dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>rate distortion optimal, slow
- </p></dd>
- <dt>‘<samp class="samp">zero</samp>’</dt>
- <dd><p>0
- </p></dd>
- <dt>‘<samp class="samp">vsad</samp>’</dt>
- <dd><p>sum of absolute vertical differences
- </p></dd>
- <dt>‘<samp class="samp">vsse</samp>’</dt>
- <dd><p>sum of squared vertical differences
- </p></dd>
- <dt>‘<samp class="samp">nsse</samp>’</dt>
- <dd><p>noise preserving sum of squared differences
- </p></dd>
- <dt>‘<samp class="samp">w53</samp>’</dt>
- <dd><p>5/3 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">w97</samp>’</dt>
- <dd><p>9/7 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">dctmax</samp>’</dt>
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">dia_size <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set diamond type & size for motion estimation.
- </p><dl class="table">
- <dt>‘<samp class="samp">(1024, INT_MAX)</samp>’</dt>
- <dd><p>full motion estimation(slowest)
- </p></dd>
- <dt>‘<samp class="samp">(768, 1024]</samp>’</dt>
- <dd><p>umh motion estimation
- </p></dd>
- <dt>‘<samp class="samp">(512, 768]</samp>’</dt>
- <dd><p>hex motion estimation
- </p></dd>
- <dt>‘<samp class="samp">(256, 512]</samp>’</dt>
- <dd><p>l2s diamond motion estimation
- </p></dd>
- <dt>‘<samp class="samp">[2,256]</samp>’</dt>
- <dd><p>var diamond motion estimation
- </p></dd>
- <dt>‘<samp class="samp">(-1, 2)</samp>’</dt>
- <dd><p>small diamond motion estimation
- </p></dd>
- <dt>‘<samp class="samp">-1</samp>’</dt>
- <dd><p>funny diamond motion estimation
- </p></dd>
- <dt>‘<samp class="samp">(INT_MIN, -1)</samp>’</dt>
- <dd><p>sab diamond motion estimation
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">last_pred <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set amount of motion predictors from the previous frame.
- </p>
- </dd>
- <dt><samp class="option">precmp <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set pre motion estimation compare function.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">sad</samp>’</dt>
- <dd><p>sum of absolute differences, fast (default)
- </p></dd>
- <dt>‘<samp class="samp">sse</samp>’</dt>
- <dd><p>sum of squared errors
- </p></dd>
- <dt>‘<samp class="samp">satd</samp>’</dt>
- <dd><p>sum of absolute Hadamard transformed differences
- </p></dd>
- <dt>‘<samp class="samp">dct</samp>’</dt>
- <dd><p>sum of absolute DCT transformed differences
- </p></dd>
- <dt>‘<samp class="samp">psnr</samp>’</dt>
- <dd><p>sum of squared quantization errors (avoid, low quality)
- </p></dd>
- <dt>‘<samp class="samp">bit</samp>’</dt>
- <dd><p>number of bits needed for the block
- </p></dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>rate distortion optimal, slow
- </p></dd>
- <dt>‘<samp class="samp">zero</samp>’</dt>
- <dd><p>0
- </p></dd>
- <dt>‘<samp class="samp">vsad</samp>’</dt>
- <dd><p>sum of absolute vertical differences
- </p></dd>
- <dt>‘<samp class="samp">vsse</samp>’</dt>
- <dd><p>sum of squared vertical differences
- </p></dd>
- <dt>‘<samp class="samp">nsse</samp>’</dt>
- <dd><p>noise preserving sum of squared differences
- </p></dd>
- <dt>‘<samp class="samp">w53</samp>’</dt>
- <dd><p>5/3 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">w97</samp>’</dt>
- <dd><p>9/7 wavelet, only used in snow
- </p></dd>
- <dt>‘<samp class="samp">dctmax</samp>’</dt>
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">pre_dia_size <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set diamond type & size for motion estimation pre-pass.
- </p>
- </dd>
- <dt><samp class="option">subq <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set sub pel motion estimation quality.
- </p>
- </dd>
- <dt><samp class="option">me_range <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set limit motion vectors range (1023 for DivX player).
- </p>
- </dd>
- <dt><samp class="option">global_quality <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dt><samp class="option">slice_flags <var class="var">integer</var></samp></dt>
- <dt><samp class="option">mbd <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set macroblock decision algorithm (high quality mode).
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dd><p>use mbcmp (default)
- </p></dd>
- <dt>‘<samp class="samp">bits</samp>’</dt>
- <dd><p>use fewest bits
- </p></dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>use best rate distortion
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">rc_init_occupancy <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set number of bits which should be loaded into the rc buffer before
- decoding starts.
- </p>
- </dd>
- <dt><samp class="option">flags2 <var class="var">flags</var> (<em class="emph">decoding/encoding,audio,video,subtitles</em>)</samp></dt>
- <dd>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">fast</samp>’</dt>
- <dd><p>Allow non spec compliant speedup tricks.
- </p></dd>
- <dt>‘<samp class="samp">noout</samp>’</dt>
- <dd><p>Skip bitstream encoding.
- </p></dd>
- <dt>‘<samp class="samp">ignorecrop</samp>’</dt>
- <dd><p>Ignore cropping information from sps.
- </p></dd>
- <dt>‘<samp class="samp">local_header</samp>’</dt>
- <dd><p>Place global headers at every keyframe instead of in extradata.
- </p></dd>
- <dt>‘<samp class="samp">chunks</samp>’</dt>
- <dd><p>Frame data might be split into multiple chunks.
- </p></dd>
- <dt>‘<samp class="samp">showall</samp>’</dt>
- <dd><p>Show all frames before the first keyframe.
- </p></dd>
- <dt>‘<samp class="samp">export_mvs</samp>’</dt>
- <dd><p>Export motion vectors into frame side-data (see <code class="code">AV_FRAME_DATA_MOTION_VECTORS</code>)
- for codecs that support it. See also <samp class="file">doc/examples/export_mvs.c</samp>.
- </p></dd>
- <dt>‘<samp class="samp">skip_manual</samp>’</dt>
- <dd><p>Do not skip samples and export skip information as frame side data.
- </p></dd>
- <dt>‘<samp class="samp">ass_ro_flush_noop</samp>’</dt>
- <dd><p>Do not reset ASS ReadOrder field on flush.
- </p></dd>
- <dt>‘<samp class="samp">icc_profiles</samp>’</dt>
- <dd><p>Generate/parse embedded ICC profiles from/to colorimetry tags.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">export_side_data <var class="var">flags</var> (<em class="emph">decoding/encoding,audio,video,subtitles</em>)</samp></dt>
- <dd>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">mvs</samp>’</dt>
- <dd><p>Export motion vectors into frame side-data (see <code class="code">AV_FRAME_DATA_MOTION_VECTORS</code>)
- for codecs that support it. See also <samp class="file">doc/examples/export_mvs.c</samp>.
- </p></dd>
- <dt>‘<samp class="samp">prft</samp>’</dt>
- <dd><p>Export encoder Producer Reference Time into packet side-data (see <code class="code">AV_PKT_DATA_PRFT</code>)
- for codecs that support it.
- </p></dd>
- <dt>‘<samp class="samp">venc_params</samp>’</dt>
- <dd><p>Export video encoding parameters through frame side data (see <code class="code">AV_FRAME_DATA_VIDEO_ENC_PARAMS</code>)
- for codecs that support it. At present, those are H.264 and VP9.
- </p></dd>
- <dt>‘<samp class="samp">film_grain</samp>’</dt>
- <dd><p>Export film grain parameters through frame side data (see <code class="code">AV_FRAME_DATA_FILM_GRAIN_PARAMS</code>).
- Supported at present by AV1 decoders.
- </p></dd>
- <dt>‘<samp class="samp">enhancements</samp>’</dt>
- <dd><p>Export picture enhancement metadata through frame side data, e.g. LCEVC (see <code class="code">AV_FRAME_DATA_LCEVC</code>).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">threads <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Set the number of threads to be used, in case the selected codec
- implementation supports multi-threading.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto, 0</samp>’</dt>
- <dd><p>automatically select the number of threads to set
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">auto</samp>’.
- </p>
- </dd>
- <dt><samp class="option">dc <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set intra_dc_precision.
- </p>
- </dd>
- <dt><samp class="option">nssew <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set nsse weight.
- </p>
- </dd>
- <dt><samp class="option">skip_top <var class="var">integer</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd><p>Set number of macroblock rows at the top which are skipped.
- </p>
- </dd>
- <dt><samp class="option">skip_bottom <var class="var">integer</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd><p>Set number of macroblock rows at the bottom which are skipped.
- </p>
- </dd>
- <dt><samp class="option">profile <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd>
- <p>Set encoder codec profile. Default value is ‘<samp class="samp">unknown</samp>’. Encoder specific
- profiles are documented in the relevant encoder documentation.
- </p>
- </dd>
- <dt><samp class="option">level <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd>
- <p>Set the encoder level. This level depends on the specific codec, and
- might correspond to the profile level. It is set by default to
- ‘<samp class="samp">unknown</samp>’.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">lowres <var class="var">integer</var> (<em class="emph">decoding,audio,video</em>)</samp></dt>
- <dd><p>Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions.
- </p>
- </dd>
- <dt><samp class="option">mblmin <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set min macroblock lagrange factor (VBR).
- </p>
- </dd>
- <dt><samp class="option">mblmax <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set max macroblock lagrange factor (VBR).
- </p>
- </dd>
- <dt><samp class="option">skip_loop_filter <var class="var">integer</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dt><samp class="option">skip_idct <var class="var">integer</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dt><samp class="option">skip_frame <var class="var">integer</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd>
- <p>Make decoder discard processing depending on the frame type selected
- by the option value.
- </p>
- <p><samp class="option">skip_loop_filter</samp> skips frame loop filtering, <samp class="option">skip_idct</samp>
- skips frame IDCT/dequantization, <samp class="option">skip_frame</samp> skips decoding.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Discard no frame.
- </p>
- </dd>
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>Discard useless frames like 0-sized frames.
- </p>
- </dd>
- <dt>‘<samp class="samp">noref</samp>’</dt>
- <dd><p>Discard all non-reference frames.
- </p>
- </dd>
- <dt>‘<samp class="samp">bidir</samp>’</dt>
- <dd><p>Discard all bidirectional frames.
- </p>
- </dd>
- <dt>‘<samp class="samp">nokey</samp>’</dt>
- <dd><p>Discard all frames excepts keyframes.
- </p>
- </dd>
- <dt>‘<samp class="samp">nointra</samp>’</dt>
- <dd><p>Discard all frames except I frames.
- </p>
- </dd>
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>Discard all frames.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">default</samp>’.
- </p>
- </dd>
- <dt><samp class="option">bidir_refine <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Refine the two motion vectors used in bidirectional macroblocks.
- </p>
- </dd>
- <dt><samp class="option">keyint_min <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set minimum interval between IDR-frames.
- </p>
- </dd>
- <dt><samp class="option">refs <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Set reference frames to consider for motion compensation.
- </p>
- </dd>
- <dt><samp class="option">trellis <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dd><p>Set rate-distortion optimal quantization.
- </p>
- </dd>
- <dt><samp class="option">mv0_threshold <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dt><samp class="option">compression_level <var class="var">integer</var> (<em class="emph">encoding,audio,video</em>)</samp></dt>
- <dt><samp class="option">bits_per_raw_sample <var class="var">integer</var></samp></dt>
- <dt><samp class="option">channel_layout <var class="var">integer</var> (<em class="emph">decoding/encoding,audio</em>)</samp></dt>
- <dd><p>See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#channel-layout-syntax">the Channel Layout section in the ffmpeg-utils(1) manual</a>
- for the required syntax.
- </p>
- </dd>
- <dt><samp class="option">rc_max_vbv_use <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dt><samp class="option">rc_min_vbv_use <var class="var">float</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dt><samp class="option">color_primaries <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p></dd>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dd><p>BT.470 M
- </p></dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470 BG
- </p></dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE 170 M
- </p></dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE 240 M
- </p></dd>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dd><p>Film
- </p></dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>BT.2020
- </p></dd>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dt>‘<samp class="samp">smpte428_1</samp>’</dt>
- <dd><p>SMPTE ST 428-1
- </p></dd>
- <dt>‘<samp class="samp">smpte431</samp>’</dt>
- <dd><p>SMPTE 431-2
- </p></dd>
- <dt>‘<samp class="samp">smpte432</samp>’</dt>
- <dd><p>SMPTE 432-1
- </p></dd>
- <dt>‘<samp class="samp">jedec-p22</samp>’</dt>
- <dd><p>JEDEC P22
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">color_trc <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p></dd>
- <dt>‘<samp class="samp">gamma22</samp>’</dt>
- <dd><p>BT.470 M
- </p></dd>
- <dt>‘<samp class="samp">gamma28</samp>’</dt>
- <dd><p>BT.470 BG
- </p></dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE 170 M
- </p></dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE 240 M
- </p></dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Linear
- </p></dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dt>‘<samp class="samp">log100</samp>’</dt>
- <dd><p>Log
- </p></dd>
- <dt>‘<samp class="samp">log_sqrt</samp>’</dt>
- <dt>‘<samp class="samp">log316</samp>’</dt>
- <dd><p>Log square root
- </p></dd>
- <dt>‘<samp class="samp">iec61966_2_4</samp>’</dt>
- <dt>‘<samp class="samp">iec61966-2-4</samp>’</dt>
- <dd><p>IEC 61966-2-4
- </p></dd>
- <dt>‘<samp class="samp">bt1361</samp>’</dt>
- <dt>‘<samp class="samp">bt1361e</samp>’</dt>
- <dd><p>BT.1361
- </p></dd>
- <dt>‘<samp class="samp">iec61966_2_1</samp>’</dt>
- <dt>‘<samp class="samp">iec61966-2-1</samp>’</dt>
- <dd><p>IEC 61966-2-1
- </p></dd>
- <dt>‘<samp class="samp">bt2020_10</samp>’</dt>
- <dt>‘<samp class="samp">bt2020_10bit</samp>’</dt>
- <dd><p>BT.2020 - 10 bit
- </p></dd>
- <dt>‘<samp class="samp">bt2020_12</samp>’</dt>
- <dt>‘<samp class="samp">bt2020_12bit</samp>’</dt>
- <dd><p>BT.2020 - 12 bit
- </p></dd>
- <dt>‘<samp class="samp">smpte2084</samp>’</dt>
- <dd><p>SMPTE ST 2084
- </p></dd>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dt>‘<samp class="samp">smpte428_1</samp>’</dt>
- <dd><p>SMPTE ST 428-1
- </p></dd>
- <dt>‘<samp class="samp">arib-std-b67</samp>’</dt>
- <dd><p>ARIB STD-B67
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">colorspace <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rgb</samp>’</dt>
- <dd><p>RGB
- </p></dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p></dd>
- <dt>‘<samp class="samp">fcc</samp>’</dt>
- <dd><p>FCC
- </p></dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470 BG
- </p></dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE 170 M
- </p></dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE 240 M
- </p></dd>
- <dt>‘<samp class="samp">ycocg</samp>’</dt>
- <dd><p>YCOCG
- </p></dd>
- <dt>‘<samp class="samp">bt2020nc</samp>’</dt>
- <dt>‘<samp class="samp">bt2020_ncl</samp>’</dt>
- <dd><p>BT.2020 NCL
- </p></dd>
- <dt>‘<samp class="samp">bt2020c</samp>’</dt>
- <dt>‘<samp class="samp">bt2020_cl</samp>’</dt>
- <dd><p>BT.2020 CL
- </p></dd>
- <dt>‘<samp class="samp">smpte2085</samp>’</dt>
- <dd><p>SMPTE 2085
- </p></dd>
- <dt>‘<samp class="samp">chroma-derived-nc</samp>’</dt>
- <dd><p>Chroma-derived NCL
- </p></dd>
- <dt>‘<samp class="samp">chroma-derived-c</samp>’</dt>
- <dd><p>Chroma-derived CL
- </p></dd>
- <dt>‘<samp class="samp">ictcp</samp>’</dt>
- <dd><p>ICtCp
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">color_range <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>If used as input parameter, it serves as a hint to the decoder, which
- color_range the input has.
- Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">tv</samp>’</dt>
- <dt>‘<samp class="samp">mpeg</samp>’</dt>
- <dt>‘<samp class="samp">limited</samp>’</dt>
- <dd><p>MPEG (219*2^(n-8))
- </p></dd>
- <dt>‘<samp class="samp">pc</samp>’</dt>
- <dt>‘<samp class="samp">jpeg</samp>’</dt>
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>JPEG (2^n-1)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">chroma_sample_location <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">left</samp>’</dt>
- <dt>‘<samp class="samp">center</samp>’</dt>
- <dt>‘<samp class="samp">topleft</samp>’</dt>
- <dt>‘<samp class="samp">top</samp>’</dt>
- <dt>‘<samp class="samp">bottomleft</samp>’</dt>
- <dt>‘<samp class="samp">bottom</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">alpha_mode <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">premultiplied</samp>’</dt>
- <dt>‘<samp class="samp">straight</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">log_level_offset <var class="var">integer</var></samp></dt>
- <dd><p>Set the log level offset.
- </p>
- </dd>
- <dt><samp class="option">slices <var class="var">integer</var> (<em class="emph">encoding,video</em>)</samp></dt>
- <dd><p>Number of slices, used in parallelized encoding.
- </p>
- </dd>
- <dt><samp class="option">thread_type <var class="var">flags</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Select which multithreading methods to use.
- </p>
- <p>Use of ‘<samp class="samp">frame</samp>’ will increase decoding delay by one frame per
- thread, so clients which cannot provide future frames should not use
- it.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">slice</samp>’</dt>
- <dd><p>Decode more than one part of a single frame at once.
- </p>
- <p>Multithreading using slices works only when the video was encoded with
- slices.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Decode more than one frame at once.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">slice+frame</samp>’.
- </p>
- </dd>
- <dt><samp class="option">audio_service_type <var class="var">integer</var> (<em class="emph">encoding,audio</em>)</samp></dt>
- <dd><p>Set audio service type.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">ma</samp>’</dt>
- <dd><p>Main Audio Service
- </p></dd>
- <dt>‘<samp class="samp">ef</samp>’</dt>
- <dd><p>Effects
- </p></dd>
- <dt>‘<samp class="samp">vi</samp>’</dt>
- <dd><p>Visually Impaired
- </p></dd>
- <dt>‘<samp class="samp">hi</samp>’</dt>
- <dd><p>Hearing Impaired
- </p></dd>
- <dt>‘<samp class="samp">di</samp>’</dt>
- <dd><p>Dialogue
- </p></dd>
- <dt>‘<samp class="samp">co</samp>’</dt>
- <dd><p>Commentary
- </p></dd>
- <dt>‘<samp class="samp">em</samp>’</dt>
- <dd><p>Emergency
- </p></dd>
- <dt>‘<samp class="samp">vo</samp>’</dt>
- <dd><p>Voice Over
- </p></dd>
- <dt>‘<samp class="samp">ka</samp>’</dt>
- <dd><p>Karaoke
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">request_sample_fmt <var class="var">sample_fmt</var> (<em class="emph">decoding,audio</em>)</samp></dt>
- <dd><p>Set sample format audio decoders should prefer. Default value is
- <code class="code">none</code>.
- </p>
- </dd>
- <dt><samp class="option">pkt_timebase <var class="var">rational number</var></samp></dt>
- <dt><samp class="option">sub_charenc <var class="var">encoding</var> (<em class="emph">decoding,subtitles</em>)</samp></dt>
- <dd><p>Set the input subtitles character encoding.
- </p>
- </dd>
- <dt><samp class="option">field_order <var class="var">field_order</var> (<em class="emph">video</em>)</samp></dt>
- <dd><p>Set/override the field order of the video.
- Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">progressive</samp>’</dt>
- <dd><p>Progressive video
- </p></dd>
- <dt>‘<samp class="samp">tt</samp>’</dt>
- <dd><p>Interlaced video, top field coded and displayed first
- </p></dd>
- <dt>‘<samp class="samp">bb</samp>’</dt>
- <dd><p>Interlaced video, bottom field coded and displayed first
- </p></dd>
- <dt>‘<samp class="samp">tb</samp>’</dt>
- <dd><p>Interlaced video, top coded first, bottom displayed first
- </p></dd>
- <dt>‘<samp class="samp">bt</samp>’</dt>
- <dd><p>Interlaced video, bottom coded first, top displayed first
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">skip_alpha <var class="var">bool</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd><p>Set to 1 to disable processing alpha (transparency). This works like the
- ‘<samp class="samp">gray</samp>’ flag in the <samp class="option">flags</samp> option which skips chroma information
- instead of alpha. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">codec_whitelist <var class="var">list</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>"," separated list of allowed decoders. By default all are allowed.
- </p>
- </dd>
- <dt><samp class="option">dump_separator <var class="var">string</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Separator used to separate the fields printed on the command line about the
- Stream parameters.
- For example, to separate the fields with newlines and indentation:
- </p><div class="example">
- <pre class="example-preformatted">ffprobe -dump_separator "
- " -i ~/videos/matrixbench_mpeg2.mpg
- </pre></div>
- </dd>
- <dt><samp class="option">max_pixels <var class="var">integer</var> (<em class="emph">decoding/encoding,video</em>)</samp></dt>
- <dd><p>Maximum number of pixels per image. This value can be used to avoid out of
- memory failures due to large images.
- </p>
- </dd>
- <dt><samp class="option">apply_cropping <var class="var">bool</var> (<em class="emph">decoding,video</em>)</samp></dt>
- <dd><p>Enable cropping if cropping parameters are multiples of the required
- alignment for the left and top parameters. If the alignment is not met the
- cropping will be partially applied to maintain alignment.
- Default is 1 (enabled).
- Note: The required alignment depends on if <code class="code">AV_CODEC_FLAG_UNALIGNED</code> is set and the
- CPU. <code class="code">AV_CODEC_FLAG_UNALIGNED</code> cannot be changed from the command line. Also hardware
- decoders will not apply left/top Cropping.
- </p>
- </dd>
- </dl>
- <a name="Decoders"></a>
- <h2 class="chapter">10 Decoders<span class="pull-right"><a class="anchor hidden-xs" href="#Decoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Decoders" aria-hidden="true">TOC</a></span></h2>
- <p>Decoders are configured elements in FFmpeg which allow the decoding of
- multimedia streams.
- </p>
- <p>When you configure your FFmpeg build, all the supported native decoders
- are enabled by default. Decoders requiring an external library must be enabled
- manually via the corresponding <code class="code">--enable-lib</code> option. You can list all
- available decoders using the configure option <code class="code">--list-decoders</code>.
- </p>
- <p>You can disable all the decoders with the configure option
- <code class="code">--disable-decoders</code> and selectively enable / disable single decoders
- with the options <code class="code">--enable-decoder=<var class="var">DECODER</var></code> /
- <code class="code">--disable-decoder=<var class="var">DECODER</var></code>.
- </p>
- <p>The option <code class="code">-decoders</code> of the ff* tools will display the list of
- enabled decoders.
- </p>
- <a name="Video-Decoders"></a>
- <h2 class="chapter">11 Video Decoders<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Decoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Decoders" aria-hidden="true">TOC</a></span></h2>
- <p>A description of some of the currently available video decoders
- follows.
- </p>
- <a name="av1"></a>
- <h3 class="section">11.1 av1<span class="pull-right"><a class="anchor hidden-xs" href="#av1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-av1" aria-hidden="true">TOC</a></span></h3>
- <p>AOMedia Video 1 (AV1) decoder.
- </p>
- <a name="Options-1"></a>
- <h4 class="subsection">11.1.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-1" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">operating_point</samp></dt>
- <dd><p>Select an operating point of a scalable AV1 bitstream (0 - 31). Default is 0.
- </p>
- </dd>
- </dl>
- <a name="hevc"></a>
- <h3 class="section">11.2 hevc<span class="pull-right"><a class="anchor hidden-xs" href="#hevc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hevc" aria-hidden="true">TOC</a></span></h3>
- <p>HEVC (AKA ITU-T H.265 or ISO/IEC 23008-2) decoder.
- </p>
- <p>The decoder supports MV-HEVC multiview streams with at most two views. Views to
- be output are selected by supplying a list of view IDs to the decoder (the
- <samp class="option">view_ids</samp> option). This option may be set either statically before
- decoder init, or from the <code class="code">get_format()</code> callback - useful for the case
- when the view count or IDs change dynamically during decoding.
- </p>
- <p>Only the base layer is decoded by default.
- </p>
- <p>Note that if you are using the <code class="code">ffmpeg</code> CLI tool, you should be using view
- specifiers as documented in its manual, rather than the options documented here.
- </p>
- <a name="Options-2"></a>
- <h4 class="subsection">11.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-2" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">view_ids (MV-HEVC)</samp></dt>
- <dd><p>Specify a list of view IDs that should be output. This option can also be set to
- a single ’-1’, which will cause all views defined in the VPS to be decoded and
- output.
- </p>
- </dd>
- <dt><samp class="option">view_ids_available (MV-HEVC)</samp></dt>
- <dd><p>This option may be read by the caller to retrieve an array of view IDs available
- in the active VPS. The array is empty for single-layer video.
- </p>
- <p>The value of this option is guaranteed to be accurate when read from the
- <code class="code">get_format()</code> callback. It may also be set at other times (e.g. after
- opening the decoder), but the value is informational only and may be incorrect
- (e.g. when the stream contains multiple distinct VPS NALUs).
- </p>
- </dd>
- <dt><samp class="option">view_pos_available (MV-HEVC)</samp></dt>
- <dd><p>This option may be read by the caller to retrieve an array of view positions
- (left, right, or unspecified) available in the active VPS, as
- <code class="code">AVStereo3DView</code> values. When the array is available, its elements apply to
- the corresponding elements of <samp class="option">view_ids_available</samp>, i.e.
- <code class="code">view_pos_available[i]</code> contains the position of view with ID
- <code class="code">view_ids_available[i]</code>.
- </p>
- <p>Same validity restrictions as for <samp class="option">view_ids_available</samp> apply to
- this option.
- </p>
- </dd>
- </dl>
- <a name="rawvideo"></a>
- <h3 class="section">11.3 rawvideo<span class="pull-right"><a class="anchor hidden-xs" href="#rawvideo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rawvideo" aria-hidden="true">TOC</a></span></h3>
- <p>Raw video decoder.
- </p>
- <p>This decoder decodes rawvideo streams.
- </p>
- <a name="Options-3"></a>
- <h4 class="subsection">11.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-3" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">top <var class="var">top_field_first</var></samp></dt>
- <dd><p>Specify the assumed field type of the input video.
- </p><dl class="table">
- <dt><samp class="option">-1</samp></dt>
- <dd><p>the video is assumed to be progressive (default)
- </p></dd>
- <dt><samp class="option">0</samp></dt>
- <dd><p>bottom-field-first is assumed
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dd><p>top-field-first is assumed
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="libdav1d"></a>
- <h3 class="section">11.4 libdav1d<span class="pull-right"><a class="anchor hidden-xs" href="#libdav1d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libdav1d" aria-hidden="true">TOC</a></span></h3>
- <p>dav1d AV1 decoder.
- </p>
- <p>libdav1d allows libavcodec to decode the AOMedia Video 1 (AV1) codec.
- Requires the presence of the libdav1d headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libdav1d</code>.
- </p>
- <a name="Options-4"></a>
- <h4 class="subsection">11.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-4" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libdav1d wrapper.
- </p>
- <dl class="table">
- <dt><samp class="option">max_frame_delay</samp></dt>
- <dd><p>Set max amount of frames the decoder may buffer internally. The default value is 0
- (autodetect).
- </p>
- </dd>
- <dt><samp class="option">filmgrain</samp></dt>
- <dd><p>Apply film grain to the decoded video if present in the bitstream. Defaults to the
- internal default of the library.
- This option is deprecated and will be removed in the future. See the global option
- <code class="code">export_side_data</code> to export Film Grain parameters instead of applying it.
- </p>
- </dd>
- <dt><samp class="option">oppoint</samp></dt>
- <dd><p>Select an operating point of a scalable AV1 bitstream (0 - 31). Defaults to the
- internal default of the library.
- </p>
- </dd>
- <dt><samp class="option">alllayers</samp></dt>
- <dd><p>Output all spatial layers of a scalable AV1 bitstream. The default value is false.
- </p>
- </dd>
- </dl>
- <a name="libdavs2"></a>
- <h3 class="section">11.5 libdavs2<span class="pull-right"><a class="anchor hidden-xs" href="#libdavs2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libdavs2" aria-hidden="true">TOC</a></span></h3>
- <p>AVS2-P2/IEEE1857.4 video decoder wrapper.
- </p>
- <p>This decoder allows libavcodec to decode AVS2 streams with davs2 library.
- </p>
- <a name="libuavs3d"></a>
- <h3 class="section">11.6 libuavs3d<span class="pull-right"><a class="anchor hidden-xs" href="#libuavs3d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libuavs3d" aria-hidden="true">TOC</a></span></h3>
- <p>AVS3-P2/IEEE1857.10 video decoder.
- </p>
- <p>libuavs3d allows libavcodec to decode AVS3 streams.
- Requires the presence of the libuavs3d headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libuavs3d</code>.
- </p>
- <a name="Options-5"></a>
- <h4 class="subsection">11.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-5" aria-hidden="true">TOC</a></span></h4>
- <p>The following option is supported by the libuavs3d wrapper.
- </p>
- <dl class="table">
- <dt><samp class="option">frame_threads</samp></dt>
- <dd><p>Set amount of frame threads to use during decoding. The default value is 0 (autodetect).
- </p>
- </dd>
- </dl>
- <a name="libxevd"></a>
- <h3 class="section">11.7 libxevd<span class="pull-right"><a class="anchor hidden-xs" href="#libxevd" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libxevd" aria-hidden="true">TOC</a></span></h3>
- <p>eXtra-fast Essential Video Decoder (XEVD) MPEG-5 EVC decoder wrapper.
- </p>
- <p>This decoder requires the presence of the libxevd headers and library
- during configuration. You need to explicitly configure the build with
- <samp class="option">--enable-libxevd</samp>.
- </p>
- <p>The xevd project website is at <a class="url" href="https://github.com/mpeg5/xevd">https://github.com/mpeg5/xevd</a>.
- </p>
- <a name="Options-6"></a>
- <h4 class="subsection">11.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-6" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-6" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libxevd wrapper.
- The xevd-equivalent options or values are listed in parentheses for easy migration.
- </p>
- <p>To get a more accurate and extensive documentation of the libxevd options,
- invoke the command <code class="code">xevd_app --help</code> or consult the libxevd documentation.
- </p>
- <dl class="table">
- <dt><samp class="option">threads (<em class="emph">threads</em>)</samp></dt>
- <dd><p>Force to use a specific number of threads
- </p>
- </dd>
- </dl>
- <a name="QSV-Decoders"></a>
- <h3 class="section">11.8 QSV Decoders<span class="pull-right"><a class="anchor hidden-xs" href="#QSV-Decoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-QSV-Decoders" aria-hidden="true">TOC</a></span></h3>
- <p>The family of Intel QuickSync Video decoders (VC1, MPEG-2, H.264, HEVC,
- JPEG/MJPEG, VP8, VP9, AV1, VVC).
- </p>
- <a name="Common-Options"></a>
- <h4 class="subsection">11.8.1 Common Options<span class="pull-right"><a class="anchor hidden-xs" href="#Common-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Common-Options" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by all qsv decoders.
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">async_depth</var></samp></dt>
- <dd><p>Internal parallelization depth, the higher the value the higher the latency.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">gpu_copy</var></samp></dt>
- <dd><p>A GPU-accelerated copy between video and system memory
- </p><dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dt>‘<samp class="samp">on</samp>’</dt>
- <dt>‘<samp class="samp">off</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="HEVC-Options"></a>
- <h4 class="subsection">11.8.2 HEVC Options<span class="pull-right"><a class="anchor hidden-xs" href="#HEVC-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-HEVC-Options" aria-hidden="true">TOC</a></span></h4>
- <p>Extra options for hevc_qsv.
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">load_plugin</var></samp></dt>
- <dd><p>A user plugin to load in an internal session
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dt>‘<samp class="samp">hevc_sw</samp>’</dt>
- <dt>‘<samp class="samp">hevc_hw</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">load_plugins</var></samp></dt>
- <dd><p>A :-separate list of hexadecimal plugin UIDs to load in an internal session
- </p>
- </dd>
- </dl>
- <a name="v210"></a>
- <h3 class="section">11.9 v210<span class="pull-right"><a class="anchor hidden-xs" href="#v210" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-v210" aria-hidden="true">TOC</a></span></h3>
- <p>Uncompressed 4:2:2 10-bit decoder.
- </p>
- <a name="Options-7"></a>
- <h4 class="subsection">11.9.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-7" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">custom_stride</samp></dt>
- <dd><p>Set the line size of the v210 data in bytes. The default value is 0
- (autodetect). You can use the special -1 value for a strideless v210 as seen in
- BOXX files.
- </p>
- </dd>
- </dl>
- <a name="Audio-Decoders"></a>
- <h2 class="chapter">12 Audio Decoders<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Decoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Decoders" aria-hidden="true">TOC</a></span></h2>
- <p>A description of some of the currently available audio decoders
- follows.
- </p>
- <a name="ac3"></a>
- <h3 class="section">12.1 ac3<span class="pull-right"><a class="anchor hidden-xs" href="#ac3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ac3" aria-hidden="true">TOC</a></span></h3>
- <p>AC-3 audio decoder.
- </p>
- <p>This decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as well as
- the undocumented RealAudio 3 (a.k.a. dnet).
- </p>
- <a name="AC_002d3-Decoder-Options"></a>
- <h4 class="subsection">12.1.1 AC-3 Decoder Options<span class="pull-right"><a class="anchor hidden-xs" href="#AC_002d3-Decoder-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AC_002d3-Decoder-Options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-drc_scale <var class="var">value</var></samp></dt>
- <dd><p>Dynamic Range Scale Factor. The factor to apply to dynamic range values
- from the AC-3 stream. This factor is applied exponentially. The default value is 1.
- There are 3 notable scale factor ranges:
- </p><dl class="table">
- <dt><samp class="option">drc_scale == 0</samp></dt>
- <dd><p>DRC disabled. Produces full range audio.
- </p></dd>
- <dt><samp class="option">0 < drc_scale <= 1</samp></dt>
- <dd><p>DRC enabled. Applies a fraction of the stream DRC value.
- Audio reproduction is between full range and full compression.
- </p></dd>
- <dt><samp class="option">drc_scale > 1</samp></dt>
- <dd><p>DRC enabled. Applies drc_scale asymmetrically.
- Loud sounds are fully compressed. Soft sounds are enhanced.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="flac-1"></a>
- <h3 class="section">12.2 flac<span class="pull-right"><a class="anchor hidden-xs" href="#flac-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flac-1" aria-hidden="true">TOC</a></span></h3>
- <p>FLAC audio decoder.
- </p>
- <p>This decoder aims to implement the complete FLAC specification from Xiph.
- </p>
- <a name="FLAC-Decoder-options"></a>
- <h4 class="subsection">12.2.1 FLAC Decoder options<span class="pull-right"><a class="anchor hidden-xs" href="#FLAC-Decoder-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-FLAC-Decoder-options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-use_buggy_lpc</samp></dt>
- <dd><p>The lavc FLAC encoder used to produce buggy streams with high lpc values
- (like the default value). This option makes it possible to decode such streams
- correctly by using lavc’s old buggy lpc logic for decoding.
- </p>
- </dd>
- </dl>
- <a name="ffwavesynth"></a>
- <h3 class="section">12.3 ffwavesynth<span class="pull-right"><a class="anchor hidden-xs" href="#ffwavesynth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ffwavesynth" aria-hidden="true">TOC</a></span></h3>
- <p>Internal wave synthesizer.
- </p>
- <p>This decoder generates wave patterns according to predefined sequences. Its
- use is purely internal and the format of the data it accepts is not publicly
- documented.
- </p>
- <a name="libcelt"></a>
- <h3 class="section">12.4 libcelt<span class="pull-right"><a class="anchor hidden-xs" href="#libcelt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libcelt" aria-hidden="true">TOC</a></span></h3>
- <p>libcelt decoder wrapper.
- </p>
- <p>libcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio codec.
- Requires the presence of the libcelt headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libcelt</code>.
- </p>
- <a name="libgsm"></a>
- <h3 class="section">12.5 libgsm<span class="pull-right"><a class="anchor hidden-xs" href="#libgsm" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libgsm" aria-hidden="true">TOC</a></span></h3>
- <p>libgsm decoder wrapper.
- </p>
- <p>libgsm allows libavcodec to decode the GSM full rate audio codec. Requires
- the presence of the libgsm headers and library during configuration. You need
- to explicitly configure the build with <code class="code">--enable-libgsm</code>.
- </p>
- <p>This decoder supports both the ordinary GSM and the Microsoft variant.
- </p>
- <a name="libilbc"></a>
- <h3 class="section">12.6 libilbc<span class="pull-right"><a class="anchor hidden-xs" href="#libilbc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libilbc" aria-hidden="true">TOC</a></span></h3>
- <p>libilbc decoder wrapper.
- </p>
- <p>libilbc allows libavcodec to decode the Internet Low Bitrate Codec (iLBC)
- audio codec. Requires the presence of the libilbc headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libilbc</code>.
- </p>
- <a name="Options-8"></a>
- <h4 class="subsection">12.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-8" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-8" aria-hidden="true">TOC</a></span></h4>
- <p>The following option is supported by the libilbc wrapper.
- </p>
- <dl class="table">
- <dt><samp class="option">enhance</samp></dt>
- <dd>
- <p>Enable the enhancement of the decoded audio when set to 1. The default
- value is 0 (disabled).
- </p>
- </dd>
- </dl>
- <a name="libmpeghdec"></a>
- <h3 class="section">12.7 libmpeghdec<span class="pull-right"><a class="anchor hidden-xs" href="#libmpeghdec" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libmpeghdec" aria-hidden="true">TOC</a></span></h3>
- <p>libmpeghdec decoder wrapper.
- </p>
- <p>libmpeghdec allows libmpeghdec to decode the MPEG-H 3D audio codec.
- Requires the presence of the libmpeghdec headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libmpeghdec --enable-nonfree</code>.
- </p>
- <a name="libopencore_002damrnb"></a>
- <h3 class="section">12.8 libopencore-amrnb<span class="pull-right"><a class="anchor hidden-xs" href="#libopencore_002damrnb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopencore_002damrnb" aria-hidden="true">TOC</a></span></h3>
- <p>libopencore-amrnb decoder wrapper.
- </p>
- <p>libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate
- Narrowband audio codec. Using it requires the presence of the
- libopencore-amrnb headers and library during configuration. You need to
- explicitly configure the build with <code class="code">--enable-libopencore-amrnb</code>.
- </p>
- <p>An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB
- without this library.
- </p>
- <a name="libopencore_002damrwb"></a>
- <h3 class="section">12.9 libopencore-amrwb<span class="pull-right"><a class="anchor hidden-xs" href="#libopencore_002damrwb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopencore_002damrwb" aria-hidden="true">TOC</a></span></h3>
- <p>libopencore-amrwb decoder wrapper.
- </p>
- <p>libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate
- Wideband audio codec. Using it requires the presence of the
- libopencore-amrwb headers and library during configuration. You need to
- explicitly configure the build with <code class="code">--enable-libopencore-amrwb</code>.
- </p>
- <p>An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB
- without this library.
- </p>
- <a name="libopus"></a>
- <h3 class="section">12.10 libopus<span class="pull-right"><a class="anchor hidden-xs" href="#libopus" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopus" aria-hidden="true">TOC</a></span></h3>
- <p>libopus decoder wrapper.
- </p>
- <p>libopus allows libavcodec to decode the Opus Interactive Audio Codec.
- Requires the presence of the libopus headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libopus</code>.
- </p>
- <p>An FFmpeg native decoder for Opus exists, so users can decode Opus
- without this library.
- </p>
- <a name="Subtitles-Decoders"></a>
- <h2 class="chapter">13 Subtitles Decoders<span class="pull-right"><a class="anchor hidden-xs" href="#Subtitles-Decoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Subtitles-Decoders" aria-hidden="true">TOC</a></span></h2>
- <a name="libaribb24"></a>
- <h3 class="section">13.1 libaribb24<span class="pull-right"><a class="anchor hidden-xs" href="#libaribb24" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libaribb24" aria-hidden="true">TOC</a></span></h3>
- <p>ARIB STD-B24 caption decoder.
- </p>
- <p>Implements profiles A and C of the ARIB STD-B24 standard.
- </p>
- <a name="libaribb24-Decoder-Options"></a>
- <h4 class="subsection">13.1.1 libaribb24 Decoder Options<span class="pull-right"><a class="anchor hidden-xs" href="#libaribb24-Decoder-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libaribb24-Decoder-Options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-aribb24-base-path <var class="var">path</var></samp></dt>
- <dd><p>Sets the base path for the libaribb24 library. This is utilized for reading of
- configuration files (for custom unicode conversions), and for dumping of
- non-text symbols as images under that location.
- </p>
- <p>Unset by default.
- </p>
- </dd>
- <dt><samp class="option">-aribb24-skip-ruby-text <var class="var">boolean</var></samp></dt>
- <dd><p>Tells the decoder wrapper to skip text blocks that contain half-height ruby
- text.
- </p>
- <p>Enabled by default.
- </p>
- </dd>
- </dl>
- <a name="libaribcaption"></a>
- <h3 class="section">13.2 libaribcaption<span class="pull-right"><a class="anchor hidden-xs" href="#libaribcaption" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libaribcaption" aria-hidden="true">TOC</a></span></h3>
- <p>Yet another ARIB STD-B24 caption decoder using external <em class="dfn">libaribcaption</em>
- library.
- </p>
- <p>Implements profiles A and C of the Japanese ARIB STD-B24 standard,
- Brazilian ABNT NBR 15606-1, and Philippines version of ISDB-T.
- </p>
- <p>Requires the presence of the libaribcaption headers and library
- (<a class="url" href="https://github.com/xqq/libaribcaption">https://github.com/xqq/libaribcaption</a>) during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libaribcaption</code>.
- If both <em class="dfn">libaribb24</em> and <em class="dfn">libaribcaption</em> are enabled, <em class="dfn">libaribcaption</em>
- decoder precedes.
- </p>
- <a name="libaribcaption-Decoder-Options"></a>
- <h4 class="subsection">13.2.1 libaribcaption Decoder Options<span class="pull-right"><a class="anchor hidden-xs" href="#libaribcaption-Decoder-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libaribcaption-Decoder-Options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-sub_type <var class="var">subtitle_type</var></samp></dt>
- <dd><p>Specifies the format of the decoded subtitles.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">bitmap</samp>’</dt>
- <dd><p>Graphical image.
- </p></dd>
- <dt>‘<samp class="samp">ass</samp>’</dt>
- <dd><p>ASS formatted text.
- </p></dd>
- <dt>‘<samp class="samp">text</samp>’</dt>
- <dd><p>Simple text based output without formatting.
- </p></dd>
- </dl>
- <p>The default is <em class="dfn">ass</em> as same as <em class="dfn">libaribb24</em> decoder.
- Some present players (e.g., <em class="dfn">mpv</em>) expect ASS format for ARIB caption.
- </p>
- </dd>
- <dt><samp class="option">-caption_encoding <var class="var">encoding_scheme</var></samp></dt>
- <dd><p>Specifies the encoding scheme of input subtitle text.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Automatically detect text encoding (default).
- </p></dd>
- <dt>‘<samp class="samp">jis</samp>’</dt>
- <dd><p>8bit-char JIS encoding defined in ARIB STD B24.
- This encoding used in Japan for ISDB captions.
- </p></dd>
- <dt>‘<samp class="samp">utf8</samp>’</dt>
- <dd><p>UTF-8 encoding defined in ARIB STD B24.
- This encoding is used in Philippines for ISDB-T captions.
- </p></dd>
- <dt>‘<samp class="samp">latin</samp>’</dt>
- <dd><p>Latin character encoding defined in ABNT NBR 15606-1.
- This encoding is used in South America for SBTVD / ISDB-Tb captions.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-font <var class="var">font_name[,font_name2,...]</var></samp></dt>
- <dd><p>Specify comma-separated list of font family names to be used for <em class="dfn">bitmap</em>
- or <em class="dfn">ass</em> type subtitle rendering.
- Only first font name is used for <em class="dfn">ass</em> type subtitle.
- </p>
- <p>If not specified, use internally defined default font family.
- </p>
- </dd>
- <dt><samp class="option">-ass_single_rect <var class="var">boolean</var></samp></dt>
- <dd><p>ARIB STD-B24 specifies that some captions may be displayed at different
- positions at a time (multi-rectangle subtitle).
- Since some players (e.g., old <em class="dfn">mpv</em>) can’t handle multiple ASS rectangles
- in a single AVSubtitle, or multiple ASS rectangles of indeterminate duration
- with the same start timestamp, this option can change the behavior so that
- all the texts are displayed in a single ASS rectangle.
- </p>
- <p>The default is <var class="var">false</var>.
- </p>
- <p>If your player cannot handle AVSubtitles with multiple ASS rectangles properly,
- set this option to <var class="var">true</var> or define <code class="env">ASS_SINGLE_RECT=1</code> to change
- default behavior at compilation.
- </p>
- </dd>
- <dt><samp class="option">-force_outline_text <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether always render outline text for all characters regardless of
- the indication by character style.
- </p>
- <p>The default is <var class="var">false</var>.
- </p>
- </dd>
- <dt><samp class="option">-outline_width <var class="var">number</var> (0.0 - 3.0)</samp></dt>
- <dd><p>Specify width for outline text, in dots (relative).
- </p>
- <p>The default is <var class="var">1.5</var>.
- </p>
- </dd>
- <dt><samp class="option">-ignore_background <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether to ignore background color rendering.
- </p>
- <p>The default is <var class="var">false</var>.
- </p>
- </dd>
- <dt><samp class="option">-ignore_ruby <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether to ignore rendering for ruby-like (furigana) characters.
- </p>
- <p>The default is <var class="var">false</var>.
- </p>
- </dd>
- <dt><samp class="option">-replace_drcs <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether to render replaced DRCS characters as Unicode characters.
- </p>
- <p>The default is <var class="var">true</var>.
- </p>
- </dd>
- <dt><samp class="option">-replace_msz_ascii <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether to replace MSZ (Middle Size; half width) fullwidth
- alphanumerics with halfwidth alphanumerics.
- </p>
- <p>The default is <var class="var">true</var>.
- </p>
- </dd>
- <dt><samp class="option">-replace_msz_japanese <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether to replace some MSZ (Middle Size; half width) fullwidth
- japanese special characters with halfwidth ones.
- </p>
- <p>The default is <var class="var">true</var>.
- </p>
- </dd>
- <dt><samp class="option">-replace_msz_glyph <var class="var">boolean</var></samp></dt>
- <dd><p>Specify whether to replace MSZ (Middle Size; half width) characters
- with halfwidth glyphs if the fonts supports it.
- This option works under FreeType or DirectWrite renderer
- with Adobe-Japan1 compliant fonts.
- e.g., IBM Plex Sans JP, Morisawa BIZ UDGothic, Morisawa BIZ UDMincho,
- Yu Gothic, Yu Mincho, and Meiryo.
- </p>
- <p>The default is <var class="var">true</var>.
- </p>
- </dd>
- <dt><samp class="option">-canvas_size <var class="var">image_size</var></samp></dt>
- <dd><p>Specify the resolution of the canvas to render subtitles to; usually, this
- should be frame size of input video.
- This only applies when <code class="code">-subtitle_type</code> is set to <var class="var">bitmap</var>.
- </p>
- <p>The libaribcaption decoder assumes input frame size for bitmap rendering as below:
- </p><ol class="enumerate">
- <li> PROFILE_A : 1440 x 1080 with SAR (PAR) 4:3
- </li><li> PROFILE_C : 320 x 180 with SAR (PAR) 1:1
- </li></ol>
- <p>If actual frame size of input video does not match above assumption,
- the rendered captions may be distorted.
- To make the captions undistorted, add <code class="code">-canvas_size</code> option to specify
- actual input video size.
- </p>
- <p>Note that the <code class="code">-canvas_size</code> option is not required for video with
- different size but same aspect ratio.
- In such cases, the caption will be stretched or shrunk to actual video size
- if <code class="code">-canvas_size</code> option is not specified.
- If <code class="code">-canvas_size</code> option is specified with different size,
- the caption will be stretched or shrunk as specified size with calculated SAR.
- </p>
- </dd>
- </dl>
- <a name="libaribcaption-decoder-usage-examples"></a>
- <h4 class="subsection">13.2.2 libaribcaption decoder usage examples<span class="pull-right"><a class="anchor hidden-xs" href="#libaribcaption-decoder-usage-examples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libaribcaption-decoder-usage-examples" aria-hidden="true">TOC</a></span></h4>
- <p>Display MPEG-TS file with ARIB subtitle by <code class="code">ffplay</code> tool:
- </p><div class="example">
- <pre class="example-preformatted">ffplay -sub_type bitmap MPEG.TS
- </pre></div>
- <p>Display MPEG-TS file with input frame size 1920x1080 by <code class="code">ffplay</code> tool:
- </p><div class="example">
- <pre class="example-preformatted">ffplay -sub_type bitmap -canvas_size 1920x1080 MPEG.TS
- </pre></div>
- <p>Embed ARIB subtitle in transcoded video:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -sub_type bitmap -i src.m2t -filter_complex "[0:v][0:s]overlay" -vcodec h264 dest.mp4
- </pre></div>
- <a name="dvbsub"></a>
- <h3 class="section">13.3 dvbsub<span class="pull-right"><a class="anchor hidden-xs" href="#dvbsub" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dvbsub" aria-hidden="true">TOC</a></span></h3>
- <a name="Options-9"></a>
- <h4 class="subsection">13.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-9" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-9" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">compute_clut</samp></dt>
- <dd><dl class="table">
- <dt><samp class="option">-2</samp></dt>
- <dd><p>Compute clut once if no matching CLUT is in the stream.
- </p></dd>
- <dt><samp class="option">-1</samp></dt>
- <dd><p>Compute clut if no matching CLUT is in the stream.
- </p></dd>
- <dt><samp class="option">0</samp></dt>
- <dd><p>Never compute CLUT
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dd><p>Always compute CLUT and override the one provided in the stream.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dvb_substream</samp></dt>
- <dd><p>Selects the dvb substream, or all substreams if -1 which is default.
- </p>
- </dd>
- </dl>
- <a name="dvdsub"></a>
- <h3 class="section">13.4 dvdsub<span class="pull-right"><a class="anchor hidden-xs" href="#dvdsub" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dvdsub" aria-hidden="true">TOC</a></span></h3>
- <p>This codec decodes the bitmap subtitles used in DVDs; the same subtitles can
- also be found in VobSub file pairs and in some Matroska files.
- </p>
- <a name="Options-10"></a>
- <h4 class="subsection">13.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-10" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-10" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">palette</samp></dt>
- <dd><p>Specify the global palette used by the bitmaps. When stored in VobSub, the
- palette is normally specified in the index file; in Matroska, the palette is
- stored in the codec extra-data in the same format as in VobSub. In DVDs, the
- palette is stored in the IFO file, and therefore not available when reading
- from dumped VOB files.
- </p>
- <p>The format for this option is a string containing 16 24-bits hexadecimal
- numbers (without 0x prefix) separated by commas, for example <code class="code">0d00ee,
- ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
- 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b</code>.
- </p>
- </dd>
- <dt><samp class="option">ifo_palette</samp></dt>
- <dd><p>Specify the IFO file from which the global palette is obtained.
- (experimental)
- </p>
- </dd>
- <dt><samp class="option">forced_subs_only</samp></dt>
- <dd><p>Only decode subtitle entries marked as forced. Some titles have forced
- and non-forced subtitles in the same track. Setting this flag to <code class="code">1</code>
- will only keep the forced subtitles. Default value is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="libzvbi_002dteletext"></a>
- <h3 class="section">13.5 libzvbi-teletext<span class="pull-right"><a class="anchor hidden-xs" href="#libzvbi_002dteletext" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libzvbi_002dteletext" aria-hidden="true">TOC</a></span></h3>
- <p>Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext
- subtitles. Requires the presence of the libzvbi headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libzvbi</code>.
- </p>
- <a name="Options-11"></a>
- <h4 class="subsection">13.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-11" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-11" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">txt_page</samp></dt>
- <dd><p>List of teletext page numbers to decode. Pages that do not match the specified
- list are dropped. You may use the special <code class="code">*</code> string to match all pages,
- or <code class="code">subtitle</code> to match all subtitle pages.
- Default value is *.
- </p></dd>
- <dt><samp class="option">txt_default_region</samp></dt>
- <dd><p>Set default character set used for decoding, a value between 0 and 87 (see
- ETS 300 706, Section 15, Table 32). Default value is -1, which does not
- override the libzvbi default. This option is needed for some legacy level 1.0
- transmissions which cannot signal the proper charset.
- </p></dd>
- <dt><samp class="option">txt_chop_top</samp></dt>
- <dd><p>Discards the top teletext line. Default value is 1.
- </p></dd>
- <dt><samp class="option">txt_format</samp></dt>
- <dd><p>Specifies the format of the decoded subtitles.
- </p><dl class="table">
- <dt><samp class="option">bitmap</samp></dt>
- <dd><p>The default format, you should use this for teletext pages, because certain
- graphics and colors cannot be expressed in simple text or even ASS.
- </p></dd>
- <dt><samp class="option">text</samp></dt>
- <dd><p>Simple text based output without formatting.
- </p></dd>
- <dt><samp class="option">ass</samp></dt>
- <dd><p>Formatted ASS output, subtitle pages and teletext pages are returned in
- different styles, subtitle pages are stripped down to text, but an effort is
- made to keep the text alignment and the formatting.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">txt_left</samp></dt>
- <dd><p>X offset of generated bitmaps, default is 0.
- </p></dd>
- <dt><samp class="option">txt_top</samp></dt>
- <dd><p>Y offset of generated bitmaps, default is 0.
- </p></dd>
- <dt><samp class="option">txt_chop_spaces</samp></dt>
- <dd><p>Chops leading and trailing spaces and removes empty lines from the generated
- text. This option is useful for teletext based subtitles where empty spaces may
- be present at the start or at the end of the lines or empty lines may be
- present between the subtitle lines because of double-sized teletext characters.
- Default value is 1.
- </p></dd>
- <dt><samp class="option">txt_duration</samp></dt>
- <dd><p>Sets the display duration of the decoded teletext pages or subtitles in
- milliseconds. Default value is -1 which means infinity or until the next
- subtitle event comes.
- </p></dd>
- <dt><samp class="option">txt_transparent</samp></dt>
- <dd><p>Force transparent background of the generated teletext bitmaps. Default value
- is 0 which means an opaque background.
- </p></dd>
- <dt><samp class="option">txt_opacity</samp></dt>
- <dd><p>Sets the opacity (0-255) of the teletext background. If
- <samp class="option">txt_transparent</samp> is not set, it only affects characters between a start
- box and an end box, typically subtitles. Default value is 0 if
- <samp class="option">txt_transparent</samp> is set, 255 otherwise.
- </p>
- </dd>
- </dl>
- <a name="Encoders"></a>
- <h2 class="chapter">14 Encoders<span class="pull-right"><a class="anchor hidden-xs" href="#Encoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Encoders" aria-hidden="true">TOC</a></span></h2>
- <p>Encoders are configured elements in FFmpeg which allow the encoding of
- multimedia streams.
- </p>
- <p>When you configure your FFmpeg build, all the supported native encoders
- are enabled by default. Encoders requiring an external library must be enabled
- manually via the corresponding <code class="code">--enable-lib</code> option. You can list all
- available encoders using the configure option <code class="code">--list-encoders</code>.
- </p>
- <p>You can disable all the encoders with the configure option
- <code class="code">--disable-encoders</code> and selectively enable / disable single encoders
- with the options <code class="code">--enable-encoder=<var class="var">ENCODER</var></code> /
- <code class="code">--disable-encoder=<var class="var">ENCODER</var></code>.
- </p>
- <p>The option <code class="code">-encoders</code> of the ff* tools will display the list of
- enabled encoders.
- </p>
- <a name="Audio-Encoders"></a>
- <h2 class="chapter">15 Audio Encoders<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Encoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Encoders" aria-hidden="true">TOC</a></span></h2>
- <p>A description of some of the currently available audio encoders
- follows.
- </p>
- <a class="anchor" id="aacenc"></a><a name="aac"></a>
- <h3 class="section">15.1 aac<span class="pull-right"><a class="anchor hidden-xs" href="#aac" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aac" aria-hidden="true">TOC</a></span></h3>
- <p>Advanced Audio Coding (AAC) encoder.
- </p>
- <p>This encoder is the default AAC encoder, natively implemented into FFmpeg.
- </p>
- <a name="Options-12"></a>
- <h4 class="subsection">15.1.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-12" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-12" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set bit rate in bits/s. Setting this automatically activates constant bit rate
- (CBR) mode. If this option is unspecified it is set to 128kbps.
- </p>
- </dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Set quality for variable bit rate (VBR) mode. This option is valid only using
- the <code class="command">ffmpeg</code> command-line tool. For library interface users, use
- <samp class="option">global_quality</samp>.
- </p>
- </dd>
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set cutoff frequency. If unspecified will allow the encoder to dynamically
- adjust the cutoff to improve clarity on low bitrates.
- </p>
- </dd>
- <dt><samp class="option">aac_coder</samp></dt>
- <dd><p>Set AAC encoder coding method. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">twoloop</samp>’</dt>
- <dd><p>Two loop searching (TLS) method. This is the default method.
- </p>
- <p>This method first sets quantizers depending on band thresholds and then tries
- to find an optimal combination by adding or subtracting a specific value from
- all quantizers and adjusting some individual quantizer a little. Will tune
- itself based on whether <samp class="option">aac_is</samp>, <samp class="option">aac_ms</samp> and <samp class="option">aac_pns</samp>
- are enabled.
- </p>
- </dd>
- <dt>‘<samp class="samp">anmr</samp>’</dt>
- <dd><p>Average noise to mask ratio (ANMR) trellis-based solution.
- </p>
- <p>This is an experimental coder which currently produces a lower quality, is more
- unstable and is slower than the default twoloop coder but has potential.
- Currently has no support for the <samp class="option">aac_is</samp> or <samp class="option">aac_pns</samp> options.
- Not currently recommended.
- </p>
- </dd>
- <dt>‘<samp class="samp">fast</samp>’</dt>
- <dd><p>Constant quantizer method.
- </p>
- <p>Uses a cheaper version of twoloop algorithm that doesn’t try to do as many
- clever adjustments. Worse with low bitrates (less than 64kbps), but is better
- and much faster at higher bitrates.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">aac_ms</samp></dt>
- <dd><p>Sets mid/side coding mode. The default value of "auto" will automatically use
- M/S with bands which will benefit from such coding. Can be forced for all bands
- using the value "enable", which is mainly useful for debugging or disabled using
- "disable".
- </p>
- </dd>
- <dt><samp class="option">aac_is</samp></dt>
- <dd><p>Sets intensity stereo coding tool usage. By default, it’s enabled and will
- automatically toggle IS for similar pairs of stereo bands if it’s beneficial.
- Can be disabled for debugging by setting the value to "disable".
- </p>
- </dd>
- <dt><samp class="option">aac_pns</samp></dt>
- <dd><p>Uses perceptual noise substitution to replace low entropy high frequency bands
- with imperceptible white noise during the decoding process. By default, it’s
- enabled, but can be disabled for debugging purposes by using "disable".
- </p>
- </dd>
- <dt><samp class="option">aac_tns</samp></dt>
- <dd><p>Enables the use of a multitap FIR filter which spans through the high frequency
- bands to hide quantization noise during the encoding process and is reverted
- by the decoder. As well as decreasing unpleasant artifacts in the high range
- this also reduces the entropy in the high bands and allows for more bits to
- be used by the mid-low bands. By default it’s enabled but can be disabled for
- debugging by setting the option to "disable".
- </p>
- </dd>
- <dt><samp class="option">aac_ltp</samp></dt>
- <dd><p>Enables the use of the long term prediction extension which increases coding
- efficiency in very low bandwidth situations such as encoding of voice or
- solo piano music by extending constant harmonic peaks in bands throughout
- frames. This option is implied by profile:a aac_low.
- Use in conjunction with <samp class="option">-ar</samp> to decrease the samplerate.
- </p>
- </dd>
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Sets the encoding profile, possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">aac_low</samp>’</dt>
- <dd><p>The default, AAC "Low-complexity" profile. Is the most compatible and produces
- decent quality.
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg2_aac_low</samp>’</dt>
- <dd><p>Equivalent to <code class="code">-profile:a aac_low -aac_pns 0</code>. PNS was introduced with the
- MPEG4 specifications.
- </p>
- </dd>
- <dt>‘<samp class="samp">aac_ltp</samp>’</dt>
- <dd><p>Long term prediction profile, is enabled by and will enable the <samp class="option">aac_ltp</samp>
- option. Introduced in MPEG4.
- </p>
- </dd>
- </dl>
- <p>If this option is unspecified it is set to ‘<samp class="samp">aac_low</samp>’.
- </p></dd>
- </dl>
- <a name="ac3-and-ac3_005ffixed"></a>
- <h3 class="section">15.2 ac3 and ac3_fixed<span class="pull-right"><a class="anchor hidden-xs" href="#ac3-and-ac3_005ffixed" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ac3-and-ac3_005ffixed" aria-hidden="true">TOC</a></span></h3>
- <p>AC-3 audio encoders.
- </p>
- <p>These encoders implement part of ATSC A/52:2010 and ETSI TS 102 366.
- </p>
- <p>The <var class="var">ac3</var> encoder uses floating-point math, while the <var class="var">ac3_fixed</var>
- encoder only uses fixed-point integer math. This does not mean that one is
- always faster, just that one or the other may be better suited to a
- particular system. The <var class="var">ac3_fixed</var> encoder is not the default codec for
- any of the output formats, so it must be specified explicitly using the option
- <code class="code">-acodec ac3_fixed</code> in order to use it.
- </p>
- <a name="AC_002d3-Metadata"></a>
- <h4 class="subsection">15.2.1 AC-3 Metadata<span class="pull-right"><a class="anchor hidden-xs" href="#AC_002d3-Metadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AC_002d3-Metadata" aria-hidden="true">TOC</a></span></h4>
- <p>The AC-3 metadata options are used to set parameters that describe the audio,
- but in most cases do not affect the audio encoding itself. Some of the options
- do directly affect or influence the decoding and playback of the resulting
- bitstream, while others are just for informational purposes. A few of the
- options will add bits to the output stream that could otherwise be used for
- audio data, and will thus affect the quality of the output. Those will be
- indicated accordingly with a note in the option list below.
- </p>
- <p>These parameters are described in detail in several publicly-available
- documents.
- </p><ul class="itemize mark-bullet">
- <li><a class="uref" href="http://www.atsc.org/cms/standards/a_52-2010.pdf">A/52:2010 - Digital Audio Compression (AC-3) (E-AC-3) Standard</a>
- </li><li><a class="uref" href="http://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf">A/54 - Guide to the Use of the ATSC Digital Television Standard</a>
- </li><li><a class="uref" href="http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/18_Metadata.Guide.pdf">Dolby Metadata Guide</a>
- </li><li><a class="uref" href="http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf">Dolby Digital Professional Encoding Guidelines</a>
- </li></ul>
- <a name="Metadata-Control-Options"></a>
- <h4 class="subsubsection">15.2.1.1 Metadata Control Options<span class="pull-right"><a class="anchor hidden-xs" href="#Metadata-Control-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Metadata-Control-Options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-per_frame_metadata <var class="var">boolean</var></samp></dt>
- <dd><p>Allow Per-Frame Metadata. Specifies if the encoder should check for changing
- metadata for each frame.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dd><p>The metadata values set at initialization will be used for every frame in the
- stream. (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dd><p>Metadata values can be changed before encoding each frame.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Downmix-Levels"></a>
- <h4 class="subsubsection">15.2.1.2 Downmix Levels<span class="pull-right"><a class="anchor hidden-xs" href="#Downmix-Levels" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Downmix-Levels" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-center_mixlev <var class="var">level</var></samp></dt>
- <dd><p>Center Mix Level. The amount of gain the decoder should apply to the center
- channel when downmixing to stereo. This field will only be written to the
- bitstream if a center channel is present. The value is specified as a scale
- factor. There are 3 valid values:
- </p><dl class="table">
- <dt><samp class="option">0.707</samp></dt>
- <dd><p>Apply -3dB gain
- </p></dd>
- <dt><samp class="option">0.595</samp></dt>
- <dd><p>Apply -4.5dB gain (default)
- </p></dd>
- <dt><samp class="option">0.500</samp></dt>
- <dd><p>Apply -6dB gain
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-surround_mixlev <var class="var">level</var></samp></dt>
- <dd><p>Surround Mix Level. The amount of gain the decoder should apply to the surround
- channel(s) when downmixing to stereo. This field will only be written to the
- bitstream if one or more surround channels are present. The value is specified
- as a scale factor. There are 3 valid values:
- </p><dl class="table">
- <dt><samp class="option">0.707</samp></dt>
- <dd><p>Apply -3dB gain
- </p></dd>
- <dt><samp class="option">0.500</samp></dt>
- <dd><p>Apply -6dB gain (default)
- </p></dd>
- <dt><samp class="option">0.000</samp></dt>
- <dd><p>Silence Surround Channel(s)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Audio-Production-Information"></a>
- <h4 class="subsubsection">15.2.1.3 Audio Production Information<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Production-Information" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Production-Information" aria-hidden="true">TOC</a></span></h4>
- <p>Audio Production Information is optional information describing the mixing
- environment. Either none or both of the fields are written to the bitstream.
- </p>
- <dl class="table">
- <dt><samp class="option">-mixing_level <var class="var">number</var></samp></dt>
- <dd><p>Mixing Level. Specifies peak sound pressure level (SPL) in the production
- environment when the mix was mastered. Valid values are 80 to 111, or -1 for
- unknown or not indicated. The default value is -1, but that value cannot be
- used if the Audio Production Information is written to the bitstream. Therefore,
- if the <code class="code">room_type</code> option is not the default value, the <code class="code">mixing_level</code>
- option must not be -1.
- </p>
- </dd>
- <dt><samp class="option">-room_type <var class="var">type</var></samp></dt>
- <dd><p>Room Type. Describes the equalization used during the final mixing session at
- the studio or on the dubbing stage. A large room is a dubbing stage with the
- industry standard X-curve equalization; a small room has flat equalization.
- This field will not be written to the bitstream if both the <code class="code">mixing_level</code>
- option and the <code class="code">room_type</code> option have the default values.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">notindicated</samp></dt>
- <dd><p>Not Indicated (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">large</samp></dt>
- <dd><p>Large Room
- </p></dd>
- <dt><samp class="option">2</samp></dt>
- <dt><samp class="option">small</samp></dt>
- <dd><p>Small Room
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Other-Metadata-Options"></a>
- <h4 class="subsubsection">15.2.1.4 Other Metadata Options<span class="pull-right"><a class="anchor hidden-xs" href="#Other-Metadata-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Other-Metadata-Options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-copyright <var class="var">boolean</var></samp></dt>
- <dd><p>Copyright Indicator. Specifies whether a copyright exists for this audio.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">off</samp></dt>
- <dd><p>No Copyright Exists (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Copyright Exists
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-dialnorm <var class="var">value</var></samp></dt>
- <dd><p>Dialogue Normalization. Indicates how far the average dialogue level of the
- program is below digital 100% full scale (0 dBFS). This parameter determines a
- level shift during audio reproduction that sets the average volume of the
- dialogue to a preset level. The goal is to match volume level between program
- sources. A value of -31dB will result in no volume level change, relative to
- the source volume, during audio reproduction. Valid values are whole numbers in
- the range -31 to -1, with -31 being the default.
- </p>
- </dd>
- <dt><samp class="option">-dsur_mode <var class="var">mode</var></samp></dt>
- <dd><p>Dolby Surround Mode. Specifies whether the stereo signal uses Dolby Surround
- (Pro Logic). This field will only be written to the bitstream if the audio
- stream is stereo. Using this option does <b class="b">NOT</b> mean the encoder will actually
- apply Dolby Surround processing.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">notindicated</samp></dt>
- <dd><p>Not Indicated (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">off</samp></dt>
- <dd><p>Not Dolby Surround Encoded
- </p></dd>
- <dt><samp class="option">2</samp></dt>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Dolby Surround Encoded
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-original <var class="var">boolean</var></samp></dt>
- <dd><p>Original Bit Stream Indicator. Specifies whether this audio is from the
- original source and not a copy.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">off</samp></dt>
- <dd><p>Not Original Source
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Original Source (default)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Extended-Bitstream-Information"></a>
- <h4 class="subsection">15.2.2 Extended Bitstream Information<span class="pull-right"><a class="anchor hidden-xs" href="#Extended-Bitstream-Information" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Extended-Bitstream-Information" aria-hidden="true">TOC</a></span></h4>
- <p>The extended bitstream options are part of the Alternate Bit Stream Syntax as
- specified in Annex D of the A/52:2010 standard. It is grouped into 2 parts.
- If any one parameter in a group is specified, all values in that group will be
- written to the bitstream. Default values are used for those that are written
- but have not been specified. If the mixing levels are written, the decoder
- will use these values instead of the ones specified in the <code class="code">center_mixlev</code>
- and <code class="code">surround_mixlev</code> options if it supports the Alternate Bit Stream
- Syntax.
- </p>
- <a name="Extended-Bitstream-Information-_002d-Part-1"></a>
- <h4 class="subsubsection">15.2.2.1 Extended Bitstream Information - Part 1<span class="pull-right"><a class="anchor hidden-xs" href="#Extended-Bitstream-Information-_002d-Part-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Extended-Bitstream-Information-_002d-Part-1" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-dmix_mode <var class="var">mode</var></samp></dt>
- <dd><p>Preferred Stereo Downmix Mode. Allows the user to select either Lt/Rt
- (Dolby Surround) or Lo/Ro (normal stereo) as the preferred stereo downmix mode.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">notindicated</samp></dt>
- <dd><p>Not Indicated (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">ltrt</samp></dt>
- <dd><p>Lt/Rt Downmix Preferred
- </p></dd>
- <dt><samp class="option">2</samp></dt>
- <dt><samp class="option">loro</samp></dt>
- <dd><p>Lo/Ro Downmix Preferred
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-ltrt_cmixlev <var class="var">level</var></samp></dt>
- <dd><p>Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the
- center channel when downmixing to stereo in Lt/Rt mode.
- </p><dl class="table">
- <dt><samp class="option">1.414</samp></dt>
- <dd><p>Apply +3dB gain
- </p></dd>
- <dt><samp class="option">1.189</samp></dt>
- <dd><p>Apply +1.5dB gain
- </p></dd>
- <dt><samp class="option">1.000</samp></dt>
- <dd><p>Apply 0dB gain
- </p></dd>
- <dt><samp class="option">0.841</samp></dt>
- <dd><p>Apply -1.5dB gain
- </p></dd>
- <dt><samp class="option">0.707</samp></dt>
- <dd><p>Apply -3.0dB gain
- </p></dd>
- <dt><samp class="option">0.595</samp></dt>
- <dd><p>Apply -4.5dB gain (default)
- </p></dd>
- <dt><samp class="option">0.500</samp></dt>
- <dd><p>Apply -6.0dB gain
- </p></dd>
- <dt><samp class="option">0.000</samp></dt>
- <dd><p>Silence Center Channel
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-ltrt_surmixlev <var class="var">level</var></samp></dt>
- <dd><p>Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the
- surround channel(s) when downmixing to stereo in Lt/Rt mode.
- </p><dl class="table">
- <dt><samp class="option">0.841</samp></dt>
- <dd><p>Apply -1.5dB gain
- </p></dd>
- <dt><samp class="option">0.707</samp></dt>
- <dd><p>Apply -3.0dB gain
- </p></dd>
- <dt><samp class="option">0.595</samp></dt>
- <dd><p>Apply -4.5dB gain
- </p></dd>
- <dt><samp class="option">0.500</samp></dt>
- <dd><p>Apply -6.0dB gain (default)
- </p></dd>
- <dt><samp class="option">0.000</samp></dt>
- <dd><p>Silence Surround Channel(s)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-loro_cmixlev <var class="var">level</var></samp></dt>
- <dd><p>Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the
- center channel when downmixing to stereo in Lo/Ro mode.
- </p><dl class="table">
- <dt><samp class="option">1.414</samp></dt>
- <dd><p>Apply +3dB gain
- </p></dd>
- <dt><samp class="option">1.189</samp></dt>
- <dd><p>Apply +1.5dB gain
- </p></dd>
- <dt><samp class="option">1.000</samp></dt>
- <dd><p>Apply 0dB gain
- </p></dd>
- <dt><samp class="option">0.841</samp></dt>
- <dd><p>Apply -1.5dB gain
- </p></dd>
- <dt><samp class="option">0.707</samp></dt>
- <dd><p>Apply -3.0dB gain
- </p></dd>
- <dt><samp class="option">0.595</samp></dt>
- <dd><p>Apply -4.5dB gain (default)
- </p></dd>
- <dt><samp class="option">0.500</samp></dt>
- <dd><p>Apply -6.0dB gain
- </p></dd>
- <dt><samp class="option">0.000</samp></dt>
- <dd><p>Silence Center Channel
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-loro_surmixlev <var class="var">level</var></samp></dt>
- <dd><p>Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the
- surround channel(s) when downmixing to stereo in Lo/Ro mode.
- </p><dl class="table">
- <dt><samp class="option">0.841</samp></dt>
- <dd><p>Apply -1.5dB gain
- </p></dd>
- <dt><samp class="option">0.707</samp></dt>
- <dd><p>Apply -3.0dB gain
- </p></dd>
- <dt><samp class="option">0.595</samp></dt>
- <dd><p>Apply -4.5dB gain
- </p></dd>
- <dt><samp class="option">0.500</samp></dt>
- <dd><p>Apply -6.0dB gain (default)
- </p></dd>
- <dt><samp class="option">0.000</samp></dt>
- <dd><p>Silence Surround Channel(s)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Extended-Bitstream-Information-_002d-Part-2"></a>
- <h4 class="subsubsection">15.2.2.2 Extended Bitstream Information - Part 2<span class="pull-right"><a class="anchor hidden-xs" href="#Extended-Bitstream-Information-_002d-Part-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Extended-Bitstream-Information-_002d-Part-2" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-dsurex_mode <var class="var">mode</var></samp></dt>
- <dd><p>Dolby Surround EX Mode. Indicates whether the stream uses Dolby Surround EX
- (7.1 matrixed to 5.1). Using this option does <b class="b">NOT</b> mean the encoder will actually
- apply Dolby Surround EX processing.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">notindicated</samp></dt>
- <dd><p>Not Indicated (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Dolby Surround EX Off
- </p></dd>
- <dt><samp class="option">2</samp></dt>
- <dt><samp class="option">off</samp></dt>
- <dd><p>Dolby Surround EX On
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-dheadphone_mode <var class="var">mode</var></samp></dt>
- <dd><p>Dolby Headphone Mode. Indicates whether the stream uses Dolby Headphone
- encoding (multi-channel matrixed to 2.0 for use with headphones). Using this
- option does <b class="b">NOT</b> mean the encoder will actually apply Dolby Headphone
- processing.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">notindicated</samp></dt>
- <dd><p>Not Indicated (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Dolby Headphone Off
- </p></dd>
- <dt><samp class="option">2</samp></dt>
- <dt><samp class="option">off</samp></dt>
- <dd><p>Dolby Headphone On
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-ad_conv_type <var class="var">type</var></samp></dt>
- <dd><p>A/D Converter Type. Indicates whether the audio has passed through HDCD A/D
- conversion.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">standard</samp></dt>
- <dd><p>Standard A/D Converter (default)
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">hdcd</samp></dt>
- <dd><p>HDCD A/D Converter
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Other-AC_002d3-Encoding-Options"></a>
- <h4 class="subsection">15.2.3 Other AC-3 Encoding Options<span class="pull-right"><a class="anchor hidden-xs" href="#Other-AC_002d3-Encoding-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Other-AC_002d3-Encoding-Options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-stereo_rematrixing <var class="var">boolean</var></samp></dt>
- <dd><p>Stereo Rematrixing. Enables/Disables use of rematrixing for stereo input. This
- is an optional AC-3 feature that increases quality by selectively encoding
- the left/right channels as mid/side. This option is enabled by default, and it
- is highly recommended that it be left as enabled except for testing purposes.
- </p>
- </dd>
- <dt><samp class="option">cutoff <var class="var">frequency</var></samp></dt>
- <dd><p>Set lowpass cutoff frequency. If unspecified, the encoder selects a default
- determined by various other encoding parameters.
- </p>
- </dd>
- </dl>
- <a name="Floating_002dPoint_002dOnly-AC_002d3-Encoding-Options"></a>
- <h4 class="subsection">15.2.4 Floating-Point-Only AC-3 Encoding Options<span class="pull-right"><a class="anchor hidden-xs" href="#Floating_002dPoint_002dOnly-AC_002d3-Encoding-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Floating_002dPoint_002dOnly-AC_002d3-Encoding-Options" aria-hidden="true">TOC</a></span></h4>
- <p>These options are only valid for the floating-point encoder and do not exist
- for the fixed-point encoder due to the corresponding features not being
- implemented in fixed-point.
- </p>
- <dl class="table">
- <dt><samp class="option">-channel_coupling <var class="var">boolean</var></samp></dt>
- <dd><p>Enables/Disables use of channel coupling, which is an optional AC-3 feature
- that increases quality by combining high frequency information from multiple
- channels into a single channel. The per-channel high frequency information is
- sent with less accuracy in both the frequency and time domains. This allows
- more bits to be used for lower frequencies while preserving enough information
- to reconstruct the high frequencies. This option is enabled by default for the
- floating-point encoder and should generally be left as enabled except for
- testing purposes or to increase encoding speed.
- </p><dl class="table">
- <dt><samp class="option">-1</samp></dt>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Selected by Encoder (default)
- </p></dd>
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">off</samp></dt>
- <dd><p>Disable Channel Coupling
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Enable Channel Coupling
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-cpl_start_band <var class="var">number</var></samp></dt>
- <dd><p>Coupling Start Band. Sets the channel coupling start band, from 1 to 15. If a
- value higher than the bandwidth is used, it will be reduced to 1 less than the
- coupling end band. If <var class="var">auto</var> is used, the start band will be determined by
- the encoder based on the bit rate, sample rate, and channel layout. This option
- has no effect if channel coupling is disabled.
- </p><dl class="table">
- <dt><samp class="option">-1</samp></dt>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Selected by Encoder (default)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="flac"></a><a name="flac-2"></a>
- <h3 class="section">15.3 flac<span class="pull-right"><a class="anchor hidden-xs" href="#flac-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flac-2" aria-hidden="true">TOC</a></span></h3>
- <p>FLAC (Free Lossless Audio Codec) Encoder
- </p>
- <a name="Options-13"></a>
- <h4 class="subsection">15.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-13" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-13" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by FFmpeg’s flac encoder.
- </p>
- <dl class="table">
- <dt><samp class="option">compression_level</samp></dt>
- <dd><p>Sets the compression level, which chooses defaults for many other options
- if they are not set explicitly. Valid values are from 0 to 12, 5 is the
- default.
- </p>
- </dd>
- <dt><samp class="option">frame_size</samp></dt>
- <dd><p>Sets the size of the frames in samples per channel.
- </p>
- </dd>
- <dt><samp class="option">lpc_coeff_precision</samp></dt>
- <dd><p>Sets the LPC coefficient precision, valid values are from 1 to 15, 15 is the
- default.
- </p>
- </dd>
- <dt><samp class="option">lpc_type</samp></dt>
- <dd><p>Sets the first stage LPC algorithm
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>LPC is not used
- </p>
- </dd>
- <dt>‘<samp class="samp">fixed</samp>’</dt>
- <dd><p>fixed LPC coefficients
- </p>
- </dd>
- <dt>‘<samp class="samp">levinson</samp>’</dt>
- <dt>‘<samp class="samp">cholesky</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">lpc_passes</samp></dt>
- <dd><p>Number of passes to use for Cholesky factorization during LPC analysis
- </p>
- </dd>
- <dt><samp class="option">min_partition_order</samp></dt>
- <dd><p>The minimum partition order
- </p>
- </dd>
- <dt><samp class="option">max_partition_order</samp></dt>
- <dd><p>The maximum partition order
- </p>
- </dd>
- <dt><samp class="option">prediction_order_method</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">estimation</samp>’</dt>
- <dt>‘<samp class="samp">2level</samp>’</dt>
- <dt>‘<samp class="samp">4level</samp>’</dt>
- <dt>‘<samp class="samp">8level</samp>’</dt>
- <dt>‘<samp class="samp">search</samp>’</dt>
- <dd><p>Bruteforce search
- </p></dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">ch_mode</samp></dt>
- <dd><p>Channel mode
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>The mode is chosen automatically for each frame
- </p></dd>
- <dt>‘<samp class="samp">indep</samp>’</dt>
- <dd><p>Channels are independently coded
- </p></dd>
- <dt>‘<samp class="samp">left_side</samp>’</dt>
- <dt>‘<samp class="samp">right_side</samp>’</dt>
- <dt>‘<samp class="samp">mid_side</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">exact_rice_parameters</samp></dt>
- <dd><p>Chooses if rice parameters are calculated exactly or approximately.
- if set to 1 then they are chosen exactly, which slows the code down slightly and
- improves compression slightly.
- </p>
- </dd>
- <dt><samp class="option">multi_dim_quant</samp></dt>
- <dd><p>Multi Dimensional Quantization. If set to 1 then a 2nd stage LPC algorithm is
- applied after the first stage to finetune the coefficients. This is quite slow
- and slightly improves compression.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="opusenc"></a><a name="opus"></a>
- <h3 class="section">15.4 opus<span class="pull-right"><a class="anchor hidden-xs" href="#opus" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-opus" aria-hidden="true">TOC</a></span></h3>
- <p>Opus encoder.
- </p>
- <p>This is a native FFmpeg encoder for the Opus format. Currently, it’s in development and
- only implements the CELT part of the codec. Its quality is usually worse and at best
- is equal to the libopus encoder.
- </p>
- <a name="Options-14"></a>
- <h4 class="subsection">15.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-14" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-14" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set bit rate in bits/s. If unspecified it uses the number of channels and the layout
- to make a good guess.
- </p>
- </dd>
- <dt><samp class="option">opus_delay</samp></dt>
- <dd><p>Sets the maximum delay in milliseconds. Lower delays than 20ms will very quickly
- decrease quality.
- </p></dd>
- </dl>
- <a class="anchor" id="libfdk_002daac_002denc"></a><a name="libfdk_005faac"></a>
- <h3 class="section">15.5 libfdk_aac<span class="pull-right"><a class="anchor hidden-xs" href="#libfdk_005faac" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libfdk_005faac" aria-hidden="true">TOC</a></span></h3>
- <p>libfdk-aac AAC (Advanced Audio Coding) encoder wrapper.
- </p>
- <p>The libfdk-aac library is based on the Fraunhofer FDK AAC code from
- the Android project.
- </p>
- <p>Requires the presence of the libfdk-aac headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libfdk-aac</code>. The library is also incompatible with GPL,
- so if you allow the use of GPL, you should configure with
- <code class="code">--enable-gpl --enable-nonfree --enable-libfdk-aac</code>.
- </p>
- <p>This encoder has support for the AAC-HE profiles.
- </p>
- <p>VBR encoding, enabled through the <samp class="option">vbr</samp> or <samp class="option">flags
- +qscale</samp> options, is experimental and only works with some
- combinations of parameters.
- </p>
- <p>Support for encoding 7.1 audio is only available with libfdk-aac 0.1.3 or
- higher.
- </p>
- <p>For more information see the fdk-aac project at
- <a class="url" href="http://sourceforge.net/p/opencore-amr/fdk-aac/">http://sourceforge.net/p/opencore-amr/fdk-aac/</a>.
- </p>
- <a name="Options-15"></a>
- <h4 class="subsection">15.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-15" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-15" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are mapped on the shared FFmpeg codec options.
- </p>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set bit rate in bits/s. If the bitrate is not explicitly specified, it
- is automatically set to a suitable value depending on the selected
- profile.
- </p>
- <p>In case VBR mode is enabled the option is ignored.
- </p>
- </dd>
- <dt><samp class="option">ar</samp></dt>
- <dd><p>Set audio sampling rate (in Hz).
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of audio channels.
- </p>
- </dd>
- <dt><samp class="option">flags +qscale</samp></dt>
- <dd><p>Enable fixed quality, VBR (Variable Bit Rate) mode.
- Note that VBR is implicitly enabled when the <samp class="option">vbr</samp> value is
- positive.
- </p>
- </dd>
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set cutoff frequency. If not specified (or explicitly set to 0) it
- will use a value automatically computed by the library. Default value
- is 0.
- </p>
- </dd>
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Set audio profile.
- </p>
- <p>The following profiles are recognized:
- </p><dl class="table">
- <dt>‘<samp class="samp">aac_low</samp>’</dt>
- <dd><p>Low Complexity AAC (LC)
- </p>
- </dd>
- <dt>‘<samp class="samp">aac_he</samp>’</dt>
- <dd><p>High Efficiency AAC (HE-AAC)
- </p>
- </dd>
- <dt>‘<samp class="samp">aac_he_v2</samp>’</dt>
- <dd><p>High Efficiency AAC version 2 (HE-AACv2)
- </p>
- </dd>
- <dt>‘<samp class="samp">aac_ld</samp>’</dt>
- <dd><p>Low Delay AAC (LD)
- </p>
- </dd>
- <dt>‘<samp class="samp">aac_eld</samp>’</dt>
- <dd><p>Enhanced Low Delay AAC (ELD)
- </p></dd>
- </dl>
- <p>If not specified it is set to ‘<samp class="samp">aac_low</samp>’.
- </p></dd>
- </dl>
- <p>The following are private options of the libfdk_aac encoder.
- </p>
- <dl class="table">
- <dt><samp class="option">afterburner</samp></dt>
- <dd><p>Enable afterburner feature if set to 1, disabled if set to 0. This
- improves the quality but also the required processing power.
- </p>
- <p>Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">eld_sbr</samp></dt>
- <dd><p>Enable SBR (Spectral Band Replication) for ELD if set to 1, disabled
- if set to 0.
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">eld_v2</samp></dt>
- <dd><p>Enable ELDv2 (LD-MPS extension for ELD stereo signals) for ELDv2 if set to 1,
- disabled if set to 0.
- </p>
- <p>Note that option is available when fdk-aac version (AACENCODER_LIB_VL0.AACENCODER_LIB_VL1.AACENCODER_LIB_VL2) > (4.0.0).
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">signaling</samp></dt>
- <dd><p>Set SBR/PS signaling style.
- </p>
- <p>It can assume one of the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>choose signaling implicitly (explicit hierarchical by default,
- implicit if global header is disabled)
- </p>
- </dd>
- <dt>‘<samp class="samp">implicit</samp>’</dt>
- <dd><p>implicit backwards compatible signaling
- </p>
- </dd>
- <dt>‘<samp class="samp">explicit_sbr</samp>’</dt>
- <dd><p>explicit SBR, implicit PS signaling
- </p>
- </dd>
- <dt>‘<samp class="samp">explicit_hierarchical</samp>’</dt>
- <dd><p>explicit hierarchical signaling
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">default</samp>’.
- </p>
- </dd>
- <dt><samp class="option">latm</samp></dt>
- <dd><p>Output LATM/LOAS encapsulated data if set to 1, disabled if set to 0.
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">header_period</samp></dt>
- <dd><p>Set StreamMuxConfig and PCE repetition period (in frames) for sending
- in-band configuration buffers within LATM/LOAS transport layer.
- </p>
- <p>Must be a 16-bits non-negative integer.
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">vbr</samp></dt>
- <dd><p>Set VBR mode, from 1 to 5. 1 is lowest quality (though still pretty
- good) and 5 is highest quality. A value of 0 will disable VBR, and CBR
- (Constant Bit Rate) is enabled.
- </p>
- <p>Currently only the ‘<samp class="samp">aac_low</samp>’ profile supports VBR encoding.
- </p>
- <p>VBR modes 1-5 correspond to roughly the following average bit rates:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">1</samp>’</dt>
- <dd><p>32 kbps/channel
- </p></dd>
- <dt>‘<samp class="samp">2</samp>’</dt>
- <dd><p>40 kbps/channel
- </p></dd>
- <dt>‘<samp class="samp">3</samp>’</dt>
- <dd><p>48-56 kbps/channel
- </p></dd>
- <dt>‘<samp class="samp">4</samp>’</dt>
- <dd><p>64 kbps/channel
- </p></dd>
- <dt>‘<samp class="samp">5</samp>’</dt>
- <dd><p>about 80-96 kbps/channel
- </p></dd>
- </dl>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">frame_length</samp></dt>
- <dd><p>Set the audio frame length in samples. Default value is the internal
- default of the library. Refer to the library’s documentation for information
- about supported values.
- </p></dd>
- </dl>
- <a name="Examples-4"></a>
- <h4 class="subsection">15.5.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-4" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> to convert an audio file to VBR AAC in an M4A (MP4)
- container:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.wav -codec:a libfdk_aac -vbr 3 output.m4a
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to convert an audio file to CBR 64k kbps AAC, using the
- High-Efficiency AAC profile:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.wav -c:a libfdk_aac -profile:a aac_he -b:a 64k output.m4a
- </pre></div>
- </li></ul>
- <a class="anchor" id="liblc3_002denc"></a><a name="liblc3"></a>
- <h3 class="section">15.6 liblc3<span class="pull-right"><a class="anchor hidden-xs" href="#liblc3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-liblc3" aria-hidden="true">TOC</a></span></h3>
- <p>liblc3 LC3 (Low Complexity Communication Codec) encoder wrapper.
- </p>
- <p>Requires the presence of the liblc3 headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-liblc3</code>.
- </p>
- <p>This encoder has support for the Bluetooth SIG LC3 codec for the LE Audio
- protocol, and the following features of LC3plus:
- </p><ul class="itemize mark-bullet">
- <li>Frame duration of 2.5 and 5ms.
- </li><li>High-Resolution mode, 48 KHz, and 96 kHz sampling rates.
- </li></ul>
- <p>For more information see the liblc3 project at
- <a class="url" href="https://github.com/google/liblc3">https://github.com/google/liblc3</a>.
- </p>
- <a name="Options-16"></a>
- <h4 class="subsection">15.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-16" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-16" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are mapped on the shared FFmpeg codec options.
- </p>
- <dl class="table">
- <dt><samp class="option">b <var class="var">bitrate</var></samp></dt>
- <dd><p>Set the bit rate in bits/s. This will determine the fixed size of the encoded
- frames, for a selected frame duration.
- </p>
- </dd>
- <dt><samp class="option">ar <var class="var">frequency</var></samp></dt>
- <dd><p>Set the audio sampling rate (in Hz).
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of audio channels.
- </p>
- </dd>
- <dt><samp class="option">frame_duration</samp></dt>
- <dd><p>Set the audio frame duration in milliseconds. Default value is 10ms.
- Allowed frame durations are 2.5ms, 5ms, 7.5ms and 10ms.
- LC3 (Bluetooth LE Audio), allows 7.5ms and 10ms; and LC3plus 2.5ms, 5ms
- and 10ms.
- </p>
- <p>The 10ms frame duration is available in LC3 and LC3 plus standard.
- In this mode, the produced bitstream can be referenced either as LC3 or LC3plus.
- </p>
- </dd>
- <dt><samp class="option">high_resolution <var class="var">boolean</var></samp></dt>
- <dd><p>Enable the high-resolution mode if set to 1. The high-resolution mode is
- available with all LC3plus frame durations and for a sampling rate of 48 KHz,
- and 96 KHz.
- </p>
- <p>The encoder automatically turns off this mode at lower sampling rates and
- activates it at 96 KHz.
- </p>
- <p>This mode should be preferred at high bitrates. In this mode, the audio
- bandwidth is always up to the Nyquist frequency, compared to LC3 at 48 KHz,
- which limits the bandwidth to 20 KHz.
- </p></dd>
- </dl>
- <a class="anchor" id="libmp3lame"></a><a name="libmp3lame-1"></a>
- <h3 class="section">15.7 libmp3lame<span class="pull-right"><a class="anchor hidden-xs" href="#libmp3lame-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libmp3lame-1" aria-hidden="true">TOC</a></span></h3>
- <p>LAME (Lame Ain’t an MP3 Encoder) MP3 encoder wrapper.
- </p>
- <p>Requires the presence of the libmp3lame headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libmp3lame</code>.
- </p>
- <p>See <a class="ref" href="#libshine">libshine</a> for a fixed-point MP3 encoder, although with a
- lower quality.
- </p>
- <a name="Options-17"></a>
- <h4 class="subsection">15.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-17" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-17" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libmp3lame wrapper. The
- <code class="command">lame</code>-equivalent of the options are listed in parentheses.
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">-b</em>)</samp></dt>
- <dd><p>Set bitrate expressed in bits/s for CBR or ABR. LAME <code class="code">bitrate</code> is
- expressed in kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">q (<em class="emph">-V</em>)</samp></dt>
- <dd><p>Set constant quality setting for VBR. This option is valid only
- using the <code class="command">ffmpeg</code> command-line tool. For library interface
- users, use <samp class="option">global_quality</samp>.
- </p>
- </dd>
- <dt><samp class="option">compression_level (<em class="emph">-q</em>)</samp></dt>
- <dd><p>Set algorithm quality. Valid arguments are integers in the 0-9 range,
- with 0 meaning highest quality but slowest, and 9 meaning fastest
- while producing the worst quality.
- </p>
- </dd>
- <dt><samp class="option">cutoff (<em class="emph">--lowpass</em>)</samp></dt>
- <dd><p>Set lowpass cutoff frequency. If unspecified, the encoder dynamically
- adjusts the cutoff.
- </p>
- </dd>
- <dt><samp class="option">reservoir</samp></dt>
- <dd><p>Enable use of bit reservoir when set to 1. Default value is 1. LAME
- has this enabled by default, but can be overridden by use
- <samp class="option">--nores</samp> option.
- </p>
- </dd>
- <dt><samp class="option">joint_stereo (<em class="emph">-m j</em>)</samp></dt>
- <dd><p>Enable the encoder to use (on a frame by frame basis) either L/R
- stereo or mid/side stereo. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">abr (<em class="emph">--abr</em>)</samp></dt>
- <dd><p>Enable the encoder to use ABR when set to 1. The <code class="command">lame</code>
- <samp class="option">--abr</samp> sets the target bitrate, while this options only
- tells FFmpeg to use ABR still relies on <samp class="option">b</samp> to set bitrate.
- </p>
- </dd>
- <dt><samp class="option">copyright (<em class="emph">-c</em>)</samp></dt>
- <dd><p>Set MPEG audio copyright flag when set to 1. The default value is 0
- (disabled).
- </p>
- </dd>
- <dt><samp class="option">original (<em class="emph">-o</em>)</samp></dt>
- <dd><p>Set MPEG audio original flag when set to 1. The default value is 1
- (enabled).
- </p></dd>
- </dl>
- <a name="libopencore_002damrnb-1"></a>
- <h3 class="section">15.8 libopencore-amrnb<span class="pull-right"><a class="anchor hidden-xs" href="#libopencore_002damrnb-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopencore_002damrnb-1" aria-hidden="true">TOC</a></span></h3>
- <p>OpenCORE Adaptive Multi-Rate Narrowband encoder.
- </p>
- <p>Requires the presence of the libopencore-amrnb headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libopencore-amrnb --enable-version3</code>.
- </p>
- <p>This is a mono-only encoder. Officially it only supports 8000Hz sample rate,
- but you can override it by setting <samp class="option">strict</samp> to ‘<samp class="samp">unofficial</samp>’ or
- lower.
- </p>
- <a name="Options-18"></a>
- <h4 class="subsection">15.8.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-18" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-18" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set bitrate in bits per second. Only the following bitrates are supported,
- otherwise libavcodec will round to the nearest valid bitrate.
- </p>
- <dl class="table">
- <dt><samp class="option">4750</samp></dt>
- <dt><samp class="option">5150</samp></dt>
- <dt><samp class="option">5900</samp></dt>
- <dt><samp class="option">6700</samp></dt>
- <dt><samp class="option">7400</samp></dt>
- <dt><samp class="option">7950</samp></dt>
- <dt><samp class="option">10200</samp></dt>
- <dt><samp class="option">12200</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">dtx</samp></dt>
- <dd><p>Allow discontinuous transmission (generate comfort noise) when set to 1. The
- default value is 0 (disabled).
- </p>
- </dd>
- </dl>
- <a name="libopus-1"></a>
- <h3 class="section">15.9 libopus<span class="pull-right"><a class="anchor hidden-xs" href="#libopus-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopus-1" aria-hidden="true">TOC</a></span></h3>
- <p>libopus Opus Interactive Audio Codec encoder wrapper.
- </p>
- <p>Requires the presence of the libopus headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libopus</code>.
- </p>
- <a name="Option-Mapping"></a>
- <h4 class="subsection">15.9.1 Option Mapping<span class="pull-right"><a class="anchor hidden-xs" href="#Option-Mapping" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Option-Mapping" aria-hidden="true">TOC</a></span></h4>
- <p>Most libopus options are modelled after the <code class="command">opusenc</code> utility from
- opus-tools. The following is an option mapping chart describing options
- supported by the libopus wrapper, and their <code class="command">opusenc</code>-equivalent
- in parentheses.
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">bitrate</em>)</samp></dt>
- <dd><p>Set the bit rate in bits/s. FFmpeg’s <samp class="option">b</samp> option is
- expressed in bits/s, while <code class="command">opusenc</code>’s <samp class="option">bitrate</samp> in
- kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">vbr (<em class="emph">vbr</em>, <em class="emph">hard-cbr</em>, and <em class="emph">cvbr</em>)</samp></dt>
- <dd><p>Set VBR mode. The FFmpeg <samp class="option">vbr</samp> option has the following
- valid arguments, with the <code class="command">opusenc</code> equivalent options
- in parentheses:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">off (<em class="emph">hard-cbr</em>)</samp>’</dt>
- <dd><p>Use constant bit rate encoding.
- </p>
- </dd>
- <dt>‘<samp class="samp">on (<em class="emph">vbr</em>)</samp>’</dt>
- <dd><p>Use variable bit rate encoding (the default).
- </p>
- </dd>
- <dt>‘<samp class="samp">constrained (<em class="emph">cvbr</em>)</samp>’</dt>
- <dd><p>Use constrained variable bit rate encoding.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">compression_level (<em class="emph">comp</em>)</samp></dt>
- <dd><p>Set encoding algorithm complexity. Valid options are integers in
- the 0-10 range. 0 gives the fastest encodes but lower quality, while 10
- gives the highest quality but slowest encoding. The default is 10.
- </p>
- </dd>
- <dt><samp class="option">frame_duration (<em class="emph">framesize</em>)</samp></dt>
- <dd><p>Set maximum frame size, or duration of a frame in milliseconds. The
- argument must be exactly the following: 2.5, 5, 10, 20, 40, 60. Smaller
- frame sizes achieve lower latency but less quality at a given bitrate.
- Sizes greater than 20ms are only interesting at fairly low bitrates.
- The default is 20ms.
- </p>
- </dd>
- <dt><samp class="option">packet_loss (<em class="emph">expect-loss</em>)</samp></dt>
- <dd><p>Set expected packet loss percentage. The default is 0.
- </p>
- </dd>
- <dt><samp class="option">fec (<em class="emph">n/a</em>)</samp></dt>
- <dd><p>Enable inband forward error correction. <samp class="option">packet_loss</samp> must be non-zero
- to take advantage - frequency of FEC ’side-data’ is proportional to expected packet loss.
- Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">application (N.A.)</samp></dt>
- <dd><p>Set intended application type. Valid options are listed below:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">voip</samp>’</dt>
- <dd><p>Favor improved speech intelligibility.
- </p></dd>
- <dt>‘<samp class="samp">audio</samp>’</dt>
- <dd><p>Favor faithfulness to the input (the default).
- </p></dd>
- <dt>‘<samp class="samp">lowdelay</samp>’</dt>
- <dd><p>Restrict to only the lowest delay modes by disabling voice-optimized
- modes.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">cutoff (N.A.)</samp></dt>
- <dd><p>Set cutoff bandwidth in Hz. The argument must be exactly one of the
- following: 4000, 6000, 8000, 12000, or 20000, corresponding to
- narrowband, mediumband, wideband, super wideband, and fullband
- respectively. The default is 0 (cutoff disabled). Note that libopus
- forces a wideband cutoff for bitrates < 15 kbps, unless CELT-only
- (<samp class="option">application</samp> set to ‘<samp class="samp">lowdelay</samp>’) mode is used.
- </p>
- </dd>
- <dt><samp class="option">mapping_family (<em class="emph">mapping_family</em>)</samp></dt>
- <dd><p>Set channel mapping family to be used by the encoder. The default value of -1
- uses mapping family 0 for mono and stereo inputs, and mapping family 1
- otherwise. The default also disables the surround masking and LFE bandwidth
- optimizations in libopus, and requires that the input contains 8 channels or
- fewer.
- </p>
- <p>Other values include 0 for mono and stereo, 1 for surround sound with masking
- and LFE bandwidth optimizations, and 255 for independent streams with an
- unspecified channel layout.
- </p>
- </dd>
- <dt><samp class="option">apply_phase_inv (N.A.) (requires libopus >= 1.2)</samp></dt>
- <dd><p>If set to 0, disables the use of phase inversion for intensity stereo,
- improving the quality of mono downmixes, but slightly reducing normal stereo
- quality. The default is 1 (phase inversion enabled).
- </p>
- </dd>
- </dl>
- <a class="anchor" id="libshine"></a><a name="libshine-1"></a>
- <h3 class="section">15.10 libshine<span class="pull-right"><a class="anchor hidden-xs" href="#libshine-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libshine-1" aria-hidden="true">TOC</a></span></h3>
- <p>Shine Fixed-Point MP3 encoder wrapper.
- </p>
- <p>Shine is a fixed-point MP3 encoder. It has a far better performance on
- platforms without an FPU, e.g. armel CPUs, and some phones and tablets.
- However, as it is more targeted on performance than quality, it is not on par
- with LAME and other production-grade encoders quality-wise. Also, according to
- the project’s homepage, this encoder may not be free of bugs as the code was
- written a long time ago and the project was dead for at least 5 years.
- </p>
- <p>This encoder only supports stereo and mono input. This is also CBR-only.
- </p>
- <p>The original project (last updated in early 2007) is at
- <a class="url" href="http://sourceforge.net/projects/libshine-fxp/">http://sourceforge.net/projects/libshine-fxp/</a>. We only support the
- updated fork by the Savonet/Liquidsoap project at <a class="url" href="https://github.com/savonet/shine">https://github.com/savonet/shine</a>.
- </p>
- <p>Requires the presence of the libshine headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libshine</code>.
- </p>
- <p>See also <a class="ref" href="#libmp3lame">libmp3lame</a>.
- </p>
- <a name="Options-19"></a>
- <h4 class="subsection">15.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-19" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-19" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libshine wrapper. The
- <code class="command">shineenc</code>-equivalent of the options are listed in parentheses.
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">-b</em>)</samp></dt>
- <dd><p>Set bitrate expressed in bits/s for CBR. <code class="command">shineenc</code> <samp class="option">-b</samp> option
- is expressed in kilobits/s.
- </p>
- </dd>
- </dl>
- <a name="libtwolame"></a>
- <h3 class="section">15.11 libtwolame<span class="pull-right"><a class="anchor hidden-xs" href="#libtwolame" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libtwolame" aria-hidden="true">TOC</a></span></h3>
- <p>TwoLAME MP2 encoder wrapper.
- </p>
- <p>Requires the presence of the libtwolame headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libtwolame</code>.
- </p>
- <a name="Options-20"></a>
- <h4 class="subsection">15.11.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-20" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-20" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libtwolame wrapper. The
- <code class="command">twolame</code>-equivalent options follow the FFmpeg ones and are in
- parentheses.
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">-b</em>)</samp></dt>
- <dd><p>Set bitrate expressed in bits/s for CBR. <code class="command">twolame</code> <samp class="option">b</samp>
- option is expressed in kilobits/s. Default value is 128k.
- </p>
- </dd>
- <dt><samp class="option">q (<em class="emph">-V</em>)</samp></dt>
- <dd><p>Set quality for experimental VBR support. Maximum value range is
- from -50 to 50, useful range is from -10 to 10. The higher the
- value, the better the quality. This option is valid only using the
- <code class="command">ffmpeg</code> command-line tool. For library interface users,
- use <samp class="option">global_quality</samp>.
- </p>
- </dd>
- <dt><samp class="option">mode (<em class="emph">--mode</em>)</samp></dt>
- <dd><p>Set the mode of the resulting audio. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Choose mode automatically based on the input. This is the default.
- </p></dd>
- <dt>‘<samp class="samp">stereo</samp>’</dt>
- <dd><p>Stereo
- </p></dd>
- <dt>‘<samp class="samp">joint_stereo</samp>’</dt>
- <dd><p>Joint stereo
- </p></dd>
- <dt>‘<samp class="samp">dual_channel</samp>’</dt>
- <dd><p>Dual channel
- </p></dd>
- <dt>‘<samp class="samp">mono</samp>’</dt>
- <dd><p>Mono
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">psymodel (<em class="emph">--psyc-mode</em>)</samp></dt>
- <dd><p>Set psychoacoustic model to use in encoding. The argument must be
- an integer between -1 and 4, inclusive. The higher the value, the
- better the quality. The default value is 3.
- </p>
- </dd>
- <dt><samp class="option">energy_levels (<em class="emph">--energy</em>)</samp></dt>
- <dd><p>Enable energy levels extensions when set to 1. The default value is
- 0 (disabled).
- </p>
- </dd>
- <dt><samp class="option">error_protection (<em class="emph">--protect</em>)</samp></dt>
- <dd><p>Enable CRC error protection when set to 1. The default value is 0
- (disabled).
- </p>
- </dd>
- <dt><samp class="option">copyright (<em class="emph">--copyright</em>)</samp></dt>
- <dd><p>Set MPEG audio copyright flag when set to 1. The default value is 0
- (disabled).
- </p>
- </dd>
- <dt><samp class="option">original (<em class="emph">--original</em>)</samp></dt>
- <dd><p>Set MPEG audio original flag when set to 1. The default value is 0
- (disabled).
- </p>
- </dd>
- </dl>
- <a name="libvo_002damrwbenc"></a>
- <h3 class="section">15.12 libvo-amrwbenc<span class="pull-right"><a class="anchor hidden-xs" href="#libvo_002damrwbenc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvo_002damrwbenc" aria-hidden="true">TOC</a></span></h3>
- <p>VisualOn Adaptive Multi-Rate Wideband encoder.
- </p>
- <p>Requires the presence of the libvo-amrwbenc headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libvo-amrwbenc --enable-version3</code>.
- </p>
- <p>This is a mono-only encoder. Officially it only supports 16000Hz sample
- rate, but you can override it by setting <samp class="option">strict</samp> to
- ‘<samp class="samp">unofficial</samp>’ or lower.
- </p>
- <a name="Options-21"></a>
- <h4 class="subsection">15.12.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-21" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-21" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set bitrate in bits/s. Only the following bitrates are supported, otherwise
- libavcodec will round to the nearest valid bitrate.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">6600</samp>’</dt>
- <dt>‘<samp class="samp">8850</samp>’</dt>
- <dt>‘<samp class="samp">12650</samp>’</dt>
- <dt>‘<samp class="samp">14250</samp>’</dt>
- <dt>‘<samp class="samp">15850</samp>’</dt>
- <dt>‘<samp class="samp">18250</samp>’</dt>
- <dt>‘<samp class="samp">19850</samp>’</dt>
- <dt>‘<samp class="samp">23050</samp>’</dt>
- <dt>‘<samp class="samp">23850</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">dtx</samp></dt>
- <dd><p>Allow discontinuous transmission (generate comfort noise) when set to 1. The
- default value is 0 (disabled).
- </p>
- </dd>
- </dl>
- <a name="libvorbis"></a>
- <h3 class="section">15.13 libvorbis<span class="pull-right"><a class="anchor hidden-xs" href="#libvorbis" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvorbis" aria-hidden="true">TOC</a></span></h3>
- <p>libvorbis encoder wrapper.
- </p>
- <p>Requires the presence of the libvorbisenc headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libvorbis</code>.
- </p>
- <a name="Options-22"></a>
- <h4 class="subsection">15.13.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-22" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-22" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libvorbis wrapper. The
- <code class="command">oggenc</code>-equivalent of the options are listed in parentheses.
- </p>
- <p>To get a more accurate and extensive documentation of the libvorbis
- options, consult the libvorbisenc’s and <code class="command">oggenc</code>’s documentations.
- See <a class="url" href="http://xiph.org/vorbis/">http://xiph.org/vorbis/</a>,
- <a class="url" href="http://wiki.xiph.org/Vorbis-tools">http://wiki.xiph.org/Vorbis-tools</a>, and oggenc(1).
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">-b</em>)</samp></dt>
- <dd><p>Set bitrate expressed in bits/s for ABR. <code class="command">oggenc</code> <samp class="option">-b</samp> is
- expressed in kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">q (<em class="emph">-q</em>)</samp></dt>
- <dd><p>Set constant quality setting for VBR. The value should be a float
- number in the range of -1.0 to 10.0. The higher the value, the better
- the quality. The default value is ‘<samp class="samp">3.0</samp>’.
- </p>
- <p>This option is valid only using the <code class="command">ffmpeg</code> command-line tool.
- For library interface users, use <samp class="option">global_quality</samp>.
- </p>
- </dd>
- <dt><samp class="option">cutoff (<em class="emph">--advanced-encode-option lowpass_frequency=N</em>)</samp></dt>
- <dd><p>Set cutoff bandwidth in Hz, a value of 0 disables cutoff. <code class="command">oggenc</code>’s
- related option is expressed in kHz. The default value is ‘<samp class="samp">0</samp>’ (cutoff
- disabled).
- </p>
- </dd>
- <dt><samp class="option">minrate (<em class="emph">-m</em>)</samp></dt>
- <dd><p>Set minimum bitrate expressed in bits/s. <code class="command">oggenc</code> <samp class="option">-m</samp> is
- expressed in kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">maxrate (<em class="emph">-M</em>)</samp></dt>
- <dd><p>Set maximum bitrate expressed in bits/s. <code class="command">oggenc</code> <samp class="option">-M</samp> is
- expressed in kilobits/s. This only has effect on ABR mode.
- </p>
- </dd>
- <dt><samp class="option">iblock (<em class="emph">--advanced-encode-option impulse_noisetune=N</em>)</samp></dt>
- <dd><p>Set noise floor bias for impulse blocks. The value is a float number from
- -15.0 to 0.0. A negative bias instructs the encoder to pay special attention
- to the crispness of transients in the encoded audio. The tradeoff for better
- transient response is a higher bitrate.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="mjpegenc"></a><a name="mjpeg"></a>
- <h3 class="section">15.14 mjpeg<span class="pull-right"><a class="anchor hidden-xs" href="#mjpeg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mjpeg" aria-hidden="true">TOC</a></span></h3>
- <p>Motion JPEG encoder.
- </p>
- <a name="Options-23"></a>
- <h4 class="subsection">15.14.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-23" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-23" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">huffman</samp></dt>
- <dd><p>Set the huffman encoding strategy. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>Use the default huffman tables. This is the default strategy.
- </p>
- </dd>
- <dt>‘<samp class="samp">optimal</samp>’</dt>
- <dd><p>Compute and use optimal huffman tables.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="wavpackenc"></a><a name="wavpack"></a>
- <h3 class="section">15.15 wavpack<span class="pull-right"><a class="anchor hidden-xs" href="#wavpack" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-wavpack" aria-hidden="true">TOC</a></span></h3>
- <p>WavPack lossless audio encoder.
- </p>
- <a name="Options-24"></a>
- <h4 class="subsection">15.15.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-24" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-24" aria-hidden="true">TOC</a></span></h4>
- <p>The equivalent options for <code class="command">wavpack</code> command line utility are listed in
- parentheses.
- </p>
- <a name="Shared-options"></a>
- <h4 class="subsubsection">15.15.1.1 Shared options<span class="pull-right"><a class="anchor hidden-xs" href="#Shared-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Shared-options" aria-hidden="true">TOC</a></span></h4>
- <p>The following shared options are effective for this encoder. Only special notes
- about this particular encoder will be documented here. For the general meaning
- of the options, see <a class="ref" href="#codec_002doptions">the Codec Options chapter</a>.
- </p>
- <dl class="table">
- <dt><samp class="option">frame_size (<em class="emph">--blocksize</em>)</samp></dt>
- <dd><p>For this encoder, the range for this option is between 128 and 131072. Default
- is automatically decided based on sample rate and number of channel.
- </p>
- <p>For the complete formula of calculating default, see
- <samp class="file">libavcodec/wavpackenc.c</samp>.
- </p>
- </dd>
- <dt><samp class="option">compression_level (<em class="emph">-f</em>, <em class="emph">-h</em>, <em class="emph">-hh</em>, and <em class="emph">-x</em>)</samp></dt>
- </dl>
- <a name="Private-options"></a>
- <h4 class="subsubsection">15.15.1.2 Private options<span class="pull-right"><a class="anchor hidden-xs" href="#Private-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Private-options" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">joint_stereo (<em class="emph">-j</em>)</samp></dt>
- <dd><p>Set whether to enable joint stereo. Valid values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">on (<em class="emph">1</em>)</samp>’</dt>
- <dd><p>Force mid/side audio encoding.
- </p></dd>
- <dt>‘<samp class="samp">off (<em class="emph">0</em>)</samp>’</dt>
- <dd><p>Force left/right audio encoding.
- </p></dd>
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Let the encoder decide automatically.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">optimize_mono</samp></dt>
- <dd><p>Set whether to enable optimization for mono. This option is only effective for
- non-mono streams. Available values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">on</samp>’</dt>
- <dd><p>enabled
- </p></dd>
- <dt>‘<samp class="samp">off</samp>’</dt>
- <dd><p>disabled
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Video-Encoders"></a>
- <h2 class="chapter">16 Video Encoders<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Encoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Encoders" aria-hidden="true">TOC</a></span></h2>
- <p>A description of some of the currently available video encoders
- follows.
- </p>
- <a name="a64_005fmulti_002c-a64_005fmulti5"></a>
- <h3 class="section">16.1 a64_multi, a64_multi5<span class="pull-right"><a class="anchor hidden-xs" href="#a64_005fmulti_002c-a64_005fmulti5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-a64_005fmulti_002c-a64_005fmulti5" aria-hidden="true">TOC</a></span></h3>
- <p>A64 / Commodore 64 multicolor charset encoder. <code class="code">a64_multi5</code> is extended with 5th color (colram).
- </p>
- <a name="Cinepak"></a>
- <h3 class="section">16.2 Cinepak<span class="pull-right"><a class="anchor hidden-xs" href="#Cinepak" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Cinepak" aria-hidden="true">TOC</a></span></h3>
- <p>Cinepak aka CVID encoder.
- Compatible with Windows 3.1 and vintage MacOS.
- </p>
- <a name="Options-25"></a>
- <h4 class="subsection">16.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-25" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-25" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">g <var class="var">integer</var></samp></dt>
- <dd><p>Keyframe interval.
- A keyframe is inserted at least every <code class="code">-g</code> frames, sometimes sooner.
- </p>
- </dd>
- <dt><samp class="option">q:v <var class="var">integer</var></samp></dt>
- <dd><p>Quality factor. Lower is better. Higher gives lower bitrate.
- The following table lists bitrates when encoding akiyo_cif.y4m for various values of <code class="code">-q:v</code> with <code class="code">-g 100</code>:
- </p>
- <dl class="table">
- <dt><samp class="option"><code class="code">-q:v 1</code> 1918 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 2</code> 1735 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 4</code> 1500 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 10</code> 1041 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 20</code> 826 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 40</code> 553 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 100</code> 394 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 200</code> 312 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 400</code> 266 kb/s</samp></dt>
- <dt><samp class="option"><code class="code">-q:v 1000</code> 237 kb/s</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">max_extra_cb_iterations <var class="var">integer</var></samp></dt>
- <dd><p>Max extra codebook recalculation passes, more is better and slower.
- </p>
- </dd>
- <dt><samp class="option">skip_empty_cb <var class="var">boolean</var></samp></dt>
- <dd><p>Avoid wasting bytes, ignore vintage MacOS decoder.
- </p>
- </dd>
- <dt><samp class="option">max_strips <var class="var">integer</var></samp></dt>
- <dt><samp class="option">min_strips <var class="var">integer</var></samp></dt>
- <dd><p>The minimum and maximum number of strips to use.
- Wider range sometimes improves quality.
- More strips is generally better quality but costs more bits.
- Fewer strips tend to yield more keyframes.
- Vintage compatible is 1..3.
- </p>
- </dd>
- <dt><samp class="option">strip_number_adaptivity <var class="var">integer</var></samp></dt>
- <dd><p>How much number of strips is allowed to change between frames.
- Higher is better but slower.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="ffv1"></a><a name="ffv1-1"></a>
- <h3 class="section">16.3 ffv1<span class="pull-right"><a class="anchor hidden-xs" href="#ffv1-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ffv1-1" aria-hidden="true">TOC</a></span></h3>
- <p>FFv1 Encoder
- </p>
- <a name="Options-26"></a>
- <h4 class="subsection">16.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-26" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-26" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by FFmpeg’s FFv1 encoder.
- </p>
- <dl class="table">
- <dt><samp class="option">context</samp></dt>
- <dd><p>Sets the context size, 0 (default) is small, 1 is big.
- </p>
- </dd>
- <dt><samp class="option">coder</samp></dt>
- <dd><p>Set the coder,
- </p><dl class="table">
- <dt>‘<samp class="samp">rice</samp>’</dt>
- <dd><p>Golomb rice coder
- </p></dd>
- <dt>‘<samp class="samp">range_def</samp>’</dt>
- <dd><p>Range coder with default table
- </p></dd>
- <dt>‘<samp class="samp">range_tab</samp>’</dt>
- <dd><p>Range coder with custom table
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">slicecrc</samp></dt>
- <dd><p>-1 (default, automatic), 1 use crc with zero initial and final state, 2 use crc with non zero initial and final state
- </p>
- </dd>
- <dt><samp class="option">qtable</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>default, automatic
- </p></dd>
- <dt>‘<samp class="samp">8bit</samp>’</dt>
- <dd><p>use 8bit default
- </p></dd>
- <dt>‘<samp class="samp">greater8bit</samp>’</dt>
- <dd><p>use >8bit default
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">remap_optimizer</samp></dt>
- <dd><p>0 - 5, default 3, how much effort the encoder puts into optimizing the remap table.
- </p>
- </dd>
- </dl>
- <a name="GIF"></a>
- <h3 class="section">16.4 GIF<span class="pull-right"><a class="anchor hidden-xs" href="#GIF" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-GIF" aria-hidden="true">TOC</a></span></h3>
- <p>GIF image/animation encoder.
- </p>
- <a name="Options-27"></a>
- <h4 class="subsection">16.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-27" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-27" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">gifflags <var class="var">integer</var></samp></dt>
- <dd><p>Sets the flags used for GIF encoding.
- </p>
- <dl class="table">
- <dt><samp class="option">offsetting</samp></dt>
- <dd><p>Enables picture offsetting.
- </p>
- <p>Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">transdiff</samp></dt>
- <dd><p>Enables transparency detection between frames.
- </p>
- <p>Default is enabled.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">gifimage <var class="var">integer</var></samp></dt>
- <dd><p>Enables encoding one full GIF image per frame, rather than an animated GIF.
- </p>
- <p>Default value is <samp class="option">0</samp>.
- </p>
- </dd>
- <dt><samp class="option">global_palette <var class="var">integer</var></samp></dt>
- <dd><p>Writes a palette to the global GIF header where feasible.
- </p>
- <p>If disabled, every frame will always have a palette written, even if there
- is a global palette supplied.
- </p>
- <p>Default value is <samp class="option">1</samp>.
- </p>
- </dd>
- </dl>
- <a name="Hap"></a>
- <h3 class="section">16.5 Hap<span class="pull-right"><a class="anchor hidden-xs" href="#Hap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Hap" aria-hidden="true">TOC</a></span></h3>
- <p>Vidvox Hap video encoder.
- </p>
- <a name="Options-28"></a>
- <h4 class="subsection">16.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-28" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-28" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">format <var class="var">integer</var></samp></dt>
- <dd><p>Specifies the Hap format to encode.
- </p>
- <dl class="table">
- <dt><samp class="option">hap</samp></dt>
- <dt><samp class="option">hap_alpha</samp></dt>
- <dt><samp class="option">hap_q</samp></dt>
- </dl>
- <p>Default value is <samp class="option">hap</samp>.
- </p>
- </dd>
- <dt><samp class="option">chunks <var class="var">integer</var></samp></dt>
- <dd><p>Specifies the number of chunks to split frames into, between 1 and 64. This
- permits multithreaded decoding of large frames, potentially at the cost of
- data-rate. The encoder may modify this value to divide frames evenly.
- </p>
- <p>Default value is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">compressor <var class="var">integer</var></samp></dt>
- <dd><p>Specifies the second-stage compressor to use. If set to <samp class="option">none</samp>,
- <samp class="option">chunks</samp> will be limited to 1, as chunked uncompressed frames offer no
- benefit.
- </p>
- <dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dt><samp class="option">snappy</samp></dt>
- </dl>
- <p>Default value is <samp class="option">snappy</samp>.
- </p>
- </dd>
- </dl>
- <a name="jpeg2000"></a>
- <h3 class="section">16.6 jpeg2000<span class="pull-right"><a class="anchor hidden-xs" href="#jpeg2000" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-jpeg2000" aria-hidden="true">TOC</a></span></h3>
- <p>The native jpeg 2000 encoder is lossy by default, the <code class="code">-q:v</code>
- option can be used to set the encoding quality. Lossless encoding
- can be selected with <code class="code">-pred 1</code>.
- </p>
- <a name="Options-29"></a>
- <h4 class="subsection">16.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-29" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-29" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">format <var class="var">integer</var></samp></dt>
- <dd><p>Can be set to either <code class="code">j2k</code> or <code class="code">jp2</code> (the default) that
- makes it possible to store non-rgb pix_fmts.
- </p>
- </dd>
- <dt><samp class="option">tile_width <var class="var">integer</var></samp></dt>
- <dd><p>Sets tile width. Range is 1 to 1073741824. Default is 256.
- </p>
- </dd>
- <dt><samp class="option">tile_height <var class="var">integer</var></samp></dt>
- <dd><p>Sets tile height. Range is 1 to 1073741824. Default is 256.
- </p>
- </dd>
- <dt><samp class="option">pred <var class="var">integer</var></samp></dt>
- <dd><p>Allows setting the discrete wavelet transform (DWT) type
- </p><dl class="table">
- <dt><samp class="option">dwt97int (Lossy)</samp></dt>
- <dt><samp class="option">dwt53 (Lossless)</samp></dt>
- </dl>
- <p>Default is <code class="code">dwt97int</code>
- </p>
- </dd>
- <dt><samp class="option">sop <var class="var">boolean</var></samp></dt>
- <dd><p>Enable this to add SOP marker at the start of each packet. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">eph <var class="var">boolean</var></samp></dt>
- <dd><p>Enable this to add EPH marker at the end of each packet header. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">prog <var class="var">integer</var></samp></dt>
- <dd><p>Sets the progression order to be used by the encoder.
- Possible values are:
- </p><dl class="table">
- <dt><samp class="option">lrcp</samp></dt>
- <dt><samp class="option">rlcp</samp></dt>
- <dt><samp class="option">rpcl</samp></dt>
- <dt><samp class="option">pcrl</samp></dt>
- <dt><samp class="option">cprl</samp></dt>
- </dl>
- <p>Set to <code class="code">lrcp</code> by default.
- </p>
- </dd>
- <dt><samp class="option">layer_rates <var class="var">string</var></samp></dt>
- <dd><p>By default, when this option is not used, compression is done using the quality metric.
- This option allows for compression using compression ratio. The compression ratio for each
- level could be specified. The compression ratio of a layer <code class="code">l</code> species the what ratio of
- total file size is contained in the first <code class="code">l</code> layers.
- </p>
- <p>Example usage:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.bmp -c:v jpeg2000 -layer_rates "100,10,1" output.j2k
- </pre></div>
- <p>This would compress the image to contain 3 layers, where the data contained in the
- first layer would be compressed by 1000 times, compressed by 100 in the first two layers,
- and shall contain all data while using all 3 layers.
- </p>
- </dd>
- </dl>
- <a name="librav1e"></a>
- <h3 class="section">16.7 librav1e<span class="pull-right"><a class="anchor hidden-xs" href="#librav1e" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-librav1e" aria-hidden="true">TOC</a></span></h3>
- <p>rav1e AV1 encoder wrapper.
- </p>
- <p>Requires the presence of the rav1e headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-librav1e</code>.
- </p>
- <a name="Options-30"></a>
- <h4 class="subsection">16.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-30" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-30" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">qmax</samp></dt>
- <dd><p>Sets the maximum quantizer to use when using bitrate mode.
- </p>
- </dd>
- <dt><samp class="option">qmin</samp></dt>
- <dd><p>Sets the minimum quantizer to use when using bitrate mode.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Uses quantizer mode to encode at the given quantizer (0-255).
- </p>
- </dd>
- <dt><samp class="option">speed</samp></dt>
- <dd><p>Selects the speed preset (0-10) to encode with.
- </p>
- </dd>
- <dt><samp class="option">tiles</samp></dt>
- <dd><p>Selects how many tiles to encode with.
- </p>
- </dd>
- <dt><samp class="option">tile-rows</samp></dt>
- <dd><p>Selects how many rows of tiles to encode with.
- </p>
- </dd>
- <dt><samp class="option">tile-columns</samp></dt>
- <dd><p>Selects how many columns of tiles to encode with.
- </p>
- </dd>
- <dt><samp class="option">rav1e-params</samp></dt>
- <dd><p>Set rav1e options using a list of <var class="var">key</var>=<var class="var">value</var> pairs separated
- by ":". See <code class="command">rav1e --help</code> for a list of options.
- </p>
- <p>For example to specify librav1e encoding options with <samp class="option">-rav1e-params</samp>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -c:v librav1e -b:v 500K -rav1e-params speed=5:low_latency=true output.mp4
- </pre></div>
- </dd>
- </dl>
- <a name="libaom_002dav1"></a>
- <h3 class="section">16.8 libaom-av1<span class="pull-right"><a class="anchor hidden-xs" href="#libaom_002dav1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libaom_002dav1" aria-hidden="true">TOC</a></span></h3>
- <p>libaom AV1 encoder wrapper.
- </p>
- <p>Requires the presence of the libaom headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libaom</code>.
- </p>
- <a name="Options-31"></a>
- <h4 class="subsection">16.8.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-31" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-31" aria-hidden="true">TOC</a></span></h4>
- <p>The wrapper supports the following standard libavcodec options:
- </p>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set bitrate target in bits/second. By default this will use
- variable-bitrate mode. If <samp class="option">maxrate</samp> and <samp class="option">minrate</samp> are
- also set to the same value then it will use constant-bitrate mode,
- otherwise if <samp class="option">crf</samp> is set as well then it will use
- constrained-quality mode.
- </p>
- </dd>
- <dt><samp class="option">g keyint_min</samp></dt>
- <dd><p>Set key frame placement. The GOP size sets the maximum distance between
- key frames; if zero the output stream will be intra-only. The minimum
- distance is ignored unless it is the same as the GOP size, in which case
- key frames will always appear at a fixed interval. Not set by default,
- so without this option the library has completely free choice about
- where to place key frames.
- </p>
- </dd>
- <dt><samp class="option">qmin qmax</samp></dt>
- <dd><p>Set minimum/maximum quantisation values. Valid range is from 0 to 63
- (warning: this does not match the quantiser values actually used by AV1
- - divide by four to map real quantiser values to this range). Defaults
- to min/max (no constraint).
- </p>
- </dd>
- <dt><samp class="option">minrate maxrate bufsize rc_init_occupancy</samp></dt>
- <dd><p>Set rate control buffering parameters. Not used if not set - defaults
- to unconstrained variable bitrate.
- </p>
- </dd>
- <dt><samp class="option">threads</samp></dt>
- <dd><p>Set the number of threads to use while encoding. This may require the
- <samp class="option">tiles</samp> or <samp class="option">row-mt</samp> options to also be set to actually
- use the specified number of threads fully. Defaults to the number of
- hardware threads supported by the host machine.
- </p>
- </dd>
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Set the encoding profile. Defaults to using the profile which matches
- the bit depth and chroma subsampling of the input.
- </p>
- </dd>
- </dl>
- <p>The wrapper also has some specific options:
- </p>
- <dl class="table">
- <dt><samp class="option">cpu-used</samp></dt>
- <dd><p>Set the quality/encoding speed tradeoff. Valid range is from 0 to 8,
- higher numbers indicating greater speed and lower quality. The default
- value is 1, which will be slow and high quality.
- </p>
- </dd>
- <dt><samp class="option">auto-alt-ref</samp></dt>
- <dd><p>Enable use of alternate reference frames. Defaults to the internal
- default of the library.
- </p>
- </dd>
- <dt><samp class="option">arnr-max-frames (<em class="emph">frames</em>)</samp></dt>
- <dd><p>Set altref noise reduction max frame count. Default is -1.
- </p>
- </dd>
- <dt><samp class="option">arnr-strength (<em class="emph">strength</em>)</samp></dt>
- <dd><p>Set altref noise reduction filter strength. Range is -1 to 6. Default is -1.
- </p>
- </dd>
- <dt><samp class="option">aq-mode (<em class="emph">aq-mode</em>)</samp></dt>
- <dd><p>Set adaptive quantization mode. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none (<em class="emph">0</em>)</samp>’</dt>
- <dd><p>Disabled.
- </p>
- </dd>
- <dt>‘<samp class="samp">variance (<em class="emph">1</em>)</samp>’</dt>
- <dd><p>Variance-based.
- </p>
- </dd>
- <dt>‘<samp class="samp">complexity (<em class="emph">2</em>)</samp>’</dt>
- <dd><p>Complexity-based.
- </p>
- </dd>
- <dt>‘<samp class="samp">cyclic (<em class="emph">3</em>)</samp>’</dt>
- <dd><p>Cyclic refresh.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tune (<em class="emph">tune</em>)</samp></dt>
- <dd><p>Set the distortion metric the encoder is tuned with. Default is <code class="code">psnr</code>.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">psnr (<em class="emph">0</em>)</samp>’</dt>
- <dt>‘<samp class="samp">ssim (<em class="emph">1</em>)</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">lag-in-frames</samp></dt>
- <dd><p>Set the maximum number of frames which the encoder may keep in flight
- at any one time for lookahead purposes. Defaults to the internal
- default of the library.
- </p>
- </dd>
- <dt><samp class="option">error-resilience</samp></dt>
- <dd><p>Enable error resilience features:
- </p><dl class="table">
- <dt><samp class="option">default</samp></dt>
- <dd><p>Improve resilience against losses of whole frames.
- </p></dd>
- </dl>
- <p>Not enabled by default.
- </p>
- </dd>
- <dt><samp class="option">crf</samp></dt>
- <dd><p>Set the quality/size tradeoff for constant-quality (no bitrate target)
- and constrained-quality (with maximum bitrate target) modes. Valid
- range is 0 to 63, higher numbers indicating lower quality and smaller
- output size. Only used if set; by default only the bitrate target is
- used.
- </p>
- </dd>
- <dt><samp class="option">static-thresh</samp></dt>
- <dd><p>Set a change threshold on blocks below which they will be skipped by
- the encoder. Defined in arbitrary units as a nonnegative integer,
- defaulting to zero (no blocks are skipped).
- </p>
- </dd>
- <dt><samp class="option">drop-threshold</samp></dt>
- <dd><p>Set a threshold for dropping frames when close to rate control bounds.
- Defined as a percentage of the target buffer - when the rate control
- buffer falls below this percentage, frames will be dropped until it
- has refilled above the threshold. Defaults to zero (no frames are
- dropped).
- </p>
- </dd>
- <dt><samp class="option">denoise-noise-level (<em class="emph">level</em>)</samp></dt>
- <dd><p>Amount of noise to be removed for grain synthesis. Grain synthesis is disabled if
- this option is not set or set to 0.
- </p>
- </dd>
- <dt><samp class="option">denoise-block-size (<em class="emph">pixels</em>)</samp></dt>
- <dd><p>Block size used for denoising for grain synthesis. If not set, AV1 codec
- uses the default value of 32.
- </p>
- </dd>
- <dt><samp class="option">undershoot-pct (<em class="emph">pct</em>)</samp></dt>
- <dd><p>Set datarate undershoot (min) percentage of the target bitrate. Range is -1 to 100.
- Default is -1.
- </p>
- </dd>
- <dt><samp class="option">overshoot-pct (<em class="emph">pct</em>)</samp></dt>
- <dd><p>Set datarate overshoot (max) percentage of the target bitrate. Range is -1 to 1000.
- Default is -1.
- </p>
- </dd>
- <dt><samp class="option">minsection-pct (<em class="emph">pct</em>)</samp></dt>
- <dd><p>Minimum percentage variation of the GOP bitrate from the target bitrate. If minsection-pct
- is not set, the libaomenc wrapper computes it as follows: <code class="code">(minrate * 100 / bitrate)</code>.
- Range is -1 to 100. Default is -1 (unset).
- </p>
- </dd>
- <dt><samp class="option">maxsection-pct (<em class="emph">pct</em>)</samp></dt>
- <dd><p>Maximum percentage variation of the GOP bitrate from the target bitrate. If maxsection-pct
- is not set, the libaomenc wrapper computes it as follows: <code class="code">(maxrate * 100 / bitrate)</code>.
- Range is -1 to 5000. Default is -1 (unset).
- </p>
- </dd>
- <dt><samp class="option">frame-parallel (<em class="emph">boolean</em>)</samp></dt>
- <dd><p>Enable frame parallel decodability features. Default is true.
- </p>
- </dd>
- <dt><samp class="option">tiles</samp></dt>
- <dd><p>Set the number of tiles to encode the input video with, as columns x
- rows. Larger numbers allow greater parallelism in both encoding and
- decoding, but may decrease coding efficiency. Defaults to the minimum
- number of tiles required by the size of the input video (this is 1x1
- (that is, a single tile) for sizes up to and including 4K).
- </p>
- </dd>
- <dt><samp class="option">tile-columns tile-rows</samp></dt>
- <dd><p>Set the number of tiles as log2 of the number of tile rows and columns.
- Provided for compatibility with libvpx/VP9.
- </p>
- </dd>
- <dt><samp class="option">row-mt (Requires libaom >= 1.0.0-759-g90a15f4f2)</samp></dt>
- <dd><p>Enable row based multi-threading. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">enable-cdef (<em class="emph">boolean</em>)</samp></dt>
- <dd><p>Enable Constrained Directional Enhancement Filter. The libaom-av1
- encoder enables CDEF by default.
- </p>
- </dd>
- <dt><samp class="option">enable-restoration (<em class="emph">boolean</em>)</samp></dt>
- <dd><p>Enable Loop Restoration Filter. Default is true for libaom-av1.
- </p>
- </dd>
- <dt><samp class="option">enable-global-motion (<em class="emph">boolean</em>)</samp></dt>
- <dd><p>Enable the use of global motion for block prediction. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-intrabc (<em class="emph">boolean</em>)</samp></dt>
- <dd><p>Enable block copy mode for intra block prediction. This mode is
- useful for screen content. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-rect-partitions (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable rectangular partitions. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-1to4-partitions (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable 1:4/4:1 partitions. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-ab-partitions (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable AB shape partitions. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-angle-delta (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable angle delta intra prediction. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-cfl-intra (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable chroma predicted from luma intra prediction. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-filter-intra (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable filter intra predictor. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-intra-edge-filter (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable intra edge filter. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-smooth-intra (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable smooth intra prediction mode. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-paeth-intra (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable paeth predictor in intra prediction. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-palette (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable palette prediction mode. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-flip-idtx (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable extended transform type, including FLIPADST_DCT, DCT_FLIPADST,
- FLIPADST_FLIPADST, ADST_FLIPADST, FLIPADST_ADST, IDTX, V_DCT, H_DCT,
- V_ADST, H_ADST, V_FLIPADST, H_FLIPADST. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-tx64 (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable 64-pt transform. Default is true.
- </p>
- </dd>
- <dt><samp class="option">reduced-tx-type-set (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Use reduced set of transform types. Default is false.
- </p>
- </dd>
- <dt><samp class="option">use-intra-dct-only (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Use DCT only for INTRA modes. Default is false.
- </p>
- </dd>
- <dt><samp class="option">use-inter-dct-only (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Use DCT only for INTER modes. Default is false.
- </p>
- </dd>
- <dt><samp class="option">use-intra-default-tx-only (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Use Default-transform only for INTRA modes. Default is false.
- </p>
- </dd>
- <dt><samp class="option">enable-ref-frame-mvs (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable temporal mv prediction. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-reduced-reference-set (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Use reduced set of single and compound references. Default is false.
- </p>
- </dd>
- <dt><samp class="option">enable-obmc (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable obmc. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-dual-filter (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable dual filter. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-diff-wtd-comp (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable difference-weighted compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-dist-wtd-comp (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable distance-weighted compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-onesided-comp (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable one sided compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-interinter-wedge (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable interinter wedge compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-interintra-wedge (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable interintra wedge compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-masked-comp (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable masked compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-interintra-comp (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable interintra compound. Default is true.
- </p>
- </dd>
- <dt><samp class="option">enable-smooth-interintra (<em class="emph">boolean</em>) (Requires libaom >= v2.0.0)</samp></dt>
- <dd><p>Enable smooth interintra mode. Default is true.
- </p>
- </dd>
- <dt><samp class="option">aom-params</samp></dt>
- <dd><p>Set libaom options using a list of <var class="var">key</var>=<var class="var">value</var> pairs separated
- by ":". For a list of supported options, see <code class="command">aomenc --help</code> under the
- section "AV1 Specific Options".
- </p>
- <p>For example to specify libaom encoding options with <samp class="option">-aom-params</samp>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -c:v libaom-av1 -b:v 500K -aom-params tune=psnr:enable-tpl-model=1 output.mp4
- </pre></div>
- </dd>
- </dl>
- <a name="liboapv"></a>
- <h3 class="section">16.9 liboapv<span class="pull-right"><a class="anchor hidden-xs" href="#liboapv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-liboapv" aria-hidden="true">TOC</a></span></h3>
- <p>Advanced Professional Video codec encoder wrapper.
- </p>
- <p>This encoder requires the presence of the liboapv headers and library
- during configuration. You need to explicitly configure the build with
- <samp class="option">--enable-liboapv</samp>.
- </p>
- <div class="info">
- <p>Many liboapv encoder options are mapped to FFmpeg global codec options,
- while unique encoder options are provided through private options.
- </p></div>
- <p>The apv project website is at <a class="url" href="https://github.com/AcademySoftwareFoundation/openapv">https://github.com/AcademySoftwareFoundation/openapv</a>.
- </p>
- <a name="Options-32"></a>
- <h4 class="subsection">16.9.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-32" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-32" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the liboapv wrapper.
- </p>
- <div class="info">
- <p>To get a more extensive documentation of the liboapv options, consult the
- liboapv documentation.
- </p></div>
- <dl class="table">
- <dt><samp class="option">preset</samp></dt>
- <dd><p>Set the quality-speed tradeoff [fastest, fast, medium, slow, placebo, default]
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set the quantization parameter value for CQP rate control mode.
- </p>
- </dd>
- <dt><samp class="option">oapv-params (<em class="emph">parse_apv_params</em>)</samp></dt>
- <dd><p>Set liboapvenc options using a list of <var class="var">key</var>=<var class="var">value</var> pairs separated
- by ":". See the liboapv encoder user guide for a list of accepted parameters.
- </p></dd>
- </dl>
- <a name="libsvtav1"></a>
- <h3 class="section">16.10 libsvtav1<span class="pull-right"><a class="anchor hidden-xs" href="#libsvtav1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libsvtav1" aria-hidden="true">TOC</a></span></h3>
- <p>SVT-AV1 encoder wrapper.
- </p>
- <p>Requires the presence of the SVT-AV1 headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libsvtav1</code>.
- </p>
- <a name="Options-33"></a>
- <h4 class="subsection">16.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-33" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-33" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Set the encoding profile.
- </p><dl class="table">
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">high</samp>’</dt>
- <dt>‘<samp class="samp">professional</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set the operating point level. For example: ’4.0’
- </p>
- </dd>
- <dt><samp class="option">hielevel</samp></dt>
- <dd><p>Set the Hierarchical prediction levels.
- </p><dl class="table">
- <dt>‘<samp class="samp">3level</samp>’</dt>
- <dt>‘<samp class="samp">4level</samp>’</dt>
- <dd><p>This is the default.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tier</samp></dt>
- <dd><p>Set the operating point tier.
- </p><dl class="table">
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dd><p>This is the default.
- </p></dd>
- <dt>‘<samp class="samp">high</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">qmax</samp></dt>
- <dd><p>Set the maximum quantizer to use when using a bitrate mode.
- </p>
- </dd>
- <dt><samp class="option">qmin</samp></dt>
- <dd><p>Set the minimum quantizer to use when using a bitrate mode.
- </p>
- </dd>
- <dt><samp class="option">crf</samp></dt>
- <dd><p>Constant rate factor value used in crf rate control mode (0-63).
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set the quantizer used in cqp rate control mode (0-63).
- </p>
- </dd>
- <dt><samp class="option">sc_detection</samp></dt>
- <dd><p>Enable scene change detection.
- </p>
- </dd>
- <dt><samp class="option">la_depth</samp></dt>
- <dd><p>Set number of frames to look ahead (0-120).
- </p>
- </dd>
- <dt><samp class="option">preset</samp></dt>
- <dd><p>Set the quality-speed tradeoff, in the range 0 to 13. Higher values are
- faster but lower quality.
- </p>
- </dd>
- <dt><samp class="option">tile_rows</samp></dt>
- <dd><p>Set log2 of the number of rows of tiles to use (0-6).
- </p>
- </dd>
- <dt><samp class="option">tile_columns</samp></dt>
- <dd><p>Set log2 of the number of columns of tiles to use (0-4).
- </p>
- </dd>
- <dt><samp class="option">svtav1-params</samp></dt>
- <dd><p>Set SVT-AV1 options using a list of <var class="var">key</var>=<var class="var">value</var> pairs separated
- by ":". See the SVT-AV1 encoder user guide for a list of accepted parameters.
- </p>
- </dd>
- </dl>
- <a name="libsvtjpegxs"></a>
- <h3 class="section">16.11 libsvtjpegxs<span class="pull-right"><a class="anchor hidden-xs" href="#libsvtjpegxs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libsvtjpegxs" aria-hidden="true">TOC</a></span></h3>
- <p>SVT-JPEG-XS encoder wrapper.
- </p>
- <p>Requires the presence of the SVT-JPEG-XS headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libsvtjpegxs</code>.
- </p>
- <a name="Options-34"></a>
- <h4 class="subsection">16.11.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-34" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-34" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">decomp_v</samp></dt>
- <dd><p>Set vertical decomposition level
- </p></dd>
- <dt><samp class="option">decomp_h</samp></dt>
- <dd><p>Set horizontal decomposition level
- </p>
- </dd>
- <dt><samp class="option">quantization</samp></dt>
- <dd><p>Set the quantization algorithm.
- </p><dl class="table">
- <dt>‘<samp class="samp">deadzone</samp>’</dt>
- <dt>‘<samp class="samp">uniform</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">coding-signs</samp></dt>
- <dd><p>Enable Signs handling strategy
- </p><dl class="table">
- <dt>‘<samp class="samp">disable</samp>’</dt>
- <dt>‘<samp class="samp">fast</samp>’</dt>
- <dt>‘<samp class="samp">full</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">coding-sigf</samp></dt>
- <dd><p>Enable Significance coding
- </p>
- </dd>
- <dt><samp class="option">coding-vpred</samp></dt>
- <dd><p>Enable Vertical Prediction coding
- </p><dl class="table">
- <dt>‘<samp class="samp">disable</samp>’</dt>
- <dt>‘<samp class="samp">no_residuals</samp>’</dt>
- <dt>‘<samp class="samp">no_coeffs</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="libjxl"></a>
- <h3 class="section">16.12 libjxl<span class="pull-right"><a class="anchor hidden-xs" href="#libjxl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libjxl" aria-hidden="true">TOC</a></span></h3>
- <p>libjxl JPEG XL encoder wrapper.
- </p>
- <p>Requires the presence of the libjxl headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libjxl</code>.
- </p>
- <a name="Options-35"></a>
- <h4 class="subsection">16.12.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-35" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-35" aria-hidden="true">TOC</a></span></h4>
- <p>The libjxl wrapper supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">distance</samp></dt>
- <dd><p>Set the target Butteraugli distance. This is a quality setting: lower
- distance yields higher quality, with distance=1.0 roughly comparable to
- libjpeg Quality 90 for photographic content. Setting distance=0.0 yields
- true lossless encoding. Valid values range between 0.0 and 15.0, and sane
- values rarely exceed 5.0. Setting distance=0.1 usually attains
- transparency for most input. The default is 1.0.
- </p>
- </dd>
- <dt><samp class="option">effort</samp></dt>
- <dd><p>Set the encoding effort used. Higher effort values produce more consistent
- quality and usually produces a better quality/bpp curve, at the cost of
- more CPU time required. Valid values range from 1 to 9, and the default is 7.
- </p>
- </dd>
- <dt><samp class="option">modular</samp></dt>
- <dd><p>Force the encoder to use Modular mode instead of choosing automatically. The
- default is to use VarDCT for lossy encoding and Modular for lossless. VarDCT
- is generally superior to Modular for lossy encoding but does not support
- lossless encoding.
- </p>
- </dd>
- </dl>
- <a name="libkvazaar"></a>
- <h3 class="section">16.13 libkvazaar<span class="pull-right"><a class="anchor hidden-xs" href="#libkvazaar" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libkvazaar" aria-hidden="true">TOC</a></span></h3>
- <p>Kvazaar H.265/HEVC encoder.
- </p>
- <p>Requires the presence of the libkvazaar headers and library during
- configuration. You need to explicitly configure the build with
- <samp class="option">--enable-libkvazaar</samp>.
- </p>
- <a name="Options-36"></a>
- <h4 class="subsection">16.13.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-36" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-36" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set target video bitrate in bit/s and enable rate control.
- </p>
- </dd>
- <dt><samp class="option">kvazaar-params</samp></dt>
- <dd><p>Set kvazaar parameters as a list of <var class="var">name</var>=<var class="var">value</var> pairs separated
- by commas (,). See kvazaar documentation for a list of options.
- </p>
- </dd>
- </dl>
- <a name="libopenh264"></a>
- <h3 class="section">16.14 libopenh264<span class="pull-right"><a class="anchor hidden-xs" href="#libopenh264" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopenh264" aria-hidden="true">TOC</a></span></h3>
- <p>Cisco libopenh264 H.264/MPEG-4 AVC encoder wrapper.
- </p>
- <p>This encoder requires the presence of the libopenh264 headers and
- library during configuration. You need to explicitly configure the
- build with <code class="code">--enable-libopenh264</code>. The library is detected using
- <code class="command">pkg-config</code>.
- </p>
- <p>For more information about the library see
- <a class="url" href="http://www.openh264.org">http://www.openh264.org</a>.
- </p>
- <a name="Options-37"></a>
- <h4 class="subsection">16.14.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-37" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-37" aria-hidden="true">TOC</a></span></h4>
- <p>The following FFmpeg global options affect the configurations of the
- libopenh264 encoder.
- </p>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set the bitrate (as a number of bits per second).
- </p>
- </dd>
- <dt><samp class="option">g</samp></dt>
- <dd><p>Set the GOP size.
- </p>
- </dd>
- <dt><samp class="option">maxrate</samp></dt>
- <dd><p>Set the max bitrate (as a number of bits per second).
- </p>
- </dd>
- <dt><samp class="option">flags +global_header</samp></dt>
- <dd><p>Set global header in the bitstream.
- </p>
- </dd>
- <dt><samp class="option">slices</samp></dt>
- <dd><p>Set the number of slices, used in parallelized encoding. Default value
- is 0. This is only used when <samp class="option">slice_mode</samp> is set to
- ‘<samp class="samp">fixed</samp>’.
- </p>
- </dd>
- <dt><samp class="option">loopfilter</samp></dt>
- <dd><p>Enable loop filter, if set to 1 (automatically enabled). To disable
- set a value of 0.
- </p>
- </dd>
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Set profile restrictions. If set to the value of ‘<samp class="samp">main</samp>’ enable
- CABAC (set the <code class="code">SEncParamExt.iEntropyCodingModeFlag</code> flag to 1).
- </p>
- </dd>
- <dt><samp class="option">max_nal_size</samp></dt>
- <dd><p>Set maximum NAL size in bytes.
- </p>
- </dd>
- <dt><samp class="option">allow_skip_frames</samp></dt>
- <dd><p>Allow skipping frames to hit the target bitrate if set to 1.
- </p></dd>
- </dl>
- <a name="libtheora"></a>
- <h3 class="section">16.15 libtheora<span class="pull-right"><a class="anchor hidden-xs" href="#libtheora" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libtheora" aria-hidden="true">TOC</a></span></h3>
- <p>libtheora Theora encoder wrapper.
- </p>
- <p>Requires the presence of the libtheora headers and library during
- configuration. You need to explicitly configure the build with
- <code class="code">--enable-libtheora</code>.
- </p>
- <p>For more information about the libtheora project see
- <a class="url" href="http://www.theora.org/">http://www.theora.org/</a>.
- </p>
- <a name="Options-38"></a>
- <h4 class="subsection">16.15.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-38" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-38" aria-hidden="true">TOC</a></span></h4>
- <p>The following global options are mapped to internal libtheora options
- which affect the quality and the bitrate of the encoded stream.
- </p>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set the video bitrate in bit/s for CBR (Constant Bit Rate) mode. In
- case VBR (Variable Bit Rate) mode is enabled this option is ignored.
- </p>
- </dd>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>Used to enable constant quality mode (VBR) encoding through the
- <samp class="option">qscale</samp> flag, and to enable the <code class="code">pass1</code> and <code class="code">pass2</code>
- modes.
- </p>
- </dd>
- <dt><samp class="option">g</samp></dt>
- <dd><p>Set the GOP size.
- </p>
- </dd>
- <dt><samp class="option">global_quality</samp></dt>
- <dd><p>Set the global quality as an integer in lambda units.
- </p>
- <p>Only relevant when VBR mode is enabled with <code class="code">flags +qscale</code>. The
- value is converted to QP units by dividing it by <code class="code">FF_QP2LAMBDA</code>,
- clipped in the [0 - 10] range, and then multiplied by 6.3 to get a
- value in the native libtheora range [0-63]. A higher value corresponds
- to a higher quality.
- </p>
- </dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Enable VBR mode when set to a non-negative value, and set constant
- quality value as a double floating point value in QP units.
- </p>
- <p>The value is clipped in the [0-10] range, and then multiplied by 6.3
- to get a value in the native libtheora range [0-63].
- </p>
- <p>This option is valid only using the <code class="command">ffmpeg</code> command-line
- tool. For library interface users, use <samp class="option">global_quality</samp>.
- </p></dd>
- </dl>
- <a name="Examples-5"></a>
- <h4 class="subsection">16.15.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-5" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Set maximum constant quality (VBR) encoding with <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -codec:v libtheora -q:v 10 OUTPUT.ogg
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to convert a CBR 1000 kbps Theora video stream:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -codec:v libtheora -b:v 1000k OUTPUT.ogg
- </pre></div>
- </li></ul>
- <a name="libvpx"></a>
- <h3 class="section">16.16 libvpx<span class="pull-right"><a class="anchor hidden-xs" href="#libvpx" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvpx" aria-hidden="true">TOC</a></span></h3>
- <p>VP8/VP9 format supported through libvpx.
- </p>
- <p>Requires the presence of the libvpx headers and library during configuration.
- You need to explicitly configure the build with <code class="code">--enable-libvpx</code>.
- </p>
- <a name="Options-39"></a>
- <h4 class="subsection">16.16.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-39" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-39" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libvpx wrapper. The
- <code class="command">vpxenc</code>-equivalent options or values are listed in parentheses
- for easy migration.
- </p>
- <p>To reduce the duplication of documentation, only the private options
- and some others requiring special attention are documented here. For
- the documentation of the undocumented generic options, see
- <a class="ref" href="#codec_002doptions">the Codec Options chapter</a>.
- </p>
- <p>To get more documentation of the libvpx options, invoke the command
- <code class="command">ffmpeg -h encoder=libvpx</code>, <code class="command">ffmpeg -h encoder=libvpx-vp9</code> or
- <code class="command">vpxenc --help</code>. Further information is available in the libvpx API
- documentation.
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">target-bitrate</em>)</samp></dt>
- <dd><p>Set bitrate in bits/s. Note that FFmpeg’s <samp class="option">b</samp> option is
- expressed in bits/s, while <code class="command">vpxenc</code>’s <samp class="option">target-bitrate</samp> is in
- kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">g (<em class="emph">kf-max-dist</em>)</samp></dt>
- <dt><samp class="option">keyint_min (<em class="emph">kf-min-dist</em>)</samp></dt>
- <dt><samp class="option">qmin (<em class="emph">min-q</em>)</samp></dt>
- <dd><p>Minimum (Best Quality) Quantizer.
- </p>
- </dd>
- <dt><samp class="option">qmax (<em class="emph">max-q</em>)</samp></dt>
- <dd><p>Maximum (Worst Quality) Quantizer.
- Can be changed per-frame.
- </p>
- </dd>
- <dt><samp class="option">bufsize (<em class="emph">buf-sz</em>, <em class="emph">buf-optimal-sz</em>)</samp></dt>
- <dd><p>Set ratecontrol buffer size (in bits). Note <code class="command">vpxenc</code>’s options are
- specified in milliseconds, the libvpx wrapper converts this value as follows:
- <code class="code">buf-sz = bufsize * 1000 / bitrate</code>,
- <code class="code">buf-optimal-sz = bufsize * 1000 / bitrate * 5 / 6</code>.
- </p>
- </dd>
- <dt><samp class="option">rc_init_occupancy (<em class="emph">buf-initial-sz</em>)</samp></dt>
- <dd><p>Set number of bits which should be loaded into the rc buffer before decoding
- starts. Note <code class="command">vpxenc</code>’s option is specified in milliseconds, the libvpx
- wrapper converts this value as follows:
- <code class="code">rc_init_occupancy * 1000 / bitrate</code>.
- </p>
- </dd>
- <dt><samp class="option">undershoot-pct</samp></dt>
- <dd><p>Set datarate undershoot (min) percentage of the target bitrate.
- </p>
- </dd>
- <dt><samp class="option">overshoot-pct</samp></dt>
- <dd><p>Set datarate overshoot (max) percentage of the target bitrate.
- </p>
- </dd>
- <dt><samp class="option">skip_threshold (<em class="emph">drop-frame</em>)</samp></dt>
- <dt><samp class="option">qcomp (<em class="emph">bias-pct</em>)</samp></dt>
- <dt><samp class="option">maxrate (<em class="emph">maxsection-pct</em>)</samp></dt>
- <dd><p>Set GOP max bitrate in bits/s. Note <code class="command">vpxenc</code>’s option is specified as a
- percentage of the target bitrate, the libvpx wrapper converts this value as
- follows: <code class="code">(maxrate * 100 / bitrate)</code>.
- </p>
- </dd>
- <dt><samp class="option">minrate (<em class="emph">minsection-pct</em>)</samp></dt>
- <dd><p>Set GOP min bitrate in bits/s. Note <code class="command">vpxenc</code>’s option is specified as a
- percentage of the target bitrate, the libvpx wrapper converts this value as
- follows: <code class="code">(minrate * 100 / bitrate)</code>.
- </p>
- </dd>
- <dt><samp class="option">minrate, maxrate, b <em class="emph">end-usage=cbr</em></samp></dt>
- <dd><p><code class="code">(minrate == maxrate == bitrate)</code>.
- </p>
- </dd>
- <dt><samp class="option">crf (<em class="emph">end-usage=cq</em>, <em class="emph">cq-level</em>)</samp></dt>
- <dt><samp class="option">tune (<em class="emph">tune</em>)</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">psnr (<em class="emph">psnr</em>)</samp>’</dt>
- <dt>‘<samp class="samp">ssim (<em class="emph">ssim</em>)</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">quality, deadline (<em class="emph">deadline</em>)</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">best</samp>’</dt>
- <dd><p>Use best quality deadline. Poorly named and quite slow, this option should be
- avoided as it may give worse quality output than good.
- </p></dd>
- <dt>‘<samp class="samp">good</samp>’</dt>
- <dd><p>Use good quality deadline. This is a good trade-off between speed and quality
- when used with the <samp class="option">cpu-used</samp> option.
- </p></dd>
- <dt>‘<samp class="samp">realtime</samp>’</dt>
- <dd><p>Use realtime quality deadline.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">speed, cpu-used (<em class="emph">cpu-used</em>)</samp></dt>
- <dd><p>Set quality/speed ratio modifier. Higher values speed up the encode at the cost
- of quality.
- </p>
- </dd>
- <dt><samp class="option">nr (<em class="emph">noise-sensitivity</em>)</samp></dt>
- <dt><samp class="option">static-thresh</samp></dt>
- <dd><p>Set a change threshold on blocks below which they will be skipped by the
- encoder.
- </p>
- </dd>
- <dt><samp class="option">slices (<em class="emph">token-parts</em>)</samp></dt>
- <dd><p>Note that FFmpeg’s <samp class="option">slices</samp> option gives the total number of partitions,
- while <code class="command">vpxenc</code>’s <samp class="option">token-parts</samp> is given as
- <code class="code">log2(partitions)</code>.
- </p>
- </dd>
- <dt><samp class="option">max-intra-rate</samp></dt>
- <dd><p>Set maximum I-frame bitrate as a percentage of the target bitrate. A value of 0
- means unlimited.
- </p>
- </dd>
- <dt><samp class="option">force_key_frames</samp></dt>
- <dd><p><code class="code">VPX_EFLAG_FORCE_KF</code>
- </p>
- </dd>
- <dt><samp class="option">Alternate reference frame related</samp></dt>
- <dd><dl class="table">
- <dt><samp class="option">auto-alt-ref</samp></dt>
- <dd><p>Enable use of alternate reference frames (2-pass only).
- Values greater than 1 enable multi-layer alternate reference frames (VP9 only).
- </p></dd>
- <dt><samp class="option">arnr-maxframes</samp></dt>
- <dd><p>Set altref noise reduction max frame count.
- </p></dd>
- <dt><samp class="option">arnr-type</samp></dt>
- <dd><p>Set altref noise reduction filter type: backward, forward, centered.
- </p></dd>
- <dt><samp class="option">arnr-strength</samp></dt>
- <dd><p>Set altref noise reduction filter strength.
- </p></dd>
- <dt><samp class="option">rc-lookahead, lag-in-frames (<em class="emph">lag-in-frames</em>)</samp></dt>
- <dd><p>Set number of frames to look ahead for frametype and ratecontrol.
- </p></dd>
- <dt><samp class="option">min-gf-interval</samp></dt>
- <dd><p>Set minimum golden/alternate reference frame interval (VP9 only).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">error-resilient</samp></dt>
- <dd><p>Enable error resiliency features.
- </p>
- </dd>
- <dt><samp class="option">sharpness <var class="var">integer</var></samp></dt>
- <dd><p>Increase sharpness at the expense of lower PSNR.
- The valid range is [0, 7].
- </p>
- </dd>
- <dt><samp class="option">ts-parameters</samp></dt>
- <dd><p>Sets the temporal scalability configuration using a :-separated list of
- key=value pairs. For example, to specify temporal scalability parameters
- with <code class="code">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v libvpx -ts-parameters ts_number_layers=3:\
- ts_target_bitrate=250,500,1000:ts_rate_decimator=4,2,1:\
- ts_periodicity=4:ts_layer_id=0,2,1,2:ts_layering_mode=3 OUTPUT
- </pre></div>
- <p>Below is a brief explanation of each of the parameters, please
- refer to <code class="code">struct vpx_codec_enc_cfg</code> in <code class="code">vpx/vpx_encoder.h</code> for more
- details.
- </p><dl class="table">
- <dt><samp class="option">ts_number_layers</samp></dt>
- <dd><p>Number of temporal coding layers.
- </p></dd>
- <dt><samp class="option">ts_target_bitrate</samp></dt>
- <dd><p>Target bitrate for each temporal layer (in kbps).
- (bitrate should be inclusive of the lower temporal layer).
- </p></dd>
- <dt><samp class="option">ts_rate_decimator</samp></dt>
- <dd><p>Frame rate decimation factor for each temporal layer.
- </p></dd>
- <dt><samp class="option">ts_periodicity</samp></dt>
- <dd><p>Length of the sequence defining frame temporal layer membership.
- </p></dd>
- <dt><samp class="option">ts_layer_id</samp></dt>
- <dd><p>Template defining the membership of frames to temporal layers.
- </p></dd>
- <dt><samp class="option">ts_layering_mode</samp></dt>
- <dd><p>(optional) Selecting the temporal structure from a set of pre-defined temporal layering modes.
- Currently supports the following options.
- </p><dl class="table">
- <dt><samp class="option">0</samp></dt>
- <dd><p>No temporal layering flags are provided internally,
- relies on flags being passed in using <code class="code">metadata</code> field in <code class="code">AVFrame</code>
- with following keys.
- </p><dl class="table">
- <dt><samp class="option">vp8-flags</samp></dt>
- <dd><p>Sets the flags passed into the encoder to indicate the referencing scheme for
- the current frame.
- Refer to function <code class="code">vpx_codec_encode</code> in <code class="code">vpx/vpx_encoder.h</code> for more
- details.
- </p></dd>
- <dt><samp class="option">temporal_id</samp></dt>
- <dd><p>Explicitly sets the temporal id of the current frame to encode.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">2</samp></dt>
- <dd><p>Two temporal layers. 0-1...
- </p></dd>
- <dt><samp class="option">3</samp></dt>
- <dd><p>Three temporal layers. 0-2-1-2...; with single reference frame.
- </p></dd>
- <dt><samp class="option">4</samp></dt>
- <dd><p>Same as option "3", except there is a dependency between
- the two temporal layer 2 frames within the temporal period.
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">VP8-specific options</samp></dt>
- <dd><dl class="table">
- <dt><samp class="option">screen-content-mode</samp></dt>
- <dd><p>Screen content mode, one of: 0 (off), 1 (screen), 2 (screen with more aggressive rate control).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">VP9-specific options</samp></dt>
- <dd><dl class="table">
- <dt><samp class="option">lossless</samp></dt>
- <dd><p>Enable lossless mode.
- </p></dd>
- <dt><samp class="option">tile-columns</samp></dt>
- <dd><p>Set number of tile columns to use. Note this is given as
- <code class="code">log2(tile_columns)</code>. For example, 8 tile columns would be requested by
- setting the <samp class="option">tile-columns</samp> option to 3.
- </p></dd>
- <dt><samp class="option">tile-rows</samp></dt>
- <dd><p>Set number of tile rows to use. Note this is given as <code class="code">log2(tile_rows)</code>.
- For example, 4 tile rows would be requested by setting the <samp class="option">tile-rows</samp>
- option to 2.
- </p></dd>
- <dt><samp class="option">frame-parallel</samp></dt>
- <dd><p>Enable frame parallel decodability features.
- </p></dd>
- <dt><samp class="option">aq-mode</samp></dt>
- <dd><p>Set adaptive quantization mode (0: off (default), 1: variance 2: complexity, 3:
- cyclic refresh, 4: equator360).
- </p></dd>
- <dt><samp class="option">colorspace <em class="emph">color-space</em></samp></dt>
- <dd><p>Set input color space. The VP9 bitstream supports signaling the following
- colorspaces:
- </p><dl class="table">
- <dt><samp class="option">‘<samp class="samp">rgb</samp>’ <em class="emph">sRGB</em></samp></dt>
- <dt><samp class="option">‘<samp class="samp">bt709</samp>’ <em class="emph">bt709</em></samp></dt>
- <dt><samp class="option">‘<samp class="samp">unspecified</samp>’ <em class="emph">unknown</em></samp></dt>
- <dt><samp class="option">‘<samp class="samp">bt470bg</samp>’ <em class="emph">bt601</em></samp></dt>
- <dt><samp class="option">‘<samp class="samp">smpte170m</samp>’ <em class="emph">smpte170</em></samp></dt>
- <dt><samp class="option">‘<samp class="samp">smpte240m</samp>’ <em class="emph">smpte240</em></samp></dt>
- <dt><samp class="option">‘<samp class="samp">bt2020_ncl</samp>’ <em class="emph">bt2020</em></samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">row-mt <var class="var">boolean</var></samp></dt>
- <dd><p>Enable row based multi-threading.
- </p></dd>
- <dt><samp class="option">tune-content</samp></dt>
- <dd><p>Set content type: default (0), screen (1), film (2).
- </p></dd>
- <dt><samp class="option">corpus-complexity</samp></dt>
- <dd><p>Corpus VBR mode is a variant of standard VBR where the complexity distribution
- midpoint is passed in rather than calculated for a specific clip or chunk.
- </p>
- <p>The valid range is [0, 10000]. 0 (default) uses standard VBR.
- </p></dd>
- <dt><samp class="option">enable-tpl <var class="var">boolean</var></samp></dt>
- <dd><p>Enable temporal dependency model.
- </p></dd>
- <dt><samp class="option">ref-frame-config</samp></dt>
- <dd><p>Using per-frame metadata, set members of the structure <code class="code">vpx_svc_ref_frame_config_t</code> in <code class="code">vpx/vp8cx.h</code> to fine-control referencing schemes and frame buffer management.
- <br>Use a :-separated list of key=value pairs.
- For example,
- </p><div class="example">
- <pre class="example-preformatted">av_dict_set(&av_frame->metadata, "ref-frame-config", \
- "rfc_update_buffer_slot=7:rfc_lst_fb_idx=0:rfc_gld_fb_idx=1:rfc_alt_fb_idx=2:rfc_reference_last=0:rfc_reference_golden=0:rfc_reference_alt_ref=0");
- </pre></div>
- <dl class="table">
- <dt><samp class="option">rfc_update_buffer_slot</samp></dt>
- <dd><p>Indicates the buffer slot number to update
- </p></dd>
- <dt><samp class="option">rfc_update_last</samp></dt>
- <dd><p>Indicates whether to update the LAST frame
- </p></dd>
- <dt><samp class="option">rfc_update_golden</samp></dt>
- <dd><p>Indicates whether to update GOLDEN frame
- </p></dd>
- <dt><samp class="option">rfc_update_alt_ref</samp></dt>
- <dd><p>Indicates whether to update ALT_REF frame
- </p></dd>
- <dt><samp class="option">rfc_lst_fb_idx</samp></dt>
- <dd><p>LAST frame buffer index
- </p></dd>
- <dt><samp class="option">rfc_gld_fb_idx</samp></dt>
- <dd><p>GOLDEN frame buffer index
- </p></dd>
- <dt><samp class="option">rfc_alt_fb_idx</samp></dt>
- <dd><p>ALT_REF frame buffer index
- </p></dd>
- <dt><samp class="option">rfc_reference_last</samp></dt>
- <dd><p>Indicates whether to reference LAST frame
- </p></dd>
- <dt><samp class="option">rfc_reference_golden</samp></dt>
- <dd><p>Indicates whether to reference GOLDEN frame
- </p></dd>
- <dt><samp class="option">rfc_reference_alt_ref</samp></dt>
- <dd><p>Indicates whether to reference ALT_REF frame
- </p></dd>
- <dt><samp class="option">rfc_reference_duration</samp></dt>
- <dd><p>Indicates frame duration
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- </dl>
- <p>For more information about libvpx see:
- <a class="url" href="http://www.webmproject.org/">http://www.webmproject.org/</a>
- </p>
- <a name="libvvenc"></a>
- <h3 class="section">16.17 libvvenc<span class="pull-right"><a class="anchor hidden-xs" href="#libvvenc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvvenc" aria-hidden="true">TOC</a></span></h3>
- <p>VVenC H.266/VVC encoder wrapper.
- </p>
- <p>This encoder requires the presence of the libvvenc headers and library
- during configuration. You need to explicitly configure the build with
- <samp class="option">--enable-libvvenc</samp>.
- </p>
- <p>The VVenC project website is at
- <a class="url" href="https://github.com/fraunhoferhhi/vvenc">https://github.com/fraunhoferhhi/vvenc</a>.
- </p>
- <a name="Supported-Pixel-Formats"></a>
- <h4 class="subsection">16.17.1 Supported Pixel Formats<span class="pull-right"><a class="anchor hidden-xs" href="#Supported-Pixel-Formats" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Supported-Pixel-Formats" aria-hidden="true">TOC</a></span></h4>
- <p>VVenC supports only 10-bit color spaces as input. But the internal (encoded)
- bit depth can be set to 8-bit or 10-bit at runtime.
- </p>
- <a name="Options-40"></a>
- <h4 class="subsection">16.17.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-40" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-40" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Sets target video bitrate.
- </p>
- </dd>
- <dt><samp class="option">g</samp></dt>
- <dd><p>Set the GOP size. Currently support for g=1 (Intra only) or default.
- </p>
- </dd>
- <dt><samp class="option">preset</samp></dt>
- <dd><p>Set the VVenC preset.
- </p>
- </dd>
- <dt><samp class="option">levelidc</samp></dt>
- <dd><p>Set level idc.
- </p>
- </dd>
- <dt><samp class="option">tier</samp></dt>
- <dd><p>Set vvc tier.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set constant quantization parameter.
- </p>
- </dd>
- <dt><samp class="option">subopt <var class="var">boolean</var></samp></dt>
- <dd><p>Set subjective (perceptually motivated) optimization. Default is 1 (on).
- </p>
- </dd>
- <dt><samp class="option">bitdepth8 <var class="var">boolean</var></samp></dt>
- <dd><p>Set 8bit coding mode instead of using 10bit. Default is 0 (off).
- </p>
- </dd>
- <dt><samp class="option">period</samp></dt>
- <dd><p>set (intra) refresh period in seconds.
- </p>
- </dd>
- <dt><samp class="option">vvenc-params</samp></dt>
- <dd><p>Set vvenc options using a list of <var class="var">key</var>=<var class="var">value</var> couples separated
- by ":". See <code class="command">vvencapp --fullhelp</code> or <code class="command">vvencFFapp --fullhelp</code> for a list of options.
- </p>
- <p>For example, the options might be provided as:
- </p>
- <div class="example">
- <pre class="example-preformatted">intraperiod=64:decodingrefreshtype=idr:poc0idr=1:internalbitdepth=8
- </pre></div>
- <p>For example the encoding options might be provided with <samp class="option">-vvenc-params</samp>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -c:v libvvenc -b 1M -vvenc-params intraperiod=64:decodingrefreshtype=idr:poc0idr=1:internalbitdepth=8 output.mp4
- </pre></div>
- </dd>
- </dl>
- <a name="libwebp"></a>
- <h3 class="section">16.18 libwebp<span class="pull-right"><a class="anchor hidden-xs" href="#libwebp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libwebp" aria-hidden="true">TOC</a></span></h3>
- <p>libwebp WebP Image encoder wrapper
- </p>
- <p>libwebp is Google’s official encoder for WebP images. It can encode in either
- lossy or lossless mode. Lossy images are essentially a wrapper around a VP8
- frame. Lossless images are a separate codec developed by Google.
- </p>
- <a name="Pixel-Format"></a>
- <h4 class="subsection">16.18.1 Pixel Format<span class="pull-right"><a class="anchor hidden-xs" href="#Pixel-Format" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Pixel-Format" aria-hidden="true">TOC</a></span></h4>
- <p>Currently, libwebp only supports YUV420 for lossy and RGB for lossless due
- to limitations of the format and libwebp. Alpha is supported for either mode.
- Because of API limitations, if RGB is passed in when encoding lossy or YUV is
- passed in for encoding lossless, the pixel format will automatically be
- converted using functions from libwebp. This is not ideal and is done only for
- convenience.
- </p>
- <a name="Options-41"></a>
- <h4 class="subsection">16.18.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-41" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-41" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">-lossless <var class="var">boolean</var></samp></dt>
- <dd><p>Enables/Disables use of lossless mode. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">-compression_level <var class="var">integer</var></samp></dt>
- <dd><p>For lossy, this is a quality/speed tradeoff. Higher values give better quality
- for a given size at the cost of increased encoding time. For lossless, this is
- a size/speed tradeoff. Higher values give smaller size at the cost of increased
- encoding time. More specifically, it controls the number of extra algorithms
- and compression tools used, and varies the combination of these tools. This
- maps to the <var class="var">method</var> option in libwebp. The valid range is 0 to 6.
- Default is 4.
- </p>
- </dd>
- <dt><samp class="option">-quality <var class="var">float</var></samp></dt>
- <dd><p>For lossy encoding, this controls image quality. For lossless encoding, this
- controls the effort and time spent in compression.
- Range is 0 to 100. Default is 75.
- </p>
- </dd>
- <dt><samp class="option">-preset <var class="var">type</var></samp></dt>
- <dd><p>Configuration preset. This does some automatic settings based on the general
- type of the image.
- </p><dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>Do not use a preset.
- </p></dd>
- <dt><samp class="option">default</samp></dt>
- <dd><p>Use the encoder default.
- </p></dd>
- <dt><samp class="option">picture</samp></dt>
- <dd><p>Digital picture, like portrait, inner shot
- </p></dd>
- <dt><samp class="option">photo</samp></dt>
- <dd><p>Outdoor photograph, with natural lighting
- </p></dd>
- <dt><samp class="option">drawing</samp></dt>
- <dd><p>Hand or line drawing, with high-contrast details
- </p></dd>
- <dt><samp class="option">icon</samp></dt>
- <dd><p>Small-sized colorful images
- </p></dd>
- <dt><samp class="option">text</samp></dt>
- <dd><p>Text-like
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="libx264_002c-libx264rgb"></a>
- <h3 class="section">16.19 libx264, libx264rgb<span class="pull-right"><a class="anchor hidden-xs" href="#libx264_002c-libx264rgb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libx264_002c-libx264rgb" aria-hidden="true">TOC</a></span></h3>
- <p>x264 H.264/MPEG-4 AVC encoder wrapper.
- </p>
- <p>This encoder requires the presence of the libx264 headers and library
- during configuration. You need to explicitly configure the build with
- <code class="code">--enable-libx264</code>.
- </p>
- <p>libx264 supports an impressive number of features, including 8x8 and
- 4x4 adaptive spatial transform, adaptive B-frame placement, CAVLC/CABAC
- entropy coding, interlacing (MBAFF), lossless mode, psy optimizations
- for detail retention (adaptive quantization, psy-RD, psy-trellis).
- </p>
- <p>Many libx264 encoder options are mapped to FFmpeg global codec
- options, while unique encoder options are provided through private
- options. Additionally the <samp class="option">x264opts</samp> and <samp class="option">x264-params</samp>
- private options allows one to pass a list of key=value tuples as accepted
- by the libx264 <code class="code">x264_param_parse</code> function.
- </p>
- <p>The x264 project website is at
- <a class="url" href="http://www.videolan.org/developers/x264.html">http://www.videolan.org/developers/x264.html</a>.
- </p>
- <p>The libx264rgb encoder is the same as libx264, except it accepts packed RGB
- pixel formats as input instead of YUV.
- </p>
- <a name="Supported-Pixel-Formats-1"></a>
- <h4 class="subsection">16.19.1 Supported Pixel Formats<span class="pull-right"><a class="anchor hidden-xs" href="#Supported-Pixel-Formats-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Supported-Pixel-Formats-1" aria-hidden="true">TOC</a></span></h4>
- <p>x264 supports 8- to 10-bit color spaces. The exact bit depth is controlled at
- x264’s configure time.
- </p>
- <a name="Options-42"></a>
- <h4 class="subsection">16.19.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-42" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-42" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libx264 wrapper. The
- <code class="command">x264</code>-equivalent options or values are listed in parentheses
- for easy migration.
- </p>
- <p>To reduce the duplication of documentation, only the private options
- and some others requiring special attention are documented here. For
- the documentation of the undocumented generic options, see
- <a class="ref" href="#codec_002doptions">the Codec Options chapter</a>.
- </p>
- <p>To get a more accurate and extensive documentation of the libx264
- options, invoke the command <code class="command">x264 --fullhelp</code> or consult
- the libx264 documentation.
- </p>
- <p>In the list below, note that the <code class="command">x264</code> option name is shown
- in parentheses after the libavcodec corresponding name, in case there
- is a direct mapping.
- </p>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">bitrate</em>)</samp></dt>
- <dd><p>Set bitrate in bits/s. Note that FFmpeg’s <samp class="option">b</samp> option is
- expressed in bits/s, while <code class="command">x264</code>’s <samp class="option">bitrate</samp> is in
- kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">bf (<em class="emph">bframes</em>)</samp></dt>
- <dd><p>Number of B-frames between I and P-frames
- </p>
- </dd>
- <dt><samp class="option">g (<em class="emph">keyint</em>)</samp></dt>
- <dd><p>Maximum GOP size
- </p>
- </dd>
- <dt><samp class="option">qmin (<em class="emph">qpmin</em>)</samp></dt>
- <dd><p>Minimum quantizer scale
- </p>
- </dd>
- <dt><samp class="option">qmax (<em class="emph">qpmax</em>)</samp></dt>
- <dd><p>Maximum quantizer scale
- </p>
- </dd>
- <dt><samp class="option">qdiff (<em class="emph">qpstep</em>)</samp></dt>
- <dd><p>Maximum difference between quantizer scales
- </p>
- </dd>
- <dt><samp class="option">qblur (<em class="emph">qblur</em>)</samp></dt>
- <dd><p>Quantizer curve blur
- </p>
- </dd>
- <dt><samp class="option">qcomp (<em class="emph">qcomp</em>)</samp></dt>
- <dd><p>Quantizer curve compression factor
- </p>
- </dd>
- <dt><samp class="option">refs (<em class="emph">ref</em>)</samp></dt>
- <dd><p>Number of reference frames each P-frame can use. The range is <var class="var">0-16</var>.
- </p>
- </dd>
- <dt><samp class="option">level (<em class="emph">level</em>)</samp></dt>
- <dd><p>Set the <code class="code">x264_param_t.i_level_idc</code> value in case the value is
- positive, it is ignored otherwise.
- </p>
- <p>This value can be set using the <code class="code">AVCodecContext</code> API (e.g. by
- setting the <code class="code">AVCodecContext</code> value directly), and is specified as
- an integer mapped on a corresponding level (e.g. the value 31 maps
- to H.264 level IDC "3.1", as defined in the <code class="code">x264_levels</code>
- table). It is ignored when set to a non positive value.
- </p>
- <p>Alternatively it can be set as a private option, overriding the value
- set in <code class="code">AVCodecContext</code>, and in this case must be specified as
- the level IDC identifier (e.g. "3.1"), as defined by H.264 Annex A.
- </p>
- </dd>
- <dt><samp class="option">sc_threshold (<em class="emph">scenecut</em>)</samp></dt>
- <dd><p>Sets the threshold for the scene change detection.
- </p>
- </dd>
- <dt><samp class="option">trellis (<em class="emph">trellis</em>)</samp></dt>
- <dd><p>Performs Trellis quantization to increase efficiency. Enabled by default.
- </p>
- </dd>
- <dt><samp class="option">nr (<em class="emph">nr</em>)</samp></dt>
- <dd><p>Noise reduction
- </p>
- </dd>
- <dt><samp class="option">me_range (<em class="emph">merange</em>)</samp></dt>
- <dd><p>Maximum range of the motion search in pixels.
- </p>
- </dd>
- <dt><samp class="option">me_method (<em class="emph">me</em>)</samp></dt>
- <dd><p>Set motion estimation method. Possible values in the decreasing order
- of speed:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">dia (<em class="emph">dia</em>)</samp>’</dt>
- <dt>‘<samp class="samp">epzs (<em class="emph">dia</em>)</samp>’</dt>
- <dd><p>Diamond search with radius 1 (fastest). ‘<samp class="samp">epzs</samp>’ is an alias for
- ‘<samp class="samp">dia</samp>’.
- </p></dd>
- <dt>‘<samp class="samp">hex (<em class="emph">hex</em>)</samp>’</dt>
- <dd><p>Hexagonal search with radius 2.
- </p></dd>
- <dt>‘<samp class="samp">umh (<em class="emph">umh</em>)</samp>’</dt>
- <dd><p>Uneven multi-hexagon search.
- </p></dd>
- <dt>‘<samp class="samp">esa (<em class="emph">esa</em>)</samp>’</dt>
- <dd><p>Exhaustive search.
- </p></dd>
- <dt>‘<samp class="samp">tesa (<em class="emph">tesa</em>)</samp>’</dt>
- <dd><p>Hadamard exhaustive search (slowest).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">forced-idr</samp></dt>
- <dd><p>Normally, when forcing a I-frame type, the encoder can select any type
- of I-frame. This option forces it to choose an IDR-frame.
- </p>
- </dd>
- <dt><samp class="option">subq (<em class="emph">subme</em>)</samp></dt>
- <dd><p>Sub-pixel motion estimation method.
- </p>
- </dd>
- <dt><samp class="option">b_strategy (<em class="emph">b-adapt</em>)</samp></dt>
- <dd><p>Adaptive B-frame placement decision algorithm. Use only on first-pass.
- </p>
- </dd>
- <dt><samp class="option">keyint_min (<em class="emph">min-keyint</em>)</samp></dt>
- <dd><p>Minimum GOP size.
- </p>
- </dd>
- <dt><samp class="option">coder</samp></dt>
- <dd><p>Set entropy encoder. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">ac</samp>’</dt>
- <dd><p>Enable CABAC.
- </p>
- </dd>
- <dt>‘<samp class="samp">vlc</samp>’</dt>
- <dd><p>Enable CAVLC and disable CABAC. It generates the same effect as
- <code class="command">x264</code>’s <samp class="option">--no-cabac</samp> option.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">cmp</samp></dt>
- <dd><p>Set full pixel motion estimation comparison algorithm. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- <dd><p>Enable chroma in motion estimation.
- </p>
- </dd>
- <dt>‘<samp class="samp">sad</samp>’</dt>
- <dd><p>Ignore chroma in motion estimation. It generates the same effect as
- <code class="command">x264</code>’s <samp class="option">--no-chroma-me</samp> option.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">threads (<em class="emph">threads</em>)</samp></dt>
- <dd><p>Number of encoding threads.
- </p>
- </dd>
- <dt><samp class="option">thread_type</samp></dt>
- <dd><p>Set multithreading technique. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">slice</samp>’</dt>
- <dd><p>Slice-based multithreading. It generates the same effect as
- <code class="command">x264</code>’s <samp class="option">--sliced-threads</samp> option.
- </p></dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Frame-based multithreading.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>Set encoding flags. It can be used to disable closed GOP and enable
- open GOP by setting it to <code class="code">-cgop</code>. The result is similar to
- the behavior of <code class="command">x264</code>’s <samp class="option">--open-gop</samp> option.
- </p>
- </dd>
- <dt><samp class="option">rc_init_occupancy (<em class="emph">vbv-init</em>)</samp></dt>
- <dd><p>Initial VBV buffer occupancy
- </p>
- </dd>
- <dt><samp class="option">preset (<em class="emph">preset</em>)</samp></dt>
- <dd><p>Set the encoding preset.
- </p>
- </dd>
- <dt><samp class="option">tune (<em class="emph">tune</em>)</samp></dt>
- <dd><p>Set tuning of the encoding params.
- </p>
- </dd>
- <dt><samp class="option">profile (<em class="emph">profile</em>)</samp></dt>
- <dd><p>Set profile restrictions.
- </p>
- </dd>
- <dt><samp class="option">fastfirstpass</samp></dt>
- <dd><p>Enable fast settings when encoding first pass, when set to 1. When set
- to 0, it has the same effect of <code class="command">x264</code>’s
- <samp class="option">--slow-firstpass</samp> option.
- </p>
- </dd>
- <dt><samp class="option">crf (<em class="emph">crf</em>)</samp></dt>
- <dd><p>Set the quality for constant quality mode.
- </p>
- </dd>
- <dt><samp class="option">crf_max (<em class="emph">crf-max</em>)</samp></dt>
- <dd><p>In CRF mode, prevents VBV from lowering quality beyond this point.
- </p>
- </dd>
- <dt><samp class="option">qp (<em class="emph">qp</em>)</samp></dt>
- <dd><p>Set constant quantization rate control method parameter.
- </p>
- </dd>
- <dt><samp class="option">aq-mode (<em class="emph">aq-mode</em>)</samp></dt>
- <dd><p>Set AQ method. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none (<em class="emph">0</em>)</samp>’</dt>
- <dd><p>Disabled.
- </p>
- </dd>
- <dt>‘<samp class="samp">variance (<em class="emph">1</em>)</samp>’</dt>
- <dd><p>Variance AQ (complexity mask).
- </p>
- </dd>
- <dt>‘<samp class="samp">autovariance (<em class="emph">2</em>)</samp>’</dt>
- <dd><p>Auto-variance AQ (experimental).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">aq-strength (<em class="emph">aq-strength</em>)</samp></dt>
- <dd><p>Set AQ strength, reduce blocking and blurring in flat and textured areas.
- </p>
- </dd>
- <dt><samp class="option">psy</samp></dt>
- <dd><p>Use psychovisual optimizations when set to 1. When set to 0, it has the
- same effect as <code class="command">x264</code>’s <samp class="option">--no-psy</samp> option.
- </p>
- </dd>
- <dt><samp class="option">psy-rd (<em class="emph">psy-rd</em>)</samp></dt>
- <dd><p>Set strength of psychovisual optimization, in
- <var class="var">psy-rd</var>:<var class="var">psy-trellis</var> format.
- </p>
- </dd>
- <dt><samp class="option">rc-lookahead (<em class="emph">rc-lookahead</em>)</samp></dt>
- <dd><p>Set number of frames to look ahead for frametype and ratecontrol.
- </p>
- </dd>
- <dt><samp class="option">weightb</samp></dt>
- <dd><p>Enable weighted prediction for B-frames when set to 1. When set to 0,
- it has the same effect as <code class="command">x264</code>’s <samp class="option">--no-weightb</samp> option.
- </p>
- </dd>
- <dt><samp class="option">weightp (<em class="emph">weightp</em>)</samp></dt>
- <dd><p>Set weighted prediction method for P-frames. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none (<em class="emph">0</em>)</samp>’</dt>
- <dd><p>Disabled
- </p></dd>
- <dt>‘<samp class="samp">simple (<em class="emph">1</em>)</samp>’</dt>
- <dd><p>Enable only weighted refs
- </p></dd>
- <dt>‘<samp class="samp">smart (<em class="emph">2</em>)</samp>’</dt>
- <dd><p>Enable both weighted refs and duplicates
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">ssim (<em class="emph">ssim</em>)</samp></dt>
- <dd><p>Enable calculation and printing SSIM stats after the encoding.
- </p>
- </dd>
- <dt><samp class="option">intra-refresh (<em class="emph">intra-refresh</em>)</samp></dt>
- <dd><p>Enable the use of Periodic Intra Refresh instead of IDR frames when set
- to 1.
- </p>
- </dd>
- <dt><samp class="option">avcintra-class (<em class="emph">class</em>)</samp></dt>
- <dd><p>Configure the encoder to generate AVC-Intra.
- Valid values are 50, 100 and 200
- </p>
- </dd>
- <dt><samp class="option">bluray-compat (<em class="emph">bluray-compat</em>)</samp></dt>
- <dd><p>Configure the encoder to be compatible with the bluray standard.
- It is a shorthand for setting "bluray-compat=1 force-cfr=1".
- </p>
- </dd>
- <dt><samp class="option">b-bias (<em class="emph">b-bias</em>)</samp></dt>
- <dd><p>Set the influence on how often B-frames are used.
- </p>
- </dd>
- <dt><samp class="option">b-pyramid (<em class="emph">b-pyramid</em>)</samp></dt>
- <dd><p>Set method for keeping of some B-frames as references. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none (<em class="emph">none</em>)</samp>’</dt>
- <dd><p>Disabled.
- </p></dd>
- <dt>‘<samp class="samp">strict (<em class="emph">strict</em>)</samp>’</dt>
- <dd><p>Strictly hierarchical pyramid.
- </p></dd>
- <dt>‘<samp class="samp">normal (<em class="emph">normal</em>)</samp>’</dt>
- <dd><p>Non-strict (not Blu-ray compatible).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">mixed-refs</samp></dt>
- <dd><p>Enable the use of one reference per partition, as opposed to one
- reference per macroblock when set to 1. When set to 0, it has the
- same effect as <code class="command">x264</code>’s <samp class="option">--no-mixed-refs</samp> option.
- </p>
- </dd>
- <dt><samp class="option">8x8dct</samp></dt>
- <dd><p>Enable adaptive spatial transform (high profile 8x8 transform)
- when set to 1. When set to 0, it has the same effect as
- <code class="command">x264</code>’s <samp class="option">--no-8x8dct</samp> option.
- </p>
- </dd>
- <dt><samp class="option">fast-pskip</samp></dt>
- <dd><p>Enable early SKIP detection on P-frames when set to 1. When set
- to 0, it has the same effect as <code class="command">x264</code>’s
- <samp class="option">--no-fast-pskip</samp> option.
- </p>
- </dd>
- <dt><samp class="option">aud (<em class="emph">aud</em>)</samp></dt>
- <dd><p>Enable use of access unit delimiters when set to 1.
- </p>
- </dd>
- <dt><samp class="option">mbtree</samp></dt>
- <dd><p>Enable use macroblock tree ratecontrol when set to 1. When set
- to 0, it has the same effect as <code class="command">x264</code>’s
- <samp class="option">--no-mbtree</samp> option.
- </p>
- </dd>
- <dt><samp class="option">deblock (<em class="emph">deblock</em>)</samp></dt>
- <dd><p>Set loop filter parameters, in <var class="var">alpha</var>:<var class="var">beta</var> form.
- </p>
- </dd>
- <dt><samp class="option">cplxblur (<em class="emph">cplxblur</em>)</samp></dt>
- <dd><p>Set fluctuations reduction in QP (before curve compression).
- </p>
- </dd>
- <dt><samp class="option">partitions (<em class="emph">partitions</em>)</samp></dt>
- <dd><p>Set partitions to consider as a comma-separated list of values.
- Possible values in the list:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">p8x8</samp>’</dt>
- <dd><p>8x8 P-frame partition.
- </p></dd>
- <dt>‘<samp class="samp">p4x4</samp>’</dt>
- <dd><p>4x4 P-frame partition.
- </p></dd>
- <dt>‘<samp class="samp">b8x8</samp>’</dt>
- <dd><p>4x4 B-frame partition.
- </p></dd>
- <dt>‘<samp class="samp">i8x8</samp>’</dt>
- <dd><p>8x8 I-frame partition.
- </p></dd>
- <dt>‘<samp class="samp">i4x4</samp>’</dt>
- <dd><p>4x4 I-frame partition.
- (Enabling ‘<samp class="samp">p4x4</samp>’ requires ‘<samp class="samp">p8x8</samp>’ to be enabled. Enabling
- ‘<samp class="samp">i8x8</samp>’ requires adaptive spatial transform (<samp class="option">8x8dct</samp>
- option) to be enabled.)
- </p></dd>
- <dt>‘<samp class="samp">none (<em class="emph">none</em>)</samp>’</dt>
- <dd><p>Do not consider any partitions.
- </p></dd>
- <dt>‘<samp class="samp">all (<em class="emph">all</em>)</samp>’</dt>
- <dd><p>Consider every partition.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">direct-pred (<em class="emph">direct</em>)</samp></dt>
- <dd><p>Set direct MV prediction mode. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none (<em class="emph">none</em>)</samp>’</dt>
- <dd><p>Disable MV prediction.
- </p></dd>
- <dt>‘<samp class="samp">spatial (<em class="emph">spatial</em>)</samp>’</dt>
- <dd><p>Enable spatial predicting.
- </p></dd>
- <dt>‘<samp class="samp">temporal (<em class="emph">temporal</em>)</samp>’</dt>
- <dd><p>Enable temporal predicting.
- </p></dd>
- <dt>‘<samp class="samp">auto (<em class="emph">auto</em>)</samp>’</dt>
- <dd><p>Automatically decided.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">slice-max-size (<em class="emph">slice-max-size</em>)</samp></dt>
- <dd><p>Set the limit of the size of each slice in bytes. If not specified
- but RTP payload size (<samp class="option">ps</samp>) is specified, that is used.
- </p>
- </dd>
- <dt><samp class="option">stats (<em class="emph">stats</em>)</samp></dt>
- <dd><p>Set the file name for multi-pass stats.
- </p>
- </dd>
- <dt><samp class="option">nal-hrd (<em class="emph">nal-hrd</em>)</samp></dt>
- <dd><p>Set signal HRD information (requires <samp class="option">vbv-bufsize</samp> to be set).
- Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none (<em class="emph">none</em>)</samp>’</dt>
- <dd><p>Disable HRD information signaling.
- </p></dd>
- <dt>‘<samp class="samp">vbr (<em class="emph">vbr</em>)</samp>’</dt>
- <dd><p>Variable bit rate.
- </p></dd>
- <dt>‘<samp class="samp">cbr (<em class="emph">cbr</em>)</samp>’</dt>
- <dd><p>Constant bit rate (not allowed in MP4 container).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">x264opts <var class="var">opts</var></samp></dt>
- <dt><samp class="option">x264-params <var class="var">opts</var></samp></dt>
- <dd><p>Override the x264 configuration using a :-separated list of key=value
- options.
- </p>
- <p>The argument for both options is a list of <var class="var">key</var>=<var class="var">value</var>
- couples separated by ":". With <samp class="option">x264opts</samp> the value can be
- omitted, and the value <code class="code">1</code> is assumed in that case.
- </p>
- <p>For <var class="var">filter</var> and <var class="var">psy-rd</var> options values that use ":" as a
- separator themselves, use "," instead. They accept it as well since
- long ago but this is kept undocumented for some reason.
- </p>
- <p>For example, the options might be provided as:
- </p><div class="example">
- <pre class="example-preformatted">level=30:bframes=0:weightp=0:cabac=0:ref=1:vbv-maxrate=768:vbv-bufsize=2000:analyse=all:me=umh:no-fast-pskip=1:subq=6:8x8dct=0:trellis=0
- </pre></div>
- <p>For example to specify libx264 encoding options with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i foo.mpg -c:v libx264 -x264opts keyint=123:min-keyint=20 -an out.mkv
- </pre></div>
- <p>To get the complete list of the libx264 options, invoke the command
- <code class="command">x264 --fullhelp</code> or consult the libx264 documentation.
- </p>
- </dd>
- <dt><samp class="option">a53cc <var class="var">boolean</var></samp></dt>
- <dd><p>Import closed captions (which must be ATSC compatible format) into output.
- Only the mpeg2 and h264 decoders provide these. Default is 1 (on).
- </p>
- </dd>
- <dt><samp class="option">udu_sei <var class="var">boolean</var></samp></dt>
- <dd><p>Import user data unregistered SEI if available into output. Default is 0 (off).
- </p>
- </dd>
- <dt><samp class="option">mb_info <var class="var">boolean</var></samp></dt>
- <dd><p>Set mb_info data through AVFrameSideData, only useful when used from the
- API. Default is 0 (off).
- </p></dd>
- </dl>
- <p>Encoding ffpresets for common usages are provided so they can be used with the
- general presets system (e.g. passing the <samp class="option">pre</samp> option).
- </p>
- <a name="libx265"></a>
- <h3 class="section">16.20 libx265<span class="pull-right"><a class="anchor hidden-xs" href="#libx265" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libx265" aria-hidden="true">TOC</a></span></h3>
- <p>x265 H.265/HEVC encoder wrapper.
- </p>
- <p>This encoder requires the presence of the libx265 headers and library
- during configuration. You need to explicitly configure the build with
- <samp class="option">--enable-libx265</samp>.
- </p>
- <a name="Options-43"></a>
- <h4 class="subsection">16.20.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-43" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-43" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Sets target video bitrate.
- </p>
- </dd>
- <dt><samp class="option">bf</samp></dt>
- <dt><samp class="option">g</samp></dt>
- <dd><p>Set the GOP size.
- </p>
- </dd>
- <dt><samp class="option">keyint_min</samp></dt>
- <dd><p>Minimum GOP size.
- </p>
- </dd>
- <dt><samp class="option">refs</samp></dt>
- <dd><p>Number of reference frames each P-frame can use. The range is from <var class="var">1-16</var>.
- </p>
- </dd>
- <dt><samp class="option">preset</samp></dt>
- <dd><p>Set the x265 preset.
- </p>
- </dd>
- <dt><samp class="option">tune</samp></dt>
- <dd><p>Set the x265 tune parameter.
- </p>
- </dd>
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Set profile restrictions.
- </p>
- </dd>
- <dt><samp class="option">crf</samp></dt>
- <dd><p>Set the quality for constant quality mode.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set constant quantization rate control method parameter.
- </p>
- </dd>
- <dt><samp class="option">qmin</samp></dt>
- <dd><p>Minimum quantizer scale.
- </p>
- </dd>
- <dt><samp class="option">qmax</samp></dt>
- <dd><p>Maximum quantizer scale.
- </p>
- </dd>
- <dt><samp class="option">qdiff</samp></dt>
- <dd><p>Maximum difference between quantizer scales.
- </p>
- </dd>
- <dt><samp class="option">qblur</samp></dt>
- <dd><p>Quantizer curve blur
- </p>
- </dd>
- <dt><samp class="option">qcomp</samp></dt>
- <dd><p>Quantizer curve compression factor
- </p>
- </dd>
- <dt><samp class="option">i_qfactor</samp></dt>
- <dt><samp class="option">b_qfactor</samp></dt>
- <dt><samp class="option">forced-idr</samp></dt>
- <dd><p>Normally, when forcing a I-frame type, the encoder can select any type
- of I-frame. This option forces it to choose an IDR-frame.
- </p>
- </dd>
- <dt><samp class="option">x265-stats</samp></dt>
- <dd><p>Specify the file name for 2-pass stats. This is set automatically when using
- the <samp class="option">-passlogfile</samp> option.
- </p>
- </dd>
- <dt><samp class="option">udu_sei <var class="var">boolean</var></samp></dt>
- <dd><p>Import user data unregistered SEI if available into output. Default is 0 (off).
- </p>
- </dd>
- <dt><samp class="option">x265-params</samp></dt>
- <dd><p>Set x265 options using a list of <var class="var">key</var>=<var class="var">value</var> couples separated
- by ":". See <code class="command">x265 --help</code> for a list of options.
- </p>
- <p>For example to specify libx265 encoding options with <samp class="option">-x265-params</samp>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -c:v libx265 -x265-params crf=26:psy-rd=1 output.mp4
- </pre></div>
- </dd>
- </dl>
- <a name="libxavs2"></a>
- <h3 class="section">16.21 libxavs2<span class="pull-right"><a class="anchor hidden-xs" href="#libxavs2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libxavs2" aria-hidden="true">TOC</a></span></h3>
- <p>xavs2 AVS2-P2/IEEE1857.4 encoder wrapper.
- </p>
- <p>This encoder requires the presence of the libxavs2 headers and library
- during configuration. You need to explicitly configure the build with
- <samp class="option">--enable-libxavs2</samp>.
- </p>
- <p>The following standard libavcodec options are used:
- </p><ul class="itemize mark-bullet">
- <li><samp class="option">b</samp> / <samp class="option">bit_rate</samp>
- </li><li><samp class="option">g</samp> / <samp class="option">gop_size</samp>
- </li><li><samp class="option">bf</samp> / <samp class="option">max_b_frames</samp>
- </li></ul>
- <p>The encoder also has its own specific options:
- </p><a name="Options-44"></a>
- <h4 class="subsection">16.21.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-44" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-44" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">lcu_row_threads</samp></dt>
- <dd><p>Set the number of parallel threads for rows from 1 to 8 (default 5).
- </p>
- </dd>
- <dt><samp class="option">initial_qp</samp></dt>
- <dd><p>Set the xavs2 quantization parameter from 1 to 63 (default 34). This is
- used to set the initial qp for the first frame.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set the xavs2 quantization parameter from 1 to 63 (default 34). This is
- used to set the qp value under constant-QP mode.
- </p>
- </dd>
- <dt><samp class="option">max_qp</samp></dt>
- <dd><p>Set the max qp for rate control from 1 to 63 (default 55).
- </p>
- </dd>
- <dt><samp class="option">min_qp</samp></dt>
- <dd><p>Set the min qp for rate control from 1 to 63 (default 20).
- </p>
- </dd>
- <dt><samp class="option">speed_level</samp></dt>
- <dd><p>Set the Speed level from 0 to 9 (default 0). Higher is better but slower.
- </p>
- </dd>
- <dt><samp class="option">log_level</samp></dt>
- <dd><p>Set the log level from -1 to 3 (default 0). -1: none, 0: error,
- 1: warning, 2: info, 3: debug.
- </p>
- </dd>
- <dt><samp class="option">xavs2-params</samp></dt>
- <dd><p>Set xavs2 options using a list of <var class="var">key</var>=<var class="var">value</var> couples separated
- by ":".
- </p>
- <p>For example to specify libxavs2 encoding options with <samp class="option">-xavs2-params</samp>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -c:v libxavs2 -xavs2-params RdoqLevel=0 output.avs2
- </pre></div>
- </dd>
- </dl>
- <a name="libxeve"></a>
- <h3 class="section">16.22 libxeve<span class="pull-right"><a class="anchor hidden-xs" href="#libxeve" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libxeve" aria-hidden="true">TOC</a></span></h3>
- <p>eXtra-fast Essential Video Encoder (XEVE) MPEG-5 EVC encoder wrapper.
- The xeve-equivalent options or values are listed in parentheses for easy migration.
- </p>
- <p>This encoder requires the presence of the libxeve headers and library
- during configuration. You need to explicitly configure the build with
- <samp class="option">--enable-libxeve</samp>.
- </p>
- <div class="info">
- <p>Many libxeve encoder options are mapped to FFmpeg global codec options,
- while unique encoder options are provided through private options.
- Additionally the xeve-params private options allows one to pass a list
- of key=value tuples as accepted by the libxeve <code class="code">parse_xeve_params</code> function.
- </p></div>
- <p>The xeve project website is at <a class="url" href="https://github.com/mpeg5/xeve">https://github.com/mpeg5/xeve</a>.
- </p>
- <a name="Options-45"></a>
- <h4 class="subsection">16.22.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-45" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-45" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libxeve wrapper.
- The xeve-equivalent options or values are listed in parentheses for easy migration.
- </p>
- <div class="info">
- <p>To reduce the duplication of documentation, only the private options
- and some others requiring special attention are documented here. For
- the documentation of the undocumented generic options, see
- <a class="ref" href="#codec_002doptions">the Codec Options chapter</a>.
- </p></div>
- <div class="info">
- <p>To get a more accurate and extensive documentation of the libxeve options,
- invoke the command <code class="code">xeve_app --help</code> or consult the libxeve documentation.
- </p></div>
- <dl class="table">
- <dt><samp class="option">b (<em class="emph">bitrate</em>)</samp></dt>
- <dd><p>Set target video bitrate in bits/s.
- Note that FFmpeg’s b option is expressed in bits/s, while xeve’s bitrate is in kilobits/s.
- </p>
- </dd>
- <dt><samp class="option">bf (<em class="emph">bframes</em>)</samp></dt>
- <dd><p>Set the maximum number of B frames (1,3,7,15).
- </p>
- </dd>
- <dt><samp class="option">g (<em class="emph">keyint</em>)</samp></dt>
- <dd><p>Set the GOP size (I-picture period).
- </p>
- </dd>
- <dt><samp class="option">preset (<em class="emph">preset</em>)</samp></dt>
- <dd><p>Set the xeve preset.
- Set the encoder preset value to determine encoding speed [fast, medium, slow, placebo]
- </p>
- </dd>
- <dt><samp class="option">tune (<em class="emph">tune</em>)</samp></dt>
- <dd><p>Set the encoder tune parameter [psnr, zerolatency]
- </p>
- </dd>
- <dt><samp class="option">profile (<em class="emph">profile</em>)</samp></dt>
- <dd><p>Set the encoder profile [0: baseline; 1: main]
- </p>
- </dd>
- <dt><samp class="option">crf (<em class="emph">crf</em>)</samp></dt>
- <dd><p>Set the quality for constant quality mode.
- Constant rate factor <10..49> [default: 32]
- </p>
- </dd>
- <dt><samp class="option">qp (<em class="emph">qp</em>)</samp></dt>
- <dd><p>Set constant quantization rate control method parameter.
- Quantization parameter qp <0..51> [default: 32]
- </p>
- </dd>
- <dt><samp class="option">threads (<em class="emph">threads</em>)</samp></dt>
- <dd><p>Force to use a specific number of threads
- </p>
- </dd>
- </dl>
- <a name="libxvid"></a>
- <h3 class="section">16.23 libxvid<span class="pull-right"><a class="anchor hidden-xs" href="#libxvid" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libxvid" aria-hidden="true">TOC</a></span></h3>
- <p>Xvid MPEG-4 Part 2 encoder wrapper.
- </p>
- <p>This encoder requires the presence of the libxvidcore headers and library
- during configuration. You need to explicitly configure the build with
- <code class="code">--enable-libxvid --enable-gpl</code>.
- </p>
- <p>The native <code class="code">mpeg4</code> encoder supports the MPEG-4 Part 2 format, so
- users can encode to this format without this library.
- </p>
- <a name="Options-46"></a>
- <h4 class="subsection">16.23.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-46" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-46" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported by the libxvid wrapper. Some of
- the following options are listed but are not documented, and
- correspond to shared codec options. See <a class="ref" href="#codec_002doptions">the Codec
- Options chapter</a> for their documentation. The other shared options
- which are not listed have no effect for the libxvid encoder.
- </p>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dt><samp class="option">g</samp></dt>
- <dt><samp class="option">qmin</samp></dt>
- <dt><samp class="option">qmax</samp></dt>
- <dt><samp class="option">mpeg_quant</samp></dt>
- <dt><samp class="option">threads</samp></dt>
- <dt><samp class="option">bf</samp></dt>
- <dt><samp class="option">b_qfactor</samp></dt>
- <dt><samp class="option">b_qoffset</samp></dt>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>Set specific encoding flags. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">mv4</samp>’</dt>
- <dd><p>Use four motion vector by macroblock.
- </p>
- </dd>
- <dt>‘<samp class="samp">aic</samp>’</dt>
- <dd><p>Enable high quality AC prediction.
- </p>
- </dd>
- <dt>‘<samp class="samp">gray</samp>’</dt>
- <dd><p>Only encode grayscale.
- </p>
- </dd>
- <dt>‘<samp class="samp">qpel</samp>’</dt>
- <dd><p>Enable quarter-pixel motion compensation.
- </p>
- </dd>
- <dt>‘<samp class="samp">cgop</samp>’</dt>
- <dd><p>Enable closed GOP.
- </p>
- </dd>
- <dt>‘<samp class="samp">global_header</samp>’</dt>
- <dd><p>Place global headers in extradata instead of every keyframe.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">gmc</samp></dt>
- <dd><p>Enable the use of global motion compensation (GMC). Default is 0
- (disabled).
- </p>
- </dd>
- <dt><samp class="option">me_quality</samp></dt>
- <dd><p>Set motion estimation quality level. Possible values in decreasing order of
- speed and increasing order of quality:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>Use no motion estimation (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">1, 2</samp>’</dt>
- <dd><p>Enable advanced diamond zonal search for 16x16 blocks and half-pixel
- refinement for 16x16 blocks.
- </p>
- </dd>
- <dt>‘<samp class="samp">3, 4</samp>’</dt>
- <dd><p>Enable all of the things described above, plus advanced diamond zonal
- search for 8x8 blocks and half-pixel refinement for 8x8 blocks, also
- enable motion estimation on chroma planes for P and B-frames.
- </p>
- </dd>
- <dt>‘<samp class="samp">5, 6</samp>’</dt>
- <dd><p>Enable all of the things described above, plus extended 16x16 and 8x8
- blocks search.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">mbd</samp></dt>
- <dd><p>Set macroblock decision algorithm. Possible values in the increasing
- order of quality:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dd><p>Use macroblock comparing function algorithm (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">bits</samp>’</dt>
- <dd><p>Enable rate distortion-based half pixel and quarter pixel refinement for
- 16x16 blocks.
- </p>
- </dd>
- <dt>‘<samp class="samp">rd</samp>’</dt>
- <dd><p>Enable all of the things described above, plus rate distortion-based
- half pixel and quarter pixel refinement for 8x8 blocks, and rate
- distortion-based search using square pattern.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">lumi_aq</samp></dt>
- <dd><p>Enable lumi masking adaptive quantization when set to 1. Default is 0
- (disabled).
- </p>
- </dd>
- <dt><samp class="option">variance_aq</samp></dt>
- <dd><p>Enable variance adaptive quantization when set to 1. Default is 0
- (disabled).
- </p>
- <p>When combined with <samp class="option">lumi_aq</samp>, the resulting quality will not
- be better than any of the two specified individually. In other
- words, the resulting quality will be the worse one of the two
- effects.
- </p>
- </dd>
- <dt><samp class="option">trellis</samp></dt>
- <dd><p>Set rate-distortion optimal quantization.
- </p>
- </dd>
- <dt><samp class="option">ssim</samp></dt>
- <dd><p>Set structural similarity (SSIM) displaying method. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">off</samp>’</dt>
- <dd><p>Disable displaying of SSIM information.
- </p>
- </dd>
- <dt>‘<samp class="samp">avg</samp>’</dt>
- <dd><p>Output average SSIM at the end of encoding to stdout. The format of
- showing the average SSIM is:
- </p>
- <div class="example">
- <pre class="example-preformatted">Average SSIM: %f
- </pre></div>
- <p>For users who are not familiar with C, %f means a float number, or
- a decimal (e.g. 0.939232).
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Output both per-frame SSIM data during encoding and average SSIM at
- the end of encoding to stdout. The format of per-frame information
- is:
- </p>
- <div class="example">
- <pre class="example-preformatted"> SSIM: avg: %1.3f min: %1.3f max: %1.3f
- </pre></div>
- <p>For users who are not familiar with C, %1.3f means a float number
- rounded to 3 digits after the dot (e.g. 0.932).
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">ssim_acc</samp></dt>
- <dd><p>Set SSIM accuracy. Valid options are integers within the range of
- 0-4, while 0 gives the most accurate result and 4 computes the
- fastest.
- </p>
- </dd>
- </dl>
- <a name="MediaCodec"></a>
- <h3 class="section">16.24 MediaCodec<span class="pull-right"><a class="anchor hidden-xs" href="#MediaCodec" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-MediaCodec" aria-hidden="true">TOC</a></span></h3>
- <p>MediaCodec encoder wrapper enables hardware-accelerated video encoding on
- Android device. It supports H.264, H.265 (HEVC), VP8, VP9, MPEG-4, and AV1
- encoding (whether works or not is device dependent).
- </p>
- <p>Android provides two sets of APIs: Java MediaCodec and NDK MediaCodec. The
- MediaCodec encoder wrapper supports both. Note that the NDK MediaCodec API
- operates without requiring JVM, but may fail to function outside the JVM
- environment due to dependencies on system framework services, particularly
- after Android 15.
- </p>
- <dl class="table">
- <dt><samp class="option">ndk_codec <var class="var">boolean</var></samp></dt>
- <dd><p>Use the NDK-based MediaCodec API instead of the Java API. Enabled by default
- if <code class="code">av_jni_get_java_vm()</code> return NULL.
- </p>
- </dd>
- <dt><samp class="option">ndk_async <var class="var">boolean</var></samp></dt>
- <dd><p>Use NDK MediaCodec in async mode. Async mode has less overhead than poll in a
- loop in sync mode. The drawback of async mode is AV_CODEC_FLAG_GLOBAL_HEADER
- doesn’t work (use extract_extradata bsf when necessary). It doesn’t work and
- will be disabled automatically on devices below Android 8.0.
- </p>
- </dd>
- <dt><samp class="option">codec_name <var class="var">string</var></samp></dt>
- <dd><p>A codec type can have multiple implementations on a single device, this option
- specify which backend to use (via MediaCodec createCodecByName API). It’s NULL
- by default, and encoder is created by createEncoderByType.
- </p>
- </dd>
- <dt><samp class="option">bitrate_mode <var class="var">integer</var></samp></dt>
- <dd>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">cq</samp>’</dt>
- <dd><p>Constant quality mode
- </p></dd>
- <dt>‘<samp class="samp">vbr</samp>’</dt>
- <dd><p>Variable bitrate mode
- </p></dd>
- <dt>‘<samp class="samp">cbr</samp>’</dt>
- <dd><p>Constant bitrate mode
- </p></dd>
- <dt>‘<samp class="samp">cbr_fd</samp>’</dt>
- <dd><p>Constant bitrate mode with frame drops
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">pts_as_dts <var class="var">boolean</var></samp></dt>
- <dd><p>Use PTS as DTS. This is a workaround since MediaCodec API doesn’t provide
- decoding timestamp. It is enabled automatically if B frame is 0.
- </p>
- </dd>
- <dt><samp class="option">operating_rate <var class="var">integer</var></samp></dt>
- <dd><p>The desired operating rate that the codec will need to operate at, zero for
- unspecified. This is used for cases like high-speed/slow-motion video capture,
- where the video encoder format contains the target playback rate (e.g. 30fps),
- but the component must be able to handle the high operating capture rate (e.g.
- 240fps). This rate will be used by codec for resource planning and setting the
- operating points.
- </p>
- </dd>
- <dt><samp class="option">qp_i_min <var class="var">integer</var></samp></dt>
- <dd><p>Minimum quantization parameter for I frame.
- </p></dd>
- <dt><samp class="option">qp_p_min <var class="var">integer</var></samp></dt>
- <dd><p>Minimum quantization parameter for P frame.
- </p></dd>
- <dt><samp class="option">qp_b_min <var class="var">integer</var></samp></dt>
- <dd><p>Minimum quantization parameter for B frame.
- </p></dd>
- <dt><samp class="option">qp_i_max <var class="var">integer</var></samp></dt>
- <dd><p>Maximum quantization parameter for I frame.
- </p></dd>
- <dt><samp class="option">qp_p_max <var class="var">integer</var></samp></dt>
- <dd><p>Maximum quantization parameter for P frame.
- </p></dd>
- <dt><samp class="option">qp_b_max <var class="var">integer</var></samp></dt>
- <dd><p>Maximum quantization parameter for B frame.
- </p>
- </dd>
- </dl>
- <a name="MediaFoundation"></a>
- <h3 class="section">16.25 MediaFoundation<span class="pull-right"><a class="anchor hidden-xs" href="#MediaFoundation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-MediaFoundation" aria-hidden="true">TOC</a></span></h3>
- <p>The following wrappers for encoders in the MediaFoundation framework are
- available:
- </p>
- <ul class="itemize mark-bullet">
- <li>h264_mf
- </li><li>hevc_mf
- </li><li>av1_mf
- </li></ul>
- <p>These support both software and hardware encoding.
- </p>
- <p>Video encoders can take input in either of nv12 or yuv420p form
- (some encoders support both, some support only either - in practice,
- nv12 is the safer choice, especially among HW encoders).
- </p>
- <p>Hardware-accelerated encoding requires D3D11, including hardware
- scaling capabilities through the scale_d3d11 filter.
- </p>
- <p>To list all available options for the MediaFoundation encoders, use:
- <code class="command">ffmpeg -h encoder=<encoder></code> e.g. <code class="command">ffmpeg -h encoder=h264_mf</code>
- </p>
- <a name="Options-47"></a>
- <h4 class="subsection">16.25.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-47" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-47" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">rate_control</samp></dt>
- <dd><p>Select rate control mode. Available modes:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>Default mode
- </p></dd>
- <dt>‘<samp class="samp">cbr</samp>’</dt>
- <dd><p>CBR mode
- </p></dd>
- <dt>‘<samp class="samp">pc_vbr</samp>’</dt>
- <dd><p>Peak constrained VBR mode
- </p></dd>
- <dt>‘<samp class="samp">u_vbr</samp>’</dt>
- <dd><p>Unconstrained VBR mode
- </p></dd>
- <dt>‘<samp class="samp">quality</samp>’</dt>
- <dd><p>Quality mode
- </p></dd>
- <dt>‘<samp class="samp">ld_vbr</samp>’</dt>
- <dd><p>Low delay VBR mode (requires Windows 8+)
- </p></dd>
- <dt>‘<samp class="samp">g_vbr</samp>’</dt>
- <dd><p>Global VBR mode (requires Windows 8+)
- </p></dd>
- <dt>‘<samp class="samp">gld_vbr</samp>’</dt>
- <dd><p>Global low delay VBR mode (requires Windows 8+)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">scenario</samp></dt>
- <dd><p>Select usage scenario. Available scenarios:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>Default scenario
- </p></dd>
- <dt>‘<samp class="samp">display_remoting</samp>’</dt>
- <dd><p>Display remoting scenario
- </p></dd>
- <dt>‘<samp class="samp">video_conference</samp>’</dt>
- <dd><p>Video conference scenario
- </p></dd>
- <dt>‘<samp class="samp">archive</samp>’</dt>
- <dd><p>Archive scenario
- </p></dd>
- <dt>‘<samp class="samp">live_streaming</samp>’</dt>
- <dd><p>Live streaming scenario
- </p></dd>
- <dt>‘<samp class="samp">camera_record</samp>’</dt>
- <dd><p>Camera record scenario
- </p></dd>
- <dt>‘<samp class="samp">display_remoting_with_feature_map</samp>’</dt>
- <dd><p>Display remoting with feature map scenario
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">quality</samp></dt>
- <dd><p>Set encoding quality (0-100). -1 means default quality.
- </p>
- </dd>
- <dt><samp class="option">hw_encoding</samp></dt>
- <dd><p>Force hardware encoding (0-1). Default is 0 (disabled).
- </p>
- </dd>
- </dl>
- <a name="Examples-6"></a>
- <h4 class="subsection">16.25.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-6" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-6" aria-hidden="true">TOC</a></span></h4>
- <p>Hardware encoding:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp4 -c:v h264_mf -hw_encoding 1 output.mp4
- </pre></div>
- <p>Hardware-accelerated decoding with hardware encoding:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -hwaccel d3d11va -i input.mp4 -c:v h264_mf -hw_encoding 1 output.mp4
- </pre></div>
- <p>Hardware-accelerated decoding, HW scaling and encoding with quality setting:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -hwaccel d3d11va -hwaccel_output_format d3d11 -i input.mp4 -vf scale_d3d11=1920:1080 -c:v hevc_mf -hw_encoding 1 -quality 80 output.mp4
- </pre></div>
- <a name="Microsoft-RLE"></a>
- <h3 class="section">16.26 Microsoft RLE<span class="pull-right"><a class="anchor hidden-xs" href="#Microsoft-RLE" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Microsoft-RLE" aria-hidden="true">TOC</a></span></h3>
- <p>Microsoft RLE aka MSRLE encoder.
- Only 8-bit palette mode supported.
- Compatible with Windows 3.1 and Windows 95.
- </p>
- <a name="Options-48"></a>
- <h4 class="subsection">16.26.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-48" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-48" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">g <var class="var">integer</var></samp></dt>
- <dd><p>Keyframe interval.
- A keyframe is inserted at least every <code class="code">-g</code> frames, sometimes sooner.
- </p></dd>
- </dl>
- <a name="mpeg2"></a>
- <h3 class="section">16.27 mpeg2<span class="pull-right"><a class="anchor hidden-xs" href="#mpeg2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpeg2" aria-hidden="true">TOC</a></span></h3>
- <p>MPEG-2 video encoder.
- </p>
- <a name="Options-49"></a>
- <h4 class="subsection">16.27.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-49" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-49" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Select the mpeg2 profile to encode:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">422</samp>’</dt>
- <dt>‘<samp class="samp">high</samp>’</dt>
- <dt>‘<samp class="samp">ss</samp>’</dt>
- <dd><p>Spatially Scalable
- </p></dd>
- <dt>‘<samp class="samp">snr</samp>’</dt>
- <dd><p>SNR Scalable
- </p></dd>
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">simple</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Select the mpeg2 level to encode:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">high</samp>’</dt>
- <dt>‘<samp class="samp">high1440</samp>’</dt>
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">low</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">seq_disp_ext <var class="var">integer</var></samp></dt>
- <dd><p>Specifies if the encoder should write a sequence_display_extension to the
- output.
- </p><dl class="table">
- <dt><samp class="option">-1</samp></dt>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Decide automatically to write it or not (this is the default) by checking if
- the data to be written is different from the default or unspecified values.
- </p></dd>
- <dt><samp class="option">0</samp></dt>
- <dt><samp class="option">never</samp></dt>
- <dd><p>Never write it.
- </p></dd>
- <dt><samp class="option">1</samp></dt>
- <dt><samp class="option">always</samp></dt>
- <dd><p>Always write it.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">video_format <var class="var">integer</var></samp></dt>
- <dd><p>Specifies the video_format written into the sequence display extension
- indicating the source of the video pictures. The default is ‘<samp class="samp">unspecified</samp>’,
- can be ‘<samp class="samp">component</samp>’, ‘<samp class="samp">pal</samp>’, ‘<samp class="samp">ntsc</samp>’, ‘<samp class="samp">secam</samp>’ or ‘<samp class="samp">mac</samp>’.
- For maximum compatibility, use ‘<samp class="samp">component</samp>’.
- </p></dd>
- <dt><samp class="option">a53cc <var class="var">boolean</var></samp></dt>
- <dd><p>Import closed captions (which must be ATSC compatible format) into output.
- Default is 1 (on).
- </p></dd>
- </dl>
- <a name="png"></a>
- <h3 class="section">16.28 png<span class="pull-right"><a class="anchor hidden-xs" href="#png" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-png" aria-hidden="true">TOC</a></span></h3>
- <p>PNG image encoder.
- </p>
- <a name="Options-50"></a>
- <h4 class="subsection">16.28.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-50" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-50" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">compression_level</samp></dt>
- <dd><p>Sets the compression level, from 0 to 9(default)
- </p></dd>
- </dl>
- <a name="Private-options-1"></a>
- <h4 class="subsection">16.28.2 Private options<span class="pull-right"><a class="anchor hidden-xs" href="#Private-options-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Private-options-1" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">dpi <var class="var">integer</var></samp></dt>
- <dd><p>Set physical density of pixels, in dots per inch, unset by default
- </p></dd>
- <dt><samp class="option">dpm <var class="var">integer</var></samp></dt>
- <dd><p>Set physical density of pixels, in dots per meter, unset by default
- </p></dd>
- <dt><samp class="option">pred <var class="var">method</var></samp></dt>
- <dd><p>Set prediction method (none, sub, up, avg, paeth, mixed), default is paeth
- </p></dd>
- </dl>
- <a name="ProRes"></a>
- <h3 class="section">16.29 ProRes<span class="pull-right"><a class="anchor hidden-xs" href="#ProRes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ProRes" aria-hidden="true">TOC</a></span></h3>
- <p>Apple ProRes encoder.
- </p>
- <p>FFmpeg contains 2 ProRes encoders, the prores-aw and prores-ks encoder.
- The used encoder can be chosen with the <code class="code">-vcodec</code> option.
- </p>
- <a name="Private-Options-for-prores_002dks"></a>
- <h4 class="subsection">16.29.1 Private Options for prores-ks<span class="pull-right"><a class="anchor hidden-xs" href="#Private-Options-for-prores_002dks" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Private-Options-for-prores_002dks" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">profile <var class="var">integer</var></samp></dt>
- <dd><p>Select the ProRes profile to encode
- </p><dl class="table">
- <dt>‘<samp class="samp">proxy</samp>’</dt>
- <dt>‘<samp class="samp">lt</samp>’</dt>
- <dt>‘<samp class="samp">standard</samp>’</dt>
- <dt>‘<samp class="samp">hq</samp>’</dt>
- <dt>‘<samp class="samp">4444</samp>’</dt>
- <dt>‘<samp class="samp">4444xq</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">quant_mat <var class="var">integer</var></samp></dt>
- <dd><p>Select quantization matrix.
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dt>‘<samp class="samp">proxy</samp>’</dt>
- <dt>‘<samp class="samp">lt</samp>’</dt>
- <dt>‘<samp class="samp">standard</samp>’</dt>
- <dt>‘<samp class="samp">hq</samp>’</dt>
- </dl>
- <p>If set to <var class="var">auto</var>, the matrix matching the profile will be picked.
- If not set, the matrix providing the highest quality, <var class="var">default</var>, will be
- picked.
- </p>
- </dd>
- <dt><samp class="option">bits_per_mb <var class="var">integer</var></samp></dt>
- <dd><p>How many bits to allot for coding one macroblock. Different profiles use
- between 200 and 2400 bits per macroblock, the maximum is 8000.
- </p>
- </dd>
- <dt><samp class="option">mbs_per_slice <var class="var">integer</var></samp></dt>
- <dd><p>Number of macroblocks in each slice (1-8); the default value (8)
- should be good in almost all situations.
- </p>
- </dd>
- <dt><samp class="option">vendor <var class="var">string</var></samp></dt>
- <dd><p>Override the 4-byte vendor ID.
- A custom vendor ID like <var class="var">apl0</var> would claim the stream was produced by
- the Apple encoder.
- </p>
- </dd>
- <dt><samp class="option">alpha_bits <var class="var">integer</var></samp></dt>
- <dd><p>Specify number of bits for alpha component.
- Possible values are <var class="var">0</var>, <var class="var">8</var> and <var class="var">16</var>.
- Use <var class="var">0</var> to disable alpha plane coding.
- </p>
- </dd>
- </dl>
- <a name="Speed-considerations"></a>
- <h4 class="subsection">16.29.2 Speed considerations<span class="pull-right"><a class="anchor hidden-xs" href="#Speed-considerations" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Speed-considerations" aria-hidden="true">TOC</a></span></h4>
- <p>In the default mode of operation the encoder has to honor frame constraints
- (i.e. not produce frames with size bigger than requested) while still making
- output picture as good as possible.
- A frame containing a lot of small details is harder to compress and the encoder
- would spend more time searching for appropriate quantizers for each slice.
- </p>
- <p>Setting a higher <samp class="option">bits_per_mb</samp> limit will improve the speed.
- </p>
- <p>For the fastest encoding speed set the <samp class="option">qscale</samp> parameter (4 is the
- recommended value) and do not set a size constraint.
- </p>
- <a name="QSV-Encoders"></a>
- <h3 class="section">16.30 QSV Encoders<span class="pull-right"><a class="anchor hidden-xs" href="#QSV-Encoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-QSV-Encoders" aria-hidden="true">TOC</a></span></h3>
- <p>The family of Intel QuickSync Video encoders (MPEG-2, H.264, HEVC, JPEG/MJPEG,
- VP9, AV1)
- </p>
- <a name="Ratecontrol-Method"></a>
- <h4 class="subsection">16.30.1 Ratecontrol Method<span class="pull-right"><a class="anchor hidden-xs" href="#Ratecontrol-Method" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Ratecontrol-Method" aria-hidden="true">TOC</a></span></h4>
- <p>The ratecontrol method is selected as follows:
- </p><ul class="itemize mark-bullet">
- <li>When <samp class="option">global_quality</samp> is specified, a quality-based mode is used.
- Specifically this means either
- <ul class="itemize mark-minus">
- <li><var class="var">CQP</var> - constant quantizer scale, when the <samp class="option">qscale</samp> codec flag is
- also set (the <samp class="option">-qscale</samp> ffmpeg option).
- </li><li><var class="var">LA_ICQ</var> - intelligent constant quality with lookahead, when the
- <samp class="option">look_ahead</samp> option is also set.
- </li><li><var class="var">ICQ</var> – intelligent constant quality otherwise. For the ICQ modes, global
- quality range is 1 to 51, with 1 being the best quality.
- </li></ul>
- </li><li>Otherwise when the desired average bitrate is specified with the <samp class="option">b</samp>
- option, a bitrate-based mode is used.
- <ul class="itemize mark-minus">
- <li><var class="var">LA</var> - VBR with lookahead, when the <samp class="option">look_ahead</samp> option is specified.
- </li><li><var class="var">VCM</var> - video conferencing mode, when the <samp class="option">vcm</samp> option is set.
- </li><li><var class="var">CBR</var> - constant bitrate, when <samp class="option">maxrate</samp> is specified and equal to
- the average bitrate.
- </li><li><var class="var">VBR</var> - variable bitrate, when <samp class="option">maxrate</samp> is specified, but is higher
- than the average bitrate.
- </li><li><var class="var">AVBR</var> - average VBR mode, when <samp class="option">maxrate</samp> is not specified, both
- <samp class="option">avbr_accuracy</samp> and <samp class="option">avbr_convergence</samp> are set to non-zero. This
- mode is available for H264 and HEVC on Windows.
- </li></ul>
- </li><li>Otherwise the default ratecontrol method <var class="var">CQP</var> is used.
- </li></ul>
- <p>Note that depending on your system, a different mode than the one you specified
- may be selected by the encoder. Set the verbosity level to <var class="var">verbose</var> or
- higher to see the actual settings used by the QSV runtime.
- </p>
- <a name="Global-Options-_002d_003e-MSDK-Options"></a>
- <h4 class="subsection">16.30.2 Global Options -> MSDK Options<span class="pull-right"><a class="anchor hidden-xs" href="#Global-Options-_002d_003e-MSDK-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Global-Options-_002d_003e-MSDK-Options" aria-hidden="true">TOC</a></span></h4>
- <p>Additional libavcodec global options are mapped to MSDK options as follows:
- </p>
- <ul class="itemize mark-bullet">
- <li><samp class="option">g/gop_size</samp> -> <samp class="option">GopPicSize</samp>
- </li><li><samp class="option">bf/max_b_frames</samp>+1 -> <samp class="option">GopRefDist</samp>
- </li><li><samp class="option">rc_init_occupancy/rc_initial_buffer_occupancy</samp> ->
- <samp class="option">InitialDelayInKB</samp>
- </li><li><samp class="option">slices</samp> -> <samp class="option">NumSlice</samp>
- </li><li><samp class="option">refs</samp> -> <samp class="option">NumRefFrame</samp>
- </li><li><samp class="option">b_strategy/b_frame_strategy</samp> -> <samp class="option">BRefType</samp>
- </li><li><samp class="option">cgop/CLOSED_GOP</samp> codec flag -> <samp class="option">GopOptFlag</samp>
- </li><li>For the <var class="var">CQP</var> mode, the <samp class="option">i_qfactor/i_qoffset</samp> and
- <samp class="option">b_qfactor/b_qoffset</samp> set the difference between <var class="var">QPP</var> and <var class="var">QPI</var>,
- and <var class="var">QPP</var> and <var class="var">QPB</var> respectively.
- </li><li>Setting the <samp class="option">coder</samp> option to the value <var class="var">vlc</var> will make the H.264
- encoder use CAVLC instead of CABAC.
- </li></ul>
- <a name="Common-Options-1"></a>
- <h4 class="subsection">16.30.3 Common Options<span class="pull-right"><a class="anchor hidden-xs" href="#Common-Options-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Common-Options-1" aria-hidden="true">TOC</a></span></h4>
- <p>Following options are used by all qsv encoders.
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">async_depth</var></samp></dt>
- <dd><p>Specifies how many asynchronous operations an application performs
- before the application explicitly synchronizes the result. If zero,
- the value is not specified.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">preset</var></samp></dt>
- <dd><p>This option itemizes a range of choices from veryfast (best speed) to veryslow
- (best quality).
- </p><dl class="table">
- <dt>‘<samp class="samp">veryfast</samp>’</dt>
- <dt>‘<samp class="samp">faster</samp>’</dt>
- <dt>‘<samp class="samp">fast</samp>’</dt>
- <dt>‘<samp class="samp">medium</samp>’</dt>
- <dt>‘<samp class="samp">slow</samp>’</dt>
- <dt>‘<samp class="samp">slower</samp>’</dt>
- <dt>‘<samp class="samp">veryslow</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">forced_idr</var></samp></dt>
- <dd><p>Forcing I frames as IDR frames.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">low_power</var></samp></dt>
- <dd><p>For encoders set this flag to ON to reduce power consumption and GPU usage.
- </p></dd>
- </dl>
- <a name="Runtime-Options"></a>
- <h4 class="subsection">16.30.4 Runtime Options<span class="pull-right"><a class="anchor hidden-xs" href="#Runtime-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Runtime-Options" aria-hidden="true">TOC</a></span></h4>
- <p>Following options can be used during qsv encoding.
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">global_quality</var></samp></dt>
- <dt><samp class="option"><var class="var">i_quant_factor</var></samp></dt>
- <dt><samp class="option"><var class="var">i_quant_offset</var></samp></dt>
- <dt><samp class="option"><var class="var">b_quant_factor</var></samp></dt>
- <dt><samp class="option"><var class="var">b_quant_offset</var></samp></dt>
- <dd><p>Supported in h264_qsv and hevc_qsv.
- Change these value to reset qsv codec’s qp configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size</var></samp></dt>
- <dd><p>Supported in h264_qsv and hevc_qsv.
- Change this value to reset qsv codec’s MaxFrameSize configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">gop_size</var></samp></dt>
- <dd><p>Change this value to reset qsv codec’s gop configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_type</var></samp></dt>
- <dt><samp class="option"><var class="var">int_ref_cycle_size</var></samp></dt>
- <dt><samp class="option"><var class="var">int_ref_qp_delta</var></samp></dt>
- <dt><samp class="option"><var class="var">int_ref_cycle_dist</var></samp></dt>
- <dd><p>Supported in h264_qsv and hevc_qsv.
- Change these value to reset qsv codec’s Intra Refresh configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">qmax</var></samp></dt>
- <dt><samp class="option"><var class="var">qmin</var></samp></dt>
- <dt><samp class="option"><var class="var">max_qp_i</var></samp></dt>
- <dt><samp class="option"><var class="var">min_qp_i</var></samp></dt>
- <dt><samp class="option"><var class="var">max_qp_p</var></samp></dt>
- <dt><samp class="option"><var class="var">min_qp_p</var></samp></dt>
- <dt><samp class="option"><var class="var">max_qp_b</var></samp></dt>
- <dt><samp class="option"><var class="var">min_qp_b</var></samp></dt>
- <dd><p>Supported in h264_qsv.
- Change these value to reset qsv codec’s max/min qp configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">low_delay_brc</var></samp></dt>
- <dd><p>Supported in h264_qsv, hevc_qsv and av1_qsv.
- Change this value to reset qsv codec’s low_delay_brc configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">framerate</var></samp></dt>
- <dd><p>Change this value to reset qsv codec’s framerate configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">bit_rate</var></samp></dt>
- <dt><samp class="option"><var class="var">rc_buffer_size</var></samp></dt>
- <dt><samp class="option"><var class="var">rc_initial_buffer_occupancy</var></samp></dt>
- <dt><samp class="option"><var class="var">rc_max_rate</var></samp></dt>
- <dd><p>Change these value to reset qsv codec’s bitrate control configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">pic_timing_sei</var></samp></dt>
- <dd><p>Supported in h264_qsv and hevc_qsv.
- Change this value to reset qsv codec’s pic_timing_sei configuration.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">qsv_params</var></samp></dt>
- <dd><p>Set QSV encoder parameters as a colon-separated list of key-value pairs.
- </p>
- <p>The <samp class="option">qsv_params</samp> should be formatted as <code class="code">key1=value1:key2=value2:...</code>.
- </p>
- <p>These parameters are passed directly to the underlying Intel Quick Sync Video (QSV) encoder using the MFXSetParameter function.
- </p>
- <p>Example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp4 -c:v h264_qsv -qsv_params "CodingOption1=1:CodingOption2=2" output.mp4
- </pre></div>
- <p>This option allows fine-grained control over various encoder-specific settings provided by the QSV encoder.
- </p></dd>
- </dl>
- <a name="H264-options"></a>
- <h4 class="subsection">16.30.5 H264 options<span class="pull-right"><a class="anchor hidden-xs" href="#H264-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-H264-options" aria-hidden="true">TOC</a></span></h4>
- <p>These options are used by h264_qsv
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">extbrc</var></samp></dt>
- <dd><p>Extended bitrate control.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">recovery_point_sei</var></samp></dt>
- <dd><p>Set this flag to insert the recovery point SEI message at the beginning of every
- intra refresh cycle.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">rdo</var></samp></dt>
- <dd><p>Enable rate distortion optimization.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size</var></samp></dt>
- <dd><p>Maximum encoded frame size in bytes.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size_i</var></samp></dt>
- <dd><p>Maximum encoded frame size for I frames in bytes. If this value is set as larger
- than zero, then for I frames the value set by max_frame_size is ignored.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size_p</var></samp></dt>
- <dd><p>Maximum encoded frame size for P frames in bytes. If this value is set as larger
- than zero, then for P frames the value set by max_frame_size is ignored.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_slice_size</var></samp></dt>
- <dd><p>Maximum encoded slice size in bytes.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">bitrate_limit</var></samp></dt>
- <dd><p>Toggle bitrate limitations.
- Modifies bitrate to be in the range imposed by the QSV encoder. Setting this
- flag off may lead to violation of HRD conformance. Mind that specifying bitrate
- below the QSV encoder range might significantly affect quality. If on this
- option takes effect in non CQP modes: if bitrate is not in the range imposed
- by the QSV encoder, it will be changed to be in the range.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">mbbrc</var></samp></dt>
- <dd><p>Setting this flag enables macroblock level bitrate control that generally
- improves subjective visual quality. Enabling this flag may have negative impact
- on performance and objective visual quality metric.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">low_delay_brc</var></samp></dt>
- <dd><p>Setting this flag turns on or off LowDelayBRC feature in qsv plugin, which provides
- more accurate bitrate control to minimize the variance of bitstream size frame
- by frame. Value: -1-default 0-off 1-on
- </p>
- </dd>
- <dt><samp class="option"><var class="var">adaptive_i</var></samp></dt>
- <dd><p>This flag controls insertion of I frames by the QSV encoder. Turn ON this flag
- to allow changing of frame type from P and B to I.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">adaptive_b</var></samp></dt>
- <dd><p>This flag controls changing of frame type from B to P.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">p_strategy</var></samp></dt>
- <dd><p>Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0).
- </p>
- </dd>
- <dt><samp class="option"><var class="var">b_strategy</var></samp></dt>
- <dd><p>This option controls usage of B frames as reference.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">dblk_idc</var></samp></dt>
- <dd><p>This option disable deblocking. It has value in range 0~2.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">cavlc</var></samp></dt>
- <dd><p>If set, CAVLC is used; if unset, CABAC is used for encoding.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">vcm</var></samp></dt>
- <dd><p>Video conferencing mode, please see ratecontrol method.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">idr_interval</var></samp></dt>
- <dd><p>Distance (in I-frames) between IDR frames.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">pic_timing_sei</var></samp></dt>
- <dd><p>Insert picture timing SEI with pic_struct_syntax element.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">single_sei_nal_unit</var></samp></dt>
- <dd><p>Put all the SEI messages into one NALU.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_dec_frame_buffering</var></samp></dt>
- <dd><p>Maximum number of frames buffered in the DPB.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">look_ahead</var></samp></dt>
- <dd><p>Use VBR algorithm with look ahead.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">look_ahead_depth</var></samp></dt>
- <dd><p>Depth of look ahead in number frames.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">look_ahead_downsampling</var></samp></dt>
- <dd><p>Downscaling factor for the frames saved for the lookahead analysis.
- </p><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dt>‘<samp class="samp">off</samp>’</dt>
- <dt>‘<samp class="samp">2x</samp>’</dt>
- <dt>‘<samp class="samp">4x</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_type</var></samp></dt>
- <dd><p>Specifies intra refresh type. The major goal of intra refresh is improvement of
- error resilience without significant impact on encoded bitstream size caused by
- I frames. The SDK encoder achieves this by encoding part of each frame in
- refresh cycle using intra MBs. <var class="var">none</var> means no refresh. <var class="var">vertical</var> means
- vertical refresh, by column of MBs. <var class="var">horizontal</var> means horizontal refresh,
- by rows of MBs. <var class="var">slice</var> means horizontal refresh by slices without
- overlapping. In case of <var class="var">slice</var>, in_ref_cycle_size is ignored. To enable
- intra refresh, B frame should be set to 0.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_cycle_size</var></samp></dt>
- <dd><p>Specifies number of pictures within refresh cycle starting from 2. 0 and 1 are
- invalid values.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_qp_delta</var></samp></dt>
- <dd><p>Specifies QP difference for inserted intra MBs. This is signed value in
- [-51, 51] range if target encoding bit-depth for luma samples is 8 and this
- range is [-63, 63] for 10 bit-depth or [-75, 75] for 12 bit-depth respectively.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_cycle_dist</var></samp></dt>
- <dd><p>Distance between the beginnings of the intra-refresh cycles in frames.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">profile</var></samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">baseline</samp>’</dt>
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">high</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">a53cc</var></samp></dt>
- <dd><p>Use A53 Closed Captions (if available).
- </p>
- </dd>
- <dt><samp class="option"><var class="var">aud</var></samp></dt>
- <dd><p>Insert the Access Unit Delimiter NAL.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">mfmode</var></samp></dt>
- <dd><p>Multi-Frame Mode.
- </p><dl class="table">
- <dt>‘<samp class="samp">off</samp>’</dt>
- <dt>‘<samp class="samp">auto</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">repeat_pps</var></samp></dt>
- <dd><p>Repeat pps for every frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_qp_i</var></samp></dt>
- <dd><p>Maximum video quantizer scale for I frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">min_qp_i</var></samp></dt>
- <dd><p>Minimum video quantizer scale for I frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_qp_p</var></samp></dt>
- <dd><p>Maximum video quantizer scale for P frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">min_qp_p</var></samp></dt>
- <dd><p>Minimum video quantizer scale for P frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_qp_b</var></samp></dt>
- <dd><p>Maximum video quantizer scale for B frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">min_qp_b</var></samp></dt>
- <dd><p>Minimum video quantizer scale for B frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">scenario</var></samp></dt>
- <dd><p>Provides a hint to encoder about the scenario for the encoding session.
- </p><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">displayremoting</samp>’</dt>
- <dt>‘<samp class="samp">videoconference</samp>’</dt>
- <dt>‘<samp class="samp">archive</samp>’</dt>
- <dt>‘<samp class="samp">livestreaming</samp>’</dt>
- <dt>‘<samp class="samp">cameracapture</samp>’</dt>
- <dt>‘<samp class="samp">videosurveillance</samp>’</dt>
- <dt>‘<samp class="samp">gamestreaming</samp>’</dt>
- <dt>‘<samp class="samp">remotegaming</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">avbr_accuracy</var></samp></dt>
- <dd><p>Accuracy of the AVBR ratecontrol (unit of tenth of percent).
- </p>
- </dd>
- <dt><samp class="option"><var class="var">avbr_convergence</var></samp></dt>
- <dd><p>Convergence of the AVBR ratecontrol (unit of 100 frames)
- </p>
- <p>The parameters <var class="var">avbr_accuracy</var> and <var class="var">avbr_convergence</var> are for the
- average variable bitrate control (AVBR) algorithm.
- The algorithm focuses on overall encoding quality while meeting the specified
- bitrate, <var class="var">target_bitrate</var>, within the accuracy range <var class="var">avbr_accuracy</var>,
- after a <var class="var">avbr_Convergence</var> period. This method does not follow HRD and the
- instant bitrate is not capped or padded.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">skip_frame</var></samp></dt>
- <dd><p>Use per-frame metadata "qsv_skip_frame" to skip frame when encoding. This option
- defines the usage of this metadata.
- </p><dl class="table">
- <dt>‘<samp class="samp">no_skip</samp>’</dt>
- <dd><p>Frame skipping is disabled.
- </p></dd>
- <dt>‘<samp class="samp">insert_dummy</samp>’</dt>
- <dd><p>Encoder inserts into bitstream frame where all macroblocks are encoded as
- skipped.
- </p></dd>
- <dt>‘<samp class="samp">insert_nothing</samp>’</dt>
- <dd><p>Similar to insert_dummy, but encoder inserts nothing into bitstream. The skipped
- frames are still used in brc. For example, gop still include skipped frames, and
- the frames after skipped frames will be larger in size.
- </p></dd>
- <dt>‘<samp class="samp">brc_only</samp>’</dt>
- <dd><p>skip_frame metadata indicates the number of missed frames before the current
- frame.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="HEVC-Options-1"></a>
- <h4 class="subsection">16.30.6 HEVC Options<span class="pull-right"><a class="anchor hidden-xs" href="#HEVC-Options-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-HEVC-Options-1" aria-hidden="true">TOC</a></span></h4>
- <p>These options are used by hevc_qsv
- </p>
- <dl class="table">
- <dt><samp class="option"><var class="var">extbrc</var></samp></dt>
- <dd><p>Extended bitrate control.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">recovery_point_sei</var></samp></dt>
- <dd><p>Set this flag to insert the recovery point SEI message at the beginning of every
- intra refresh cycle.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">rdo</var></samp></dt>
- <dd><p>Enable rate distortion optimization.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size</var></samp></dt>
- <dd><p>Maximum encoded frame size in bytes.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size_i</var></samp></dt>
- <dd><p>Maximum encoded frame size for I frames in bytes. If this value is set as larger
- than zero, then for I frames the value set by max_frame_size is ignored.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size_p</var></samp></dt>
- <dd><p>Maximum encoded frame size for P frames in bytes. If this value is set as larger
- than zero, then for P frames the value set by max_frame_size is ignored.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_slice_size</var></samp></dt>
- <dd><p>Maximum encoded slice size in bytes.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">mbbrc</var></samp></dt>
- <dd><p>Setting this flag enables macroblock level bitrate control that generally
- improves subjective visual quality. Enabling this flag may have negative impact
- on performance and objective visual quality metric.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">low_delay_brc</var></samp></dt>
- <dd><p>Setting this flag turns on or off LowDelayBRC feature in qsv plugin, which provides
- more accurate bitrate control to minimize the variance of bitstream size frame
- by frame. Value: -1-default 0-off 1-on
- </p>
- </dd>
- <dt><samp class="option"><var class="var">adaptive_i</var></samp></dt>
- <dd><p>This flag controls insertion of I frames by the QSV encoder. Turn ON this flag
- to allow changing of frame type from P and B to I.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">adaptive_b</var></samp></dt>
- <dd><p>This flag controls changing of frame type from B to P.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">p_strategy</var></samp></dt>
- <dd><p>Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0).
- </p>
- </dd>
- <dt><samp class="option"><var class="var">b_strategy</var></samp></dt>
- <dd><p>This option controls usage of B frames as reference.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">dblk_idc</var></samp></dt>
- <dd><p>This option disable deblocking. It has value in range 0~2.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">idr_interval</var></samp></dt>
- <dd><p>Distance (in I-frames) between IDR frames.
- </p><dl class="table">
- <dt>‘<samp class="samp">begin_only</samp>’</dt>
- <dd><p>Output an IDR-frame only at the beginning of the stream.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">load_plugin</var></samp></dt>
- <dd><p>A user plugin to load in an internal session.
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dt>‘<samp class="samp">hevc_sw</samp>’</dt>
- <dt>‘<samp class="samp">hevc_hw</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">load_plugins</var></samp></dt>
- <dd><p>A :-separate list of hexadecimal plugin UIDs to load in
- an internal session.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">look_ahead_depth</var></samp></dt>
- <dd><p>Depth of look ahead in number frames, available when extbrc option is enabled.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">profile</var></samp></dt>
- <dd><p>Set the encoding profile (scc requires libmfx >= 1.32).
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">main10</samp>’</dt>
- <dt>‘<samp class="samp">mainsp</samp>’</dt>
- <dt>‘<samp class="samp">rext</samp>’</dt>
- <dt>‘<samp class="samp">scc</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">tier</var></samp></dt>
- <dd><p>Set the encoding tier (only level >= 4 can support high tier).
- This option only takes effect when the level option is specified.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">high</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">gpb</var></samp></dt>
- <dd><p>1: GPB (generalized P/B frame)
- </p>
- <p>0: regular P frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">tile_cols</var></samp></dt>
- <dd><p>Number of columns for tiled encoding.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">tile_rows</var></samp></dt>
- <dd><p>Number of rows for tiled encoding.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">aud</var></samp></dt>
- <dd><p>Insert the Access Unit Delimiter NAL.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">pic_timing_sei</var></samp></dt>
- <dd><p>Insert picture timing SEI with pic_struct_syntax element.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">transform_skip</var></samp></dt>
- <dd><p>Turn this option ON to enable transformskip. It is supported on platform equal
- or newer than ICL.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_type</var></samp></dt>
- <dd><p>Specifies intra refresh type. The major goal of intra refresh is improvement of
- error resilience without significant impact on encoded bitstream size caused by
- I frames. The SDK encoder achieves this by encoding part of each frame in
- refresh cycle using intra MBs. <var class="var">none</var> means no refresh. <var class="var">vertical</var> means
- vertical refresh, by column of MBs. <var class="var">horizontal</var> means horizontal refresh,
- by rows of MBs. <var class="var">slice</var> means horizontal refresh by slices without
- overlapping. In case of <var class="var">slice</var>, in_ref_cycle_size is ignored. To enable
- intra refresh, B frame should be set to 0.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_cycle_size</var></samp></dt>
- <dd><p>Specifies number of pictures within refresh cycle starting from 2. 0 and 1 are
- invalid values.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_qp_delta</var></samp></dt>
- <dd><p>Specifies QP difference for inserted intra MBs. This is signed value in
- [-51, 51] range if target encoding bit-depth for luma samples is 8 and this
- range is [-63, 63] for 10 bit-depth or [-75, 75] for 12 bit-depth respectively.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">int_ref_cycle_dist</var></samp></dt>
- <dd><p>Distance between the beginnings of the intra-refresh cycles in frames.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_qp_i</var></samp></dt>
- <dd><p>Maximum video quantizer scale for I frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">min_qp_i</var></samp></dt>
- <dd><p>Minimum video quantizer scale for I frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_qp_p</var></samp></dt>
- <dd><p>Maximum video quantizer scale for P frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">min_qp_p</var></samp></dt>
- <dd><p>Minimum video quantizer scale for P frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_qp_b</var></samp></dt>
- <dd><p>Maximum video quantizer scale for B frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">min_qp_b</var></samp></dt>
- <dd><p>Minimum video quantizer scale for B frame.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">scenario</var></samp></dt>
- <dd><p>Provides a hint to encoder about the scenario for the encoding session.
- </p><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">displayremoting</samp>’</dt>
- <dt>‘<samp class="samp">videoconference</samp>’</dt>
- <dt>‘<samp class="samp">archive</samp>’</dt>
- <dt>‘<samp class="samp">livestreaming</samp>’</dt>
- <dt>‘<samp class="samp">cameracapture</samp>’</dt>
- <dt>‘<samp class="samp">videosurveillance</samp>’</dt>
- <dt>‘<samp class="samp">gamestreaming</samp>’</dt>
- <dt>‘<samp class="samp">remotegaming</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">avbr_accuracy</var></samp></dt>
- <dd><p>Accuracy of the AVBR ratecontrol (unit of tenth of percent).
- </p>
- </dd>
- <dt><samp class="option"><var class="var">avbr_convergence</var></samp></dt>
- <dd><p>Convergence of the AVBR ratecontrol (unit of 100 frames)
- </p>
- <p>The parameters <var class="var">avbr_accuracy</var> and <var class="var">avbr_convergence</var> are for the
- average variable bitrate control (AVBR) algorithm.
- The algorithm focuses on overall encoding quality while meeting the specified
- bitrate, <var class="var">target_bitrate</var>, within the accuracy range <var class="var">avbr_accuracy</var>,
- after a <var class="var">avbr_Convergence</var> period. This method does not follow HRD and the
- instant bitrate is not capped or padded.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">skip_frame</var></samp></dt>
- <dd><p>Use per-frame metadata "qsv_skip_frame" to skip frame when encoding. This option
- defines the usage of this metadata.
- </p><dl class="table">
- <dt>‘<samp class="samp">no_skip</samp>’</dt>
- <dd><p>Frame skipping is disabled.
- </p></dd>
- <dt>‘<samp class="samp">insert_dummy</samp>’</dt>
- <dd><p>Encoder inserts into bitstream frame where all macroblocks are encoded as
- skipped.
- </p></dd>
- <dt>‘<samp class="samp">insert_nothing</samp>’</dt>
- <dd><p>Similar to insert_dummy, but encoder inserts nothing into bitstream. The skipped
- frames are still used in brc. For example, gop still include skipped frames, and
- the frames after skipped frames will be larger in size.
- </p></dd>
- <dt>‘<samp class="samp">brc_only</samp>’</dt>
- <dd><p>skip_frame metadata indicates the number of missed frames before the current
- frame.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="MPEG2-Options"></a>
- <h4 class="subsection">16.30.7 MPEG2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#MPEG2-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-MPEG2-Options" aria-hidden="true">TOC</a></span></h4>
- <p>These options are used by mpeg2_qsv
- </p><dl class="table">
- <dt><samp class="option"><var class="var">profile</var></samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dt>‘<samp class="samp">high</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="VP9-Options"></a>
- <h4 class="subsection">16.30.8 VP9 Options<span class="pull-right"><a class="anchor hidden-xs" href="#VP9-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-VP9-Options" aria-hidden="true">TOC</a></span></h4>
- <p>These options are used by vp9_qsv
- </p><dl class="table">
- <dt><samp class="option"><var class="var">profile</var></samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">profile0</samp>’</dt>
- <dt>‘<samp class="samp">profile1</samp>’</dt>
- <dt>‘<samp class="samp">profile2</samp>’</dt>
- <dt>‘<samp class="samp">profile3</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">tile_cols</var></samp></dt>
- <dd><p>Number of columns for tiled encoding (requires libmfx >= 1.29).
- </p>
- </dd>
- <dt><samp class="option"><var class="var">tile_rows</var></samp></dt>
- <dd><p>Number of rows for tiled encoding (requires libmfx >= 1.29).
- </p></dd>
- </dl>
- <a name="AV1-Options"></a>
- <h4 class="subsection">16.30.9 AV1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#AV1-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AV1-Options" aria-hidden="true">TOC</a></span></h4>
- <p>These options are used by av1_qsv (requires libvpl).
- </p><dl class="table">
- <dt><samp class="option"><var class="var">profile</var></samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">main</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option"><var class="var">tile_cols</var></samp></dt>
- <dd><p>Number of columns for tiled encoding.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">tile_rows</var></samp></dt>
- <dd><p>Number of rows for tiled encoding.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">adaptive_i</var></samp></dt>
- <dd><p>This flag controls insertion of I frames by the QSV encoder. Turn ON this flag
- to allow changing of frame type from P and B to I.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">adaptive_b</var></samp></dt>
- <dd><p>This flag controls changing of frame type from B to P.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">b_strategy</var></samp></dt>
- <dd><p>This option controls usage of B frames as reference.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">extbrc</var></samp></dt>
- <dd><p>Extended bitrate control.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">look_ahead_depth</var></samp></dt>
- <dd><p>Depth of look ahead in number frames, available when extbrc option is enabled.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">low_delay_brc</var></samp></dt>
- <dd><p>Setting this flag turns on or off LowDelayBRC feature in qsv plugin, which provides
- more accurate bitrate control to minimize the variance of bitstream size frame
- by frame. Value: -1-default 0-off 1-on
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size</var></samp></dt>
- <dd><p>Set the allowed max size in bytes for each frame. If the frame size exceeds
- the limitation, encoder will adjust the QP value to control the frame size.
- Invalid in CQP rate control mode.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size_i</var></samp></dt>
- <dd><p>Maximum encoded frame size for I frames in bytes. If this value is set as larger
- than zero, then for I frames the value set by max_frame_size is ignored.
- </p>
- </dd>
- <dt><samp class="option"><var class="var">max_frame_size_p</var></samp></dt>
- <dd><p>Maximum encoded frame size for P frames in bytes. If this value is set as larger
- than zero, then for P frames the value set by max_frame_size is ignored.
- </p></dd>
- </dl>
- <a name="snow"></a>
- <h3 class="section">16.31 snow<span class="pull-right"><a class="anchor hidden-xs" href="#snow" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-snow" aria-hidden="true">TOC</a></span></h3>
- <a name="Options-51"></a>
- <h4 class="subsection">16.31.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-51" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-51" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">iterative_dia_size</samp></dt>
- <dd><p>dia size for the iterative motion estimation
- </p></dd>
- </dl>
- <a name="VAAPI-encoders"></a>
- <h3 class="section">16.32 VAAPI encoders<span class="pull-right"><a class="anchor hidden-xs" href="#VAAPI-encoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-VAAPI-encoders" aria-hidden="true">TOC</a></span></h3>
- <p>Wrappers for hardware encoders accessible via VAAPI.
- </p>
- <p>These encoders only accept input in VAAPI hardware surfaces. If you have input
- in software frames, use the <samp class="option">hwupload</samp> filter to upload them to the GPU.
- </p>
- <p>The following standard libavcodec options are used:
- </p><ul class="itemize mark-bullet">
- <li><samp class="option">g</samp> / <samp class="option">gop_size</samp>
- </li><li><samp class="option">bf</samp> / <samp class="option">max_b_frames</samp>
- </li><li><samp class="option">profile</samp>
- <p>If not set, this will be determined automatically from the format of the input
- frames and the profiles supported by the driver.
- </p></li><li><samp class="option">level</samp>
- </li><li><samp class="option">b</samp> / <samp class="option">bit_rate</samp>
- </li><li><samp class="option">maxrate</samp> / <samp class="option">rc_max_rate</samp>
- </li><li><samp class="option">bufsize</samp> / <samp class="option">rc_buffer_size</samp>
- </li><li><samp class="option">rc_init_occupancy</samp> / <samp class="option">rc_initial_buffer_occupancy</samp>
- </li><li><samp class="option">compression_level</samp>
- <p>Speed / quality tradeoff: higher values are faster / worse quality.
- </p></li><li><samp class="option">q</samp> / <samp class="option">global_quality</samp>
- <p>Size / quality tradeoff: higher values are smaller / worse quality.
- </p></li><li><samp class="option">qmin</samp>
- </li><li><samp class="option">qmax</samp>
- </li><li><samp class="option">i_qfactor</samp> / <samp class="option">i_quant_factor</samp>
- </li><li><samp class="option">i_qoffset</samp> / <samp class="option">i_quant_offset</samp>
- </li><li><samp class="option">b_qfactor</samp> / <samp class="option">b_quant_factor</samp>
- </li><li><samp class="option">b_qoffset</samp> / <samp class="option">b_quant_offset</samp>
- </li><li><samp class="option">slices</samp>
- </li></ul>
- <p>All encoders support the following options:
- </p><dl class="table">
- <dt><samp class="option">low_power</samp></dt>
- <dd><p>Some drivers/platforms offer a second encoder for some codecs intended to use
- less power than the default encoder; setting this option will attempt to use
- that encoder. Note that it may support a reduced feature set, so some other
- options may not be available in this mode.
- </p>
- </dd>
- <dt><samp class="option">idr_interval</samp></dt>
- <dd><p>Set the number of normal intra frames between full-refresh (IDR) frames in
- open-GOP mode. The intra frames are still IRAPs, but will not include global
- headers and may have non-decodable leading pictures.
- </p>
- </dd>
- <dt><samp class="option">b_depth</samp></dt>
- <dd><p>Set the B-frame reference depth. When set to one (the default), all B-frames
- will refer only to P- or I-frames. When set to greater values multiple layers
- of B-frames will be present, frames in each layer only referring to frames in
- higher layers.
- </p>
- </dd>
- <dt><samp class="option">async_depth</samp></dt>
- <dd><p>Maximum processing parallelism. Increase this to improve single channel
- performance. This option doesn’t work if driver doesn’t implement vaSyncBuffer
- function. Please make sure there are enough hw_frames allocated if a large
- number of async_depth is used.
- </p>
- </dd>
- <dt><samp class="option">max_frame_size</samp></dt>
- <dd><p>Set the allowed max size in bytes for each frame. If the frame size exceeds
- the limitation, encoder will adjust the QP value to control the frame size.
- Invalid in CQP rate control mode.
- </p>
- </dd>
- <dt><samp class="option">rc_mode</samp></dt>
- <dd><p>Set the rate control mode to use. A given driver may only support a subset of
- modes.
- </p>
- <p>Possible modes:
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Choose the mode automatically based on driver support and the other options.
- This is the default.
- </p></dd>
- <dt><samp class="option">CQP</samp></dt>
- <dd><p>Constant-quality.
- </p></dd>
- <dt><samp class="option">CBR</samp></dt>
- <dd><p>Constant-bitrate.
- </p></dd>
- <dt><samp class="option">VBR</samp></dt>
- <dd><p>Variable-bitrate.
- </p></dd>
- <dt><samp class="option">ICQ</samp></dt>
- <dd><p>Intelligent constant-quality.
- </p></dd>
- <dt><samp class="option">QVBR</samp></dt>
- <dd><p>Quality-defined variable-bitrate.
- </p></dd>
- <dt><samp class="option">AVBR</samp></dt>
- <dd><p>Average variable bitrate.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">blbrc</samp></dt>
- <dd><p>Enable block level rate control, which assigns different bitrate block by block.
- Invalid for CQP mode.
- </p>
- </dd>
- </dl>
- <p>Each encoder also has its own specific options:
- </p><dl class="table">
- <dt><samp class="option">av1_vaapi</samp></dt>
- <dd><p><samp class="option">profile</samp> sets the value of <em class="emph">seq_profile</em>.
- <samp class="option">tier</samp> sets the value of <em class="emph">seq_tier</em>.
- <samp class="option">level</samp> sets the value of <em class="emph">seq_level_idx</em>.
- </p>
- <dl class="table">
- <dt><samp class="option">tiles</samp></dt>
- <dd><p>Set the number of tiles to encode the input video with, as columns x rows.
- (default is auto, which means use minimal tile column/row number).
- </p></dd>
- <dt><samp class="option">tile_groups</samp></dt>
- <dd><p>Set tile groups number. All the tiles will be distributed as evenly as possible to
- each tile group. (default is 1).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">h264_vaapi</samp></dt>
- <dd><p><samp class="option">profile</samp> sets the value of <em class="emph">profile_idc</em> and the <em class="emph">constraint_set*_flag</em>s.
- <samp class="option">level</samp> sets the value of <em class="emph">level_idc</em>.
- </p>
- <dl class="table">
- <dt><samp class="option">coder</samp></dt>
- <dd><p>Set entropy encoder (default is <em class="emph">cabac</em>). Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">ac</samp>’</dt>
- <dt>‘<samp class="samp">cabac</samp>’</dt>
- <dd><p>Use CABAC.
- </p>
- </dd>
- <dt>‘<samp class="samp">vlc</samp>’</dt>
- <dt>‘<samp class="samp">cavlc</samp>’</dt>
- <dd><p>Use CAVLC.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">aud</samp></dt>
- <dd><p>Include access unit delimiters in the stream (not included by default).
- </p>
- </dd>
- <dt><samp class="option">sei</samp></dt>
- <dd><p>Set SEI message types to include.
- Some combination of the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">identifier</samp>’</dt>
- <dd><p>Include a <em class="emph">user_data_unregistered</em> message containing information about
- the encoder.
- </p></dd>
- <dt>‘<samp class="samp">timing</samp>’</dt>
- <dd><p>Include picture timing parameters (<em class="emph">buffering_period</em> and
- <em class="emph">pic_timing</em> messages).
- </p></dd>
- <dt>‘<samp class="samp">recovery_point</samp>’</dt>
- <dd><p>Include recovery points where appropriate (<em class="emph">recovery_point</em> messages).
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">hevc_vaapi</samp></dt>
- <dd><p><samp class="option">profile</samp> and <samp class="option">level</samp> set the values of
- <em class="emph">general_profile_idc</em> and <em class="emph">general_level_idc</em> respectively.
- </p>
- <dl class="table">
- <dt><samp class="option">aud</samp></dt>
- <dd><p>Include access unit delimiters in the stream (not included by default).
- </p>
- </dd>
- <dt><samp class="option">tier</samp></dt>
- <dd><p>Set <em class="emph">general_tier_flag</em>. This may affect the level chosen for the stream
- if it is not explicitly specified.
- </p>
- </dd>
- <dt><samp class="option">sei</samp></dt>
- <dd><p>Set SEI message types to include.
- Some combination of the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">hdr</samp>’</dt>
- <dd><p>Include HDR metadata if the input frames have it
- (<em class="emph">mastering_display_colour_volume</em> and <em class="emph">content_light_level</em>
- messages).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tiles</samp></dt>
- <dd><p>Set the number of tiles to encode the input video with, as columns x rows.
- Larger numbers allow greater parallelism in both encoding and decoding, but
- may decrease coding efficiency.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">mjpeg_vaapi</samp></dt>
- <dd><p>Only baseline DCT encoding is supported. The encoder always uses the standard
- quantisation and huffman tables - <samp class="option">global_quality</samp> scales the standard
- quantisation table (range 1-100).
- </p>
- <p>For YUV, 4:2:0, 4:2:2 and 4:4:4 subsampling modes are supported. RGB is also
- supported, and will create an RGB JPEG.
- </p>
- <dl class="table">
- <dt><samp class="option">jfif</samp></dt>
- <dd><p>Include JFIF header in each frame (not included by default).
- </p></dd>
- <dt><samp class="option">huffman</samp></dt>
- <dd><p>Include standard huffman tables (on by default). Turning this off will save
- a few hundred bytes in each output frame, but may lose compatibility with some
- JPEG decoders which don’t fully handle MJPEG.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">mpeg2_vaapi</samp></dt>
- <dd><p><samp class="option">profile</samp> and <samp class="option">level</samp> set the value of <em class="emph">profile_and_level_indication</em>.
- </p>
- </dd>
- <dt><samp class="option">vp8_vaapi</samp></dt>
- <dd><p>B-frames are not supported.
- </p>
- <p><samp class="option">global_quality</samp> sets the <em class="emph">q_idx</em> used for non-key frames (range 0-127).
- </p>
- <dl class="table">
- <dt><samp class="option">loop_filter_level</samp></dt>
- <dt><samp class="option">loop_filter_sharpness</samp></dt>
- <dd><p>Manually set the loop filter parameters.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">vp9_vaapi</samp></dt>
- <dd><p><samp class="option">global_quality</samp> sets the <em class="emph">q_idx</em> used for P-frames (range 0-255).
- </p>
- <dl class="table">
- <dt><samp class="option">loop_filter_level</samp></dt>
- <dt><samp class="option">loop_filter_sharpness</samp></dt>
- <dd><p>Manually set the loop filter parameters.
- </p></dd>
- </dl>
- <p>B-frames are supported, but the output stream is always in encode order rather than display
- order. If B-frames are enabled, it may be necessary to use the <samp class="option">vp9_raw_reorder</samp>
- bitstream filter to modify the output stream to display frames in the correct order.
- </p>
- <p>Only normal frames are produced - the <samp class="option">vp9_superframe</samp> bitstream filter may be
- required to produce a stream usable with all decoders.
- </p>
- </dd>
- </dl>
- <a name="vbn"></a>
- <h3 class="section">16.33 vbn<span class="pull-right"><a class="anchor hidden-xs" href="#vbn" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vbn" aria-hidden="true">TOC</a></span></h3>
- <p>Vizrt Binary Image encoder.
- </p>
- <p>This format is used by the broadcast vendor Vizrt for quick texture streaming.
- Advanced features of the format such as LZW compression of texture data or
- generation of mipmaps are not supported.
- </p>
- <a name="Options-52"></a>
- <h4 class="subsection">16.33.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-52" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-52" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">format <var class="var">string</var></samp></dt>
- <dd><p>Sets the texture compression used by the VBN file. Can be <var class="var">dxt1</var>,
- <var class="var">dxt5</var> or <var class="var">raw</var>. Default is <var class="var">dxt5</var>.
- </p></dd>
- </dl>
- <a name="vc2"></a>
- <h3 class="section">16.34 vc2<span class="pull-right"><a class="anchor hidden-xs" href="#vc2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vc2" aria-hidden="true">TOC</a></span></h3>
- <p>SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed at
- professional broadcasting but since it supports yuv420, yuv422 and yuv444 at
- 8 (limited range or full range), 10 or 12 bits, this makes it suitable for
- other tasks which require low overhead and low compression (like screen
- recording).
- </p>
- <a name="Options-53"></a>
- <h4 class="subsection">16.34.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-53" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-53" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dd><p>Sets target video bitrate. Usually that’s around 1:6 of the uncompressed
- video bitrate (e.g. for 1920x1080 50fps yuv422p10 that’s around 400Mbps). Higher
- values (close to the uncompressed bitrate) turn on lossless compression mode.
- </p>
- </dd>
- <dt><samp class="option">field_order</samp></dt>
- <dd><p>Enables field coding when set (e.g. to tt - top field first) for interlaced
- inputs. Should increase compression with interlaced content as it splits the
- fields and encodes each separately.
- </p>
- </dd>
- <dt><samp class="option">wavelet_depth</samp></dt>
- <dd><p>Sets the total amount of wavelet transforms to apply, between 1 and 5 (default).
- Lower values reduce compression and quality. Less capable decoders may not be
- able to handle values of <samp class="option">wavelet_depth</samp> over 3.
- </p>
- </dd>
- <dt><samp class="option">wavelet_type</samp></dt>
- <dd><p>Sets the transform type. Currently only <var class="var">5_3</var> (LeGall) and <var class="var">9_7</var>
- (Deslauriers-Dubuc)
- are implemented, with 9_7 being the one with better compression and thus
- is the default.
- </p>
- </dd>
- <dt><samp class="option">slice_width</samp></dt>
- <dt><samp class="option">slice_height</samp></dt>
- <dd><p>Sets the slice size for each slice. Larger values result in better compression.
- For compatibility with other more limited decoders use <samp class="option">slice_width</samp> of
- 32 and <samp class="option">slice_height</samp> of 8.
- </p>
- </dd>
- <dt><samp class="option">tolerance</samp></dt>
- <dd><p>Sets the undershoot tolerance of the rate control system in percent. This is
- to prevent an expensive search from being run.
- </p>
- </dd>
- <dt><samp class="option">qm</samp></dt>
- <dd><p>Sets the quantization matrix preset to use by default or when <samp class="option">wavelet_depth</samp>
- is set to 5
- </p><ul class="itemize mark-minus">
- <li><var class="var">default</var>
- Uses the default quantization matrix from the specifications, extended with
- values for the fifth level. This provides a good balance between keeping detail
- and omitting artifacts.
- </li><li><var class="var">flat</var>
- Use a completely zeroed out quantization matrix. This increases PSNR but might
- reduce perception. Use in bogus benchmarks.
- </li><li><var class="var">color</var>
- Reduces detail but attempts to preserve color at extremely low bitrates.
- </li></ul>
- </dd>
- </dl>
- <a name="Subtitles-Encoders"></a>
- <h2 class="chapter">17 Subtitles Encoders<span class="pull-right"><a class="anchor hidden-xs" href="#Subtitles-Encoders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Subtitles-Encoders" aria-hidden="true">TOC</a></span></h2>
- <a name="dvbsub-1"></a>
- <h3 class="section">17.1 dvbsub<span class="pull-right"><a class="anchor hidden-xs" href="#dvbsub-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dvbsub-1" aria-hidden="true">TOC</a></span></h3>
- <p>This codec encodes the bitmap subtitle format that is used in DVB
- broadcasts and recordings. The bitmaps are typically embedded in a
- container such as MPEG-TS as a separate stream.
- </p>
- <a name="Options-54"></a>
- <h4 class="subsection">17.1.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-54" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-54" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">min_bpp <var class="var">integer (2, 4, or 8)</var></samp></dt>
- <dd><p>Set a minimum bits-per-pixel value for the subtitle color lookup tables.
- </p>
- <p>DVB supports 2, 4, and 8 bits-per-pixel color lookup tables. This
- option enables forcing a particular bits-per-pixel value regardless of
- the number of colors. Since not all players support or properly
- support 2 bits-per-pixel, this value defaults to 4.
- </p>
- </dd>
- </dl>
- <a name="dvdsub-1"></a>
- <h3 class="section">17.2 dvdsub<span class="pull-right"><a class="anchor hidden-xs" href="#dvdsub-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dvdsub-1" aria-hidden="true">TOC</a></span></h3>
- <p>This codec encodes the bitmap subtitle format that is used in DVDs.
- Typically they are stored in VOBSUB file pairs (*.idx + *.sub),
- and they can also be used in Matroska files.
- </p>
- <a name="Options-55"></a>
- <h4 class="subsection">17.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-55" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-55" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">palette</samp></dt>
- <dd><p>Specify the global palette used by the bitmaps.
- </p>
- <p>The format for this option is a string containing 16 24-bits hexadecimal
- numbers (without 0x prefix) separated by commas, for example <code class="code">0d00ee,
- ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
- 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b</code>.
- </p>
- </dd>
- <dt><samp class="option">even_rows_fix</samp></dt>
- <dd><p>When set to 1, enable a work-around that makes the number of pixel rows
- even in all subtitles. This fixes a problem with some players that
- cut off the bottom row if the number is odd. The work-around just adds
- a fully transparent row if needed. The overhead is low, typically
- one byte per subtitle on average.
- </p>
- <p>By default, this work-around is disabled.
- </p></dd>
- </dl>
- <a name="lrc"></a>
- <h3 class="section">17.3 lrc<span class="pull-right"><a class="anchor hidden-xs" href="#lrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lrc" aria-hidden="true">TOC</a></span></h3>
- <p>This codec encodes the LRC lyrics format.
- </p>
- <a name="Options-56"></a>
- <h4 class="subsection">17.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-56" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-56" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Specify the precision of the fractional part of the timestamp. Time base is
- determined based on this value.
- </p>
- <p>Defaults to 2 for centiseconds.
- </p></dd>
- </dl>
- <a name="Bitstream-Filters"></a>
- <h2 class="chapter">18 Bitstream Filters<span class="pull-right"><a class="anchor hidden-xs" href="#Bitstream-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Bitstream-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>When you configure your FFmpeg build, all the supported bitstream
- filters are enabled by default. You can list all available ones using
- the configure option <code class="code">--list-bsfs</code>.
- </p>
- <p>You can disable all the bitstream filters using the configure option
- <code class="code">--disable-bsfs</code>, and selectively enable any bitstream filter using
- the option <code class="code">--enable-bsf=BSF</code>, or you can disable a particular
- bitstream filter using the option <code class="code">--disable-bsf=BSF</code>.
- </p>
- <p>The option <code class="code">-bsfs</code> of the ff* tools will display the list of
- all the supported bitstream filters included in your build.
- </p>
- <p>The ff* tools have a -bsf option applied per stream, taking a
- comma-separated list of filters, whose parameters follow the filter
- name after a ’=’.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT
- </pre></div>
- <p>Below is a description of the currently available bitstream filters,
- with their parameters, if any.
- </p>
- <a name="aac_005fadtstoasc"></a>
- <h3 class="section">18.1 aac_adtstoasc<span class="pull-right"><a class="anchor hidden-xs" href="#aac_005fadtstoasc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aac_005fadtstoasc" aria-hidden="true">TOC</a></span></h3>
- <p>Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration
- bitstream.
- </p>
- <p>This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
- ADTS header and removes the ADTS header.
- </p>
- <p>This filter is required for example when copying an AAC stream from a
- raw ADTS AAC or an MPEG-TS container to MP4A-LATM, to an FLV file, or
- to MOV/MP4 files and related formats such as 3GP or M4A. Please note
- that it is auto-inserted for MP4A-LATM and MOV/MP4 and related formats.
- </p>
- <a name="av1_005fmetadata"></a>
- <h3 class="section">18.2 av1_metadata<span class="pull-right"><a class="anchor hidden-xs" href="#av1_005fmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-av1_005fmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>Modify metadata embedded in an AV1 stream.
- </p>
- <dl class="table">
- <dt><samp class="option">td</samp></dt>
- <dd><p>Insert or remove temporal delimiter OBUs in all temporal units of the
- stream.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">insert</samp>’</dt>
- <dd><p>Insert a TD at the beginning of every TU which does not already have one.
- </p></dd>
- <dt>‘<samp class="samp">remove</samp>’</dt>
- <dd><p>Remove the TD from the beginning of every TU which has one.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">color_primaries</samp></dt>
- <dt><samp class="option">transfer_characteristics</samp></dt>
- <dt><samp class="option">matrix_coefficients</samp></dt>
- <dd><p>Set the color description fields in the stream (see AV1 section 6.4.2).
- </p>
- </dd>
- <dt><samp class="option">color_range</samp></dt>
- <dd><p>Set the color range in the stream (see AV1 section 6.4.2; note that
- this cannot be set for streams using BT.709 primaries, sRGB transfer
- characteristic and identity (RGB) matrix coefficients).
- </p><dl class="table">
- <dt>‘<samp class="samp">tv</samp>’</dt>
- <dd><p>Limited range.
- </p></dd>
- <dt>‘<samp class="samp">pc</samp>’</dt>
- <dd><p>Full range.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">chroma_sample_position</samp></dt>
- <dd><p>Set the chroma sample location in the stream (see AV1 section 6.4.2).
- This can only be set for 4:2:0 streams.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">vertical</samp>’</dt>
- <dd><p>Left position (matching the default in MPEG-2 and H.264).
- </p></dd>
- <dt>‘<samp class="samp">colocated</samp>’</dt>
- <dd><p>Top-left position.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tick_rate</samp></dt>
- <dd><p>Set the tick rate (<em class="emph">time_scale / num_units_in_display_tick</em>) in
- the timing info in the sequence header.
- </p></dd>
- <dt><samp class="option">num_ticks_per_picture</samp></dt>
- <dd><p>Set the number of ticks in each picture, to indicate that the stream
- has a fixed framerate. Ignored if <samp class="option">tick_rate</samp> is not also set.
- </p>
- </dd>
- <dt><samp class="option">delete_padding</samp></dt>
- <dd><p>Deletes Padding OBUs.
- </p>
- </dd>
- </dl>
- <a name="chomp"></a>
- <h3 class="section">18.3 chomp<span class="pull-right"><a class="anchor hidden-xs" href="#chomp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chomp" aria-hidden="true">TOC</a></span></h3>
- <p>Remove zero padding at the end of a packet.
- </p>
- <a name="dca_005fcore"></a>
- <h3 class="section">18.4 dca_core<span class="pull-right"><a class="anchor hidden-xs" href="#dca_005fcore" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dca_005fcore" aria-hidden="true">TOC</a></span></h3>
- <p>Extract the core from a DCA/DTS stream, dropping extensions such as
- DTS-HD.
- </p>
- <a name="dovi_005frpu"></a>
- <h3 class="section">18.5 dovi_rpu<span class="pull-right"><a class="anchor hidden-xs" href="#dovi_005frpu" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dovi_005frpu" aria-hidden="true">TOC</a></span></h3>
- <p>Manipulate Dolby Vision metadata in a HEVC/AV1 bitstream, optionally enabling
- metadata compression.
- </p>
- <dl class="table">
- <dt><samp class="option">strip</samp></dt>
- <dd><p>If enabled, strip all Dolby Vision metadata (configuration record + RPU data
- blocks) from the stream.
- </p></dd>
- <dt><samp class="option">compression</samp></dt>
- <dd><p>Which compression level to enable.
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No metadata compression.
- </p></dd>
- <dt>‘<samp class="samp">limited</samp>’</dt>
- <dd><p>Limited metadata compression scheme. Should be compatible with most devices.
- This is the default.
- </p></dd>
- <dt>‘<samp class="samp">extended</samp>’</dt>
- <dd><p>Extended metadata compression. Devices are not required to support this. Note
- that this level currently behaves the same as ‘<samp class="samp">limited</samp>’ in libavcodec.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="dump_005fextra"></a>
- <h3 class="section">18.6 dump_extra<span class="pull-right"><a class="anchor hidden-xs" href="#dump_005fextra" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dump_005fextra" aria-hidden="true">TOC</a></span></h3>
- <p>Add extradata to the beginning of the filtered packets except when
- said packets already exactly begin with the extradata that is intended
- to be added.
- </p>
- <dl class="table">
- <dt><samp class="option">freq</samp></dt>
- <dd><p>The additional argument specifies which packets should be filtered.
- It accepts the values:
- </p><dl class="table">
- <dt>‘<samp class="samp">k</samp>’</dt>
- <dt>‘<samp class="samp">keyframe</samp>’</dt>
- <dd><p>add extradata to all key packets
- </p>
- </dd>
- <dt>‘<samp class="samp">e</samp>’</dt>
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>add extradata to all packets
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>If not specified it is assumed ‘<samp class="samp">k</samp>’.
- </p>
- <p>For example the following <code class="command">ffmpeg</code> command forces a global
- header (thus disabling individual packet headers) in the H.264 packets
- generated by the <code class="code">libx264</code> encoder, but corrects them by adding
- the header stored in extradata to the key packets:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra out.ts
- </pre></div>
- <a name="dv_005ferror_005fmarker"></a>
- <h3 class="section">18.7 dv_error_marker<span class="pull-right"><a class="anchor hidden-xs" href="#dv_005ferror_005fmarker" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dv_005ferror_005fmarker" aria-hidden="true">TOC</a></span></h3>
- <p>Blocks in DV which are marked as damaged are replaced by blocks of the specified color.
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>The color to replace damaged blocks by
- </p></dd>
- <dt><samp class="option">sta</samp></dt>
- <dd><p>A 16 bit mask which specifies which of the 16 possible error status values are
- to be replaced by colored blocks. 0xFFFE is the default which replaces all non 0
- error status values.
- </p><dl class="table">
- <dt>‘<samp class="samp">ok</samp>’</dt>
- <dd><p>No error, no concealment
- </p></dd>
- <dt>‘<samp class="samp">err</samp>’</dt>
- <dd><p>Error, No concealment
- </p></dd>
- <dt>‘<samp class="samp">res</samp>’</dt>
- <dd><p>Reserved
- </p></dd>
- <dt>‘<samp class="samp">notok</samp>’</dt>
- <dd><p>Error or concealment
- </p></dd>
- <dt>‘<samp class="samp">notres</samp>’</dt>
- <dd><p>Not reserved
- </p></dd>
- <dt>‘<samp class="samp">Aa, Ba, Ca, Ab, Bb, Cb, A, B, C, a, b, erri, erru</samp>’</dt>
- <dd><p>The specific error status code
- </p></dd>
- </dl>
- <p>see page 44-46 or section 5.5 of
- <a class="url" href="http://web.archive.org/web/20060927044735/http://www.smpte.org/smpte_store/standards/pdf/s314m.pdf">http://web.archive.org/web/20060927044735/http://www.smpte.org/smpte_store/standards/pdf/s314m.pdf</a>
- </p>
- </dd>
- </dl>
- <a name="eac3_005fcore"></a>
- <h3 class="section">18.8 eac3_core<span class="pull-right"><a class="anchor hidden-xs" href="#eac3_005fcore" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-eac3_005fcore" aria-hidden="true">TOC</a></span></h3>
- <p>Extract the core from a E-AC-3 stream, dropping extra channels.
- </p>
- <a name="eia608_005fto_005fsmpte436m"></a>
- <h3 class="section">18.9 eia608_to_smpte436m<span class="pull-right"><a class="anchor hidden-xs" href="#eia608_005fto_005fsmpte436m" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-eia608_005fto_005fsmpte436m" aria-hidden="true">TOC</a></span></h3>
- <p>Convert from a <code class="code">EIA_608</code> stream to a <code class="code">SMPTE_436M_ANC</code> data stream, wrapping the closed captions in CTA-708 CDP VANC packets.
- </p>
- <dl class="table">
- <dt><samp class="option">line_number</samp></dt>
- <dd><p>Choose which line number the generated VANC packets should go on. You generally want either line 9 (the default) or 11.
- </p></dd>
- <dt><samp class="option">wrapping_type</samp></dt>
- <dd><p>Choose the SMPTE 436M wrapping type, defaults to ‘<samp class="samp">vanc_frame</samp>’.
- It accepts the values:
- </p><dl class="table">
- <dt>‘<samp class="samp">vanc_frame</samp>’</dt>
- <dd><p>VANC frame (interlaced or segmented progressive frame)
- </p></dd>
- <dt>‘<samp class="samp">vanc_field_1</samp>’</dt>
- <dt>‘<samp class="samp">vanc_field_2</samp>’</dt>
- <dt>‘<samp class="samp">vanc_progressive_frame</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">sample_coding</samp></dt>
- <dd><p>Choose the SMPTE 436M sample coding, defaults to ‘<samp class="samp">8bit_luma</samp>’.
- It accepts the values:
- </p><dl class="table">
- <dt>‘<samp class="samp">8bit_luma</samp>’</dt>
- <dd><p>8-bit component luma samples
- </p></dd>
- <dt>‘<samp class="samp">8bit_color_diff</samp>’</dt>
- <dd><p>8-bit component color difference samples
- </p></dd>
- <dt>‘<samp class="samp">8bit_luma_and_color_diff</samp>’</dt>
- <dd><p>8-bit component luma and color difference samples
- </p></dd>
- <dt>‘<samp class="samp">10bit_luma</samp>’</dt>
- <dd><p>10-bit component luma samples
- </p></dd>
- <dt>‘<samp class="samp">10bit_color_diff</samp>’</dt>
- <dd><p>10-bit component color difference samples
- </p></dd>
- <dt>‘<samp class="samp">10bit_luma_and_color_diff</samp>’</dt>
- <dd><p>10-bit component luma and color difference samples
- </p></dd>
- <dt>‘<samp class="samp">8bit_luma_parity_error</samp>’</dt>
- <dd><p>8-bit component luma samples with parity error
- </p></dd>
- <dt>‘<samp class="samp">8bit_color_diff_parity_error</samp>’</dt>
- <dd><p>8-bit component color difference samples with parity error
- </p></dd>
- <dt>‘<samp class="samp">8bit_luma_and_color_diff_parity_error</samp>’</dt>
- <dd><p>8-bit component luma and color difference samples with parity error
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">initial_cdp_sequence_cntr</samp></dt>
- <dd><p>The initial value of the CDP’s 16-bit unsigned integer <code class="code">cdp_hdr_sequence_cntr</code> and <code class="code">cdp_ftr_sequence_cntr</code> fields. Defaults to 0.
- </p></dd>
- <dt><samp class="option">cdp_frame_rate</samp></dt>
- <dd><p>Set the CDP’s <code class="code">cdp_frame_rate</code> field. This doesn’t actually change the timing of the data stream, it just changes the values inserted in that field in the generated CDP packets. Defaults to ‘<samp class="samp">30000/1001</samp>’.
- </p></dd>
- </dl>
- <a name="extract_005fextradata"></a>
- <h3 class="section">18.10 extract_extradata<span class="pull-right"><a class="anchor hidden-xs" href="#extract_005fextradata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-extract_005fextradata" aria-hidden="true">TOC</a></span></h3>
- <p>Extract the in-band extradata.
- </p>
- <p>Certain codecs allow the long-term headers (e.g. MPEG-2 sequence headers,
- or H.264/HEVC (VPS/)SPS/PPS) to be transmitted either "in-band" (i.e. as a part
- of the bitstream containing the coded frames) or "out of band" (e.g. on the
- container level). This latter form is called "extradata" in FFmpeg terminology.
- </p>
- <p>This bitstream filter detects the in-band headers and makes them available as
- extradata.
- </p>
- <dl class="table">
- <dt><samp class="option">remove</samp></dt>
- <dd><p>When this option is enabled, the long-term headers are removed from the
- bitstream after extraction.
- </p></dd>
- </dl>
- <a name="filter_005funits"></a>
- <h3 class="section">18.11 filter_units<span class="pull-right"><a class="anchor hidden-xs" href="#filter_005funits" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-filter_005funits" aria-hidden="true">TOC</a></span></h3>
- <p>Remove units with types in or not in a given set from the stream.
- </p>
- <dl class="table">
- <dt><samp class="option">pass_types</samp></dt>
- <dd><p>List of unit types or ranges of unit types to pass through while removing
- all others. This is specified as a ’|’-separated list of unit type values
- or ranges of values with ’-’.
- </p>
- </dd>
- <dt><samp class="option">remove_types</samp></dt>
- <dd><p>Identical to <samp class="option">pass_types</samp>, except the units in the given set
- removed and all others passed through.
- </p></dd>
- </dl>
- <p>The types used by pass_types and remove_types correspond to NAL unit types
- (nal_unit_type) in H.264, HEVC and H.266 (see Table 7-1 in the H.264
- and HEVC specifications or Table 5 in the H.266 specification), to
- marker values for JPEG (without 0xFF prefix) and to start codes without
- start code prefix (i.e. the byte following the 0x000001) for MPEG-2.
- For VP8 and VP9, every unit has type zero.
- </p>
- <p>Extradata is unchanged by this transformation, but note that if the stream
- contains inline parameter sets then the output may be unusable if they are
- removed.
- </p>
- <p>For example, to remove all non-VCL NAL units from an H.264 stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=pass_types=1-5' OUTPUT
- </pre></div>
- <p>To remove all AUDs, SEI and filler from an H.265 stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT
- </pre></div>
- <p>To remove all user data from a MPEG-2 stream, including Closed Captions:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=178' OUTPUT
- </pre></div>
- <p>To remove all SEI from a H264 stream, including Closed Captions:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=6' OUTPUT
- </pre></div>
- <p>To remove all prefix and suffix SEI from a HEVC stream, including Closed Captions and dynamic HDR:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=39|40' OUTPUT
- </pre></div>
- <a name="hapqa_005fextract"></a>
- <h3 class="section">18.12 hapqa_extract<span class="pull-right"><a class="anchor hidden-xs" href="#hapqa_005fextract" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hapqa_005fextract" aria-hidden="true">TOC</a></span></h3>
- <p>Extract Rgb or Alpha part of an HAPQA file, without recompression, in order to create an HAPQ or an HAPAlphaOnly file.
- </p>
- <dl class="table">
- <dt><samp class="option">texture</samp></dt>
- <dd><p>Specifies the texture to keep.
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dt><samp class="option">alpha</samp></dt>
- </dl>
- </dd>
- </dl>
- <p>Convert HAPQA to HAPQ
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=color -tag:v HapY -metadata:s:v:0 encoder="HAPQ" hapq_file.mov
- </pre></div>
- <p>Convert HAPQA to HAPAlphaOnly
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=alpha -tag:v HapA -metadata:s:v:0 encoder="HAPAlpha Only" hapalphaonly_file.mov
- </pre></div>
- <a name="h264_005fmetadata"></a>
- <h3 class="section">18.13 h264_metadata<span class="pull-right"><a class="anchor hidden-xs" href="#h264_005fmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-h264_005fmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>Modify metadata embedded in an H.264 stream.
- </p>
- <dl class="table">
- <dt><samp class="option">aud</samp></dt>
- <dd><p>Insert or remove AUD NAL units in all access units of the stream.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">pass</samp>’</dt>
- <dt>‘<samp class="samp">insert</samp>’</dt>
- <dt>‘<samp class="samp">remove</samp>’</dt>
- </dl>
- <p>Default is pass.
- </p>
- </dd>
- <dt><samp class="option">sample_aspect_ratio</samp></dt>
- <dd><p>Set the sample aspect ratio of the stream in the VUI parameters.
- See H.264 table E-1.
- </p>
- </dd>
- <dt><samp class="option">overscan_appropriate_flag</samp></dt>
- <dd><p>Set whether the stream is suitable for display using overscan
- or not (see H.264 section E.2.1).
- </p>
- </dd>
- <dt><samp class="option">video_format</samp></dt>
- <dt><samp class="option">video_full_range_flag</samp></dt>
- <dd><p>Set the video format in the stream (see H.264 section E.2.1 and
- table E-2).
- </p>
- </dd>
- <dt><samp class="option">colour_primaries</samp></dt>
- <dt><samp class="option">transfer_characteristics</samp></dt>
- <dt><samp class="option">matrix_coefficients</samp></dt>
- <dd><p>Set the colour description in the stream (see H.264 section E.2.1
- and tables E-3, E-4 and E-5).
- </p>
- </dd>
- <dt><samp class="option">chroma_sample_loc_type</samp></dt>
- <dd><p>Set the chroma sample location in the stream (see H.264 section
- E.2.1 and figure E-1).
- </p>
- </dd>
- <dt><samp class="option">tick_rate</samp></dt>
- <dd><p>Set the tick rate (time_scale / num_units_in_tick) in the VUI
- parameters. This is the smallest time unit representable in the
- stream, and in many cases represents the field rate of the stream
- (double the frame rate).
- </p></dd>
- <dt><samp class="option">fixed_frame_rate_flag</samp></dt>
- <dd><p>Set whether the stream has fixed framerate - typically this indicates
- that the framerate is exactly half the tick rate, but the exact
- meaning is dependent on interlacing and the picture structure (see
- H.264 section E.2.1 and table E-6).
- </p></dd>
- <dt><samp class="option">zero_new_constraint_set_flags</samp></dt>
- <dd><p>Zero constraint_set4_flag and constraint_set5_flag in the SPS. These
- bits were reserved in a previous version of the H.264 spec, and thus
- some hardware decoders require these to be zero. The result of zeroing
- this is still a valid bitstream.
- </p>
- </dd>
- <dt><samp class="option">crop_left</samp></dt>
- <dt><samp class="option">crop_right</samp></dt>
- <dt><samp class="option">crop_top</samp></dt>
- <dt><samp class="option">crop_bottom</samp></dt>
- <dd><p>Set the frame cropping offsets in the SPS. These values will replace
- the current ones if the stream is already cropped.
- </p>
- <p>These fields are set in pixels. Note that some sizes may not be
- representable if the chroma is subsampled or the stream is interlaced
- (see H.264 section 7.4.2.1.1).
- </p>
- </dd>
- <dt><samp class="option">sei_user_data</samp></dt>
- <dd><p>Insert a string as SEI unregistered user data. The argument must
- be of the form <em class="emph">UUID+string</em>, where the UUID is as hex digits
- possibly separated by hyphens, and the string can be anything.
- </p>
- <p>For example, ‘<samp class="samp">086f3693-b7b3-4f2c-9653-21492feee5b8+hello</samp>’ will
- insert the string “hello” associated with the given UUID.
- </p>
- </dd>
- <dt><samp class="option">delete_filler</samp></dt>
- <dd><p>Deletes both filler NAL units and filler SEI messages.
- </p>
- </dd>
- <dt><samp class="option">display_orientation</samp></dt>
- <dd><p>Insert, extract or remove Display orientation SEI messages.
- See H.264 section D.1.27 and D.2.27 for syntax and semantics.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">pass</samp>’</dt>
- <dt>‘<samp class="samp">insert</samp>’</dt>
- <dt>‘<samp class="samp">remove</samp>’</dt>
- <dt>‘<samp class="samp">extract</samp>’</dt>
- </dl>
- <p>Default is pass.
- </p>
- <p>Insert mode works in conjunction with <code class="code">rotate</code> and <code class="code">flip</code> options.
- Any pre-existing Display orientation messages will be removed in insert or remove mode.
- Extract mode attaches the display matrix to the packet as side data.
- </p>
- </dd>
- <dt><samp class="option">rotate</samp></dt>
- <dd><p>Set rotation in display orientation SEI (anticlockwise angle in degrees).
- Range is -360 to +360. Default is NaN.
- </p>
- </dd>
- <dt><samp class="option">flip</samp></dt>
- <dd><p>Set flip in display orientation SEI.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">horizontal</samp>’</dt>
- <dt>‘<samp class="samp">vertical</samp>’</dt>
- </dl>
- <p>Default is unset.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set the level in the SPS. Refer to H.264 section A.3 and tables A-1
- to A-5.
- </p>
- <p>The argument must be the name of a level (for example, ‘<samp class="samp">4.2</samp>’), a
- level_idc value (for example, ‘<samp class="samp">42</samp>’), or the special name ‘<samp class="samp">auto</samp>’
- indicating that the filter should attempt to guess the level from the
- input stream properties.
- </p>
- </dd>
- </dl>
- <a name="h264_005fmp4toannexb"></a>
- <h3 class="section">18.14 h264_mp4toannexb<span class="pull-right"><a class="anchor hidden-xs" href="#h264_005fmp4toannexb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-h264_005fmp4toannexb" aria-hidden="true">TOC</a></span></h3>
- <p>Convert an H.264 bitstream from length prefixed mode to start code
- prefixed mode (as defined in the Annex B of the ITU-T H.264
- specification).
- </p>
- <p>This is required by some streaming formats, typically the MPEG-2
- transport stream format (muxer <code class="code">mpegts</code>).
- </p>
- <p>For example to remux an MP4 file containing an H.264 stream to mpegts
- format with <code class="command">ffmpeg</code>, you can use the command:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT.mp4 -codec copy -bsf:v h264_mp4toannexb OUTPUT.ts
- </pre></div>
- <p>Please note that this filter is auto-inserted for MPEG-TS (muxer
- <code class="code">mpegts</code>) and raw H.264 (muxer <code class="code">h264</code>) output formats.
- </p>
- <a name="h264_005fredundant_005fpps"></a>
- <h3 class="section">18.15 h264_redundant_pps<span class="pull-right"><a class="anchor hidden-xs" href="#h264_005fredundant_005fpps" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-h264_005fredundant_005fpps" aria-hidden="true">TOC</a></span></h3>
- <p>This applies a specific fixup to some Blu-ray BDMV H264 streams
- which contain redundant PPSs. The PPSs modify irrelevant parameters
- of the stream, confusing other transformations which require
- the correct extradata.
- </p>
- <p>The encoder used on these impacted streams adds extra PPSs throughout
- the stream, varying the initial QP and whether weighted prediction
- was enabled. This causes issues after copying the stream into
- a global header container, as the starting PPS is not suitable
- for the rest of the stream. One side effect, for example,
- is seeking will return garbled output until a new PPS appears.
- </p>
- <p>This BSF removes the extra PPSs and rewrites the slice headers
- such that the stream uses a single leading PPS in the global header,
- which resolves the issue.
- </p>
- <a name="hevc_005fmetadata"></a>
- <h3 class="section">18.16 hevc_metadata<span class="pull-right"><a class="anchor hidden-xs" href="#hevc_005fmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hevc_005fmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>Modify metadata embedded in an HEVC stream.
- </p>
- <dl class="table">
- <dt><samp class="option">aud</samp></dt>
- <dd><p>Insert or remove AUD NAL units in all access units of the stream.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">insert</samp>’</dt>
- <dt>‘<samp class="samp">remove</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">sample_aspect_ratio</samp></dt>
- <dd><p>Set the sample aspect ratio in the stream in the VUI parameters.
- </p>
- </dd>
- <dt><samp class="option">video_format</samp></dt>
- <dt><samp class="option">video_full_range_flag</samp></dt>
- <dd><p>Set the video format in the stream (see H.265 section E.3.1 and
- table E.2).
- </p>
- </dd>
- <dt><samp class="option">colour_primaries</samp></dt>
- <dt><samp class="option">transfer_characteristics</samp></dt>
- <dt><samp class="option">matrix_coefficients</samp></dt>
- <dd><p>Set the colour description in the stream (see H.265 section E.3.1
- and tables E.3, E.4 and E.5).
- </p>
- </dd>
- <dt><samp class="option">chroma_sample_loc_type</samp></dt>
- <dd><p>Set the chroma sample location in the stream (see H.265 section
- E.3.1 and figure E.1).
- </p>
- </dd>
- <dt><samp class="option">tick_rate</samp></dt>
- <dd><p>Set the tick rate in the VPS and VUI parameters (time_scale /
- num_units_in_tick). Combined with <samp class="option">num_ticks_poc_diff_one</samp>, this can
- set a constant framerate in the stream. Note that it is likely to be
- overridden by container parameters when the stream is in a container.
- </p>
- </dd>
- <dt><samp class="option">num_ticks_poc_diff_one</samp></dt>
- <dd><p>Set poc_proportional_to_timing_flag in VPS and VUI and use this value
- to set num_ticks_poc_diff_one_minus1 (see H.265 sections 7.4.3.1 and
- E.3.1). Ignored if <samp class="option">tick_rate</samp> is not also set.
- </p>
- </dd>
- <dt><samp class="option">crop_left</samp></dt>
- <dt><samp class="option">crop_right</samp></dt>
- <dt><samp class="option">crop_top</samp></dt>
- <dt><samp class="option">crop_bottom</samp></dt>
- <dd><p>Set the conformance window cropping offsets in the SPS. These values
- will replace the current ones if the stream is already cropped.
- </p>
- <p>These fields are set in pixels. Note that some sizes may not be
- representable if the chroma is subsampled (H.265 section 7.4.3.2.1).
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dt><samp class="option">height</samp></dt>
- <dd><p>Set width and height after crop.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set the level in the VPS and SPS. See H.265 section A.4 and tables
- A.6 and A.7.
- </p>
- <p>The argument must be the name of a level (for example, ‘<samp class="samp">5.1</samp>’), a
- <em class="emph">general_level_idc</em> value (for example, ‘<samp class="samp">153</samp>’ for level 5.1),
- or the special name ‘<samp class="samp">auto</samp>’ indicating that the filter should
- attempt to guess the level from the input stream properties.
- </p>
- </dd>
- </dl>
- <a name="hevc_005fmp4toannexb"></a>
- <h3 class="section">18.17 hevc_mp4toannexb<span class="pull-right"><a class="anchor hidden-xs" href="#hevc_005fmp4toannexb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hevc_005fmp4toannexb" aria-hidden="true">TOC</a></span></h3>
- <p>Convert an HEVC/H.265 bitstream from length prefixed mode to start code
- prefixed mode (as defined in the Annex B of the ITU-T H.265
- specification).
- </p>
- <p>This is required by some streaming formats, typically the MPEG-2
- transport stream format (muxer <code class="code">mpegts</code>).
- </p>
- <p>For example to remux an MP4 file containing an HEVC stream to mpegts
- format with <code class="command">ffmpeg</code>, you can use the command:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT.mp4 -codec copy -bsf:v hevc_mp4toannexb OUTPUT.ts
- </pre></div>
- <p>Please note that this filter is auto-inserted for MPEG-TS (muxer
- <code class="code">mpegts</code>) and raw HEVC/H.265 (muxer <code class="code">h265</code> or
- <code class="code">hevc</code>) output formats.
- </p>
- <a name="imxdump"></a>
- <h3 class="section">18.18 imxdump<span class="pull-right"><a class="anchor hidden-xs" href="#imxdump" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-imxdump" aria-hidden="true">TOC</a></span></h3>
- <p>Modifies the bitstream to fit in MOV and to be usable by the Final Cut
- Pro decoder. This filter only applies to the mpeg2video codec, and is
- likely not needed for Final Cut Pro 7 and newer with the appropriate
- <samp class="option">-tag:v</samp>.
- </p>
- <p>For example, to remux 30 MB/sec NTSC IMX to MOV:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mxf -c copy -bsf:v imxdump -tag:v mx3n output.mov
- </pre></div>
- <a name="mjpeg2jpeg"></a>
- <h3 class="section">18.19 mjpeg2jpeg<span class="pull-right"><a class="anchor hidden-xs" href="#mjpeg2jpeg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mjpeg2jpeg" aria-hidden="true">TOC</a></span></h3>
- <p>Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.
- </p>
- <p>MJPEG is a video codec wherein each video frame is essentially a
- JPEG image. The individual frames can be extracted without loss,
- e.g. by
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i ../some_mjpeg.avi -c:v copy frames_%d.jpg
- </pre></div>
- <p>Unfortunately, these chunks are incomplete JPEG images, because
- they lack the DHT segment required for decoding. Quoting from
- <a class="url" href="http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml">http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml</a>:
- </p>
- <p>Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
- commented that "MJPEG, or at least the MJPEG in AVIs having the
- MJPG fourcc, is restricted JPEG with a fixed – and *omitted* –
- Huffman table. The JPEG must be YCbCr colorspace, it must be 4:2:2,
- and it must use basic Huffman encoding, not arithmetic or
- progressive. . . . You can indeed extract the MJPEG frames and
- decode them with a regular JPEG decoder, but you have to prepend
- the DHT segment to them, or else the decoder won’t have any idea
- how to decompress the data. The exact table necessary is given in
- the OpenDML spec."
- </p>
- <p>This bitstream filter patches the header of frames extracted from an MJPEG
- stream (carrying the AVI1 header ID and lacking a DHT segment) to
- produce fully qualified JPEG images.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i mjpeg-movie.avi -c:v copy -bsf:v mjpeg2jpeg frame_%d.jpg
- exiftran -i -9 frame*.jpg
- ffmpeg -i frame_%d.jpg -c:v copy rotated.avi
- </pre></div>
- <a name="mjpegadump"></a>
- <h3 class="section">18.20 mjpegadump<span class="pull-right"><a class="anchor hidden-xs" href="#mjpegadump" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mjpegadump" aria-hidden="true">TOC</a></span></h3>
- <p>Add an MJPEG A header to the bitstream, to enable decoding by
- Quicktime.
- </p>
- <a class="anchor" id="mov2textsub"></a><a name="mov2textsub-1"></a>
- <h3 class="section">18.21 mov2textsub<span class="pull-right"><a class="anchor hidden-xs" href="#mov2textsub-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mov2textsub-1" aria-hidden="true">TOC</a></span></h3>
- <p>Extract a representable text file from MOV subtitles, stripping the
- metadata header from each subtitle packet.
- </p>
- <p>See also the <a class="ref" href="#text2movsub">text2movsub</a> filter.
- </p>
- <a name="mpeg2_005fmetadata"></a>
- <h3 class="section">18.22 mpeg2_metadata<span class="pull-right"><a class="anchor hidden-xs" href="#mpeg2_005fmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpeg2_005fmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>Modify metadata embedded in an MPEG-2 stream.
- </p>
- <dl class="table">
- <dt><samp class="option">display_aspect_ratio</samp></dt>
- <dd><p>Set the display aspect ratio in the stream.
- </p>
- <p>The following fixed values are supported:
- </p><dl class="table">
- <dt><samp class="option">4/3</samp></dt>
- <dt><samp class="option">16/9</samp></dt>
- <dt><samp class="option">221/100</samp></dt>
- </dl>
- <p>Any other value will result in square pixels being signalled instead
- (see H.262 section 6.3.3 and table 6-3).
- </p>
- </dd>
- <dt><samp class="option">frame_rate</samp></dt>
- <dd><p>Set the frame rate in the stream. This is constructed from a table
- of known values combined with a small multiplier and divisor - if
- the supplied value is not exactly representable, the nearest
- representable value will be used instead (see H.262 section 6.3.3
- and table 6-4).
- </p>
- </dd>
- <dt><samp class="option">video_format</samp></dt>
- <dd><p>Set the video format in the stream (see H.262 section 6.3.6 and
- table 6-6).
- </p>
- </dd>
- <dt><samp class="option">colour_primaries</samp></dt>
- <dt><samp class="option">transfer_characteristics</samp></dt>
- <dt><samp class="option">matrix_coefficients</samp></dt>
- <dd><p>Set the colour description in the stream (see H.262 section 6.3.6
- and tables 6-7, 6-8 and 6-9).
- </p>
- </dd>
- </dl>
- <a name="mpeg4_005funpack_005fbframes"></a>
- <h3 class="section">18.23 mpeg4_unpack_bframes<span class="pull-right"><a class="anchor hidden-xs" href="#mpeg4_005funpack_005fbframes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpeg4_005funpack_005fbframes" aria-hidden="true">TOC</a></span></h3>
- <p>Unpack DivX-style packed B-frames.
- </p>
- <p>DivX-style packed B-frames are not valid MPEG-4 and were only a
- workaround for the broken Video for Windows subsystem.
- They use more space, can cause minor AV sync issues, require more
- CPU power to decode (unless the player has some decoded picture queue
- to compensate the 2,0,2,0 frame per packet style) and cause
- trouble if copied into a standard container like mp4 or mpeg-ps/ts,
- because MPEG-4 decoders may not be able to decode them, since they are
- not valid MPEG-4.
- </p>
- <p>For example to fix an AVI file containing an MPEG-4 stream with
- DivX-style packed B-frames using <code class="command">ffmpeg</code>, you can use the command:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4_unpack_bframes OUTPUT.avi
- </pre></div>
- <a name="noise"></a>
- <h3 class="section">18.24 noise<span class="pull-right"><a class="anchor hidden-xs" href="#noise" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-noise" aria-hidden="true">TOC</a></span></h3>
- <p>Damages the contents of packets or simply drops them without damaging the
- container. Can be used for fuzzing or testing error resilience/concealment.
- </p>
- <p>Parameters:
- </p><dl class="table">
- <dt><samp class="option">amount</samp></dt>
- <dd><p>Accepts an expression whose evaluation per-packet determines how often bytes in that
- packet will be modified. A value below 0 will result in a variable frequency.
- Default is 0 which results in no modification. However, if neither amount nor drop is specified,
- amount will be set to <var class="var">-1</var>. See below for accepted variables.
- </p></dd>
- <dt><samp class="option">drop</samp></dt>
- <dd><p>Accepts an expression evaluated per-packet whose value determines whether that packet is dropped.
- Evaluation to a positive value results in the packet being dropped. Evaluation to a negative
- value results in a variable chance of it being dropped, roughly inverse in proportion to the magnitude
- of the value. Default is 0 which results in no drops. See below for accepted variables.
- </p></dd>
- <dt><samp class="option">dropamount</samp></dt>
- <dd><p>Accepts a non-negative integer, which assigns a variable chance of it being dropped, roughly inverse
- in proportion to the value. Default is 0 which results in no drops. This option is kept for backwards
- compatibility and is equivalent to setting drop to a negative value with the same magnitude
- i.e. <code class="code">dropamount=4</code> is the same as <code class="code">drop=-4</code>. Ignored if drop is also specified.
- </p></dd>
- </dl>
- <p>Both <code class="code">amount</code> and <code class="code">drop</code> accept expressions containing the following variables:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">n</samp>’</dt>
- <dd><p>The index of the packet, starting from zero.
- </p></dd>
- <dt>‘<samp class="samp">tb</samp>’</dt>
- <dd><p>The timebase for packet timestamps.
- </p></dd>
- <dt>‘<samp class="samp">pts</samp>’</dt>
- <dd><p>Packet presentation timestamp.
- </p></dd>
- <dt>‘<samp class="samp">dts</samp>’</dt>
- <dd><p>Packet decoding timestamp.
- </p></dd>
- <dt>‘<samp class="samp">nopts</samp>’</dt>
- <dd><p>Constant representing AV_NOPTS_VALUE.
- </p></dd>
- <dt>‘<samp class="samp">startpts</samp>’</dt>
- <dd><p>First non-AV_NOPTS_VALUE PTS seen in the stream.
- </p></dd>
- <dt>‘<samp class="samp">startdts</samp>’</dt>
- <dd><p>First non-AV_NOPTS_VALUE DTS seen in the stream.
- </p></dd>
- <dt>‘<samp class="samp">duration</samp>’</dt>
- <dt>‘<samp class="samp">d</samp>’</dt>
- <dd><p>Packet duration, in timebase units.
- </p></dd>
- <dt>‘<samp class="samp">pos</samp>’</dt>
- <dd><p>Packet position in input; may be -1 when unknown or not set.
- </p></dd>
- <dt>‘<samp class="samp">size</samp>’</dt>
- <dd><p>Packet size, in bytes.
- </p></dd>
- <dt>‘<samp class="samp">key</samp>’</dt>
- <dd><p>Whether packet is marked as a keyframe.
- </p></dd>
- <dt>‘<samp class="samp">state</samp>’</dt>
- <dd><p>A pseudo random integer, primarily derived from the content of packet payload.
- </p></dd>
- </dl>
- <a name="Examples-7"></a>
- <h4 class="subsection">18.24.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-7" aria-hidden="true">TOC</a></span></h4>
- <p>Apply modification to every byte but don’t drop any packets.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c copy -bsf noise=1 output.mkv
- </pre></div>
- <p>Drop every video packet not marked as a keyframe after timestamp 30s but do not
- modify any of the remaining packets.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c copy -bsf:v noise=drop='gt(pts*tb\,30)*not(key)' output.mkv
- </pre></div>
- <p>Drop one second of audio every 10 seconds and add some random noise to the rest.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c copy -bsf:a noise=amount=-1:drop='between(mod(pts*tb\,10)\,9\,10)' output.mkv
- </pre></div>
- <a name="null"></a>
- <h3 class="section">18.25 null<span class="pull-right"><a class="anchor hidden-xs" href="#null" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-null" aria-hidden="true">TOC</a></span></h3>
- <p>This bitstream filter passes the packets through unchanged.
- </p>
- <a name="pcm_005frechunk"></a>
- <h3 class="section">18.26 pcm_rechunk<span class="pull-right"><a class="anchor hidden-xs" href="#pcm_005frechunk" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pcm_005frechunk" aria-hidden="true">TOC</a></span></h3>
- <p>Repacketize PCM audio to a fixed number of samples per packet or a fixed packet
- rate per second. This is similar to the <a data-manual="ffmpeg-filters" href="ffmpeg-filters.html#asetnsamples">asetnsamples audio
- filter</a> but works on audio packets instead of audio frames.
- </p>
- <dl class="table">
- <dt><samp class="option">nb_out_samples, n</samp></dt>
- <dd><p>Set the number of samples per each output audio packet. The number is intended
- as the number of samples <em class="emph">per each channel</em>. Default value is 1024.
- </p>
- </dd>
- <dt><samp class="option">pad, p</samp></dt>
- <dd><p>If set to 1, the filter will pad the last audio packet with silence, so that it
- will contain the same number of samples (or roughly the same number of samples,
- see <samp class="option">frame_rate</samp>) as the previous ones. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">frame_rate, r</samp></dt>
- <dd><p>This option makes the filter output a fixed number of packets per second instead
- of a fixed number of samples per packet. If the audio sample rate is not
- divisible by the frame rate then the number of samples will not be constant but
- will vary slightly so that each packet will start as close to the frame
- boundary as possible. Using this option has precedence over <samp class="option">nb_out_samples</samp>.
- </p></dd>
- </dl>
- <p>You can generate the well known 1602-1601-1602-1601-1602 pattern of 48kHz audio
- for NTSC frame rate using the <samp class="option">frame_rate</samp> option.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i sine=r=48000:d=1 -c pcm_s16le -bsf pcm_rechunk=r=30000/1001 -f framecrc -
- </pre></div>
- <a name="pgs_005fframe_005fmerge"></a>
- <h3 class="section">18.27 pgs_frame_merge<span class="pull-right"><a class="anchor hidden-xs" href="#pgs_005fframe_005fmerge" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pgs_005fframe_005fmerge" aria-hidden="true">TOC</a></span></h3>
- <p>Merge a sequence of PGS Subtitle segments ending with an "end of display set"
- segment into a single packet.
- </p>
- <p>This is required by some containers that support PGS subtitles
- (muxer <code class="code">matroska</code>).
- </p>
- <a name="prores_005fmetadata"></a>
- <h3 class="section">18.28 prores_metadata<span class="pull-right"><a class="anchor hidden-xs" href="#prores_005fmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-prores_005fmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>Modify color property metadata embedded in prores stream.
- </p>
- <dl class="table">
- <dt><samp class="option">color_primaries</samp></dt>
- <dd><p>Set the color primaries.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same color primaries property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT601 625
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>BT601 525
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dt>‘<samp class="samp">smpte431</samp>’</dt>
- <dd><p>DCI P3
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte432</samp>’</dt>
- <dd><p>P3 D65
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">transfer_characteristics</samp></dt>
- <dd><p>Set the color transfer.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same transfer characteristics property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT 601, BT 709, BT 2020
- </p></dd>
- <dt>‘<samp class="samp">smpte2084</samp>’</dt>
- <dd><p>SMPTE ST 2084
- </p></dd>
- <dt>‘<samp class="samp">arib-std-b67</samp>’</dt>
- <dd><p>ARIB STD-B67
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">matrix_coefficients</samp></dt>
- <dd><p>Set the matrix coefficient.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same colorspace property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>BT 601
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020nc</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <p>Set Rec709 colorspace for each frame of the file
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709 output.mov
- </pre></div>
- <p>Set Hybrid Log-Gamma parameters for each frame of the file
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt2020:color_trc=arib-std-b67:colorspace=bt2020nc output.mov
- </pre></div>
- <a name="remove_005fextra"></a>
- <h3 class="section">18.29 remove_extra<span class="pull-right"><a class="anchor hidden-xs" href="#remove_005fextra" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-remove_005fextra" aria-hidden="true">TOC</a></span></h3>
- <p>Remove extradata from packets.
- </p>
- <p>It accepts the following parameter:
- </p><dl class="table">
- <dt><samp class="option">freq</samp></dt>
- <dd><p>Set which frame types to remove extradata from.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">k</samp>’</dt>
- <dd><p>Remove extradata from non-keyframes only.
- </p>
- </dd>
- <dt>‘<samp class="samp">keyframe</samp>’</dt>
- <dd><p>Remove extradata from keyframes only.
- </p>
- </dd>
- <dt>‘<samp class="samp">e, all</samp>’</dt>
- <dd><p>Remove extradata from all frames.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="setts"></a>
- <h3 class="section">18.30 setts<span class="pull-right"><a class="anchor hidden-xs" href="#setts" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-setts" aria-hidden="true">TOC</a></span></h3>
- <p>Set PTS and DTS in packets.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">ts</samp></dt>
- <dt><samp class="option">pts</samp></dt>
- <dt><samp class="option">dts</samp></dt>
- <dd><p>Set expressions for PTS, DTS or both.
- </p></dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>Set expression for duration.
- </p></dd>
- <dt><samp class="option">time_base</samp></dt>
- <dd><p>Set output time base.
- </p></dd>
- <dt><samp class="option">prescale</samp></dt>
- <dd><p>Set whether to convert time fields to user-set output time base before evaluation of expressions. Defaults to 0.
- </p></dd>
- </dl>
- <p>The expressions are evaluated through the eval API and can contain the following
- constants:
- </p>
- <dl class="table">
- <dt><samp class="option">N</samp></dt>
- <dd><p>The count of the input packet. Starting from 0.
- </p>
- </dd>
- <dt><samp class="option">TS</samp></dt>
- <dd><p>The demux timestamp in input in case of <code class="code">ts</code> or <code class="code">dts</code> option or presentation
- timestamp in case of <code class="code">pts</code> option.
- </p>
- </dd>
- <dt><samp class="option">POS</samp></dt>
- <dd><p>The original position in the file of the packet, or undefined if undefined
- for the current packet
- </p>
- </dd>
- <dt><samp class="option">DTS</samp></dt>
- <dd><p>The demux timestamp in input.
- </p>
- </dd>
- <dt><samp class="option">PTS</samp></dt>
- <dd><p>The presentation timestamp in input.
- </p>
- </dd>
- <dt><samp class="option">DURATION</samp></dt>
- <dd><p>The duration in input.
- </p>
- </dd>
- <dt><samp class="option">STARTDTS</samp></dt>
- <dd><p>The DTS of the first packet.
- </p>
- </dd>
- <dt><samp class="option">STARTPTS</samp></dt>
- <dd><p>The PTS of the first packet.
- </p>
- </dd>
- <dt><samp class="option">PREV_INDTS</samp></dt>
- <dd><p>The previous input DTS.
- </p>
- </dd>
- <dt><samp class="option">PREV_INPTS</samp></dt>
- <dd><p>The previous input PTS.
- </p>
- </dd>
- <dt><samp class="option">PREV_INDURATION</samp></dt>
- <dd><p>The previous input duration.
- </p>
- </dd>
- <dt><samp class="option">PREV_OUTDTS</samp></dt>
- <dd><p>The previous output DTS.
- </p>
- </dd>
- <dt><samp class="option">PREV_OUTPTS</samp></dt>
- <dd><p>The previous output PTS.
- </p>
- </dd>
- <dt><samp class="option">PREV_OUTDURATION</samp></dt>
- <dd><p>The previous output duration.
- </p>
- </dd>
- <dt><samp class="option">NEXT_DTS</samp></dt>
- <dd><p>The next input DTS.
- </p>
- </dd>
- <dt><samp class="option">NEXT_PTS</samp></dt>
- <dd><p>The next input PTS.
- </p>
- </dd>
- <dt><samp class="option">NEXT_DURATION</samp></dt>
- <dd><p>The next input duration.
- </p>
- </dd>
- <dt><samp class="option">TB</samp></dt>
- <dd><p>The timebase in which time fields are denominated. The user-set output timebase if prescale is enabled, else the input timebase.
- </p>
- </dd>
- <dt><samp class="option">TB_OUT</samp></dt>
- <dd><p>The output timebase.
- </p>
- </dd>
- <dt><samp class="option">SR</samp></dt>
- <dd><p>The sample rate of stream packet belongs.
- </p>
- </dd>
- <dt><samp class="option">NOPTS</samp></dt>
- <dd><p>The AV_NOPTS_VALUE constant.
- </p></dd>
- </dl>
- <p>For example, to set PTS equal to DTS (not recommended if B-frames are involved):
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:a copy -bsf:a setts=pts=DTS out.mkv
- </pre></div>
- <a name="showinfo"></a>
- <h3 class="section">18.31 showinfo<span class="pull-right"><a class="anchor hidden-xs" href="#showinfo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showinfo" aria-hidden="true">TOC</a></span></h3>
- <p>Log basic packet information. Mainly useful for testing, debugging,
- and development.
- </p>
- <a name="smpte436m_005fto_005feia608"></a>
- <h3 class="section">18.32 smpte436m_to_eia608<span class="pull-right"><a class="anchor hidden-xs" href="#smpte436m_005fto_005feia608" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-smpte436m_005fto_005feia608" aria-hidden="true">TOC</a></span></h3>
- <p>Convert from a <code class="code">SMPTE_436M_ANC</code> data stream to a <code class="code">EIA_608</code> stream,
- extracting the closed captions from CTA-708 CDP VANC packets, and ignoring all other data.
- </p>
- <a class="anchor" id="text2movsub"></a><a name="text2movsub-1"></a>
- <h3 class="section">18.33 text2movsub<span class="pull-right"><a class="anchor hidden-xs" href="#text2movsub-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-text2movsub-1" aria-hidden="true">TOC</a></span></h3>
- <p>Convert text subtitles to MOV subtitles (as used by the <code class="code">mov_text</code>
- codec) with metadata headers.
- </p>
- <p>See also the <a class="ref" href="#mov2textsub">mov2textsub</a> filter.
- </p>
- <a name="trace_005fheaders"></a>
- <h3 class="section">18.34 trace_headers<span class="pull-right"><a class="anchor hidden-xs" href="#trace_005fheaders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-trace_005fheaders" aria-hidden="true">TOC</a></span></h3>
- <p>Log trace output containing all syntax elements in the coded stream
- headers (everything above the level of individual coded blocks).
- This can be useful for debugging low-level stream issues.
- </p>
- <p>Supports AV1, H.264, H.265, (M)JPEG, MPEG-2 and VP9, but depending
- on the build only a subset of these may be available.
- </p>
- <a name="truehd_005fcore"></a>
- <h3 class="section">18.35 truehd_core<span class="pull-right"><a class="anchor hidden-xs" href="#truehd_005fcore" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-truehd_005fcore" aria-hidden="true">TOC</a></span></h3>
- <p>Extract the core from a TrueHD stream, dropping ATMOS data.
- </p>
- <a name="vp9_005fmetadata"></a>
- <h3 class="section">18.36 vp9_metadata<span class="pull-right"><a class="anchor hidden-xs" href="#vp9_005fmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vp9_005fmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>Modify metadata embedded in a VP9 stream.
- </p>
- <dl class="table">
- <dt><samp class="option">color_space</samp></dt>
- <dd><p>Set the color space value in the frame header. Note that any frame
- set to RGB will be implicitly set to PC range and that RGB is
- incompatible with profiles 0 and 2.
- </p><dl class="table">
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">bt601</samp>’</dt>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">smpte170</samp>’</dt>
- <dt>‘<samp class="samp">smpte240</samp>’</dt>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dt>‘<samp class="samp">rgb</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">color_range</samp></dt>
- <dd><p>Set the color range value in the frame header. Note that any value
- imposed by the color space will take precedence over this value.
- </p><dl class="table">
- <dt>‘<samp class="samp">tv</samp>’</dt>
- <dt>‘<samp class="samp">pc</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="vp9_005fsuperframe"></a>
- <h3 class="section">18.37 vp9_superframe<span class="pull-right"><a class="anchor hidden-xs" href="#vp9_005fsuperframe" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vp9_005fsuperframe" aria-hidden="true">TOC</a></span></h3>
- <p>Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This
- fixes merging of split/segmented VP9 streams where the alt-ref frame
- was split from its visible counterpart.
- </p>
- <a name="vp9_005fsuperframe_005fsplit"></a>
- <h3 class="section">18.38 vp9_superframe_split<span class="pull-right"><a class="anchor hidden-xs" href="#vp9_005fsuperframe_005fsplit" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vp9_005fsuperframe_005fsplit" aria-hidden="true">TOC</a></span></h3>
- <p>Split VP9 superframes into single frames.
- </p>
- <a name="vp9_005fraw_005freorder"></a>
- <h3 class="section">18.39 vp9_raw_reorder<span class="pull-right"><a class="anchor hidden-xs" href="#vp9_005fraw_005freorder" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vp9_005fraw_005freorder" aria-hidden="true">TOC</a></span></h3>
- <p>Given a VP9 stream with correct timestamps but possibly out of order,
- insert additional show-existing-frame packets to correct the ordering.
- </p>
- <a name="Format-Options"></a>
- <h2 class="chapter">19 Format Options<span class="pull-right"><a class="anchor hidden-xs" href="#Format-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Format-Options" aria-hidden="true">TOC</a></span></h2>
- <p>The libavformat library provides some generic global options, which
- can be set on all the muxers and demuxers. In addition each muxer or
- demuxer may support so-called private options, which are specific for
- that component.
- </p>
- <p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
- FFmpeg tools, or by setting the value explicitly in the
- <code class="code">AVFormatContext</code> options or using the <samp class="file">libavutil/opt.h</samp> API
- for programmatic use.
- </p>
- <p>The list of supported options follows:
- </p>
- <dl class="table">
- <dt><samp class="option">avioflags <var class="var">flags</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">direct</samp>’</dt>
- <dd><p>Reduce buffering.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">probesize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set probing size in bytes, i.e. the size of the data to analyze to get
- stream information. A higher value will enable detecting more
- information in case it is dispersed into the stream, but will increase
- latency. Must be an integer not lesser than 32. It is 5000000 by default.
- </p>
- </dd>
- <dt><samp class="option">max_probe_packets <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set the maximum number of buffered packets when probing a codec.
- Default is 2500 packets.
- </p>
- </dd>
- <dt><samp class="option">packetsize <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set packet size.
- </p>
- </dd>
- <dt><samp class="option">fflags <var class="var">flags</var></samp></dt>
- <dd><p>Set format flags. Some are implemented for a limited number of formats.
- </p>
- <p>Possible values for input files:
- </p><dl class="table">
- <dt>‘<samp class="samp">discardcorrupt</samp>’</dt>
- <dd><p>Discard corrupted packets.
- </p></dd>
- <dt>‘<samp class="samp">fastseek</samp>’</dt>
- <dd><p>Enable fast, but inaccurate seeks for some formats.
- </p></dd>
- <dt>‘<samp class="samp">genpts</samp>’</dt>
- <dd><p>Generate missing PTS if DTS is present.
- </p></dd>
- <dt>‘<samp class="samp">igndts</samp>’</dt>
- <dd><p>Ignore DTS if PTS is also set. In case the PTS is set, the DTS value
- is set to NOPTS. This is ignored when the <code class="code">nofillin</code> flag is set.
- </p></dd>
- <dt>‘<samp class="samp">ignidx</samp>’</dt>
- <dd><p>Ignore index.
- </p></dd>
- <dt>‘<samp class="samp">nobuffer</samp>’</dt>
- <dd><p>Reduce the latency introduced by buffering during initial input streams analysis.
- </p></dd>
- <dt>‘<samp class="samp">nofillin</samp>’</dt>
- <dd><p>Do not fill in missing values in packet fields that can be exactly calculated.
- </p></dd>
- <dt>‘<samp class="samp">noparse</samp>’</dt>
- <dd><p>Disable AVParsers, this needs <code class="code">+nofillin</code> too.
- </p></dd>
- <dt>‘<samp class="samp">sortdts</samp>’</dt>
- <dd><p>Try to interleave output packets by DTS. At present, available only for AVIs with an index.
- </p></dd>
- </dl>
- <p>Possible values for output files:
- </p><dl class="table">
- <dt>‘<samp class="samp">autobsf</samp>’</dt>
- <dd><p>Automatically apply bitstream filters as required by the output format. Enabled by default.
- </p></dd>
- <dt>‘<samp class="samp">bitexact</samp>’</dt>
- <dd><p>Only write platform-, build- and time-independent data.
- This ensures that file and data checksums are reproducible and match between
- platforms. Its primary use is for regression testing.
- </p></dd>
- <dt>‘<samp class="samp">flush_packets</samp>’</dt>
- <dd><p>Write out packets immediately.
- </p></dd>
- <dt>‘<samp class="samp">shortest</samp>’</dt>
- <dd><p>Stop muxing at the end of the shortest stream.
- It may be needed to increase max_interleave_delta to avoid flushing the longer
- streams before EOF.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">seek2any <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Allow seeking to non-keyframes on demuxer level when supported if set to 1.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">analyzeduration <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Specify how many microseconds are analyzed to probe the input. A
- higher value will enable detecting more accurate information, but will
- increase latency. It defaults to 5,000,000 microseconds = 5 seconds.
- </p>
- </dd>
- <dt><samp class="option">cryptokey <var class="var">hexadecimal string</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set decryption key.
- </p>
- </dd>
- <dt><samp class="option">indexmem <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set max memory used for timestamp index (per stream).
- </p>
- </dd>
- <dt><samp class="option">rtbufsize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set max memory used for buffering real-time frames.
- </p>
- </dd>
- <dt><samp class="option">fdebug <var class="var">flags</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Print specific debug info.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">ts</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">max_delay <var class="var">integer</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Set maximum muxing or demuxing delay in microseconds.
- </p>
- </dd>
- <dt><samp class="option">fpsprobesize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set number of frames used to probe fps.
- </p>
- </dd>
- <dt><samp class="option">audio_preload <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set microseconds by which audio packets should be interleaved earlier.
- </p>
- </dd>
- <dt><samp class="option">chunk_duration <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set microseconds for each chunk.
- </p>
- </dd>
- <dt><samp class="option">chunk_size <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set size in bytes for each chunk.
- </p>
- </dd>
- <dt><samp class="option">err_detect, f_err_detect <var class="var">flags</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set error detection flags. <code class="code">f_err_detect</code> is deprecated and
- should be used only via the <code class="command">ffmpeg</code> tool.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">crccheck</samp>’</dt>
- <dd><p>Verify embedded CRCs.
- </p></dd>
- <dt>‘<samp class="samp">bitstream</samp>’</dt>
- <dd><p>Detect bitstream specification deviations.
- </p></dd>
- <dt>‘<samp class="samp">buffer</samp>’</dt>
- <dd><p>Detect improper bitstream length.
- </p></dd>
- <dt>‘<samp class="samp">explode</samp>’</dt>
- <dd><p>Abort decoding on minor error detection.
- </p></dd>
- <dt>‘<samp class="samp">careful</samp>’</dt>
- <dd><p>Consider things that violate the spec and have not been seen in the
- wild as errors.
- </p></dd>
- <dt>‘<samp class="samp">compliant</samp>’</dt>
- <dd><p>Consider all spec non compliancies as errors.
- </p></dd>
- <dt>‘<samp class="samp">aggressive</samp>’</dt>
- <dd><p>Consider things that a sane encoder should not do as an error.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">max_interleave_delta <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set maximum buffering duration for interleaving. The duration is
- expressed in microseconds, and defaults to 10000000 (10 seconds).
- </p>
- <p>To ensure all the streams are interleaved correctly, libavformat will
- wait until it has at least one packet for each stream before actually
- writing any packets to the output file. When some streams are
- "sparse" (i.e. there are large gaps between successive packets), this
- can result in excessive buffering.
- </p>
- <p>This field specifies the maximum difference between the timestamps of the
- first and the last packet in the muxing queue, above which libavformat
- will output a packet regardless of whether it has queued a packet for all
- the streams.
- </p>
- <p>If set to 0, libavformat will continue buffering packets until it has
- a packet for each stream, regardless of the maximum timestamp
- difference between the buffered packets.
- </p>
- </dd>
- <dt><samp class="option">use_wallclock_as_timestamps <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Use wallclock as timestamps if set to 1. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">avoid_negative_ts <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">make_non_negative</samp>’</dt>
- <dd><p>Shift timestamps to make them non-negative.
- Also note that this affects only leading negative timestamps, and not
- non-monotonic negative timestamps.
- </p></dd>
- <dt>‘<samp class="samp">make_zero</samp>’</dt>
- <dd><p>Shift timestamps so that the first timestamp is 0.
- </p></dd>
- <dt>‘<samp class="samp">auto (default)</samp>’</dt>
- <dd><p>Enables shifting when required by the target format.
- </p></dd>
- <dt>‘<samp class="samp">disabled</samp>’</dt>
- <dd><p>Disables shifting of timestamp.
- </p></dd>
- </dl>
- <p>When shifting is enabled, all output timestamps are shifted by the
- same amount. Audio, video, and subtitles desynching and relative
- timestamp differences are preserved compared to how they would have
- been without shifting.
- </p>
- </dd>
- <dt><samp class="option">skip_initial_bytes <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set number of bytes to skip before reading header and frames if set to 1.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">correct_ts_overflow <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Correct single timestamp overflows if set to 1. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">flush_packets <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Flush the underlying I/O stream after each packet. Default is -1 (auto), which
- means that the underlying protocol will decide, 1 enables it, and has the
- effect of reducing the latency, 0 disables it and may increase IO throughput in
- some cases.
- </p>
- </dd>
- <dt><samp class="option">output_ts_offset <var class="var">offset</var> (<em class="emph">output</em>)</samp></dt>
- <dd><p>Set the output time offset.
- </p>
- <p><var class="var">offset</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>The offset is added by the muxer to the output timestamps.
- </p>
- <p>Specifying a positive offset means that the corresponding streams are
- delayed bt the time duration specified in <var class="var">offset</var>. Default value
- is <code class="code">0</code> (meaning that no offset is applied).
- </p>
- </dd>
- <dt><samp class="option">format_whitelist <var class="var">list</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>"," separated list of allowed demuxers. By default all are allowed.
- </p>
- </dd>
- <dt><samp class="option">dump_separator <var class="var">string</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Separator used to separate the fields printed on the command line about the
- Stream parameters.
- For example, to separate the fields with newlines and indentation:
- </p><div class="example">
- <pre class="example-preformatted">ffprobe -dump_separator "
- " -i ~/videos/matrixbench_mpeg2.mpg
- </pre></div>
- </dd>
- <dt><samp class="option">max_streams <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Specifies the maximum number of streams. This can be used to reject files that
- would require too many resources due to a large number of streams.
- </p>
- </dd>
- <dt><samp class="option">skip_estimate_duration_from_pts <var class="var">bool</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Skip estimation of input duration if it requires an additional probing for PTS at end of file.
- At present, applicable for MPEG-PS and MPEG-TS.
- </p>
- </dd>
- <dt><samp class="option">duration_probesize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set probing size, in bytes, for input duration estimation when it actually requires
- an additional probing for PTS at end of file (at present: MPEG-PS and MPEG-TS).
- It is aimed at users interested in better durations probing for itself, or indirectly
- because using the concat demuxer, for example.
- The typical use case is an MPEG-TS CBR with a high bitrate, high video buffering and
- ending cleaning with similar PTS for video and audio: in such a scenario, the large
- physical gap between the last video packet and the last audio packet makes it necessary
- to read many bytes in order to get the video stream duration.
- Another use case is where the default probing behaviour only reaches a single video frame which is
- not the last one of the stream due to frame reordering, so the duration is not accurate.
- Setting this option has a performance impact even for small files because the probing
- size is fixed.
- Default behaviour is a general purpose trade-off, largely adaptive, but the probing size
- will not be extended to get streams durations at all costs.
- Must be an integer not lesser than 1, or 0 for default behaviour.
- </p>
- </dd>
- <dt><samp class="option">strict, f_strict <var class="var">integer</var> (<em class="emph">input/output</em>)</samp></dt>
- <dd><p>Specify how strictly to follow the standards. <code class="code">f_strict</code> is deprecated and
- should be used only via the <code class="command">ffmpeg</code> tool.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">very</samp>’</dt>
- <dd><p>strictly conform to an older more strict version of the spec or reference software
- </p></dd>
- <dt>‘<samp class="samp">strict</samp>’</dt>
- <dd><p>strictly conform to all the things in the spec no matter what consequences
- </p></dd>
- <dt>‘<samp class="samp">normal</samp>’</dt>
- <dt>‘<samp class="samp">unofficial</samp>’</dt>
- <dd><p>allow unofficial extensions
- </p></dd>
- <dt>‘<samp class="samp">experimental</samp>’</dt>
- <dd><p>allow non standardized experimental things, experimental
- (unfinished/work in progress/not well tested) decoders and encoders.
- Note: experimental decoders can pose a security risk, do not use this for
- decoding untrusted input.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="Format-stream-specifiers"></a><a name="Format-stream-specifiers-1"></a>
- <h3 class="section">19.1 Format stream specifiers<span class="pull-right"><a class="anchor hidden-xs" href="#Format-stream-specifiers-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Format-stream-specifiers-1" aria-hidden="true">TOC</a></span></h3>
- <p>Format stream specifiers allow selection of one or more streams that
- match specific properties.
- </p>
- <p>The exact semantics of stream specifiers is defined by the
- <code class="code">avformat_match_stream_specifier()</code> function declared in the
- <samp class="file">libavformat/avformat.h</samp> header and documented in the
- <a data-manual="ffmpeg" href="ffmpeg.html#Stream-specifiers">Stream specifiers section in the ffmpeg(1) manual</a>.
- </p>
- <a name="Demuxers"></a>
- <h2 class="chapter">20 Demuxers<span class="pull-right"><a class="anchor hidden-xs" href="#Demuxers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Demuxers" aria-hidden="true">TOC</a></span></h2>
- <p>Demuxers are configured elements in FFmpeg that can read the
- multimedia streams from a particular type of file.
- </p>
- <p>When you configure your FFmpeg build, all the supported demuxers
- are enabled by default. You can list all available ones using the
- configure option <code class="code">--list-demuxers</code>.
- </p>
- <p>You can disable all the demuxers using the configure option
- <code class="code">--disable-demuxers</code>, and selectively enable a single demuxer with
- the option <code class="code">--enable-demuxer=<var class="var">DEMUXER</var></code>, or disable it
- with the option <code class="code">--disable-demuxer=<var class="var">DEMUXER</var></code>.
- </p>
- <p>The option <code class="code">-demuxers</code> of the ff* tools will display the list of
- enabled demuxers. Use <code class="code">-formats</code> to view a combined list of
- enabled demuxers and muxers.
- </p>
- <p>The description of some of the currently available demuxers follows.
- </p>
- <a name="aa"></a>
- <h3 class="section">20.1 aa<span class="pull-right"><a class="anchor hidden-xs" href="#aa" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aa" aria-hidden="true">TOC</a></span></h3>
- <p>Audible Format 2, 3, and 4 demuxer.
- </p>
- <p>This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
- </p>
- <a name="aac-1"></a>
- <h3 class="section">20.2 aac<span class="pull-right"><a class="anchor hidden-xs" href="#aac-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aac-1" aria-hidden="true">TOC</a></span></h3>
- <p>Raw Audio Data Transport Stream AAC demuxer.
- </p>
- <p>This demuxer is used to demux an ADTS input containing a single AAC stream
- alongwith any ID3v1/2 or APE tags in it.
- </p>
- <a name="apng"></a>
- <h3 class="section">20.3 apng<span class="pull-right"><a class="anchor hidden-xs" href="#apng" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apng" aria-hidden="true">TOC</a></span></h3>
- <p>Animated Portable Network Graphics demuxer.
- </p>
- <p>This demuxer is used to demux APNG files.
- All headers, but the PNG signature, up to (but not including) the first
- fcTL chunk are transmitted as extradata.
- Frames are then split as being all the chunks between two fcTL ones, or
- between the last fcTL and IEND chunks.
- </p>
- <dl class="table">
- <dt><samp class="option">-ignore_loop <var class="var">bool</var></samp></dt>
- <dd><p>Ignore the loop variable in the file if set. Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">-max_fps <var class="var">int</var></samp></dt>
- <dd><p>Maximum framerate in frames per second. Default of 0 imposes no limit.
- </p>
- </dd>
- <dt><samp class="option">-default_fps <var class="var">int</var></samp></dt>
- <dd><p>Default framerate in frames per second when none is specified in the file
- (0 meaning as fast as possible). Default is 15.
- </p>
- </dd>
- </dl>
- <a name="asf-1"></a>
- <h3 class="section">20.4 asf<span class="pull-right"><a class="anchor hidden-xs" href="#asf-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asf-1" aria-hidden="true">TOC</a></span></h3>
- <p>Advanced Systems Format demuxer.
- </p>
- <p>This demuxer is used to demux ASF files and MMS network streams.
- </p>
- <dl class="table">
- <dt><samp class="option">-no_resync_search <var class="var">bool</var></samp></dt>
- <dd><p>Do not try to resynchronize by looking for a certain optional start code.
- </p></dd>
- </dl>
- <a class="anchor" id="concat"></a><a name="concat-1"></a>
- <h3 class="section">20.5 concat<span class="pull-right"><a class="anchor hidden-xs" href="#concat-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-concat-1" aria-hidden="true">TOC</a></span></h3>
- <p>Virtual concatenation script demuxer.
- </p>
- <p>This demuxer reads a list of files and other directives from a text file and
- demuxes them one after the other, as if all their packets had been muxed
- together.
- </p>
- <p>The timestamps in the files are adjusted so that the first file starts at 0
- and each next file starts where the previous one finishes. Note that it is
- done globally and may cause gaps if all streams do not have exactly the same
- length.
- </p>
- <p>All files must have the same streams (same codecs, same time base, etc.).
- </p>
- <p>The duration of each file is used to adjust the timestamps of the next file:
- if the duration is incorrect (because it was computed using the bit-rate or
- because the file is truncated, for example), it can cause artifacts. The
- <code class="code">duration</code> directive can be used to override the duration stored in
- each file.
- </p>
- <a name="Syntax-1"></a>
- <h4 class="subsection">20.5.1 Syntax<span class="pull-right"><a class="anchor hidden-xs" href="#Syntax-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Syntax-1" aria-hidden="true">TOC</a></span></h4>
- <p>The script is a text file in extended-ASCII, with one directive per line.
- Empty lines, leading spaces and lines starting with ’#’ are ignored. The
- following directive is recognized:
- </p>
- <dl class="table">
- <dt><samp class="option"><code class="code">file <var class="var">path</var></code></samp></dt>
- <dd><p>Path to a file to read; special characters and spaces must be escaped with
- backslash or single quotes.
- </p>
- <p>All subsequent file-related directives apply to that file.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">ffconcat version 1.0</code></samp></dt>
- <dd><p>Identify the script type and version.
- </p>
- <p>To make FFmpeg recognize the format automatically, this directive must
- appear exactly as is (no extra space or byte-order-mark) on the very first
- line of the script.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">duration <var class="var">dur</var></code></samp></dt>
- <dd><p>Duration of the file. This information can be specified from the file;
- specifying it here may be more efficient or help if the information from the
- file is not available or accurate.
- </p>
- <p>If the duration is set for all files, then it is possible to seek in the
- whole concatenated video.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">inpoint <var class="var">timestamp</var></code></samp></dt>
- <dd><p>In point of the file. When the demuxer opens the file it instantly seeks to the
- specified timestamp. Seeking is done so that all streams can be presented
- successfully at In point.
- </p>
- <p>This directive works best with intra frame codecs, because for non-intra frame
- ones you will usually get extra packets before the actual In point and the
- decoded content will most likely contain frames before In point too.
- </p>
- <p>For each file, packets before the file In point will have timestamps less than
- the calculated start timestamp of the file (negative in case of the first
- file), and the duration of the files (if not specified by the <code class="code">duration</code>
- directive) will be reduced based on their specified In point.
- </p>
- <p>Because of potential packets before the specified In point, packet timestamps
- may overlap between two concatenated files.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">outpoint <var class="var">timestamp</var></code></samp></dt>
- <dd><p>Out point of the file. When the demuxer reaches the specified decoding
- timestamp in any of the streams, it handles it as an end of file condition and
- skips the current and all the remaining packets from all streams.
- </p>
- <p>Out point is exclusive, which means that the demuxer will not output packets
- with a decoding timestamp greater or equal to Out point.
- </p>
- <p>This directive works best with intra frame codecs and formats where all streams
- are tightly interleaved. For non-intra frame codecs you will usually get
- additional packets with presentation timestamp after Out point therefore the
- decoded content will most likely contain frames after Out point too. If your
- streams are not tightly interleaved you may not get all the packets from all
- streams before Out point and you may only will be able to decode the earliest
- stream until Out point.
- </p>
- <p>The duration of the files (if not specified by the <code class="code">duration</code>
- directive) will be reduced based on their specified Out point.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">file_packet_metadata <var class="var">key=value</var></code></samp></dt>
- <dd><p>Metadata of the packets of the file. The specified metadata will be set for
- each file packet. You can specify this directive multiple times to add multiple
- metadata entries.
- This directive is deprecated, use <code class="code">file_packet_meta</code> instead.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">file_packet_meta <var class="var">key</var> <var class="var">value</var></code></samp></dt>
- <dd><p>Metadata of the packets of the file. The specified metadata will be set for
- each file packet. You can specify this directive multiple times to add multiple
- metadata entries.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">option <var class="var">key</var> <var class="var">value</var></code></samp></dt>
- <dd><p>Option to access, open and probe the file.
- Can be present multiple times.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">stream</code></samp></dt>
- <dd><p>Introduce a stream in the virtual file.
- All subsequent stream-related directives apply to the last introduced
- stream.
- Some streams properties must be set in order to allow identifying the
- matching streams in the subfiles.
- If no streams are defined in the script, the streams from the first file are
- copied.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">exact_stream_id <var class="var">id</var></code></samp></dt>
- <dd><p>Set the id of the stream.
- If this directive is given, the string with the corresponding id in the
- subfiles will be used.
- This is especially useful for MPEG-PS (VOB) files, where the order of the
- streams is not reliable.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">stream_meta <var class="var">key</var> <var class="var">value</var></code></samp></dt>
- <dd><p>Metadata for the stream.
- Can be present multiple times.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">stream_codec <var class="var">value</var></code></samp></dt>
- <dd><p>Codec for the stream.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">stream_extradata <var class="var">hex_string</var></code></samp></dt>
- <dd><p>Extradata for the string, encoded in hexadecimal.
- </p>
- </dd>
- <dt><samp class="option"><code class="code">chapter <var class="var">id</var> <var class="var">start</var> <var class="var">end</var></code></samp></dt>
- <dd><p>Add a chapter. <var class="var">id</var> is an unique identifier, possibly small and
- consecutive.
- </p>
- </dd>
- </dl>
- <a name="Options-57"></a>
- <h4 class="subsection">20.5.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-57" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-57" aria-hidden="true">TOC</a></span></h4>
- <p>This demuxer accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">safe</samp></dt>
- <dd><p>If set to 1, reject unsafe file paths and directives.
- A file path is considered safe if it
- does not contain a protocol specification and is relative and all components
- only contain characters from the portable character set (letters, digits,
- period, underscore and hyphen) and have no period at the beginning of a
- component.
- </p>
- <p>If set to 0, any file name is accepted.
- </p>
- <p>The default is 1.
- </p>
- </dd>
- <dt><samp class="option">auto_convert</samp></dt>
- <dd><p>If set to 1, try to perform automatic conversions on packet data to make the
- streams concatenable.
- The default is 1.
- </p>
- <p>Currently, the only conversion is adding the h264_mp4toannexb bitstream
- filter to H.264 streams in MP4 format. This is necessary in particular if
- there are resolution changes.
- </p>
- </dd>
- <dt><samp class="option">segment_time_metadata</samp></dt>
- <dd><p>If set to 1, every packet will contain the <var class="var">lavf.concat.start_time</var> and the
- <var class="var">lavf.concat.duration</var> packet metadata values which are the start_time and
- the duration of the respective file segments in the concatenated output
- expressed in microseconds. The duration metadata is only set if it is known
- based on the concat file.
- The default is 0.
- </p>
- </dd>
- </dl>
- <a name="Examples-8"></a>
- <h4 class="subsection">20.5.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-8" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-8" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use absolute filenames and include some comments:
- <div class="example">
- <pre class="example-preformatted"># my first filename
- file /mnt/share/file-1.wav
- # my second filename including whitespace
- file '/mnt/share/file 2.wav'
- # my third filename including whitespace plus single quote
- file '/mnt/share/file 3'\''.wav'
- </pre></div>
- </li><li>Allow for input format auto-probing, use safe filenames and set the duration of
- the first file:
- <div class="example">
- <pre class="example-preformatted">ffconcat version 1.0
- file file-1.wav
- duration 20.0
- file subdir/file-2.wav
- </pre></div>
- </li></ul>
- <a name="dash-1"></a>
- <h3 class="section">20.6 dash<span class="pull-right"><a class="anchor hidden-xs" href="#dash-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dash-1" aria-hidden="true">TOC</a></span></h3>
- <p>Dynamic Adaptive Streaming over HTTP demuxer.
- </p>
- <p>This demuxer presents all AVStreams found in the manifest.
- By setting the discard flags on AVStreams the caller can decide
- which streams to actually receive.
- Each stream mirrors the <code class="code">id</code> and <code class="code">bandwidth</code> properties from the
- <code class="code"><Representation></code> as metadata keys named "id" and "variant_bitrate" respectively.
- </p>
- <a name="Options-58"></a>
- <h4 class="subsection">20.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-58" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-58" aria-hidden="true">TOC</a></span></h4>
- <p>This demuxer accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">cenc_decryption_key</samp></dt>
- <dd><p>16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
- </p>
- </dd>
- </dl>
- <a name="dvdvideo"></a>
- <h3 class="section">20.7 dvdvideo<span class="pull-right"><a class="anchor hidden-xs" href="#dvdvideo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dvdvideo" aria-hidden="true">TOC</a></span></h3>
- <p>DVD-Video demuxer, powered by libdvdnav and libdvdread.
- </p>
- <p>Can directly ingest DVD titles, specifically sequential PGCs, into
- a conversion pipeline. Menu assets, such as background video or audio,
- can also be demuxed given the menu’s coordinates (at best effort).
- </p>
- <p>Block devices (DVD drives), ISO files, and directory structures are accepted.
- Activate with <code class="code">-f dvdvideo</code> in front of one of these inputs.
- </p>
- <p>This demuxer does NOT have decryption code of any kind. You are on your own
- working with encrypted DVDs, and should not expect support on the matter.
- </p>
- <p>Underlying playback is handled by libdvdnav, and structure parsing by libdvdread.
- FFmpeg must be built with GPL library support available as well as the
- configure switches <code class="code">--enable-libdvdnav</code> and <code class="code">--enable-libdvdread</code>.
- </p>
- <p>You will need to provide either the desired "title number" or exact PGC/PG coordinates.
- Many open-source DVD players and tools can aid in providing this information.
- If not specified, the demuxer will default to title 1 which works for many discs.
- However, due to the flexibility of the format, it is recommended to check manually.
- There are many discs that are authored strangely or with invalid headers.
- </p>
- <p>If the input is a real DVD drive, please note that there are some drives which may
- silently fail on reading bad sectors from the disc, returning random bits instead
- which is effectively corrupt data. This is especially prominent on aging or rotting discs.
- A second pass and integrity checks would be needed to detect the corruption.
- This is not an FFmpeg issue.
- </p>
- <a name="Background"></a>
- <h4 class="subsection">20.7.1 Background<span class="pull-right"><a class="anchor hidden-xs" href="#Background" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Background" aria-hidden="true">TOC</a></span></h4>
- <p>DVD-Video is not a directly accessible, linear container format in the
- traditional sense. Instead, it allows for complex and programmatic playback of
- carefully muxed MPEG-PS streams that are stored in headerless VOB files.
- To the end-user, these streams are known simply as "titles", but the actual
- logical playback sequence is defined by one or more "PGCs", or Program Group Chains,
- within the title. The PGC is in turn comprised of multiple "PGs", or Programs",
- which are the actual video segments (and for a typical video feature, sequentially
- ordered). The PGC structure, along with stream layout and metadata, are stored in
- IFO files that need to be parsed. PGCs can be thought of as playlists in easier terms.
- </p>
- <p>An actual DVD player relies on user GUI interaction via menus and an internal VM
- to drive the direction of demuxing. Generally, the user would either navigate (via menus)
- or automatically be redirected to the PGC of their choice. During this process and
- the subsequent playback, the DVD player’s internal VM also maintains a state and
- executes instructions that can create jumps to different sectors during playback.
- This is why libdvdnav is involved, as a linear read of the MPEG-PS blobs on the
- disc (VOBs) is not enough to produce the right sequence in many cases.
- </p>
- <p>There are many other DVD structures (a long subject) that will not be discussed here.
- NAV packets, in particular, are handled by this demuxer to build accurate timing
- but not emitted as a stream. For a good high-level understanding, refer to:
- <a class="url" href="https://code.videolan.org/videolan/libdvdnav/-/blob/master/doc/dvd_structures">https://code.videolan.org/videolan/libdvdnav/-/blob/master/doc/dvd_structures</a>
- </p>
- <a name="Options-59"></a>
- <h4 class="subsection">20.7.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-59" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-59" aria-hidden="true">TOC</a></span></h4>
- <p>This demuxer accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">title <var class="var">int</var></samp></dt>
- <dd><p>The title number to play. Must be set if <samp class="option">pgc</samp> and <samp class="option">pg</samp> are not set.
- Not applicable to menus.
- Default is 0 (auto), which currently only selects the first available title (title 1)
- and notifies the user about the implications.
- </p>
- </dd>
- <dt><samp class="option">chapter_start <var class="var">int</var></samp></dt>
- <dd><p>The chapter, or PTT (part-of-title), number to start at. Not applicable to menus.
- Default is 1.
- </p>
- </dd>
- <dt><samp class="option">chapter_end <var class="var">int</var></samp></dt>
- <dd><p>The chapter, or PTT (part-of-title), number to end at. Not applicable to menus.
- Default is 0, which is a special value to signal end at the last possible chapter.
- </p>
- </dd>
- <dt><samp class="option">angle <var class="var">int</var></samp></dt>
- <dd><p>The video angle number, referring to what is essentially an additional
- video stream that is composed from alternate frames interleaved in the VOBs.
- Not applicable to menus.
- Default is 1.
- </p>
- </dd>
- <dt><samp class="option">region <var class="var">int</var></samp></dt>
- <dd><p>The region code to use for playback. Some discs may use this to default playback
- at a particular angle in different regions. This option will not affect the region code
- of a real DVD drive, if used as an input. Not applicable to menus.
- Default is 0, "world".
- </p>
- </dd>
- <dt><samp class="option">menu <var class="var">bool</var></samp></dt>
- <dd><p>Demux menu assets instead of navigating a title. Requires exact coordinates
- of the menu (<samp class="option">menu_lu</samp>, <samp class="option">menu_vts</samp>, <samp class="option">pgc</samp>, <samp class="option">pg</samp>).
- Default is false.
- </p>
- </dd>
- <dt><samp class="option">menu_lu <var class="var">int</var></samp></dt>
- <dd><p>The menu language to demux. In DVD, menus are grouped by language.
- Default is 1, the first language unit.
- </p>
- </dd>
- <dt><samp class="option">menu_vts <var class="var">int</var></samp></dt>
- <dd><p>The VTS where the menu lives, or 0 if it is a VMG menu (root-level).
- Default is 1, menu of the first VTS.
- </p>
- </dd>
- <dt><samp class="option">pgc <var class="var">int</var></samp></dt>
- <dd><p>The entry PGC to start playback, in conjunction with <samp class="option">pg</samp>.
- Alternative to setting <samp class="option">title</samp>.
- Chapter markers are not supported at this time.
- Must be explicitly set for menus.
- Default is 0, automatically resolve from value of <samp class="option">title</samp>.
- </p>
- </dd>
- <dt><samp class="option">pg <var class="var">int</var></samp></dt>
- <dd><p>The entry PG to start playback, in conjunction with <samp class="option">pgc</samp>.
- Alternative to setting <samp class="option">title</samp>.
- Chapter markers are not supported at this time.
- Default is 1, the first PG of the PGC.
- </p>
- </dd>
- <dt><samp class="option">preindex <var class="var">bool</var></samp></dt>
- <dd><p>Enable this to have accurate chapter (PTT) markers and duration measurement,
- which requires a slow second pass read in order to index the chapter marker
- timestamps from NAV packets. This is non-ideal extra work for real optical drives.
- It is recommended and faster to use this option with a backup of the DVD structure
- stored on a hard drive. Not compatible with <samp class="option">pgc</samp> and <samp class="option">pg</samp>.
- Default is 0, false.
- </p>
- </dd>
- <dt><samp class="option">trim <var class="var">bool</var></samp></dt>
- <dd><p>Skip padding cells (i.e. cells shorter than 1 second) from the beginning.
- There exist many discs with filler segments at the beginning of the PGC,
- often with junk data intended for controlling a real DVD player’s
- buffering speed and with no other material data value.
- Not applicable to menus.
- Default is 1, true.
- </p>
- </dd>
- </dl>
- <a name="Examples-9"></a>
- <h4 class="subsection">20.7.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-9" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-9" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Open title 3 from a given DVD structure:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f dvdvideo -title 3 -i <path to DVD> ...
- </pre></div>
- </li><li>Open chapters 3-6 from title 1 from a given DVD structure:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f dvdvideo -chapter_start 3 -chapter_end 6 -title 1 -i <path to DVD> ...
- </pre></div>
- </li><li>Open only chapter 5 from title 1 from a given DVD structure:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f dvdvideo -chapter_start 5 -chapter_end 5 -title 1 -i <path to DVD> ...
- </pre></div>
- </li><li>Demux menu with language 1 from VTS 1, PGC 1, starting at PG 1:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f dvdvideo -menu 1 -menu_lu 1 -menu_vts 1 -pgc 1 -pg 1 -i <path to DVD> ...
- </pre></div>
- </li></ul>
- <a name="ea"></a>
- <h3 class="section">20.8 ea<span class="pull-right"><a class="anchor hidden-xs" href="#ea" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ea" aria-hidden="true">TOC</a></span></h3>
- <p>Electronic Arts Multimedia format demuxer.
- </p>
- <p>This format is used by various Electronic Arts games.
- </p>
- <a name="Options-60"></a>
- <h4 class="subsection">20.8.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-60" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-60" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">merge_alpha <var class="var">bool</var></samp></dt>
- <dd>
- <p>Normally the VP6 alpha channel (if exists) is returned as a secondary video
- stream, by setting this option you can make the demuxer return a single video
- stream which contains the alpha channel in addition to the ordinary video.
- </p>
- </dd>
- </dl>
- <a name="imf"></a>
- <h3 class="section">20.9 imf<span class="pull-right"><a class="anchor hidden-xs" href="#imf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-imf" aria-hidden="true">TOC</a></span></h3>
- <p>Interoperable Master Format demuxer.
- </p>
- <p>This demuxer presents audio and video streams found in an IMF Composition, as
- specified in <a class="url" href="https://doi.org/10.5594/SMPTE.ST2067-2.2020">SMPTE ST 2067-2</a>.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg [-assetmaps <path of ASSETMAP1>,<path of ASSETMAP2>,...] -i <path of CPL> ...
- </pre></div>
- <p>If <code class="code">-assetmaps</code> is not specified, the demuxer looks for a file called
- <samp class="file">ASSETMAP.xml</samp> in the same directory as the CPL.
- </p>
- <a name="flv_002c-live_005fflv_002c-kux"></a>
- <h3 class="section">20.10 flv, live_flv, kux<span class="pull-right"><a class="anchor hidden-xs" href="#flv_002c-live_005fflv_002c-kux" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flv_002c-live_005fflv_002c-kux" aria-hidden="true">TOC</a></span></h3>
- <p>Adobe Flash Video Format demuxer.
- </p>
- <p>This demuxer is used to demux FLV files and RTMP network streams. In case of live network streams, if you force format, you may use live_flv option instead of flv to survive timestamp discontinuities.
- KUX is a flv variant used on the Youku platform.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f flv -i myfile.flv ...
- ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....
- </pre></div>
- <dl class="table">
- <dt><samp class="option">-flv_metadata <var class="var">bool</var></samp></dt>
- <dd><p>Allocate the streams according to the onMetaData array content.
- </p>
- </dd>
- <dt><samp class="option">-flv_ignore_prevtag <var class="var">bool</var></samp></dt>
- <dd><p>Ignore the size of previous tag value.
- </p>
- </dd>
- <dt><samp class="option">-flv_full_metadata <var class="var">bool</var></samp></dt>
- <dd><p>Output all context of the onMetadata.
- </p></dd>
- </dl>
- <a name="gif-1"></a>
- <h3 class="section">20.11 gif<span class="pull-right"><a class="anchor hidden-xs" href="#gif-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gif-1" aria-hidden="true">TOC</a></span></h3>
- <p>Animated GIF demuxer.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">min_delay</samp></dt>
- <dd><p>Set the minimum valid delay between frames in hundredths of seconds.
- Range is 0 to 6000. Default value is 2.
- </p>
- </dd>
- <dt><samp class="option">max_gif_delay</samp></dt>
- <dd><p>Set the maximum valid delay between frames in hundredth of seconds.
- Range is 0 to 65535. Default value is 65535 (nearly eleven minutes),
- the maximum value allowed by the specification.
- </p>
- </dd>
- <dt><samp class="option">default_delay</samp></dt>
- <dd><p>Set the default delay between frames in hundredths of seconds.
- Range is 0 to 6000. Default value is 10.
- </p>
- </dd>
- <dt><samp class="option">ignore_loop</samp></dt>
- <dd><p>GIF files can contain information to loop a certain number of times (or
- infinitely). If <samp class="option">ignore_loop</samp> is set to 1, then the loop setting
- from the input will be ignored and looping will not occur. If set to 0,
- then looping will occur and will cycle the number of times according to
- the GIF. Default value is 1.
- </p></dd>
- </dl>
- <p>For example, with the overlay filter, place an infinitely looping GIF
- over another video:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
- </pre></div>
- <p>Note that in the above example the shortest option for overlay filter is
- used to end the output video at the length of the shortest input file,
- which in this case is <samp class="file">input.mp4</samp> as the GIF in this example loops
- infinitely.
- </p>
- <a name="hls-1"></a>
- <h3 class="section">20.12 hls<span class="pull-right"><a class="anchor hidden-xs" href="#hls-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hls-1" aria-hidden="true">TOC</a></span></h3>
- <p>HLS demuxer
- </p>
- <p>Apple HTTP Live Streaming demuxer.
- </p>
- <p>This demuxer presents all AVStreams from all variant streams.
- The id field is set to the bitrate variant index number. By setting
- the discard flags on AVStreams (by pressing ’a’ or ’v’ in ffplay),
- the caller can decide which variant streams to actually receive.
- The total bitrate of the variant that the stream belongs to is
- available in a metadata key named "variant_bitrate".
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">live_start_index</samp></dt>
- <dd><p>segment index to start live streams at (negative values are from the end).
- </p>
- </dd>
- <dt><samp class="option">prefer_x_start</samp></dt>
- <dd><p>prefer to use #EXT-X-START if it’s in playlist instead of live_start_index.
- </p>
- </dd>
- <dt><samp class="option">allowed_extensions</samp></dt>
- <dd><p>’,’ separated list of file extensions that hls is allowed to access.
- </p>
- </dd>
- <dt><samp class="option">extension_picky</samp></dt>
- <dd><p>This blocks disallowed extensions from probing
- It also requires all available segments to have matching extensions to the format
- except mpegts, which is always allowed.
- It is recommended to set the whitelists correctly instead of depending on extensions
- Enabled by default.
- </p>
- </dd>
- <dt><samp class="option">max_reload</samp></dt>
- <dd><p>Maximum number of times a insufficient list is attempted to be reloaded.
- Default value is 1000.
- </p>
- </dd>
- <dt><samp class="option">m3u8_hold_counters</samp></dt>
- <dd><p>The maximum number of times to load m3u8 when it refreshes without new segments.
- Default value is 1000.
- </p>
- </dd>
- <dt><samp class="option">http_persistent</samp></dt>
- <dd><p>Use persistent HTTP connections. Applicable only for HTTP streams.
- Enabled by default.
- </p>
- </dd>
- <dt><samp class="option">http_multiple</samp></dt>
- <dd><p>Use multiple HTTP connections for downloading HTTP segments.
- Enabled by default for HTTP/1.1 servers.
- </p>
- </dd>
- <dt><samp class="option">http_seekable</samp></dt>
- <dd><p>Use HTTP partial requests for downloading HTTP segments.
- 0 = disable, 1 = enable, -1 = auto, Default is auto.
- </p>
- </dd>
- <dt><samp class="option">seg_format_options</samp></dt>
- <dd><p>Set options for the demuxer of media segments using a list of key=value pairs separated by <code class="code">:</code>.
- </p>
- </dd>
- <dt><samp class="option">seg_max_retry</samp></dt>
- <dd><p>Maximum number of times to reload a segment on error, useful when segment skip on network error is not desired.
- Default value is 0.
- </p></dd>
- </dl>
- <a name="image2-1"></a>
- <h3 class="section">20.13 image2<span class="pull-right"><a class="anchor hidden-xs" href="#image2-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-image2-1" aria-hidden="true">TOC</a></span></h3>
- <p>Image file demuxer.
- </p>
- <p>This demuxer reads from a list of image files specified by a pattern.
- The syntax and meaning of the pattern is specified by the
- option <var class="var">pattern_type</var>.
- </p>
- <p>The pattern may contain a suffix which is used to automatically
- determine the format of the images contained in the files.
- </p>
- <p>The size, the pixel format, and the format of each image must be the
- same for all the files in the sequence.
- </p>
- <p>This demuxer accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the frame rate for the video stream. It defaults to 25.
- </p></dd>
- <dt><samp class="option">loop</samp></dt>
- <dd><p>If set to 1, loop over the input. Default value is 0.
- </p></dd>
- <dt><samp class="option">pattern_type</samp></dt>
- <dd><p>Select the pattern type used to interpret the provided filename.
- </p>
- <p><var class="var">pattern_type</var> accepts one of the following values.
- </p><dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>Disable pattern matching, therefore the video will only contain the specified
- image. You should use this option if you do not want to create sequences from
- multiple images and your filenames may contain special pattern characters.
- </p></dd>
- <dt><samp class="option">sequence</samp></dt>
- <dd><p>Select a sequence pattern type, used to specify a sequence of files
- indexed by sequential numbers.
- </p>
- <p>A sequence pattern may contain the string "%d" or "%0<var class="var">N</var>d", which
- specifies the position of the characters representing a sequential
- number in each filename matched by the pattern. If the form
- "%d0<var class="var">N</var>d" is used, the string representing the number in each
- filename is 0-padded and <var class="var">N</var> is the total number of 0-padded
- digits representing the number. The literal character ’%’ can be
- specified in the pattern with the string "%%".
- </p>
- <p>If the sequence pattern contains "%d" or "%0<var class="var">N</var>d", the first filename of
- the file list specified by the pattern must contain a number
- inclusively contained between <var class="var">start_number</var> and
- <var class="var">start_number</var>+<var class="var">start_number_range</var>-1, and all the following
- numbers must be sequential.
- </p>
- <p>For example the pattern "img-%03d.bmp" will match a sequence of
- filenames of the form <samp class="file">img-001.bmp</samp>, <samp class="file">img-002.bmp</samp>, ...,
- <samp class="file">img-010.bmp</samp>, etc.; the pattern "i%%m%%g-%d.jpg" will match a
- sequence of filenames of the form <samp class="file">i%m%g-1.jpg</samp>,
- <samp class="file">i%m%g-2.jpg</samp>, ..., <samp class="file">i%m%g-10.jpg</samp>, etc.
- </p>
- <p>Note that the pattern must not necessarily contain "%d" or
- "%0<var class="var">N</var>d", for example to convert a single image file
- <samp class="file">img.jpeg</samp> you can employ the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i img.jpeg img.png
- </pre></div>
- </dd>
- <dt><samp class="option">glob</samp></dt>
- <dd><p>Select a glob wildcard pattern type.
- </p>
- <p>The pattern is interpreted like a <code class="code">glob()</code> pattern. This is only
- selectable if libavformat was compiled with globbing support.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">sequence</var>.
- </p></dd>
- <dt><samp class="option">pixel_format</samp></dt>
- <dd><p>Set the pixel format of the images to read. If not specified the pixel
- format is guessed from the first image file in the sequence.
- </p></dd>
- <dt><samp class="option">start_number</samp></dt>
- <dd><p>Set the index of the file matched by the image file pattern to start
- to read from. Default value is 0.
- </p></dd>
- <dt><samp class="option">start_number_range</samp></dt>
- <dd><p>Set the index interval range to check when looking for the first image
- file in the sequence, starting from <var class="var">start_number</var>. Default value
- is 5.
- </p></dd>
- <dt><samp class="option">ts_from_file</samp></dt>
- <dd><p>If set to 1, will set frame timestamp to modification time of image file. Note
- that monotonity of timestamps is not provided: images go in the same order as
- without this option. Default value is 0.
- If set to 2, will set frame timestamp to the modification time of the image file in
- nanosecond precision.
- </p></dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video size of the images to read. If not specified the video
- size is guessed from the first image file in the sequence.
- </p></dd>
- <dt><samp class="option">export_path_metadata</samp></dt>
- <dd><p>If set to 1, will add two extra fields to the metadata found in input, making them
- also available for other filters (see <var class="var">drawtext</var> filter for examples). Default
- value is 0. The extra fields are described below:
- </p><dl class="table">
- <dt><samp class="option">lavf.image2dec.source_path</samp></dt>
- <dd><p>Corresponds to the full path to the input file being read.
- </p></dd>
- <dt><samp class="option">lavf.image2dec.source_basename</samp></dt>
- <dd><p>Corresponds to the name of the file being read.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-10"></a>
- <h4 class="subsection">20.13.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-10" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-10" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> for creating a video from the images in the file
- sequence <samp class="file">img-001.jpeg</samp>, <samp class="file">img-002.jpeg</samp>, ..., assuming an
- input frame rate of 10 frames per second:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
- </pre></div>
- </li><li>As above, but start by reading from a file with index 100 in the sequence:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
- </pre></div>
- </li><li>Read images matching the "*.png" glob pattern , that is all the files
- terminating with the ".png" suffix:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
- </pre></div>
- </li></ul>
- <a name="libgme"></a>
- <h3 class="section">20.14 libgme<span class="pull-right"><a class="anchor hidden-xs" href="#libgme" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libgme" aria-hidden="true">TOC</a></span></h3>
- <p>The Game Music Emu library is a collection of video game music file emulators.
- </p>
- <p>See <a class="url" href="https://bitbucket.org/mpyne/game-music-emu/overview">https://bitbucket.org/mpyne/game-music-emu/overview</a> for more information.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">track_index</samp></dt>
- <dd><p>Set the index of which track to demux. The demuxer can only export one track.
- Track indexes start at 0. Default is to pick the first track. Number of tracks
- is exported as <var class="var">tracks</var> metadata entry.
- </p>
- </dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sampling rate of the exported track. Range is 1000 to 999999. Default is 44100.
- </p>
- </dd>
- <dt><samp class="option">max_size <em class="emph">(bytes)</em></samp></dt>
- <dd><p>The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size,
- which in turn, acts as a ceiling for the size of files that can be read.
- Default is 50 MiB.
- </p>
- </dd>
- </dl>
- <a name="libmodplug"></a>
- <h3 class="section">20.15 libmodplug<span class="pull-right"><a class="anchor hidden-xs" href="#libmodplug" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libmodplug" aria-hidden="true">TOC</a></span></h3>
- <p>ModPlug based module demuxer
- </p>
- <p>See <a class="url" href="https://github.com/Konstanty/libmodplug">https://github.com/Konstanty/libmodplug</a>
- </p>
- <p>It will export one 2-channel 16-bit 44.1 kHz audio stream.
- Optionally, a <code class="code">pal8</code> 16-color video stream can be exported with or without printed metadata.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">noise_reduction</samp></dt>
- <dd><p>Apply a simple low-pass filter. Can be 1 (on) or 0 (off). Default is 0.
- </p>
- </dd>
- <dt><samp class="option">reverb_depth</samp></dt>
- <dd><p>Set amount of reverb. Range 0-100. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">reverb_delay</samp></dt>
- <dd><p>Set delay in ms, clamped to 40-250 ms. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">bass_amount</samp></dt>
- <dd><p>Apply bass expansion a.k.a. XBass or megabass. Range is 0 (quiet) to 100 (loud). Default is 0.
- </p>
- </dd>
- <dt><samp class="option">bass_range</samp></dt>
- <dd><p>Set cutoff i.e. upper-bound for bass frequencies. Range is 10-100 Hz. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">surround_depth</samp></dt>
- <dd><p>Apply a Dolby Pro-Logic surround effect. Range is 0 (quiet) to 100 (heavy). Default is 0.
- </p>
- </dd>
- <dt><samp class="option">surround_delay</samp></dt>
- <dd><p>Set surround delay in ms, clamped to 5-40 ms. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">max_size</samp></dt>
- <dd><p>The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size,
- which in turn, acts as a ceiling for the size of files that can be read. Range is 0 to 100 MiB.
- 0 removes buffer size limit (not recommended). Default is 5 MiB.
- </p>
- </dd>
- <dt><samp class="option">video_stream_expr</samp></dt>
- <dd><p>String which is evaluated using the eval API to assign colors to the generated video stream.
- Variables which can be used are <code class="code">x</code>, <code class="code">y</code>, <code class="code">w</code>, <code class="code">h</code>, <code class="code">t</code>, <code class="code">speed</code>,
- <code class="code">tempo</code>, <code class="code">order</code>, <code class="code">pattern</code> and <code class="code">row</code>.
- </p>
- </dd>
- <dt><samp class="option">video_stream</samp></dt>
- <dd><p>Generate video stream. Can be 1 (on) or 0 (off). Default is 0.
- </p>
- </dd>
- <dt><samp class="option">video_stream_w</samp></dt>
- <dd><p>Set video frame width in ’chars’ where one char indicates 8 pixels. Range is 20-512. Default is 30.
- </p>
- </dd>
- <dt><samp class="option">video_stream_h</samp></dt>
- <dd><p>Set video frame height in ’chars’ where one char indicates 8 pixels. Range is 20-512. Default is 30.
- </p>
- </dd>
- <dt><samp class="option">video_stream_ptxt</samp></dt>
- <dd><p>Print metadata on video stream. Includes <code class="code">speed</code>, <code class="code">tempo</code>, <code class="code">order</code>, <code class="code">pattern</code>,
- <code class="code">row</code> and <code class="code">ts</code> (time in ms). Can be 1 (on) or 0 (off). Default is 1.
- </p>
- </dd>
- </dl>
- <a name="libopenmpt"></a>
- <h3 class="section">20.16 libopenmpt<span class="pull-right"><a class="anchor hidden-xs" href="#libopenmpt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libopenmpt" aria-hidden="true">TOC</a></span></h3>
- <p>libopenmpt based module demuxer
- </p>
- <p>See <a class="url" href="https://lib.openmpt.org/libopenmpt/">https://lib.openmpt.org/libopenmpt/</a> for more information.
- </p>
- <p>Some files have multiple subsongs (tracks) this can be set with the <samp class="option">subsong</samp>
- option.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">subsong</samp></dt>
- <dd><p>Set the subsong index. This can be either ’all’, ’auto’, or the index of the
- subsong. Subsong indexes start at 0. The default is ’auto’.
- </p>
- <p>The default value is to let libopenmpt choose.
- </p>
- </dd>
- <dt><samp class="option">layout</samp></dt>
- <dd><p>Set the channel layout. Valid values are 1, 2, and 4 channel layouts.
- The default value is STEREO.
- </p>
- </dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sample rate for libopenmpt to output.
- Range is from 1000 to INT_MAX. The value default is 48000.
- </p></dd>
- </dl>
- <a class="anchor" id="mccdec"></a><a name="mcc"></a>
- <h3 class="section">20.17 mcc<span class="pull-right"><a class="anchor hidden-xs" href="#mcc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mcc" aria-hidden="true">TOC</a></span></h3>
- <p>Demuxer for MacCaption MCC files, it supports MCC versions 1.0 and 2.0.
- MCC files store VANC data, which can include closed captions (EIA-608 and CEA-708), ancillary time code, pan-scan data, etc.
- By default, for backward compatibility, the MCC demuxer extracts just the EIA-608 and CEA-708 closed captions and returns a <code class="code">EIA_608</code> stream, ignoring all other VANC data.
- You can change it to return all VANC data in a <code class="code">SMPTE_436M_ANC</code> data stream by setting <samp class="option">-eia608_extract 0</samp>
- </p>
- <a name="Examples-11"></a>
- <h4 class="subsection">20.17.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-11" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-11" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert a MCC file to Scenarist (SCC) format:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i CC.mcc -c:s copy CC.scc
- </pre></div>
- <p>Note that the SCC format only supports EIA-608, so this will discard all other data such as CEA-708 extensions.
- </p>
- </li><li>Merge a MCC file into a MXF file:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i video_and_audio.mxf -eia608_extract 0 -i CC.mcc -c copy -map 0 -map 1 out.mxf
- </pre></div>
- <p>This retains all VANC data and inserts it into the output MXF file as a <code class="code">SMPTE_436M_ANC</code> data stream.
- </p></li></ul>
- <a name="mov_002fmp4_002f3gp"></a>
- <h3 class="section">20.18 mov/mp4/3gp<span class="pull-right"><a class="anchor hidden-xs" href="#mov_002fmp4_002f3gp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mov_002fmp4_002f3gp" aria-hidden="true">TOC</a></span></h3>
- <p>Demuxer for Quicktime File Format & ISO/IEC Base Media File Format (ISO/IEC 14496-12 or MPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part 12).
- </p>
- <p>Registered extensions: mov, mp4, m4a, 3gp, 3g2, mj2, psp, m4b, ism, ismv, isma, f4v
- </p>
- <a name="Options-61"></a>
- <h4 class="subsection">20.18.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-61" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-61" aria-hidden="true">TOC</a></span></h4>
- <p>This demuxer accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">enable_drefs</samp></dt>
- <dd><p>Enable loading of external tracks, disabled by default.
- Enabling this can theoretically leak information in some use cases.
- </p>
- </dd>
- <dt><samp class="option">use_absolute_path</samp></dt>
- <dd><p>Allows loading of external tracks via absolute paths, disabled by default.
- Enabling this poses a security risk. It should only be enabled if the source
- is known to be non-malicious.
- </p>
- </dd>
- <dt><samp class="option">seek_streams_individually</samp></dt>
- <dd><p>When seeking, identify the closest point in each stream individually and demux packets in
- that stream from identified point. This can lead to a different sequence of packets compared
- to demuxing linearly from the beginning. Default is true.
- </p>
- </dd>
- <dt><samp class="option">ignore_editlist</samp></dt>
- <dd><p>Ignore any edit list atoms. The demuxer, by default, modifies the stream index to reflect the
- timeline described by the edit list. Default is false.
- </p>
- </dd>
- <dt><samp class="option">advanced_editlist</samp></dt>
- <dd><p>Modify the stream index to reflect the timeline described by the edit list. <code class="code">ignore_editlist</code>
- must be set to false for this option to be effective.
- If both <code class="code">ignore_editlist</code> and this option are set to false, then only the
- start of the stream index is modified to reflect initial dwell time or starting timestamp
- described by the edit list. Default is true.
- </p>
- </dd>
- <dt><samp class="option">ignore_chapters</samp></dt>
- <dd><p>Don’t parse chapters. This includes GoPro ’HiLight’ tags/moments. Note that chapters are
- only parsed when input is seekable. Default is false.
- </p>
- </dd>
- <dt><samp class="option">use_mfra_for</samp></dt>
- <dd><p>For seekable fragmented input, set fragment’s starting timestamp from media fragment random access box, if present.
- </p>
- <p>Following options are available:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Auto-detect whether to set mfra timestamps as PTS or DTS <em class="emph">(default)</em>
- </p>
- </dd>
- <dt>‘<samp class="samp">dts</samp>’</dt>
- <dd><p>Set mfra timestamps as DTS
- </p>
- </dd>
- <dt>‘<samp class="samp">pts</samp>’</dt>
- <dd><p>Set mfra timestamps as PTS
- </p>
- </dd>
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>Don’t use mfra box to set timestamps
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">use_tfdt</samp></dt>
- <dd><p>For fragmented input, set fragment’s starting timestamp to <code class="code">baseMediaDecodeTime</code> from the <code class="code">tfdt</code> box.
- Default is enabled, which will prefer to use the <code class="code">tfdt</code> box to set DTS. Disable to use the <code class="code">earliest_presentation_time</code> from the <code class="code">sidx</code> box.
- In either case, the timestamp from the <code class="code">mfra</code> box will be used if it’s available and <code class="code">use_mfra_for</code> is
- set to pts or dts.
- </p>
- </dd>
- <dt><samp class="option">export_all</samp></dt>
- <dd><p>Export unrecognized boxes within the <var class="var">udta</var> box as metadata entries. The first four
- characters of the box type are set as the key. Default is false.
- </p>
- </dd>
- <dt><samp class="option">export_xmp</samp></dt>
- <dd><p>Export entire contents of <var class="var">XMP_</var> box and <var class="var">uuid</var> box as a string with key <code class="code">xmp</code>. Note that
- if <code class="code">export_all</code> is set and this option isn’t, the contents of <var class="var">XMP_</var> box are still exported
- but with key <code class="code">XMP_</code>. Default is false.
- </p>
- </dd>
- <dt><samp class="option">activation_bytes</samp></dt>
- <dd><p>4-byte key required to decrypt Audible AAX and AAX+ files. See Audible AAX subsection below.
- </p>
- </dd>
- <dt><samp class="option">audible_fixed_key</samp></dt>
- <dd><p>Fixed key used for handling Audible AAX/AAX+ files. It has been pre-set so should not be necessary to
- specify.
- </p>
- </dd>
- <dt><samp class="option">decryption_key</samp></dt>
- <dd><p>16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
- </p>
- </dd>
- <dt><samp class="option">max_stts_delta</samp></dt>
- <dd><p>Very high sample deltas written in a trak’s stts box may occasionally be intended but usually they are written in
- error or used to store a negative value for dts correction when treated as signed 32-bit integers. This option lets
- the user set an upper limit, beyond which the delta is clamped to 1. Values greater than the limit if negative when
- cast to int32 are used to adjust onward dts.
- </p>
- <p>Unit is the track time scale. Range is 0 to UINT_MAX. Default is <code class="code">UINT_MAX - 48000*10</code> which allows up to
- a 10 second dts correction for 48 kHz audio streams while accommodating 99.9% of <code class="code">uint32</code> range.
- </p>
- </dd>
- <dt><samp class="option">interleaved_read</samp></dt>
- <dd><p>Interleave packets from multiple tracks at demuxer level. For badly interleaved files, this prevents playback issues
- caused by large gaps between packets in different tracks, as MOV/MP4 do not have packet placement requirements.
- However, this can cause excessive seeking on very badly interleaved files, due to seeking between tracks, so disabling
- it may prevent I/O issues, at the expense of playback.
- </p>
- </dd>
- </dl>
- <a name="Audible-AAX"></a>
- <h4 class="subsection">20.18.2 Audible AAX<span class="pull-right"><a class="anchor hidden-xs" href="#Audible-AAX" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audible-AAX" aria-hidden="true">TOC</a></span></h4>
- <p>Audible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte activation secret.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
- </pre></div>
- <a name="mpegts"></a>
- <h3 class="section">20.19 mpegts<span class="pull-right"><a class="anchor hidden-xs" href="#mpegts" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpegts" aria-hidden="true">TOC</a></span></h3>
- <p>MPEG-2 transport stream demuxer.
- </p>
- <p>This demuxer accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">resync_size</samp></dt>
- <dd><p>Set size limit for looking up a new synchronization. Default value is
- 65536.
- </p>
- </dd>
- <dt><samp class="option">skip_unknown_pmt</samp></dt>
- <dd><p>Skip PMTs for programs not defined in the PAT. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">fix_teletext_pts</samp></dt>
- <dd><p>Override teletext packet PTS and DTS values with the timestamps calculated
- from the PCR of the first program which the teletext stream is part of and is
- not discarded. Default value is 1, set this option to 0 if you want your
- teletext packet PTS and DTS values untouched.
- </p>
- </dd>
- <dt><samp class="option">ts_packetsize</samp></dt>
- <dd><p>Output option carrying the raw packet size in bytes.
- Show the detected raw packet size, cannot be set by the user.
- </p>
- </dd>
- <dt><samp class="option">scan_all_pmts</samp></dt>
- <dd><p>Scan and combine all PMTs. The value is an integer with value from -1
- to 1 (-1 means automatic setting, 1 means enabled, 0 means
- disabled). Default value is -1.
- </p>
- </dd>
- <dt><samp class="option">merge_pmt_versions</samp></dt>
- <dd><p>Reuse existing streams when a PMT’s version is updated and elementary
- streams move to different PIDs. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">max_packet_size</samp></dt>
- <dd><p>Set maximum size, in bytes, of packet emitted by the demuxer. Payloads above this size
- are split across multiple packets. Range is 1 to INT_MAX/2. Default is 204800 bytes.
- </p></dd>
- </dl>
- <a name="mpjpeg"></a>
- <h3 class="section">20.20 mpjpeg<span class="pull-right"><a class="anchor hidden-xs" href="#mpjpeg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpjpeg" aria-hidden="true">TOC</a></span></h3>
- <p>MJPEG encapsulated in multi-part MIME demuxer.
- </p>
- <p>This demuxer allows reading of MJPEG, where each frame is represented as a part of
- multipart/x-mixed-replace stream.
- </p><dl class="table">
- <dt><samp class="option">strict_mime_boundary</samp></dt>
- <dd><p>Default implementation applies a relaxed standard to multi-part MIME boundary detection,
- to prevent regression with numerous existing endpoints not generating a proper MIME
- MJPEG stream. Turning this option on by setting it to 1 will result in a stricter check
- of the boundary value.
- </p></dd>
- </dl>
- <a name="rawvideo-1"></a>
- <h3 class="section">20.21 rawvideo<span class="pull-right"><a class="anchor hidden-xs" href="#rawvideo-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rawvideo-1" aria-hidden="true">TOC</a></span></h3>
- <p>Raw video demuxer.
- </p>
- <p>This demuxer allows one to read raw video data. Since there is no header
- specifying the assumed video parameters, the user must specify them
- in order to be able to decode the data correctly.
- </p>
- <p>This demuxer accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set input video frame rate. Default value is 25.
- </p>
- </dd>
- <dt><samp class="option">pixel_format</samp></dt>
- <dd><p>Set the input video pixel format. Default value is <code class="code">yuv420p</code>.
- </p>
- </dd>
- <dt><samp class="option">stride</samp></dt>
- <dd><p>Set frame line size in bytes, only required if there are extra padding.
- For multiplane formats, <samp class="option">stride</samp> is a list of line size for each
- plane.
- </p>
- </dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the input video size. This value must be specified explicitly.
- </p></dd>
- </dl>
- <p>For example to read a rawvideo file <samp class="file">input.raw</samp> with
- <code class="command">ffplay</code>, assuming a pixel format of <code class="code">rgb24</code>, a video
- size of <code class="code">320x240</code>, and a frame rate of 10 images per second, use
- the command:
- </p><div class="example">
- <pre class="example-preformatted">ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
- </pre></div>
- <p>Read a rawvideo with <code class="command">ffplay</code>, assuming a pixel format of <code class="code">yuv420p</code>,
- a video size of <code class="code">1080x1920</code>, has 8 bytes of padding in each line of Y plane,
- and 4 bytes of padding with UV plane,
- </p><div class="example">
- <pre class="example-preformatted">ffplay -f rawvideo -pixel_format yuv420p -video_size 1080x1920 -stride 1088,544,544 input.raw
- </pre></div>
- <a class="anchor" id="rcwtdec"></a><a name="rcwt"></a>
- <h3 class="section">20.22 rcwt<span class="pull-right"><a class="anchor hidden-xs" href="#rcwt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rcwt" aria-hidden="true">TOC</a></span></h3>
- <p>RCWT (Raw Captions With Time) is a format native to ccextractor, a commonly
- used open source tool for processing 608/708 Closed Captions (CC) sources.
- For more information on the format, see <a data-manual="ffmpeg-formats" href="ffmpeg-formats.html#rcwtenc">(ffmpeg-formats)rcwtenc</a>.
- </p>
- <p>This demuxer implements the specification as of March 2024, which has
- been stable and unchanged since April 2014.
- </p>
- <a name="Examples-12"></a>
- <h4 class="subsection">20.22.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-12" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-12" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Render CC to ASS using the built-in decoder:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i CC.rcwt.bin CC.ass
- </pre></div>
- <p>Note that if your output appears to be empty, you may have to manually
- set the decoder’s <samp class="option">data_field</samp> option to pick the desired CC substream.
- </p>
- </li><li>Convert an RCWT backup to Scenarist (SCC) format:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i CC.rcwt.bin -c:s copy CC.scc
- </pre></div>
- <p>Note that the SCC format does not support all of the possible CC extensions
- that can be stored in RCWT (such as EIA-708).
- </p></li></ul>
- <a name="sbg"></a>
- <h3 class="section">20.23 sbg<span class="pull-right"><a class="anchor hidden-xs" href="#sbg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sbg" aria-hidden="true">TOC</a></span></h3>
- <p>SBaGen script demuxer.
- </p>
- <p>This demuxer reads the script language used by SBaGen
- <a class="url" href="http://uazu.net/sbagen/">http://uazu.net/sbagen/</a> to generate binaural beats sessions. A SBG
- script looks like that:
- </p><div class="example">
- <pre class="example-preformatted">-SE
- a: 300-2.5/3 440+4.5/0
- b: 300-2.5/0 440+4.5/3
- off: -
- NOW == a
- +0:07:00 == b
- +0:14:00 == a
- +0:21:00 == b
- +0:30:00 off
- </pre></div>
- <p>A SBG script can mix absolute and relative timestamps. If the script uses
- either only absolute timestamps (including the script start time) or only
- relative ones, then its layout is fixed, and the conversion is
- straightforward. On the other hand, if the script mixes both kind of
- timestamps, then the <var class="var">NOW</var> reference for relative timestamps will be
- taken from the current time of day at the time the script is read, and the
- script layout will be frozen according to that reference. That means that if
- the script is directly played, the actual times will match the absolute
- timestamps up to the sound controller’s clock accuracy, but if the user
- somehow pauses the playback or seeks, all times will be shifted accordingly.
- </p>
- <a name="tedcaptions"></a>
- <h3 class="section">20.24 tedcaptions<span class="pull-right"><a class="anchor hidden-xs" href="#tedcaptions" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tedcaptions" aria-hidden="true">TOC</a></span></h3>
- <p>JSON captions used for <a class="url" href="http://www.ted.com/">TED Talks</a>.
- </p>
- <p>TED does not provide links to the captions, but they can be guessed from the
- page. The file <samp class="file">tools/bookmarklets.html</samp> from the FFmpeg source tree
- contains a bookmarklet to expose them.
- </p>
- <p>This demuxer accepts the following option:
- </p><dl class="table">
- <dt><samp class="option">start_time</samp></dt>
- <dd><p>Set the start time of the TED talk, in milliseconds. The default is 15000
- (15s). It is used to sync the captions with the downloadable videos, because
- they include a 15s intro.
- </p></dd>
- </dl>
- <p>Example: convert the captions to a format most players understand:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt
- </pre></div>
- <a name="vapoursynth"></a>
- <h3 class="section">20.25 vapoursynth<span class="pull-right"><a class="anchor hidden-xs" href="#vapoursynth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vapoursynth" aria-hidden="true">TOC</a></span></h3>
- <p>Vapoursynth wrapper.
- </p>
- <p>Due to security concerns, Vapoursynth scripts will not
- be autodetected so the input format has to be forced. For ff* CLI tools,
- add <code class="code">-f vapoursynth</code> before the input <code class="code">-i yourscript.vpy</code>.
- </p>
- <p>This demuxer accepts the following option:
- </p><dl class="table">
- <dt><samp class="option">max_script_size</samp></dt>
- <dd><p>The demuxer buffers the entire script into memory. Adjust this value to set the maximum buffer size,
- which in turn, acts as a ceiling for the size of scripts that can be read.
- Default is 1 MiB.
- </p></dd>
- </dl>
- <a name="w64"></a>
- <h3 class="section">20.26 w64<span class="pull-right"><a class="anchor hidden-xs" href="#w64" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-w64" aria-hidden="true">TOC</a></span></h3>
- <p>Sony Wave64 Audio demuxer.
- </p>
- <p>This demuxer accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">max_size</samp></dt>
- <dd><p>See the same option for the <a class="ref" href="#wav">wav</a> demuxer.
- </p></dd>
- </dl>
- <a class="anchor" id="wav"></a><a name="wav-1"></a>
- <h3 class="section">20.27 wav<span class="pull-right"><a class="anchor hidden-xs" href="#wav-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-wav-1" aria-hidden="true">TOC</a></span></h3>
- <p>RIFF Wave Audio demuxer.
- </p>
- <p>This demuxer accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">max_size</samp></dt>
- <dd><p>Specify the maximum packet size in bytes for the demuxed packets. By default
- this is set to 0, which means that a sensible value is chosen based on the
- input format.
- </p></dd>
- </dl>
- <a name="Muxers"></a>
- <h2 class="chapter">21 Muxers<span class="pull-right"><a class="anchor hidden-xs" href="#Muxers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Muxers" aria-hidden="true">TOC</a></span></h2>
- <p>Muxers are configured elements in FFmpeg which allow writing
- multimedia streams to a particular type of file.
- </p>
- <p>When you configure your FFmpeg build, all the supported muxers
- are enabled by default. You can list all available muxers using the
- configure option <code class="code">--list-muxers</code>.
- </p>
- <p>You can disable all the muxers with the configure option
- <code class="code">--disable-muxers</code> and selectively enable / disable single muxers
- with the options <code class="code">--enable-muxer=<var class="var">MUXER</var></code> /
- <code class="code">--disable-muxer=<var class="var">MUXER</var></code>.
- </p>
- <p>The option <code class="code">-muxers</code> of the ff* tools will display the list of
- enabled muxers. Use <code class="code">-formats</code> to view a combined list of
- enabled demuxers and muxers.
- </p>
- <p>A description of some of the currently available muxers follows.
- </p>
- <a class="anchor" id="raw-muxers"></a><a name="Raw-muxers"></a>
- <h3 class="section">21.1 Raw muxers<span class="pull-right"><a class="anchor hidden-xs" href="#Raw-muxers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Raw-muxers" aria-hidden="true">TOC</a></span></h3>
- <p>This section covers raw muxers. They accept a single stream matching
- the designated codec. They do not store timestamps or metadata. The
- recognized extension is the same as the muxer name unless indicated
- otherwise.
- </p>
- <p>It comprises the following muxers. The media type and the eventual
- extensions used to automatically selects the muxer from the output
- extensions are also shown.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">ac3 <em class="emph">audio</em></samp>’</dt>
- <dd><p>Dolby Digital, also known as AC-3.
- </p>
- </dd>
- <dt>‘<samp class="samp">adx <em class="emph">audio</em></samp>’</dt>
- <dd><p>CRI Middleware ADX audio.
- </p>
- <p>This muxer will write out the total sample count near the start of the
- first packet when the output is seekable and the count can be stored
- in 32 bits.
- </p>
- </dd>
- <dt>‘<samp class="samp">aptx <em class="emph">audio</em></samp>’</dt>
- <dd><p>aptX (Audio Processing Technology for Bluetooth)
- </p>
- </dd>
- <dt>‘<samp class="samp">aptx_hd <em class="emph">audio</em> (aptxdh)</samp>’</dt>
- <dd><p>aptX HD (Audio Processing Technology for Bluetooth) audio
- </p>
- </dd>
- <dt>‘<samp class="samp">avs2 <em class="emph">video</em> (avs, avs2)</samp>’</dt>
- <dd><p>AVS2-P2 (Audio Video Standard - Second generation - Part 2) /
- IEEE 1857.4 video
- </p>
- </dd>
- <dt>‘<samp class="samp">avs3 <em class="emph">video</em> (avs3)</samp>’</dt>
- <dd><p>AVS3-P2 (Audio Video Standard - Third generation - Part 2) /
- IEEE 1857.10 video
- </p>
- </dd>
- <dt>‘<samp class="samp">cavsvideo <em class="emph">video</em> (cavs)</samp>’</dt>
- <dd><p>Chinese AVS (Audio Video Standard - First generation)
- </p>
- </dd>
- <dt>‘<samp class="samp">codec2raw <em class="emph">audio</em></samp>’</dt>
- <dd><p>Codec 2 audio.
- </p>
- <p>No extension is registered so format name has to be supplied e.g. with
- the ffmpeg CLI tool <code class="code">-f codec2raw</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">data <em class="emph">any</em></samp>’</dt>
- <dd><p>Generic data muxer.
- </p>
- <p>This muxer accepts a single stream with any codec of any type. The
- input stream has to be selected using the <code class="code">-map</code> option with the
- <code class="command">ffmpeg</code> CLI tool.
- </p>
- <p>No extension is registered so format name has to be supplied e.g. with
- the <code class="command">ffmpeg</code> CLI tool <code class="code">-f data</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">dfpwm <em class="emph">audio</em> (dfpwm)</samp>’</dt>
- <dd><p>Raw DFPWM1a (Dynamic Filter Pulse With Modulation) audio muxer.
- </p>
- </dd>
- <dt>‘<samp class="samp">dirac <em class="emph">video</em> (drc, vc2)</samp>’</dt>
- <dd><p>BBC Dirac video.
- </p>
- <p>The Dirac Pro codec is a subset and is standardized as SMPTE VC-2.
- </p>
- </dd>
- <dt>‘<samp class="samp">dnxhd <em class="emph">video</em> (dnxhd, dnxhr)</samp>’</dt>
- <dd><p>Avid DNxHD video.
- </p>
- <p>It is standardized as SMPTE VC-3. Accepts DNxHR streams.
- </p>
- </dd>
- <dt>‘<samp class="samp">dts <em class="emph">audio</em></samp>’</dt>
- <dd><p>DTS Coherent Acoustics (DCA) audio
- </p>
- </dd>
- <dt>‘<samp class="samp">eac3 <em class="emph">audio</em></samp>’</dt>
- <dd><p>Dolby Digital Plus, also known as Enhanced AC-3
- </p>
- </dd>
- <dt>‘<samp class="samp">evc <em class="emph">video</em> (evc)</samp>’</dt>
- <dd><p>MPEG-5 Essential Video Coding (EVC) / EVC / MPEG-5 Part 1 EVC video
- </p>
- </dd>
- <dt>‘<samp class="samp">g722 <em class="emph">audio</em></samp>’</dt>
- <dd><p>ITU-T G.722 audio
- </p>
- </dd>
- <dt>‘<samp class="samp">g723_1 <em class="emph">audio</em> (tco, rco)</samp>’</dt>
- <dd><p>ITU-T G.723.1 audio
- </p>
- </dd>
- <dt>‘<samp class="samp">g726 <em class="emph">audio</em></samp>’</dt>
- <dd><p>ITU-T G.726 big-endian ("left-justified") audio.
- </p>
- <p>No extension is registered so format name has to be supplied e.g. with
- the <code class="command">ffmpeg</code> CLI tool <code class="code">-f g726</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">g726le <em class="emph">audio</em></samp>’</dt>
- <dd><p>ITU-T G.726 little-endian ("right-justified") audio.
- </p>
- <p>No extension is registered so format name has to be supplied e.g. with
- the <code class="command">ffmpeg</code> CLI tool <code class="code">-f g726le</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">gsm <em class="emph">audio</em></samp>’</dt>
- <dd><p>Global System for Mobile Communications audio
- </p>
- </dd>
- <dt>‘<samp class="samp">h261 <em class="emph">video</em></samp>’</dt>
- <dd><p>ITU-T H.261 video
- </p>
- </dd>
- <dt>‘<samp class="samp">h263 <em class="emph">video</em></samp>’</dt>
- <dd><p>ITU-T H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2 video
- </p>
- </dd>
- <dt>‘<samp class="samp">h264 <em class="emph">video</em> (h264, 264)</samp>’</dt>
- <dd><p>ITU-T H.264 / MPEG-4 Part 10 AVC video. Bitstream shall be converted
- to Annex B syntax if it’s in length-prefixed mode.
- </p>
- </dd>
- <dt>‘<samp class="samp">hevc <em class="emph">video</em> (hevc, h265, 265)</samp>’</dt>
- <dd><p>ITU-T H.265 / MPEG-H Part 2 HEVC video. Bitstream shall be converted
- to Annex B syntax if it’s in length-prefixed mode.
- </p>
- </dd>
- <dt>‘<samp class="samp">m4v <em class="emph">video</em></samp>’</dt>
- <dd><p>MPEG-4 Part 2 video
- </p>
- </dd>
- <dt>‘<samp class="samp">mjpeg <em class="emph">video</em> (mjpg, mjpeg)</samp>’</dt>
- <dd><p>Motion JPEG video
- </p>
- </dd>
- <dt>‘<samp class="samp">mlp <em class="emph">audio</em></samp>’</dt>
- <dd><p>Meridian Lossless Packing, also known as Packed PCM
- </p>
- </dd>
- <dt>‘<samp class="samp">mp2 <em class="emph">audio</em> (mp2, m2a, mpa)</samp>’</dt>
- <dd><p>MPEG-1 Audio Layer II audio
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg1video <em class="emph">video</em> (mpg, mpeg, m1v)</samp>’</dt>
- <dd><p>MPEG-1 Part 2 video.
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg2video <em class="emph">video</em> (m2v)</samp>’</dt>
- <dd><p>ITU-T H.262 / MPEG-2 Part 2 video
- </p>
- </dd>
- <dt>‘<samp class="samp">obu <em class="emph">video</em></samp>’</dt>
- <dd><p>AV1 low overhead Open Bitstream Units muxer.
- </p>
- <p>Temporal delimiter OBUs will be inserted in all temporal units of the
- stream.
- </p>
- </dd>
- <dt>‘<samp class="samp">rawvideo <em class="emph">video</em> (yuv, rgb)</samp>’</dt>
- <dd><p>Raw uncompressed video.
- </p>
- </dd>
- <dt>‘<samp class="samp">sbc <em class="emph">audio</em> (sbc, msbc)</samp>’</dt>
- <dd><p>Bluetooth SIG low-complexity subband codec audio
- </p>
- </dd>
- <dt>‘<samp class="samp">truehd <em class="emph">audio</em> (thd)</samp>’</dt>
- <dd><p>Dolby TrueHD audio
- </p>
- </dd>
- <dt>‘<samp class="samp">vc1 <em class="emph">video</em></samp>’</dt>
- <dd><p>SMPTE 421M / VC-1 video
- </p></dd>
- </dl>
- <a name="Examples-13"></a>
- <h4 class="subsection">21.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-13" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-13" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Store raw video frames with the ‘<samp class="samp">rawvideo</samp>’ muxer using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i testsrc -t 10 -s hd1080p testsrc.yuv
- </pre></div>
- <p>Since the rawvideo muxer do not store the information related to size
- and format, this information must be provided when demuxing the file:
- </p><div class="example">
- <pre class="example-preformatted">ffplay -video_size 1920x1080 -pixel_format rgb24 -f rawvideo testsrc.rgb
- </pre></div>
- </li></ul>
- <a name="Raw-PCM-muxers"></a>
- <h3 class="section">21.2 Raw PCM muxers<span class="pull-right"><a class="anchor hidden-xs" href="#Raw-PCM-muxers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Raw-PCM-muxers" aria-hidden="true">TOC</a></span></h3>
- <p>This section covers raw PCM (Pulse-Code Modulation) audio muxers.
- </p>
- <p>They accept a single stream matching the designated codec. They do not
- store timestamps or metadata. The recognized extension is the same as
- the muxer name.
- </p>
- <p>It comprises the following muxers. The optional additional extension
- used to automatically select the muxer from the output extension is
- also shown in parentheses.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">alaw (al)</samp>’</dt>
- <dd><p>PCM A-law
- </p>
- </dd>
- <dt>‘<samp class="samp">f32be</samp>’</dt>
- <dd><p>PCM 32-bit floating-point big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">f32le</samp>’</dt>
- <dd><p>PCM 32-bit floating-point little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">f64be</samp>’</dt>
- <dd><p>PCM 64-bit floating-point big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">f64le</samp>’</dt>
- <dd><p>PCM 64-bit floating-point little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">mulaw (ul)</samp>’</dt>
- <dd><p>PCM mu-law
- </p>
- </dd>
- <dt>‘<samp class="samp">s16be</samp>’</dt>
- <dd><p>PCM signed 16-bit big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">s16le</samp>’</dt>
- <dd><p>PCM signed 16-bit little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">s24be</samp>’</dt>
- <dd><p>PCM signed 24-bit big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">s24le</samp>’</dt>
- <dd><p>PCM signed 24-bit little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">s32be</samp>’</dt>
- <dd><p>PCM signed 32-bit big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">s32le</samp>’</dt>
- <dd><p>PCM signed 32-bit little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">s8 (sb)</samp>’</dt>
- <dd><p>PCM signed 8-bit
- </p>
- </dd>
- <dt>‘<samp class="samp">u16be</samp>’</dt>
- <dd><p>PCM unsigned 16-bit big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">u16le</samp>’</dt>
- <dd><p>PCM unsigned 16-bit little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">u24be</samp>’</dt>
- <dd><p>PCM unsigned 24-bit big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">u24le</samp>’</dt>
- <dd><p>PCM unsigned 24-bit little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">u32be</samp>’</dt>
- <dd><p>PCM unsigned 32-bit big-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">u32le</samp>’</dt>
- <dd><p>PCM unsigned 32-bit little-endian
- </p>
- </dd>
- <dt>‘<samp class="samp">u8 (ub)</samp>’</dt>
- <dd><p>PCM unsigned 8-bit
- </p>
- </dd>
- <dt>‘<samp class="samp">vidc</samp>’</dt>
- <dd><p>PCM Archimedes VIDC
- </p></dd>
- </dl>
- <a name="MPEG_002d1_002fMPEG_002d2-program-stream-muxers"></a>
- <h3 class="section">21.3 MPEG-1/MPEG-2 program stream muxers<span class="pull-right"><a class="anchor hidden-xs" href="#MPEG_002d1_002fMPEG_002d2-program-stream-muxers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-MPEG_002d1_002fMPEG_002d2-program-stream-muxers" aria-hidden="true">TOC</a></span></h3>
- <p>This section covers formats belonging to the MPEG-1 and MPEG-2 Systems
- family.
- </p>
- <p>The MPEG-1 Systems format (also known as ISO/IEEC 11172-1 or MPEG-1
- program stream) has been adopted for the format of media track stored
- in VCD (Video Compact Disc).
- </p>
- <p>The MPEG-2 Systems standard (also known as ISO/IEEC 13818-1) covers
- two containers formats, one known as transport stream and one known as
- program stream; only the latter is covered here.
- </p>
- <p>The MPEG-2 program stream format (also known as VOB due to the
- corresponding file extension) is an extension of MPEG-1 program
- stream: in addition to support different codecs for the audio and
- video streams, it also stores subtitles and navigation metadata.
- MPEG-2 program stream has been adopted for storing media streams in
- SVCD and DVD storage devices.
- </p>
- <p>This section comprises the following muxers.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">mpeg (mpg,mpeg)</samp>’</dt>
- <dd><p>MPEG-1 Systems / MPEG-1 program stream muxer.
- </p>
- </dd>
- <dt>‘<samp class="samp">vcd</samp>’</dt>
- <dd><p>MPEG-1 Systems / MPEG-1 program stream (VCD) muxer.
- </p>
- <p>This muxer can be used to generate tracks in the format accepted by
- the VCD (Video Compact Disc) storage devices.
- </p>
- <p>It is the same as the ‘<samp class="samp">mpeg</samp>’ muxer with a few differences.
- </p>
- </dd>
- <dt>‘<samp class="samp">vob</samp>’</dt>
- <dd><p>MPEG-2 program stream (VOB) muxer.
- </p>
- </dd>
- <dt>‘<samp class="samp">dvd</samp>’</dt>
- <dd><p>MPEG-2 program stream (DVD VOB) muxer.
- </p>
- <p>This muxer can be used to generate tracks in the format accepted by
- the DVD (Digital Versatile Disc) storage devices.
- </p>
- <p>This is the same as the ‘<samp class="samp">vob</samp>’ muxer with a few differences.
- </p>
- </dd>
- <dt>‘<samp class="samp">svcd (vob)</samp>’</dt>
- <dd><p>MPEG-2 program stream (SVCD VOB) muxer.
- </p>
- <p>This muxer can be used to generate tracks in the format accepted by
- the SVCD (Super Video Compact Disc) storage devices.
- </p>
- <p>This is the same as the ‘<samp class="samp">vob</samp>’ muxer with a few differences.
- </p></dd>
- </dl>
- <a name="Options-62"></a>
- <h4 class="subsection">21.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-62" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-62" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">muxrate <var class="var">rate</var></samp></dt>
- <dd><p>Set user-defined mux rate expressed as a number of bits/s. If not
- specified the automatically computed mux rate is employed. Default value
- is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">preload <var class="var">delay</var></samp></dt>
- <dd><p>Set initial demux-decode delay in microseconds. Default value is
- <code class="code">500000</code>.
- </p></dd>
- </dl>
- <a name="MOV_002fMPEG_002d4_002fISOMBFF-muxers"></a>
- <h3 class="section">21.4 MOV/MPEG-4/ISOMBFF muxers<span class="pull-right"><a class="anchor hidden-xs" href="#MOV_002fMPEG_002d4_002fISOMBFF-muxers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-MOV_002fMPEG_002d4_002fISOMBFF-muxers" aria-hidden="true">TOC</a></span></h3>
- <p>This section covers formats belonging to the QuickTime / MOV family,
- including the MPEG-4 Part 14 format and ISO base media file format
- (ISOBMFF). These formats share a common structure based on the ISO
- base media file format (ISOBMFF).
- </p>
- <p>The MOV format was originally developed for use with Apple QuickTime.
- It was later used as the basis for the MPEG-4 Part 1 (later Part 14)
- format, also known as ISO/IEC 14496-1. That format was then
- generalized into ISOBMFF, also named MPEG-4 Part 12 format, ISO/IEC
- 14496-12, or ISO/IEC 15444-12.
- </p>
- <p>It comprises the following muxers.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">3gp</samp>’</dt>
- <dd><p>Third Generation Partnership Project (3GPP) format for 3G UMTS
- multimedia services
- </p>
- </dd>
- <dt>‘<samp class="samp">3g2</samp>’</dt>
- <dd><p>Third Generation Partnership Project 2 (3GP2 or 3GPP2) format for 3G
- CDMA2000 multimedia services, similar to ‘<samp class="samp">3gp</samp>’ with extensions
- and limitations
- </p>
- </dd>
- <dt>‘<samp class="samp">f4v</samp>’</dt>
- <dd><p>Adobe Flash Video format
- </p>
- </dd>
- <dt>‘<samp class="samp">ipod</samp>’</dt>
- <dd><p>MPEG-4 audio file format, as MOV/MP4 but limited to contain only audio
- streams, typically played with the Apple ipod device
- </p>
- </dd>
- <dt>‘<samp class="samp">ismv</samp>’</dt>
- <dd><p>Microsoft IIS (Internet Information Services) Smooth Streaming
- Audio/Video (ISMV or ISMA) format. This is based on MPEG-4 Part 14
- format with a few incompatible variants, used to stream media files
- for the Microsoft IIS server.
- </p>
- </dd>
- <dt>‘<samp class="samp">mov</samp>’</dt>
- <dd><p>QuickTime player format identified by the <code class="code">.mov</code> extension
- </p>
- </dd>
- <dt>‘<samp class="samp">mp4</samp>’</dt>
- <dd><p>MP4 or MPEG-4 Part 14 format
- </p>
- </dd>
- <dt>‘<samp class="samp">psp</samp>’</dt>
- <dd><p>PlayStation Portable MP4/MPEG-4 Part 14 format variant. This is based
- on MPEG-4 Part 14 format with a few incompatible variants, used to
- play files on PlayStation devices.
- </p></dd>
- </dl>
- <a name="Fragmentation"></a>
- <h4 class="subsection">21.4.1 Fragmentation<span class="pull-right"><a class="anchor hidden-xs" href="#Fragmentation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Fragmentation" aria-hidden="true">TOC</a></span></h4>
- <p>The ‘<samp class="samp">mov</samp>’, ‘<samp class="samp">mp4</samp>’, and ‘<samp class="samp">ismv</samp>’ muxers support
- fragmentation. Normally, a MOV/MP4 file has all the metadata about all
- packets stored in one location.
- </p>
- <p>This data is usually written at the end of the file, but it can be
- moved to the start for better playback by adding <code class="code">+faststart</code> to
- the <code class="code">-movflags</code>, or using the <code class="command">qt-faststart</code> tool).
- </p>
- <p>A fragmented file consists of a number of fragments, where packets and
- metadata about these packets are stored together. Writing a fragmented
- file has the advantage that the file is decodable even if the writing
- is interrupted (while a normal MOV/MP4 is undecodable if it is not
- properly finished), and it requires less memory when writing very long
- files (since writing normal MOV/MP4 files stores info about every
- single packet in memory until the file is closed). The downside is
- that it is less compatible with other applications.
- </p>
- <p>Fragmentation is enabled by setting one of the options that define
- how to cut the file into fragments:
- </p><dl class="table">
- <dt><samp class="option">frag_duration</samp></dt>
- <dt><samp class="option">frag_size</samp></dt>
- <dt><samp class="option">min_frag_duration</samp></dt>
- <dt><samp class="option">movflags +frag_keyframe</samp></dt>
- <dt><samp class="option">movflags +frag_custom</samp></dt>
- </dl>
- <p>If more than one condition is specified, fragments are cut when one of
- the specified conditions is fulfilled. The exception to this is the
- option <samp class="option">min_frag_duration</samp>, which has to be fulfilled for any
- of the other conditions to apply.
- </p>
- <a name="Options-63"></a>
- <h4 class="subsection">21.4.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-63" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-63" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">brand <var class="var">brand_string</var></samp></dt>
- <dd><p>Override major brand.
- </p>
- </dd>
- <dt><samp class="option">empty_hdlr_name <var class="var">bool</var></samp></dt>
- <dd><p>Enable to skip writing the name inside a <code class="code">hdlr</code> box.
- Default is <code class="code">false</code>.
- </p>
- </dd>
- <dt><samp class="option">encryption_key <var class="var">key</var></samp></dt>
- <dd><p>set the media encryption key in hexadecimal format
- </p>
- </dd>
- <dt><samp class="option">encryption_kid <var class="var">kid</var></samp></dt>
- <dd><p>set the media encryption key identifier in hexadecimal format
- </p>
- </dd>
- <dt><samp class="option">encryption_scheme <var class="var">scheme</var></samp></dt>
- <dd><p>configure the encryption scheme, allowed values are ‘<samp class="samp">none</samp>’, and
- ‘<samp class="samp">cenc-aes-ctr</samp>’
- </p>
- </dd>
- <dt><samp class="option">frag_duration <var class="var">duration</var></samp></dt>
- <dd><p>Create fragments that are <var class="var">duration</var> microseconds long.
- </p>
- </dd>
- <dt><samp class="option">frag_interleave <var class="var">number</var></samp></dt>
- <dd><p>Interleave samples within fragments (max number of consecutive
- samples, lower is tighter interleaving, but with more overhead. It is
- set to <code class="code">0</code> by default.
- </p>
- </dd>
- <dt><samp class="option">frag_size <var class="var">size</var></samp></dt>
- <dd><p>create fragments that contain up to <var class="var">size</var> bytes of payload data
- </p>
- </dd>
- <dt><samp class="option">iods_audio_profile <var class="var">profile</var></samp></dt>
- <dd><p>specify iods number for the audio profile atom (from -1 to 255),
- default is <code class="code">-1</code>
- </p>
- </dd>
- <dt><samp class="option">iods_video_profile <var class="var">profile</var></samp></dt>
- <dd><p>specify iods number for the video profile atom (from -1 to 255),
- default is <code class="code">-1</code>
- </p>
- </dd>
- <dt><samp class="option">ism_lookahead <var class="var">num_entries</var></samp></dt>
- <dd><p>specify number of lookahead entries for ISM files (from 0 to 255),
- default is <code class="code">0</code>
- </p>
- </dd>
- <dt><samp class="option">min_frag_duration <var class="var">duration</var></samp></dt>
- <dd><p>do not create fragments that are shorter than <var class="var">duration</var> microseconds long
- </p>
- </dd>
- <dt><samp class="option">moov_size <var class="var">bytes</var></samp></dt>
- <dd><p>Reserves space for the moov atom at the beginning of the file instead of placing the
- moov atom at the end. If the space reserved is insufficient, muxing will fail.
- </p>
- </dd>
- <dt><samp class="option">mov_gamma <var class="var">gamma</var></samp></dt>
- <dd><p>specify gamma value for gama atom (as a decimal number from 0 to 10),
- default is <code class="code">0.0</code>, must be set together with <code class="code">+ movflags</code>
- </p>
- </dd>
- <dt><samp class="option">movflags <var class="var">flags</var></samp></dt>
- <dd><p>Set various muxing switches. The following flags can be used:
- </p><dl class="table">
- <dt>‘<samp class="samp">cmaf</samp>’</dt>
- <dd><p>write CMAF (Common Media Application Format) compatible fragmented
- MP4 output
- </p>
- </dd>
- <dt>‘<samp class="samp">dash</samp>’</dt>
- <dd><p>write DASH (Dynamic Adaptive Streaming over HTTP) compatible fragmented
- MP4 output
- </p>
- </dd>
- <dt>‘<samp class="samp">default_base_moof</samp>’</dt>
- <dd><p>Similarly to the ‘<samp class="samp">omit_tfhd_offset</samp>’ flag, this flag avoids
- writing the absolute base_data_offset field in tfhd atoms, but does so
- by using the new default-base-is-moof flag instead. This flag is new
- from 14496-12:2012. This may make the fragments easier to parse in
- certain circumstances (avoiding basing track fragment location
- calculations on the implicit end of the previous track fragment).
- </p>
- </dd>
- <dt>‘<samp class="samp">delay_moov</samp>’</dt>
- <dd><p>delay writing the initial moov until the first fragment is cut, or
- until the first fragment flush
- </p>
- </dd>
- <dt>‘<samp class="samp">disable_chpl</samp>’</dt>
- <dd><p>Disable Nero chapter markers (chpl atom). Normally, both Nero chapters
- and a QuickTime chapter track are written to the file. With this
- option set, only the QuickTime chapter track will be written. Nero
- chapters can cause failures when the file is reprocessed with certain
- tagging programs, like mp3Tag 2.61a and iTunes 11.3, most likely other
- versions are affected as well.
- </p>
- </dd>
- <dt>‘<samp class="samp">faststart</samp>’</dt>
- <dd><p>Run a second pass moving the index (moov atom) to the beginning of the
- file. This operation can take a while, and will not work in various
- situations such as fragmented output, thus it is not enabled by
- default.
- </p>
- </dd>
- <dt>‘<samp class="samp">frag_custom</samp>’</dt>
- <dd><p>Allow the caller to manually choose when to cut fragments, by calling
- <code class="code">av_write_frame(ctx, NULL)</code> to write a fragment with the packets
- written so far. (This is only useful with other applications
- integrating libavformat, not from <code class="command">ffmpeg</code>.)
- </p>
- </dd>
- <dt>‘<samp class="samp">frag_discont</samp>’</dt>
- <dd><p>signal that the next fragment is discontinuous from earlier ones
- </p>
- </dd>
- <dt>‘<samp class="samp">frag_every_frame</samp>’</dt>
- <dd><p>fragment at every frame
- </p>
- </dd>
- <dt>‘<samp class="samp">frag_keyframe</samp>’</dt>
- <dd><p>start a new fragment at each video keyframe
- </p>
- </dd>
- <dt>‘<samp class="samp">global_sidx</samp>’</dt>
- <dd><p>write a global sidx index at the start of the file
- </p>
- </dd>
- <dt>‘<samp class="samp">isml</samp>’</dt>
- <dd><p>create a live smooth streaming feed (for pushing to a publishing point)
- </p>
- </dd>
- <dt>‘<samp class="samp">negative_cts_offsets</samp>’</dt>
- <dd><p>Enables utilization of version 1 of the CTTS box, in which the CTS offsets can
- be negative. This enables the initial sample to have DTS/CTS of zero, and
- reduces the need for edit lists for some cases such as video tracks with
- B-frames. Additionally, eases conformance with the DASH-IF interoperability
- guidelines.
- </p>
- <p>This option is implicitly set when writing ‘<samp class="samp">ismv</samp>’ (Smooth
- Streaming) files.
- </p>
- </dd>
- <dt>‘<samp class="samp">omit_tfhd_offset</samp>’</dt>
- <dd><p>Do not write any absolute base_data_offset in tfhd atoms. This avoids
- tying fragments to absolute byte positions in the file/streams.
- </p>
- </dd>
- <dt>‘<samp class="samp">prefer_icc</samp>’</dt>
- <dd><p>If writing colr atom prioritise usage of ICC profile if it exists in
- stream packet side data.
- </p>
- </dd>
- <dt>‘<samp class="samp">rtphint</samp>’</dt>
- <dd><p>add RTP hinting tracks to the output file
- </p>
- </dd>
- <dt>‘<samp class="samp">separate_moof</samp>’</dt>
- <dd><p>Write a separate moof (movie fragment) atom for each track. Normally,
- packets for all tracks are written in a moof atom (which is slightly
- more efficient), but with this option set, the muxer writes one
- moof/mdat pair for each track, making it easier to separate tracks.
- </p>
- </dd>
- <dt>‘<samp class="samp">skip_sidx</samp>’</dt>
- <dd><p>Skip writing of sidx atom. When bitrate overhead due to sidx atom is
- high, this option could be used for cases where sidx atom is not
- mandatory. When the ‘<samp class="samp">global_sidx</samp>’ flag is enabled, this option
- is ignored.
- </p>
- </dd>
- <dt>‘<samp class="samp">skip_trailer</samp>’</dt>
- <dd><p>skip writing the mfra/tfra/mfro trailer for fragmented files
- </p>
- </dd>
- <dt>‘<samp class="samp">use_metadata_tags</samp>’</dt>
- <dd><p>use mdta atom for metadata
- </p>
- </dd>
- <dt>‘<samp class="samp">write_colr</samp>’</dt>
- <dd><p>write colr atom even if the color info is unspecified. This flag is
- experimental, may be renamed or changed, do not use from scripts.
- </p>
- </dd>
- <dt>‘<samp class="samp">write_gama</samp>’</dt>
- <dd><p>write deprecated gama atom
- </p>
- </dd>
- <dt>‘<samp class="samp">hybrid_fragmented</samp>’</dt>
- <dd><p>For recoverability - write the output file as a fragmented file.
- This allows the intermediate file to be read while being written
- (in particular, if the writing process is aborted uncleanly). When
- writing is finished, the file is converted to a regular, non-fragmented
- file, which is more compatible and allows easier and quicker seeking.
- </p>
- <p>If writing is aborted, the intermediate file can manually be
- remuxed to get a regular, non-fragmented file of what had been
- written into the unfinished file.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">movie_timescale <var class="var">scale</var></samp></dt>
- <dd><p>Set the timescale written in the movie header box (<code class="code">mvhd</code>).
- Range is 1 to INT_MAX. Default is <code class="code">1000</code>.
- </p>
- </dd>
- <dt><samp class="option">rtpflags <var class="var">flags</var></samp></dt>
- <dd><p>Add RTP hinting tracks to the output file.
- </p>
- <p>The following flags can be used:
- </p><dl class="table">
- <dt>‘<samp class="samp">h264_mode0</samp>’</dt>
- <dd><p>use mode 0 for H.264 in RTP
- </p>
- </dd>
- <dt>‘<samp class="samp">latm</samp>’</dt>
- <dd><p>use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC
- </p>
- </dd>
- <dt>‘<samp class="samp">rfc2190</samp>’</dt>
- <dd><p>use RFC 2190 packetization instead of RFC 4629 for H.263
- </p>
- </dd>
- <dt>‘<samp class="samp">send_bye</samp>’</dt>
- <dd><p>send RTCP BYE packets when finishing
- </p>
- </dd>
- <dt>‘<samp class="samp">skip_rtcp</samp>’</dt>
- <dd><p>do not send RTCP sender reports
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">skip_iods <var class="var">bool</var></samp></dt>
- <dd><p>skip writing iods atom (default value is <code class="code">true</code>)
- </p>
- </dd>
- <dt><samp class="option">use_editlist <var class="var">bool</var></samp></dt>
- <dd><p>use edit list (default value is <code class="code">auto</code>)
- </p>
- </dd>
- <dt><samp class="option">use_stream_ids_as_track_ids <var class="var">bool</var></samp></dt>
- <dd><p>use stream ids as track ids (default value is <code class="code">false</code>)
- </p>
- </dd>
- <dt><samp class="option">video_track_timescale <var class="var">scale</var></samp></dt>
- <dd><p>Set the timescale used for video tracks. Range is <code class="code">0</code> to INT_MAX. If
- set to <code class="code">0</code>, the timescale is automatically set based on the
- native stream time base. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">write_btrt <var class="var">bool</var></samp></dt>
- <dd><p>Force or disable writing bitrate box inside stsd box of a track. The
- box contains decoding buffer size (in bytes), maximum bitrate and
- average bitrate for the track. The box will be skipped if none of
- these values can be computed. Default is <code class="code">-1</code> or <code class="code">auto</code>,
- which will write the box only in MP4 mode.
- </p>
- </dd>
- <dt><samp class="option">write_prft <var class="var">option</var></samp></dt>
- <dd><p>Write producer time reference box (PRFT) with a specified time source for the
- NTP field in the PRFT box. Set value as ‘<samp class="samp">wallclock</samp>’ to specify timesource
- as wallclock time and ‘<samp class="samp">pts</samp>’ to specify timesource as input packets’ PTS
- values.
- </p>
- </dd>
- <dt><samp class="option">write_tmcd <var class="var">bool</var></samp></dt>
- <dd><p>Specify <code class="code">on</code> to force writing a timecode track, <code class="code">off</code> to disable it
- and <code class="code">auto</code> to write a timecode track only for mov and mp4 output (default).
- </p>
- <p>Setting value to ‘<samp class="samp">pts</samp>’ is applicable only for a live encoding use case,
- where PTS values are set as as wallclock time at the source. For example, an
- encoding use case with decklink capture source where <samp class="option">video_pts</samp> and
- <samp class="option">audio_pts</samp> are set to ‘<samp class="samp">abs_wallclock</samp>’.
- </p></dd>
- </dl>
- <a name="Examples-14"></a>
- <h4 class="subsection">21.4.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-14" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-14" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Push Smooth Streaming content in real time to a publishing point on
- IIS with the ‘<samp class="samp">ismv</samp>’ muxer using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re <var class="var"><normal input/transcoding options></var> -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)
- </pre></div>
- </li></ul>
- <a class="anchor" id="a64"></a><a name="a64-1"></a>
- <h3 class="section">21.5 a64<span class="pull-right"><a class="anchor hidden-xs" href="#a64-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-a64-1" aria-hidden="true">TOC</a></span></h3>
- <p>A64 Commodore 64 video muxer.
- </p>
- <p>This muxer accepts a single <code class="code">a64_multi</code> or <code class="code">a64_multi5</code>
- codec video stream.
- </p>
- <a name="ac4"></a>
- <h3 class="section">21.6 ac4<span class="pull-right"><a class="anchor hidden-xs" href="#ac4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ac4" aria-hidden="true">TOC</a></span></h3>
- <p>Raw AC-4 audio muxer.
- </p>
- <p>This muxer accepts a single <code class="code">ac4</code> audio stream.
- </p>
- <a name="Options-64"></a>
- <h4 class="subsection">21.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-64" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-64" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">write_crc <var class="var">bool</var></samp></dt>
- <dd><p>when enabled, write a CRC checksum for each packet to the output,
- default is <code class="code">false</code>
- </p></dd>
- </dl>
- <a class="anchor" id="adts"></a><a name="adts-1"></a>
- <h3 class="section">21.7 adts<span class="pull-right"><a class="anchor hidden-xs" href="#adts-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adts-1" aria-hidden="true">TOC</a></span></h3>
- <p>Audio Data Transport Stream muxer.
- </p>
- <p>It accepts a single AAC stream.
- </p>
- <a name="Options-65"></a>
- <h4 class="subsection">21.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-65" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-65" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">write_id3v2 <var class="var">bool</var></samp></dt>
- <dd><p>Enable to write ID3v2.4 tags at the start of the stream. Default is
- disabled.
- </p>
- </dd>
- <dt><samp class="option">write_apetag <var class="var">bool</var></samp></dt>
- <dd><p>Enable to write APE tags at the end of the stream. Default is
- disabled.
- </p>
- </dd>
- <dt><samp class="option">write_mpeg2 <var class="var">bool</var></samp></dt>
- <dd><p>Enable to set MPEG version bit in the ADTS frame header to 1 which
- indicates MPEG-2. Default is 0, which indicates MPEG-4.
- </p></dd>
- </dl>
- <a class="anchor" id="aea"></a><a name="aea-1"></a>
- <h3 class="section">21.8 aea<span class="pull-right"><a class="anchor hidden-xs" href="#aea-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aea-1" aria-hidden="true">TOC</a></span></h3>
- <p>MD STUDIO audio muxer.
- </p>
- <p>This muxer accepts a single ATRAC1 audio stream with either one or two channels
- and a sample rate of 44100Hz.
- </p>
- <p>As AEA supports storing the track title, this muxer will also write
- the title from stream’s metadata to the container.
- </p>
- <a class="anchor" id="aiff"></a><a name="aiff-1"></a>
- <h3 class="section">21.9 aiff<span class="pull-right"><a class="anchor hidden-xs" href="#aiff-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aiff-1" aria-hidden="true">TOC</a></span></h3>
- <p>Audio Interchange File Format muxer.
- </p>
- <a name="Options-66"></a>
- <h4 class="subsection">21.9.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-66" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-66" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">write_id3v2 <var class="var">bool</var></samp></dt>
- <dd><p>Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).
- </p>
- </dd>
- <dt><samp class="option">id3v2_version <var class="var">bool</var></samp></dt>
- <dd><p>Select ID3v2 version to write. Currently only version 3 and 4 (aka.
- ID3v2.3 and ID3v2.4) are supported. The default is version 4.
- </p></dd>
- </dl>
- <a class="anchor" id="alp"></a><a name="alp-1"></a>
- <h3 class="section">21.10 alp<span class="pull-right"><a class="anchor hidden-xs" href="#alp-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alp-1" aria-hidden="true">TOC</a></span></h3>
- <p>High Voltage Software’s Lego Racers game audio muxer.
- </p>
- <p>It accepts a single ADPCM_IMA_ALP stream with no more than 2 channels
- and a sample rate not greater than 44100 Hz.
- </p>
- <p>Extensions: <code class="code">tun</code>, <code class="code">pcm</code>
- </p>
- <a name="Options-67"></a>
- <h4 class="subsection">21.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-67" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-67" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">type <var class="var">type</var></samp></dt>
- <dd><p>Set file type.
- </p>
- <p><var class="var">type</var> accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">tun</samp>’</dt>
- <dd><p>Set file type as music. Must have a sample rate of 22050 Hz.
- </p>
- </dd>
- <dt>‘<samp class="samp">pcm</samp>’</dt>
- <dd><p>Set file type as sfx.
- </p>
- </dd>
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Set file type as per output file extension. <code class="code">.pcm</code> results in
- type <code class="code">pcm</code> else type <code class="code">tun</code> is set. <var class="var">(default)</var>
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="amr"></a>
- <h3 class="section">21.11 amr<span class="pull-right"><a class="anchor hidden-xs" href="#amr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amr" aria-hidden="true">TOC</a></span></h3>
- <p>3GPP AMR (Adaptive Multi-Rate) audio muxer.
- </p>
- <p>It accepts a single audio stream containing an AMR NB stream.
- </p>
- <a name="amv"></a>
- <h3 class="section">21.12 amv<span class="pull-right"><a class="anchor hidden-xs" href="#amv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amv" aria-hidden="true">TOC</a></span></h3>
- <p>AMV (Actions Media Video) format muxer.
- </p>
- <a name="apm"></a>
- <h3 class="section">21.13 apm<span class="pull-right"><a class="anchor hidden-xs" href="#apm" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apm" aria-hidden="true">TOC</a></span></h3>
- <p>Ubisoft Rayman 2 APM audio muxer.
- </p>
- <p>It accepts a single ADPCM IMA APM audio stream.
- </p>
- <a name="apng-1"></a>
- <h3 class="section">21.14 apng<span class="pull-right"><a class="anchor hidden-xs" href="#apng-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apng-1" aria-hidden="true">TOC</a></span></h3>
- <p>Animated Portable Network Graphics muxer.
- </p>
- <p>It accepts a single APNG video stream.
- </p>
- <a name="Options-68"></a>
- <h4 class="subsection">21.14.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-68" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-68" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">final_delay <var class="var">delay</var></samp></dt>
- <dd><p>Force a delay expressed in seconds after the last frame of each
- repetition. Default value is <code class="code">0.0</code>.
- </p>
- </dd>
- <dt><samp class="option">plays <var class="var">repetitions</var></samp></dt>
- <dd><p>specify how many times to play the content, <code class="code">0</code> causes an infinite
- loop, with <code class="code">1</code> there is no loop
- </p></dd>
- </dl>
- <a name="Examples-15"></a>
- <h4 class="subsection">21.14.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-15" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-15" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> to generate an APNG output with 2 repetitions,
- and with a delay of half a second after the first repetition:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -final_delay 0.5 -plays 2 out.apng
- </pre></div>
- </li></ul>
- <a name="argo_005fasf"></a>
- <h3 class="section">21.15 argo_asf<span class="pull-right"><a class="anchor hidden-xs" href="#argo_005fasf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-argo_005fasf" aria-hidden="true">TOC</a></span></h3>
- <p>Argonaut Games ASF audio muxer.
- </p>
- <p>It accepts a single ADPCM audio stream.
- </p>
- <a name="Options-69"></a>
- <h4 class="subsection">21.15.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-69" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-69" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">version_major <var class="var">version</var></samp></dt>
- <dd><p>override file major version, specified as an integer, default value is
- <code class="code">2</code>
- </p>
- </dd>
- <dt><samp class="option">version_minor <var class="var">version</var></samp></dt>
- <dd><p>override file minor version, specified as an integer, default value is
- <code class="code">1</code>
- </p>
- </dd>
- <dt><samp class="option">name <var class="var">name</var></samp></dt>
- <dd><p>Embed file name into file, if not specified use the output file
- name. The name is truncated to 8 characters.
- </p></dd>
- </dl>
- <a name="argo_005fcvg"></a>
- <h3 class="section">21.16 argo_cvg<span class="pull-right"><a class="anchor hidden-xs" href="#argo_005fcvg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-argo_005fcvg" aria-hidden="true">TOC</a></span></h3>
- <p>Argonaut Games CVG audio muxer.
- </p>
- <p>It accepts a single one-channel ADPCM 22050Hz audio stream.
- </p>
- <p>The <samp class="option">loop</samp> and <samp class="option">reverb</samp> options set the corresponding
- flags in the header which can be later retrieved to process the audio
- stream accordingly.
- </p>
- <a name="Options-70"></a>
- <h4 class="subsection">21.16.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-70" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-70" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">skip_rate_check <var class="var">bool</var></samp></dt>
- <dd><p>skip sample rate check (default is <code class="code">false</code>)
- </p>
- </dd>
- <dt><samp class="option">loop <var class="var">bool</var></samp></dt>
- <dd><p>set loop flag (default is <code class="code">false</code>)
- </p>
- </dd>
- <dt><samp class="option">reverb <var class="var">boolean</var></samp></dt>
- <dd><p>set reverb flag (default is <code class="code">true</code>)
- </p></dd>
- </dl>
- <a class="anchor" id="asf"></a><a name="asf_002c-asf_005fstream"></a>
- <h3 class="section">21.17 asf, asf_stream<span class="pull-right"><a class="anchor hidden-xs" href="#asf_002c-asf_005fstream" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asf_002c-asf_005fstream" aria-hidden="true">TOC</a></span></h3>
- <p>Advanced / Active Systems (or Streaming) Format audio muxer.
- </p>
- <p>The ‘<samp class="samp">asf_stream</samp>’ variant should be selected for streaming.
- </p>
- <p>Note that Windows Media Audio (wma) and Windows Media Video (wmv) use this
- muxer too.
- </p>
- <a name="Options-71"></a>
- <h4 class="subsection">21.17.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-71" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-71" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">packet_size <var class="var">size</var></samp></dt>
- <dd><p>Set the muxer packet size as a number of bytes. By tuning this setting
- you may reduce data fragmentation or muxer overhead depending on your
- source. Default value is <code class="code">3200</code>, minimum is <code class="code">100</code>, maximum
- is <code class="code">64Ki</code>.
- </p></dd>
- </dl>
- <a name="ass"></a>
- <h3 class="section">21.18 ass<span class="pull-right"><a class="anchor hidden-xs" href="#ass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ass" aria-hidden="true">TOC</a></span></h3>
- <p>ASS/SSA (SubStation Alpha) subtitles muxer.
- </p>
- <p>It accepts a single ASS subtitles stream.
- </p>
- <a name="Options-72"></a>
- <h4 class="subsection">21.18.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-72" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-72" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">ignore_readorder <var class="var">bool</var></samp></dt>
- <dd><p>Write dialogue events immediately, even if they are out-of-order,
- default is <code class="code">false</code>, otherwise they are cached until the expected
- time event is found.
- </p></dd>
- </dl>
- <a name="ast"></a>
- <h3 class="section">21.19 ast<span class="pull-right"><a class="anchor hidden-xs" href="#ast" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ast" aria-hidden="true">TOC</a></span></h3>
- <p>AST (Audio Stream) muxer.
- </p>
- <p>This format is used to play audio on some Nintendo Wii games.
- </p>
- <p>It accepts a single audio stream.
- </p>
- <p>The <samp class="option">loopstart</samp> and <samp class="option">loopend</samp> options can be used to
- define a section of the file to loop for players honoring such
- options.
- </p>
- <a name="Options-73"></a>
- <h4 class="subsection">21.19.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-73" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-73" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">loopstart <var class="var">start</var></samp></dt>
- <dd><p>Specify loop start position expressesd in milliseconds, from <code class="code">-1</code>
- to <code class="code">INT_MAX</code>, in case <code class="code">-1</code> is set then no loop is specified
- (default -1) and the <samp class="option">loopend</samp> value is ignored.
- </p>
- </dd>
- <dt><samp class="option">loopend <var class="var">end</var></samp></dt>
- <dd><p>Specify loop end position expressed in milliseconds, from <code class="code">0</code> to
- <code class="code">INT_MAX</code>, default is <code class="code">0</code>, in case <code class="code">0</code> is set it
- assumes the total stream duration.
- </p></dd>
- </dl>
- <a name="au"></a>
- <h3 class="section">21.20 au<span class="pull-right"><a class="anchor hidden-xs" href="#au" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-au" aria-hidden="true">TOC</a></span></h3>
- <p>SUN AU audio muxer.
- </p>
- <p>It accepts a single audio stream.
- </p>
- <a class="anchor" id="avi"></a><a name="avi-1"></a>
- <h3 class="section">21.21 avi<span class="pull-right"><a class="anchor hidden-xs" href="#avi-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avi-1" aria-hidden="true">TOC</a></span></h3>
- <p>Audio Video Interleaved muxer.
- </p>
- <p>AVI is a proprietary format developed by Microsoft, and later formally specified
- through the Open DML specification.
- </p>
- <p>Because of differences in players implementations, it might be required to set
- some options to make sure that the generated output can be correctly played by
- the target player.
- </p>
- <a name="Options-74"></a>
- <h4 class="subsection">21.21.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-74" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-74" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">flipped_raw_rgb <var class="var">bool</var></samp></dt>
- <dd><p>If set to <code class="code">true</code>, store positive height for raw RGB bitmaps, which
- indicates bitmap is stored bottom-up. Note that this option does not flip the
- bitmap which has to be done manually beforehand, e.g. by using the ‘<samp class="samp">vflip</samp>’
- filter. Default is <code class="code">false</code> and indicates bitmap is stored top down.
- </p>
- </dd>
- <dt><samp class="option">reserve_index_space <var class="var">size</var></samp></dt>
- <dd><p>Reserve the specified amount of bytes for the OpenDML master index of each
- stream within the file header. By default additional master indexes are
- embedded within the data packets if there is no space left in the first master
- index and are linked together as a chain of indexes. This index structure can
- cause problems for some use cases, e.g. third-party software strictly relying
- on the OpenDML index specification or when file seeking is slow. Reserving
- enough index space in the file header avoids these problems.
- </p>
- <p>The required index space depends on the output file size and should be about 16
- bytes per gigabyte. When this option is omitted or set to zero the necessary
- index space is guessed.
- </p>
- <p>Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">write_channel_mask <var class="var">bool</var></samp></dt>
- <dd><p>Write the channel layout mask into the audio stream header.
- </p>
- <p>This option is enabled by default. Disabling the channel mask can be useful in
- specific scenarios, e.g. when merging multiple audio streams into one for
- compatibility with software that only supports a single audio stream in AVI
- (see <a data-manual="ffmpeg-filters" href="ffmpeg-filters.html#amerge">the "amerge" section in the ffmpeg-filters manual</a>).
- </p></dd>
- </dl>
- <a name="avif"></a>
- <h3 class="section">21.22 avif<span class="pull-right"><a class="anchor hidden-xs" href="#avif" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avif" aria-hidden="true">TOC</a></span></h3>
- <p>AV1 (Alliance for Open Media Video codec 1) image format muxer.
- </p>
- <p>This muxers stores images encoded using the AV1 codec.
- </p>
- <p>It accepts one or two video streams. In case two video streams are
- provided, the second one shall contain a single plane storing the
- alpha mask.
- </p>
- <p>In case more than one image is provided, the generated output is
- considered an animated AVIF and the number of loops can be specified
- with the <samp class="option">loop</samp> option.
- </p>
- <p>This is based on the specification by Alliance for Open Media at url
- <a class="url" href="https://aomediacodec.github.io/av1-avif">https://aomediacodec.github.io/av1-avif</a>.
- </p>
- <a name="Options-75"></a>
- <h4 class="subsection">21.22.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-75" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-75" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">loop <var class="var">count</var></samp></dt>
- <dd><p>number of times to loop an animated AVIF, <code class="code">0</code> specify an infinite
- loop, default is <code class="code">0</code>
- </p>
- </dd>
- <dt><samp class="option">movie_timescale <var class="var">timescale</var></samp></dt>
- <dd><p>Set the timescale written in the movie header box (<code class="code">mvhd</code>).
- Range is 1 to INT_MAX. Default is <code class="code">1000</code>.
- </p></dd>
- </dl>
- <a name="avm2"></a>
- <h3 class="section">21.23 avm2<span class="pull-right"><a class="anchor hidden-xs" href="#avm2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avm2" aria-hidden="true">TOC</a></span></h3>
- <p>ShockWave Flash (SWF) / ActionScript Virtual Machine 2 (AVM2) format muxer.
- </p>
- <p>It accepts one audio stream, one video stream, or both.
- </p>
- <a name="bit"></a>
- <h3 class="section">21.24 bit<span class="pull-right"><a class="anchor hidden-xs" href="#bit" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bit" aria-hidden="true">TOC</a></span></h3>
- <p>G.729 (.bit) file format muxer.
- </p>
- <p>It accepts a single G.729 audio stream.
- </p>
- <a name="caf"></a>
- <h3 class="section">21.25 caf<span class="pull-right"><a class="anchor hidden-xs" href="#caf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-caf" aria-hidden="true">TOC</a></span></h3>
- <p>Apple CAF (Core Audio Format) muxer.
- </p>
- <p>It accepts a single audio stream.
- </p>
- <a name="codec2"></a>
- <h3 class="section">21.26 codec2<span class="pull-right"><a class="anchor hidden-xs" href="#codec2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-codec2" aria-hidden="true">TOC</a></span></h3>
- <p>Codec2 audio audio muxer.
- </p>
- <p>It accepts a single codec2 audio stream.
- </p>
- <a class="anchor" id="chromaprint"></a><a name="chromaprint-1"></a>
- <h3 class="section">21.27 chromaprint<span class="pull-right"><a class="anchor hidden-xs" href="#chromaprint-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromaprint-1" aria-hidden="true">TOC</a></span></h3>
- <p>Chromaprint fingerprinter muxers.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-chromaprint</code>.
- </p>
- <p>This muxer feeds audio data to the Chromaprint library, which
- generates a fingerprint for the provided audio data. See:
- <a class="url" href="https://acoustid.org/chromaprint">https://acoustid.org/chromaprint</a>
- </p>
- <p>It takes a single signed native-endian 16-bit raw audio stream of at
- most 2 channels.
- </p>
- <a name="Options-76"></a>
- <h4 class="subsection">21.27.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-76" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-76" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">algorithm <var class="var">version</var></samp></dt>
- <dd><p>Select version of algorithm to fingerprint with. Range is <code class="code">0</code> to
- <code class="code">4</code>. Version <code class="code">3</code> enables silence detection. Default is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">fp_format <var class="var">format</var></samp></dt>
- <dd><p>Format to output the fingerprint as. Accepts the following options:
- </p><dl class="table">
- <dt>‘<samp class="samp">base64</samp>’</dt>
- <dd><p>Base64 compressed fingerprint <em class="emph">(default)</em>
- </p>
- </dd>
- <dt>‘<samp class="samp">compressed</samp>’</dt>
- <dd><p>Binary compressed fingerprint
- </p>
- </dd>
- <dt>‘<samp class="samp">raw</samp>’</dt>
- <dd><p>Binary raw fingerprint
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">silence_threshold <var class="var">threshold</var></samp></dt>
- <dd><p>Threshold for detecting silence. Range is from <code class="code">-1</code> to
- <code class="code">32767</code>, where <code class="code">-1</code> disables silence detection. Silence
- detection can only be used with version <code class="code">3</code> of the algorithm.
- </p>
- <p>Silence detection must be disabled for use with the AcoustID
- service. Default is <code class="code">-1</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="crc"></a><a name="crc-1"></a>
- <h3 class="section">21.28 crc<span class="pull-right"><a class="anchor hidden-xs" href="#crc-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-crc-1" aria-hidden="true">TOC</a></span></h3>
- <p>CRC (Cyclic Redundancy Check) muxer.
- </p>
- <p>This muxer computes and prints the Adler-32 CRC of all the input audio
- and video frames. By default audio frames are converted to signed
- 16-bit raw audio and video frames to raw video before computing the
- CRC.
- </p>
- <p>The output of the muxer consists of a single line of the form:
- CRC=0x<var class="var">CRC</var>, where <var class="var">CRC</var> is a hexadecimal number 0-padded to
- 8 digits containing the CRC for all the decoded input frames.
- </p>
- <p>See also the <a class="ref" href="#framecrc">framecrc</a> muxer.
- </p>
- <a name="Examples-16"></a>
- <h4 class="subsection">21.28.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-16" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-16" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> to compute the CRC of the input, and store it in
- the file <samp class="file">out.crc</samp>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f crc out.crc
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to print the CRC to stdout with the command:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f crc -
- </pre></div>
- </li><li>You can select the output format of each frame with <code class="command">ffmpeg</code> by
- specifying the audio and video codec and format. For example, to
- compute the CRC of the input audio converted to PCM unsigned 8-bit
- and the input video converted to MPEG-2 video, use the command:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f crc -
- </pre></div>
- </li></ul>
- <a class="anchor" id="dash"></a><a name="dash-2"></a>
- <h3 class="section">21.29 dash<span class="pull-right"><a class="anchor hidden-xs" href="#dash-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dash-2" aria-hidden="true">TOC</a></span></h3>
- <p>Dynamic Adaptive Streaming over HTTP (DASH) muxer.
- </p>
- <p>This muxer creates segments and manifest files according to the
- MPEG-DASH standard ISO/IEC 23009-1:2014 and following standard
- updates.
- </p>
- <p>For more information see:
- </p><ul class="itemize mark-bullet">
- <li>ISO DASH Specification: <a class="url" href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip</a>
- </li><li>WebM DASH Specification: <a class="url" href="https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification">https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification</a>
- </li></ul>
- <p>This muxer creates an MPD (Media Presentation Description) manifest
- file and segment files for each stream. Segment files are placed in
- the same directory of the MPD manifest file.
- </p>
- <p>The segment filename might contain pre-defined identifiers used in the
- manifest <code class="code">SegmentTemplate</code> section as defined in section
- 5.3.9.4.4 of the standard.
- </p>
- <p>Available identifiers are <code class="code">$RepresentationID$</code>, <code class="code">$Number$</code>,
- <code class="code">$Bandwidth$</code>, and <code class="code">$Time$</code>. In addition to the standard
- identifiers, an ffmpeg-specific <code class="code">$ext$</code> identifier is also
- supported. When specified, <code class="command">ffmpeg</code> will replace <code class="code">$ext$</code>
- in the file name with muxing format’s extensions such as <code class="code">mp4</code>,
- <code class="code">webm</code> etc.
- </p>
- <a name="Options-77"></a>
- <h4 class="subsection">21.29.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-77" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-77" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">adaptation_sets <var class="var">adaptation_sets</var></samp></dt>
- <dd><p>Assign streams to adaptation sets, specified in the MPD manifest
- <code class="code">AdaptationSets</code> section.
- </p>
- <p>An adaptation set contains a set of one or more streams accessed as a
- single subset, e.g. corresponding streams encoded at different size
- selectable by the user depending on the available bandwidth, or to
- different audio streams with a different language.
- </p>
- <p>Each adaptation set is specified with the syntax:
- </p><div class="example">
- <pre class="example-preformatted">id=<var class="var">index</var>,streams=<var class="var">streams</var>
- </pre></div>
- <p>where <var class="var">index</var> must be a numerical index, and <var class="var">streams</var> is a
- sequence of <code class="code">,</code>-separated stream indices. Multiple adaptation
- sets can be specified, separated by spaces.
- </p>
- <p>To map all video (or audio) streams to an adaptation set, <code class="code">v</code> (or
- <code class="code">a</code>) can be used as stream identifier instead of IDs.
- </p>
- <p>When no assignment is defined, this defaults to an adaptation set for
- each stream.
- </p>
- <p>The following optional fields can also be specified:
- </p>
- <dl class="table">
- <dt><samp class="option">descriptor</samp></dt>
- <dd><p>Define the descriptor as defined by ISO/IEC 23009-1:2014/Amd.2:2015.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted"><SupplementalProperty schemeIdUri=\"urn:mpeg:dash:srd:2014\" value=\"0,0,0,1,1,2,2\"/>
- </pre></div>
- <p>The descriptor string should be a self-closing XML tag.
- </p>
- </dd>
- <dt><samp class="option">frag_duration</samp></dt>
- <dd><p>Override the global fragment duration specified with the
- <samp class="option">frag_duration</samp> option.
- </p>
- </dd>
- <dt><samp class="option">frag_type</samp></dt>
- <dd><p>Override the global fragment type specified with the
- <samp class="option">frag_type</samp> option.
- </p>
- </dd>
- <dt><samp class="option">seg_duration</samp></dt>
- <dd><p>Override the global segment duration specified with the
- <samp class="option">seg_duration</samp> option.
- </p>
- </dd>
- <dt><samp class="option">trick_id</samp></dt>
- <dd><p>Mark an adaptation set as containing streams meant to be used for
- Trick Mode for the referenced adaptation set.
- </p></dd>
- </dl>
- <p>A few examples of possible values for the <samp class="option">adaptation_sets</samp>
- option follow:
- </p><div class="example">
- <pre class="example-preformatted">id=0,seg_duration=2,frag_duration=1,frag_type=duration,streams=v id=1,seg_duration=2,frag_type=none,streams=a
- </pre></div>
- <div class="example">
- <pre class="example-preformatted">id=0,seg_duration=2,frag_type=none,streams=0 id=1,seg_duration=10,frag_type=none,trick_id=0,streams=1
- </pre></div>
- </dd>
- <dt><samp class="option">dash_segment_type <var class="var">type</var></samp></dt>
- <dd><p>Set DASH segment files type.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>The dash segment files format will be selected based on the stream
- codec. This is the default mode.
- </p></dd>
- <dt>‘<samp class="samp">mp4</samp>’</dt>
- <dd><p>the dash segment files will be in ISOBMFF/MP4 format
- </p></dd>
- <dt>‘<samp class="samp">webm</samp>’</dt>
- <dd><p>the dash segment files will be in WebM format
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">extra_window_size <var class="var">size</var></samp></dt>
- <dd><p>Set the maximum number of segments kept outside of the manifest before
- removing from disk.
- </p>
- </dd>
- <dt><samp class="option">format_options <var class="var">options_list</var></samp></dt>
- <dd><p>Set container format (mp4/webm) options using a <code class="code">:</code>-separated list of
- key=value parameters. Values containing <code class="code">:</code> special characters must be
- escaped.
- </p>
- </dd>
- <dt><samp class="option">frag_duration <var class="var">duration</var></samp></dt>
- <dd><p>Set the length in seconds of fragments within segments, fractional
- value can also be set.
- </p>
- </dd>
- <dt><samp class="option">frag_type <var class="var">type</var></samp></dt>
- <dd><p>Set the type of interval for fragmentation.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>set one fragment per segment
- </p>
- </dd>
- <dt>‘<samp class="samp">every_frame</samp>’</dt>
- <dd><p>fragment at every frame
- </p>
- </dd>
- <dt>‘<samp class="samp">duration</samp>’</dt>
- <dd><p>fragment at specific time intervals
- </p>
- </dd>
- <dt>‘<samp class="samp">pframes</samp>’</dt>
- <dd><p>fragment at keyframes and following P-Frame reordering (Video only,
- experimental)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">global_sidx <var class="var">bool</var></samp></dt>
- <dd><p>Write global <code class="code">SIDX</code> atom. Applicable only for single file, mp4
- output, non-streaming mode.
- </p>
- </dd>
- <dt><samp class="option">hls_master_name <var class="var">file_name</var></samp></dt>
- <dd><p>HLS master playlist name. Default is <samp class="file">master.m3u8</samp>.
- </p>
- </dd>
- <dt><samp class="option">hls_playlist <var class="var">bool</var></samp></dt>
- <dd><p>Generate HLS playlist files. The master playlist is generated with
- filename specified by the <samp class="option">hls_master_name</samp> option. One media
- playlist file is generated for each stream with filenames
- <samp class="file">media_0.m3u8</samp>, <samp class="file">media_1.m3u8</samp>, etc.
- </p>
- </dd>
- <dt><samp class="option">http_opts <var class="var">http_opts</var></samp></dt>
- <dd><p>Specify a list of <code class="code">:</code>-separated key=value options to pass to the
- underlying HTTP protocol. Applicable only for HTTP output.
- </p>
- </dd>
- <dt><samp class="option">http_persistent <var class="var">bool</var></samp></dt>
- <dd><p>Use persistent HTTP connections. Applicable only for HTTP output.
- </p>
- </dd>
- <dt><samp class="option">http_user_agent <var class="var">user_agent</var></samp></dt>
- <dd><p>Override User-Agent field in HTTP header. Applicable only for HTTP
- output.
- </p>
- </dd>
- <dt><samp class="option">ignore_io_errors <var class="var">bool</var></samp></dt>
- <dd><p>Ignore IO errors during open and write. Useful for long-duration runs
- with network output. This is disabled by default.
- </p>
- </dd>
- <dt><samp class="option">index_correction <var class="var">bool</var></samp></dt>
- <dd><p>Enable or disable segment index correction logic. Applicable only when
- <samp class="option">use_template</samp> is enabled and <samp class="option">use_timeline</samp> is
- disabled. This is disabled by default.
- </p>
- <p>When enabled, the logic monitors the flow of segment indexes. If a
- streams’s segment index value is not at the expected real time
- position, then the logic corrects that index value.
- </p>
- <p>Typically this logic is needed in live streaming use cases. The
- network bandwidth fluctuations are common during long run
- streaming. Each fluctuation can cause the segment indexes fall behind
- the expected real time position.
- </p>
- </dd>
- <dt><samp class="option">init_seg_name <var class="var">init_name</var></samp></dt>
- <dd><p>DASH-templated name to use for the initialization segment. Default is
- <code class="code">init-stream$RepresentationID$.$ext$</code>. <code class="code">$ext$</code> is replaced
- with the file name extension specific for the segment format.
- </p>
- </dd>
- <dt><samp class="option">ldash <var class="var">bool</var></samp></dt>
- <dd><p>Enable Low-latency Dash by constraining the presence and values of
- some elements. This is disabled by default.
- </p>
- </dd>
- <dt><samp class="option">lhls <var class="var">bool</var></samp></dt>
- <dd><p>Enable Low-latency HLS (LHLS). Add <code class="code">#EXT-X-PREFETCH</code> tag with
- current segment’s URI. hls.js player folks are trying to standardize
- an open LHLS spec. The draft spec is available at
- <a class="url" href="https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md">https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md</a>.
- </p>
- <p>This option tries to comply with the above open spec. It enables
- <samp class="option">streaming</samp> and <samp class="option">hls_playlist</samp> options automatically.
- This is an experimental feature.
- </p>
- <p>Note: This is not Apple’s version LHLS. See
- <a class="url" href="https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis">https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis</a>
- </p>
- </dd>
- <dt><samp class="option">master_m3u8_publish_rate <var class="var">segment_intervals_count</var></samp></dt>
- <dd><p>Publish master playlist repeatedly every after specified number of
- segment intervals.
- </p>
- </dd>
- <dt><samp class="option">max_playback_rate <var class="var">rate</var></samp></dt>
- <dd><p>Set the maximum playback rate indicated as appropriate for the
- purposes of automatically adjusting playback latency and buffer
- occupancy during normal playback by clients.
- </p>
- </dd>
- <dt><samp class="option">media_seg_name <var class="var">segment_name</var></samp></dt>
- <dd><p>DASH-templated name to use for the media segments. Default is
- <code class="code">chunk-stream$RepresentationID$-$Number%05d$.$ext$</code>. <code class="code">$ext$</code>
- is replaced with the file name extension specific for the segment
- format.
- </p>
- </dd>
- <dt><samp class="option">method <var class="var">method</var></samp></dt>
- <dd><p>Use the given HTTP method to create output files. Generally set to <code class="code">PUT</code>
- or <code class="code">POST</code>.
- </p>
- </dd>
- <dt><samp class="option">min_playback_rate <var class="var">rate</var></samp></dt>
- <dd><p>Set the minimum playback rate indicated as appropriate for the
- purposes of automatically adjusting playback latency and buffer
- occupancy during normal playback by clients.
- </p>
- </dd>
- <dt><samp class="option">mpd_profile <var class="var">flags</var></samp></dt>
- <dd><p>Set one or more MPD manifest profiles.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">dash</samp>’</dt>
- <dd><p>MPEG-DASH ISO Base media file format live profile
- </p></dd>
- <dt>‘<samp class="samp">dvb_dash</samp>’</dt>
- <dd><p>DVB-DASH profile
- </p></dd>
- </dl>
- <p>Default value is <code class="code">dash</code>.
- </p>
- </dd>
- <dt><samp class="option">remove_at_exit <var class="var">bool</var></samp></dt>
- <dd><p>Enable or disable removal of all segments when finished. This is
- disabled by default.
- </p>
- </dd>
- <dt><samp class="option">seg_duration <var class="var">duration</var></samp></dt>
- <dd><p>Set the segment length in seconds (fractional value can be set). The
- value is treated as average segment duration when the
- <samp class="option">use_template</samp> option is enabled and the <samp class="option">use_timeline</samp>
- option is disabled and as minimum segment duration for all the other
- use cases.
- </p>
- <p>Default value is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">single_file <var class="var">bool</var></samp></dt>
- <dd><p>Enable or disable storing all segments in one file, accessed using
- byte ranges. This is disabled by default.
- </p>
- <p>The name of the single file can be specified with the
- <samp class="option">single_file_name</samp> option, if not specified assume the basename
- of the manifest file with the output format extension.
- </p>
- </dd>
- <dt><samp class="option">single_file_name <var class="var">file_name</var></samp></dt>
- <dd><p>DASH-templated name to use for the manifest <code class="code">baseURL</code>
- element. Imply that the <samp class="option">single_file</samp> option is set to
- <var class="var">true</var>. In the template, <code class="code">$ext$</code> is replaced with the file
- name extension specific for the segment format.
- </p>
- </dd>
- <dt><samp class="option">streaming <var class="var">bool</var></samp></dt>
- <dd><p>Enable or disable chunk streaming mode of output. In chunk streaming
- mode, each frame will be a <code class="code">moof</code> fragment which forms a
- chunk. This is disabled by default.
- </p>
- </dd>
- <dt><samp class="option">target_latency <var class="var">target_latency</var></samp></dt>
- <dd><p>Set an intended target latency in seconds for serving (fractional
- value can be set). Applicable only when the <samp class="option">streaming</samp> and
- <samp class="option">write_prft</samp> options are enabled. This is an informative fields
- clients can use to measure the latency of the service.
- </p>
- </dd>
- <dt><samp class="option">timeout <var class="var">timeout</var></samp></dt>
- <dd><p>Set timeout for socket I/O operations expressed in seconds (fractional
- value can be set). Applicable only for HTTP output.
- </p>
- </dd>
- <dt><samp class="option">update_period <var class="var">period</var></samp></dt>
- <dd><p>Set the MPD update period, for dynamic content. The unit is
- second. If set to <code class="code">0</code>, the period is automatically computed.
- </p>
- <p>Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">use_template <var class="var">bool</var></samp></dt>
- <dd><p>Enable or disable use of <code class="code">SegmentTemplate</code> instead of
- <code class="code">SegmentList</code> in the manifest. This is enabled by default.
- </p>
- </dd>
- <dt><samp class="option">use_timeline <var class="var">bool</var></samp></dt>
- <dd><p>Enable or disable use of <code class="code">SegmentTimeline</code> within the
- <code class="code">SegmentTemplate</code> manifest section. This is enabled by default.
- </p>
- </dd>
- <dt><samp class="option">utc_timing_url <var class="var">url</var></samp></dt>
- <dd><p>URL of the page that will return the UTC timestamp in ISO
- format, for example <code class="code">https://time.akamai.com/?iso</code>
- </p>
- </dd>
- <dt><samp class="option">window_size <var class="var">size</var></samp></dt>
- <dd><p>Set the maximum number of segments kept in the manifest, discard the
- oldest one. This is useful for live streaming.
- </p>
- <p>If the value is <code class="code">0</code>, all segments are kept in the
- manifest. Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">write_prft <var class="var">write_prft</var></samp></dt>
- <dd><p>Write Producer Reference Time elements on supported streams. This also
- enables writing prft boxes in the underlying muxer. Applicable only
- when the <var class="var">utc_url</var> option is enabled. It is set to <var class="var">auto</var> by
- default, in which case the muxer will attempt to enable it only in
- modes that require it.
- </p></dd>
- </dl>
- <a name="Example"></a>
- <h4 class="subsection">21.29.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example" aria-hidden="true">TOC</a></span></h4>
- <p>Generate a DASH output reading from an input source in realtime using
- <code class="command">ffmpeg</code>.
- </p>
- <p>Two multimedia streams are generated from the input file, both
- containing a video stream encoded through ‘<samp class="samp">libx264</samp>’, and an audio
- stream encoded with ‘<samp class="samp">libfdk_aac</samp>’. The first multimedia stream
- contains video with a bitrate of 800k and audio at the default rate,
- the second with video scaled to 320x170 pixels at 300k and audio
- resampled at 22005 Hz.
- </p>
- <p>The <samp class="option">window_size</samp> option keeps only the latest 5 segments with
- the default duration of 5 seconds.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i <input> -map 0 -map 0 -c:a libfdk_aac -c:v libx264 \
- -b:v:0 800k -profile:v:0 main \
- -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline -ar:a:1 22050 \
- -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 \
- -use_timeline 1 -use_template 1 -window_size 5 \
- -adaptation_sets "id=0,streams=v id=1,streams=a" \
- -f dash /path/to/out.mpd
- </pre></div>
- <a name="daud"></a>
- <h3 class="section">21.30 daud<span class="pull-right"><a class="anchor hidden-xs" href="#daud" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-daud" aria-hidden="true">TOC</a></span></h3>
- <p>D-Cinema audio muxer.
- </p>
- <p>It accepts a single 6-channels audio stream resampled at 96000 Hz
- encoded with the ‘<samp class="samp">pcm_24daud</samp>’ codec.
- </p>
- <a name="Example-1"></a>
- <h4 class="subsection">21.30.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-1" aria-hidden="true">TOC</a></span></h4>
- <p>Use <code class="command">ffmpeg</code> to mux input audio to a ‘<samp class="samp">5.1</samp>’ channel layout
- resampled at 96000Hz:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -af aresample=96000,pan=5.1 slow.302
- </pre></div>
- <p>For ffmpeg versions before 7.0 you might have to use the ‘<samp class="samp">asetnsamples</samp>’
- filter to limit the muxed packet size, because this format does not support
- muxing packets larger than 65535 bytes (3640 samples). For newer ffmpeg
- versions audio is automatically packetized to 36000 byte (2000 sample) packets.
- </p>
- <a name="dv"></a>
- <h3 class="section">21.31 dv<span class="pull-right"><a class="anchor hidden-xs" href="#dv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dv" aria-hidden="true">TOC</a></span></h3>
- <p>DV (Digital Video) muxer.
- </p>
- <p>It accepts exactly one ‘<samp class="samp">dvvideo</samp>’ video stream and at most two
- ‘<samp class="samp">pcm_s16</samp>’ audio streams. More constraints are defined by the
- property of the video, which must correspond to a DV video supported
- profile, and on the framerate.
- </p>
- <a name="Example-2"></a>
- <h4 class="subsection">21.31.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-2" aria-hidden="true">TOC</a></span></h4>
- <p>Use <code class="command">ffmpeg</code> to convert the input:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -s:v 720x480 -pix_fmt yuv411p -r 29.97 -ac 2 -ar 48000 -y out.dv
- </pre></div>
- <a name="ffmetadata"></a>
- <h3 class="section">21.32 ffmetadata<span class="pull-right"><a class="anchor hidden-xs" href="#ffmetadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ffmetadata" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg metadata muxer.
- </p>
- <p>This muxer writes the streams metadata in the ‘<samp class="samp">ffmetadata</samp>’
- format.
- </p>
- <p>See <a data-manual="ffmpeg-formats" href="ffmpeg-formats.html#metadata">the Metadata chapter</a> for
- information about the format.
- </p>
- <a name="Example-3"></a>
- <h4 class="subsection">21.32.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-3" aria-hidden="true">TOC</a></span></h4>
- <p>Use <code class="command">ffmpeg</code> to extract metadata from an input file to a <samp class="file">metadata.ffmeta</samp>
- file in ‘<samp class="samp">ffmetadata</samp>’ format:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f ffmetadata metadata.ffmeta
- </pre></div>
- <a class="anchor" id="fifo"></a><a name="fifo-1"></a>
- <h3 class="section">21.33 fifo<span class="pull-right"><a class="anchor hidden-xs" href="#fifo-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fifo-1" aria-hidden="true">TOC</a></span></h3>
- <p>FIFO (First-In First-Out) muxer.
- </p>
- <p>The ‘<samp class="samp">fifo</samp>’ pseudo-muxer allows the separation of encoding and
- muxing by using a first-in-first-out queue and running the actual muxer
- in a separate thread.
- </p>
- <p>This is especially useful in combination with
- the <a class="ref" href="#tee">tee</a> muxer and can be used to send data to several
- destinations with different reliability/writing speed/latency.
- </p>
- <p>The target muxer is either selected from the output name or specified
- through the <samp class="option">fifo_format</samp> option.
- </p>
- <p>The behavior of the ‘<samp class="samp">fifo</samp>’ muxer if the queue fills up or if the
- output fails (e.g. if a packet cannot be written to the output) is
- selectable:
- </p><ul class="itemize mark-bullet">
- <li>Output can be transparently restarted with configurable delay between
- retries based on real time or time of the processed stream.
- </li><li>Encoding can be blocked during temporary failure, or continue transparently
- dropping packets in case the FIFO queue fills up.
- </li></ul>
- <p>API users should be aware that callback functions
- (<code class="code">interrupt_callback</code>, <code class="code">io_open</code> and <code class="code">io_close</code>) used
- within its <code class="code">AVFormatContext</code> must be thread-safe.
- </p>
- <a name="Options-78"></a>
- <h4 class="subsection">21.33.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-78" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-78" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">attempt_recovery <var class="var">bool</var></samp></dt>
- <dd><p>If failure occurs, attempt to recover the output. This is especially
- useful when used with network output, since it makes it possible to
- restart streaming transparently. By default this option is set to
- <code class="code">false</code>.
- </p>
- </dd>
- <dt><samp class="option">drop_pkts_on_overflow <var class="var">bool</var></samp></dt>
- <dd><p>If set to <code class="code">true</code>, in case the fifo queue fills up, packets will
- be dropped rather than blocking the encoder. This makes it possible to
- continue streaming without delaying the input, at the cost of omitting
- part of the stream. By default this option is set to <code class="code">false</code>, so in
- such cases the encoder will be blocked until the muxer processes some
- of the packets and none of them is lost.
- </p>
- </dd>
- <dt><samp class="option">fifo_format <var class="var">format_name</var></samp></dt>
- <dd><p>Specify the format name. Useful if it cannot be guessed from the
- output name suffix.
- </p>
- </dd>
- <dt><samp class="option">format_opts <var class="var">options</var></samp></dt>
- <dd><p>Specify format options for the underlying muxer. Muxer options can be
- specified as a list of <var class="var">key</var>=<var class="var">value</var> pairs separated by ’:’.
- </p>
- </dd>
- <dt><samp class="option">max_recovery_attempts <var class="var">count</var></samp></dt>
- <dd><p>Set maximum number of successive unsuccessful recovery attempts after
- which the output fails permanently. By default this option is set to
- <code class="code">0</code> (unlimited).
- </p>
- </dd>
- <dt><samp class="option">queue_size <var class="var">size</var></samp></dt>
- <dd><p>Specify size of the queue as a number of packets. Default value is
- <code class="code">60</code>.
- </p>
- </dd>
- <dt><samp class="option">recover_any_error <var class="var">bool</var></samp></dt>
- <dd><p>If set to <code class="code">true</code>, recovery will be attempted regardless of type
- of the error causing the failure. By default this option is set to
- <code class="code">false</code> and in case of certain (usually permanent) errors the
- recovery is not attempted even when the <samp class="option">attempt_recovery</samp>
- option is set to <code class="code">true</code>.
- </p>
- </dd>
- <dt><samp class="option">recovery_wait_streamtime <var class="var">bool</var></samp></dt>
- <dd><p>If set to <code class="code">false</code>, the real time is used when waiting for the
- recovery attempt (i.e. the recovery will be attempted after the time
- specified by the <samp class="option">recovery_wait_time</samp> option).
- </p>
- <p>If set to <code class="code">true</code>, the time of the processed stream is taken into
- account instead (i.e. the recovery will be attempted after discarding
- the packets corresponding to the <samp class="option">recovery_wait_time</samp> option).
- </p>
- <p>By default this option is set to <code class="code">false</code>.
- </p>
- </dd>
- <dt><samp class="option">recovery_wait_time <var class="var">duration</var></samp></dt>
- <dd><p>Specify waiting time in seconds before the next recovery attempt after
- previous unsuccessful recovery attempt. Default value is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">restart_with_keyframe <var class="var">bool</var></samp></dt>
- <dd><p>Specify whether to wait for the keyframe after recovering from
- queue overflow or failure. This option is set to <code class="code">false</code> by default.
- </p>
- </dd>
- <dt><samp class="option">timeshift <var class="var">duration</var></samp></dt>
- <dd><p>Buffer the specified amount of packets and delay writing the
- output. Note that the value of the <samp class="option">queue_size</samp> option must be
- big enough to store the packets for timeshift. At the end of the input
- the fifo buffer is flushed at realtime speed.
- </p></dd>
- </dl>
- <a name="Example-4"></a>
- <h4 class="subsection">21.33.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-4" aria-hidden="true">TOC</a></span></h4>
- <p>Use <code class="command">ffmpeg</code> to stream to an RTMP server, continue processing
- the stream at real-time rate even in case of temporary failure
- (network outage) and attempt to recover streaming every second
- indefinitely:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format flv \
- -drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 \
- -map 0:v -map 0:a rtmp://example.com/live/stream_name
- </pre></div>
- <a name="film_005fcpk"></a>
- <h3 class="section">21.34 film_cpk<span class="pull-right"><a class="anchor hidden-xs" href="#film_005fcpk" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-film_005fcpk" aria-hidden="true">TOC</a></span></h3>
- <p>Sega film (.cpk) muxer.
- </p>
- <p>This format was used as internal format for several Sega games.
- </p>
- <p>For more information regarding the Sega film file format, visit
- <a class="url" href="http://wiki.multimedia.cx/index.php?title=Sega_FILM">http://wiki.multimedia.cx/index.php?title=Sega_FILM</a>.
- </p>
- <p>It accepts at maximum one ‘<samp class="samp">cinepak</samp>’ or raw video stream, and at
- maximum one audio stream.
- </p>
- <a name="filmstrip"></a>
- <h3 class="section">21.35 filmstrip<span class="pull-right"><a class="anchor hidden-xs" href="#filmstrip" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-filmstrip" aria-hidden="true">TOC</a></span></h3>
- <p>Adobe Filmstrip muxer.
- </p>
- <p>This format is used by several Adobe tools to store a generated filmstrip export. It
- accepts a single raw video stream.
- </p>
- <a name="fits"></a>
- <h3 class="section">21.36 fits<span class="pull-right"><a class="anchor hidden-xs" href="#fits" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fits" aria-hidden="true">TOC</a></span></h3>
- <p>Flexible Image Transport System (FITS) muxer.
- </p>
- <p>This image format is used to store astronomical data.
- </p>
- <p>For more information regarding the format, visit
- <a class="url" href="https://fits.gsfc.nasa.gov">https://fits.gsfc.nasa.gov</a>.
- </p>
- <a name="flac-3"></a>
- <h3 class="section">21.37 flac<span class="pull-right"><a class="anchor hidden-xs" href="#flac-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flac-3" aria-hidden="true">TOC</a></span></h3>
- <p>Raw FLAC audio muxer.
- </p>
- <p>This muxer accepts exactly one FLAC audio stream. Additionally, it is possible to add
- images with disposition ‘<samp class="samp">attached_pic</samp>’.
- </p>
- <a name="Options-79"></a>
- <h4 class="subsection">21.37.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-79" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-79" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">write_header <var class="var">bool</var></samp></dt>
- <dd><p>write the file header if set to <code class="code">true</code>, default is <code class="code">true</code>
- </p></dd>
- </dl>
- <a name="Example-5"></a>
- <h4 class="subsection">21.37.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-5" aria-hidden="true">TOC</a></span></h4>
- <p>Use <code class="command">ffmpeg</code> to store the audio stream from an input file,
- together with several pictures used with ‘<samp class="samp">attached_pic</samp>’
- disposition:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -i pic1.png -i pic2.jpg -map 0:a -map 1 -map 2 -disposition:v attached_pic OUTPUT
- </pre></div>
- <a name="flv"></a>
- <h3 class="section">21.38 flv<span class="pull-right"><a class="anchor hidden-xs" href="#flv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flv" aria-hidden="true">TOC</a></span></h3>
- <p>Adobe Flash Video Format muxer.
- </p>
- <a name="Options-80"></a>
- <h4 class="subsection">21.38.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-80" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-80" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">flvflags <var class="var">flags</var></samp></dt>
- <dd><p>Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">aac_seq_header_detect</samp>’</dt>
- <dd><p>Place AAC sequence header based on audio stream data.
- </p>
- </dd>
- <dt>‘<samp class="samp">no_sequence_end</samp>’</dt>
- <dd><p>Disable sequence end tag.
- </p>
- </dd>
- <dt>‘<samp class="samp">no_metadata</samp>’</dt>
- <dd><p>Disable metadata tag.
- </p>
- </dd>
- <dt>‘<samp class="samp">no_duration_filesize</samp>’</dt>
- <dd><p>Disable duration and filesize in metadata when they are equal to zero
- at the end of stream. (Be used to non-seekable living stream).
- </p>
- </dd>
- <dt>‘<samp class="samp">add_keyframe_index</samp>’</dt>
- <dd><p>Used to facilitate seeking; particularly for HTTP pseudo streaming.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="framecrc"></a><a name="framecrc-1"></a>
- <h3 class="section">21.39 framecrc<span class="pull-right"><a class="anchor hidden-xs" href="#framecrc-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-framecrc-1" aria-hidden="true">TOC</a></span></h3>
- <p>Per-packet CRC (Cyclic Redundancy Check) testing format.
- </p>
- <p>This muxer computes and prints the Adler-32 CRC for each audio
- and video packet. By default audio frames are converted to signed
- 16-bit raw audio and video frames to raw video before computing the
- CRC.
- </p>
- <p>The output of the muxer consists of a line for each audio and video
- packet of the form:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">stream_index</var>, <var class="var">packet_dts</var>, <var class="var">packet_pts</var>, <var class="var">packet_duration</var>, <var class="var">packet_size</var>, 0x<var class="var">CRC</var>
- </pre></div>
- <p><var class="var">CRC</var> is a hexadecimal number 0-padded to 8 digits containing the
- CRC of the packet.
- </p>
- <a name="Examples-17"></a>
- <h4 class="subsection">21.39.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-17" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-17" aria-hidden="true">TOC</a></span></h4>
- <p>For example to compute the CRC of the audio and video frames in
- <samp class="file">INPUT</samp>, converted to raw audio and video packets, and store it
- in the file <samp class="file">out.crc</samp>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f framecrc out.crc
- </pre></div>
- <p>To print the information to stdout, use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f framecrc -
- </pre></div>
- <p>With <code class="command">ffmpeg</code>, you can select the output format to which the
- audio and video frames are encoded before computing the CRC for each
- packet by specifying the audio and video codec. For example, to
- compute the CRC of each decoded input audio frame converted to PCM
- unsigned 8-bit and of each decoded input video frame converted to
- MPEG-2 video, use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
- </pre></div>
- <p>See also the <a class="ref" href="#crc">crc</a> muxer.
- </p>
- <a class="anchor" id="framehash"></a><a name="framehash-1"></a>
- <h3 class="section">21.40 framehash<span class="pull-right"><a class="anchor hidden-xs" href="#framehash-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-framehash-1" aria-hidden="true">TOC</a></span></h3>
- <p>Per-packet hash testing format.
- </p>
- <p>This muxer computes and prints a cryptographic hash for each audio
- and video packet. This can be used for packet-by-packet equality
- checks without having to individually do a binary comparison on each.
- </p>
- <p>By default audio frames are converted to signed 16-bit raw audio and
- video frames to raw video before computing the hash, but the output
- of explicit conversions to other codecs can also be used. It uses the
- SHA-256 cryptographic hash function by default, but supports several
- other algorithms.
- </p>
- <p>The output of the muxer consists of a line for each audio and video
- packet of the form:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">stream_index</var>, <var class="var">packet_dts</var>, <var class="var">packet_pts</var>, <var class="var">packet_duration</var>, <var class="var">packet_size</var>, <var class="var">hash</var>
- </pre></div>
- <p><var class="var">hash</var> is a hexadecimal number representing the computed hash
- for the packet.
- </p>
- <dl class="table">
- <dt><samp class="option">hash <var class="var">algorithm</var></samp></dt>
- <dd><p>Use the cryptographic hash function specified by the string <var class="var">algorithm</var>.
- Supported values include <code class="code">MD5</code>, <code class="code">murmur3</code>, <code class="code">RIPEMD128</code>,
- <code class="code">RIPEMD160</code>, <code class="code">RIPEMD256</code>, <code class="code">RIPEMD320</code>, <code class="code">SHA160</code>,
- <code class="code">SHA224</code>, <code class="code">SHA256</code> (default), <code class="code">SHA512/224</code>, <code class="code">SHA512/256</code>,
- <code class="code">SHA384</code>, <code class="code">SHA512</code>, <code class="code">CRC32</code> and <code class="code">adler32</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-18"></a>
- <h4 class="subsection">21.40.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-18" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-18" aria-hidden="true">TOC</a></span></h4>
- <p>To compute the SHA-256 hash of the audio and video frames in <samp class="file">INPUT</samp>,
- converted to raw audio and video packets, and store it in the file
- <samp class="file">out.sha256</samp>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f framehash out.sha256
- </pre></div>
- <p>To print the information to stdout, using the MD5 hash function, use
- the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f framehash -hash md5 -
- </pre></div>
- <p>See also the <a class="ref" href="#hash">hash</a> muxer.
- </p>
- <a class="anchor" id="framemd5"></a><a name="framemd5-1"></a>
- <h3 class="section">21.41 framemd5<span class="pull-right"><a class="anchor hidden-xs" href="#framemd5-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-framemd5-1" aria-hidden="true">TOC</a></span></h3>
- <p>Per-packet MD5 testing format.
- </p>
- <p>This is a variant of the <a class="ref" href="#framehash">framehash</a> muxer. Unlike that muxer,
- it defaults to using the MD5 hash function.
- </p>
- <a name="Examples-19"></a>
- <h4 class="subsection">21.41.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-19" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-19" aria-hidden="true">TOC</a></span></h4>
- <p>To compute the MD5 hash of the audio and video frames in <samp class="file">INPUT</samp>,
- converted to raw audio and video packets, and store it in the file
- <samp class="file">out.md5</samp>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f framemd5 out.md5
- </pre></div>
- <p>To print the information to stdout, use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f framemd5 -
- </pre></div>
- <p>See also the <a class="ref" href="#framehash">framehash</a> and <a class="ref" href="#md5">md5</a> muxers.
- </p>
- <a class="anchor" id="gif"></a><a name="gif-2"></a>
- <h3 class="section">21.42 gif<span class="pull-right"><a class="anchor hidden-xs" href="#gif-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gif-2" aria-hidden="true">TOC</a></span></h3>
- <p>Animated GIF muxer.
- </p>
- <p>Note that the GIF format has a very large time base: the delay between two frames can
- therefore not be smaller than one centi second.
- </p>
- <a name="Options-81"></a>
- <h4 class="subsection">21.42.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-81" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-81" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">loop <var class="var">bool</var></samp></dt>
- <dd><p>Set the number of times to loop the output. Use <code class="code">-1</code> for no loop, <code class="code">0</code>
- for looping indefinitely (default).
- </p>
- </dd>
- <dt><samp class="option">final_delay <var class="var">delay</var></samp></dt>
- <dd><p>Force the delay (expressed in centiseconds) after the last frame. Each frame
- ends with a delay until the next frame. The default is <code class="code">-1</code>, which is a
- special value to tell the muxer to reuse the previous delay. In case of a
- loop, you might want to customize this value to mark a pause for instance.
- </p></dd>
- </dl>
- <a name="Example-6"></a>
- <h4 class="subsection">21.42.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-6" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-6" aria-hidden="true">TOC</a></span></h4>
- <p>Encode a gif looping 10 times, with a 5 seconds delay between
- the loops:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -loop 10 -final_delay 500 out.gif
- </pre></div>
- <p>Note 1: if you wish to extract the frames into separate GIF files, you need to
- force the <a class="ref" href="#image2">image2</a> muxer:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v gif -f image2 "out%d.gif"
- </pre></div>
- <a name="gxf"></a>
- <h3 class="section">21.43 gxf<span class="pull-right"><a class="anchor hidden-xs" href="#gxf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gxf" aria-hidden="true">TOC</a></span></h3>
- <p>General eXchange Format (GXF) muxer.
- </p>
- <p>GXF was developed by Grass Valley Group, then standardized by SMPTE as SMPTE
- 360M and was extended in SMPTE RDD 14-2007 to include high-definition video
- resolutions.
- </p>
- <p>It accepts at most one video stream with codec ‘<samp class="samp">mjpeg</samp>’, or
- ‘<samp class="samp">mpeg1video</samp>’, or ‘<samp class="samp">mpeg2video</samp>’, or ‘<samp class="samp">dvvideo</samp>’ with resolution
- ‘<samp class="samp">512x480</samp>’ or ‘<samp class="samp">608x576</samp>’, and several audio streams with rate 48000Hz
- and codec ‘<samp class="samp">pcm16_le</samp>’.
- </p>
- <a class="anchor" id="hash"></a><a name="hash-1"></a>
- <h3 class="section">21.44 hash<span class="pull-right"><a class="anchor hidden-xs" href="#hash-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hash-1" aria-hidden="true">TOC</a></span></h3>
- <p>Hash testing format.
- </p>
- <p>This muxer computes and prints a cryptographic hash of all the input
- audio and video frames. This can be used for equality checks without
- having to do a complete binary comparison.
- </p>
- <p>By default audio frames are converted to signed 16-bit raw audio and
- video frames to raw video before computing the hash, but the output
- of explicit conversions to other codecs can also be used. Timestamps
- are ignored. It uses the SHA-256 cryptographic hash function by default,
- but supports several other algorithms.
- </p>
- <p>The output of the muxer consists of a single line of the form:
- <var class="var">algo</var>=<var class="var">hash</var>, where <var class="var">algo</var> is a short string representing
- the hash function used, and <var class="var">hash</var> is a hexadecimal number
- representing the computed hash.
- </p>
- <dl class="table">
- <dt><samp class="option">hash <var class="var">algorithm</var></samp></dt>
- <dd><p>Use the cryptographic hash function specified by the string <var class="var">algorithm</var>.
- Supported values include <code class="code">MD5</code>, <code class="code">murmur3</code>, <code class="code">RIPEMD128</code>,
- <code class="code">RIPEMD160</code>, <code class="code">RIPEMD256</code>, <code class="code">RIPEMD320</code>, <code class="code">SHA160</code>,
- <code class="code">SHA224</code>, <code class="code">SHA256</code> (default), <code class="code">SHA512/224</code>, <code class="code">SHA512/256</code>,
- <code class="code">SHA384</code>, <code class="code">SHA512</code>, <code class="code">CRC32</code> and <code class="code">adler32</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-20"></a>
- <h4 class="subsection">21.44.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-20" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-20" aria-hidden="true">TOC</a></span></h4>
- <p>To compute the SHA-256 hash of the input converted to raw audio and
- video, and store it in the file <samp class="file">out.sha256</samp>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f hash out.sha256
- </pre></div>
- <p>To print an MD5 hash to stdout use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f hash -hash md5 -
- </pre></div>
- <p>See also the <a class="ref" href="#framehash">framehash</a> muxer.
- </p>
- <a class="anchor" id="hds"></a><a name="hds-1"></a>
- <h3 class="section">21.45 hds<span class="pull-right"><a class="anchor hidden-xs" href="#hds-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hds-1" aria-hidden="true">TOC</a></span></h3>
- <p>HTTP Dynamic Streaming (HDS) muxer.
- </p>
- <p>HTTP dynamic streaming, or HDS, is an adaptive bitrate streaming method
- developed by Adobe. HDS delivers MP4 video content over HTTP connections. HDS
- can be used for on-demand streaming or live streaming.
- </p>
- <p>This muxer creates an .f4m (Adobe Flash Media Manifest File) manifest, an .abst
- (Adobe Bootstrap File) for each stream, and segment files in a directory
- specified as the output.
- </p>
- <p>These needs to be accessed by an HDS player through HTTPS for it to be able to
- perform playback on the generated stream.
- </p>
- <a name="Options-82"></a>
- <h4 class="subsection">21.45.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-82" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-82" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">extra_window_size <var class="var">int</var></samp></dt>
- <dd><p>number of fragments kept outside of the manifest before removing from disk
- </p>
- </dd>
- <dt><samp class="option">min_frag_duration <var class="var">microseconds</var></samp></dt>
- <dd><p>minimum fragment duration (in microseconds), default value is 1 second
- (<code class="code">10000000</code>)
- </p>
- </dd>
- <dt><samp class="option">remove_at_exit <var class="var">bool</var></samp></dt>
- <dd><p>remove all fragments when finished when set to <code class="code">true</code>
- </p>
- </dd>
- <dt><samp class="option">window_size <var class="var">int</var></samp></dt>
- <dd><p>number of fragments kept in the manifest, if set to a value different from
- <code class="code">0</code>. By default all segments are kept in the output directory.
- </p></dd>
- </dl>
- <a name="Example-7"></a>
- <h4 class="subsection">21.45.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-7" aria-hidden="true">TOC</a></span></h4>
- <p>Use <code class="command">ffmpeg</code> to generate HDS files to the <samp class="file">output.hds</samp> directory in
- real-time rate:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i INPUT -f hds -b:v 200k output.hds
- </pre></div>
- <a class="anchor" id="hls"></a><a name="hls-2"></a>
- <h3 class="section">21.46 hls<span class="pull-right"><a class="anchor hidden-xs" href="#hls-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hls-2" aria-hidden="true">TOC</a></span></h3>
- <p>Apple HTTP Live Streaming muxer that segments MPEG-TS according to
- the HTTP Live Streaming (HLS) specification.
- </p>
- <p>It creates a playlist file, and one or more segment files. The output filename
- specifies the playlist filename.
- </p>
- <p>By default, the muxer creates a file for each segment produced. These files
- have the same name as the playlist, followed by a sequential number and a
- .ts extension.
- </p>
- <p>Make sure to require a closed GOP when encoding and to set the GOP
- size to fit your segment time constraint.
- </p>
- <p>For example, to convert an input file with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -c:v h264 -flags +cgop -g 30 -hls_time 1 out.m3u8
- </pre></div>
- <p>This example will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
- <samp class="file">out0.ts</samp>, <samp class="file">out1.ts</samp>, <samp class="file">out2.ts</samp>, etc.
- </p>
- <p>See also the <a class="ref" href="#segment">segment</a> muxer, which provides a more generic and
- flexible implementation of a segmenter, and can be used to perform HLS
- segmentation.
- </p>
- <a name="Options-83"></a>
- <h4 class="subsection">21.46.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-83" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-83" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">hls_init_time <var class="var">duration</var></samp></dt>
- <dd><p>Set the initial target segment length. Default value is <var class="var">0</var>.
- </p>
- <p><var class="var">duration</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>Segment will be cut on the next key frame after this time has passed on the
- first m3u8 list. After the initial playlist is filled, <code class="command">ffmpeg</code> will cut
- segments at duration equal to <samp class="option">hls_time</samp>.
- </p>
- </dd>
- <dt><samp class="option">hls_time <var class="var">duration</var></samp></dt>
- <dd><p>Set the target segment length. Default value is 2.
- </p>
- <p><var class="var">duration</var> must be a time duration specification,
- see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- Segment will be cut on the next key frame after this time has passed.
- </p>
- </dd>
- <dt><samp class="option">hls_list_size <var class="var">size</var></samp></dt>
- <dd><p>Set the maximum number of playlist entries. If set to 0 the list file
- will contain all the segments. Default value is 5.
- </p>
- </dd>
- <dt><samp class="option">hls_delete_threshold <var class="var">size</var></samp></dt>
- <dd><p>Set the number of unreferenced segments to keep on disk before <code class="code">hls_flags delete_segments</code>
- deletes them. Increase this to allow continue clients to download segments which
- were recently referenced in the playlist. Default value is 1, meaning segments older than
- <samp class="option">hls_list_size+1</samp> will be deleted.
- </p>
- </dd>
- <dt><samp class="option">hls_start_number_source <var class="var">source</var></samp></dt>
- <dd><p>Start the playlist sequence number (<code class="code">#EXT-X-MEDIA-SEQUENCE</code>) according to the specified source.
- Unless <samp class="option">hls_flags single_file</samp> is set, it also specifies source of starting sequence numbers of
- segment and subtitle filenames. In any case, if <samp class="option">hls_flags append_list</samp>
- is set and read playlist sequence number is greater than the specified start sequence number,
- then that value will be used as start value.
- </p>
- <p>It accepts the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">generic (default)</samp></dt>
- <dd><p>Set the start numbers according to the <samp class="option">start_number</samp> option value.
- </p>
- </dd>
- <dt><samp class="option">epoch</samp></dt>
- <dd><p>Set the start number as the seconds since epoch (1970-01-01 00:00:00).
- </p>
- </dd>
- <dt><samp class="option">epoch_us</samp></dt>
- <dd><p>Set the start number as the microseconds since epoch (1970-01-01 00:00:00).
- </p>
- </dd>
- <dt><samp class="option">datetime</samp></dt>
- <dd><p>Set the start number based on the current date/time as YYYYmmddHHMMSS. e.g. 20161231235759.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">start_number <var class="var">number</var></samp></dt>
- <dd><p>Start the playlist sequence number (<code class="code">#EXT-X-MEDIA-SEQUENCE</code>) from the specified <var class="var">number</var>
- when <samp class="option">hls_start_number_source</samp> value is <var class="var">generic</var>. (This is the default case.)
- Unless <samp class="option">hls_flags single_file</samp> is set, it also specifies starting sequence numbers of segment and subtitle filenames.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">hls_allow_cache <var class="var">bool</var></samp></dt>
- <dd><p>Explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments.
- </p>
- </dd>
- <dt><samp class="option">hls_base_url <var class="var">baseurl</var></samp></dt>
- <dd><p>Append <var class="var">baseurl</var> to every entry in the playlist.
- Useful to generate playlists with absolute paths.
- </p>
- <p>Note that the playlist sequence number must be unique for each segment
- and it is not to be confused with the segment filename sequence number
- which can be cyclic, for example if the <samp class="option">wrap</samp> option is
- specified.
- </p>
- </dd>
- <dt><samp class="option">hls_segment_filename <var class="var">filename</var></samp></dt>
- <dd><p>Set the segment filename. Unless the <samp class="option">hls_flags</samp> option is set with
- ‘<samp class="samp">single_file</samp>’, <var class="var">filename</var> is used as a string format with the
- segment number appended.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts' out.m3u8
- </pre></div>
- <p>will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
- <samp class="file">file000.ts</samp>, <samp class="file">file001.ts</samp>, <samp class="file">file002.ts</samp>, etc.
- </p>
- <p><var class="var">filename</var> may contain a full path or relative path specification,
- but only the file name part without any path will be contained in the m3u8 segment list.
- Should a relative path be specified, the path of the created segment
- files will be relative to the current working directory.
- When <samp class="option">strftime_mkdir</samp> is set, the whole expanded value of <var class="var">filename</var> will be written into the m3u8 segment list.
- </p>
- <p>When <samp class="option">var_stream_map</samp> is set with two or more variant streams, the
- <var class="var">filename</var> pattern must contain the string "%v", and this string will be
- expanded to the position of variant stream index in the generated segment file
- names.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
- -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
- -hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8
- </pre></div>
- <p>will produce the playlists segment file sets:
- <samp class="file">file_0_000.ts</samp>, <samp class="file">file_0_001.ts</samp>, <samp class="file">file_0_002.ts</samp>, etc. and
- <samp class="file">file_1_000.ts</samp>, <samp class="file">file_1_001.ts</samp>, <samp class="file">file_1_002.ts</samp>, etc.
- </p>
- <p>The string "%v" may be present in the filename or in the last directory name
- containing the file, but only in one of them. (Additionally, %v may appear multiple times in the last
- sub-directory or filename.) If the string %v is present in the directory name, then
- sub-directories are created after expanding the directory name pattern. This
- enables creation of segments corresponding to different variant streams in
- subdirectories.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
- -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
- -hls_segment_filename 'vs%v/file_%03d.ts' vs%v/out.m3u8
- </pre></div>
- <p>will produce the playlists segment file sets:
- <samp class="file">vs0/file_000.ts</samp>, <samp class="file">vs0/file_001.ts</samp>, <samp class="file">vs0/file_002.ts</samp>, etc. and
- <samp class="file">vs1/file_000.ts</samp>, <samp class="file">vs1/file_001.ts</samp>, <samp class="file">vs1/file_002.ts</samp>, etc.
- </p>
- </dd>
- <dt><samp class="option">strftime <var class="var">bool</var></samp></dt>
- <dd><p>Use <code class="code">strftime()</code> on <var class="var">filename</var> to expand the segment filename with
- localtime. The segment number is also available in this mode, but to use it,
- you need to set ‘<samp class="samp">second_level_segment_index</samp>’ in the <samp class="option">hls_flag</samp> and
- %%d will be the specifier.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8
- </pre></div>
- <p>will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
- <samp class="file">file-20160215-1455569023.ts</samp>, <samp class="file">file-20160215-1455569024.ts</samp>, etc.
- Note: On some systems/environments, the <code class="code">%s</code> specifier is not
- available. See <code class="code">strftime()</code> documentation.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -hls_flags second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts' out.m3u8
- </pre></div>
- <p>will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
- <samp class="file">file-20160215-0001.ts</samp>, <samp class="file">file-20160215-0002.ts</samp>, etc.
- </p>
- </dd>
- <dt><samp class="option">strftime_mkdir <var class="var">bool</var></samp></dt>
- <dd><p>Used together with <samp class="option">strftime</samp>, it will create all subdirectories which
- are present in the expanded values of option <samp class="option">hls_segment_filename</samp>.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8
- </pre></div>
- <p>will create a directory <samp class="file">201560215</samp> (if it does not exist), and then
- produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
- <samp class="file">20160215/file-20160215-1455569023.ts</samp>,
- <samp class="file">20160215/file-20160215-1455569024.ts</samp>, etc.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8
- </pre></div>
- <p>will create a directory hierarchy <samp class="file">2016/02/15</samp> (if any of them do not
- exist), and then produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
- <samp class="file">2016/02/15/file-20160215-1455569023.ts</samp>,
- <samp class="file">2016/02/15/file-20160215-1455569024.ts</samp>, etc.
- </p>
- </dd>
- <dt><samp class="option">hls_segment_options <var class="var">options_list</var></samp></dt>
- <dd><p>Set output format options using a :-separated list of key=value
- parameters. Values containing <code class="code">:</code> special characters must be
- escaped.
- </p>
- </dd>
- <dt><samp class="option">hls_key_info_file <var class="var">key_info_file</var></samp></dt>
- <dd><p>Use the information in <var class="var">key_info_file</var> for segment encryption. The first
- line of <var class="var">key_info_file</var> specifies the key URI written to the playlist. The
- key URL is used to access the encryption key during playback. The second line
- specifies the path to the key file used to obtain the key during the encryption
- process. The key file is read as a single packed array of 16 octets in binary
- format. The optional third line specifies the initialization vector (IV) as a
- hexadecimal string to be used instead of the segment sequence number (default)
- for encryption. Changes to <var class="var">key_info_file</var> will result in segment
- encryption with the new key/IV and an entry in the playlist for the new key
- URI/IV if <samp class="option">hls_flags periodic_rekey</samp> is enabled.
- </p>
- <p>Key info file format:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">key URI</var>
- <var class="var">key file path</var>
- <var class="var">IV</var> (optional)
- </pre></div>
- <p>Example key URIs:
- </p><div class="example">
- <pre class="example-preformatted">http://server/file.key
- /path/to/file.key
- file.key
- </pre></div>
- <p>Example key file paths:
- </p><div class="example">
- <pre class="example-preformatted">file.key
- /path/to/file.key
- </pre></div>
- <p>Example IV:
- </p><div class="example">
- <pre class="example-preformatted">0123456789ABCDEF0123456789ABCDEF
- </pre></div>
- <p>Key info file example:
- </p><div class="example">
- <pre class="example-preformatted">http://server/file.key
- /path/to/file.key
- 0123456789ABCDEF0123456789ABCDEF
- </pre></div>
- <p>Example shell script:
- </p><div class="example">
- <pre class="example-preformatted">#!/bin/sh
- BASE_URL=${1:-'.'}
- openssl rand 16 > file.key
- echo $BASE_URL/file.key > file.keyinfo
- echo file.key >> file.keyinfo
- echo $(openssl rand -hex 16) >> file.keyinfo
- ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
- -hls_key_info_file file.keyinfo out.m3u8
- </pre></div>
- </dd>
- <dt><samp class="option">hls_enc <var class="var">bool</var></samp></dt>
- <dd><p>Enable (1) or disable (0) the AES128 encryption.
- When enabled every segment generated is encrypted and the encryption key
- is saved as <var class="var">playlist name</var>.key.
- </p>
- </dd>
- <dt><samp class="option">hls_enc_key <var class="var">key</var></samp></dt>
- <dd><p>Specify a 16-octet key to encrypt the segments, by default it is randomly
- generated.
- </p>
- </dd>
- <dt><samp class="option">hls_enc_key_url <var class="var">keyurl</var></samp></dt>
- <dd><p>If set, <var class="var">keyurl</var> is prepended instead of <var class="var">baseurl</var> to the key filename
- in the playlist.
- </p>
- </dd>
- <dt><samp class="option">hls_enc_iv <var class="var">iv</var></samp></dt>
- <dd><p>Specify the 16-octet initialization vector for every segment instead of the
- autogenerated ones.
- </p>
- </dd>
- <dt><samp class="option">hls_segment_type <var class="var">flags</var></samp></dt>
- <dd><p>Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">mpegts</samp>’</dt>
- <dd><p>Output segment files in MPEG-2 Transport Stream format. This is
- compatible with all HLS versions.
- </p>
- </dd>
- <dt>‘<samp class="samp">fmp4</samp>’</dt>
- <dd><p>Output segment files in fragmented MP4 format, similar to MPEG-DASH.
- fmp4 files may be used in HLS version 7 and above.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">hls_fmp4_init_filename <var class="var">filename</var></samp></dt>
- <dd><p>Set filename for the fragment files header file, default filename is <samp class="file">init.mp4</samp>.
- </p>
- <p>When <samp class="option">strftime</samp> is enabled, <var class="var">filename</var> is expanded to the segment filename with localtime.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -hls_segment_type fmp4 -strftime 1 -hls_fmp4_init_filename "%s_init.mp4" out.m3u8
- </pre></div>
- <p>will produce init like this <samp class="file">1602678741_init.mp4</samp>.
- </p>
- </dd>
- <dt><samp class="option">hls_fmp4_init_resend <var class="var">bool</var></samp></dt>
- <dd><p>Resend init file after m3u8 file refresh every time, default is <var class="var">0</var>.
- </p>
- <p>When <samp class="option">var_stream_map</samp> is set with two or more variant streams, the
- <var class="var">filename</var> pattern must contain the string "%v", this string specifies
- the position of variant stream index in the generated init file names.
- The string "%v" may be present in the filename or in the last directory name
- containing the file. If the string is present in the directory name, then
- sub-directories are created after expanding the directory name pattern. This
- enables creation of init files corresponding to different variant streams in
- subdirectories.
- </p>
- </dd>
- <dt><samp class="option">hls_flags <var class="var">flags</var></samp></dt>
- <dd><p>Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">single_file</samp>’</dt>
- <dd><p>If this flag is set, the muxer will store all segments in a single MPEG-TS
- file, and will use byte ranges in the playlist. HLS playlists generated with
- this way will have the version number 4.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.nut -hls_flags single_file out.m3u8
- </pre></div>
- <p>will produce the playlist, <samp class="file">out.m3u8</samp>, and a single segment file,
- <samp class="file">out.ts</samp>.
- </p>
- </dd>
- <dt>‘<samp class="samp">delete_segments</samp>’</dt>
- <dd><p>Segment files removed from the playlist are deleted after a period of time
- equal to the duration of the segment plus the duration of the playlist.
- </p>
- </dd>
- <dt>‘<samp class="samp">append_list</samp>’</dt>
- <dd><p>Append new segments into the end of old segment list,
- and remove the <code class="code">#EXT-X-ENDLIST</code> from the old segment list.
- </p>
- </dd>
- <dt>‘<samp class="samp">round_durations</samp>’</dt>
- <dd><p>Round the duration info in the playlist file segment info to integer
- values, instead of using floating point.
- If there are no other features requiring higher HLS versions be used,
- then this will allow <code class="command">ffmpeg</code> to output a HLS version 2 m3u8.
- </p>
- </dd>
- <dt>‘<samp class="samp">discont_start</samp>’</dt>
- <dd><p>Add the <code class="code">#EXT-X-DISCONTINUITY</code> tag to the playlist, before the
- first segment’s information.
- </p>
- </dd>
- <dt>‘<samp class="samp">omit_endlist</samp>’</dt>
- <dd><p>Do not append the <code class="code">EXT-X-ENDLIST</code> tag at the end of the playlist.
- </p>
- </dd>
- <dt>‘<samp class="samp">periodic_rekey</samp>’</dt>
- <dd><p>The file specified by <code class="code">hls_key_info_file</code> will be checked periodically and
- detect updates to the encryption info. Be sure to replace this file atomically,
- including the file containing the AES encryption key.
- </p>
- </dd>
- <dt>‘<samp class="samp">independent_segments</samp>’</dt>
- <dd><p>Add the <code class="code">#EXT-X-INDEPENDENT-SEGMENTS</code> tag to playlists that has video segments
- and when all the segments of that playlist are guaranteed to start with a key frame.
- </p>
- </dd>
- <dt>‘<samp class="samp">iframes_only</samp>’</dt>
- <dd><p>Add the <code class="code">#EXT-X-I-FRAMES-ONLY</code> tag to playlists that has video segments
- and can play only I-frames in the <code class="code">#EXT-X-BYTERANGE</code> mode.
- </p>
- </dd>
- <dt>‘<samp class="samp">split_by_time</samp>’</dt>
- <dd><p>Allow segments to start on frames other than key frames. This improves
- behavior on some players when the time between key frames is inconsistent,
- but may make things worse on others, and can cause some oddities during
- seeking. This flag should be used with the <samp class="option">hls_time</samp> option.
- </p>
- </dd>
- <dt>‘<samp class="samp">program_date_time</samp>’</dt>
- <dd><p>Generate <code class="code">EXT-X-PROGRAM-DATE-TIME</code> tags.
- </p>
- </dd>
- <dt>‘<samp class="samp">second_level_segment_index</samp>’</dt>
- <dd><p>Make it possible to use segment indexes as %%d in the
- <samp class="option">hls_segment_filename</samp> option expression besides date/time values when
- <samp class="option">strftime</samp> option is on. To get fixed width numbers with trailing zeroes, %%0xd format
- is available where x is the required width.
- </p>
- </dd>
- <dt>‘<samp class="samp">second_level_segment_size</samp>’</dt>
- <dd><p>Make it possible to use segment sizes (counted in bytes) as %%s in
- <samp class="option">hls_segment_filename</samp> option expression besides date/time values when
- strftime is on. To get fixed width numbers with trailing zeroes, %%0xs format
- is available where x is the required width.
- </p>
- </dd>
- <dt>‘<samp class="samp">second_level_segment_duration</samp>’</dt>
- <dd><p>Make it possible to use segment duration (calculated in microseconds) as %%t in
- <samp class="option">hls_segment_filename</samp> option expression besides date/time values when
- strftime is on. To get fixed width numbers with trailing zeroes, %%0xt format
- is available where x is the required width.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i sample.mpeg \
- -f hls -hls_time 3 -hls_list_size 5 \
- -hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration \
- -strftime 1 -strftime_mkdir 1 -hls_segment_filename "segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8
- </pre></div>
- <p>will produce segments like this:
- <samp class="file">segment_20170102194334_0003_00122200_0000003000000.ts</samp>, <samp class="file">segment_20170102194334_0004_00120072_0000003000000.ts</samp> etc.
- </p>
- </dd>
- <dt>‘<samp class="samp">temp_file</samp>’</dt>
- <dd><p>Write segment data to <samp class="file">filename.tmp</samp> and rename to filename only once the
- segment is complete.
- </p>
- <p>A webserver serving up segments can be configured to reject requests to *.tmp to
- prevent access to in-progress segments before they have been added to the m3u8
- playlist.
- </p>
- <p>This flag also affects how m3u8 playlist files are created. If this flag is set,
- all playlist files will be written into a temporary file and renamed after they
- are complete, similarly as segments are handled. But playlists with <code class="code">file</code>
- protocol and with <samp class="option">hls_playlist_type</samp> type other than ‘<samp class="samp">vod</samp>’ are
- always written into a temporary file regardless of this flag.
- </p>
- <p>Master playlist files specified with <samp class="option">master_pl_name</samp>, if any, with
- <code class="code">file</code> protocol, are always written into temporary file regardless of this
- flag if <samp class="option">master_pl_publish_rate</samp> value is other than zero.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">hls_playlist_type <var class="var">type</var></samp></dt>
- <dd><p>If type is ‘<samp class="samp">event</samp>’, emit <code class="code">#EXT-X-PLAYLIST-TYPE:EVENT</code> in the m3u8
- header. This forces <samp class="option">hls_list_size</samp> to 0; the playlist can only be
- appended to.
- </p>
- <p>If type is ‘<samp class="samp">vod</samp>’, emit <code class="code">#EXT-X-PLAYLIST-TYPE:VOD</code> in the m3u8
- header. This forces <samp class="option">hls_list_size</samp> to 0; the playlist must not change.
- </p>
- </dd>
- <dt><samp class="option">method <var class="var">method</var></samp></dt>
- <dd><p>Use the given HTTP method to create the hls files.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8
- </pre></div>
- <p>will upload all the mpegts segment files to the HTTP server using the HTTP PUT
- method, and update the m3u8 files every <code class="code">refresh</code> times using the same
- method. Note that the HTTP server must support the given method for uploading
- files.
- </p>
- </dd>
- <dt><samp class="option">http_user_agent <var class="var">agent</var></samp></dt>
- <dd><p>Override User-Agent field in HTTP header. Applicable only for HTTP output.
- </p>
- </dd>
- <dt><samp class="option">var_stream_map <var class="var">stream_map</var></samp></dt>
- <dd><p>Specify a map string defining how to group the audio, video and subtitle streams
- into different variant streams. The variant stream groups are separated by
- space.
- </p>
- <p>Expected string format is like this "a:0,v:0 a:1,v:1 ....". Here a:, v:, s: are
- the keys to specify audio, video and subtitle streams respectively.
- Allowed values are 0 to 9 (limited just based on practical usage).
- </p>
- <p>When there are two or more variant streams, the output filename pattern must
- contain the string "%v": this string specifies the position of variant stream
- index in the output media playlist filenames. The string "%v" may be present in
- the filename or in the last directory name containing the file. If the string is
- present in the directory name, then sub-directories are created after expanding
- the directory name pattern. This enables creation of variant streams in
- subdirectories.
- </p>
- <p>A few examples follow.
- </p>
- <ul class="itemize mark-bullet">
- <li>Create two hls variant streams. The first variant stream will contain video
- stream of bitrate 1000k and audio stream of bitrate 64k and the second variant
- stream will contain video stream of bitrate 256k and audio stream of bitrate
- 32k. Here, two media playlist with file names <samp class="file">out_0.m3u8</samp> and
- <samp class="file">out_1.m3u8</samp> will be created.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
- -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- </li><li>If you want something meaningful text instead of indexes in result names, you
- may specify names for each or some of the variants. The following example will
- create two hls variant streams as in the previous one. But here, the two media
- playlist with file names <samp class="file">out_my_hd.m3u8</samp> and <samp class="file">out_my_sd.m3u8</samp> will be
- created.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
- -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0,name:my_hd v:1,a:1,name:my_sd" \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- </li><li>Create three hls variant streams. The first variant stream will be a video only
- stream with video bitrate 1000k, the second variant stream will be an audio only
- stream with bitrate 64k and the third variant stream will be a video only stream
- with bitrate 256k. Here, three media playlist with file names <samp class="file">out_0.m3u8</samp>,
- <samp class="file">out_1.m3u8</samp> and <samp class="file">out_2.m3u8</samp> will be created.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k \
- -map 0:v -map 0:a -map 0:v -f hls -var_stream_map "v:0 a:0 v:1" \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- </li><li>Create the variant streams in subdirectories. Here, the first media playlist is
- created at <samp class="file">http://example.com/live/vs_0/out.m3u8</samp> and the second one at
- <samp class="file">http://example.com/live/vs_1/out.m3u8</samp>.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
- -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
- http://example.com/live/vs_%v/out.m3u8
- </pre></div>
- </li><li>Create two audio only and two video only variant streams. In addition to the
- <code class="code">#EXT-X-STREAM-INF</code> tag for each variant stream in the master playlist, the
- <code class="code">#EXT-X-MEDIA</code> tag is also added for the two audio only variant streams and
- they are mapped to the two video only variant streams with audio group names
- ’aud_low’ and ’aud_high’.
- By default, a single hls variant containing all the encoded streams is created.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k \
- -map 0:a -map 0:a -map 0:v -map 0:v -f hls \
- -var_stream_map "a:0,agroup:aud_low a:1,agroup:aud_high v:0,agroup:aud_low v:1,agroup:aud_high" \
- -master_pl_name master.m3u8 \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- </li><li>
- Create two audio only and one video only variant streams. In addition to the
- <code class="code">#EXT-X-STREAM-INF</code> tag for each variant stream in the master playlist, the
- <code class="code">#EXT-X-MEDIA</code> tag is also added for the two audio only variant streams and
- they are mapped to the one video only variant streams with audio group name
- ’aud_low’, and the audio group have default stat is NO or YES.
- By default, a single hls variant containing all the encoded streams is created.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
- -map 0:a -map 0:a -map 0:v -f hls \
- -var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low v:0,agroup:aud_low" \
- -master_pl_name master.m3u8 \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- </li><li>Create two audio only and one video only variant streams. In addition to the
- <code class="code">#EXT-X-STREAM-INF</code> tag for each variant stream in the master playlist, the
- <code class="code">#EXT-X-MEDIA</code> tag is also added for the two audio only variant streams and
- they are mapped to the one video only variant streams with audio group name
- ’aud_low’, and the audio group have default stat is NO or YES, and one audio
- have and language is named ENG, the other audio language is named CHN. By
- default, a single hls variant containing all the encoded streams is created.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
- -map 0:a -map 0:a -map 0:v -f hls \
- -var_stream_map "a:0,agroup:aud_low,default:yes,language:ENG a:1,agroup:aud_low,language:CHN v:0,agroup:aud_low" \
- -master_pl_name master.m3u8 \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- </li><li>Create a single variant stream. Add the <code class="code">#EXT-X-MEDIA</code> tag with
- <code class="code">TYPE=SUBTITLES</code> in the master playlist with webvtt subtitle group name
- ’subtitle’ and optional subtitle name, e.g. ’English’. Make sure the input
- file has one text subtitle stream at least.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -y -i input_with_subtitle.mkv \
- -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
- -b:a:0 256k \
- -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
- -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle,sname:English" \
- -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
- 10 -master_pl_publish_rate 10 -hls_flags \
- delete_segments+discont_start+split_by_time ./tmp/video.m3u8
- </pre></div>
- </li></ul>
- </dd>
- <dt><samp class="option">cc_stream_map <var class="var">cc_stream_map</var></samp></dt>
- <dd><p>Map string which specifies different closed captions groups and their
- attributes. The closed captions stream groups are separated by space.
- </p>
- <p>Expected string format is like this
- "ccgroup:<group name>,instreamid:<INSTREAM-ID>,language:<language code> ....".
- ’ccgroup’ and ’instreamid’ are mandatory attributes. ’language’ is an optional
- attribute.
- </p>
- <p>The closed captions groups configured using this option are mapped to different
- variant streams by providing the same ’ccgroup’ name in the
- <samp class="option">var_stream_map</samp> string.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
- -a53cc:0 1 -a53cc:1 1 \
- -map 0:v -map 0:a -map 0:v -map 0:a -f hls \
- -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp" \
- -var_stream_map "v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc" \
- -master_pl_name master.m3u8 \
- http://example.com/live/out_%v.m3u8
- </pre></div>
- <p>will add two <code class="code">#EXT-X-MEDIA</code> tags with <code class="code">TYPE=CLOSED-CAPTIONS</code> in the
- master playlist for the INSTREAM-IDs ’CC1’ and ’CC2’. Also, it will add
- <code class="code">CLOSED-CAPTIONS</code> attribute with group name ’cc’ for the two output variant
- streams.
- </p>
- <p>If <samp class="option">var_stream_map</samp> is not set, then the first available ccgroup in
- <samp class="option">cc_stream_map</samp> is mapped to the output variant stream.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \
- -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" \
- -master_pl_name master.m3u8 \
- http://example.com/live/out.m3u8
- </pre></div>
- <p>this will add <code class="code">#EXT-X-MEDIA</code> tag with <code class="code">TYPE=CLOSED-CAPTIONS</code> in the
- master playlist with group name ’cc’, language ’en’ (english) and INSTREAM-ID
- ’CC1’. Also, it will add <code class="code">CLOSED-CAPTIONS</code> attribute with group name ’cc’
- for the output variant stream.
- </p>
- </dd>
- <dt><samp class="option">master_pl_name <var class="var">name</var></samp></dt>
- <dd><p>Create HLS master playlist with the given name.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 http://example.com/live/out.m3u8
- </pre></div>
- <p>creates an HLS master playlist with name <samp class="file">master.m3u8</samp> which is published
- at <a class="url" href="http://example.com/live/">http://example.com/live/</a>.
- </p>
- </dd>
- <dt><samp class="option">master_pl_publish_rate <var class="var">count</var></samp></dt>
- <dd><p>Publish master play list repeatedly every after specified number of segment intervals.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 \
- -hls_time 2 -master_pl_publish_rate 30 http://example.com/live/out.m3u8
- </pre></div>
- <p>creates an HLS master playlist with name <samp class="file">master.m3u8</samp> and keeps
- publishing it repeatedly every after 30 segments i.e. every after 60s.
- </p>
- </dd>
- <dt><samp class="option">http_persistent <var class="var">bool</var></samp></dt>
- <dd><p>Use persistent HTTP connections. Applicable only for HTTP output.
- </p>
- </dd>
- <dt><samp class="option">timeout <var class="var">timeout</var></samp></dt>
- <dd><p>Set timeout for socket I/O operations. Applicable only for HTTP output.
- </p>
- </dd>
- <dt><samp class="option">ignore_io_errors <var class="var">bool</var></samp></dt>
- <dd><p>Ignore IO errors during open, write and delete. Useful for long-duration runs with network output.
- </p>
- </dd>
- <dt><samp class="option">headers <var class="var">headers</var></samp></dt>
- <dd><p>Set custom HTTP headers, can override built in default headers. Applicable only for HTTP output.
- </p></dd>
- </dl>
- <a name="iamf"></a>
- <h3 class="section">21.47 iamf<span class="pull-right"><a class="anchor hidden-xs" href="#iamf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-iamf" aria-hidden="true">TOC</a></span></h3>
- <p>Immersive Audio Model and Formats (IAMF) muxer.
- </p>
- <p>IAMF is used to provide immersive audio content for presentation on a wide range
- of devices in both streaming and offline applications. These applications
- include internet audio streaming, multicasting/broadcasting services, file
- download, gaming, communication, virtual and augmented reality, and others. In
- these applications, audio may be played back on a wide range of devices, e.g.,
- headphones, mobile phones, tablets, TVs, sound bars, home theater systems, and
- big screens.
- </p>
- <p>This format was promoted and designed by Alliance for Open Media.
- </p>
- <p>For more information about this format, see <a class="url" href="https://aomedia.org/iamf/">https://aomedia.org/iamf/</a>.
- </p>
- <a class="anchor" id="ico"></a><a name="ico-1"></a>
- <h3 class="section">21.48 ico<span class="pull-right"><a class="anchor hidden-xs" href="#ico-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ico-1" aria-hidden="true">TOC</a></span></h3>
- <p>ICO file muxer.
- </p>
- <p>Microsoft’s icon file format (ICO) has some strict limitations that should be noted:
- </p>
- <ul class="itemize mark-bullet">
- <li>Size cannot exceed 256 pixels in any dimension
- </li><li>Only BMP and PNG images can be stored
- </li><li>If a BMP image is used, it must be one of the following pixel formats:
- <div class="example">
- <pre class="example-preformatted">BMP Bit Depth FFmpeg Pixel Format
- 1bit pal8
- 4bit pal8
- 8bit pal8
- 16bit rgb555le
- 24bit bgr24
- 32bit bgra
- </pre></div>
- </li><li>If a BMP image is used, it must use the BITMAPINFOHEADER DIB header
- </li><li>If a PNG image is used, it must use the rgba pixel format
- </li></ul>
- <a name="ilbc"></a>
- <h3 class="section">21.49 ilbc<span class="pull-right"><a class="anchor hidden-xs" href="#ilbc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ilbc" aria-hidden="true">TOC</a></span></h3>
- <p>Internet Low Bitrate Codec (iLBC) raw muxer.
- </p>
- <p>It accepts a single ‘<samp class="samp">ilbc</samp>’ audio stream.
- </p>
- <a class="anchor" id="image2"></a><a name="image2_002c-image2pipe"></a>
- <h3 class="section">21.50 image2, image2pipe<span class="pull-right"><a class="anchor hidden-xs" href="#image2_002c-image2pipe" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-image2_002c-image2pipe" aria-hidden="true">TOC</a></span></h3>
- <p>Image file muxer.
- </p>
- <p>The ‘<samp class="samp">image2</samp>’ muxer writes video frames to image files.
- </p>
- <p>The output filenames are specified by a pattern, which can be used to
- produce sequentially numbered series of files.
- The pattern may contain the string "%d" or "%0<var class="var">N</var>d", this string
- specifies the position of the characters representing a numbering in
- the filenames. If the form "%0<var class="var">N</var>d" is used, the string
- representing the number in each filename is 0-padded to <var class="var">N</var>
- digits. The literal character ’%’ can be specified in the pattern with
- the string "%%".
- </p>
- <p>If the pattern contains "%d" or "%0<var class="var">N</var>d", the first filename of
- the file list specified will contain the number 1, all the following
- numbers will be sequential.
- </p>
- <p>The pattern may contain a suffix which is used to automatically
- determine the format of the image files to write.
- </p>
- <p>For example the pattern "img-%03d.bmp" will specify a sequence of
- filenames of the form <samp class="file">img-001.bmp</samp>, <samp class="file">img-002.bmp</samp>, ...,
- <samp class="file">img-010.bmp</samp>, etc.
- The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
- form <samp class="file">img%-1.jpg</samp>, <samp class="file">img%-2.jpg</samp>, ..., <samp class="file">img%-10.jpg</samp>,
- etc.
- </p>
- <p>The image muxer supports the .Y.U.V image file format. This format is
- special in that each image frame consists of three files, for
- each of the YUV420P components. To read or write this image file format,
- specify the name of the ’.Y’ file. The muxer will automatically open the
- ’.U’ and ’.V’ files as required.
- </p>
- <p>The ‘<samp class="samp">image2pipe</samp>’ muxer accepts the same options as the ‘<samp class="samp">image2</samp>’ muxer,
- but ignores the pattern verification and expansion, as it is supposed to write
- to the command output rather than to an actual stored file.
- </p>
- <a name="Options-84"></a>
- <h4 class="subsection">21.50.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-84" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-84" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">frame_pts <var class="var">bool</var></samp></dt>
- <dd><p>If set to 1, expand the filename with the packet PTS (presentation time stamp).
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">start_number <var class="var">count</var></samp></dt>
- <dd><p>Start the sequence from the specified number. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">update <var class="var">bool</var></samp></dt>
- <dd><p>If set to 1, the filename will always be interpreted as just a
- filename, not a pattern, and the corresponding file will be continuously
- overwritten with new images. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">strftime <var class="var">bool</var></samp></dt>
- <dd><p>If set to 1, expand the filename with date and time information from
- <code class="code">strftime()</code>. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">atomic_writing <var class="var">bool</var></samp></dt>
- <dd><p>Write output to a temporary file, which is renamed to target filename once
- writing is completed. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">protocol_opts <var class="var">options_list</var></samp></dt>
- <dd><p>Set protocol options as a :-separated list of key=value parameters. Values
- containing the <code class="code">:</code> special character must be escaped.
- </p></dd>
- </dl>
- <a name="Examples-21"></a>
- <h4 class="subsection">21.50.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-21" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-21" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> for creating a sequence of files <samp class="file">img-001.jpeg</samp>,
- <samp class="file">img-002.jpeg</samp>, ..., taking one image every second from the input video:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -vsync cfr -r 1 -f image2 'img-%03d.jpeg'
- </pre></div>
- <p>Note that with <code class="command">ffmpeg</code>, if the format is not specified with the
- <code class="code">-f</code> option and the output filename specifies an image file
- format, the image2 muxer is automatically selected, so the previous
- command can be written as:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -vsync cfr -r 1 'img-%03d.jpeg'
- </pre></div>
- <p>Note also that the pattern must not necessarily contain "%d" or
- "%0<var class="var">N</var>d", for example to create a single image file
- <samp class="file">img.jpeg</samp> from the start of the input video you can employ the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
- </pre></div>
- </li><li>The <samp class="option">strftime</samp> option allows you to expand the filename with
- date and time information. Check the documentation of
- the <code class="code">strftime()</code> function for the syntax.
- <p>To generate image files from the <code class="code">strftime()</code> "%Y-%m-%d_%H-%M-%S" pattern,
- the following <code class="command">ffmpeg</code> command can be used:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
- </pre></div>
- </li><li>Set the file name with current frame’s PTS:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -frame_pts true %d.jpg
- </pre></div>
- </li><li>Publish contents of your desktop directly to a WebDAV server every second:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg
- </pre></div>
- </li></ul>
- <a name="ircam"></a>
- <h3 class="section">21.51 ircam<span class="pull-right"><a class="anchor hidden-xs" href="#ircam" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ircam" aria-hidden="true">TOC</a></span></h3>
- <p>Berkeley / IRCAM / CARL Sound Filesystem (BICSF) format muxer.
- </p>
- <p>The Berkeley/IRCAM/CARL Sound Format, developed in the 1980s, is a result of the
- merging of several different earlier sound file formats and systems including
- the csound system developed by Dr Gareth Loy at the Computer Audio Research Lab
- (CARL) at UC San Diego, the IRCAM sound file system developed by Rob Gross and
- Dan Timis at the Institut de Recherche et Coordination Acoustique / Musique in
- Paris and the Berkeley Fast Filesystem.
- </p>
- <p>It was developed initially as part of the Berkeley/IRCAM/CARL Sound Filesystem,
- a suite of programs designed to implement a filesystem for audio applications
- running under Berkeley UNIX. It was particularly popular in academic music
- research centres, and was used a number of times in the creation of early
- computer-generated compositions.
- </p>
- <p>This muxer accepts a single audio stream containing PCM data.
- </p>
- <a name="ivf"></a>
- <h3 class="section">21.52 ivf<span class="pull-right"><a class="anchor hidden-xs" href="#ivf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ivf" aria-hidden="true">TOC</a></span></h3>
- <p>On2 IVF muxer.
- </p>
- <p>IVF was developed by On2 Technologies (formerly known as Duck
- Corporation), to store internally developed codecs.
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">vp8</samp>’, ‘<samp class="samp">vp9</samp>’, or ‘<samp class="samp">av1</samp>’
- video stream.
- </p>
- <a name="jacosub"></a>
- <h3 class="section">21.53 jacosub<span class="pull-right"><a class="anchor hidden-xs" href="#jacosub" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-jacosub" aria-hidden="true">TOC</a></span></h3>
- <p>JACOsub subtitle format muxer.
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">jacosub</samp>’ subtitles stream.
- </p>
- <p>For more information about the format, see
- <a class="url" href="http://unicorn.us.com/jacosub/jscripts.html">http://unicorn.us.com/jacosub/jscripts.html</a>.
- </p>
- <a name="kvag"></a>
- <h3 class="section">21.54 kvag<span class="pull-right"><a class="anchor hidden-xs" href="#kvag" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-kvag" aria-hidden="true">TOC</a></span></h3>
- <p>Simon & Schuster Interactive VAG muxer.
- </p>
- <p>This custom VAG container is used by some Simon & Schuster Interactive
- games such as "Real War", and "Real War: Rogue States".
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">adpcm_ima_ssi</samp>’ audio stream.
- </p>
- <a name="lc3"></a>
- <h3 class="section">21.55 lc3<span class="pull-right"><a class="anchor hidden-xs" href="#lc3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lc3" aria-hidden="true">TOC</a></span></h3>
- <p>Bluetooth SIG Low Complexity Communication Codec audio (LC3), or
- ETSI TS 103 634 Low Complexity Communication Codec plus (LC3plus).
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">lc3</samp>’ audio stream.
- </p>
- <a name="lrc-1"></a>
- <h3 class="section">21.56 lrc<span class="pull-right"><a class="anchor hidden-xs" href="#lrc-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lrc-1" aria-hidden="true">TOC</a></span></h3>
- <p>LRC lyrics file format muxer.
- </p>
- <p>LRC (short for LyRiCs) is a computer file format that synchronizes
- song lyrics with an audio file, such as MP3, Vorbis, or MIDI.
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">subrip</samp>’ or ‘<samp class="samp">text</samp>’ subtitles stream.
- </p>
- <a name="Metadata"></a>
- <h4 class="subsection">21.56.1 Metadata<span class="pull-right"><a class="anchor hidden-xs" href="#Metadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Metadata" aria-hidden="true">TOC</a></span></h4>
- <p>The following metadata tags are converted to the format corresponding
- metadata:
- </p>
- <dl class="table">
- <dt><samp class="option">title</samp></dt>
- <dt><samp class="option">album</samp></dt>
- <dt><samp class="option">artist</samp></dt>
- <dt><samp class="option">author</samp></dt>
- <dt><samp class="option">creator</samp></dt>
- <dt><samp class="option">encoder</samp></dt>
- <dt><samp class="option">encoder_version</samp></dt>
- </dl>
- <p>If ‘<samp class="samp">encoder_version</samp>’ is not explicitly set, it is automatically
- set to the libavformat version.
- </p>
- <a name="matroska"></a>
- <h3 class="section">21.57 matroska<span class="pull-right"><a class="anchor hidden-xs" href="#matroska" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-matroska" aria-hidden="true">TOC</a></span></h3>
- <p>Matroska container muxer.
- </p>
- <p>This muxer implements the matroska and webm container specs.
- </p>
- <a name="Metadata-1"></a>
- <h4 class="subsection">21.57.1 Metadata<span class="pull-right"><a class="anchor hidden-xs" href="#Metadata-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Metadata-1" aria-hidden="true">TOC</a></span></h4>
- <p>The recognized metadata settings in this muxer are:
- </p>
- <dl class="table">
- <dt><samp class="option">title</samp></dt>
- <dd><p>Set title name provided to a single track. This gets mapped to
- the FileDescription element for a stream written as attachment.
- </p>
- </dd>
- <dt><samp class="option">language</samp></dt>
- <dd><p>Specify the language of the track in the Matroska languages form.
- </p>
- <p>The language can be either the 3 letters bibliographic ISO-639-2 (ISO
- 639-2/B) form (like "fre" for French), or a language code mixed with a
- country code for specialities in languages (like "fre-ca" for Canadian
- French).
- </p>
- </dd>
- <dt><samp class="option">stereo_mode</samp></dt>
- <dd><p>Set stereo 3D video layout of two views in a single video track.
- </p>
- <p>The following values are recognized:
- </p><dl class="table">
- <dt>‘<samp class="samp">mono</samp>’</dt>
- <dd><p>video is not stereo
- </p></dd>
- <dt>‘<samp class="samp">left_right</samp>’</dt>
- <dd><p>Both views are arranged side by side, Left-eye view is on the left
- </p></dd>
- <dt>‘<samp class="samp">bottom_top</samp>’</dt>
- <dd><p>Both views are arranged in top-bottom orientation, Left-eye view is at bottom
- </p></dd>
- <dt>‘<samp class="samp">top_bottom</samp>’</dt>
- <dd><p>Both views are arranged in top-bottom orientation, Left-eye view is on top
- </p></dd>
- <dt>‘<samp class="samp">checkerboard_rl</samp>’</dt>
- <dd><p>Each view is arranged in a checkerboard interleaved pattern, Left-eye view being first
- </p></dd>
- <dt>‘<samp class="samp">checkerboard_lr</samp>’</dt>
- <dd><p>Each view is arranged in a checkerboard interleaved pattern, Right-eye view being first
- </p></dd>
- <dt>‘<samp class="samp">row_interleaved_rl</samp>’</dt>
- <dd><p>Each view is constituted by a row based interleaving, Right-eye view is first row
- </p></dd>
- <dt>‘<samp class="samp">row_interleaved_lr</samp>’</dt>
- <dd><p>Each view is constituted by a row based interleaving, Left-eye view is first row
- </p></dd>
- <dt>‘<samp class="samp">col_interleaved_rl</samp>’</dt>
- <dd><p>Both views are arranged in a column based interleaving manner, Right-eye view is first column
- </p></dd>
- <dt>‘<samp class="samp">col_interleaved_lr</samp>’</dt>
- <dd><p>Both views are arranged in a column based interleaving manner, Left-eye view is first column
- </p></dd>
- <dt>‘<samp class="samp">anaglyph_cyan_red</samp>’</dt>
- <dd><p>All frames are in anaglyph format viewable through red-cyan filters
- </p></dd>
- <dt>‘<samp class="samp">right_left</samp>’</dt>
- <dd><p>Both views are arranged side by side, Right-eye view is on the left
- </p></dd>
- <dt>‘<samp class="samp">anaglyph_green_magenta</samp>’</dt>
- <dd><p>All frames are in anaglyph format viewable through green-magenta filters
- </p></dd>
- <dt>‘<samp class="samp">block_lr</samp>’</dt>
- <dd><p>Both eyes laced in one Block, Left-eye view is first
- </p></dd>
- <dt>‘<samp class="samp">block_rl</samp>’</dt>
- <dd><p>Both eyes laced in one Block, Right-eye view is first
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>For example a 3D WebM clip can be created using the following command line:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i sample_left_right_clip.mpg -an -c:v libvpx -metadata stereo_mode=left_right -y stereo_clip.webm
- </pre></div>
- <a name="Options-85"></a>
- <h4 class="subsection">21.57.2 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-85" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-85" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">reserve_index_space <var class="var">size</var></samp></dt>
- <dd><p>By default, this muxer writes the index for seeking (called cues in Matroska
- terms) at the end of the file, because it cannot know in advance how much space
- to leave for the index at the beginning of the file. However for some use cases
- – e.g. streaming where seeking is possible but slow – it is useful to put the
- index at the beginning of the file.
- </p>
- <p>If this option is set to a non-zero value, the muxer will reserve <var class="var">size</var> bytes
- of space in the file header and then try to write the cues there when the muxing
- finishes. If the reserved space does not suffice, no Cues will be written, the
- file will be finalized and writing the trailer will return an error.
- A safe size for most use cases should be about 50kB per hour of video.
- </p>
- <p>Note that cues are only written if the output is seekable and this option will
- have no effect if it is not.
- </p>
- </dd>
- <dt><samp class="option">cues_to_front <var class="var">bool</var></samp></dt>
- <dd><p>If set, the muxer will write the index at the beginning of the file
- by shifting the main data if necessary. This can be combined with
- reserve_index_space in which case the data is only shifted if
- the initially reserved space turns out to be insufficient.
- </p>
- <p>This option is ignored if the output is unseekable.
- </p>
- </dd>
- <dt><samp class="option">cluster_size_limit <var class="var">size</var></samp></dt>
- <dd><p>Store at most the provided amount of bytes in a cluster.
- </p>
- <p>If not specified, the limit is set automatically to a sensible
- hardcoded fixed value.
- </p>
- </dd>
- <dt><samp class="option">cluster_time_limit <var class="var">duration</var></samp></dt>
- <dd><p>Store at most the provided number of milliseconds in a cluster.
- </p>
- <p>If not specified, the limit is set automatically to a sensible
- hardcoded fixed value.
- </p>
- </dd>
- <dt><samp class="option">dash <var class="var">bool</var></samp></dt>
- <dd><p>Create a WebM file conforming to WebM DASH specification. By default
- it is set to <code class="code">false</code>.
- </p>
- </dd>
- <dt><samp class="option">dash_track_number <var class="var">index</var></samp></dt>
- <dd><p>Track number for the DASH stream. By default it is set to <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">live <var class="var">bool</var></samp></dt>
- <dd><p>Write files assuming it is a live stream. By default it is set to
- <code class="code">false</code>.
- </p>
- </dd>
- <dt><samp class="option">allow_raw_vfw <var class="var">bool</var></samp></dt>
- <dd><p>Allow raw VFW mode. By default it is set to <code class="code">false</code>.
- </p>
- </dd>
- <dt><samp class="option">flipped_raw_rgb <var class="var">bool</var></samp></dt>
- <dd><p>If set to <code class="code">true</code>, store positive height for raw RGB bitmaps, which indicates
- bitmap is stored bottom-up. Note that this option does not flip the bitmap
- which has to be done manually beforehand, e.g. by using the ‘<samp class="samp">vflip</samp>’ filter.
- Default is <code class="code">false</code> and indicates bitmap is stored top down.
- </p>
- </dd>
- <dt><samp class="option">write_crc32 <var class="var">bool</var></samp></dt>
- <dd><p>Write a CRC32 element inside every Level 1 element. By default it is
- set to <code class="code">true</code>. This option is ignored for WebM.
- </p>
- </dd>
- <dt><samp class="option">default_mode <var class="var">mode</var></samp></dt>
- <dd><p>Control how the FlagDefault of the output tracks will be set.
- It influences which tracks players should play by default. The default mode
- is ‘<samp class="samp">passthrough</samp>’.
- </p><dl class="table">
- <dt>‘<samp class="samp">infer</samp>’</dt>
- <dd><p>Every track with disposition default will have the FlagDefault set.
- Additionally, for each type of track (audio, video or subtitle), if no track
- with disposition default of this type exists, then the first track of this type
- will be marked as default (if existing). This ensures that the default flag
- is set in a sensible way even if the input originated from containers that
- lack the concept of default tracks.
- </p></dd>
- <dt>‘<samp class="samp">infer_no_subs</samp>’</dt>
- <dd><p>This mode is the same as infer except that if no subtitle track with
- disposition default exists, no subtitle track will be marked as default.
- </p></dd>
- <dt>‘<samp class="samp">passthrough</samp>’</dt>
- <dd><p>In this mode the FlagDefault is set if and only if the AV_DISPOSITION_DEFAULT
- flag is set in the disposition of the corresponding stream.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="md5"></a><a name="md5-1"></a>
- <h3 class="section">21.58 md5<span class="pull-right"><a class="anchor hidden-xs" href="#md5-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-md5-1" aria-hidden="true">TOC</a></span></h3>
- <p>MD5 testing format.
- </p>
- <p>This is a variant of the <a class="ref" href="#hash">hash</a> muxer. Unlike that muxer, it
- defaults to using the MD5 hash function.
- </p>
- <p>See also the <a class="ref" href="#hash">hash</a> and <a class="ref" href="#framemd5">framemd5</a> muxers.
- </p>
- <a name="Examples-22"></a>
- <h4 class="subsection">21.58.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-22" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-22" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>To compute the MD5 hash of the input converted to raw
- audio and video, and store it in the file <samp class="file">out.md5</samp>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f md5 out.md5
- </pre></div>
- </li><li>To print the MD5 hash to stdout:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f md5 -
- </pre></div>
- </li></ul>
- <a class="anchor" id="mccenc"></a><a name="mcc-1"></a>
- <h3 class="section">21.59 mcc<span class="pull-right"><a class="anchor hidden-xs" href="#mcc-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mcc-1" aria-hidden="true">TOC</a></span></h3>
- <p>Muxer for MacCaption MCC files, it supports MCC versions 1.0 and 2.0.
- MCC files store VANC data, which can include closed captions (EIA-608 and CEA-708), ancillary time code, pan-scan data, etc.
- </p>
- <a name="Options-86"></a>
- <h4 class="subsection">21.59.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-86" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-86" aria-hidden="true">TOC</a></span></h4>
- <p>The muxer options are:
- </p>
- <dl class="table">
- <dt><samp class="option">override_time_code_rate</samp></dt>
- <dd><p>Override the <code class="code">Time Code Rate</code> value in the output. Defaults to trying to deduce from the stream’s <code class="code">time_base</code>, which often doesn’t work.
- </p></dd>
- <dt><samp class="option">use_u_alias</samp></dt>
- <dd><p>Use the <code class="code">U</code> alias for the byte sequence <code class="code">E1h 00h 00h 00h</code>.
- Disabled by default because some <samp class="file">.mcc</samp> files disagree on whether it has 2 or 3 zero bytes.
- </p></dd>
- <dt><samp class="option">mcc_version</samp></dt>
- <dd><p>The MCC file format version. Must be either 1 or 2, defaults to 2.
- </p></dd>
- <dt><samp class="option">creation_program</samp></dt>
- <dd><p>The creation program. Defaults to this version of FFmpeg.
- </p></dd>
- <dt><samp class="option">creation_time</samp></dt>
- <dd><p>The creation time. Defaults to the current time.
- </p></dd>
- </dl>
- <a name="Examples-23"></a>
- <h4 class="subsection">21.59.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-23" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-23" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Extract a MXF <code class="code">SMPTE_436M_ANC</code> stream from a MXF file and write it to a MCC file at 30 fps.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mxf -c copy -map 0:d -override_time_code_rate 30 out.mcc
- </pre></div>
- </li><li>Extract EIA-608/CTA-708 closed captions from a <samp class="file">.mp4</samp> file and write them to a MCC file at 29.97 fps.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i "movie=input.mp4[out+subcc]" -c:s copy -map 0:s -override_time_code_rate 30000/1001 out.mcc
- </pre></div>
- </li></ul>
- <a name="microdvd"></a>
- <h3 class="section">21.60 microdvd<span class="pull-right"><a class="anchor hidden-xs" href="#microdvd" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-microdvd" aria-hidden="true">TOC</a></span></h3>
- <p>MicroDVD subtitle format muxer.
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">microdvd</samp>’ subtitles stream.
- </p>
- <a name="mmf"></a>
- <h3 class="section">21.61 mmf<span class="pull-right"><a class="anchor hidden-xs" href="#mmf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mmf" aria-hidden="true">TOC</a></span></h3>
- <p>Synthetic music Mobile Application Format (SMAF) format muxer.
- </p>
- <p>SMAF is a music data format specified by Yamaha for portable
- electronic devices, such as mobile phones and personal digital
- assistants.
- </p>
- <p>This muxer accepts a single ‘<samp class="samp">adpcm_yamaha</samp>’ audio stream.
- </p>
- <a name="mp3"></a>
- <h3 class="section">21.62 mp3<span class="pull-right"><a class="anchor hidden-xs" href="#mp3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mp3" aria-hidden="true">TOC</a></span></h3>
- <p>The MP3 muxer writes a raw MP3 stream with the following optional features:
- </p><ul class="itemize mark-bullet">
- <li>An ID3v2 metadata header at the beginning (enabled by default). Versions 2.3 and
- 2.4 are supported, the <code class="code">id3v2_version</code> private option controls which one is
- used (3 or 4). Setting <code class="code">id3v2_version</code> to 0 disables the ID3v2 header
- completely.
- <p>The muxer supports writing attached pictures (APIC frames) to the ID3v2 header.
- The pictures are supplied to the muxer in form of a video stream with a single
- packet. There can be any number of those streams, each will correspond to a
- single APIC frame. The stream metadata tags <var class="var">title</var> and <var class="var">comment</var> map
- to APIC <var class="var">description</var> and <var class="var">picture type</var> respectively. See
- <a class="url" href="http://id3.org/id3v2.4.0-frames">http://id3.org/id3v2.4.0-frames</a> for allowed picture types.
- </p>
- <p>Note that the APIC frames must be written at the beginning, so the muxer will
- buffer the audio frames until it gets all the pictures. It is therefore advised
- to provide the pictures as soon as possible to avoid excessive buffering.
- </p>
- </li><li>A Xing/LAME frame right after the ID3v2 header (if present). It is enabled by
- default, but will be written only if the output is seekable. The
- <code class="code">write_xing</code> private option can be used to disable it. The frame contains
- various information that may be useful to the decoder, like the audio duration
- or encoder delay.
- </li><li>A legacy ID3v1 tag at the end of the file (disabled by default). It may be
- enabled with the <code class="code">write_id3v1</code> private option, but as its capabilities are
- very limited, its usage is not recommended.
- </li></ul>
- <p>Examples:
- </p>
- <p>Write an mp3 with an ID3v2.3 header and an ID3v1 footer:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -id3v2_version 3 -write_id3v1 1 out.mp3
- </pre></div>
- <p>To attach a picture to an mp3 file select both the audio and the picture stream
- with <code class="code">map</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1
- -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3
- </pre></div>
- <p>Write a "clean" MP3 without any extra features:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
- </pre></div>
- <a name="mpegts-1"></a>
- <h3 class="section">21.63 mpegts<span class="pull-right"><a class="anchor hidden-xs" href="#mpegts-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpegts-1" aria-hidden="true">TOC</a></span></h3>
- <p>MPEG transport stream muxer.
- </p>
- <p>This muxer implements ISO 13818-1 and part of ETSI EN 300 468.
- </p>
- <p>The recognized metadata settings in mpegts muxer are <code class="code">service_provider</code>
- and <code class="code">service_name</code>. If they are not set the default for
- <code class="code">service_provider</code> is ‘<samp class="samp">FFmpeg</samp>’ and the default for
- <code class="code">service_name</code> is ‘<samp class="samp">Service01</samp>’.
- </p>
- <a name="Options-87"></a>
- <h4 class="subsection">21.63.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-87" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-87" aria-hidden="true">TOC</a></span></h4>
- <p>The muxer options are:
- </p>
- <dl class="table">
- <dt><samp class="option">mpegts_transport_stream_id <var class="var">integer</var></samp></dt>
- <dd><p>Set the ‘<samp class="samp">transport_stream_id</samp>’. This identifies a transponder in DVB.
- Default is <code class="code">0x0001</code>.
- </p>
- </dd>
- <dt><samp class="option">mpegts_original_network_id <var class="var">integer</var></samp></dt>
- <dd><p>Set the ‘<samp class="samp">original_network_id</samp>’. This is unique identifier of a
- network in DVB. Its main use is in the unique identification of a service
- through the path ‘<samp class="samp">Original_Network_ID, Transport_Stream_ID</samp>’. Default
- is <code class="code">0x0001</code>.
- </p>
- </dd>
- <dt><samp class="option">mpegts_service_id <var class="var">integer</var></samp></dt>
- <dd><p>Set the ‘<samp class="samp">service_id</samp>’, also known as program in DVB. Default is
- <code class="code">0x0001</code>.
- </p>
- </dd>
- <dt><samp class="option">mpegts_service_type <var class="var">integer</var></samp></dt>
- <dd><p>Set the program ‘<samp class="samp">service_type</samp>’. Default is <code class="code">digital_tv</code>.
- Accepts the following options:
- </p><dl class="table">
- <dt>‘<samp class="samp">hex_value</samp>’</dt>
- <dd><p>Any hexadecimal value between <code class="code">0x01</code> and <code class="code">0xff</code> as defined in
- ETSI 300 468.
- </p></dd>
- <dt>‘<samp class="samp">digital_tv</samp>’</dt>
- <dd><p>Digital TV service.
- </p></dd>
- <dt>‘<samp class="samp">digital_radio</samp>’</dt>
- <dd><p>Digital Radio service.
- </p></dd>
- <dt>‘<samp class="samp">teletext</samp>’</dt>
- <dd><p>Teletext service.
- </p></dd>
- <dt>‘<samp class="samp">advanced_codec_digital_radio</samp>’</dt>
- <dd><p>Advanced Codec Digital Radio service.
- </p></dd>
- <dt>‘<samp class="samp">mpeg2_digital_hdtv</samp>’</dt>
- <dd><p>MPEG2 Digital HDTV service.
- </p></dd>
- <dt>‘<samp class="samp">advanced_codec_digital_sdtv</samp>’</dt>
- <dd><p>Advanced Codec Digital SDTV service.
- </p></dd>
- <dt>‘<samp class="samp">advanced_codec_digital_hdtv</samp>’</dt>
- <dd><p>Advanced Codec Digital HDTV service.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">mpegts_pmt_start_pid <var class="var">integer</var></samp></dt>
- <dd><p>Set the first PID for PMTs. Default is <code class="code">0x1000</code>, minimum is <code class="code">0x0020</code>,
- maximum is <code class="code">0x1ffa</code>. This option has no effect in m2ts mode where the PMT
- PID is fixed <code class="code">0x0100</code>.
- </p>
- </dd>
- <dt><samp class="option">mpegts_start_pid <var class="var">integer</var></samp></dt>
- <dd><p>Set the first PID for elementary streams. Default is <code class="code">0x0100</code>, minimum is
- <code class="code">0x0020</code>, maximum is <code class="code">0x1ffa</code>. This option has no effect in m2ts mode
- where the elementary stream PIDs are fixed.
- </p>
- </dd>
- <dt><samp class="option">mpegts_m2ts_mode <var class="var">boolean</var></samp></dt>
- <dd><p>Enable m2ts mode if set to <code class="code">1</code>. Default value is <code class="code">-1</code> which
- disables m2ts mode.
- </p>
- </dd>
- <dt><samp class="option">muxrate <var class="var">integer</var></samp></dt>
- <dd><p>Set a constant muxrate. Default is VBR.
- </p>
- </dd>
- <dt><samp class="option">pes_payload_size <var class="var">integer</var></samp></dt>
- <dd><p>Set minimum PES packet payload in bytes. Default is <code class="code">2930</code>.
- </p>
- </dd>
- <dt><samp class="option">mpegts_flags <var class="var">flags</var></samp></dt>
- <dd><p>Set mpegts flags. Accepts the following options:
- </p><dl class="table">
- <dt>‘<samp class="samp">resend_headers</samp>’</dt>
- <dd><p>Reemit PAT/PMT before writing the next packet.
- </p></dd>
- <dt>‘<samp class="samp">latm</samp>’</dt>
- <dd><p>Use LATM packetization for AAC.
- </p></dd>
- <dt>‘<samp class="samp">pat_pmt_at_frames</samp>’</dt>
- <dd><p>Reemit PAT and PMT at each video frame.
- </p></dd>
- <dt>‘<samp class="samp">system_b</samp>’</dt>
- <dd><p>Conform to System B (DVB) instead of System A (ATSC).
- </p></dd>
- <dt>‘<samp class="samp">initial_discontinuity</samp>’</dt>
- <dd><p>Mark the initial packet of each stream as discontinuity.
- </p></dd>
- <dt>‘<samp class="samp">nit</samp>’</dt>
- <dd><p>Emit NIT table.
- </p></dd>
- <dt>‘<samp class="samp">omit_rai</samp>’</dt>
- <dd><p>Disable writing of random access indicator.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">mpegts_copyts <var class="var">boolean</var></samp></dt>
- <dd><p>Preserve original timestamps, if value is set to <code class="code">1</code>. Default value
- is <code class="code">-1</code>, which results in shifting timestamps so that they start from 0.
- </p>
- </dd>
- <dt><samp class="option">omit_video_pes_length <var class="var">boolean</var></samp></dt>
- <dd><p>Omit the PES packet length for video packets. Default is <code class="code">1</code> (true).
- </p>
- </dd>
- <dt><samp class="option">pcr_period <var class="var">integer</var></samp></dt>
- <dd><p>Override the default PCR retransmission time in milliseconds. Default is
- <code class="code">-1</code> which means that the PCR interval will be determined automatically:
- 20 ms is used for CBR streams, the highest multiple of the frame duration which
- is less than 100 ms is used for VBR streams.
- </p>
- </dd>
- <dt><samp class="option">pat_period <var class="var">duration</var></samp></dt>
- <dd><p>Maximum time in seconds between PAT/PMT tables. Default is <code class="code">0.1</code>.
- </p>
- </dd>
- <dt><samp class="option">sdt_period <var class="var">duration</var></samp></dt>
- <dd><p>Maximum time in seconds between SDT tables. Default is <code class="code">0.5</code>.
- </p>
- </dd>
- <dt><samp class="option">nit_period <var class="var">duration</var></samp></dt>
- <dd><p>Maximum time in seconds between NIT tables. Default is <code class="code">0.5</code>.
- </p>
- </dd>
- <dt><samp class="option">tables_version <var class="var">integer</var></samp></dt>
- <dd><p>Set PAT, PMT, SDT and NIT version (default <code class="code">0</code>, valid values are from 0 to 31, inclusively).
- This option allows updating stream structure so that standard consumer may
- detect the change. To do so, reopen output <code class="code">AVFormatContext</code> (in case of API
- usage) or restart <code class="command">ffmpeg</code> instance, cyclically changing
- <samp class="option">tables_version</samp> value:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
- ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
- ...
- ffmpeg -i source3.ts -codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
- ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
- ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
- ...
- </pre></div>
- </dd>
- </dl>
- <a name="Example-8"></a>
- <h4 class="subsection">21.63.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-8" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-8" aria-hidden="true">TOC</a></span></h4>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i file.mpg -c copy \
- -mpegts_original_network_id 0x1122 \
- -mpegts_transport_stream_id 0x3344 \
- -mpegts_service_id 0x5566 \
- -mpegts_pmt_start_pid 0x1500 \
- -mpegts_start_pid 0x150 \
- -metadata service_provider="Some provider" \
- -metadata service_name="Some Channel" \
- out.ts
- </pre></div>
- <a name="mxf_002c-mxf_005fd10_002c-mxf_005fopatom"></a>
- <h3 class="section">21.64 mxf, mxf_d10, mxf_opatom<span class="pull-right"><a class="anchor hidden-xs" href="#mxf_002c-mxf_005fd10_002c-mxf_005fopatom" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mxf_002c-mxf_005fd10_002c-mxf_005fopatom" aria-hidden="true">TOC</a></span></h3>
- <p>MXF muxer.
- </p>
- <a name="Options-88"></a>
- <h4 class="subsection">21.64.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-88" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-88" aria-hidden="true">TOC</a></span></h4>
- <p>The muxer options are:
- </p>
- <dl class="table">
- <dt><samp class="option">store_user_comments <var class="var">bool</var></samp></dt>
- <dd><p>Set if user comments should be stored if available or never.
- IRT D-10 does not allow user comments. The default is thus to write them for
- mxf and mxf_opatom but not for mxf_d10
- </p></dd>
- </dl>
- <a name="null-1"></a>
- <h3 class="section">21.65 null<span class="pull-right"><a class="anchor hidden-xs" href="#null-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-null-1" aria-hidden="true">TOC</a></span></h3>
- <p>Null muxer.
- </p>
- <p>This muxer does not generate any output file, it is mainly useful for
- testing or benchmarking purposes.
- </p>
- <p>For example to benchmark decoding with <code class="command">ffmpeg</code> you can use the
- command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -benchmark -i INPUT -f null out.null
- </pre></div>
- <p>Note that the above command does not read or write the <samp class="file">out.null</samp>
- file, but specifying the output file is required by the <code class="command">ffmpeg</code>
- syntax.
- </p>
- <p>Alternatively you can write the command as:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -benchmark -i INPUT -f null -
- </pre></div>
- <a name="nut"></a>
- <h3 class="section">21.66 nut<span class="pull-right"><a class="anchor hidden-xs" href="#nut" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-nut" aria-hidden="true">TOC</a></span></h3>
- <dl class="table">
- <dt><samp class="option">-syncpoints <var class="var">flags</var></samp></dt>
- <dd><p>Change the syncpoint usage in nut:
- </p><dl class="table">
- <dt><samp class="option"><var class="var">default</var> use the normal low-overhead seeking aids.</samp></dt>
- <dt><samp class="option"><var class="var">none</var> do not use the syncpoints at all, reducing the overhead but making the stream non-seekable;</samp></dt>
- <dd><p>Use of this option is not recommended, as the resulting files are very damage
- sensitive and seeking is not possible. Also in general the overhead from
- syncpoints is negligible. Note, -<code class="code">write_index</code> 0 can be used to disable
- all growing data tables, allowing to mux endless streams with limited memory
- and without these disadvantages.
- </p></dd>
- <dt><samp class="option"><var class="var">timestamped</var> extend the syncpoint with a wallclock field.</samp></dt>
- </dl>
- <p>The <var class="var">none</var> and <var class="var">timestamped</var> flags are experimental.
- </p></dd>
- <dt><samp class="option">-write_index <var class="var">bool</var></samp></dt>
- <dd><p>Write index at the end, the default is to write an index.
- </p></dd>
- </dl>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor
- </pre></div>
- <a name="ogg"></a>
- <h3 class="section">21.67 ogg<span class="pull-right"><a class="anchor hidden-xs" href="#ogg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ogg" aria-hidden="true">TOC</a></span></h3>
- <p>Ogg container muxer.
- </p>
- <dl class="table">
- <dt><samp class="option">-page_duration <var class="var">duration</var></samp></dt>
- <dd><p>Preferred page duration, in microseconds. The muxer will attempt to create
- pages that are approximately <var class="var">duration</var> microseconds long. This allows the
- user to compromise between seek granularity and container overhead. The default
- is 1 second. A value of 0 will fill all segments, making pages as large as
- possible. A value of 1 will effectively use 1 packet-per-page in most
- situations, giving a small seek granularity at the cost of additional container
- overhead.
- </p></dd>
- <dt><samp class="option">-serial_offset <var class="var">value</var></samp></dt>
- <dd><p>Serial value from which to set the streams serial number.
- Setting it to different and sufficiently large values ensures that the produced
- ogg files can be safely chained.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="rcwtenc"></a><a name="rcwt-1"></a>
- <h3 class="section">21.68 rcwt<span class="pull-right"><a class="anchor hidden-xs" href="#rcwt-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rcwt-1" aria-hidden="true">TOC</a></span></h3>
- <p>RCWT (Raw Captions With Time) is a format native to ccextractor, a commonly
- used open source tool for processing 608/708 Closed Captions (CC) sources.
- It can be used to archive the original extracted CC bitstream and to produce
- a source file for later processing or conversion. The format allows
- for interoperability between ccextractor and FFmpeg, is simple to parse,
- and can be used to create a backup of the CC presentation.
- </p>
- <p>This muxer implements the specification as of March 2024, which has
- been stable and unchanged since April 2014.
- </p>
- <p>This muxer will have some nuances from the way that ccextractor muxes RCWT.
- No compatibility issues when processing the output with ccextractor
- have been observed as a result of this so far, but mileage may vary
- and outputs will not be a bit-exact match.
- </p>
- <p>A free specification of RCWT can be found here:
- <a class="url" href="https://github.com/CCExtractor/ccextractor/blob/master/docs/BINARY_FILE_FORMAT.TXT">https://github.com/CCExtractor/ccextractor/blob/master/docs/BINARY_FILE_FORMAT.TXT</a>
- </p>
- <a name="Examples-24"></a>
- <h4 class="subsection">21.68.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-24" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-24" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Extract Closed Captions to RCWT using lavfi:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i "movie=INPUT.mkv[out+subcc]" -map 0:s:0 -c:s copy -f rcwt CC.rcwt.bin
- </pre></div>
- </li></ul>
- <a class="anchor" id="segment"></a><a name="segment_002c-stream_005fsegment_002c-ssegment"></a>
- <h3 class="section">21.69 segment, stream_segment, ssegment<span class="pull-right"><a class="anchor hidden-xs" href="#segment_002c-stream_005fsegment_002c-ssegment" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-segment_002c-stream_005fsegment_002c-ssegment" aria-hidden="true">TOC</a></span></h3>
- <p>Basic stream segmenter.
- </p>
- <p>This muxer outputs streams to a number of separate files of nearly
- fixed duration. Output filename pattern can be set in a fashion
- similar to <a class="ref" href="#image2">image2</a>, or by using a <code class="code">strftime</code> template if
- the <samp class="option">strftime</samp> option is enabled.
- </p>
- <p><code class="code">stream_segment</code> is a variant of the muxer used to write to
- streaming output formats, i.e. which do not require global headers,
- and is recommended for outputting e.g. to MPEG transport stream segments.
- <code class="code">ssegment</code> is a shorter alias for <code class="code">stream_segment</code>.
- </p>
- <p>Every segment starts with a keyframe of the selected reference stream,
- which is set through the <samp class="option">reference_stream</samp> option.
- </p>
- <p>Note that if you want accurate splitting for a video file, you need to
- make the input key frames correspond to the exact splitting times
- expected by the segmenter, or the segment muxer will start the new
- segment with the key frame found next after the specified start
- time.
- </p>
- <p>The segment muxer works best with a single constant frame rate video.
- </p>
- <p>Optionally it can generate a list of the created segments, by setting
- the option <var class="var">segment_list</var>. The list type is specified by the
- <var class="var">segment_list_type</var> option. The entry filenames in the segment
- list are set by default to the basename of the corresponding segment
- files.
- </p>
- <p>See also the <a class="ref" href="#hls">hls</a> muxer, which provides a more specific
- implementation for HLS segmentation.
- </p>
- <a name="Options-89"></a>
- <h4 class="subsection">21.69.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-89" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-89" aria-hidden="true">TOC</a></span></h4>
- <p>The segment muxer supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">increment_tc <var class="var">1|0</var></samp></dt>
- <dd><p>if set to <code class="code">1</code>, increment timecode between each segment
- If this is selected, the input need to have
- a timecode in the first video stream. Default value is
- <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">reference_stream <var class="var">specifier</var></samp></dt>
- <dd><p>Set the reference stream, as specified by the string <var class="var">specifier</var>.
- If <var class="var">specifier</var> is set to <code class="code">auto</code>, the reference is chosen
- automatically. Otherwise it must be a stream specifier (see the “Stream
- specifiers” chapter in the ffmpeg manual) which specifies the
- reference stream. The default value is <code class="code">auto</code>.
- </p>
- </dd>
- <dt><samp class="option">segment_format <var class="var">format</var></samp></dt>
- <dd><p>Override the inner container format, by default it is guessed by the filename
- extension.
- </p>
- </dd>
- <dt><samp class="option">segment_format_options <var class="var">options_list</var></samp></dt>
- <dd><p>Set output format options using a :-separated list of key=value
- parameters. Values containing the <code class="code">:</code> special character must be
- escaped.
- </p>
- </dd>
- <dt><samp class="option">segment_list <var class="var">name</var></samp></dt>
- <dd><p>Generate also a listfile named <var class="var">name</var>. If not specified no
- listfile is generated.
- </p>
- </dd>
- <dt><samp class="option">segment_list_flags <var class="var">flags</var></samp></dt>
- <dd><p>Set flags affecting the segment list generation.
- </p>
- <p>It currently supports the following flags:
- </p><dl class="table">
- <dt>‘<samp class="samp">cache</samp>’</dt>
- <dd><p>Allow caching (only affects M3U8 list files).
- </p>
- </dd>
- <dt>‘<samp class="samp">live</samp>’</dt>
- <dd><p>Allow live-friendly file generation.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">segment_list_size <var class="var">size</var></samp></dt>
- <dd><p>Update the list file so that it contains at most <var class="var">size</var>
- segments. If 0 the list file will contain all the segments. Default
- value is 0.
- </p>
- </dd>
- <dt><samp class="option">segment_list_entry_prefix <var class="var">prefix</var></samp></dt>
- <dd><p>Prepend <var class="var">prefix</var> to each entry. Useful to generate absolute paths.
- By default no prefix is applied.
- </p>
- </dd>
- <dt><samp class="option">segment_list_type <var class="var">type</var></samp></dt>
- <dd><p>Select the listing format.
- </p>
- <p>The following values are recognized:
- </p><dl class="table">
- <dt>‘<samp class="samp">flat</samp>’</dt>
- <dd><p>Generate a flat list for the created segments, one segment per line.
- </p>
- </dd>
- <dt>‘<samp class="samp">csv, ext</samp>’</dt>
- <dd><p>Generate a list for the created segments, one segment per line,
- each line matching the format (comma-separated values):
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">segment_filename</var>,<var class="var">segment_start_time</var>,<var class="var">segment_end_time</var>
- </pre></div>
- <p><var class="var">segment_filename</var> is the name of the output file generated by the
- muxer according to the provided pattern. CSV escaping (according to
- RFC4180) is applied if required.
- </p>
- <p><var class="var">segment_start_time</var> and <var class="var">segment_end_time</var> specify
- the segment start and end time expressed in seconds.
- </p>
- <p>A list file with the suffix <code class="code">".csv"</code> or <code class="code">".ext"</code> will
- auto-select this format.
- </p>
- <p>‘<samp class="samp">ext</samp>’ is deprecated in favor or ‘<samp class="samp">csv</samp>’.
- </p>
- </dd>
- <dt>‘<samp class="samp">ffconcat</samp>’</dt>
- <dd><p>Generate an ffconcat file for the created segments. The resulting file
- can be read using the FFmpeg <a class="ref" href="#concat">concat</a> demuxer.
- </p>
- <p>A list file with the suffix <code class="code">".ffcat"</code> or <code class="code">".ffconcat"</code> will
- auto-select this format.
- </p>
- </dd>
- <dt>‘<samp class="samp">m3u8</samp>’</dt>
- <dd><p>Generate an extended M3U8 file, version 3, compliant with
- <a class="url" href="http://tools.ietf.org/id/draft-pantos-http-live-streaming">http://tools.ietf.org/id/draft-pantos-http-live-streaming</a>.
- </p>
- <p>A list file with the suffix <code class="code">".m3u8"</code> will auto-select this format.
- </p></dd>
- </dl>
- <p>If not specified the type is guessed from the list file name suffix.
- </p>
- </dd>
- <dt><samp class="option">segment_time <var class="var">time</var></samp></dt>
- <dd><p>Set segment duration to <var class="var">time</var>, the value must be a duration
- specification. Default value is "2". See also the
- <samp class="option">segment_times</samp> option.
- </p>
- <p>Note that splitting may not be accurate, unless you force the
- reference stream key-frames at the given time. See the introductory
- notice and the examples below.
- </p>
- </dd>
- <dt><samp class="option">min_seg_duration <var class="var">time</var></samp></dt>
- <dd><p>Set minimum segment duration to <var class="var">time</var>, the value must be a duration
- specification. This prevents the muxer ending segments at a duration below
- this value. Only effective with <code class="code">segment_time</code>. Default value is "0".
- </p>
- </dd>
- <dt><samp class="option">segment_atclocktime <var class="var">1|0</var></samp></dt>
- <dd><p>If set to "1" split at regular clock time intervals starting from 00:00
- o’clock. The <var class="var">time</var> value specified in <samp class="option">segment_time</samp> is
- used for setting the length of the splitting interval.
- </p>
- <p>For example with <samp class="option">segment_time</samp> set to "900" this makes it possible
- to create files at 12:00 o’clock, 12:15, 12:30, etc.
- </p>
- <p>Default value is "0".
- </p>
- </dd>
- <dt><samp class="option">segment_clocktime_offset <var class="var">duration</var></samp></dt>
- <dd><p>Delay the segment splitting times with the specified duration when using
- <samp class="option">segment_atclocktime</samp>.
- </p>
- <p>For example with <samp class="option">segment_time</samp> set to "900" and
- <samp class="option">segment_clocktime_offset</samp> set to "300" this makes it possible to
- create files at 12:05, 12:20, 12:35, etc.
- </p>
- <p>Default value is "0".
- </p>
- </dd>
- <dt><samp class="option">segment_clocktime_wrap_duration <var class="var">duration</var></samp></dt>
- <dd><p>Force the segmenter to only start a new segment if a packet reaches the muxer
- within the specified duration after the segmenting clock time. This way you
- can make the segmenter more resilient to backward local time jumps, such as
- leap seconds or transition to standard time from daylight savings time.
- </p>
- <p>Default is the maximum possible duration which means starting a new segment
- regardless of the elapsed time since the last clock time.
- </p>
- </dd>
- <dt><samp class="option">segment_time_delta <var class="var">delta</var></samp></dt>
- <dd><p>Specify the accuracy time when selecting the start time for a
- segment, expressed as a duration specification. Default value is "0".
- </p>
- <p>When delta is specified a key-frame will start a new segment if its
- PTS satisfies the relation:
- </p><div class="example">
- <pre class="example-preformatted">PTS >= start_time - time_delta
- </pre></div>
- <p>This option is useful when splitting video content, which is always
- split at GOP boundaries, in case a key frame is found just before the
- specified split time.
- </p>
- <p>In particular may be used in combination with the <samp class="file">ffmpeg</samp> option
- <var class="var">force_key_frames</var>. The key frame times specified by
- <var class="var">force_key_frames</var> may not be set accurately because of rounding
- issues, with the consequence that a key frame time may result set just
- before the specified time. For constant frame rate videos a value of
- 1/(2*<var class="var">frame_rate</var>) should address the worst case mismatch between
- the specified time and the time set by <var class="var">force_key_frames</var>.
- </p>
- </dd>
- <dt><samp class="option">segment_times <var class="var">times</var></samp></dt>
- <dd><p>Specify a list of split points. <var class="var">times</var> contains a list of comma
- separated duration specifications, in increasing order. See also
- the <samp class="option">segment_time</samp> option.
- </p>
- </dd>
- <dt><samp class="option">segment_frames <var class="var">frames</var></samp></dt>
- <dd><p>Specify a list of split video frame numbers. <var class="var">frames</var> contains a
- list of comma separated integer numbers, in increasing order.
- </p>
- <p>This option specifies to start a new segment whenever a reference
- stream key frame is found and the sequential number (starting from 0)
- of the frame is greater or equal to the next value in the list.
- </p>
- </dd>
- <dt><samp class="option">segment_wrap <var class="var">limit</var></samp></dt>
- <dd><p>Wrap around segment index once it reaches <var class="var">limit</var>.
- </p>
- </dd>
- <dt><samp class="option">segment_start_number <var class="var">number</var></samp></dt>
- <dd><p>Set the sequence number of the first segment. Defaults to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">strftime <var class="var">1|0</var></samp></dt>
- <dd><p>Use the <code class="code">strftime</code> function to define the name of the new
- segments to write. If this is selected, the output segment name must
- contain a <code class="code">strftime</code> function template. Default value is
- <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">break_non_keyframes <var class="var">1|0</var></samp></dt>
- <dd><p>If enabled, allow segments to start on frames other than keyframes. This
- improves behavior on some players when the time between keyframes is
- inconsistent, but may make things worse on others, and can cause some oddities
- during seeking. Defaults to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">reset_timestamps <var class="var">1|0</var></samp></dt>
- <dd><p>Reset timestamps at the beginning of each segment, so that each segment
- will start with near-zero timestamps. It is meant to ease the playback
- of the generated segments. May not work with some combinations of
- muxers/codecs. It is set to <code class="code">0</code> by default.
- </p>
- </dd>
- <dt><samp class="option">initial_offset <var class="var">offset</var></samp></dt>
- <dd><p>Specify timestamp offset to apply to the output packet timestamps. The
- argument must be a time duration specification, and defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">write_empty_segments <var class="var">1|0</var></samp></dt>
- <dd><p>If enabled, write an empty segment if there are no packets during the period a
- segment would usually span. Otherwise, the segment will be filled with the next
- packet written. Defaults to <code class="code">0</code>.
- </p></dd>
- </dl>
- <p>Make sure to require a closed GOP when encoding and to set the GOP
- size to fit your segment time constraint.
- </p>
- <a name="Examples-25"></a>
- <h4 class="subsection">21.69.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-25" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-25" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Remux the content of file <samp class="file">in.mkv</samp> to a list of segments
- <samp class="file">out-000.nut</samp>, <samp class="file">out-001.nut</samp>, etc., and write the list of
- generated segments to <samp class="file">out.list</samp>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -codec hevc -flags +cgop -g 60 -map 0 -f segment -segment_list out.list out%03d.nut
- </pre></div>
- </li><li>Segment input and set output format options for the output segments:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -f segment -segment_time 10 -segment_format_options movflags=+faststart out%03d.mp4
- </pre></div>
- </li><li>Segment the input file according to the split points specified by the
- <var class="var">segment_times</var> option:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 out%03d.nut
- </pre></div>
- </li><li>Use the <code class="command">ffmpeg</code> <samp class="option">force_key_frames</samp>
- option to force key frames in the input at the specified location, together
- with the segment option <samp class="option">segment_time_delta</samp> to account for
- possible roundings operated when setting key frame times.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le -map 0 \
- -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut
- </pre></div>
- <p>In order to force key frames on the input file, transcoding is
- required.
- </p>
- </li><li>Segment the input file by splitting the input file according to the
- frame numbers sequence specified with the <samp class="option">segment_frames</samp> option:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut
- </pre></div>
- </li><li>Convert the <samp class="file">in.mkv</samp> to TS segments using the <code class="code">libx264</code>
- and <code class="code">aac</code> encoders:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts
- </pre></div>
- </li><li>Segment the input file, and create an M3U8 live playlist (can be used
- as live HLS source):
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segment_list playlist.m3u8 \
- -segment_list_flags +live -segment_time 10 out%03d.mkv
- </pre></div>
- </li></ul>
- <a name="smoothstreaming"></a>
- <h3 class="section">21.70 smoothstreaming<span class="pull-right"><a class="anchor hidden-xs" href="#smoothstreaming" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-smoothstreaming" aria-hidden="true">TOC</a></span></h3>
- <p>Smooth Streaming muxer generates a set of files (Manifest, chunks) suitable for serving with conventional web server.
- </p>
- <dl class="table">
- <dt><samp class="option">window_size</samp></dt>
- <dd><p>Specify the number of fragments kept in the manifest. Default 0 (keep all).
- </p>
- </dd>
- <dt><samp class="option">extra_window_size</samp></dt>
- <dd><p>Specify the number of fragments kept outside of the manifest before removing from disk. Default 5.
- </p>
- </dd>
- <dt><samp class="option">lookahead_count</samp></dt>
- <dd><p>Specify the number of lookahead fragments. Default 2.
- </p>
- </dd>
- <dt><samp class="option">min_frag_duration</samp></dt>
- <dd><p>Specify the minimum fragment duration (in microseconds). Default 5000000.
- </p>
- </dd>
- <dt><samp class="option">remove_at_exit</samp></dt>
- <dd><p>Specify whether to remove all fragments when finished. Default 0 (do not remove).
- </p>
- </dd>
- </dl>
- <a class="anchor" id="streamhash"></a><a name="streamhash-1"></a>
- <h3 class="section">21.71 streamhash<span class="pull-right"><a class="anchor hidden-xs" href="#streamhash-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-streamhash-1" aria-hidden="true">TOC</a></span></h3>
- <p>Per stream hash testing format.
- </p>
- <p>This muxer computes and prints a cryptographic hash of all the input frames,
- on a per-stream basis. This can be used for equality checks without having
- to do a complete binary comparison.
- </p>
- <p>By default audio frames are converted to signed 16-bit raw audio and
- video frames to raw video before computing the hash, but the output
- of explicit conversions to other codecs can also be used. Timestamps
- are ignored. It uses the SHA-256 cryptographic hash function by default,
- but supports several other algorithms.
- </p>
- <p>The output of the muxer consists of one line per stream of the form:
- <var class="var">streamindex</var>,<var class="var">streamtype</var>,<var class="var">algo</var>=<var class="var">hash</var>, where
- <var class="var">streamindex</var> is the index of the mapped stream, <var class="var">streamtype</var> is a
- single character indicating the type of stream, <var class="var">algo</var> is a short string
- representing the hash function used, and <var class="var">hash</var> is a hexadecimal number
- representing the computed hash.
- </p>
- <dl class="table">
- <dt><samp class="option">hash <var class="var">algorithm</var></samp></dt>
- <dd><p>Use the cryptographic hash function specified by the string <var class="var">algorithm</var>.
- Supported values include <code class="code">MD5</code>, <code class="code">murmur3</code>, <code class="code">RIPEMD128</code>,
- <code class="code">RIPEMD160</code>, <code class="code">RIPEMD256</code>, <code class="code">RIPEMD320</code>, <code class="code">SHA160</code>,
- <code class="code">SHA224</code>, <code class="code">SHA256</code> (default), <code class="code">SHA512/224</code>, <code class="code">SHA512/256</code>,
- <code class="code">SHA384</code>, <code class="code">SHA512</code>, <code class="code">CRC32</code> and <code class="code">adler32</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-26"></a>
- <h4 class="subsection">21.71.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-26" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-26" aria-hidden="true">TOC</a></span></h4>
- <p>To compute the SHA-256 hash of the input converted to raw audio and
- video, and store it in the file <samp class="file">out.sha256</samp>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f streamhash out.sha256
- </pre></div>
- <p>To print an MD5 hash to stdout use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f streamhash -hash md5 -
- </pre></div>
- <p>See also the <a class="ref" href="#hash">hash</a> and <a class="ref" href="#framehash">framehash</a> muxers.
- </p>
- <a class="anchor" id="tee"></a><a name="tee-1"></a>
- <h3 class="section">21.72 tee<span class="pull-right"><a class="anchor hidden-xs" href="#tee-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tee-1" aria-hidden="true">TOC</a></span></h3>
- <p>The tee muxer can be used to write the same data to several outputs, such as files or streams.
- It can be used, for example, to stream a video over a network and save it to disk at the same time.
- </p>
- <p>It is different from specifying several outputs to the <code class="command">ffmpeg</code>
- command-line tool. With the tee muxer, the audio and video data will be encoded only once.
- With conventional multiple outputs, multiple encoding operations in parallel are initiated,
- which can be a very expensive process. The tee muxer is not useful when using the libavformat API
- directly because it is then possible to feed the same packets to several muxers directly.
- </p>
- <p>Since the tee muxer does not represent any particular output format, ffmpeg cannot auto-select
- output streams. So all streams intended for output must be specified using <code class="code">-map</code>. See
- the examples below.
- </p>
- <p>Some encoders may need different options depending on the output format;
- the auto-detection of this can not work with the tee muxer, so they need to be explicitly specified.
- The main example is the <samp class="option">global_header</samp> flag.
- </p>
- <p>The slave outputs are specified in the file name given to the muxer,
- separated by ’|’. If any of the slave name contains the ’|’ separator,
- leading or trailing spaces or any special character, those must be
- escaped (see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#quoting_005fand_005fescaping">the "Quoting and escaping"
- section in the ffmpeg-utils(1) manual</a>).
- </p>
- <a name="Options-90"></a>
- <h4 class="subsection">21.72.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-90" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-90" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">use_fifo <var class="var">bool</var></samp></dt>
- <dd><p>If set to 1, slave outputs will be processed in separate threads using the <a class="ref" href="#fifo">fifo</a>
- muxer. This allows to compensate for different speed/latency/reliability of
- outputs and setup transparent recovery. By default this feature is turned off.
- </p>
- </dd>
- <dt><samp class="option">fifo_options</samp></dt>
- <dd><p>Options to pass to fifo pseudo-muxer instances. See <a class="ref" href="#fifo">fifo</a>.
- </p>
- </dd>
- </dl>
- <p>Muxer options can be specified for each slave by prepending them as a list of
- <var class="var">key</var>=<var class="var">value</var> pairs separated by ’:’, between square brackets. If
- the options values contain a special character or the ’:’ separator, they
- must be escaped; note that this is a second level escaping.
- </p>
- <p>The following special options are also recognized:
- </p><dl class="table">
- <dt><samp class="option">f</samp></dt>
- <dd><p>Specify the format name. Required if it cannot be guessed from the
- output URL.
- </p>
- </dd>
- <dt><samp class="option">bsfs[/<var class="var">spec</var>]</samp></dt>
- <dd><p>Specify a list of bitstream filters to apply to the specified
- output.
- </p>
- <p>It is possible to specify to which streams a given bitstream filter
- applies, by appending a stream specifier to the option separated by
- <code class="code">/</code>. <var class="var">spec</var> must be a stream specifier (see <a class="ref" href="#Format-stream-specifiers">Format stream specifiers</a>).
- </p>
- <p>If the stream specifier is not specified, the bitstream filters will be
- applied to all streams in the output. This will cause that output operation
- to fail if the output contains streams to which the bitstream filter cannot
- be applied e.g. <code class="code">h264_mp4toannexb</code> being applied to an output containing an audio stream.
- </p>
- <p>Options for a bitstream filter must be specified in the form of <code class="code">opt=value</code>.
- </p>
- <p>Several bitstream filters can be specified, separated by ",".
- </p>
- </dd>
- <dt><samp class="option">use_fifo <var class="var">bool</var></samp></dt>
- <dd><p>This allows to override tee muxer use_fifo option for individual slave muxer.
- </p>
- </dd>
- <dt><samp class="option">fifo_options</samp></dt>
- <dd><p>This allows to override tee muxer fifo_options for individual slave muxer.
- See <a class="ref" href="#fifo">fifo</a>.
- </p>
- </dd>
- <dt><samp class="option">select</samp></dt>
- <dd><p>Select the streams that should be mapped to the slave output,
- specified by a stream specifier. If not specified, this defaults to
- all the mapped streams. This will cause that output operation to fail
- if the output format does not accept all mapped streams.
- </p>
- <p>You may use multiple stream specifiers separated by commas (<code class="code">,</code>) e.g.: <code class="code">a:0,v</code>
- </p>
- </dd>
- <dt><samp class="option">onfail</samp></dt>
- <dd><p>Specify behaviour on output failure. This can be set to either <code class="code">abort</code> (which is
- default) or <code class="code">ignore</code>. <code class="code">abort</code> will cause whole process to fail in case of failure
- on this slave output. <code class="code">ignore</code> will ignore failure on this output, so other outputs
- will continue without being affected.
- </p></dd>
- </dl>
- <a name="Examples-27"></a>
- <h4 class="subsection">21.72.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-27" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-27" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Encode something and both archive it in a WebM file and stream it
- as MPEG-TS over UDP:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
- "archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
- </pre></div>
- </li><li>As above, but continue streaming even if output to local file fails
- (for example local drive fills up):
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
- "[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to encode the input, and send the output
- to three different destinations. The <code class="code">dump_extra</code> bitstream
- filter is used to add extradata information to all the output video
- keyframes packets, as requested by the MPEG-TS format. The select
- option is applied to <samp class="file">out.aac</samp> in order to make it contain only
- audio packets.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
- -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"
- </pre></div>
- </li><li>As above, but select only stream <code class="code">a:1</code> for the audio output. Note
- that a second level escaping must be performed, as ":" is a special
- character used to separate options.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
- -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"
- </pre></div>
- </li></ul>
- <a name="webm_005fchunk"></a>
- <h3 class="section">21.73 webm_chunk<span class="pull-right"><a class="anchor hidden-xs" href="#webm_005fchunk" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-webm_005fchunk" aria-hidden="true">TOC</a></span></h3>
- <p>WebM Live Chunk Muxer.
- </p>
- <p>This muxer writes out WebM headers and chunks as separate files which can be
- consumed by clients that support WebM Live streams via DASH.
- </p>
- <a name="Options-91"></a>
- <h4 class="subsection">21.73.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-91" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-91" aria-hidden="true">TOC</a></span></h4>
- <p>This muxer supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">chunk_start_index</samp></dt>
- <dd><p>Index of the first chunk (defaults to 0).
- </p>
- </dd>
- <dt><samp class="option">header</samp></dt>
- <dd><p>Filename of the header where the initialization data will be written.
- </p>
- </dd>
- <dt><samp class="option">audio_chunk_duration</samp></dt>
- <dd><p>Duration of each audio chunk in milliseconds (defaults to 5000).
- </p></dd>
- </dl>
- <a name="Example-9"></a>
- <h4 class="subsection">21.73.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-9" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-9" aria-hidden="true">TOC</a></span></h4>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f v4l2 -i /dev/video0 \
- -f alsa -i hw:0 \
- -map 0:0 \
- -c:v libvpx-vp9 \
- -s 640x360 -keyint_min 30 -g 30 \
- -f webm_chunk \
- -header webm_live_video_360.hdr \
- -chunk_start_index 1 \
- webm_live_video_360_%d.chk \
- -map 1:0 \
- -c:a libvorbis \
- -b:a 128k \
- -f webm_chunk \
- -header webm_live_audio_128.hdr \
- -chunk_start_index 1 \
- -audio_chunk_duration 1000 \
- webm_live_audio_128_%d.chk
- </pre></div>
- <a name="webm_005fdash_005fmanifest"></a>
- <h3 class="section">21.74 webm_dash_manifest<span class="pull-right"><a class="anchor hidden-xs" href="#webm_005fdash_005fmanifest" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-webm_005fdash_005fmanifest" aria-hidden="true">TOC</a></span></h3>
- <p>WebM DASH Manifest muxer.
- </p>
- <p>This muxer implements the WebM DASH Manifest specification to generate the DASH
- manifest XML. It also supports manifest generation for DASH live streams.
- </p>
- <p>For more information see:
- </p>
- <ul class="itemize mark-bullet">
- <li>WebM DASH Specification: <a class="url" href="https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification">https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification</a>
- </li><li>ISO DASH Specification: <a class="url" href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip</a>
- </li></ul>
- <a name="Options-92"></a>
- <h4 class="subsection">21.74.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-92" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-92" aria-hidden="true">TOC</a></span></h4>
- <p>This muxer supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">adaptation_sets</samp></dt>
- <dd><p>This option has the following syntax: "id=x,streams=a,b,c id=y,streams=d,e" where x and y are the
- unique identifiers of the adaptation sets and a,b,c,d and e are the indices of the corresponding
- audio and video streams. Any number of adaptation sets can be added using this option.
- </p>
- </dd>
- <dt><samp class="option">live</samp></dt>
- <dd><p>Set this to 1 to create a live stream DASH Manifest. Default: 0.
- </p>
- </dd>
- <dt><samp class="option">chunk_start_index</samp></dt>
- <dd><p>Start index of the first chunk. This will go in the ‘<samp class="samp">startNumber</samp>’ attribute
- of the ‘<samp class="samp">SegmentTemplate</samp>’ element in the manifest. Default: 0.
- </p>
- </dd>
- <dt><samp class="option">chunk_duration_ms</samp></dt>
- <dd><p>Duration of each chunk in milliseconds. This will go in the ‘<samp class="samp">duration</samp>’
- attribute of the ‘<samp class="samp">SegmentTemplate</samp>’ element in the manifest. Default: 1000.
- </p>
- </dd>
- <dt><samp class="option">utc_timing_url</samp></dt>
- <dd><p>URL of the page that will return the UTC timestamp in ISO format. This will go
- in the ‘<samp class="samp">value</samp>’ attribute of the ‘<samp class="samp">UTCTiming</samp>’ element in the manifest.
- Default: None.
- </p>
- </dd>
- <dt><samp class="option">time_shift_buffer_depth</samp></dt>
- <dd><p>Smallest time (in seconds) shifting buffer for which any Representation is
- guaranteed to be available. This will go in the ‘<samp class="samp">timeShiftBufferDepth</samp>’
- attribute of the ‘<samp class="samp">MPD</samp>’ element. Default: 60.
- </p>
- </dd>
- <dt><samp class="option">minimum_update_period</samp></dt>
- <dd><p>Minimum update period (in seconds) of the manifest. This will go in the
- ‘<samp class="samp">minimumUpdatePeriod</samp>’ attribute of the ‘<samp class="samp">MPD</samp>’ element. Default: 0.
- </p>
- </dd>
- </dl>
- <a name="Example-10"></a>
- <h4 class="subsection">21.74.2 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-10" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-10" aria-hidden="true">TOC</a></span></h4>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f webm_dash_manifest -i video1.webm \
- -f webm_dash_manifest -i video2.webm \
- -f webm_dash_manifest -i audio1.webm \
- -f webm_dash_manifest -i audio2.webm \
- -map 0 -map 1 -map 2 -map 3 \
- -c copy \
- -f webm_dash_manifest \
- -adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
- manifest.xml
- </pre></div>
- <a class="anchor" id="whip"></a><a name="whip-1"></a>
- <h3 class="section">21.75 whip<span class="pull-right"><a class="anchor hidden-xs" href="#whip-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-whip-1" aria-hidden="true">TOC</a></span></h3>
- <p>WebRTC (Real-Time Communication) muxer that supports sub-second latency streaming according to
- the WHIP (WebRTC-HTTP ingestion protocol) specification.
- </p>
- <p>This is an experimental feature.
- </p>
- <p>It uses HTTP as a signaling protocol to exchange SDP capabilities and ICE lite candidates. Then,
- it uses STUN binding requests and responses to establish a session over UDP. Subsequently, it
- initiates a DTLS handshake to exchange the SRTP encryption keys. Lastly, it splits video and
- audio frames into RTP packets and encrypts them using SRTP.
- </p>
- <p>Ensure that you use H.264 without B frames and Opus for the audio codec. For example, to convert
- an input file with <code class="command">ffmpeg</code> to WebRTC:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i input.mp4 -acodec libopus -ar 48000 -ac 2 \
- -vcodec libx264 -profile:v baseline -tune zerolatency -threads 1 -bf 0 \
- -f whip "http://localhost:1985/rtc/v1/whip/?app=live&stream=livestream"
- </pre></div>
- <p>For this example, we have employed low latency options, resulting in an end-to-end latency of
- approximately 150ms.
- </p>
- <a name="Options-93"></a>
- <h4 class="subsection">21.75.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-93" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-93" aria-hidden="true">TOC</a></span></h4>
- <p>This muxer supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">handshake_timeout <var class="var">integer</var></samp></dt>
- <dd><p>Set the timeout in milliseconds for ICE and DTLS handshake.
- Default value is 5000.
- </p>
- </dd>
- <dt><samp class="option">pkt_size <var class="var">integer</var></samp></dt>
- <dd><p>Set the maximum size, in bytes, of RTP packets that send out.
- Default value is 1200.
- </p>
- </dd>
- <dt><samp class="option">ts_buffer_size <var class="var">integer</var></samp></dt>
- <dd><p>Set the buffer size, in bytes, of underlying protocol.
- Default value is -1(auto). The UDP auto selects a reasonable value.
- </p>
- </dd>
- <dt><samp class="option">whip_flags <var class="var">flags</var></samp></dt>
- <dd><p>Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">dtls_active</samp>’</dt>
- <dd><p>The muxer will try to set dtls active role and send the first client hello.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">authorization <var class="var">string</var></samp></dt>
- <dd><p>The optional Bearer token for WHIP Authorization.
- </p>
- </dd>
- <dt><samp class="option">cert_file <var class="var">string</var></samp></dt>
- <dd><p>The optional certificate file path for DTLS.
- </p>
- </dd>
- <dt><samp class="option">key_file <var class="var">string</var></samp></dt>
- <dd><p>The optional private key file path for DTLS.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="metadata"></a><a name="Metadata-2"></a>
- <h2 class="chapter">22 Metadata<span class="pull-right"><a class="anchor hidden-xs" href="#Metadata-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Metadata-2" aria-hidden="true">TOC</a></span></h2>
- <p>FFmpeg is able to dump metadata from media files into a simple UTF-8-encoded
- INI-like text file and then load it back using the metadata muxer/demuxer.
- </p>
- <p>The file format is as follows:
- </p><ol class="enumerate">
- <li> A file consists of a header and a number of metadata tags divided into sections,
- each on its own line.
- </li><li> The header is a ‘<samp class="samp">;FFMETADATA</samp>’ string, followed by a version number (now 1).
- </li><li> Metadata tags are of the form ‘<samp class="samp">key=value</samp>’
- </li><li> Immediately after header follows global metadata
- </li><li> After global metadata there may be sections with per-stream/per-chapter
- metadata.
- </li><li> A section starts with the section name in uppercase (i.e. STREAM or CHAPTER) in
- brackets (‘<samp class="samp">[</samp>’, ‘<samp class="samp">]</samp>’) and ends with next section or end of file.
- </li><li> At the beginning of a chapter section there may be an optional timebase to be
- used for start/end values. It must be in form
- ‘<samp class="samp">TIMEBASE=<var class="var">num</var>/<var class="var">den</var></samp>’, where <var class="var">num</var> and <var class="var">den</var> are
- integers. If the timebase is missing then start/end times are assumed to
- be in nanoseconds.
- <p>Next a chapter section must contain chapter start and end times in form
- ‘<samp class="samp">START=<var class="var">num</var></samp>’, ‘<samp class="samp">END=<var class="var">num</var></samp>’, where <var class="var">num</var> is a positive
- integer.
- </p>
- </li><li> Empty lines and lines starting with ‘<samp class="samp">;</samp>’ or ‘<samp class="samp">#</samp>’ are ignored.
- </li><li> Metadata keys or values containing special characters (‘<samp class="samp">=</samp>’, ‘<samp class="samp">;</samp>’,
- ‘<samp class="samp">#</samp>’, ‘<samp class="samp">\</samp>’ and a newline) must be escaped with a backslash ‘<samp class="samp">\</samp>’.
- </li><li> Note that whitespace in metadata (e.g. ‘<samp class="samp">foo = bar</samp>’) is considered to be
- a part of the tag (in the example above key is ‘<samp class="samp">foo </samp>’, value is
- ‘<samp class="samp"> bar</samp>’).
- </li></ol>
- <p>A ffmetadata file might look like this:
- </p><div class="example">
- <pre class="example-preformatted">;FFMETADATA1
- title=bike\\shed
- ;this is a comment
- artist=FFmpeg troll team
- [CHAPTER]
- TIMEBASE=1/1000
- START=0
- #chapter ends at 0:01:00
- END=60000
- title=chapter \#1
- [STREAM]
- title=multi\
- line
- </pre></div>
- <p>By using the ffmetadata muxer and demuxer it is possible to extract
- metadata from an input file to an ffmetadata file, and then transcode
- the file into an output file with the edited ffmetadata file.
- </p>
- <p>Extracting an ffmetadata file with <samp class="file">ffmpeg</samp> goes as follows:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE
- </pre></div>
- <p>Reinserting edited metadata information from the FFMETADATAFILE file can
- be done as:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec copy OUTPUT
- </pre></div>
- <a name="Protocol-Options"></a>
- <h2 class="chapter">23 Protocol Options<span class="pull-right"><a class="anchor hidden-xs" href="#Protocol-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Protocol-Options" aria-hidden="true">TOC</a></span></h2>
- <p>The libavformat library provides some generic global options, which
- can be set on all the protocols. In addition each protocol may support
- so-called private options, which are specific for that component.
- </p>
- <p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
- FFmpeg tools, or by setting the value explicitly in the
- <code class="code">AVFormatContext</code> options or using the <samp class="file">libavutil/opt.h</samp> API
- for programmatic use.
- </p>
- <p>The list of supported options follows:
- </p>
- <dl class="table">
- <dt><samp class="option">protocol_whitelist <var class="var">list</var> (<em class="emph">input</em>)</samp></dt>
- <dd><p>Set a ","-separated list of allowed protocols. "ALL" matches all protocols. Protocols
- prefixed by "-" are disabled.
- All protocols are allowed by default but protocols used by an another
- protocol (nested protocols) are restricted to a per protocol subset.
- </p></dd>
- </dl>
- <a name="Protocols"></a>
- <h2 class="chapter">24 Protocols<span class="pull-right"><a class="anchor hidden-xs" href="#Protocols" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Protocols" aria-hidden="true">TOC</a></span></h2>
- <p>Protocols are configured elements in FFmpeg that enable access to
- resources that require specific protocols.
- </p>
- <p>When you configure your FFmpeg build, all the supported protocols are
- enabled by default. You can list all available ones using the
- configure option "–list-protocols".
- </p>
- <p>You can disable all the protocols using the configure option
- "–disable-protocols", and selectively enable a protocol using the
- option "–enable-protocol=<var class="var">PROTOCOL</var>", or you can disable a
- particular protocol using the option
- "–disable-protocol=<var class="var">PROTOCOL</var>".
- </p>
- <p>The option "-protocols" of the ff* tools will display the list of
- supported protocols.
- </p>
- <p>All protocols accept the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rw_timeout</samp></dt>
- <dd><p>Maximum time to wait for (network) read/write operations to complete,
- in microseconds.
- </p></dd>
- </dl>
- <p>A description of the currently available protocols follows.
- </p>
- <a name="amqp"></a>
- <h3 class="section">24.1 amqp<span class="pull-right"><a class="anchor hidden-xs" href="#amqp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amqp" aria-hidden="true">TOC</a></span></h3>
- <p>Advanced Message Queueing Protocol (AMQP) version 0-9-1 is a broker based
- publish-subscribe communication protocol.
- </p>
- <p>FFmpeg must be compiled with –enable-librabbitmq to support AMQP. A separate
- AMQP broker must also be run. An example open-source AMQP broker is RabbitMQ.
- </p>
- <p>After starting the broker, an FFmpeg client may stream data to the broker using
- the command:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i input -f mpegts amqp://[[user]:[password]@]hostname[:port][/vhost]
- </pre></div>
- <p>Where hostname and port (default is 5672) is the address of the broker. The
- client may also set a user/password for authentication. The default for both
- fields is "guest". Name of virtual host on broker can be set with vhost. The
- default value is "/".
- </p>
- <p>Multiple subscribers may stream from the broker using the command:
- </p><div class="example">
- <pre class="example-preformatted">ffplay amqp://[[user]:[password]@]hostname[:port][/vhost]
- </pre></div>
- <p>In RabbitMQ all data published to the broker flows through a specific exchange,
- and each subscribing client has an assigned queue/buffer. When a packet arrives
- at an exchange, it may be copied to a client’s queue depending on the exchange
- and routing_key fields.
- </p>
- <p>The following options are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">exchange</samp></dt>
- <dd><p>Sets the exchange to use on the broker. RabbitMQ has several predefined
- exchanges: "amq.direct" is the default exchange, where the publisher and
- subscriber must have a matching routing_key; "amq.fanout" is the same as a
- broadcast operation (i.e. the data is forwarded to all queues on the fanout
- exchange independent of the routing_key); and "amq.topic" is similar to
- "amq.direct", but allows for more complex pattern matching (refer to the RabbitMQ
- documentation).
- </p>
- </dd>
- <dt><samp class="option">routing_key</samp></dt>
- <dd><p>Sets the routing key. The default value is "amqp". The routing key is used on
- the "amq.direct" and "amq.topic" exchanges to decide whether packets are written
- to the queue of a subscriber.
- </p>
- </dd>
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>Maximum size of each packet sent/received to the broker. Default is 131072.
- Minimum is 4096 and max is any large value (representable by an int). When
- receiving packets, this sets an internal buffer size in FFmpeg. It should be
- equal to or greater than the size of the published packets to the broker. Otherwise
- the received message may be truncated causing decoding errors.
- </p>
- </dd>
- <dt><samp class="option">connection_timeout</samp></dt>
- <dd><p>The timeout in seconds during the initial connection to the broker. The
- default value is rw_timeout, or 5 seconds if rw_timeout is not set.
- </p>
- </dd>
- <dt><samp class="option">delivery_mode <var class="var">mode</var></samp></dt>
- <dd><p>Sets the delivery mode of each message sent to broker.
- The following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">persistent</samp>’</dt>
- <dd><p>Delivery mode set to "persistent" (2). This is the default value.
- Messages may be written to the broker’s disk depending on its setup.
- </p>
- </dd>
- <dt>‘<samp class="samp">non-persistent</samp>’</dt>
- <dd><p>Delivery mode set to "non-persistent" (1).
- Messages will stay in broker’s memory unless the broker is under memory
- pressure.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="async"></a>
- <h3 class="section">24.2 async<span class="pull-right"><a class="anchor hidden-xs" href="#async" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-async" aria-hidden="true">TOC</a></span></h3>
- <p>Asynchronous data filling wrapper for input stream.
- </p>
- <p>Fill data in a background thread, to decouple I/O operation from demux thread.
- </p>
- <div class="example">
- <pre class="example-preformatted">async:<var class="var">URL</var>
- async:http://host/resource
- async:cache:http://host/resource
- </pre></div>
- <a name="bluray"></a>
- <h3 class="section">24.3 bluray<span class="pull-right"><a class="anchor hidden-xs" href="#bluray" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bluray" aria-hidden="true">TOC</a></span></h3>
- <p>Read BluRay playlist.
- </p>
- <p>The accepted options are:
- </p><dl class="table">
- <dt><samp class="option">angle</samp></dt>
- <dd><p>BluRay angle
- </p>
- </dd>
- <dt><samp class="option">chapter</samp></dt>
- <dd><p>Start chapter (1...N)
- </p>
- </dd>
- <dt><samp class="option">playlist</samp></dt>
- <dd><p>Playlist to read (BDMV/PLAYLIST/?????.mpls)
- </p>
- </dd>
- </dl>
- <p>Examples:
- </p>
- <p>Read longest playlist from BluRay mounted to /mnt/bluray:
- </p><div class="example">
- <pre class="example-preformatted">bluray:/mnt/bluray
- </pre></div>
- <p>Read angle 2 of playlist 4 from BluRay mounted to /mnt/bluray, start from chapter 2:
- </p><div class="example">
- <pre class="example-preformatted">-playlist 4 -angle 2 -chapter 2 bluray:/mnt/bluray
- </pre></div>
- <a name="cache"></a>
- <h3 class="section">24.4 cache<span class="pull-right"><a class="anchor hidden-xs" href="#cache" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-cache" aria-hidden="true">TOC</a></span></h3>
- <p>Caching wrapper for input stream.
- </p>
- <p>Cache the input stream to temporary file. It brings seeking capability to live streams.
- </p>
- <p>The accepted options are:
- </p><dl class="table">
- <dt><samp class="option">read_ahead_limit</samp></dt>
- <dd><p>Amount in bytes that may be read ahead when seeking isn’t supported. Range is -1 to INT_MAX.
- -1 for unlimited. Default is 65536.
- </p>
- </dd>
- </dl>
- <p>URL Syntax is
- </p><div class="example">
- <pre class="example-preformatted">cache:<var class="var">URL</var>
- </pre></div>
- <a name="concat-2"></a>
- <h3 class="section">24.5 concat<span class="pull-right"><a class="anchor hidden-xs" href="#concat-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-concat-2" aria-hidden="true">TOC</a></span></h3>
- <p>Physical concatenation protocol.
- </p>
- <p>Read and seek from many resources in sequence as if they were
- a unique resource.
- </p>
- <p>A URL accepted by this protocol has the syntax:
- </p><div class="example">
- <pre class="example-preformatted">concat:<var class="var">URL1</var>|<var class="var">URL2</var>|...|<var class="var">URLN</var>
- </pre></div>
- <p>where <var class="var">URL1</var>, <var class="var">URL2</var>, ..., <var class="var">URLN</var> are the urls of the
- resource to be concatenated, each one possibly specifying a distinct
- protocol.
- </p>
- <p>For example to read a sequence of files <samp class="file">split1.mpeg</samp>,
- <samp class="file">split2.mpeg</samp>, <samp class="file">split3.mpeg</samp> with <code class="command">ffplay</code> use the
- command:
- </p><div class="example">
- <pre class="example-preformatted">ffplay concat:split1.mpeg\|split2.mpeg\|split3.mpeg
- </pre></div>
- <p>Note that you may need to escape the character "|" which is special for
- many shells.
- </p>
- <a name="concatf"></a>
- <h3 class="section">24.6 concatf<span class="pull-right"><a class="anchor hidden-xs" href="#concatf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-concatf" aria-hidden="true">TOC</a></span></h3>
- <p>Physical concatenation protocol using a line break delimited list of
- resources.
- </p>
- <p>Read and seek from many resources in sequence as if they were
- a unique resource.
- </p>
- <p>A URL accepted by this protocol has the syntax:
- </p><div class="example">
- <pre class="example-preformatted">concatf:<var class="var">URL</var>
- </pre></div>
- <p>where <var class="var">URL</var> is the url containing a line break delimited list of
- resources to be concatenated, each one possibly specifying a distinct
- protocol. Special characters must be escaped with backslash or single
- quotes. See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#quoting_005fand_005fescaping">the "Quoting and escaping"
- section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>For example to read a sequence of files <samp class="file">split1.mpeg</samp>,
- <samp class="file">split2.mpeg</samp>, <samp class="file">split3.mpeg</samp> listed in separate lines within
- a file <samp class="file">split.txt</samp> with <code class="command">ffplay</code> use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffplay concatf:split.txt
- </pre></div>
- <p>Where <samp class="file">split.txt</samp> contains the lines:
- </p><div class="example">
- <pre class="example-preformatted">split1.mpeg
- split2.mpeg
- split3.mpeg
- </pre></div>
- <a name="crypto"></a>
- <h3 class="section">24.7 crypto<span class="pull-right"><a class="anchor hidden-xs" href="#crypto" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-crypto" aria-hidden="true">TOC</a></span></h3>
- <p>AES-encrypted stream reading protocol.
- </p>
- <p>The accepted options are:
- </p><dl class="table">
- <dt><samp class="option">key</samp></dt>
- <dd><p>Set the AES decryption key binary block from given hexadecimal representation.
- </p>
- </dd>
- <dt><samp class="option">iv</samp></dt>
- <dd><p>Set the AES decryption initialization vector binary block from given hexadecimal representation.
- </p></dd>
- </dl>
- <p>Accepted URL formats:
- </p><div class="example">
- <pre class="example-preformatted">crypto:<var class="var">URL</var>
- crypto+<var class="var">URL</var>
- </pre></div>
- <a name="data"></a>
- <h3 class="section">24.8 data<span class="pull-right"><a class="anchor hidden-xs" href="#data" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-data" aria-hidden="true">TOC</a></span></h3>
- <p>Data in-line in the URI. See <a class="url" href="http://en.wikipedia.org/wiki/Data_URI_scheme">http://en.wikipedia.org/wiki/Data_URI_scheme</a>.
- </p>
- <p>For example, to convert a GIF file given inline with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i "data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=" smiley.png
- </pre></div>
- <a name="fd"></a>
- <h3 class="section">24.9 fd<span class="pull-right"><a class="anchor hidden-xs" href="#fd" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fd" aria-hidden="true">TOC</a></span></h3>
- <p>File descriptor access protocol.
- </p>
- <p>The accepted syntax is:
- </p><div class="example">
- <pre class="example-preformatted">fd: -fd <var class="var">file_descriptor</var>
- </pre></div>
- <p>If <samp class="option">fd</samp> is not specified, by default the stdout file descriptor will be
- used for writing, stdin for reading. Unlike the pipe protocol, fd protocol has
- seek support if it corresponding to a regular file. fd protocol doesn’t support
- pass file descriptor via URL for security.
- </p>
- <p>This protocol accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">blocksize</samp></dt>
- <dd><p>Set I/O operation maximum block size, in bytes. Default value is
- <code class="code">INT_MAX</code>, which results in not limiting the requested block size.
- Setting this value reasonably low improves user termination request reaction
- time, which is valuable if data transmission is slow.
- </p>
- </dd>
- <dt><samp class="option">fd</samp></dt>
- <dd><p>Set file descriptor.
- </p></dd>
- </dl>
- <a name="file"></a>
- <h3 class="section">24.10 file<span class="pull-right"><a class="anchor hidden-xs" href="#file" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-file" aria-hidden="true">TOC</a></span></h3>
- <p>File access protocol.
- </p>
- <p>Read from or write to a file.
- </p>
- <p>A file URL can have the form:
- </p><div class="example">
- <pre class="example-preformatted">file:<var class="var">filename</var>
- </pre></div>
- <p>where <var class="var">filename</var> is the path of the file to read.
- </p>
- <p>An URL that does not have a protocol prefix will be assumed to be a
- file URL. Depending on the build, an URL that looks like a Windows
- path with the drive letter at the beginning will also be assumed to be
- a file URL (usually not the case in builds for unix-like systems).
- </p>
- <p>For example to read from a file <samp class="file">input.mpeg</samp> with <code class="command">ffmpeg</code>
- use the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i file:input.mpeg output.mpeg
- </pre></div>
- <p>This protocol accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">truncate</samp></dt>
- <dd><p>Truncate existing files on write, if set to 1. A value of 0 prevents
- truncating. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">blocksize</samp></dt>
- <dd><p>Set I/O operation maximum block size, in bytes. Default value is
- <code class="code">INT_MAX</code>, which results in not limiting the requested block size.
- Setting this value reasonably low improves user termination request reaction
- time, which is valuable for files on slow medium.
- </p>
- </dd>
- <dt><samp class="option">follow</samp></dt>
- <dd><p>If set to 1, the protocol will retry reading at the end of the file, allowing
- reading files that still are being written. In order for this to terminate,
- you either need to use the rw_timeout option, or use the interrupt callback
- (for API users).
- </p>
- </dd>
- <dt><samp class="option">seekable</samp></dt>
- <dd><p>Controls if seekability is advertised on the file. 0 means non-seekable, -1
- means auto (seekable for normal files, non-seekable for named pipes).
- </p>
- <p>Many demuxers handle seekable and non-seekable resources differently,
- overriding this might speed up opening certain files at the cost of losing some
- features (e.g. accurate seeking).
- </p>
- </dd>
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>Set the maximum packet size used for file I/O. A smaller value may reduce
- memory usage. A higher value may increase throughput especially with networked
- filesystems.
- </p>
- <p>For reading, if explicitly set, it overrides the default internal buffer size
- (32 KB) and limits the maximum amount of data read per operation.
- </p>
- <p>For writing, this sets the size of each write operation. The default is 256 KB
- for regular files, 32 KB otherwise.
- </p></dd>
- </dl>
- <a name="ftp"></a>
- <h3 class="section">24.11 ftp<span class="pull-right"><a class="anchor hidden-xs" href="#ftp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ftp" aria-hidden="true">TOC</a></span></h3>
- <p>FTP (File Transfer Protocol).
- </p>
- <p>Read from or write to remote resources using FTP protocol.
- </p>
- <p>Following syntax is required.
- </p><div class="example">
- <pre class="example-preformatted">ftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg
- </pre></div>
- <p>This protocol accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">timeout</samp></dt>
- <dd><p>Set timeout in microseconds of socket I/O operations used by the underlying low level
- operation. By default it is set to -1, which means that the timeout is
- not specified.
- </p>
- </dd>
- <dt><samp class="option">ftp-user</samp></dt>
- <dd><p>Set a user to be used for authenticating to the FTP server. This is overridden by the
- user in the FTP URL.
- </p>
- </dd>
- <dt><samp class="option">ftp-password</samp></dt>
- <dd><p>Set a password to be used for authenticating to the FTP server. This is overridden by
- the password in the FTP URL, or by <samp class="option">ftp-anonymous-password</samp> if no user is set.
- </p>
- </dd>
- <dt><samp class="option">ftp-anonymous-password</samp></dt>
- <dd><p>Password used when login as anonymous user. Typically an e-mail address
- should be used.
- </p>
- </dd>
- <dt><samp class="option">ftp-write-seekable</samp></dt>
- <dd><p>Control seekability of connection during encoding. If set to 1 the
- resource is supposed to be seekable, if set to 0 it is assumed not
- to be seekable. Default value is 0.
- </p></dd>
- </dl>
- <p>NOTE: Protocol can be used as output, but it is recommended to not do
- it, unless special care is taken (tests, customized server configuration
- etc.). Different FTP servers behave in different way during seek
- operation. ff* tools may produce incomplete content due to server limitations.
- </p>
- <a name="gopher"></a>
- <h3 class="section">24.12 gopher<span class="pull-right"><a class="anchor hidden-xs" href="#gopher" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gopher" aria-hidden="true">TOC</a></span></h3>
- <p>Gopher protocol.
- </p>
- <a name="gophers"></a>
- <h3 class="section">24.13 gophers<span class="pull-right"><a class="anchor hidden-xs" href="#gophers" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gophers" aria-hidden="true">TOC</a></span></h3>
- <p>Gophers protocol.
- </p>
- <p>The Gopher protocol with TLS encapsulation.
- </p>
- <a name="hls-3"></a>
- <h3 class="section">24.14 hls<span class="pull-right"><a class="anchor hidden-xs" href="#hls-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hls-3" aria-hidden="true">TOC</a></span></h3>
- <p>Read Apple HTTP Live Streaming compliant segmented stream as
- a uniform one. The M3U8 playlists describing the segments can be
- remote HTTP resources or local files, accessed using the standard
- file protocol.
- The nested protocol is declared by specifying
- "+<var class="var">proto</var>" after the hls URI scheme name, where <var class="var">proto</var>
- is either "file" or "http".
- </p>
- <div class="example">
- <pre class="example-preformatted">hls+http://host/path/to/remote/resource.m3u8
- hls+file://path/to/local/resource.m3u8
- </pre></div>
- <p>Using this protocol is discouraged - the hls demuxer should work
- just as well (if not, please report the issues) and is more complete.
- To use the hls demuxer instead, simply use the direct URLs to the
- m3u8 files.
- </p>
- <a name="http"></a>
- <h3 class="section">24.15 http<span class="pull-right"><a class="anchor hidden-xs" href="#http" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-http" aria-hidden="true">TOC</a></span></h3>
- <p>HTTP (Hyper Text Transfer Protocol).
- </p>
- <p>This protocol accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">seekable</samp></dt>
- <dd><p>Control seekability of connection. If set to 1 the resource is
- supposed to be seekable, if set to 0 it is assumed not to be seekable,
- if set to -1 it will try to autodetect if it is seekable. Default
- value is -1.
- </p>
- </dd>
- <dt><samp class="option">chunked_post</samp></dt>
- <dd><p>If set to 1 use chunked Transfer-Encoding for posts, default is 1.
- </p>
- </dd>
- <dt><samp class="option">http_proxy</samp></dt>
- <dd><p>set HTTP proxy to tunnel through e.g. http://example.com:1234
- </p>
- </dd>
- <dt><samp class="option">headers</samp></dt>
- <dd><p>Set custom HTTP headers, can override built in default headers. The
- value must be a string encoding the headers.
- </p>
- </dd>
- <dt><samp class="option">content_type</samp></dt>
- <dd><p>Set a specific content type for the POST messages or for listen mode.
- </p>
- </dd>
- <dt><samp class="option">user_agent</samp></dt>
- <dd><p>Override the User-Agent header. If not specified the protocol will use a
- string describing the libavformat build. ("Lavf/<version>")
- </p>
- </dd>
- <dt><samp class="option">referer</samp></dt>
- <dd><p>Set the Referer header. Include ’Referer: URL’ header in HTTP request.
- </p>
- </dd>
- <dt><samp class="option">multiple_requests</samp></dt>
- <dd><p>Use persistent connections if set to 1, default is 0.
- </p>
- </dd>
- <dt><samp class="option">post_data</samp></dt>
- <dd><p>Set custom HTTP post data.
- </p>
- </dd>
- <dt><samp class="option">mime_type</samp></dt>
- <dd><p>Export the MIME type.
- </p>
- </dd>
- <dt><samp class="option">http_version</samp></dt>
- <dd><p>Exports the HTTP response version number. Usually "1.0" or "1.1".
- </p>
- </dd>
- <dt><samp class="option">cookies</samp></dt>
- <dd><p>Set the cookies to be sent in future requests. The format of each cookie is the
- same as the value of a Set-Cookie HTTP response field. Multiple cookies can be
- delimited by a newline character.
- </p>
- </dd>
- <dt><samp class="option">icy</samp></dt>
- <dd><p>If set to 1 request ICY (SHOUTcast) metadata from the server. If the server
- supports this, the metadata has to be retrieved by the application by reading
- the <samp class="option">icy_metadata_headers</samp> and <samp class="option">icy_metadata_packet</samp> options.
- The default is 1.
- </p>
- </dd>
- <dt><samp class="option">icy_metadata_headers</samp></dt>
- <dd><p>If the server supports ICY metadata, this contains the ICY-specific HTTP reply
- headers, separated by newline characters.
- </p>
- </dd>
- <dt><samp class="option">icy_metadata_packet</samp></dt>
- <dd><p>If the server supports ICY metadata, and <samp class="option">icy</samp> was set to 1, this
- contains the last non-empty metadata packet sent by the server. It should be
- polled in regular intervals by applications interested in mid-stream metadata
- updates.
- </p>
- </dd>
- <dt><samp class="option">metadata</samp></dt>
- <dd><p>Set an exported dictionary containing Icecast metadata from the bitstream, if present.
- Only useful with the C API.
- </p>
- </dd>
- <dt><samp class="option">auth_type</samp></dt>
- <dd>
- <p>Set HTTP authentication type. No option for Digest, since this method requires
- getting nonce parameters from the server first and can’t be used straight away like
- Basic.
- </p>
- <dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>Choose the HTTP authentication type automatically. This is the default.
- </p></dd>
- <dt><samp class="option">basic</samp></dt>
- <dd>
- <p>Choose the HTTP basic authentication.
- </p>
- <p>Basic authentication sends a Base64-encoded string that contains a user name and password
- for the client. Base64 is not a form of encryption and should be considered the same as
- sending the user name and password in clear text (Base64 is a reversible encoding).
- If a resource needs to be protected, strongly consider using an authentication scheme
- other than basic authentication. HTTPS/TLS should be used with basic authentication.
- Without these additional security enhancements, basic authentication should not be used
- to protect sensitive or valuable information.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">send_expect_100</samp></dt>
- <dd><p>Send an Expect: 100-continue header for POST. If set to 1 it will send, if set
- to 0 it won’t, if set to -1 it will try to send if it is applicable. Default
- value is -1.
- </p>
- </dd>
- <dt><samp class="option">location</samp></dt>
- <dd><p>An exported dictionary containing the content location. Only useful with the C
- API.
- </p>
- </dd>
- <dt><samp class="option">offset</samp></dt>
- <dd><p>Set initial byte offset.
- </p>
- </dd>
- <dt><samp class="option">end_offset</samp></dt>
- <dd><p>Try to limit the request to bytes preceding this offset.
- </p>
- </dd>
- <dt><samp class="option">method</samp></dt>
- <dd><p>When used as a client option it sets the HTTP method for the request.
- </p>
- <p>When used as a server option it sets the HTTP method that is going to be
- expected from the client(s).
- If the expected and the received HTTP method do not match the client will
- be given a Bad Request response.
- When unset the HTTP method is not checked for now. This will be replaced by
- autodetection in the future.
- </p>
- </dd>
- <dt><samp class="option">reconnect</samp></dt>
- <dd><p>Reconnect automatically when disconnected before EOF is hit.
- </p>
- </dd>
- <dt><samp class="option">reconnect_at_eof</samp></dt>
- <dd><p>If set then eof is treated like an error and causes reconnection, this is useful
- for live / endless streams.
- </p>
- </dd>
- <dt><samp class="option">reconnect_on_network_error</samp></dt>
- <dd><p>Reconnect automatically in case of TCP/TLS errors during connect.
- </p>
- </dd>
- <dt><samp class="option">reconnect_on_http_error</samp></dt>
- <dd><p>A comma separated list of HTTP status codes to reconnect on. The list can
- include specific status codes (e.g. ’503’) or the strings ’4xx’ / ’5xx’.
- </p>
- </dd>
- <dt><samp class="option">reconnect_streamed</samp></dt>
- <dd><p>If set then even streamed/non seekable streams will be reconnected on errors.
- </p>
- </dd>
- <dt><samp class="option">reconnect_delay_max</samp></dt>
- <dd><p>Set the maximum delay in seconds after which to give up reconnecting.
- </p>
- </dd>
- <dt><samp class="option">reconnect_max_retries</samp></dt>
- <dd><p>Set the maximum number of times to retry a connection. Default unset.
- </p>
- </dd>
- <dt><samp class="option">reconnect_delay_total_max</samp></dt>
- <dd><p>Set the maximum total delay in seconds after which to give up reconnecting.
- </p>
- </dd>
- <dt><samp class="option">respect_retry_after</samp></dt>
- <dd><p>If enabled, and a Retry-After header is encountered, its requested reconnection
- delay will be honored, rather than using exponential backoff. Useful for 429 and
- 503 errors. Default enabled.
- </p>
- </dd>
- <dt><samp class="option">listen</samp></dt>
- <dd><p>If set to 1 enables experimental HTTP server. This can be used to send data when
- used as an output option, or read data from a client with HTTP POST when used as
- an input option.
- If set to 2 enables experimental multi-client HTTP server. This is not yet implemented
- in ffmpeg.c and thus must not be used as a command line option.
- </p><div class="example">
- <pre class="example-preformatted"># Server side (sending):
- ffmpeg -i somefile.ogg -c copy -listen 1 -f ogg http://<var class="var">server</var>:<var class="var">port</var>
- # Client side (receiving):
- ffmpeg -i http://<var class="var">server</var>:<var class="var">port</var> -c copy somefile.ogg
- # Client can also be done with wget:
- wget http://<var class="var">server</var>:<var class="var">port</var> -O somefile.ogg
- # Server side (receiving):
- ffmpeg -listen 1 -i http://<var class="var">server</var>:<var class="var">port</var> -c copy somefile.ogg
- # Client side (sending):
- ffmpeg -i somefile.ogg -chunked_post 0 -c copy -f ogg http://<var class="var">server</var>:<var class="var">port</var>
- # Client can also be done with wget:
- wget --post-file=somefile.ogg http://<var class="var">server</var>:<var class="var">port</var>
- </pre></div>
- </dd>
- <dt><samp class="option">resource</samp></dt>
- <dd><p>The resource requested by a client, when the experimental HTTP server is in use.
- </p>
- </dd>
- <dt><samp class="option">reply_code</samp></dt>
- <dd><p>The HTTP code returned to the client, when the experimental HTTP server is in use.
- </p>
- </dd>
- <dt><samp class="option">short_seek_size</samp></dt>
- <dd><p>Set the threshold, in bytes, for when a readahead should be preferred over a seek and
- new HTTP request. This is useful, for example, to make sure the same connection
- is used for reading large video packets with small audio packets in between.
- </p>
- </dd>
- </dl>
- <a name="HTTP-Cookies"></a>
- <h4 class="subsection">24.15.1 HTTP Cookies<span class="pull-right"><a class="anchor hidden-xs" href="#HTTP-Cookies" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-HTTP-Cookies" aria-hidden="true">TOC</a></span></h4>
- <p>Some HTTP requests will be denied unless cookie values are passed in with the
- request. The <samp class="option">cookies</samp> option allows these cookies to be specified. At
- the very least, each cookie must specify a value along with a path and domain.
- HTTP requests that match both the domain and path will automatically include the
- cookie value in the HTTP Cookie header field. Multiple cookies can be delimited
- by a newline.
- </p>
- <p>The required syntax to play a stream specifying a cookie is:
- </p><div class="example">
- <pre class="example-preformatted">ffplay -cookies "nlqptid=nltid=tsn; path=/; domain=somedomain.com;" http://somedomain.com/somestream.m3u8
- </pre></div>
- <a name="Icecast"></a>
- <h3 class="section">24.16 Icecast<span class="pull-right"><a class="anchor hidden-xs" href="#Icecast" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Icecast" aria-hidden="true">TOC</a></span></h3>
- <p>Icecast protocol (stream to Icecast servers)
- </p>
- <p>This protocol accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">ice_genre</samp></dt>
- <dd><p>Set the stream genre.
- </p>
- </dd>
- <dt><samp class="option">ice_name</samp></dt>
- <dd><p>Set the stream name.
- </p>
- </dd>
- <dt><samp class="option">ice_description</samp></dt>
- <dd><p>Set the stream description.
- </p>
- </dd>
- <dt><samp class="option">ice_url</samp></dt>
- <dd><p>Set the stream website URL.
- </p>
- </dd>
- <dt><samp class="option">ice_public</samp></dt>
- <dd><p>Set if the stream should be public.
- The default is 0 (not public).
- </p>
- </dd>
- <dt><samp class="option">user_agent</samp></dt>
- <dd><p>Override the User-Agent header. If not specified a string of the form
- "Lavf/<version>" will be used.
- </p>
- </dd>
- <dt><samp class="option">password</samp></dt>
- <dd><p>Set the Icecast mountpoint password.
- </p>
- </dd>
- <dt><samp class="option">content_type</samp></dt>
- <dd><p>Set the stream content type. This must be set if it is different from
- audio/mpeg.
- </p>
- </dd>
- <dt><samp class="option">legacy_icecast</samp></dt>
- <dd><p>This enables support for Icecast versions < 2.4.0, that do not support the
- HTTP PUT method but the SOURCE method.
- </p>
- </dd>
- <dt><samp class="option">tls</samp></dt>
- <dd><p>Establish a TLS (HTTPS) connection to Icecast.
- </p>
- </dd>
- </dl>
- <div class="example">
- <pre class="example-preformatted">icecast://[<var class="var">username</var>[:<var class="var">password</var>]@]<var class="var">server</var>:<var class="var">port</var>/<var class="var">mountpoint</var>
- </pre></div>
- <a name="ipfs"></a>
- <h3 class="section">24.17 ipfs<span class="pull-right"><a class="anchor hidden-xs" href="#ipfs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ipfs" aria-hidden="true">TOC</a></span></h3>
- <p>InterPlanetary File System (IPFS) protocol support. One can access files stored
- on the IPFS network through so-called gateways. These are http(s) endpoints.
- This protocol wraps the IPFS native protocols (ipfs:// and ipns://) to be sent
- to such a gateway. Users can (and should) host their own node which means this
- protocol will use one’s local gateway to access files on the IPFS network.
- </p>
- <p>This protocol accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">gateway</samp></dt>
- <dd><p>Defines the gateway to use. When not set, the protocol will first try
- locating the local gateway by looking at <code class="code">$IPFS_GATEWAY</code>, <code class="code">$IPFS_PATH</code>
- and <code class="code">$HOME/.ipfs/</code>, in that order.
- </p>
- </dd>
- </dl>
- <p>One can use this protocol in 2 ways. Using IPFS:
- </p><div class="example">
- <pre class="example-preformatted">ffplay ipfs://<hash>
- </pre></div>
- <p>Or the IPNS protocol (IPNS is mutable IPFS):
- </p><div class="example">
- <pre class="example-preformatted">ffplay ipns://<hash>
- </pre></div>
- <a name="mmst"></a>
- <h3 class="section">24.18 mmst<span class="pull-right"><a class="anchor hidden-xs" href="#mmst" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mmst" aria-hidden="true">TOC</a></span></h3>
- <p>MMS (Microsoft Media Server) protocol over TCP.
- </p>
- <a name="mmsh"></a>
- <h3 class="section">24.19 mmsh<span class="pull-right"><a class="anchor hidden-xs" href="#mmsh" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mmsh" aria-hidden="true">TOC</a></span></h3>
- <p>MMS (Microsoft Media Server) protocol over HTTP.
- </p>
- <p>The required syntax is:
- </p><div class="example">
- <pre class="example-preformatted">mmsh://<var class="var">server</var>[:<var class="var">port</var>][/<var class="var">app</var>][/<var class="var">playpath</var>]
- </pre></div>
- <a name="md5-2"></a>
- <h3 class="section">24.20 md5<span class="pull-right"><a class="anchor hidden-xs" href="#md5-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-md5-2" aria-hidden="true">TOC</a></span></h3>
- <p>MD5 output protocol.
- </p>
- <p>Computes the MD5 hash of the data to be written, and on close writes
- this to the designated output or stdout if none is specified. It can
- be used to test muxers without writing an actual file.
- </p>
- <p>Some examples follow.
- </p><div class="example">
- <pre class="example-preformatted"># Write the MD5 hash of the encoded AVI file to the file output.avi.md5.
- ffmpeg -i input.flv -f avi -y md5:output.avi.md5
- # Write the MD5 hash of the encoded AVI file to stdout.
- ffmpeg -i input.flv -f avi -y md5:
- </pre></div>
- <p>Note that some formats (typically MOV) require the output protocol to
- be seekable, so they will fail with the MD5 output protocol.
- </p>
- <a name="pipe"></a>
- <h3 class="section">24.21 pipe<span class="pull-right"><a class="anchor hidden-xs" href="#pipe" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pipe" aria-hidden="true">TOC</a></span></h3>
- <p>UNIX pipe access protocol.
- </p>
- <p>Read and write from UNIX pipes.
- </p>
- <p>The accepted syntax is:
- </p><div class="example">
- <pre class="example-preformatted">pipe:[<var class="var">number</var>]
- </pre></div>
- <p>If <samp class="option">fd</samp> isn’t specified, <var class="var">number</var> is the number corresponding to the file descriptor of the
- pipe (e.g. 0 for stdin, 1 for stdout, 2 for stderr). If <var class="var">number</var>
- is not specified, by default the stdout file descriptor will be used
- for writing, stdin for reading.
- </p>
- <p>For example to read from stdin with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">cat test.wav | ffmpeg -i pipe:0
- # ...this is the same as...
- cat test.wav | ffmpeg -i pipe:
- </pre></div>
- <p>For writing to stdout with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i test.wav -f avi pipe:1 | cat > test.avi
- # ...this is the same as...
- ffmpeg -i test.wav -f avi pipe: | cat > test.avi
- </pre></div>
- <p>This protocol accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">blocksize</samp></dt>
- <dd><p>Set I/O operation maximum block size, in bytes. Default value is
- <code class="code">INT_MAX</code>, which results in not limiting the requested block size.
- Setting this value reasonably low improves user termination request reaction
- time, which is valuable if data transmission is slow.
- </p></dd>
- <dt><samp class="option">fd</samp></dt>
- <dd><p>Set file descriptor.
- </p></dd>
- </dl>
- <p>Note that some formats (typically MOV), require the output protocol to
- be seekable, so they will fail with the pipe output protocol.
- </p>
- <a name="prompeg"></a>
- <h3 class="section">24.22 prompeg<span class="pull-right"><a class="anchor hidden-xs" href="#prompeg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-prompeg" aria-hidden="true">TOC</a></span></h3>
- <p>Pro-MPEG Code of Practice #3 Release 2 FEC protocol.
- </p>
- <p>The Pro-MPEG CoP#3 FEC is a 2D parity-check forward error correction mechanism
- for MPEG-2 Transport Streams sent over RTP.
- </p>
- <p>This protocol must be used in conjunction with the <code class="code">rtp_mpegts</code> muxer and
- the <code class="code">rtp</code> protocol.
- </p>
- <p>The required syntax is:
- </p><div class="example">
- <pre class="example-preformatted">-f rtp_mpegts -fec prompeg=<var class="var">option</var>=<var class="var">val</var>... rtp://<var class="var">hostname</var>:<var class="var">port</var>
- </pre></div>
- <p>The destination UDP ports are <code class="code">port + 2</code> for the column FEC stream
- and <code class="code">port + 4</code> for the row FEC stream.
- </p>
- <p>This protocol accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">l=<var class="var">n</var></samp></dt>
- <dd><p>The number of columns (4-20, LxD <= 100)
- </p>
- </dd>
- <dt><samp class="option">d=<var class="var">n</var></samp></dt>
- <dd><p>The number of rows (4-20, LxD <= 100)
- </p>
- </dd>
- </dl>
- <p>Example usage:
- </p>
- <div class="example">
- <pre class="example-preformatted">-f rtp_mpegts -fec prompeg=l=8:d=4 rtp://<var class="var">hostname</var>:<var class="var">port</var>
- </pre></div>
- <a name="rist"></a>
- <h3 class="section">24.23 rist<span class="pull-right"><a class="anchor hidden-xs" href="#rist" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rist" aria-hidden="true">TOC</a></span></h3>
- <p>Reliable Internet Streaming Transport protocol
- </p>
- <p>The accepted options are:
- </p><dl class="table">
- <dt><samp class="option">rist_profile</samp></dt>
- <dd><p>Supported values:
- </p><dl class="table">
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dt>‘<samp class="samp">main</samp>’</dt>
- <dd><p>This one is default.
- </p></dd>
- <dt>‘<samp class="samp">advanced</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">buffer_size</samp></dt>
- <dd><p>Set internal RIST buffer size in milliseconds for retransmission of data.
- Default value is 0 which means the librist default (1 sec). Maximum value is 30
- seconds.
- </p>
- </dd>
- <dt><samp class="option">fifo_size</samp></dt>
- <dd><p>Size of the librist receiver output fifo in number of packets. This must be a
- power of 2.
- Defaults to 8192 (vs the librist default of 1024).
- </p>
- </dd>
- <dt><samp class="option">overrun_nonfatal=<var class="var">1|0</var></samp></dt>
- <dd><p>Survive in case of librist fifo buffer overrun. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>Set maximum packet size for sending data. 1316 by default.
- </p>
- </dd>
- <dt><samp class="option">log_level</samp></dt>
- <dd><p>Set loglevel for RIST logging messages. You only need to set this if you
- explicitly want to enable debug level messages or packet loss simulation,
- otherwise the regular loglevel is respected.
- </p>
- </dd>
- <dt><samp class="option">secret</samp></dt>
- <dd><p>Set override of encryption secret, by default is unset.
- </p>
- </dd>
- <dt><samp class="option">encryption</samp></dt>
- <dd><p>Set encryption type, by default is disabled.
- Acceptable values are 128 and 256.
- </p></dd>
- </dl>
- <a name="rtmp"></a>
- <h3 class="section">24.24 rtmp<span class="pull-right"><a class="anchor hidden-xs" href="#rtmp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtmp" aria-hidden="true">TOC</a></span></h3>
- <p>Real-Time Messaging Protocol.
- </p>
- <p>The Real-Time Messaging Protocol (RTMP) is used for streaming multimedia
- content across a TCP/IP network.
- </p>
- <p>The required syntax is:
- </p><div class="example">
- <pre class="example-preformatted">rtmp://[<var class="var">username</var>:<var class="var">password</var>@]<var class="var">server</var>[:<var class="var">port</var>][/<var class="var">app</var>][/<var class="var">instance</var>][/<var class="var">playpath</var>]
- </pre></div>
- <p>The accepted parameters are:
- </p><dl class="table">
- <dt><samp class="option">username</samp></dt>
- <dd><p>An optional username (mostly for publishing).
- </p>
- </dd>
- <dt><samp class="option">password</samp></dt>
- <dd><p>An optional password (mostly for publishing).
- </p>
- </dd>
- <dt><samp class="option">server</samp></dt>
- <dd><p>The address of the RTMP server.
- </p>
- </dd>
- <dt><samp class="option">port</samp></dt>
- <dd><p>The number of the TCP port to use (by default is 1935).
- </p>
- </dd>
- <dt><samp class="option">app</samp></dt>
- <dd><p>It is the name of the application to access. It usually corresponds to
- the path where the application is installed on the RTMP server
- (e.g. <samp class="file">/ondemand/</samp>, <samp class="file">/flash/live/</samp>, etc.). You can override
- the value parsed from the URI through the <code class="code">rtmp_app</code> option, too.
- </p>
- </dd>
- <dt><samp class="option">playpath</samp></dt>
- <dd><p>It is the path or name of the resource to play with reference to the
- application specified in <var class="var">app</var>, may be prefixed by "mp4:". You
- can override the value parsed from the URI through the <code class="code">rtmp_playpath</code>
- option, too.
- </p>
- </dd>
- <dt><samp class="option">listen</samp></dt>
- <dd><p>Act as a server, listening for an incoming connection.
- </p>
- </dd>
- <dt><samp class="option">timeout</samp></dt>
- <dd><p>Maximum time to wait for the incoming connection. Implies listen.
- </p></dd>
- </dl>
- <p>Additionally, the following parameters can be set via command line options
- (or in code via <code class="code">AVOption</code>s):
- </p><dl class="table">
- <dt><samp class="option">rtmp_app</samp></dt>
- <dd><p>Name of application to connect on the RTMP server. This option
- overrides the parameter specified in the URI.
- </p>
- </dd>
- <dt><samp class="option">rtmp_buffer</samp></dt>
- <dd><p>Set the client buffer time in milliseconds. The default is 3000.
- </p>
- </dd>
- <dt><samp class="option">rtmp_conn</samp></dt>
- <dd><p>Extra arbitrary AMF connection parameters, parsed from a string,
- e.g. like <code class="code">B:1 S:authMe O:1 NN:code:1.23 NS:flag:ok O:0</code>.
- Each value is prefixed by a single character denoting the type,
- B for Boolean, N for number, S for string, O for object, or Z for null,
- followed by a colon. For Booleans the data must be either 0 or 1 for
- FALSE or TRUE, respectively. Likewise for Objects the data must be 0 or
- 1 to end or begin an object, respectively. Data items in subobjects may
- be named, by prefixing the type with ’N’ and specifying the name before
- the value (i.e. <code class="code">NB:myFlag:1</code>). This option may be used multiple
- times to construct arbitrary AMF sequences.
- </p>
- </dd>
- <dt><samp class="option">rtmp_enhanced_codecs</samp></dt>
- <dd><p>Specify the list of codecs the client advertises to support in an
- enhanced RTMP stream. This option should be set to a comma separated
- list of fourcc values, like <code class="code">hvc1,av01,vp09</code> for multiple codecs
- or <code class="code">hvc1</code> for only one codec. The specified list will be presented
- in the "fourCcLive" property of the Connect Command Message.
- </p>
- </dd>
- <dt><samp class="option">rtmp_flashver</samp></dt>
- <dd><p>Version of the Flash plugin used to run the SWF player. The default
- is LNX 9,0,124,2. (When publishing, the default is FMLE/3.0 (compatible;
- <libavformat version>).)
- </p>
- </dd>
- <dt><samp class="option">rtmp_flush_interval</samp></dt>
- <dd><p>Number of packets flushed in the same request (RTMPT only). The default
- is 10.
- </p>
- </dd>
- <dt><samp class="option">rtmp_live</samp></dt>
- <dd><p>Specify that the media is a live stream. No resuming or seeking in
- live streams is possible. The default value is <code class="code">any</code>, which means the
- subscriber first tries to play the live stream specified in the
- playpath. If a live stream of that name is not found, it plays the
- recorded stream. The other possible values are <code class="code">live</code> and
- <code class="code">recorded</code>.
- </p>
- </dd>
- <dt><samp class="option">rtmp_pageurl</samp></dt>
- <dd><p>URL of the web page in which the media was embedded. By default no
- value will be sent.
- </p>
- </dd>
- <dt><samp class="option">rtmp_playpath</samp></dt>
- <dd><p>Stream identifier to play or to publish. This option overrides the
- parameter specified in the URI.
- </p>
- </dd>
- <dt><samp class="option">rtmp_subscribe</samp></dt>
- <dd><p>Name of live stream to subscribe to. By default no value will be sent.
- It is only sent if the option is specified or if rtmp_live
- is set to live.
- </p>
- </dd>
- <dt><samp class="option">rtmp_swfhash</samp></dt>
- <dd><p>SHA256 hash of the decompressed SWF file (32 bytes).
- </p>
- </dd>
- <dt><samp class="option">rtmp_swfsize</samp></dt>
- <dd><p>Size of the decompressed SWF file, required for SWFVerification.
- </p>
- </dd>
- <dt><samp class="option">rtmp_swfurl</samp></dt>
- <dd><p>URL of the SWF player for the media. By default no value will be sent.
- </p>
- </dd>
- <dt><samp class="option">rtmp_swfverify</samp></dt>
- <dd><p>URL to player swf file, compute hash/size automatically.
- </p>
- </dd>
- <dt><samp class="option">rtmp_tcurl</samp></dt>
- <dd><p>URL of the target stream. Defaults to proto://host[:port]/app.
- </p>
- </dd>
- <dt><samp class="option">tcp_nodelay=<var class="var">1|0</var></samp></dt>
- <dd><p>Set TCP_NODELAY to disable Nagle’s algorithm. Default value is 0.
- </p>
- <p><em class="emph">Remark: Writing to the socket is currently not optimized to minimize system calls and reduces the efficiency / effect of TCP_NODELAY.</em>
- </p>
- </dd>
- <dt><samp class="option">tcp_keepalive=<var class="var">1|0</var></samp></dt>
- <dd><p>Enable the TCP keepalive mechanism to detect dead peers and help maintain long-lived idle connections. Default value is 0.
- </p>
- <p>Only the basic keepalive option (SO_KEEPALIVE) can be enabled or disabled. Platform-specific tuning parameters such as TCP_KEEPIDLE, TCP_KEEPINTVL, or TCP_KEEPCNT are not configurable and will use the operating system’s default values.
- </p>
- </dd>
- </dl>
- <p>For example to read with <code class="command">ffplay</code> a multimedia resource named
- "sample" from the application "vod" from an RTMP server "myserver":
- </p><div class="example">
- <pre class="example-preformatted">ffplay rtmp://myserver/vod/sample
- </pre></div>
- <p>To publish to a password protected server, passing the playpath and
- app names separately:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i <input> -f flv -rtmp_playpath some/long/path -rtmp_app long/app/name rtmp://username:password@myserver/
- </pre></div>
- <a name="rtmpe"></a>
- <h3 class="section">24.25 rtmpe<span class="pull-right"><a class="anchor hidden-xs" href="#rtmpe" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtmpe" aria-hidden="true">TOC</a></span></h3>
- <p>Encrypted Real-Time Messaging Protocol.
- </p>
- <p>The Encrypted Real-Time Messaging Protocol (RTMPE) is used for
- streaming multimedia content within standard cryptographic primitives,
- consisting of Diffie-Hellman key exchange and HMACSHA256, generating
- a pair of RC4 keys.
- </p>
- <a name="rtmps"></a>
- <h3 class="section">24.26 rtmps<span class="pull-right"><a class="anchor hidden-xs" href="#rtmps" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtmps" aria-hidden="true">TOC</a></span></h3>
- <p>Real-Time Messaging Protocol over a secure SSL connection.
- </p>
- <p>The Real-Time Messaging Protocol (RTMPS) is used for streaming
- multimedia content across an encrypted connection.
- </p>
- <a name="rtmpt"></a>
- <h3 class="section">24.27 rtmpt<span class="pull-right"><a class="anchor hidden-xs" href="#rtmpt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtmpt" aria-hidden="true">TOC</a></span></h3>
- <p>Real-Time Messaging Protocol tunneled through HTTP.
- </p>
- <p>The Real-Time Messaging Protocol tunneled through HTTP (RTMPT) is used
- for streaming multimedia content within HTTP requests to traverse
- firewalls.
- </p>
- <a name="rtmpte"></a>
- <h3 class="section">24.28 rtmpte<span class="pull-right"><a class="anchor hidden-xs" href="#rtmpte" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtmpte" aria-hidden="true">TOC</a></span></h3>
- <p>Encrypted Real-Time Messaging Protocol tunneled through HTTP.
- </p>
- <p>The Encrypted Real-Time Messaging Protocol tunneled through HTTP (RTMPTE)
- is used for streaming multimedia content within HTTP requests to traverse
- firewalls.
- </p>
- <a name="rtmpts"></a>
- <h3 class="section">24.29 rtmpts<span class="pull-right"><a class="anchor hidden-xs" href="#rtmpts" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtmpts" aria-hidden="true">TOC</a></span></h3>
- <p>Real-Time Messaging Protocol tunneled through HTTPS.
- </p>
- <p>The Real-Time Messaging Protocol tunneled through HTTPS (RTMPTS) is used
- for streaming multimedia content within HTTPS requests to traverse
- firewalls.
- </p>
- <a name="libsmbclient"></a>
- <h3 class="section">24.30 libsmbclient<span class="pull-right"><a class="anchor hidden-xs" href="#libsmbclient" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libsmbclient" aria-hidden="true">TOC</a></span></h3>
- <p>libsmbclient permits one to manipulate CIFS/SMB network resources.
- </p>
- <p>Following syntax is required.
- </p>
- <div class="example">
- <pre class="example-preformatted">smb://[[domain:]user[:password@]]server[/share[/path[/file]]]
- </pre></div>
- <p>This protocol accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">timeout</samp></dt>
- <dd><p>Set timeout in milliseconds of socket I/O operations used by the underlying
- low level operation. By default it is set to -1, which means that the timeout
- is not specified.
- </p>
- </dd>
- <dt><samp class="option">truncate</samp></dt>
- <dd><p>Truncate existing files on write, if set to 1. A value of 0 prevents
- truncating. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">workgroup</samp></dt>
- <dd><p>Set the workgroup used for making connections. By default workgroup is not specified.
- </p>
- </dd>
- </dl>
- <p>For more information see: <a class="url" href="http://www.samba.org/">http://www.samba.org/</a>.
- </p>
- <a name="libssh"></a>
- <h3 class="section">24.31 libssh<span class="pull-right"><a class="anchor hidden-xs" href="#libssh" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libssh" aria-hidden="true">TOC</a></span></h3>
- <p>Secure File Transfer Protocol via libssh
- </p>
- <p>Read from or write to remote resources using SFTP protocol.
- </p>
- <p>Following syntax is required.
- </p>
- <div class="example">
- <pre class="example-preformatted">sftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg
- </pre></div>
- <p>This protocol accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">timeout</samp></dt>
- <dd><p>Set timeout of socket I/O operations used by the underlying low level
- operation. By default it is set to -1, which means that the timeout
- is not specified.
- </p>
- </dd>
- <dt><samp class="option">truncate</samp></dt>
- <dd><p>Truncate existing files on write, if set to 1. A value of 0 prevents
- truncating. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">private_key</samp></dt>
- <dd><p>Specify the path of the file containing private key to use during authorization.
- By default libssh searches for keys in the <samp class="file">~/.ssh/</samp> directory.
- </p>
- </dd>
- </dl>
- <p>Example: Play a file stored on remote server.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffplay sftp://user:password@server_address:22/home/user/resource.mpeg
- </pre></div>
- <a name="librtmp-rtmp_002c-rtmpe_002c-rtmps_002c-rtmpt_002c-rtmpte"></a>
- <h3 class="section">24.32 librtmp rtmp, rtmpe, rtmps, rtmpt, rtmpte<span class="pull-right"><a class="anchor hidden-xs" href="#librtmp-rtmp_002c-rtmpe_002c-rtmps_002c-rtmpt_002c-rtmpte" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-librtmp-rtmp_002c-rtmpe_002c-rtmps_002c-rtmpt_002c-rtmpte" aria-hidden="true">TOC</a></span></h3>
- <p>Real-Time Messaging Protocol and its variants supported through
- librtmp.
- </p>
- <p>Requires the presence of the librtmp headers and library during
- configuration. You need to explicitly configure the build with
- "–enable-librtmp". If enabled this will replace the native RTMP
- protocol.
- </p>
- <p>This protocol provides most client functions and a few server
- functions needed to support RTMP, RTMP tunneled in HTTP (RTMPT),
- encrypted RTMP (RTMPE), RTMP over SSL/TLS (RTMPS) and tunneled
- variants of these encrypted types (RTMPTE, RTMPTS).
- </p>
- <p>The required syntax is:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">rtmp_proto</var>://<var class="var">server</var>[:<var class="var">port</var>][/<var class="var">app</var>][/<var class="var">playpath</var>] <var class="var">options</var>
- </pre></div>
- <p>where <var class="var">rtmp_proto</var> is one of the strings "rtmp", "rtmpt", "rtmpe",
- "rtmps", "rtmpte", "rtmpts" corresponding to each RTMP variant, and
- <var class="var">server</var>, <var class="var">port</var>, <var class="var">app</var> and <var class="var">playpath</var> have the same
- meaning as specified for the RTMP native protocol.
- <var class="var">options</var> contains a list of space-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>.
- </p>
- <p>See the librtmp manual page (man 3 librtmp) for more information.
- </p>
- <p>For example, to stream a file in real-time to an RTMP server using
- <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i myfile -f flv rtmp://myserver/live/mystream
- </pre></div>
- <p>To play the same stream using <code class="command">ffplay</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffplay "rtmp://myserver/live/mystream live=1"
- </pre></div>
- <a name="rtp"></a>
- <h3 class="section">24.33 rtp<span class="pull-right"><a class="anchor hidden-xs" href="#rtp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtp" aria-hidden="true">TOC</a></span></h3>
- <p>Real-time Transport Protocol.
- </p>
- <p>The required syntax for an RTP URL is:
- </p><div class="example">
- <pre class="example-preformatted">rtp://<var class="var">hostname</var>[:<var class="var">port</var>][?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">port</var> specifies the RTP port to use.
- </p>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">ttl=<var class="var">n</var></samp></dt>
- <dd><p>Set the TTL (Time-To-Live) value (for multicast only).
- </p>
- </dd>
- <dt><samp class="option">rtcpport=<var class="var">n</var></samp></dt>
- <dd><p>Set the remote RTCP port to <var class="var">n</var>.
- </p>
- </dd>
- <dt><samp class="option">localport, local_rtpport, localrtpport=<var class="var">n</var></samp></dt>
- <dd><p>Set the local RTP port to <var class="var">n</var>.
- </p>
- <p>Using the localport option name is deprecated and should not be used.
- </p>
- </dd>
- <dt><samp class="option">local_rtcpport, localrtcpport=<var class="var">n</var>'</samp></dt>
- <dd><p>Set the local RTCP port to <var class="var">n</var>.
- </p>
- </dd>
- <dt><samp class="option">pkt_size=<var class="var">n</var></samp></dt>
- <dd><p>Set max packet size (in bytes) to <var class="var">n</var>.
- </p>
- </dd>
- <dt><samp class="option">buffer_size=<var class="var">size</var></samp></dt>
- <dd><p>Set the maximum UDP socket buffer size in bytes.
- </p>
- </dd>
- <dt><samp class="option">connect=0|1</samp></dt>
- <dd><p>Do a <code class="code">connect()</code> on the UDP socket (if set to 1) or not (if set
- to 0).
- </p>
- </dd>
- <dt><samp class="option">sources=<var class="var">ip</var>[,<var class="var">ip</var>]</samp></dt>
- <dd><p>List allowed source IP addresses.
- </p>
- </dd>
- <dt><samp class="option">block=<var class="var">ip</var>[,<var class="var">ip</var>]</samp></dt>
- <dd><p>List disallowed (blocked) source IP addresses.
- </p>
- </dd>
- <dt><samp class="option">write_to_source=0|1</samp></dt>
- <dd><p>Send packets to the source address of the latest received packet (if
- set to 1) or to a default remote address (if set to 0).
- </p>
- </dd>
- <dt><samp class="option">localaddr=<var class="var">addr</var></samp></dt>
- <dd><p>Local IP address of a network interface used for sending packets or joining
- multicast groups.
- </p>
- </dd>
- <dt><samp class="option">timeout=<var class="var">n</var></samp></dt>
- <dd><p>Set timeout (in microseconds) of socket I/O operations to <var class="var">n</var>.
- </p></dd>
- </dl>
- <p>Important notes:
- </p>
- <ol class="enumerate">
- <li> If <samp class="option">rtcpport</samp> is not set the RTCP port will be set to the RTP
- port value plus 1.
- </li><li> If <samp class="option">localrtpport</samp> (the local RTP port) is not set any available
- port will be used for the local RTP and RTCP ports.
- </li><li> If <samp class="option">localrtcpport</samp> (the local RTCP port) is not set it will be
- set to the local RTP port value plus 1.
- </li></ol>
- <a name="rtsp"></a>
- <h3 class="section">24.34 rtsp<span class="pull-right"><a class="anchor hidden-xs" href="#rtsp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rtsp" aria-hidden="true">TOC</a></span></h3>
- <p>Real-Time Streaming Protocol.
- </p>
- <p>RTSP is not technically a protocol handler in libavformat, it is a demuxer
- and muxer. The demuxer supports both normal RTSP (with data transferred
- over RTP; this is used by e.g. Apple and Microsoft) and Real-RTSP (with
- data transferred over RDT).
- </p>
- <p>The muxer can be used to send a stream using RTSP ANNOUNCE to a server
- supporting it (currently Darwin Streaming Server and Mischa Spiegelmock’s
- <a class="uref" href="https://github.com/revmischa/rtsp-server">RTSP server</a>).
- </p>
- <p>The required syntax for a RTSP url is:
- </p><div class="example">
- <pre class="example-preformatted">rtsp://<var class="var">hostname</var>[:<var class="var">port</var>]/<var class="var">path</var>
- </pre></div>
- <p>Options can be set on the <code class="command">ffmpeg</code>/<code class="command">ffplay</code> command
- line, or set in code via <code class="code">AVOption</code>s or in
- <code class="code">avformat_open_input</code>.
- </p>
- <a name="Muxer"></a>
- <h4 class="subsection">24.34.1 Muxer<span class="pull-right"><a class="anchor hidden-xs" href="#Muxer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Muxer" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported.
- </p>
- <dl class="table">
- <dt><samp class="option">rtsp_transport</samp></dt>
- <dd><p>Set RTSP transport protocols.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">udp</samp>’</dt>
- <dd><p>Use UDP as lower transport protocol.
- </p>
- </dd>
- <dt>‘<samp class="samp">tcp</samp>’</dt>
- <dd><p>Use TCP (interleaving within the RTSP control channel) as lower
- transport protocol.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">0</samp>’.
- </p>
- </dd>
- <dt><samp class="option">rtsp_flags</samp></dt>
- <dd><p>Set RTSP flags.
- </p>
- <p>The following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">latm</samp>’</dt>
- <dd><p>Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC.
- </p></dd>
- <dt>‘<samp class="samp">rfc2190</samp>’</dt>
- <dd><p>Use RFC 2190 packetization instead of RFC 4629 for H.263.
- </p></dd>
- <dt>‘<samp class="samp">skip_rtcp</samp>’</dt>
- <dd><p>Don’t send RTCP sender reports.
- </p></dd>
- <dt>‘<samp class="samp">h264_mode0</samp>’</dt>
- <dd><p>Use mode 0 for H.264 in RTP.
- </p></dd>
- <dt>‘<samp class="samp">send_bye</samp>’</dt>
- <dd><p>Send RTCP BYE packets when finishing.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">0</samp>’.
- </p>
- </dd>
- <dt><samp class="option">min_port</samp></dt>
- <dd><p>Set minimum local UDP port. Default value is 5000.
- </p>
- </dd>
- <dt><samp class="option">max_port</samp></dt>
- <dd><p>Set maximum local UDP port. Default value is 65000.
- </p>
- </dd>
- <dt><samp class="option">buffer_size</samp></dt>
- <dd><p>Set the maximum socket buffer size in bytes.
- </p>
- </dd>
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>Set max send packet size (in bytes). Default value is 1472.
- </p></dd>
- </dl>
- <a name="Demuxer"></a>
- <h4 class="subsection">24.34.2 Demuxer<span class="pull-right"><a class="anchor hidden-xs" href="#Demuxer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Demuxer" aria-hidden="true">TOC</a></span></h4>
- <p>The following options are supported.
- </p>
- <dl class="table">
- <dt><samp class="option">initial_pause</samp></dt>
- <dd><p>Do not start playing the stream immediately if set to 1. Default value
- is 0.
- </p>
- </dd>
- <dt><samp class="option">rtsp_transport</samp></dt>
- <dd><p>Set RTSP transport protocols.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">udp</samp>’</dt>
- <dd><p>Use UDP as lower transport protocol.
- </p>
- </dd>
- <dt>‘<samp class="samp">tcp</samp>’</dt>
- <dd><p>Use TCP (interleaving within the RTSP control channel) as lower
- transport protocol.
- </p>
- </dd>
- <dt>‘<samp class="samp">udp_multicast</samp>’</dt>
- <dd><p>Use UDP multicast as lower transport protocol.
- </p>
- </dd>
- <dt>‘<samp class="samp">http</samp>’</dt>
- <dd><p>Use HTTP tunneling as lower transport protocol, which is useful for
- passing proxies.
- </p>
- </dd>
- <dt>‘<samp class="samp">https</samp>’</dt>
- <dd><p>Use HTTPs tunneling as lower transport protocol, which is useful for
- passing proxies and widely used for security consideration.
- </p></dd>
- </dl>
- <p>Multiple lower transport protocols may be specified, in that case they are
- tried one at a time (if the setup of one fails, the next one is tried).
- For the muxer, only the ‘<samp class="samp">tcp</samp>’ and ‘<samp class="samp">udp</samp>’ options are supported.
- </p>
- </dd>
- <dt><samp class="option">rtsp_flags</samp></dt>
- <dd><p>Set RTSP flags.
- </p>
- <p>The following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">filter_src</samp>’</dt>
- <dd><p>Accept packets only from negotiated peer address and port.
- </p></dd>
- <dt>‘<samp class="samp">listen</samp>’</dt>
- <dd><p>Act as a server, listening for an incoming connection.
- </p></dd>
- <dt>‘<samp class="samp">prefer_tcp</samp>’</dt>
- <dd><p>Try TCP for RTP transport first, if TCP is available as RTSP RTP transport.
- </p></dd>
- <dt>‘<samp class="samp">satip_raw</samp>’</dt>
- <dd><p>Export raw MPEG-TS stream instead of demuxing. The flag will simply write out
- the raw stream, with the original PAT/PMT/PIDs intact.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">none</samp>’.
- </p>
- </dd>
- <dt><samp class="option">allowed_media_types</samp></dt>
- <dd><p>Set media types to accept from the server.
- </p>
- <p>The following flags are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">video</samp>’</dt>
- <dt>‘<samp class="samp">audio</samp>’</dt>
- <dt>‘<samp class="samp">data</samp>’</dt>
- <dt>‘<samp class="samp">subtitle</samp>’</dt>
- </dl>
- <p>By default it accepts all media types.
- </p>
- </dd>
- <dt><samp class="option">min_port</samp></dt>
- <dd><p>Set minimum local UDP port. Default value is 5000.
- </p>
- </dd>
- <dt><samp class="option">max_port</samp></dt>
- <dd><p>Set maximum local UDP port. Default value is 65000.
- </p>
- </dd>
- <dt><samp class="option">listen_timeout</samp></dt>
- <dd><p>Set maximum timeout (in seconds) to establish an initial connection. Setting
- <samp class="option">listen_timeout</samp> > 0 sets <samp class="option">rtsp_flags</samp> to ‘<samp class="samp">listen</samp>’. Default is -1
- which means an infinite timeout when ‘<samp class="samp">listen</samp>’ mode is set.
- </p>
- </dd>
- <dt><samp class="option">reorder_queue_size</samp></dt>
- <dd><p>Set number of packets to buffer for handling of reordered packets.
- </p>
- </dd>
- <dt><samp class="option">timeout</samp></dt>
- <dd><p>Set socket TCP I/O timeout in microseconds.
- </p>
- </dd>
- <dt><samp class="option">user_agent</samp></dt>
- <dd><p>Override User-Agent header. If not specified, it defaults to the
- libavformat identifier string.
- </p>
- </dd>
- <dt><samp class="option">buffer_size</samp></dt>
- <dd><p>Set the maximum socket buffer size in bytes.
- </p></dd>
- </dl>
- <p>When receiving data over UDP, the demuxer tries to reorder received packets
- (since they may arrive out of order, or packets may get lost totally). This
- can be disabled by setting the maximum demuxing delay to zero (via
- the <code class="code">max_delay</code> field of AVFormatContext).
- </p>
- <p>When watching multi-bitrate Real-RTSP streams with <code class="command">ffplay</code>, the
- streams to display can be chosen with <code class="code">-vst</code> <var class="var">n</var> and
- <code class="code">-ast</code> <var class="var">n</var> for video and audio respectively, and can be switched
- on the fly by pressing <code class="code">v</code> and <code class="code">a</code>.
- </p>
- <a name="Examples-28"></a>
- <h4 class="subsection">24.34.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-28" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-28" aria-hidden="true">TOC</a></span></h4>
- <p>The following examples all make use of the <code class="command">ffplay</code> and
- <code class="command">ffmpeg</code> tools.
- </p>
- <ul class="itemize mark-bullet">
- <li>Watch a stream over UDP, with a max reordering delay of 0.5 seconds:
- <div class="example">
- <pre class="example-preformatted">ffplay -max_delay 500000 -rtsp_transport udp rtsp://server/video.mp4
- </pre></div>
- </li><li>Watch a stream tunneled over HTTP:
- <div class="example">
- <pre class="example-preformatted">ffplay -rtsp_transport http rtsp://server/video.mp4
- </pre></div>
- </li><li>Send a stream in realtime to a RTSP server, for others to watch:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i <var class="var">input</var> -f rtsp -muxdelay 0.1 rtsp://server/live.sdp
- </pre></div>
- </li><li>Receive a stream in realtime:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -rtsp_flags listen -i rtsp://ownaddress/live.sdp <var class="var">output</var>
- </pre></div>
- </li></ul>
- <a name="sap"></a>
- <h3 class="section">24.35 sap<span class="pull-right"><a class="anchor hidden-xs" href="#sap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sap" aria-hidden="true">TOC</a></span></h3>
- <p>Session Announcement Protocol (RFC 2974). This is not technically a
- protocol handler in libavformat, it is a muxer and demuxer.
- It is used for signalling of RTP streams, by announcing the SDP for the
- streams regularly on a separate port.
- </p>
- <a name="Muxer-1"></a>
- <h4 class="subsection">24.35.1 Muxer<span class="pull-right"><a class="anchor hidden-xs" href="#Muxer-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Muxer-1" aria-hidden="true">TOC</a></span></h4>
- <p>The syntax for a SAP url given to the muxer is:
- </p><div class="example">
- <pre class="example-preformatted">sap://<var class="var">destination</var>[:<var class="var">port</var>][?<var class="var">options</var>]
- </pre></div>
- <p>The RTP packets are sent to <var class="var">destination</var> on port <var class="var">port</var>,
- or to port 5004 if no port is specified.
- <var class="var">options</var> is a <code class="code">&</code>-separated list. The following options
- are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">announce_addr=<var class="var">address</var></samp></dt>
- <dd><p>Specify the destination IP address for sending the announcements to.
- If omitted, the announcements are sent to the commonly used SAP
- announcement multicast address 224.2.127.254 (sap.mcast.net), or
- ff0e::2:7ffe if <var class="var">destination</var> is an IPv6 address.
- </p>
- </dd>
- <dt><samp class="option">announce_port=<var class="var">port</var></samp></dt>
- <dd><p>Specify the port to send the announcements on, defaults to
- 9875 if not specified.
- </p>
- </dd>
- <dt><samp class="option">ttl=<var class="var">ttl</var></samp></dt>
- <dd><p>Specify the time to live value for the announcements and RTP packets,
- defaults to 255.
- </p>
- </dd>
- <dt><samp class="option">same_port=<var class="var">0|1</var></samp></dt>
- <dd><p>If set to 1, send all RTP streams on the same port pair. If zero (the
- default), all streams are sent on unique ports, with each stream on a
- port 2 numbers higher than the previous.
- VLC/Live555 requires this to be set to 1, to be able to receive the stream.
- The RTP stack in libavformat for receiving requires all streams to be sent
- on unique ports.
- </p></dd>
- </dl>
- <p>Example command lines follow.
- </p>
- <p>To broadcast a stream on the local subnet, for watching in VLC:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i <var class="var">input</var> -f sap sap://224.0.0.255?same_port=1
- </pre></div>
- <p>Similarly, for watching in <code class="command">ffplay</code>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i <var class="var">input</var> -f sap sap://224.0.0.255
- </pre></div>
- <p>And for watching in <code class="command">ffplay</code>, over IPv6:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -re -i <var class="var">input</var> -f sap sap://[ff0e::1:2:3:4]
- </pre></div>
- <a name="Demuxer-1"></a>
- <h4 class="subsection">24.35.2 Demuxer<span class="pull-right"><a class="anchor hidden-xs" href="#Demuxer-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Demuxer-1" aria-hidden="true">TOC</a></span></h4>
- <p>The syntax for a SAP url given to the demuxer is:
- </p><div class="example">
- <pre class="example-preformatted">sap://[<var class="var">address</var>][:<var class="var">port</var>]
- </pre></div>
- <p><var class="var">address</var> is the multicast address to listen for announcements on,
- if omitted, the default 224.2.127.254 (sap.mcast.net) is used. <var class="var">port</var>
- is the port that is listened on, 9875 if omitted.
- </p>
- <p>The demuxers listens for announcements on the given address and port.
- Once an announcement is received, it tries to receive that particular stream.
- </p>
- <p>Example command lines follow.
- </p>
- <p>To play back the first stream announced on the normal SAP multicast address:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffplay sap://
- </pre></div>
- <p>To play back the first stream announced on one the default IPv6 SAP multicast address:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffplay sap://[ff0e::2:7ffe]
- </pre></div>
- <a name="sctp"></a>
- <h3 class="section">24.36 sctp<span class="pull-right"><a class="anchor hidden-xs" href="#sctp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sctp" aria-hidden="true">TOC</a></span></h3>
- <p>Stream Control Transmission Protocol.
- </p>
- <p>The accepted URL syntax is:
- </p><div class="example">
- <pre class="example-preformatted">sctp://<var class="var">host</var>:<var class="var">port</var>[?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">listen</samp></dt>
- <dd><p>If set to any value, listen for an incoming connection. Outgoing connection is done by default.
- </p>
- </dd>
- <dt><samp class="option">max_streams</samp></dt>
- <dd><p>Set the maximum number of streams. By default no limit is set.
- </p></dd>
- </dl>
- <a name="srt"></a>
- <h3 class="section">24.37 srt<span class="pull-right"><a class="anchor hidden-xs" href="#srt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-srt" aria-hidden="true">TOC</a></span></h3>
- <p>Haivision Secure Reliable Transport Protocol via libsrt.
- </p>
- <p>The supported syntax for a SRT URL is:
- </p><div class="example">
- <pre class="example-preformatted">srt://<var class="var">hostname</var>:<var class="var">port</var>[?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">connect_timeout=<var class="var">milliseconds</var></samp></dt>
- <dd><p>Connection timeout; SRT cannot connect for RTT > 1500 msec
- (2 handshake exchanges) with the default connect timeout of
- 3 seconds. This option applies to the caller and rendezvous
- connection modes. The connect timeout is 10 times the value
- set for the rendezvous mode (which can be used as a
- workaround for this connection problem with earlier versions).
- </p>
- </dd>
- <dt><samp class="option">ffs=<var class="var">bytes</var></samp></dt>
- <dd><p>Flight Flag Size (Window Size), in bytes. FFS is actually an
- internal parameter and you should set it to not less than
- <samp class="option">recv_buffer_size</samp> and <samp class="option">mss</samp>. The default value
- is relatively large, therefore unless you set a very large receiver buffer,
- you do not need to change this option. Default value is 25600.
- </p>
- </dd>
- <dt><samp class="option">inputbw=<var class="var">bytes/seconds</var></samp></dt>
- <dd><p>Sender nominal input rate, in bytes per seconds. Used along with
- <samp class="option">oheadbw</samp>, when <samp class="option">maxbw</samp> is set to relative (0), to
- calculate maximum sending rate when recovery packets are sent
- along with the main media stream:
- <samp class="option">inputbw</samp> * (100 + <samp class="option">oheadbw</samp>) / 100
- if <samp class="option">inputbw</samp> is not set while <samp class="option">maxbw</samp> is set to
- relative (0), the actual input rate is evaluated inside
- the library. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">iptos=<var class="var">tos</var></samp></dt>
- <dd><p>IP Type of Service. Applies to sender only. Default value is 0xB8.
- </p>
- </dd>
- <dt><samp class="option">ipttl=<var class="var">ttl</var></samp></dt>
- <dd><p>IP Time To Live. Applies to sender only. Default value is 64.
- </p>
- </dd>
- <dt><samp class="option">latency=<var class="var">microseconds</var></samp></dt>
- <dd><p>Timestamp-based Packet Delivery Delay.
- Used to absorb bursts of missed packet retransmissions.
- This flag sets both <samp class="option">rcvlatency</samp> and <samp class="option">peerlatency</samp>
- to the same value. Note that prior to version 1.3.0
- this is the only flag to set the latency, however
- this is effectively equivalent to setting <samp class="option">peerlatency</samp>,
- when side is sender and <samp class="option">rcvlatency</samp>
- when side is receiver, and the bidirectional stream
- sending is not supported.
- </p>
- </dd>
- <dt><samp class="option">listen_timeout=<var class="var">microseconds</var></samp></dt>
- <dd><p>Set socket listen timeout.
- </p>
- </dd>
- <dt><samp class="option">maxbw=<var class="var">bytes/seconds</var></samp></dt>
- <dd><p>Maximum sending bandwidth, in bytes per seconds.
- -1 infinite (CSRTCC limit is 30mbps)
- 0 relative to input rate (see <samp class="option">inputbw</samp>)
- >0 absolute limit value
- Default value is 0 (relative)
- </p>
- </dd>
- <dt><samp class="option">mode=<var class="var">caller|listener|rendezvous</var></samp></dt>
- <dd><p>Connection mode.
- <samp class="option">caller</samp> opens client connection.
- <samp class="option">listener</samp> starts server to listen for incoming connections.
- <samp class="option">rendezvous</samp> use Rendez-Vous connection mode.
- Default value is caller.
- </p>
- </dd>
- <dt><samp class="option">mss=<var class="var">bytes</var></samp></dt>
- <dd><p>Maximum Segment Size, in bytes. Used for buffer allocation
- and rate calculation using a packet counter assuming fully
- filled packets. The smallest MSS between the peers is
- used. This is 1500 by default in the overall internet.
- This is the maximum size of the UDP packet and can be
- only decreased, unless you have some unusual dedicated
- network settings. Default value is 1500.
- </p>
- </dd>
- <dt><samp class="option">nakreport=<var class="var">1|0</var></samp></dt>
- <dd><p>If set to 1, Receiver will send ‘UMSG_LOSSREPORT‘ messages
- periodically until a lost packet is retransmitted or
- intentionally dropped. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">oheadbw=<var class="var">percents</var></samp></dt>
- <dd><p>Recovery bandwidth overhead above input rate, in percents.
- See <samp class="option">inputbw</samp>. Default value is 25%.
- </p>
- </dd>
- <dt><samp class="option">passphrase=<var class="var">string</var></samp></dt>
- <dd><p>HaiCrypt Encryption/Decryption Passphrase string, length
- from 10 to 79 characters. The passphrase is the shared
- secret between the sender and the receiver. It is used
- to generate the Key Encrypting Key using PBKDF2
- (Password-Based Key Derivation Function). It is used
- only if <samp class="option">pbkeylen</samp> is non-zero. It is used on
- the receiver only if the received data is encrypted.
- The configured passphrase cannot be recovered (write-only).
- </p>
- </dd>
- <dt><samp class="option">enforced_encryption=<var class="var">1|0</var></samp></dt>
- <dd><p>If true, both connection parties must have the same password
- set (including empty, that is, with no encryption). If the
- password doesn’t match or only one side is unencrypted,
- the connection is rejected. Default is true.
- </p>
- </dd>
- <dt><samp class="option">kmrefreshrate=<var class="var">packets</var></samp></dt>
- <dd><p>The number of packets to be transmitted after which the
- encryption key is switched to a new key. Default is -1.
- -1 means auto (0x1000000 in srt library). The range for
- this option is integers in the 0 - <code class="code">INT_MAX</code>.
- </p>
- </dd>
- <dt><samp class="option">kmpreannounce=<var class="var">packets</var></samp></dt>
- <dd><p>The interval between when a new encryption key is sent and
- when switchover occurs. This value also applies to the
- subsequent interval between when switchover occurs and
- when the old encryption key is decommissioned. Default is -1.
- -1 means auto (0x1000 in srt library). The range for
- this option is integers in the 0 - <code class="code">INT_MAX</code>.
- </p>
- </dd>
- <dt><samp class="option">snddropdelay=<var class="var">microseconds</var></samp></dt>
- <dd><p>The sender’s extra delay before dropping packets. This delay is
- added to the default drop delay time interval value.
- </p>
- <p>Special value -1: Do not drop packets on the sender at all.
- </p>
- </dd>
- <dt><samp class="option">payload_size=<var class="var">bytes</var></samp></dt>
- <dd><p>Sets the maximum declared size of a packet transferred
- during the single call to the sending function in Live
- mode. Use 0 if this value isn’t used (which is default in
- file mode).
- Default is -1 (automatic), which typically means MPEG-TS;
- if you are going to use SRT
- to send any different kind of payload, such as, for example,
- wrapping a live stream in very small frames, then you can
- use a bigger maximum frame size, though not greater than
- 1456 bytes.
- </p>
- </dd>
- <dt><samp class="option">pkt_size=<var class="var">bytes</var></samp></dt>
- <dd><p>Alias for ‘<samp class="samp">payload_size</samp>’.
- </p>
- </dd>
- <dt><samp class="option">peerlatency=<var class="var">microseconds</var></samp></dt>
- <dd><p>The latency value (as described in <samp class="option">rcvlatency</samp>) that is
- set by the sender side as a minimum value for the receiver.
- </p>
- </dd>
- <dt><samp class="option">pbkeylen=<var class="var">bytes</var></samp></dt>
- <dd><p>Sender encryption key length, in bytes.
- Only can be set to 0, 16, 24 and 32.
- Enable sender encryption if not 0.
- Not required on receiver (set to 0),
- key size obtained from sender in HaiCrypt handshake.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">rcvlatency=<var class="var">microseconds</var></samp></dt>
- <dd><p>The time that should elapse since the moment when the
- packet was sent and the moment when it’s delivered to
- the receiver application in the receiving function.
- This time should be a buffer time large enough to cover
- the time spent for sending, unexpectedly extended RTT
- time, and the time needed to retransmit the lost UDP
- packet. The effective latency value will be the maximum
- of this options’ value and the value of <samp class="option">peerlatency</samp>
- set by the peer side. Before version 1.3.0 this option
- is only available as <samp class="option">latency</samp>.
- </p>
- </dd>
- <dt><samp class="option">recv_buffer_size=<var class="var">bytes</var></samp></dt>
- <dd><p>Set UDP receive buffer size, expressed in bytes.
- </p>
- </dd>
- <dt><samp class="option">send_buffer_size=<var class="var">bytes</var></samp></dt>
- <dd><p>Set UDP send buffer size, expressed in bytes.
- </p>
- </dd>
- <dt><samp class="option">timeout=<var class="var">microseconds</var></samp></dt>
- <dd><p>Set raise error timeouts for read, write and connect operations. Note that the
- SRT library has internal timeouts which can be controlled separately, the
- value set here is only a cap on those.
- </p>
- </dd>
- <dt><samp class="option">tlpktdrop=<var class="var">1|0</var></samp></dt>
- <dd><p>Too-late Packet Drop. When enabled on receiver, it skips
- missing packets that have not been delivered in time and
- delivers the following packets to the application when
- their time-to-play has come. It also sends a fake ACK to
- the sender. When enabled on sender and enabled on the
- receiving peer, the sender drops the older packets that
- have no chance of being delivered in time. It was
- automatically enabled in the sender if the receiver
- supports it.
- </p>
- </dd>
- <dt><samp class="option">sndbuf=<var class="var">bytes</var></samp></dt>
- <dd><p>Set send buffer size, expressed in bytes.
- </p>
- </dd>
- <dt><samp class="option">rcvbuf=<var class="var">bytes</var></samp></dt>
- <dd><p>Set receive buffer size, expressed in bytes.
- </p>
- <p>Receive buffer must not be greater than <samp class="option">ffs</samp>.
- </p>
- </dd>
- <dt><samp class="option">lossmaxttl=<var class="var">packets</var></samp></dt>
- <dd><p>The value up to which the Reorder Tolerance may grow. When
- Reorder Tolerance is > 0, then packet loss report is delayed
- until that number of packets come in. Reorder Tolerance
- increases every time a "belated" packet has come, but it
- wasn’t due to retransmission (that is, when UDP packets tend
- to come out of order), with the difference between the latest
- sequence and this packet’s sequence, and not more than the
- value of this option. By default it’s 0, which means that this
- mechanism is turned off, and the loss report is always sent
- immediately upon experiencing a "gap" in sequences.
- </p>
- </dd>
- <dt><samp class="option">minversion</samp></dt>
- <dd><p>The minimum SRT version that is required from the peer. A connection
- to a peer that does not satisfy the minimum version requirement
- will be rejected.
- </p>
- <p>The version format in hex is 0xXXYYZZ for x.y.z in human readable
- form.
- </p>
- </dd>
- <dt><samp class="option">streamid=<var class="var">string</var></samp></dt>
- <dd><p>A string limited to 512 characters that can be set on the socket prior
- to connecting. This stream ID will be able to be retrieved by the
- listener side from the socket that is returned from srt_accept and
- was connected by a socket with that set stream ID. SRT does not enforce
- any special interpretation of the contents of this string.
- This option doesn’t make sense in Rendezvous connection; the result
- might be that simply one side will override the value from the other
- side and it’s the matter of luck which one would win
- </p>
- </dd>
- <dt><samp class="option">srt_streamid=<var class="var">string</var></samp></dt>
- <dd><p>Alias for ‘<samp class="samp">streamid</samp>’ to avoid conflict with ffmpeg command line option.
- </p>
- </dd>
- <dt><samp class="option">smoother=<var class="var">live|file</var></samp></dt>
- <dd><p>The type of Smoother used for the transmission for that socket, which
- is responsible for the transmission and congestion control. The Smoother
- type must be exactly the same on both connecting parties, otherwise
- the connection is rejected.
- </p>
- </dd>
- <dt><samp class="option">messageapi=<var class="var">1|0</var></samp></dt>
- <dd><p>When set, this socket uses the Message API, otherwise it uses Buffer
- API. Note that in live mode (see <samp class="option">transtype</samp>) there’s only
- message API available. In File mode you can chose to use one of two modes:
- </p>
- <p>Stream API (default, when this option is false). In this mode you may
- send as many data as you wish with one sending instruction, or even use
- dedicated functions that read directly from a file. The internal facility
- will take care of any speed and congestion control. When receiving, you
- can also receive as many data as desired, the data not extracted will be
- waiting for the next call. There is no boundary between data portions in
- the Stream mode.
- </p>
- <p>Message API. In this mode your single sending instruction passes exactly
- one piece of data that has boundaries (a message). Contrary to Live mode,
- this message may span across multiple UDP packets and the only size
- limitation is that it shall fit as a whole in the sending buffer. The
- receiver shall use as large buffer as necessary to receive the message,
- otherwise the message will not be given up. When the message is not
- complete (not all packets received or there was a packet loss) it will
- not be given up.
- </p>
- </dd>
- <dt><samp class="option">transtype=<var class="var">live|file</var></samp></dt>
- <dd><p>Sets the transmission type for the socket, in particular, setting this
- option sets multiple other parameters to their default values as required
- for a particular transmission type.
- </p>
- <p>live: Set options as for live transmission. In this mode, you should
- send by one sending instruction only so many data that fit in one UDP packet,
- and limited to the value defined first in <samp class="option">payload_size</samp> (1316 is
- default in this mode). There is no speed control in this mode, only the
- bandwidth control, if configured, in order to not exceed the bandwidth with
- the overhead transmission (retransmitted and control packets).
- </p>
- <p>file: Set options as for non-live transmission. See <samp class="option">messageapi</samp>
- for further explanations
- </p>
- </dd>
- <dt><samp class="option">linger=<var class="var">seconds</var></samp></dt>
- <dd><p>The number of seconds that the socket waits for unsent data when closing.
- Default is -1. -1 means auto (off with 0 seconds in live mode, on with 180
- seconds in file mode). The range for this option is integers in the
- 0 - <code class="code">INT_MAX</code>.
- </p>
- </dd>
- <dt><samp class="option">tsbpd=<var class="var">1|0</var></samp></dt>
- <dd><p>When true, use Timestamp-based Packet Delivery mode. The default behavior
- depends on the transmission type: enabled in live mode, disabled in file
- mode.
- </p>
- </dd>
- </dl>
- <p>For more information see: <a class="url" href="https://github.com/Haivision/srt">https://github.com/Haivision/srt</a>.
- </p>
- <a name="srtp"></a>
- <h3 class="section">24.38 srtp<span class="pull-right"><a class="anchor hidden-xs" href="#srtp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-srtp" aria-hidden="true">TOC</a></span></h3>
- <p>Secure Real-time Transport Protocol.
- </p>
- <p>The accepted options are:
- </p><dl class="table">
- <dt><samp class="option">srtp_in_suite</samp></dt>
- <dt><samp class="option">srtp_out_suite</samp></dt>
- <dd><p>Select input and output encoding suites.
- </p>
- <p>Supported values:
- </p><dl class="table">
- <dt>‘<samp class="samp">AES_CM_128_HMAC_SHA1_80</samp>’</dt>
- <dt>‘<samp class="samp">SRTP_AES128_CM_HMAC_SHA1_80</samp>’</dt>
- <dt>‘<samp class="samp">AES_CM_128_HMAC_SHA1_32</samp>’</dt>
- <dt>‘<samp class="samp">SRTP_AES128_CM_HMAC_SHA1_32</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">srtp_in_params</samp></dt>
- <dt><samp class="option">srtp_out_params</samp></dt>
- <dd><p>Set input and output encoding parameters, which are expressed by a
- base64-encoded representation of a binary block. The first 16 bytes of
- this binary block are used as master key, the following 14 bytes are
- used as master salt.
- </p></dd>
- </dl>
- <a name="subfile"></a>
- <h3 class="section">24.39 subfile<span class="pull-right"><a class="anchor hidden-xs" href="#subfile" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-subfile" aria-hidden="true">TOC</a></span></h3>
- <p>Virtually extract a segment of a file or another stream.
- The underlying stream must be seekable.
- </p>
- <p>Accepted options:
- </p><dl class="table">
- <dt><samp class="option">start</samp></dt>
- <dd><p>Start offset of the extracted segment, in bytes.
- </p></dd>
- <dt><samp class="option">end</samp></dt>
- <dd><p>End offset of the extracted segment, in bytes.
- If set to 0, extract till end of file.
- </p></dd>
- </dl>
- <p>Examples:
- </p>
- <p>Extract a chapter from a DVD VOB file (start and end sectors obtained
- externally and multiplied by 2048):
- </p><div class="example">
- <pre class="example-preformatted">subfile,,start,153391104,end,268142592,,:/media/dvd/VIDEO_TS/VTS_08_1.VOB
- </pre></div>
- <p>Play an AVI file directly from a TAR archive:
- </p><div class="example">
- <pre class="example-preformatted">subfile,,start,183241728,end,366490624,,:archive.tar
- </pre></div>
- <p>Play a MPEG-TS file from start offset till end:
- </p><div class="example">
- <pre class="example-preformatted">subfile,,start,32815239,end,0,,:video.ts
- </pre></div>
- <a name="tee-2"></a>
- <h3 class="section">24.40 tee<span class="pull-right"><a class="anchor hidden-xs" href="#tee-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tee-2" aria-hidden="true">TOC</a></span></h3>
- <p>Writes the output to multiple protocols. The individual outputs are separated
- by |
- </p>
- <div class="example">
- <pre class="example-preformatted">tee:file://path/to/local/this.avi|file://path/to/local/that.avi
- </pre></div>
- <a name="tcp"></a>
- <h3 class="section">24.41 tcp<span class="pull-right"><a class="anchor hidden-xs" href="#tcp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tcp" aria-hidden="true">TOC</a></span></h3>
- <p>Transmission Control Protocol.
- </p>
- <p>The required syntax for a TCP url is:
- </p><div class="example">
- <pre class="example-preformatted">tcp://<var class="var">hostname</var>:<var class="var">port</var>[?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">listen=<var class="var">2|1|0</var></samp></dt>
- <dd><p>Listen for an incoming connection. 0 disables listen, 1 enables listen in
- single client mode, 2 enables listen in multi-client mode. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">local_addr=<var class="var">addr</var></samp></dt>
- <dd><p>Local IP address of a network interface used for tcp socket connect.
- </p>
- </dd>
- <dt><samp class="option">local_port=<var class="var">port</var></samp></dt>
- <dd><p>Local port used for tcp socket connect.
- </p>
- </dd>
- <dt><samp class="option">timeout=<var class="var">microseconds</var></samp></dt>
- <dd><p>Set raise error timeout, expressed in microseconds.
- </p>
- <p>This option is only relevant in read mode: if no data arrived in more
- than this time interval, raise error.
- </p>
- </dd>
- <dt><samp class="option">listen_timeout=<var class="var">milliseconds</var></samp></dt>
- <dd><p>Set listen timeout, expressed in milliseconds.
- </p>
- </dd>
- <dt><samp class="option">recv_buffer_size=<var class="var">bytes</var></samp></dt>
- <dd><p>Set receive buffer size, expressed bytes.
- </p>
- </dd>
- <dt><samp class="option">send_buffer_size=<var class="var">bytes</var></samp></dt>
- <dd><p>Set send buffer size, expressed bytes.
- </p>
- </dd>
- <dt><samp class="option">tcp_nodelay=<var class="var">1|0</var></samp></dt>
- <dd><p>Set TCP_NODELAY to disable Nagle’s algorithm. Default value is 0.
- </p>
- <p><em class="emph">Remark: Writing to the socket is currently not optimized to minimize system calls and reduces the efficiency / effect of TCP_NODELAY.</em>
- </p>
- </dd>
- <dt><samp class="option">tcp_mss=<var class="var">bytes</var></samp></dt>
- <dd><p>Set maximum segment size for outgoing TCP packets, expressed in bytes.
- </p></dd>
- </dl>
- <p>The following example shows how to setup a listening TCP connection
- with <code class="command">ffmpeg</code>, which is then accessed with <code class="command">ffplay</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i <var class="var">input</var> -f <var class="var">format</var> tcp://<var class="var">hostname</var>:<var class="var">port</var>?listen
- ffplay tcp://<var class="var">hostname</var>:<var class="var">port</var>
- </pre></div>
- <a name="tls"></a>
- <h3 class="section">24.42 tls<span class="pull-right"><a class="anchor hidden-xs" href="#tls" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tls" aria-hidden="true">TOC</a></span></h3>
- <p>Transport Layer Security (TLS) / Secure Sockets Layer (SSL)
- </p>
- <p>The required syntax for a TLS/SSL url is:
- </p><div class="example">
- <pre class="example-preformatted">tls://<var class="var">hostname</var>:<var class="var">port</var>[?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">ca_file, cafile=<var class="var">filename</var></samp></dt>
- <dd><p>A file containing certificate authority (CA) root certificates to treat
- as trusted. If the linked TLS library contains a default this might not
- need to be specified for verification to work, but not all libraries and
- setups have defaults built in.
- The file must be in OpenSSL PEM format.
- </p>
- </dd>
- <dt><samp class="option">tls_verify, verify=<var class="var">1|0</var></samp></dt>
- <dd><p>If enabled, try to verify the peer that we are communicating with.
- Note, if using OpenSSL, this currently only makes sure that the
- peer certificate is signed by one of the root certificates in the CA
- database, but it does not validate that the certificate actually
- matches the host name we are trying to connect to. (With other backends,
- the host name is validated as well.)
- </p>
- <p>This is disabled by default since it requires a CA database to be
- provided by the caller in many cases.
- </p>
- </dd>
- <dt><samp class="option">cert_file, cert=<var class="var">filename</var></samp></dt>
- <dd><p>A file containing a certificate to use in the handshake with the peer.
- (When operating as server, in listen mode, this is more often required
- by the peer, while client certificates only are mandated in certain
- setups.)
- </p>
- </dd>
- <dt><samp class="option">key_file, key=<var class="var">filename</var></samp></dt>
- <dd><p>A file containing the private key for the certificate.
- </p>
- </dd>
- <dt><samp class="option">listen=<var class="var">1|0</var></samp></dt>
- <dd><p>If enabled, listen for connections on the provided port, and assume
- the server role in the handshake instead of the client role.
- </p>
- </dd>
- <dt><samp class="option">http_proxy</samp></dt>
- <dd><p>The HTTP proxy to tunnel through, e.g. <code class="code">http://example.com:1234</code>.
- The proxy must support the CONNECT method.
- </p>
- </dd>
- </dl>
- <p>Example command lines:
- </p>
- <p>To create a TLS/SSL server that serves an input stream.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i <var class="var">input</var> -f <var class="var">format</var> tls://<var class="var">hostname</var>:<var class="var">port</var>?listen&cert=<var class="var">server.crt</var>&key=<var class="var">server.key</var>
- </pre></div>
- <p>To play back a stream from the TLS/SSL server using <code class="command">ffplay</code>:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffplay tls://<var class="var">hostname</var>:<var class="var">port</var>
- </pre></div>
- <a name="dtls"></a>
- <h3 class="section">24.43 dtls<span class="pull-right"><a class="anchor hidden-xs" href="#dtls" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dtls" aria-hidden="true">TOC</a></span></h3>
- <p>Datagram Transport Layer Security (DTLS)
- </p>
- <p>The required syntax for a DTLS URL is:
- </p><div class="example">
- <pre class="example-preformatted">dtls://<var class="var">hostname</var>:<var class="var">port</var>[?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>DTLS shares most options with TLS, but operates over UDP instead of TCP.
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">ca_file, cafile=<var class="var">filename</var></samp></dt>
- <dd><p>A file containing certificate authority (CA) root certificates to treat
- as trusted. If the linked TLS library contains a default this might not
- need to be specified for verification to work, but not all libraries and
- setups have defaults built in.
- The file must be in OpenSSL PEM format.
- </p>
- </dd>
- <dt><samp class="option">tls_verify, verify=<var class="var">1|0</var></samp></dt>
- <dd><p>If enabled, try to verify the peer that we are communicating with.
- Note, if using OpenSSL, this currently only makes sure that the
- peer certificate is signed by one of the root certificates in the CA
- database, but it does not validate that the certificate actually
- matches the host name we are trying to connect to.
- </p>
- <p>This is disabled by default since it requires a CA database to be
- provided by the caller in many cases.
- </p>
- </dd>
- <dt><samp class="option">cert_file, cert=<var class="var">filename</var></samp></dt>
- <dd><p>A file containing a certificate to use in the handshake with the peer.
- (When operating as server, in listen mode, this is more often required
- by the peer, while client certificates only are mandated in certain
- setups.)
- </p>
- </dd>
- <dt><samp class="option">key_file, key=<var class="var">filename</var></samp></dt>
- <dd><p>A file containing the private key for the certificate.
- </p>
- </dd>
- <dt><samp class="option">cert_pem=<var class="var">string</var></samp></dt>
- <dd><p>Certificate PEM string
- </p>
- </dd>
- <dt><samp class="option">key_pem=<var class="var">string</var></samp></dt>
- <dd><p>Private key PEM string
- </p>
- </dd>
- <dt><samp class="option">listen=<var class="var">1|0</var></samp></dt>
- <dd><p>If enabled, listen for connections on the provided port, and assume
- the server role in the handshake instead of the client role.
- </p>
- </dd>
- <dt><samp class="option">mtu=<var class="var">size</var></samp></dt>
- <dd><p>Set the Maximum Transmission Unit (MTU) for DTLS packets.
- </p>
- </dd>
- <dt><samp class="option">use_srtp=<var class="var">1|0</var></samp></dt>
- <dd><p>Enable the use_srtp DTLS extension.
- This is used in WebRTC applications to establish SRTP encryption keys
- through the DTLS handshake. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">external_sock=<var class="var">1|0</var></samp></dt>
- <dd><p>Use an external socket instead of creating a new one.
- This option only makes sense to pass when interacting with the code via
- API, enabling this from CLI will cause immediate failure.
- Default is disabled.
- </p>
- </dd>
- </dl>
- <p>Example command lines:
- </p>
- <p>To create a DTLS server:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -listen 1 -i dtls://<var class="var">hostname</var>:<var class="var">port</var> <var class="var">output</var>
- </pre></div>
- <p>To create a DTLS client and send data to server:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i <var class="var">input</var> -f <var class="var">format</var> dtls://<var class="var">hostname</var>:<var class="var">port</var>
- </pre></div>
- <a name="udp"></a>
- <h3 class="section">24.44 udp<span class="pull-right"><a class="anchor hidden-xs" href="#udp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-udp" aria-hidden="true">TOC</a></span></h3>
- <p>User Datagram Protocol.
- </p>
- <p>The required syntax for an UDP URL is:
- </p><div class="example">
- <pre class="example-preformatted">udp://<var class="var">hostname</var>:<var class="var">port</var>[?<var class="var">options</var>]
- </pre></div>
- <p><var class="var">options</var> contains a list of &-separated options of the form
- <var class="var">key</var>=<var class="var">val</var>. Standard percent-encoding (and using the plus sign for
- space) can be used to escape keys and values.
- </p>
- <p>Options can also can be specified via command line options (or in code via
- <code class="code">AVOption</code>s).
- </p>
- <p>In case threading is enabled on the system, a circular buffer is used
- to store the incoming data, which allows one to reduce loss of data due to
- UDP socket buffer overruns. The <var class="var">fifo_size</var> and
- <var class="var">overrun_nonfatal</var> options are related to this buffer.
- </p>
- <p>The list of supported options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">buffer_size=<var class="var">size</var></samp></dt>
- <dd><p>Set the UDP maximum socket buffer size in bytes. This is used to set either
- the receive or send buffer size, depending on what the socket is used for.
- Default is 32 KB for output, 384 KB for input. See also <var class="var">fifo_size</var>.
- </p>
- </dd>
- <dt><samp class="option">bitrate=<var class="var">bitrate</var></samp></dt>
- <dd><p>If set to nonzero, the output will have the specified constant bitrate if the
- input has enough packets to sustain it.
- </p>
- </dd>
- <dt><samp class="option">burst_bits=<var class="var">bits</var></samp></dt>
- <dd><p>When using <var class="var">bitrate</var> this specifies the maximum number of bits in
- packet bursts.
- </p>
- </dd>
- <dt><samp class="option">localport=<var class="var">port</var></samp></dt>
- <dd><p>Override the local UDP port to bind with.
- </p>
- </dd>
- <dt><samp class="option">localaddr=<var class="var">addr</var></samp></dt>
- <dd><p>Local IP address of a network interface used for sending packets or joining
- multicast groups.
- </p>
- </dd>
- <dt><samp class="option">pkt_size=<var class="var">size</var></samp></dt>
- <dd><p>Set the size in bytes of UDP packets.
- </p>
- </dd>
- <dt><samp class="option">reuse=<var class="var">1|0</var></samp></dt>
- <dd><p>Explicitly allow or disallow reusing UDP sockets.
- </p>
- </dd>
- <dt><samp class="option">ttl=<var class="var">ttl</var></samp></dt>
- <dd><p>Set the time to live value (for multicast only).
- </p>
- </dd>
- <dt><samp class="option">dscp=<var class="var">dscp</var></samp></dt>
- <dd><p>Set the 6-bit DSCP field for outgoing packets.
- </p>
- </dd>
- <dt><samp class="option">connect=<var class="var">1|0</var></samp></dt>
- <dd><p>Initialize the UDP socket with <code class="code">connect()</code>. In this case, the
- destination address can’t be changed with ff_udp_set_remote_url later.
- If the destination address isn’t known at the start, this option can
- be specified in ff_udp_set_remote_url, too.
- This allows finding out the source address for the packets with getsockname,
- and makes writes return with AVERROR(ECONNREFUSED) if "destination
- unreachable" is received.
- For receiving, this gives the benefit of only receiving packets from
- the specified peer address/port.
- </p>
- </dd>
- <dt><samp class="option">sources=<var class="var">address</var>[,<var class="var">address</var>]</samp></dt>
- <dd><p>Only receive packets sent from the specified addresses. In case of multicast,
- also subscribe to multicast traffic coming from these addresses only.
- </p>
- </dd>
- <dt><samp class="option">block=<var class="var">address</var>[,<var class="var">address</var>]</samp></dt>
- <dd><p>Ignore packets sent from the specified addresses. In case of multicast, also
- exclude the source addresses in the multicast subscription.
- </p>
- </dd>
- <dt><samp class="option">fifo_size=<var class="var">units</var></samp></dt>
- <dd><p>Set the UDP receiving circular buffer size, expressed as a number of
- packets with size of 188 bytes. If not specified defaults to 7*4096.
- </p>
- </dd>
- <dt><samp class="option">overrun_nonfatal=<var class="var">1|0</var></samp></dt>
- <dd><p>Survive in case of UDP receiving circular buffer overrun. Default
- value is 0.
- </p>
- </dd>
- <dt><samp class="option">timeout=<var class="var">microseconds</var></samp></dt>
- <dd><p>Set raise error timeout, expressed in microseconds.
- </p>
- <p>This option is only relevant in read mode: if no data arrived in more
- than this time interval, raise error.
- </p>
- </dd>
- <dt><samp class="option">broadcast=<var class="var">1|0</var></samp></dt>
- <dd><p>Explicitly allow or disallow UDP broadcasting.
- </p>
- <p>Note that broadcasting may not work properly on networks having
- a broadcast storm protection.
- </p></dd>
- </dl>
- <a name="Examples-29"></a>
- <h4 class="subsection">24.44.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-29" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-29" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> to stream over UDP to a remote endpoint:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i <var class="var">input</var> -f <var class="var">format</var> udp://<var class="var">hostname</var>:<var class="var">port</var>
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to stream in mpegts format over UDP using 188
- sized UDP packets, using a large input buffer:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i <var class="var">input</var> -f mpegts udp://<var class="var">hostname</var>:<var class="var">port</var>?pkt_size=188&buffer_size=65535
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to receive over UDP from a remote endpoint:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i udp://[<var class="var">multicast-address</var>]:<var class="var">port</var> ...
- </pre></div>
- </li></ul>
- <a name="unix"></a>
- <h3 class="section">24.45 unix<span class="pull-right"><a class="anchor hidden-xs" href="#unix" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-unix" aria-hidden="true">TOC</a></span></h3>
- <p>Unix local socket
- </p>
- <p>The required syntax for a Unix socket URL is:
- </p>
- <div class="example">
- <pre class="example-preformatted">unix://<var class="var">filepath</var>
- </pre></div>
- <p>The following parameters can be set via command line options
- (or in code via <code class="code">AVOption</code>s):
- </p>
- <dl class="table">
- <dt><samp class="option">timeout</samp></dt>
- <dd><p>Timeout in ms.
- </p></dd>
- <dt><samp class="option">listen</samp></dt>
- <dd><p>Create the Unix socket in listening mode.
- </p></dd>
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>Maximum packet size for packet-oriented sockets (SOCK_DGRAM and
- SOCK_SEQPACKET). If greater than zero, this value is used as
- <code class="code">max_packet_size</code>. Ignored for SOCK_STREAM. Default is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="zmq"></a>
- <h3 class="section">24.46 zmq<span class="pull-right"><a class="anchor hidden-xs" href="#zmq" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-zmq" aria-hidden="true">TOC</a></span></h3>
- <p>ZeroMQ asynchronous messaging using the libzmq library.
- </p>
- <p>This library supports unicast streaming to multiple clients without relying on
- an external server.
- </p>
- <p>The required syntax for streaming or connecting to a stream is:
- </p><div class="example">
- <pre class="example-preformatted">zmq:tcp://ip-address:port
- </pre></div>
- <p>Example:
- Create a localhost stream on port 5555:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i input -f mpegts zmq:tcp://127.0.0.1:5555
- </pre></div>
- <p>Multiple clients may connect to the stream using:
- </p><div class="example">
- <pre class="example-preformatted">ffplay zmq:tcp://127.0.0.1:5555
- </pre></div>
- <p>Streaming to multiple clients is implemented using a ZeroMQ Pub-Sub pattern.
- The server side binds to a port and publishes data. Clients connect to the
- server (via IP address/port) and subscribe to the stream. The order in which
- the server and client start generally does not matter.
- </p>
- <p>ffmpeg must be compiled with the –enable-libzmq option to support
- this protocol.
- </p>
- <p>Options can be set on the <code class="command">ffmpeg</code>/<code class="command">ffplay</code> command
- line. The following options are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>Forces the maximum packet size for sending/receiving data. The default value is
- 131,072 bytes. On the server side, this sets the maximum size of sent packets
- via ZeroMQ. On the clients, it sets an internal buffer size for receiving
- packets. Note that pkt_size on the clients should be equal to or greater than
- pkt_size on the server. Otherwise the received message may be truncated causing
- decoding errors.
- </p>
- </dd>
- </dl>
- <a name="Device-Options"></a>
- <h2 class="chapter">25 Device Options<span class="pull-right"><a class="anchor hidden-xs" href="#Device-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Device-Options" aria-hidden="true">TOC</a></span></h2>
- <p>The libavdevice library provides the same interface as
- libavformat. Namely, an input device is considered like a demuxer, and
- an output device like a muxer, and the interface and generic device
- options are the same provided by libavformat (see the ffmpeg-formats
- manual).
- </p>
- <p>In addition each input or output device may support so-called private
- options, which are specific for that component.
- </p>
- <p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
- FFmpeg tools, or by setting the value explicitly in the device
- <code class="code">AVFormatContext</code> options or using the <samp class="file">libavutil/opt.h</samp> API
- for programmatic use.
- </p>
- <a name="Input-Devices"></a>
- <h2 class="chapter">26 Input Devices<span class="pull-right"><a class="anchor hidden-xs" href="#Input-Devices" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Input-Devices" aria-hidden="true">TOC</a></span></h2>
- <p>Input devices are configured elements in FFmpeg which enable accessing
- the data coming from a multimedia device attached to your system.
- </p>
- <p>When you configure your FFmpeg build, all the supported input devices
- are enabled by default. You can list all available ones using the
- configure option "–list-indevs".
- </p>
- <p>You can disable all the input devices using the configure option
- "–disable-indevs", and selectively enable an input device using the
- option "–enable-indev=<var class="var">INDEV</var>", or you can disable a particular
- input device using the option "–disable-indev=<var class="var">INDEV</var>".
- </p>
- <p>The option "-devices" of the ff* tools will display the list of
- supported input devices.
- </p>
- <p>A description of the currently available input devices follows.
- </p>
- <a name="alsa"></a>
- <h3 class="section">26.1 alsa<span class="pull-right"><a class="anchor hidden-xs" href="#alsa" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alsa" aria-hidden="true">TOC</a></span></h3>
- <p>ALSA (Advanced Linux Sound Architecture) input device.
- </p>
- <p>To enable this input device during configuration you need libasound
- installed on your system.
- </p>
- <p>This device allows capturing from an ALSA device. The name of the
- device to capture has to be an ALSA card identifier.
- </p>
- <p>An ALSA identifier has the syntax:
- </p><div class="example">
- <pre class="example-preformatted">hw:<var class="var">CARD</var>[,<var class="var">DEV</var>[,<var class="var">SUBDEV</var>]]
- </pre></div>
- <p>where the <var class="var">DEV</var> and <var class="var">SUBDEV</var> components are optional.
- </p>
- <p>The three arguments (in order: <var class="var">CARD</var>,<var class="var">DEV</var>,<var class="var">SUBDEV</var>)
- specify card number or identifier, device number and subdevice number
- (-1 means any).
- </p>
- <p>To see the list of cards currently recognized by your system check the
- files <samp class="file">/proc/asound/cards</samp> and <samp class="file">/proc/asound/devices</samp>.
- </p>
- <p>For example to capture with <code class="command">ffmpeg</code> from an ALSA device with
- card id 0, you may run the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f alsa -i hw:0 alsaout.wav
- </pre></div>
- <p>For more information see:
- <a class="url" href="http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html">http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html</a>
- </p>
- <a name="Options-94"></a>
- <h4 class="subsection">26.1.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-94" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-94" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sample rate in Hz. Default is 48000.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of channels. Default is 2.
- </p>
- </dd>
- </dl>
- <a name="android_005fcamera"></a>
- <h3 class="section">26.2 android_camera<span class="pull-right"><a class="anchor hidden-xs" href="#android_005fcamera" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-android_005fcamera" aria-hidden="true">TOC</a></span></h3>
- <p>Android camera input device.
- </p>
- <p>This input devices uses the Android Camera2 NDK API which is
- available on devices with API level 24+. The availability of
- android_camera is autodetected during configuration.
- </p>
- <p>This device allows capturing from all cameras on an Android device,
- which are integrated into the Camera2 NDK API.
- </p>
- <p>The available cameras are enumerated internally and can be selected
- with the <var class="var">camera_index</var> parameter. The input file string is
- discarded.
- </p>
- <p>Generally the back facing camera has index 0 while the front facing
- camera has index 1.
- </p>
- <a name="Options-95"></a>
- <h4 class="subsection">26.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-95" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-95" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video size given as a string such as 640x480 or hd720.
- Falls back to the first available configuration reported by
- Android if requested video size is not available or by default.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the video framerate.
- Falls back to the first available configuration reported by
- Android if requested framerate is not available or by default (-1).
- </p>
- </dd>
- <dt><samp class="option">camera_index</samp></dt>
- <dd><p>Set the index of the camera to use. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">input_queue_size</samp></dt>
- <dd><p>Set the maximum number of frames to buffer. Default is 5.
- </p>
- </dd>
- </dl>
- <a name="avfoundation"></a>
- <h3 class="section">26.3 avfoundation<span class="pull-right"><a class="anchor hidden-xs" href="#avfoundation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avfoundation" aria-hidden="true">TOC</a></span></h3>
- <p>AVFoundation input device.
- </p>
- <p>AVFoundation is the currently recommended framework by Apple for streamgrabbing on OSX >= 10.7 as well as on iOS.
- </p>
- <p>The input filename has to be given in the following syntax:
- </p><div class="example">
- <pre class="example-preformatted">-i "[[VIDEO]:[AUDIO]]"
- </pre></div>
- <p>The first entry selects the video input while the latter selects the audio input.
- The stream has to be specified by the device name or the device index as shown by the device list.
- Alternatively, the video and/or audio input device can be chosen by index using the
- <samp class="option">
- -video_device_index <INDEX>
- </samp>
- and/or
- <samp class="option">
- -audio_device_index <INDEX>
- </samp>
- , overriding any
- device name or index given in the input filename.
- </p>
- <p>All available devices can be enumerated by using <samp class="option">-list_devices true</samp>, listing
- all device names and corresponding indices.
- </p>
- <p>There are two device name aliases:
- </p><dl class="table">
- <dt><code class="code">default</code></dt>
- <dd><p>Select the AVFoundation default device of the corresponding type.
- </p>
- </dd>
- <dt><code class="code">none</code></dt>
- <dd><p>Do not record the corresponding media type.
- This is equivalent to specifying an empty device name or index.
- </p>
- </dd>
- </dl>
- <a name="Options-96"></a>
- <h4 class="subsection">26.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-96" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-96" aria-hidden="true">TOC</a></span></h4>
- <p>AVFoundation supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">-list_devices <TRUE|FALSE></samp></dt>
- <dd><p>If set to true, a list of all available input devices is given showing all
- device names and indices.
- </p>
- </dd>
- <dt><samp class="option">-video_device_index <INDEX></samp></dt>
- <dd><p>Specify the video device by its index. Overrides anything given in the input filename.
- </p>
- </dd>
- <dt><samp class="option">-audio_device_index <INDEX></samp></dt>
- <dd><p>Specify the audio device by its index. Overrides anything given in the input filename.
- </p>
- </dd>
- <dt><samp class="option">-pixel_format <FORMAT></samp></dt>
- <dd><p>Request the video device to use a specific pixel format.
- If the specified format is not supported, a list of available formats is given
- and the first one in this list is used instead. Available pixel formats are:
- <code class="code">monob, rgb555be, rgb555le, rgb565be, rgb565le, rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0,
- bgr48be, uyvy422, yuva444p, yuva444p16le, yuv444p, yuv422p16, yuv422p10, yuv444p10,
- yuv420p, nv12, yuyv422, gray</code>
- </p>
- </dd>
- <dt><samp class="option">-framerate</samp></dt>
- <dd><p>Set the grabbing frame rate. Default is <code class="code">ntsc</code>, corresponding to a
- frame rate of <code class="code">30000/1001</code>.
- </p>
- </dd>
- <dt><samp class="option">-video_size</samp></dt>
- <dd><p>Set the video frame size.
- </p>
- </dd>
- <dt><samp class="option">-capture_cursor</samp></dt>
- <dd><p>Capture the mouse pointer. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">-capture_mouse_clicks</samp></dt>
- <dd><p>Capture the screen mouse clicks. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">-capture_raw_data</samp></dt>
- <dd><p>Capture the raw device data. Default is 0.
- Using this option may result in receiving the underlying data delivered to the AVFoundation framework. E.g. for muxed devices that sends raw DV data to the framework (like tape-based camcorders), setting this option to false results in extracted video frames captured in the designated pixel format only. Setting this option to true results in receiving the raw DV stream untouched.
- </p></dd>
- </dl>
- <a name="Examples-30"></a>
- <h4 class="subsection">26.3.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-30" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-30" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Print the list of AVFoundation supported devices and exit:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f avfoundation -list_devices true -i ""
- </pre></div>
- </li><li>Record video from video device 0 and audio from audio device 0 into out.avi:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f avfoundation -i "0:0" out.avi
- </pre></div>
- </li><li>Record video from video device 2 and audio from audio device 1 into out.avi:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f avfoundation -video_device_index 2 -i ":1" out.avi
- </pre></div>
- </li><li>Record video from the system default video device using the pixel format bgr0 and do not record any audio into out.avi:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f avfoundation -pixel_format bgr0 -i "default:none" out.avi
- </pre></div>
- </li><li>Record raw DV data from a suitable input device and write the output into out.dv:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f avfoundation -capture_raw_data true -i "zr100:none" out.dv
- </pre></div>
- </li></ul>
- <a name="decklink"></a>
- <h3 class="section">26.4 decklink<span class="pull-right"><a class="anchor hidden-xs" href="#decklink" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-decklink" aria-hidden="true">TOC</a></span></h3>
- <p>The decklink input device provides capture capabilities for Blackmagic
- DeckLink devices.
- </p>
- <p>To enable this input device, you need the Blackmagic DeckLink SDK and you
- need to configure with the appropriate <code class="code">--extra-cflags</code>
- and <code class="code">--extra-ldflags</code>.
- On Windows, you need to run the IDL files through <code class="command">widl</code>.
- </p>
- <p>DeckLink is very picky about the formats it supports. Pixel format of the
- input can be set with <samp class="option">raw_format</samp>.
- Framerate and video size must be determined for your device with
- <code class="command">-list_formats 1</code>. Audio sample rate is always 48 kHz and the number
- of channels can be 2, 8 or 16. Note that all audio channels are bundled in one single
- audio track.
- </p>
- <a name="Options-97"></a>
- <h4 class="subsection">26.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-97" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-97" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">list_devices</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of devices and exit.
- Defaults to <samp class="option">false</samp>. This option is deprecated, please use the
- <code class="code">-sources</code> option of ffmpeg to list the available input devices.
- </p>
- </dd>
- <dt><samp class="option">list_formats</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of supported formats and exit.
- Defaults to <samp class="option">false</samp>.
- </p>
- </dd>
- <dt><samp class="option">format_code <FourCC></samp></dt>
- <dd><p>This sets the input video format to the format given by the FourCC. To see
- the supported values of your device(s) use <samp class="option">list_formats</samp>.
- Note that there is a FourCC <samp class="option">'pal '</samp> that can also be used
- as <samp class="option">pal</samp> (3 letters).
- Default behavior is autodetection of the input video format, if the hardware
- supports it.
- </p>
- </dd>
- <dt><samp class="option">raw_format</samp></dt>
- <dd><p>Set the pixel format of the captured video.
- Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd>
- <p>This is the default which means 8-bit YUV 422 or 8-bit ARGB if format
- autodetection is used, 8-bit YUV 422 otherwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">uyvy422</samp>’</dt>
- <dd>
- <p>8-bit YUV 422.
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv422p10</samp>’</dt>
- <dd>
- <p>10-bit YUV 422.
- </p>
- </dd>
- <dt>‘<samp class="samp">argb</samp>’</dt>
- <dd>
- <p>8-bit RGB.
- </p>
- </dd>
- <dt>‘<samp class="samp">bgra</samp>’</dt>
- <dd>
- <p>8-bit RGB.
- </p>
- </dd>
- <dt>‘<samp class="samp">rgb10</samp>’</dt>
- <dd>
- <p>10-bit RGB.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">teletext_lines</samp></dt>
- <dd><p>If set to nonzero, an additional teletext stream will be captured from the
- vertical ancillary data. Both SD PAL (576i) and HD (1080i or 1080p)
- sources are supported. In case of HD sources, OP47 packets are decoded.
- </p>
- <p>This option is a bitmask of the SD PAL VBI lines captured, specifically lines 6
- to 22, and lines 318 to 335. Line 6 is the LSB in the mask. Selected lines
- which do not contain teletext information will be ignored. You can use the
- special <samp class="option">all</samp> constant to select all possible lines, or
- <samp class="option">standard</samp> to skip lines 6, 318 and 319, which are not compatible with
- all receivers.
- </p>
- <p>For SD sources, ffmpeg needs to be compiled with <code class="code">--enable-libzvbi</code>. For
- HD sources, on older (pre-4K) DeckLink card models you have to capture in 10
- bit mode.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Defines number of audio channels to capture. Must be ‘<samp class="samp">2</samp>’, ‘<samp class="samp">8</samp>’ or ‘<samp class="samp">16</samp>’.
- Defaults to ‘<samp class="samp">2</samp>’.
- </p>
- </dd>
- <dt><samp class="option">duplex_mode</samp></dt>
- <dd><p>Sets the decklink device duplex/profile mode. Must be ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">half</samp>’, ‘<samp class="samp">full</samp>’,
- ‘<samp class="samp">one_sub_device_full</samp>’, ‘<samp class="samp">one_sub_device_half</samp>’, ‘<samp class="samp">two_sub_device_full</samp>’,
- ‘<samp class="samp">four_sub_device_half</samp>’
- Defaults to ‘<samp class="samp">unset</samp>’.
- </p>
- <p>Note: DeckLink SDK 11.0 have replaced the duplex property by a profile property.
- For the DeckLink Duo 2 and DeckLink Quad 2, a profile is shared between any 2
- sub-devices that utilize the same connectors. For the DeckLink 8K Pro, a profile
- is shared between all 4 sub-devices. So DeckLink 8K Pro support four profiles.
- </p>
- <p>Valid profile modes for DeckLink 8K Pro(with DeckLink SDK >= 11.0):
- ‘<samp class="samp">one_sub_device_full</samp>’, ‘<samp class="samp">one_sub_device_half</samp>’, ‘<samp class="samp">two_sub_device_full</samp>’,
- ‘<samp class="samp">four_sub_device_half</samp>’
- </p>
- <p>Valid profile modes for DeckLink Quad 2 and DeckLink Duo 2:
- ‘<samp class="samp">half</samp>’, ‘<samp class="samp">full</samp>’
- </p>
- </dd>
- <dt><samp class="option">timecode_format</samp></dt>
- <dd><p>Timecode type to include in the frame and video stream metadata. Must be
- ‘<samp class="samp">none</samp>’, ‘<samp class="samp">rp188vitc</samp>’, ‘<samp class="samp">rp188vitc2</samp>’, ‘<samp class="samp">rp188ltc</samp>’,
- ‘<samp class="samp">rp188hfr</samp>’, ‘<samp class="samp">rp188any</samp>’, ‘<samp class="samp">vitc</samp>’, ‘<samp class="samp">vitc2</samp>’, or ‘<samp class="samp">serial</samp>’.
- Defaults to ‘<samp class="samp">none</samp>’ (not included).
- </p>
- <p>In order to properly support 50/60 fps timecodes, the ordering of the queried
- timecode types for ‘<samp class="samp">rp188any</samp>’ is HFR, VITC1, VITC2 and LTC for >30 fps
- content. Note that this is slightly different to the ordering used by the
- DeckLink API, which is HFR, VITC1, LTC, VITC2.
- </p>
- </dd>
- <dt><samp class="option">video_input</samp></dt>
- <dd><p>Sets the video input source. Must be ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">sdi</samp>’, ‘<samp class="samp">hdmi</samp>’,
- ‘<samp class="samp">optical_sdi</samp>’, ‘<samp class="samp">component</samp>’, ‘<samp class="samp">composite</samp>’ or ‘<samp class="samp">s_video</samp>’.
- Defaults to ‘<samp class="samp">unset</samp>’.
- </p>
- </dd>
- <dt><samp class="option">audio_input</samp></dt>
- <dd><p>Sets the audio input source. Must be ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">embedded</samp>’,
- ‘<samp class="samp">aes_ebu</samp>’, ‘<samp class="samp">analog</samp>’, ‘<samp class="samp">analog_xlr</samp>’, ‘<samp class="samp">analog_rca</samp>’ or
- ‘<samp class="samp">microphone</samp>’. Defaults to ‘<samp class="samp">unset</samp>’.
- </p>
- </dd>
- <dt><samp class="option">video_pts</samp></dt>
- <dd><p>Sets the video packet timestamp source. Must be ‘<samp class="samp">video</samp>’, ‘<samp class="samp">audio</samp>’,
- ‘<samp class="samp">reference</samp>’, ‘<samp class="samp">wallclock</samp>’ or ‘<samp class="samp">abs_wallclock</samp>’.
- Defaults to ‘<samp class="samp">video</samp>’.
- </p>
- </dd>
- <dt><samp class="option">audio_pts</samp></dt>
- <dd><p>Sets the audio packet timestamp source. Must be ‘<samp class="samp">video</samp>’, ‘<samp class="samp">audio</samp>’,
- ‘<samp class="samp">reference</samp>’, ‘<samp class="samp">wallclock</samp>’ or ‘<samp class="samp">abs_wallclock</samp>’.
- Defaults to ‘<samp class="samp">audio</samp>’.
- </p>
- </dd>
- <dt><samp class="option">draw_bars</samp></dt>
- <dd><p>If set to ‘<samp class="samp">true</samp>’, color bars are drawn in the event of a signal loss.
- Defaults to ‘<samp class="samp">true</samp>’.
- This option is deprecated, please use the <code class="code">signal_loss_action</code> option.
- </p>
- </dd>
- <dt><samp class="option">signal_loss_action</samp></dt>
- <dd><p>Sets the action to take in the event of a signal loss. Accepts one of the
- following values:
- </p>
- <dl class="table">
- <dt><samp class="option">1, none</samp></dt>
- <dd><p>Do nothing on signal loss. This usually results in black frames.
- </p></dd>
- <dt><samp class="option">2, bars</samp></dt>
- <dd><p>Draw color bars on signal loss. Only supported for 8-bit input signals.
- </p></dd>
- <dt><samp class="option">3, repeat</samp></dt>
- <dd><p>Repeat the last video frame on signal loss.
- </p></dd>
- </dl>
- <p>Defaults to ‘<samp class="samp">bars</samp>’.
- </p>
- </dd>
- <dt><samp class="option">queue_size</samp></dt>
- <dd><p>Sets maximum input buffer size in bytes. If the buffering reaches this value,
- incoming frames will be dropped.
- Defaults to ‘<samp class="samp">1073741824</samp>’.
- </p>
- </dd>
- <dt><samp class="option">audio_depth</samp></dt>
- <dd><p>Sets the audio sample bit depth. Must be ‘<samp class="samp">16</samp>’ or ‘<samp class="samp">32</samp>’.
- Defaults to ‘<samp class="samp">16</samp>’.
- </p>
- </dd>
- <dt><samp class="option">decklink_copyts</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, timestamps are forwarded as they are without removing
- the initial offset.
- Defaults to <samp class="option">false</samp>.
- </p>
- </dd>
- <dt><samp class="option">timestamp_align</samp></dt>
- <dd><p>Capture start time alignment in seconds. If set to nonzero, input frames are
- dropped till the system timestamp aligns with configured value.
- Alignment difference of up to one frame duration is tolerated.
- This is useful for maintaining input synchronization across N different
- hardware devices deployed for ’N-way’ redundancy. The system time of different
- hardware devices should be synchronized with protocols such as NTP or PTP,
- before using this option.
- Note that this method is not foolproof. In some border cases input
- synchronization may not happen due to thread scheduling jitters in the OS.
- Either sync could go wrong by 1 frame or in a rarer case
- <samp class="option">timestamp_align</samp> seconds.
- Defaults to ‘<samp class="samp">0</samp>’.
- </p>
- </dd>
- <dt><samp class="option">wait_for_tc (<em class="emph">bool</em>)</samp></dt>
- <dd><p>Drop frames till a frame with timecode is received. Sometimes serial timecode
- isn’t received with the first input frame. If that happens, the stored stream
- timecode will be inaccurate. If this option is set to <samp class="option">true</samp>, input frames
- are dropped till a frame with timecode is received.
- Option <var class="var">timecode_format</var> must be specified.
- Defaults to <samp class="option">false</samp>.
- </p>
- </dd>
- <dt><samp class="option">enable_klv(<em class="emph">bool</em>)</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, extracts KLV data from VANC and outputs KLV packets.
- KLV VANC packets are joined based on MID and PSC fields and aggregated into
- one KLV packet.
- Defaults to <samp class="option">false</samp>.
- </p>
- </dd>
- </dl>
- <a name="Examples-31"></a>
- <h4 class="subsection">26.4.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-31" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-31" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>List input devices:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -sources decklink
- </pre></div>
- </li><li>List supported formats:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
- </pre></div>
- </li><li>Capture video clip at 1080i50:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -format_code Hi50 -f decklink -i 'Intensity Pro' -c:a copy -c:v copy output.avi
- </pre></div>
- </li><li>Capture video clip at 1080i50 10 bit:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -raw_format yuv422p10 -format_code Hi50 -f decklink -i 'UltraStudio Mini Recorder' -c:a copy -c:v copy output.avi
- </pre></div>
- </li><li>Capture video clip at 1080i50 with 16 audio channels:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -channels 16 -format_code Hi50 -f decklink -i 'UltraStudio Mini Recorder' -c:a copy -c:v copy output.avi
- </pre></div>
- </li></ul>
- <a name="dshow"></a>
- <h3 class="section">26.5 dshow<span class="pull-right"><a class="anchor hidden-xs" href="#dshow" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dshow" aria-hidden="true">TOC</a></span></h3>
- <p>Windows DirectShow input device.
- </p>
- <p>DirectShow support is enabled when FFmpeg is built with the mingw-w64 project.
- Currently only audio and video devices are supported.
- </p>
- <p>Multiple devices may be opened as separate inputs, but they may also be
- opened on the same input, which should improve synchronism between them.
- </p>
- <p>The input name should be in the format:
- </p>
- <div class="example">
- <pre class="example-preformatted"><var class="var">TYPE</var>=<var class="var">NAME</var>[:<var class="var">TYPE</var>=<var class="var">NAME</var>]
- </pre></div>
- <p>where <var class="var">TYPE</var> can be either <var class="var">audio</var> or <var class="var">video</var>,
- and <var class="var">NAME</var> is the device’s name or alternative name..
- </p>
- <a name="Options-98"></a>
- <h4 class="subsection">26.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-98" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-98" aria-hidden="true">TOC</a></span></h4>
- <p>If no options are specified, the device’s defaults are used.
- If the device does not support the requested options, it will
- fail to open.
- </p>
- <dl class="table">
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video size in the captured video.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the frame rate in the captured video.
- </p>
- </dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sample rate (in Hz) of the captured audio.
- </p>
- </dd>
- <dt><samp class="option">sample_size</samp></dt>
- <dd><p>Set the sample size (in bits) of the captured audio.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of channels in the captured audio.
- </p>
- </dd>
- <dt><samp class="option">list_devices</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of devices and exit.
- </p>
- </dd>
- <dt><samp class="option">list_options</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of selected device’s options
- and exit.
- </p>
- </dd>
- <dt><samp class="option">video_device_number</samp></dt>
- <dd><p>Set video device number for devices with the same name (starts at 0,
- defaults to 0).
- </p>
- </dd>
- <dt><samp class="option">audio_device_number</samp></dt>
- <dd><p>Set audio device number for devices with the same name (starts at 0,
- defaults to 0).
- </p>
- </dd>
- <dt><samp class="option">pixel_format</samp></dt>
- <dd><p>Select pixel format to be used by DirectShow. This may only be set when
- the video codec is not set or set to rawvideo.
- </p>
- </dd>
- <dt><samp class="option">audio_buffer_size</samp></dt>
- <dd><p>Set audio device buffer size in milliseconds (which can directly
- impact latency, depending on the device).
- Defaults to using the audio device’s
- default buffer size (typically some multiple of 500ms).
- Setting this value too low can degrade performance.
- See also
- <a class="url" href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx">http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx</a>
- </p>
- </dd>
- <dt><samp class="option">video_pin_name</samp></dt>
- <dd><p>Select video capture pin to use by name or alternative name.
- </p>
- </dd>
- <dt><samp class="option">audio_pin_name</samp></dt>
- <dd><p>Select audio capture pin to use by name or alternative name.
- </p>
- </dd>
- <dt><samp class="option">crossbar_video_input_pin_number</samp></dt>
- <dd><p>Select video input pin number for crossbar device. This will be
- routed to the crossbar device’s Video Decoder output pin.
- Note that changing this value can affect future invocations
- (sets a new default) until system reboot occurs.
- </p>
- </dd>
- <dt><samp class="option">crossbar_audio_input_pin_number</samp></dt>
- <dd><p>Select audio input pin number for crossbar device. This will be
- routed to the crossbar device’s Audio Decoder output pin.
- Note that changing this value can affect future invocations
- (sets a new default) until system reboot occurs.
- </p>
- </dd>
- <dt><samp class="option">show_video_device_dialog</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, before capture starts, popup a display dialog
- to the end user, allowing them to change video filter properties
- and configurations manually.
- Note that for crossbar devices, adjusting values in this dialog
- may be needed at times to toggle between PAL (25 fps) and NTSC (29.97)
- input frame rates, sizes, interlacing, etc. Changing these values can
- enable different scan rates/frame rates and avoiding green bars at
- the bottom, flickering scan lines, etc.
- Note that with some devices, changing these properties can also affect future
- invocations (sets new defaults) until system reboot occurs.
- </p>
- </dd>
- <dt><samp class="option">show_audio_device_dialog</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, before capture starts, popup a display dialog
- to the end user, allowing them to change audio filter properties
- and configurations manually.
- </p>
- </dd>
- <dt><samp class="option">show_video_crossbar_connection_dialog</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, before capture starts, popup a display
- dialog to the end user, allowing them to manually
- modify crossbar pin routings, when it opens a video device.
- </p>
- </dd>
- <dt><samp class="option">show_audio_crossbar_connection_dialog</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, before capture starts, popup a display
- dialog to the end user, allowing them to manually
- modify crossbar pin routings, when it opens an audio device.
- </p>
- </dd>
- <dt><samp class="option">show_analog_tv_tuner_dialog</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, before capture starts, popup a display
- dialog to the end user, allowing them to manually
- modify TV channels and frequencies.
- </p>
- </dd>
- <dt><samp class="option">show_analog_tv_tuner_audio_dialog</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, before capture starts, popup a display
- dialog to the end user, allowing them to manually
- modify TV audio (like mono vs. stereo, Language A,B or C).
- </p>
- </dd>
- <dt><samp class="option">audio_device_load</samp></dt>
- <dd><p>Load an audio capture filter device from file instead of searching
- it by name. It may load additional parameters too, if the filter
- supports the serialization of its properties to.
- To use this an audio capture source has to be specified, but it can
- be anything even fake one.
- </p>
- </dd>
- <dt><samp class="option">audio_device_save</samp></dt>
- <dd><p>Save the currently used audio capture filter device and its
- parameters (if the filter supports it) to a file.
- If a file with the same name exists it will be overwritten.
- </p>
- </dd>
- <dt><samp class="option">video_device_load</samp></dt>
- <dd><p>Load a video capture filter device from file instead of searching
- it by name. It may load additional parameters too, if the filter
- supports the serialization of its properties to.
- To use this a video capture source has to be specified, but it can
- be anything even fake one.
- </p>
- </dd>
- <dt><samp class="option">video_device_save</samp></dt>
- <dd><p>Save the currently used video capture filter device and its
- parameters (if the filter supports it) to a file.
- If a file with the same name exists it will be overwritten.
- </p>
- </dd>
- <dt><samp class="option">use_video_device_timestamps</samp></dt>
- <dd><p>If set to <samp class="option">false</samp>, the timestamp for video frames will be
- derived from the wallclock instead of the timestamp provided by
- the capture device. This allows working around devices that
- provide unreliable timestamps.
- </p>
- </dd>
- </dl>
- <a name="Examples-32"></a>
- <h4 class="subsection">26.5.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-32" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-32" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Print the list of DirectShow supported devices and exit:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -list_devices true -f dshow -i dummy
- </pre></div>
- </li><li>Open video device <var class="var">Camera</var>:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f dshow -i video="Camera"
- </pre></div>
- </li><li>Open second video device with name <var class="var">Camera</var>:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
- </pre></div>
- </li><li>Open video device <var class="var">Camera</var> and audio device <var class="var">Microphone</var>:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f dshow -i video="Camera":audio="Microphone"
- </pre></div>
- </li><li>Print the list of supported options in selected device and exit:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -list_options true -f dshow -i video="Camera"
- </pre></div>
- </li><li>Specify pin names to capture by name or alternative name, specify alternative device name:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f dshow -audio_pin_name "Audio Out" -video_pin_name 2 -i video=video="@device_pnp_\\?\pci#ven_1a0a&dev_6200&subsys_62021461&rev_01#4&e2c7dd6&0&00e1#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}":audio="Microphone"
- </pre></div>
- </li><li>Configure a crossbar device, specifying crossbar pins, allow user to adjust video capture properties at startup:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_number 0
- -crossbar_audio_input_pin_number 3 -i video="AVerMedia BDA Analog Capture":audio="AVerMedia BDA Analog Capture"
- </pre></div>
- </li></ul>
- <a name="fbdev"></a>
- <h3 class="section">26.6 fbdev<span class="pull-right"><a class="anchor hidden-xs" href="#fbdev" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fbdev" aria-hidden="true">TOC</a></span></h3>
- <p>Linux framebuffer input device.
- </p>
- <p>The Linux framebuffer is a graphic hardware-independent abstraction
- layer to show graphics on a computer monitor, typically on the
- console. It is accessed through a file device node, usually
- <samp class="file">/dev/fb0</samp>.
- </p>
- <p>For more detailed information read the file
- Documentation/fb/framebuffer.txt included in the Linux source tree.
- </p>
- <p>See also <a class="url" href="http://linux-fbdev.sourceforge.net/">http://linux-fbdev.sourceforge.net/</a>, and fbset(1).
- </p>
- <p>To record from the framebuffer device <samp class="file">/dev/fb0</samp> with
- <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f fbdev -framerate 10 -i /dev/fb0 out.avi
- </pre></div>
- <p>You can take a single screenshot image with the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f fbdev -framerate 1 -i /dev/fb0 -frames:v 1 screenshot.jpeg
- </pre></div>
- <a name="Options-99"></a>
- <h4 class="subsection">26.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-99" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-99" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the frame rate. Default is 25.
- </p>
- </dd>
- </dl>
- <a name="gdigrab"></a>
- <h3 class="section">26.7 gdigrab<span class="pull-right"><a class="anchor hidden-xs" href="#gdigrab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gdigrab" aria-hidden="true">TOC</a></span></h3>
- <p>Win32 GDI-based screen capture device.
- </p>
- <p>This device allows you to capture a region of the display on Windows.
- </p>
- <p>Amongst options for the input filenames are such elements as:
- </p><div class="example">
- <pre class="example-preformatted">desktop
- </pre></div>
- <p>or
- </p><div class="example">
- <pre class="example-preformatted">title=<var class="var">window_title</var>
- </pre></div>
- <p>or
- </p><div class="example">
- <pre class="example-preformatted">hwnd=<var class="var">window_hwnd</var>
- </pre></div>
- <p>The first option will capture the entire desktop, or a fixed region of the
- desktop. The second and third options will instead capture the contents of a single
- window, regardless of its position on the screen.
- </p>
- <p>For example, to grab the entire desktop using <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg
- </pre></div>
- <p>Grab a 640x480 region at position <code class="code">10,20</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg
- </pre></div>
- <p>Grab the contents of the window named "Calculator"
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg
- </pre></div>
- <a name="Options-100"></a>
- <h4 class="subsection">26.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-100" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-100" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">draw_mouse</samp></dt>
- <dd><p>Specify whether to draw the mouse pointer. Use the value <code class="code">0</code> to
- not draw the pointer. Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the grabbing frame rate. Default value is <code class="code">ntsc</code>,
- corresponding to a frame rate of <code class="code">30000/1001</code>.
- </p>
- </dd>
- <dt><samp class="option">show_region</samp></dt>
- <dd><p>Show grabbed region on screen.
- </p>
- <p>If <var class="var">show_region</var> is specified with <code class="code">1</code>, then the grabbing
- region will be indicated on screen. With this option, it is easy to
- know what is being grabbed if only a portion of the screen is grabbed.
- </p>
- <p>Note that <var class="var">show_region</var> is incompatible with grabbing the contents
- of a single window.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y 20 -i desktop out.mpg
- </pre></div>
- </dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video frame size. The default is to capture the full screen if <samp class="file">desktop</samp> is selected, or the full window size if <samp class="file">title=<var class="var">window_title</var></samp> is selected.
- </p>
- </dd>
- <dt><samp class="option">offset_x</samp></dt>
- <dd><p>When capturing a region with <var class="var">video_size</var>, set the distance from the left edge of the screen or desktop.
- </p>
- <p>Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned to the left of your primary monitor, you will need to use a negative <var class="var">offset_x</var> value to move the region to that monitor.
- </p>
- </dd>
- <dt><samp class="option">offset_y</samp></dt>
- <dd><p>When capturing a region with <var class="var">video_size</var>, set the distance from the top edge of the screen or desktop.
- </p>
- <p>Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned above your primary monitor, you will need to use a negative <var class="var">offset_y</var> value to move the region to that monitor.
- </p>
- </dd>
- </dl>
- <a name="iec61883"></a>
- <h3 class="section">26.8 iec61883<span class="pull-right"><a class="anchor hidden-xs" href="#iec61883" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-iec61883" aria-hidden="true">TOC</a></span></h3>
- <p>FireWire DV/HDV input device using libiec61883.
- </p>
- <p>To enable this input device, you need libiec61883, libraw1394 and
- libavc1394 installed on your system. Use the configure option
- <code class="code">--enable-libiec61883</code> to compile with the device enabled.
- </p>
- <p>The iec61883 capture device supports capturing from a video device
- connected via IEEE1394 (FireWire), using libiec61883 and the new Linux
- FireWire stack (juju). This is the default DV/HDV input method in Linux
- Kernel 2.6.37 and later, since the old FireWire stack was removed.
- </p>
- <p>Specify the FireWire port to be used as input file, or "auto"
- to choose the first port connected.
- </p>
- <a name="Options-101"></a>
- <h4 class="subsection">26.8.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-101" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-101" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">dvtype</samp></dt>
- <dd><p>Override autodetection of DV/HDV. This should only be used if auto
- detection does not work, or if usage of a different device type
- should be prohibited. Treating a DV device as HDV (or vice versa) will
- not work and result in undefined behavior.
- The values <samp class="option">auto</samp>, <samp class="option">dv</samp> and <samp class="option">hdv</samp> are supported.
- </p>
- </dd>
- <dt><samp class="option">dvbuffer</samp></dt>
- <dd><p>Set maximum size of buffer for incoming data, in frames. For DV, this
- is an exact value. For HDV, it is not frame exact, since HDV does
- not have a fixed frame size.
- </p>
- </dd>
- <dt><samp class="option">dvguid</samp></dt>
- <dd><p>Select the capture device by specifying its GUID. Capturing will only
- be performed from the specified device and fails if no device with the
- given GUID is found. This is useful to select the input if multiple
- devices are connected at the same time.
- Look at /sys/bus/firewire/devices to find out the GUIDs.
- </p>
- </dd>
- </dl>
- <a name="Examples-33"></a>
- <h4 class="subsection">26.8.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-33" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-33" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Grab and show the input of a FireWire DV/HDV device.
- <div class="example">
- <pre class="example-preformatted">ffplay -f iec61883 -i auto
- </pre></div>
- </li><li>Grab and record the input of a FireWire DV/HDV device,
- using a packet buffer of 100000 packets if the source is HDV.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f iec61883 -i auto -dvbuffer 100000 out.mpg
- </pre></div>
- </li></ul>
- <a name="jack"></a>
- <h3 class="section">26.9 jack<span class="pull-right"><a class="anchor hidden-xs" href="#jack" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-jack" aria-hidden="true">TOC</a></span></h3>
- <p>JACK input device.
- </p>
- <p>To enable this input device during configuration you need libjack
- installed on your system.
- </p>
- <p>A JACK input device creates one or more JACK writable clients, one for
- each audio channel, with name <var class="var">client_name</var>:input_<var class="var">N</var>, where
- <var class="var">client_name</var> is the name provided by the application, and <var class="var">N</var>
- is a number which identifies the channel.
- Each writable client will send the acquired data to the FFmpeg input
- device.
- </p>
- <p>Once you have created one or more JACK readable clients, you need to
- connect them to one or more JACK writable clients.
- </p>
- <p>To connect or disconnect JACK clients you can use the <code class="command">jack_connect</code>
- and <code class="command">jack_disconnect</code> programs, or do it through a graphical interface,
- for example with <code class="command">qjackctl</code>.
- </p>
- <p>To list the JACK clients and their properties you can invoke the command
- <code class="command">jack_lsp</code>.
- </p>
- <p>Follows an example which shows how to capture a JACK readable client
- with <code class="command">ffmpeg</code>.
- </p><div class="example">
- <pre class="example-preformatted"># Create a JACK writable client with name "ffmpeg".
- $ ffmpeg -f jack -i ffmpeg -y out.wav
- # Start the sample jack_metro readable client.
- $ jack_metro -b 120 -d 0.2 -f 4000
- # List the current JACK clients.
- $ jack_lsp -c
- system:capture_1
- system:capture_2
- system:playback_1
- system:playback_2
- ffmpeg:input_1
- metro:120_bpm
- # Connect metro to the ffmpeg writable client.
- $ jack_connect metro:120_bpm ffmpeg:input_1
- </pre></div>
- <p>For more information read:
- <a class="url" href="http://jackaudio.org/">http://jackaudio.org/</a>
- </p>
- <a name="Options-102"></a>
- <h4 class="subsection">26.9.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-102" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-102" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of channels. Default is 2.
- </p>
- </dd>
- </dl>
- <a name="kmsgrab"></a>
- <h3 class="section">26.10 kmsgrab<span class="pull-right"><a class="anchor hidden-xs" href="#kmsgrab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-kmsgrab" aria-hidden="true">TOC</a></span></h3>
- <p>KMS video input device.
- </p>
- <p>Captures the KMS scanout framebuffer associated with a specified CRTC or plane as a
- DRM object that can be passed to other hardware functions.
- </p>
- <p>Requires either DRM master or CAP_SYS_ADMIN to run.
- </p>
- <p>If you don’t understand what all of that means, you probably don’t want this. Look at
- <samp class="option">x11grab</samp> instead.
- </p>
- <a name="Options-103"></a>
- <h4 class="subsection">26.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-103" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-103" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">device</samp></dt>
- <dd><p>DRM device to capture on. Defaults to <samp class="option">/dev/dri/card0</samp>.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Pixel format of the framebuffer. This can be autodetected if you are running Linux 5.7
- or later, but needs to be provided for earlier versions. Defaults to <samp class="option">bgr0</samp>,
- which is the most common format used by the Linux console and Xorg X server.
- </p>
- </dd>
- <dt><samp class="option">format_modifier</samp></dt>
- <dd><p>Format modifier to signal on output frames. This is necessary to import correctly into
- some APIs. It can be autodetected if you are running Linux 5.7 or later, but will need
- to be provided explicitly when needed in earlier versions. See the libdrm documentation
- for possible values.
- </p>
- </dd>
- <dt><samp class="option">crtc_id</samp></dt>
- <dd><p>KMS CRTC ID to define the capture source. The first active plane on the given CRTC
- will be used.
- </p>
- </dd>
- <dt><samp class="option">plane_id</samp></dt>
- <dd><p>KMS plane ID to define the capture source. Defaults to the first active plane found if
- neither <samp class="option">crtc_id</samp> nor <samp class="option">plane_id</samp> are specified.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Framerate to capture at. This is not synchronised to any page flipping or framebuffer
- changes - it just defines the interval at which the framebuffer is sampled. Sampling
- faster than the framebuffer update rate will generate independent frames with the same
- content. Defaults to <code class="code">30</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-34"></a>
- <h4 class="subsection">26.10.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-34" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-34" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Capture from the first active plane, download the result to normal frames and encode.
- This will only work if the framebuffer is both linear and mappable - if not, the result
- may be scrambled or fail to download.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f kmsgrab -i - -vf 'hwdownload,format=bgr0' output.mp4
- </pre></div>
- </li><li>Capture from CRTC ID 42 at 60fps, map the result to VAAPI, convert to NV12 and encode as H.264.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -crtc_id 42 -framerate 60 -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' -c:v h264_vaapi output.mp4
- </pre></div>
- </li><li>To capture only part of a plane the output can be cropped - this can be used to capture
- a single window, as long as it has a known absolute position and size. For example, to
- capture and encode the middle quarter of a 1920x1080 plane:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,crop=960:540:480:270,scale_vaapi=960:540:nv12' -c:v h264_vaapi output.mp4
- </pre></div>
- </li></ul>
- <a name="lavfi"></a>
- <h3 class="section">26.11 lavfi<span class="pull-right"><a class="anchor hidden-xs" href="#lavfi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lavfi" aria-hidden="true">TOC</a></span></h3>
- <p>Libavfilter input virtual device.
- </p>
- <p>This input device reads data from the open output pads of a libavfilter
- filtergraph.
- </p>
- <p>For each filtergraph open output, the input device will create a
- corresponding stream which is mapped to the generated output.
- The filtergraph is specified through the option <samp class="option">graph</samp>.
- </p>
- <a name="Options-104"></a>
- <h4 class="subsection">26.11.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-104" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-104" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">graph</samp></dt>
- <dd><p>Specify the filtergraph to use as input. Each video open output must be
- labelled by a unique string of the form "out<var class="var">N</var>", where <var class="var">N</var> is a
- number starting from 0 corresponding to the mapped input stream
- generated by the device.
- The first unlabelled output is automatically assigned to the "out0"
- label, but all the others need to be specified explicitly.
- </p>
- <p>The suffix "+subcc" can be appended to the output label to create an extra
- stream with the closed captions packets attached to that output
- (experimental; only for EIA-608 / CEA-708 for now).
- The subcc streams are created after all the normal streams, in the order of
- the corresponding stream.
- For example, if there is "out19+subcc", "out7+subcc" and up to "out42", the
- stream #43 is subcc for stream #7 and stream #44 is subcc for stream #19.
- </p>
- <p>If not specified defaults to the filename specified for the input
- device.
- </p>
- </dd>
- <dt><samp class="option">graph_file</samp></dt>
- <dd><p>Set the filename of the filtergraph to be read and sent to the other
- filters. Syntax of the filtergraph is the same as the one specified by
- the option <var class="var">graph</var>.
- </p>
- </dd>
- <dt><samp class="option">dumpgraph</samp></dt>
- <dd><p>Dump graph to stderr.
- </p>
- </dd>
- </dl>
- <a name="Examples-35"></a>
- <h4 class="subsection">26.11.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-35" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-35" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Create a color video stream and play it back with <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi -graph "color=c=pink [out0]" dummy
- </pre></div>
- </li><li>As the previous example, but use filename for specifying the graph
- description, and omit the "out0" label:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi color=c=pink
- </pre></div>
- </li><li>Create three different video test filtered sources and play them:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3
- </pre></div>
- </li><li>Read an audio stream from a file using the amovie source and play it
- back with <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi "amovie=test.wav"
- </pre></div>
- </li><li>Read an audio stream and a video stream and play it back with
- <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"
- </pre></div>
- </li><li>Dump decoded frames to images and Closed Captions to an RCWT backup:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i "movie=test.ts[out0+subcc]" -map v frame%08d.png -map s -c copy -f rcwt subcc.bin
- </pre></div>
- </li></ul>
- <a name="libcdio"></a>
- <h3 class="section">26.12 libcdio<span class="pull-right"><a class="anchor hidden-xs" href="#libcdio" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libcdio" aria-hidden="true">TOC</a></span></h3>
- <p>Audio-CD input device based on libcdio.
- </p>
- <p>To enable this input device during configuration you need libcdio
- installed on your system. It requires the configure option
- <code class="code">--enable-libcdio</code>.
- </p>
- <p>This device allows playing and grabbing from an Audio-CD.
- </p>
- <p>For example to copy with <code class="command">ffmpeg</code> the entire Audio-CD in <samp class="file">/dev/sr0</samp>,
- you may run the command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f libcdio -i /dev/sr0 cd.wav
- </pre></div>
- <a name="Options-105"></a>
- <h4 class="subsection">26.12.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-105" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-105" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">speed</samp></dt>
- <dd><p>Set drive reading speed. Default value is 0.
- </p>
- <p>The speed is specified CD-ROM speed units. The speed is set through
- the libcdio <code class="code">cdio_cddap_speed_set</code> function. On many CD-ROM
- drives, specifying a value too large will result in using the fastest
- speed.
- </p>
- </dd>
- <dt><samp class="option">paranoia_mode</samp></dt>
- <dd><p>Set paranoia recovery mode flags. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">disable</samp>’</dt>
- <dt>‘<samp class="samp">verify</samp>’</dt>
- <dt>‘<samp class="samp">overlap</samp>’</dt>
- <dt>‘<samp class="samp">neverskip</samp>’</dt>
- <dt>‘<samp class="samp">full</samp>’</dt>
- </dl>
- <p>Default value is ‘<samp class="samp">disable</samp>’.
- </p>
- <p>For more information about the available recovery modes, consult the
- paranoia project documentation.
- </p></dd>
- </dl>
- <a name="libdc1394"></a>
- <h3 class="section">26.13 libdc1394<span class="pull-right"><a class="anchor hidden-xs" href="#libdc1394" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libdc1394" aria-hidden="true">TOC</a></span></h3>
- <p>IIDC1394 input device, based on libdc1394 and libraw1394.
- </p>
- <p>Requires the configure option <code class="code">--enable-libdc1394</code>.
- </p>
- <a name="Options-106"></a>
- <h4 class="subsection">26.13.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-106" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-106" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the frame rate. Default is <code class="code">ntsc</code>, corresponding to a frame
- rate of <code class="code">30000/1001</code>.
- </p>
- </dd>
- <dt><samp class="option">pixel_format</samp></dt>
- <dd><p>Select the pixel format. Default is <code class="code">uyvy422</code>.
- </p>
- </dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video size given as a string such as <code class="code">640x480</code> or <code class="code">hd720</code>.
- Default is <code class="code">qvga</code>.
- </p></dd>
- </dl>
- <a name="openal"></a>
- <h3 class="section">26.14 openal<span class="pull-right"><a class="anchor hidden-xs" href="#openal" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-openal" aria-hidden="true">TOC</a></span></h3>
- <p>The OpenAL input device provides audio capture on all systems with a
- working OpenAL 1.1 implementation.
- </p>
- <p>To enable this input device during configuration, you need OpenAL
- headers and libraries installed on your system, and need to configure
- FFmpeg with <code class="code">--enable-openal</code>.
- </p>
- <p>OpenAL headers and libraries should be provided as part of your OpenAL
- implementation, or as an additional download (an SDK). Depending on your
- installation you may need to specify additional flags via the
- <code class="code">--extra-cflags</code> and <code class="code">--extra-ldflags</code> for allowing the build
- system to locate the OpenAL headers and libraries.
- </p>
- <p>An incomplete list of OpenAL implementations follows:
- </p>
- <dl class="table">
- <dt><strong class="strong">Creative</strong></dt>
- <dd><p>The official Windows implementation, providing hardware acceleration
- with supported devices and software fallback.
- See <a class="url" href="http://openal.org/">http://openal.org/</a>.
- </p></dd>
- <dt><strong class="strong">OpenAL Soft</strong></dt>
- <dd><p>Portable, open source (LGPL) software implementation. Includes
- backends for the most common sound APIs on the Windows, Linux,
- Solaris, and BSD operating systems.
- See <a class="url" href="http://kcat.strangesoft.net/openal.html">http://kcat.strangesoft.net/openal.html</a>.
- </p></dd>
- <dt><strong class="strong">Apple</strong></dt>
- <dd><p>OpenAL is part of Core Audio, the official Mac OS X Audio interface.
- See <a class="url" href="http://developer.apple.com/technologies/mac/audio-and-video.html">http://developer.apple.com/technologies/mac/audio-and-video.html</a>
- </p></dd>
- </dl>
- <p>This device allows one to capture from an audio input device handled
- through OpenAL.
- </p>
- <p>You need to specify the name of the device to capture in the provided
- filename. If the empty string is provided, the device will
- automatically select the default device. You can get the list of the
- supported devices by using the option <var class="var">list_devices</var>.
- </p>
- <a name="Options-107"></a>
- <h4 class="subsection">26.14.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-107" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-107" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of channels in the captured audio. Only the values
- <samp class="option">1</samp> (monaural) and <samp class="option">2</samp> (stereo) are currently supported.
- Defaults to <samp class="option">2</samp>.
- </p>
- </dd>
- <dt><samp class="option">sample_size</samp></dt>
- <dd><p>Set the sample size (in bits) of the captured audio. Only the values
- <samp class="option">8</samp> and <samp class="option">16</samp> are currently supported. Defaults to
- <samp class="option">16</samp>.
- </p>
- </dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sample rate (in Hz) of the captured audio.
- Defaults to <samp class="option">44.1k</samp>.
- </p>
- </dd>
- <dt><samp class="option">list_devices</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of devices and exit.
- Defaults to <samp class="option">false</samp>.
- </p>
- </dd>
- </dl>
- <a name="Examples-36"></a>
- <h4 class="subsection">26.14.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-36" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-36" aria-hidden="true">TOC</a></span></h4>
- <p>Print the list of OpenAL supported devices and exit:
- </p><div class="example">
- <pre class="example-preformatted">$ ffmpeg -list_devices true -f openal -i dummy out.ogg
- </pre></div>
- <p>Capture from the OpenAL device <samp class="file">DR-BT101 via PulseAudio</samp>:
- </p><div class="example">
- <pre class="example-preformatted">$ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg
- </pre></div>
- <p>Capture from the default device (note the empty string ” as filename):
- </p><div class="example">
- <pre class="example-preformatted">$ ffmpeg -f openal -i '' out.ogg
- </pre></div>
- <p>Capture from two devices simultaneously, writing to two different files,
- within the same <code class="command">ffmpeg</code> command:
- </p><div class="example">
- <pre class="example-preformatted">$ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg
- </pre></div>
- <p>Note: not all OpenAL implementations support multiple simultaneous capture -
- try the latest OpenAL Soft if the above does not work.
- </p>
- <a name="oss"></a>
- <h3 class="section">26.15 oss<span class="pull-right"><a class="anchor hidden-xs" href="#oss" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-oss" aria-hidden="true">TOC</a></span></h3>
- <p>Open Sound System input device.
- </p>
- <p>The filename to provide to the input device is the device node
- representing the OSS input device, and is usually set to
- <samp class="file">/dev/dsp</samp>.
- </p>
- <p>For example to grab from <samp class="file">/dev/dsp</samp> using <code class="command">ffmpeg</code> use the
- command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
- </pre></div>
- <p>For more information about OSS see:
- <a class="url" href="http://manuals.opensound.com/usersguide/dsp.html">http://manuals.opensound.com/usersguide/dsp.html</a>
- </p>
- <a name="Options-108"></a>
- <h4 class="subsection">26.15.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-108" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-108" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sample rate in Hz. Default is 48000.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of channels. Default is 2.
- </p>
- </dd>
- </dl>
- <a name="pulse"></a>
- <h3 class="section">26.16 pulse<span class="pull-right"><a class="anchor hidden-xs" href="#pulse" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pulse" aria-hidden="true">TOC</a></span></h3>
- <p>PulseAudio input device.
- </p>
- <p>To enable this output device you need to configure FFmpeg with <code class="code">--enable-libpulse</code>.
- </p>
- <p>The filename to provide to the input device is a source device or the
- string "default"
- </p>
- <p>To list the PulseAudio source devices and their properties you can invoke
- the command <code class="command">pactl list sources</code>.
- </p>
- <p>More information about PulseAudio can be found on <a class="url" href="http://www.pulseaudio.org">http://www.pulseaudio.org</a>.
- </p>
- <a name="Options-109"></a>
- <h4 class="subsection">26.16.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-109" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-109" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">server</samp></dt>
- <dd><p>Connect to a specific PulseAudio server, specified by an IP address.
- Default server is used when not provided.
- </p>
- </dd>
- <dt><samp class="option">name</samp></dt>
- <dd><p>Specify the application name PulseAudio will use when showing active clients,
- by default it is the <code class="code">LIBAVFORMAT_IDENT</code> string.
- </p>
- </dd>
- <dt><samp class="option">stream_name</samp></dt>
- <dd><p>Specify the stream name PulseAudio will use when showing active streams,
- by default it is "record".
- </p>
- </dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Specify the samplerate in Hz, by default 48kHz is used.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Specify the channels in use, by default 2 (stereo) is set.
- </p>
- </dd>
- <dt><samp class="option">frame_size</samp></dt>
- <dd><p>This option does nothing and is deprecated.
- </p>
- </dd>
- <dt><samp class="option">fragment_size</samp></dt>
- <dd><p>Specify the size in bytes of the minimal buffering fragment in PulseAudio, it
- will affect the audio latency. By default it is set to 50 ms amount of data.
- </p>
- </dd>
- <dt><samp class="option">wallclock</samp></dt>
- <dd><p>Set the initial PTS using the current time. Default is 1.
- </p>
- </dd>
- </dl>
- <a name="Examples-37"></a>
- <h4 class="subsection">26.16.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-37" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-37" aria-hidden="true">TOC</a></span></h4>
- <p>Record a stream from default device:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f pulse -i default /tmp/pulse.wav
- </pre></div>
- <a name="sndio"></a>
- <h3 class="section">26.17 sndio<span class="pull-right"><a class="anchor hidden-xs" href="#sndio" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sndio" aria-hidden="true">TOC</a></span></h3>
- <p>sndio input device.
- </p>
- <p>To enable this input device during configuration you need libsndio
- installed on your system.
- </p>
- <p>The filename to provide to the input device is the device node
- representing the sndio input device, and is usually set to
- <samp class="file">/dev/audio0</samp>.
- </p>
- <p>For example to grab from <samp class="file">/dev/audio0</samp> using <code class="command">ffmpeg</code> use the
- command:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
- </pre></div>
- <a name="Options-110"></a>
- <h4 class="subsection">26.17.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-110" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-110" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Set the sample rate in Hz. Default is 48000.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the number of channels. Default is 2.
- </p>
- </dd>
- </dl>
- <a name="video4linux2_002c-v4l2"></a>
- <h3 class="section">26.18 video4linux2, v4l2<span class="pull-right"><a class="anchor hidden-xs" href="#video4linux2_002c-v4l2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-video4linux2_002c-v4l2" aria-hidden="true">TOC</a></span></h3>
- <p>Video4Linux2 input video device.
- </p>
- <p>"v4l2" can be used as alias for "video4linux2".
- </p>
- <p>If FFmpeg is built with v4l-utils support (by using the
- <code class="code">--enable-libv4l2</code> configure option), it is possible to use it with the
- <code class="code">-use_libv4l2</code> input device option.
- </p>
- <p>The name of the device to grab is a file device node, usually Linux
- systems tend to automatically create such nodes when the device
- (e.g. an USB webcam) is plugged into the system, and has a name of the
- kind <samp class="file">/dev/video<var class="var">N</var></samp>, where <var class="var">N</var> is a number associated to
- the device.
- </p>
- <p>Video4Linux2 devices usually support a limited set of
- <var class="var">width</var>x<var class="var">height</var> sizes and frame rates. You can check which are
- supported using <code class="command">-list_formats all</code> for Video4Linux2 devices.
- Some devices, like TV cards, support one or more standards. It is possible
- to list all the supported standards using <code class="command">-list_standards all</code>.
- </p>
- <p>The time base for the timestamps is 1 microsecond. Depending on the kernel
- version and configuration, the timestamps may be derived from the real time
- clock (origin at the Unix Epoch) or the monotonic clock (origin usually at
- boot time, unaffected by NTP or manual changes to the clock). The
- <samp class="option">-timestamps abs</samp> or <samp class="option">-ts abs</samp> option can be used to force
- conversion into the real time clock.
- </p>
- <p>Some usage examples of the video4linux2 device with <code class="command">ffmpeg</code>
- and <code class="command">ffplay</code>:
- </p><ul class="itemize mark-bullet">
- <li>List supported formats for a video4linux2 device:
- <div class="example">
- <pre class="example-preformatted">ffplay -f video4linux2 -list_formats all /dev/video0
- </pre></div>
- </li><li>Grab and show the input of a video4linux2 device:
- <div class="example">
- <pre class="example-preformatted">ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
- </pre></div>
- </li><li>Grab and record the input of a video4linux2 device, leave the
- frame rate and size as previously set:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
- </pre></div>
- </li></ul>
- <p>For more information about Video4Linux, check <a class="url" href="http://linuxtv.org/">http://linuxtv.org/</a>.
- </p>
- <a name="Options-111"></a>
- <h4 class="subsection">26.18.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-111" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-111" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">standard</samp></dt>
- <dd><p>Set the standard. Must be the name of a supported standard. To get a
- list of the supported standards, use the <samp class="option">list_standards</samp>
- option.
- </p>
- </dd>
- <dt><samp class="option">channel</samp></dt>
- <dd><p>Set the input channel number. Default to -1, which means using the
- previously selected channel.
- </p>
- </dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video frame size. The argument must be a string in the form
- <var class="var">WIDTH</var>x<var class="var">HEIGHT</var> or a valid size abbreviation.
- </p>
- </dd>
- <dt><samp class="option">pixel_format</samp></dt>
- <dd><p>Select the pixel format (only valid for raw video input).
- </p>
- </dd>
- <dt><samp class="option">input_format</samp></dt>
- <dd><p>Set the preferred pixel format (for raw video) or a codec name.
- This option allows one to select the input format, when several are
- available.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the preferred video frame rate.
- </p>
- </dd>
- <dt><samp class="option">list_formats</samp></dt>
- <dd><p>List available formats (supported pixel formats, codecs, and frame
- sizes) and exit.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>Show all available (compressed and non-compressed) formats.
- </p>
- </dd>
- <dt>‘<samp class="samp">raw</samp>’</dt>
- <dd><p>Show only raw video (non-compressed) formats.
- </p>
- </dd>
- <dt>‘<samp class="samp">compressed</samp>’</dt>
- <dd><p>Show only compressed formats.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">list_standards</samp></dt>
- <dd><p>List supported standards and exit.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>Show all supported standards.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">timestamps, ts</samp></dt>
- <dd><p>Set type of timestamps for grabbed frames.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">default</samp>’</dt>
- <dd><p>Use timestamps from the kernel.
- </p>
- </dd>
- <dt>‘<samp class="samp">abs</samp>’</dt>
- <dd><p>Use absolute timestamps (wall clock).
- </p>
- </dd>
- <dt>‘<samp class="samp">mono2abs</samp>’</dt>
- <dd><p>Force conversion from monotonic to absolute timestamps.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">default</code>.
- </p>
- </dd>
- <dt><samp class="option">use_libv4l2</samp></dt>
- <dd><p>Use libv4l2 (v4l-utils) conversion functions. Default is 0.
- </p>
- </dd>
- </dl>
- <a name="vfwcap"></a>
- <h3 class="section">26.19 vfwcap<span class="pull-right"><a class="anchor hidden-xs" href="#vfwcap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vfwcap" aria-hidden="true">TOC</a></span></h3>
- <p>VfW (Video for Windows) capture input device.
- </p>
- <p>The filename passed as input is the capture driver number, ranging from
- 0 to 9. You may use "list" as filename to print a list of drivers. Any
- other filename will be interpreted as device number 0.
- </p>
- <a name="Options-112"></a>
- <h4 class="subsection">26.19.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-112" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-112" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video frame size.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the grabbing frame rate. Default value is <code class="code">ntsc</code>,
- corresponding to a frame rate of <code class="code">30000/1001</code>.
- </p>
- </dd>
- </dl>
- <a name="x11grab"></a>
- <h3 class="section">26.20 x11grab<span class="pull-right"><a class="anchor hidden-xs" href="#x11grab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-x11grab" aria-hidden="true">TOC</a></span></h3>
- <p>X11 video input device.
- </p>
- <p>To enable this input device during configuration you need libxcb
- installed on your system. It will be automatically detected during
- configuration.
- </p>
- <p>This device allows one to capture a region of an X11 display.
- </p>
- <p>The filename passed as input has the syntax:
- </p><div class="example">
- <pre class="example-preformatted">[<var class="var">hostname</var>]:<var class="var">display_number</var>.<var class="var">screen_number</var>[+<var class="var">x_offset</var>,<var class="var">y_offset</var>]
- </pre></div>
- <p><var class="var">hostname</var>:<var class="var">display_number</var>.<var class="var">screen_number</var> specifies the
- X11 display name of the screen to grab from. <var class="var">hostname</var> can be
- omitted, and defaults to "localhost". The environment variable
- <code class="env">DISPLAY</code> contains the default display name.
- </p>
- <p><var class="var">x_offset</var> and <var class="var">y_offset</var> specify the offsets of the grabbed
- area with respect to the top-left border of the X11 screen. They
- default to 0.
- </p>
- <p>Check the X11 documentation (e.g. <code class="command">man X</code>) for more detailed
- information.
- </p>
- <p>Use the <code class="command">xdpyinfo</code> program for getting basic information about
- the properties of your X11 display (e.g. grep for "name" or
- "dimensions").
- </p>
- <p>For example to grab from <samp class="file">:0.0</samp> using <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg
- </pre></div>
- <p>Grab at position <code class="code">10,20</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
- </pre></div>
- <a name="Options-113"></a>
- <h4 class="subsection">26.20.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-113" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-113" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">select_region</samp></dt>
- <dd><p>Specify whether to select the grabbing area graphically using the pointer.
- A value of <code class="code">1</code> prompts the user to select the grabbing area graphically
- by clicking and dragging. A single click with no dragging will select the
- whole screen. A region with zero width or height will also select the whole
- screen. This option overwrites the <var class="var">video_size</var>, <var class="var">grab_x</var>, and
- <var class="var">grab_y</var> options. Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">draw_mouse</samp></dt>
- <dd><p>Specify whether to draw the mouse pointer. A value of <code class="code">0</code> specifies
- not to draw the pointer. Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">follow_mouse</samp></dt>
- <dd><p>Make the grabbed area follow the mouse. The argument can be
- <code class="code">centered</code> or a number of pixels <var class="var">PIXELS</var>.
- </p>
- <p>When it is specified with "centered", the grabbing region follows the mouse
- pointer and keeps the pointer at the center of region; otherwise, the region
- follows only when the mouse pointer reaches within <var class="var">PIXELS</var> (greater than
- zero) to the edge of region.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg
- </pre></div>
- <p>To follow only when the mouse pointer reaches within 100 pixels to edge:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i :0.0 out.mpg
- </pre></div>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Set the grabbing frame rate. Default value is <code class="code">ntsc</code>,
- corresponding to a frame rate of <code class="code">30000/1001</code>.
- </p>
- </dd>
- <dt><samp class="option">show_region</samp></dt>
- <dd><p>Show grabbed region on screen.
- </p>
- <p>If <var class="var">show_region</var> is specified with <code class="code">1</code>, then the grabbing
- region will be indicated on screen. With this option, it is easy to
- know what is being grabbed if only a portion of the screen is grabbed.
- </p>
- </dd>
- <dt><samp class="option">region_border</samp></dt>
- <dd><p>Set the region border thickness if <samp class="option">-show_region 1</samp> is used.
- Range is 1 to 128 and default is 3 (XCB-based x11grab only).
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
- </pre></div>
- <p>With <var class="var">follow_mouse</var>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
- </pre></div>
- </dd>
- <dt><samp class="option">window_id</samp></dt>
- <dd><p>Grab this window, instead of the whole screen. Default value is 0, which maps to
- the whole screen (root window).
- </p>
- <p>The id of a window can be found using the <code class="command">xwininfo</code> program, possibly with options -tree and
- -root.
- </p>
- <p>If the window is later enlarged, the new area is not recorded. Video ends when
- the window is closed, unmapped (i.e., iconified) or shrunk beyond the video
- size (which defaults to the initial window size).
- </p>
- <p>This option disables options <samp class="option">follow_mouse</samp> and <samp class="option">select_region</samp>.
- </p>
- </dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Set the video frame size. Default is the full desktop or window.
- </p>
- </dd>
- <dt><samp class="option">grab_x</samp></dt>
- <dt><samp class="option">grab_y</samp></dt>
- <dd><p>Set the grabbing region coordinates. They are expressed as offset from
- the top left corner of the X11 window and correspond to the
- <var class="var">x_offset</var> and <var class="var">y_offset</var> parameters in the device name. The
- default value for both options is 0.
- </p></dd>
- </dl>
- <a name="Output-Devices"></a>
- <h2 class="chapter">27 Output Devices<span class="pull-right"><a class="anchor hidden-xs" href="#Output-Devices" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Output-Devices" aria-hidden="true">TOC</a></span></h2>
- <p>Output devices are configured elements in FFmpeg that can write
- multimedia data to an output device attached to your system.
- </p>
- <p>When you configure your FFmpeg build, all the supported output devices
- are enabled by default. You can list all available ones using the
- configure option "–list-outdevs".
- </p>
- <p>You can disable all the output devices using the configure option
- "–disable-outdevs", and selectively enable an output device using the
- option "–enable-outdev=<var class="var">OUTDEV</var>", or you can disable a particular
- input device using the option "–disable-outdev=<var class="var">OUTDEV</var>".
- </p>
- <p>The option "-devices" of the ff* tools will display the list of
- enabled output devices.
- </p>
- <p>A description of the currently available output devices follows.
- </p>
- <a name="alsa-1"></a>
- <h3 class="section">27.1 alsa<span class="pull-right"><a class="anchor hidden-xs" href="#alsa-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alsa-1" aria-hidden="true">TOC</a></span></h3>
- <p>ALSA (Advanced Linux Sound Architecture) output device.
- </p>
- <a name="Examples-38"></a>
- <h4 class="subsection">27.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-38" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-38" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Play a file on default ALSA device:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f alsa default
- </pre></div>
- </li><li>Play a file on soundcard 1, audio device 7:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f alsa hw:1,7
- </pre></div>
- </li></ul>
- <a name="AudioToolbox"></a>
- <h3 class="section">27.2 AudioToolbox<span class="pull-right"><a class="anchor hidden-xs" href="#AudioToolbox" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AudioToolbox" aria-hidden="true">TOC</a></span></h3>
- <p>AudioToolbox output device.
- </p>
- <p>Allows native output to CoreAudio devices on OSX.
- </p>
- <p>The output filename can be empty (or <code class="code">-</code>) to refer to the default system output device or a number that refers to the device index as shown using: <code class="code">-list_devices true</code>.
- </p>
- <p>Alternatively, the audio input device can be chosen by index using the
- <samp class="option">
- -audio_device_index <INDEX>
- </samp>
- , overriding any device name or index given in the input filename.
- </p>
- <p>All available devices can be enumerated by using <samp class="option">-list_devices true</samp>, listing
- all device names, UIDs and corresponding indices.
- </p>
- <a name="Options-114"></a>
- <h4 class="subsection">27.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-114" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-114" aria-hidden="true">TOC</a></span></h4>
- <p>AudioToolbox supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">-audio_device_index <INDEX></samp></dt>
- <dd><p>Specify the audio device by its index. Overrides anything given in the output filename.
- </p>
- </dd>
- </dl>
- <a name="Examples-39"></a>
- <h4 class="subsection">27.2.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-39" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-39" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Print the list of supported devices and output a sine wave to the default device:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -list_devices true -
- </pre></div>
- </li><li>Output a sine wave to the device with the index 2, overriding any output filename:
- <div class="example">
- <pre class="example-preformatted">$ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -audio_device_index 2 -
- </pre></div>
- </li></ul>
- <a name="caca"></a>
- <h3 class="section">27.3 caca<span class="pull-right"><a class="anchor hidden-xs" href="#caca" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-caca" aria-hidden="true">TOC</a></span></h3>
- <p>CACA output device.
- </p>
- <p>This output device allows one to show a video stream in CACA window.
- Only one CACA window is allowed per application, so you can
- have only one instance of this output device in an application.
- </p>
- <p>To enable this output device you need to configure FFmpeg with
- <code class="code">--enable-libcaca</code>.
- libcaca is a graphics library that outputs text instead of pixels.
- </p>
- <p>For more information about libcaca, check:
- <a class="url" href="http://caca.zoy.org/wiki/libcaca">http://caca.zoy.org/wiki/libcaca</a>
- </p>
- <a name="Options-115"></a>
- <h4 class="subsection">27.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-115" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-115" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">window_title</samp></dt>
- <dd><p>Set the CACA window title, if not specified default to the filename
- specified for the output device.
- </p>
- </dd>
- <dt><samp class="option">window_size</samp></dt>
- <dd><p>Set the CACA window size, can be a string of the form
- <var class="var">width</var>x<var class="var">height</var> or a video size abbreviation.
- If not specified it defaults to the size of the input video.
- </p>
- </dd>
- <dt><samp class="option">driver</samp></dt>
- <dd><p>Set display driver.
- </p>
- </dd>
- <dt><samp class="option">algorithm</samp></dt>
- <dd><p>Set dithering algorithm. Dithering is necessary
- because the picture being rendered has usually far more colours than
- the available palette.
- The accepted values are listed with <code class="code">-list_dither algorithms</code>.
- </p>
- </dd>
- <dt><samp class="option">antialias</samp></dt>
- <dd><p>Set antialias method. Antialiasing smoothens the rendered
- image and avoids the commonly seen staircase effect.
- The accepted values are listed with <code class="code">-list_dither antialiases</code>.
- </p>
- </dd>
- <dt><samp class="option">charset</samp></dt>
- <dd><p>Set which characters are going to be used when rendering text.
- The accepted values are listed with <code class="code">-list_dither charsets</code>.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Set color to be used when rendering text.
- The accepted values are listed with <code class="code">-list_dither colors</code>.
- </p>
- </dd>
- <dt><samp class="option">list_drivers</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of available drivers and exit.
- </p>
- </dd>
- <dt><samp class="option">list_dither</samp></dt>
- <dd><p>List available dither options related to the argument.
- The argument must be one of <code class="code">algorithms</code>, <code class="code">antialiases</code>,
- <code class="code">charsets</code>, <code class="code">colors</code>.
- </p></dd>
- </dl>
- <a name="Examples-40"></a>
- <h4 class="subsection">27.3.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-40" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-40" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>The following command shows the <code class="command">ffmpeg</code> output is an
- CACA window, forcing its size to 80x25:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -c:v rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
- </pre></div>
- </li><li>Show the list of available drivers and exit:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
- </pre></div>
- </li><li>Show the list of available dither colors and exit:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
- </pre></div>
- </li></ul>
- <a name="decklink-1"></a>
- <h3 class="section">27.4 decklink<span class="pull-right"><a class="anchor hidden-xs" href="#decklink-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-decklink-1" aria-hidden="true">TOC</a></span></h3>
- <p>The decklink output device provides playback capabilities for Blackmagic
- DeckLink devices.
- </p>
- <p>To enable this output device, you need the Blackmagic DeckLink SDK and you
- need to configure with the appropriate <code class="code">--extra-cflags</code>
- and <code class="code">--extra-ldflags</code>.
- On Windows, you need to run the IDL files through <code class="command">widl</code>.
- </p>
- <p>DeckLink is very picky about the formats it supports. Pixel format is always
- uyvy422, framerate, field order and video size must be determined for your
- device with <code class="command">-list_formats 1</code>. Audio sample rate is always 48 kHz.
- </p>
- <a name="Options-116"></a>
- <h4 class="subsection">27.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-116" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-116" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">list_devices</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of devices and exit.
- Defaults to <samp class="option">false</samp>. This option is deprecated, please use the
- <code class="code">-sinks</code> option of ffmpeg to list the available output devices.
- </p>
- </dd>
- <dt><samp class="option">list_formats</samp></dt>
- <dd><p>If set to <samp class="option">true</samp>, print a list of supported formats and exit.
- Defaults to <samp class="option">false</samp>.
- </p>
- </dd>
- <dt><samp class="option">preroll</samp></dt>
- <dd><p>Amount of time to preroll video in seconds.
- Defaults to <samp class="option">0.5</samp>.
- </p>
- </dd>
- <dt><samp class="option">duplex_mode</samp></dt>
- <dd><p>Sets the decklink device duplex/profile mode. Must be ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">half</samp>’, ‘<samp class="samp">full</samp>’,
- ‘<samp class="samp">one_sub_device_full</samp>’, ‘<samp class="samp">one_sub_device_half</samp>’, ‘<samp class="samp">two_sub_device_full</samp>’,
- ‘<samp class="samp">four_sub_device_half</samp>’
- Defaults to ‘<samp class="samp">unset</samp>’.
- </p>
- <p>Note: DeckLink SDK 11.0 have replaced the duplex property by a profile property.
- For the DeckLink Duo 2 and DeckLink Quad 2, a profile is shared between any 2
- sub-devices that utilize the same connectors. For the DeckLink 8K Pro, a profile
- is shared between all 4 sub-devices. So DeckLink 8K Pro support four profiles.
- </p>
- <p>Valid profile modes for DeckLink 8K Pro(with DeckLink SDK >= 11.0):
- ‘<samp class="samp">one_sub_device_full</samp>’, ‘<samp class="samp">one_sub_device_half</samp>’, ‘<samp class="samp">two_sub_device_full</samp>’,
- ‘<samp class="samp">four_sub_device_half</samp>’
- </p>
- <p>Valid profile modes for DeckLink Quad 2 and DeckLink Duo 2:
- ‘<samp class="samp">half</samp>’, ‘<samp class="samp">full</samp>’
- </p>
- </dd>
- <dt><samp class="option">timing_offset</samp></dt>
- <dd><p>Sets the genlock timing pixel offset on the used output.
- Defaults to ‘<samp class="samp">unset</samp>’.
- </p>
- </dd>
- <dt><samp class="option">link</samp></dt>
- <dd><p>Sets the SDI video link configuration on the used output. Must be
- ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">single</samp>’ link SDI, ‘<samp class="samp">dual</samp>’ link SDI or ‘<samp class="samp">quad</samp>’ link
- SDI.
- Defaults to ‘<samp class="samp">unset</samp>’.
- </p>
- </dd>
- <dt><samp class="option">sqd</samp></dt>
- <dd><p>Enable Square Division Quad Split mode for Quad-link SDI output.
- Must be ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">true</samp>’ or ‘<samp class="samp">false</samp>’.
- Defaults to <samp class="option">unset</samp>.
- </p>
- </dd>
- <dt><samp class="option">level_a</samp></dt>
- <dd><p>Enable SMPTE Level A mode on the used output.
- Must be ‘<samp class="samp">unset</samp>’, ‘<samp class="samp">true</samp>’ or ‘<samp class="samp">false</samp>’.
- Defaults to <samp class="option">unset</samp>.
- </p>
- </dd>
- <dt><samp class="option">vanc_queue_size</samp></dt>
- <dd><p>Sets maximum output buffer size in bytes for VANC data. If the buffering reaches this value,
- outgoing VANC data will be dropped.
- Defaults to ‘<samp class="samp">1048576</samp>’.
- </p>
- </dd>
- </dl>
- <a name="Examples-41"></a>
- <h4 class="subsection">27.4.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-41" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-41" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>List output devices:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -sinks decklink
- </pre></div>
- </li><li>List supported formats:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i test.avi -f decklink -list_formats 1 'DeckLink Mini Monitor'
- </pre></div>
- </li><li>Play video clip:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'
- </pre></div>
- </li><li>Play video clip with non-standard framerate or video size:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'
- </pre></div>
- </li></ul>
- <a name="fbdev-1"></a>
- <h3 class="section">27.5 fbdev<span class="pull-right"><a class="anchor hidden-xs" href="#fbdev-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fbdev-1" aria-hidden="true">TOC</a></span></h3>
- <p>Linux framebuffer output device.
- </p>
- <p>The Linux framebuffer is a graphic hardware-independent abstraction
- layer to show graphics on a computer monitor, typically on the
- console. It is accessed through a file device node, usually
- <samp class="file">/dev/fb0</samp>.
- </p>
- <p>For more detailed information read the file
- <samp class="file">Documentation/fb/framebuffer.txt</samp> included in the Linux source tree.
- </p>
- <a name="Options-117"></a>
- <h4 class="subsection">27.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-117" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-117" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">xoffset</samp></dt>
- <dt><samp class="option">yoffset</samp></dt>
- <dd><p>Set x/y coordinate of top left corner. Default is 0.
- </p></dd>
- </dl>
- <a name="Examples-42"></a>
- <h4 class="subsection">27.5.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-42" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-42" aria-hidden="true">TOC</a></span></h4>
- <p>Play a file on framebuffer device <samp class="file">/dev/fb0</samp>.
- Required pixel format depends on current framebuffer settings.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -re -i INPUT -c:v rawvideo -pix_fmt bgra -f fbdev /dev/fb0
- </pre></div>
- <p>See also <a class="url" href="http://linux-fbdev.sourceforge.net/">http://linux-fbdev.sourceforge.net/</a>, and fbset(1).
- </p>
- <a name="oss-1"></a>
- <h3 class="section">27.6 oss<span class="pull-right"><a class="anchor hidden-xs" href="#oss-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-oss-1" aria-hidden="true">TOC</a></span></h3>
- <p>OSS (Open Sound System) output device.
- </p>
- <a name="pulse-1"></a>
- <h3 class="section">27.7 pulse<span class="pull-right"><a class="anchor hidden-xs" href="#pulse-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pulse-1" aria-hidden="true">TOC</a></span></h3>
- <p>PulseAudio output device.
- </p>
- <p>To enable this output device you need to configure FFmpeg with <code class="code">--enable-libpulse</code>.
- </p>
- <p>More information about PulseAudio can be found on <a class="url" href="http://www.pulseaudio.org">http://www.pulseaudio.org</a>
- </p>
- <a name="Options-118"></a>
- <h4 class="subsection">27.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-118" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-118" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">server</samp></dt>
- <dd><p>Connect to a specific PulseAudio server, specified by an IP address.
- Default server is used when not provided.
- </p>
- </dd>
- <dt><samp class="option">name</samp></dt>
- <dd><p>Specify the application name PulseAudio will use when showing active clients,
- by default it is the <code class="code">LIBAVFORMAT_IDENT</code> string.
- </p>
- </dd>
- <dt><samp class="option">stream_name</samp></dt>
- <dd><p>Specify the stream name PulseAudio will use when showing active streams,
- by default it is set to the specified output name.
- </p>
- </dd>
- <dt><samp class="option">device</samp></dt>
- <dd><p>Specify the device to use. Default device is used when not provided.
- List of output devices can be obtained with command <code class="command">pactl list sinks</code>.
- </p>
- </dd>
- <dt><samp class="option">buffer_size</samp></dt>
- <dt><samp class="option">buffer_duration</samp></dt>
- <dd><p>Control the size and duration of the PulseAudio buffer. A small buffer
- gives more control, but requires more frequent updates.
- </p>
- <p><samp class="option">buffer_size</samp> specifies size in bytes while
- <samp class="option">buffer_duration</samp> specifies duration in milliseconds.
- </p>
- <p>When both options are provided then the highest value is used
- (duration is recalculated to bytes using stream parameters). If they
- are set to 0 (which is default), the device will use the default
- PulseAudio duration value. By default PulseAudio set buffer duration
- to around 2 seconds.
- </p>
- </dd>
- <dt><samp class="option">prebuf</samp></dt>
- <dd><p>Specify pre-buffering size in bytes. The server does not start with
- playback before at least <samp class="option">prebuf</samp> bytes are available in the
- buffer. By default this option is initialized to the same value as
- <samp class="option">buffer_size</samp> or <samp class="option">buffer_duration</samp> (whichever is bigger).
- </p>
- </dd>
- <dt><samp class="option">minreq</samp></dt>
- <dd><p>Specify minimum request size in bytes. The server does not request less
- than <samp class="option">minreq</samp> bytes from the client, instead waits until the buffer
- is free enough to request more bytes at once. It is recommended to not set
- this option, which will initialize this to a value that is deemed sensible
- by the server.
- </p>
- </dd>
- </dl>
- <a name="Examples-43"></a>
- <h4 class="subsection">27.7.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-43" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-43" aria-hidden="true">TOC</a></span></h4>
- <p>Play a file on default device on default server:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f pulse "stream name"
- </pre></div>
- <a name="sndio-1"></a>
- <h3 class="section">27.8 sndio<span class="pull-right"><a class="anchor hidden-xs" href="#sndio-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sndio-1" aria-hidden="true">TOC</a></span></h3>
- <p>sndio audio output device.
- </p>
- <a name="v4l2"></a>
- <h3 class="section">27.9 v4l2<span class="pull-right"><a class="anchor hidden-xs" href="#v4l2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-v4l2" aria-hidden="true">TOC</a></span></h3>
- <p>Video4Linux2 output device.
- </p>
- <a name="xv"></a>
- <h3 class="section">27.10 xv<span class="pull-right"><a class="anchor hidden-xs" href="#xv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xv" aria-hidden="true">TOC</a></span></h3>
- <p>XV (XVideo) output device.
- </p>
- <p>This output device allows one to show a video stream in a X Window System
- window.
- </p>
- <a name="Options-119"></a>
- <h4 class="subsection">27.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-119" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-119" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">display_name</samp></dt>
- <dd><p>Specify the hardware display name, which determines the display and
- communications domain to be used.
- </p>
- <p>The display name or DISPLAY environment variable can be a string in
- the format <var class="var">hostname</var>[:<var class="var">number</var>[.<var class="var">screen_number</var>]].
- </p>
- <p><var class="var">hostname</var> specifies the name of the host machine on which the
- display is physically attached. <var class="var">number</var> specifies the number of
- the display server on that host machine. <var class="var">screen_number</var> specifies
- the screen to be used on that server.
- </p>
- <p>If unspecified, it defaults to the value of the DISPLAY environment
- variable.
- </p>
- <p>For example, <code class="code">dual-headed:0.1</code> would specify screen 1 of display
- 0 on the machine named “dual-headed”.
- </p>
- <p>Check the X11 specification for more detailed information about the
- display name format.
- </p>
- </dd>
- <dt><samp class="option">window_id</samp></dt>
- <dd><p>When set to non-zero value then device doesn’t create new window,
- but uses existing one with provided <var class="var">window_id</var>. By default
- this options is set to zero and device creates its own window.
- </p>
- </dd>
- <dt><samp class="option">window_size</samp></dt>
- <dd><p>Set the created window size, can be a string of the form
- <var class="var">width</var>x<var class="var">height</var> or a video size abbreviation. If not
- specified it defaults to the size of the input video.
- Ignored when <var class="var">window_id</var> is set.
- </p>
- </dd>
- <dt><samp class="option">window_x</samp></dt>
- <dt><samp class="option">window_y</samp></dt>
- <dd><p>Set the X and Y window offsets for the created window. They are both
- set to 0 by default. The values may be ignored by the window manager.
- Ignored when <var class="var">window_id</var> is set.
- </p>
- </dd>
- <dt><samp class="option">window_title</samp></dt>
- <dd><p>Set the window title, if not specified default to the filename
- specified for the output device. Ignored when <var class="var">window_id</var> is set.
- </p></dd>
- </dl>
- <p>For more information about XVideo see <a class="url" href="http://www.x.org/">http://www.x.org/</a>.
- </p>
- <a name="Examples-44"></a>
- <h4 class="subsection">27.10.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-44" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-44" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Decode, display and encode video input with <code class="command">ffmpeg</code> at the
- same time:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT OUTPUT -f xv display
- </pre></div>
- </li><li>Decode and display the input video to multiple X11 windows:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f xv normal -vf negate -f xv negated
- </pre></div>
- </li></ul>
- <a name="Resampler-Options"></a>
- <h2 class="chapter">28 Resampler Options<span class="pull-right"><a class="anchor hidden-xs" href="#Resampler-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Resampler-Options" aria-hidden="true">TOC</a></span></h2>
- <p>The audio resampler supports the following named options.
- </p>
- <p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
- FFmpeg tools, <var class="var">option</var>=<var class="var">value</var> for the aresample filter,
- by setting the value explicitly in the
- <code class="code">SwrContext</code> options or using the <samp class="file">libavutil/opt.h</samp> API for
- programmatic use.
- </p>
- <dl class="table">
- <dt><samp class="option">uchl, used_chlayout</samp></dt>
- <dd><p>Set used input channel layout. Default is unset. This option is
- only used for special remapping.
- </p>
- </dd>
- <dt><samp class="option">isr, in_sample_rate</samp></dt>
- <dd><p>Set the input sample rate. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">osr, out_sample_rate</samp></dt>
- <dd><p>Set the output sample rate. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">isf, in_sample_fmt</samp></dt>
- <dd><p>Specify the input sample format. It is set by default to <code class="code">none</code>.
- </p>
- </dd>
- <dt><samp class="option">osf, out_sample_fmt</samp></dt>
- <dd><p>Specify the output sample format. It is set by default to <code class="code">none</code>.
- </p>
- </dd>
- <dt><samp class="option">tsf, internal_sample_fmt</samp></dt>
- <dd><p>Set the internal sample format. Default value is <code class="code">none</code>.
- This will automatically be chosen when it is not explicitly set.
- </p>
- </dd>
- <dt><samp class="option">ichl, in_chlayout</samp></dt>
- <dt><samp class="option">ochl, out_chlayout</samp></dt>
- <dd><p>Set the input/output channel layout.
- </p>
- <p>See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#channel-layout-syntax">the Channel Layout section in the ffmpeg-utils(1) manual</a>
- for the required syntax.
- </p>
- </dd>
- <dt><samp class="option">clev, center_mix_level</samp></dt>
- <dd><p>Set the center mix level. It is a value expressed in deciBel, and must be
- in the interval [-32,32].
- </p>
- </dd>
- <dt><samp class="option">slev, surround_mix_level</samp></dt>
- <dd><p>Set the surround mix level. It is a value expressed in deciBel, and must
- be in the interval [-32,32].
- </p>
- </dd>
- <dt><samp class="option">lfe_mix_level</samp></dt>
- <dd><p>Set LFE mix into non LFE level. It is used when there is a LFE input but no
- LFE output. It is a value expressed in deciBel, and must
- be in the interval [-32,32].
- </p>
- </dd>
- <dt><samp class="option">rmvol, rematrix_volume</samp></dt>
- <dd><p>Set rematrix volume. Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">rematrix_maxval</samp></dt>
- <dd><p>Set maximum output value for rematrixing.
- This can be used to prevent clipping vs. preventing volume reduction.
- A value of 1.0 prevents clipping.
- </p>
- </dd>
- <dt><samp class="option">flags, swr_flags</samp></dt>
- <dd><p>Set flags used by the converter. Default value is 0.
- </p>
- <p>It supports the following individual flags:
- </p><dl class="table">
- <dt><samp class="option">res</samp></dt>
- <dd><p>force resampling, this flag forces resampling to be used even when the
- input and output sample rates match.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dither_scale</samp></dt>
- <dd><p>Set the dither scale. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">dither_method</samp></dt>
- <dd><p>Set dither method. Default value is 0.
- </p>
- <p>Supported values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rectangular</samp>’</dt>
- <dd><p>select rectangular dither
- </p></dd>
- <dt>‘<samp class="samp">triangular</samp>’</dt>
- <dd><p>select triangular dither
- </p></dd>
- <dt>‘<samp class="samp">triangular_hp</samp>’</dt>
- <dd><p>select triangular dither with high pass
- </p></dd>
- <dt>‘<samp class="samp">lipshitz</samp>’</dt>
- <dd><p>select Lipshitz noise shaping dither.
- </p></dd>
- <dt>‘<samp class="samp">shibata</samp>’</dt>
- <dd><p>select Shibata noise shaping dither.
- </p></dd>
- <dt>‘<samp class="samp">low_shibata</samp>’</dt>
- <dd><p>select low Shibata noise shaping dither.
- </p></dd>
- <dt>‘<samp class="samp">high_shibata</samp>’</dt>
- <dd><p>select high Shibata noise shaping dither.
- </p></dd>
- <dt>‘<samp class="samp">f_weighted</samp>’</dt>
- <dd><p>select f-weighted noise shaping dither
- </p></dd>
- <dt>‘<samp class="samp">modified_e_weighted</samp>’</dt>
- <dd><p>select modified-e-weighted noise shaping dither
- </p></dd>
- <dt>‘<samp class="samp">improved_e_weighted</samp>’</dt>
- <dd><p>select improved-e-weighted noise shaping dither
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">resampler</samp></dt>
- <dd><p>Set resampling engine. Default value is swr.
- </p>
- <p>Supported values:
- </p><dl class="table">
- <dt>‘<samp class="samp">swr</samp>’</dt>
- <dd><p>select the native SW Resampler; filter options precision and cheby are not
- applicable in this case.
- </p></dd>
- <dt>‘<samp class="samp">soxr</samp>’</dt>
- <dd><p>select the SoX Resampler (where available); compensation, and filter options
- filter_size, phase_shift, exact_rational, filter_type & kaiser_beta, are not
- applicable in this case.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">filter_size</samp></dt>
- <dd><p>For swr only, set resampling filter size, default value is 32.
- </p>
- </dd>
- <dt><samp class="option">phase_shift</samp></dt>
- <dd><p>For swr only, set resampling phase shift, default value is 10, and must be in
- the interval [0,30].
- </p>
- </dd>
- <dt><samp class="option">linear_interp</samp></dt>
- <dd><p>Use linear interpolation when enabled (the default). Disable it if you want
- to preserve speed instead of quality when exact_rational fails.
- </p>
- </dd>
- <dt><samp class="option">exact_rational</samp></dt>
- <dd><p>For swr only, when enabled, try to use exact phase_count based on input and
- output sample rate. However, if it is larger than <code class="code">1 << phase_shift</code>,
- the phase_count will be <code class="code">1 << phase_shift</code> as fallback. Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set cutoff frequency (swr: 6dB point; soxr: 0dB point) ratio; must be a float
- value between 0 and 1. Default value is 0.97 with swr, and 0.91 with soxr
- (which, with a sample-rate of 44100, preserves the entire audio band to 20kHz).
- </p>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>For soxr only, the precision in bits to which the resampled signal will be
- calculated. The default value of 20 (which, with suitable dithering, is
- appropriate for a destination bit-depth of 16) gives SoX’s ’High Quality’; a
- value of 28 gives SoX’s ’Very High Quality’.
- </p>
- </dd>
- <dt><samp class="option">cheby</samp></dt>
- <dd><p>For soxr only, selects passband rolloff none (Chebyshev) & higher-precision
- approximation for ’irrational’ ratios. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">async</samp></dt>
- <dd><p>For swr only, simple 1 parameter audio sync to timestamps using stretching,
- squeezing, filling and trimming. Setting this to 1 will enable filling and
- trimming, larger values represent the maximum amount in samples that the data
- may be stretched or squeezed for each second.
- Default value is 0, thus no compensation is applied to make the samples match
- the audio timestamps.
- </p>
- </dd>
- <dt><samp class="option">first_pts</samp></dt>
- <dd><p>For swr only, assume the first pts should be this value. The time unit is 1 / sample rate.
- This allows for padding/trimming at the start of stream. By default, no
- assumption is made about the first frame’s expected pts, so no padding or
- trimming is done. For example, this could be set to 0 to pad the beginning with
- silence if an audio stream starts after the video stream or to trim any samples
- with a negative pts due to encoder delay.
- </p>
- </dd>
- <dt><samp class="option">min_comp</samp></dt>
- <dd><p>For swr only, set the minimum difference between timestamps and audio data (in
- seconds) to trigger stretching/squeezing/filling or trimming of the
- data to make it match the timestamps. The default is that
- stretching/squeezing/filling and trimming is disabled
- (<samp class="option">min_comp</samp> = <code class="code">FLT_MAX</code>).
- </p>
- </dd>
- <dt><samp class="option">min_hard_comp</samp></dt>
- <dd><p>For swr only, set the minimum difference between timestamps and audio data (in
- seconds) to trigger adding/dropping samples to make it match the
- timestamps. This option effectively is a threshold to select between
- hard (trim/fill) and soft (squeeze/stretch) compensation. Note that
- all compensation is by default disabled through <samp class="option">min_comp</samp>.
- The default is 0.1.
- </p>
- </dd>
- <dt><samp class="option">comp_duration</samp></dt>
- <dd><p>For swr only, set duration (in seconds) over which data is stretched/squeezed
- to make it match the timestamps. Must be a non-negative double float value,
- default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">max_soft_comp</samp></dt>
- <dd><p>For swr only, set maximum factor by which data is stretched/squeezed to make it
- match the timestamps. Must be a non-negative double float value, default value
- is 0.
- </p>
- </dd>
- <dt><samp class="option">matrix_encoding</samp></dt>
- <dd><p>Select matrixed stereo encoding.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>select none
- </p></dd>
- <dt>‘<samp class="samp">dolby</samp>’</dt>
- <dd><p>select Dolby
- </p></dd>
- <dt>‘<samp class="samp">dplii</samp>’</dt>
- <dd><p>select Dolby Pro Logic II
- </p></dd>
- </dl>
- <p>Default value is <code class="code">none</code>.
- </p>
- </dd>
- <dt><samp class="option">filter_type</samp></dt>
- <dd><p>For swr only, select resampling filter type. This only affects resampling
- operations.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">cubic</samp>’</dt>
- <dd><p>select cubic
- </p></dd>
- <dt>‘<samp class="samp">blackman_nuttall</samp>’</dt>
- <dd><p>select Blackman Nuttall windowed sinc
- </p></dd>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- <dd><p>select Kaiser windowed sinc
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">kaiser_beta</samp></dt>
- <dd><p>For swr only, set Kaiser window beta value. Must be a double float value in the
- interval [2,16], default value is 9.
- </p>
- </dd>
- <dt><samp class="option">output_sample_bits</samp></dt>
- <dd><p>For swr only, set number of used output sample bits for dithering. Must be an integer in the
- interval [0,64], default value is 0, which means it’s not used.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="scaler_005foptions"></a><a name="Scaler-Options"></a>
- <h2 class="chapter">29 Scaler Options<span class="pull-right"><a class="anchor hidden-xs" href="#Scaler-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Scaler-Options" aria-hidden="true">TOC</a></span></h2>
- <p>The video scaler supports the following named options.
- </p>
- <p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
- FFmpeg tools, with a few API-only exceptions noted below.
- For programmatic use, they can be set explicitly in the
- <code class="code">SwsContext</code> options or through the <samp class="file">libavutil/opt.h</samp> API.
- </p>
- <dl class="table">
- <dd>
- <a class="anchor" id="sws_005fflags"></a></dd>
- <dt><samp class="option">sws_flags</samp></dt>
- <dd><p>Set the scaler flags. This is also used to set the scaling
- algorithm. Only a single algorithm should be selected. Default
- value is ‘<samp class="samp">bicubic</samp>’.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">fast_bilinear</samp>’</dt>
- <dd><p>Select fast bilinear scaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">bilinear</samp>’</dt>
- <dd><p>Select bilinear scaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">bicubic</samp>’</dt>
- <dd><p>Select bicubic scaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">experimental</samp>’</dt>
- <dd><p>Select experimental scaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">neighbor</samp>’</dt>
- <dd><p>Select nearest neighbor rescaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">area</samp>’</dt>
- <dd><p>Select averaging area rescaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">bicublin</samp>’</dt>
- <dd><p>Select bicubic scaling algorithm for the luma component, bilinear for
- chroma components.
- </p>
- </dd>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dd><p>Select Gaussian rescaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">sinc</samp>’</dt>
- <dd><p>Select sinc rescaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dd><p>Select Lanczos rescaling algorithm. The default width (alpha) is 3 and can be
- changed by setting <code class="code">param0</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">spline</samp>’</dt>
- <dd><p>Select natural bicubic spline rescaling algorithm.
- </p>
- </dd>
- <dt>‘<samp class="samp">print_info</samp>’</dt>
- <dd><p>Enable printing/debug logging.
- </p>
- </dd>
- <dt>‘<samp class="samp">accurate_rnd</samp>’</dt>
- <dd><p>Enable accurate rounding.
- </p>
- </dd>
- <dt>‘<samp class="samp">full_chroma_int</samp>’</dt>
- <dd><p>Enable full chroma interpolation.
- </p>
- </dd>
- <dt>‘<samp class="samp">full_chroma_inp</samp>’</dt>
- <dd><p>Select full chroma input.
- </p>
- </dd>
- <dt>‘<samp class="samp">bitexact</samp>’</dt>
- <dd><p>Enable bitexact output.
- </p>
- </dd>
- <dt>‘<samp class="samp">unstable</samp>’</dt>
- <dd><p>Allow the use of experimental new code. May subtly affect the output or even
- produce wrong results. For testing only.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">srcw <var class="var">(API only)</var></samp></dt>
- <dd><p>Set source width.
- </p>
- </dd>
- <dt><samp class="option">srch <var class="var">(API only)</var></samp></dt>
- <dd><p>Set source height.
- </p>
- </dd>
- <dt><samp class="option">dstw <var class="var">(API only)</var></samp></dt>
- <dd><p>Set destination width.
- </p>
- </dd>
- <dt><samp class="option">dsth <var class="var">(API only)</var></samp></dt>
- <dd><p>Set destination height.
- </p>
- </dd>
- <dt><samp class="option">src_format <var class="var">(API only)</var></samp></dt>
- <dd><p>Set source pixel format (must be expressed as an integer).
- </p>
- </dd>
- <dt><samp class="option">dst_format <var class="var">(API only)</var></samp></dt>
- <dd><p>Set destination pixel format (must be expressed as an integer).
- </p>
- </dd>
- <dt><samp class="option">src_range <var class="var">(boolean)</var></samp></dt>
- <dd><p>If value is set to <code class="code">1</code>, indicates source is full range. Default value is
- <code class="code">0</code>, which indicates source is limited range.
- </p>
- </dd>
- <dt><samp class="option">dst_range <var class="var">(boolean)</var></samp></dt>
- <dd><p>If value is set to <code class="code">1</code>, enable full range for destination. Default value
- is <code class="code">0</code>, which enables limited range.
- </p>
- </dd>
- <dt><samp class="option">gamma <var class="var">(boolean)</var></samp></dt>
- <dd><p>If value is set to <code class="code">1</code>, enable gamma correct scaling. Default value is <code class="code">0</code>.
- </p>
- <a class="anchor" id="sws_005fparams"></a></dd>
- <dt><samp class="option">param0, param1</samp></dt>
- <dd><p>Set scaling algorithm parameters. The specified values are specific of
- some scaling algorithms and ignored by others. The specified values
- are floating point number values.
- </p>
- </dd>
- <dt><samp class="option">sws_dither</samp></dt>
- <dd><p>Set the dithering algorithm. Accepts one of the following
- values. Default value is ‘<samp class="samp">auto</samp>’.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>automatic choice
- </p>
- </dd>
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>no dithering
- </p>
- </dd>
- <dt>‘<samp class="samp">bayer</samp>’</dt>
- <dd><p>bayer dither
- </p>
- </dd>
- <dt>‘<samp class="samp">ed</samp>’</dt>
- <dd><p>error diffusion dither
- </p>
- </dd>
- <dt>‘<samp class="samp">a_dither</samp>’</dt>
- <dd><p>arithmetic dither, based using addition
- </p>
- </dd>
- <dt>‘<samp class="samp">x_dither</samp>’</dt>
- <dd><p>arithmetic dither, based using xor (more random/less apparent patterning that
- a_dither).
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">alphablend</samp></dt>
- <dd><p>Set the alpha blending to use when the input has alpha but the output does not.
- Default value is ‘<samp class="samp">none</samp>’.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">uniform_color</samp>’</dt>
- <dd><p>Blend onto a uniform background color
- </p>
- </dd>
- <dt>‘<samp class="samp">checkerboard</samp>’</dt>
- <dd><p>Blend onto a checkerboard
- </p>
- </dd>
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No blending
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="Filtering-Introduction"></a>
- <h2 class="chapter">30 Filtering Introduction<span class="pull-right"><a class="anchor hidden-xs" href="#Filtering-Introduction" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Filtering-Introduction" aria-hidden="true">TOC</a></span></h2>
- <p>Filtering in FFmpeg is enabled through the libavfilter library.
- </p>
- <p>In libavfilter, a filter can have multiple inputs and multiple
- outputs.
- To illustrate the sorts of things that are possible, we consider the
- following filtergraph.
- </p>
- <pre class="verbatim"> [main]
- input --> split ---------------------> overlay --> output
- | ^
- |[tmp] [flip]|
- +-----> crop --> vflip -------+
- </pre>
- <p>This filtergraph splits the input stream in two streams, then sends one
- stream through the crop filter and the vflip filter, before merging it
- back with the other stream by overlaying it on top. You can use the
- following command to achieve this:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf "split [main][tmp]; [tmp] crop=iw:ih/2:0:0, vflip [flip]; [main][flip] overlay=0:H/2" OUTPUT
- </pre></div>
- <p>The result will be that the top half of the video is mirrored
- onto the bottom half of the output video.
- </p>
- <p>Filters in the same linear chain are separated by commas, and distinct
- linear chains of filters are separated by semicolons. In our example,
- <var class="var">crop,vflip</var> are in one linear chain, <var class="var">split</var> and
- <var class="var">overlay</var> are separately in another. The points where the linear
- chains join are labelled by names enclosed in square brackets. In the
- example, the split filter generates two outputs that are associated to
- the labels <var class="var">[main]</var> and <var class="var">[tmp]</var>.
- </p>
- <p>The stream sent to the second output of <var class="var">split</var>, labelled as
- <var class="var">[tmp]</var>, is processed through the <var class="var">crop</var> filter, which crops
- away the lower half part of the video, and then vertically flipped. The
- <var class="var">overlay</var> filter takes in input the first unchanged output of the
- split filter (which was labelled as <var class="var">[main]</var>), and overlay on its
- lower half the output generated by the <var class="var">crop,vflip</var> filterchain.
- </p>
- <p>Some filters take in input a list of parameters: they are specified
- after the filter name and an equal sign, and are separated from each other
- by a colon.
- </p>
- <p>There exist so-called <var class="var">source filters</var> that do not have an
- audio/video input, and <var class="var">sink filters</var> that will not have audio/video
- output.
- </p>
- <a name="graph2dot"></a>
- <h2 class="chapter">31 graph2dot<span class="pull-right"><a class="anchor hidden-xs" href="#graph2dot" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-graph2dot" aria-hidden="true">TOC</a></span></h2>
- <p>The <samp class="file">graph2dot</samp> program included in the FFmpeg <samp class="file">tools</samp>
- directory can be used to parse a filtergraph description and issue a
- corresponding textual representation in the dot language.
- </p>
- <p>Invoke the command:
- </p><div class="example">
- <pre class="example-preformatted">graph2dot -h
- </pre></div>
- <p>to see how to use <samp class="file">graph2dot</samp>.
- </p>
- <p>You can then pass the dot description to the <samp class="file">dot</samp> program (from
- the graphviz suite of programs) and obtain a graphical representation
- of the filtergraph.
- </p>
- <p>For example the sequence of commands:
- </p><div class="example">
- <pre class="example-preformatted">echo <var class="var">GRAPH_DESCRIPTION</var> | \
- tools/graph2dot -o graph.tmp && \
- dot -Tpng graph.tmp -o graph.png && \
- display graph.png
- </pre></div>
- <p>can be used to create and display an image representing the graph
- described by the <var class="var">GRAPH_DESCRIPTION</var> string. Note that this string must be
- a complete self-contained graph, with its inputs and outputs explicitly defined.
- For example if your command line is of the form:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i infile -vf scale=640:360 outfile
- </pre></div>
- <p>your <var class="var">GRAPH_DESCRIPTION</var> string will need to be of the form:
- </p><div class="example">
- <pre class="example-preformatted">nullsrc,scale=640:360,nullsink
- </pre></div>
- <p>you may also need to set the <var class="var">nullsrc</var> parameters and add a <var class="var">format</var>
- filter in order to simulate a specific input file.
- </p>
- <a name="Filtergraph-description"></a>
- <h2 class="chapter">32 Filtergraph description<span class="pull-right"><a class="anchor hidden-xs" href="#Filtergraph-description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Filtergraph-description" aria-hidden="true">TOC</a></span></h2>
- <p>A filtergraph is a directed graph of connected filters. It can contain
- cycles, and there can be multiple links between a pair of
- filters. Each link has one input pad on one side connecting it to one
- filter from which it takes its input, and one output pad on the other
- side connecting it to one filter accepting its output.
- </p>
- <p>Each filter in a filtergraph is an instance of a filter class
- registered in the application, which defines the features and the
- number of input and output pads of the filter.
- </p>
- <p>A filter with no input pads is called a "source", and a filter with no
- output pads is called a "sink".
- </p>
- <a class="anchor" id="Filtergraph-syntax"></a><a name="Filtergraph-syntax-1"></a>
- <h3 class="section">32.1 Filtergraph syntax<span class="pull-right"><a class="anchor hidden-xs" href="#Filtergraph-syntax-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Filtergraph-syntax-1" aria-hidden="true">TOC</a></span></h3>
- <p>A filtergraph has a textual representation, which is recognized by the
- <samp class="option">-filter</samp>/<samp class="option">-vf</samp>/<samp class="option">-af</samp> and
- <samp class="option">-filter_complex</samp> options in <code class="command">ffmpeg</code> and
- <samp class="option">-vf</samp>/<samp class="option">-af</samp> in <code class="command">ffplay</code>, and by the
- <code class="code">avfilter_graph_parse_ptr()</code> function defined in
- <samp class="file">libavfilter/avfilter.h</samp>.
- </p>
- <p>A filterchain consists of a sequence of connected filters, each one
- connected to the previous one in the sequence. A filterchain is
- represented by a list of ","-separated filter descriptions.
- </p>
- <p>A filtergraph consists of a sequence of filterchains. A sequence of
- filterchains is represented by a list of ";"-separated filterchain
- descriptions.
- </p>
- <p>A filter is represented by a string of the form:
- [<var class="var">in_link_1</var>]...[<var class="var">in_link_N</var>]<var class="var">filter_name</var>@<var class="var">id</var>=<var class="var">arguments</var>[<var class="var">out_link_1</var>]...[<var class="var">out_link_M</var>]
- </p>
- <p><var class="var">filter_name</var> is the name of the filter class of which the
- described filter is an instance of, and has to be the name of one of
- the filter classes registered in the program optionally followed by "@<var class="var">id</var>".
- The name of the filter class is optionally followed by a string
- "=<var class="var">arguments</var>".
- </p>
- <p><var class="var">arguments</var> is a string which contains the parameters used to
- initialize the filter instance. It may have one of two forms:
- </p><ul class="itemize mark-bullet">
- <li>A ’:’-separated list of <var class="var">key=value</var> pairs.
- </li><li>A ’:’-separated list of <var class="var">value</var>. In this case, the keys are assumed to be
- the option names in the order they are declared. E.g. the <code class="code">fade</code> filter
- declares three options in this order – <samp class="option">type</samp>, <samp class="option">start_frame</samp> and
- <samp class="option">nb_frames</samp>. Then the parameter list <var class="var">in:0:30</var> means that the value
- <var class="var">in</var> is assigned to the option <samp class="option">type</samp>, <var class="var">0</var> to
- <samp class="option">start_frame</samp> and <var class="var">30</var> to <samp class="option">nb_frames</samp>.
- </li><li>A ’:’-separated list of mixed direct <var class="var">value</var> and long <var class="var">key=value</var>
- pairs. The direct <var class="var">value</var> must precede the <var class="var">key=value</var> pairs, and
- follow the same constraints order of the previous point. The following
- <var class="var">key=value</var> pairs can be set in any preferred order.
- </li></ul>
- <p>If the option value itself is a list of items (e.g. the <code class="code">format</code> filter
- takes a list of pixel formats), the items in the list are usually separated by
- ‘<samp class="samp">|</samp>’.
- </p>
- <p>The list of arguments can be quoted using the character ‘<samp class="samp">'</samp>’ as initial
- and ending mark, and the character ‘<samp class="samp">\</samp>’ for escaping the characters
- within the quoted text; otherwise the argument string is considered
- terminated when the next special character (belonging to the set
- ‘<samp class="samp">[]=;,</samp>’) is encountered.
- </p>
- <p>A special syntax implemented in the <code class="command">ffmpeg</code> CLI tool allows loading
- option values from files. This is done be prepending a slash ’/’ to the option
- name, then the supplied value is interpreted as a path from which the actual
- value is loaded. E.g.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i <INPUT> -vf drawtext=/text=/tmp/some_text <OUTPUT>
- </pre></div>
- <p>will load the text to be drawn from <samp class="file">/tmp/some_text</samp>. API users wishing to
- implement a similar feature should use the <code class="code">avfilter_graph_segment_*()</code>
- functions together with custom IO code.
- </p>
- <p>The name and arguments of the filter are optionally preceded and
- followed by a list of link labels.
- A link label allows one to name a link and associate it to a filter output
- or input pad. The preceding labels <var class="var">in_link_1</var>
- ... <var class="var">in_link_N</var>, are associated to the filter input pads,
- the following labels <var class="var">out_link_1</var> ... <var class="var">out_link_M</var>, are
- associated to the output pads.
- </p>
- <p>When two link labels with the same name are found in the
- filtergraph, a link between the corresponding input and output pad is
- created.
- </p>
- <p>If an output pad is not labelled, it is linked by default to the first
- unlabelled input pad of the next filter in the filterchain.
- For example in the filterchain
- </p><div class="example">
- <pre class="example-preformatted">nullsrc, split[L1], [L2]overlay, nullsink
- </pre></div>
- <p>the split filter instance has two output pads, and the overlay filter
- instance two input pads. The first output pad of split is labelled
- "L1", the first input pad of overlay is labelled "L2", and the second
- output pad of split is linked to the second input pad of overlay,
- which are both unlabelled.
- </p>
- <p>In a filter description, if the input label of the first filter is not
- specified, "in" is assumed; if the output label of the last filter is not
- specified, "out" is assumed.
- </p>
- <p>In a complete filterchain all the unlabelled filter input and output
- pads must be connected. A filtergraph is considered valid if all the
- filter input and output pads of all the filterchains are connected.
- </p>
- <p>Leading and trailing whitespaces (space, tabs, or line feeds) separating tokens
- in the filtergraph specification are ignored. This means that the filtergraph
- can be expressed using empty lines and spaces to improve readability.
- </p>
- <p>For example, the filtergraph:
- </p><div class="example">
- <pre class="example-preformatted">testsrc,split[L1],hflip[L2];[L1][L2] hstack
- </pre></div>
- <p>can be represented as:
- </p><div class="example">
- <pre class="example-preformatted">testsrc,
- split [L1], hflip [L2];
- [L1][L2] hstack
- </pre></div>
- <p>Libavfilter will automatically insert <a class="ref" href="#scale">scale</a> filters where format
- conversion is required. It is possible to specify swscale flags
- for those automatically inserted scalers by prepending
- <code class="code">sws_flags=<var class="var">flags</var>;</code>
- to the filtergraph description.
- </p>
- <p>Here is a BNF description of the filtergraph syntax:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">NAME</var> ::= sequence of alphanumeric characters and '_'
- <var class="var">FILTER_NAME</var> ::= <var class="var">NAME</var>["@"<var class="var">NAME</var>]
- <var class="var">LINKLABEL</var> ::= "[" <var class="var">NAME</var> "]"
- <var class="var">LINKLABELS</var> ::= <var class="var">LINKLABEL</var> [<var class="var">LINKLABELS</var>]
- <var class="var">FILTER_ARGUMENTS</var> ::= sequence of chars (possibly quoted)
- <var class="var">FILTER</var> ::= [<var class="var">LINKLABELS</var>] <var class="var">FILTER_NAME</var> ["=" <var class="var">FILTER_ARGUMENTS</var>] [<var class="var">LINKLABELS</var>]
- <var class="var">FILTERCHAIN</var> ::= <var class="var">FILTER</var> [,<var class="var">FILTERCHAIN</var>]
- <var class="var">FILTERGRAPH</var> ::= [sws_flags=<var class="var">flags</var>;] <var class="var">FILTERCHAIN</var> [;<var class="var">FILTERGRAPH</var>]
- </pre></div>
- <a class="anchor" id="filtergraph-escaping"></a><a name="Notes-on-filtergraph-escaping"></a>
- <h3 class="section">32.2 Notes on filtergraph escaping<span class="pull-right"><a class="anchor hidden-xs" href="#Notes-on-filtergraph-escaping" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Notes-on-filtergraph-escaping" aria-hidden="true">TOC</a></span></h3>
- <p>Filtergraph description composition entails several levels of
- escaping. See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#quoting_005fand_005fescaping">the "Quoting and escaping"
- section in the ffmpeg-utils(1) manual</a> for more
- information about the employed escaping procedure.
- </p>
- <p>A first level escaping affects the content of each filter option
- value, which may contain the special character <code class="code">:</code> used to
- separate values, or one of the escaping characters <code class="code">\'</code>.
- </p>
- <p>A second level escaping affects the whole filter description, which
- may contain the escaping characters <code class="code">\'</code> or the special
- characters <code class="code">[],;</code> used by the filtergraph description.
- </p>
- <p>Finally, when you specify a filtergraph on a shell commandline, you
- need to perform a third level escaping for the shell special
- characters contained within it.
- </p>
- <p>For example, consider the following string to be embedded in
- the <a class="ref" href="#drawtext">drawtext</a> filter description <samp class="option">text</samp> value:
- </p><div class="example">
- <pre class="example-preformatted">this is a 'string': may contain one, or more, special characters
- </pre></div>
- <p>This string contains the <code class="code">'</code> special escaping character, and the
- <code class="code">:</code> special character, so it needs to be escaped in this way:
- </p><div class="example">
- <pre class="example-preformatted">text=this is a \'string\'\: may contain one, or more, special characters
- </pre></div>
- <p>A second level of escaping is required when embedding the filter
- description in a filtergraph description, in order to escape all the
- filtergraph special characters. Thus the example above becomes:
- </p><div class="example">
- <pre class="example-preformatted">drawtext=text=this is a \\\'string\\\'\\: may contain one\, or more\, special characters
- </pre></div>
- <p>(note that in addition to the <code class="code">\'</code> escaping special characters,
- also <code class="code">,</code> needs to be escaped).
- </p>
- <p>Finally an additional level of escaping is needed when writing the
- filtergraph description in a shell command, which depends on the
- escaping rules of the adopted shell. For example, assuming that
- <code class="code">\</code> is special and needs to be escaped with another <code class="code">\</code>, the
- previous string will finally result in:
- </p><div class="example">
- <pre class="example-preformatted">-vf "drawtext=text=this is a \\\\\\'string\\\\\\'\\\\: may contain one\\, or more\\, special characters"
- </pre></div>
- <p>In order to avoid cumbersome escaping when using a commandline tool accepting a
- filter specification as input, it is advisable to avoid direct inclusion of the
- filter or options specification in the shell.
- </p>
- <p>For example, in case of the <a class="ref" href="#drawtext">drawtext filter</a>, you might prefer to
- use the <samp class="option">textfile</samp> option in place of <samp class="option">text</samp> to specify the text
- to render.
- </p>
- <a name="Timeline-editing"></a>
- <h2 class="chapter">33 Timeline editing<span class="pull-right"><a class="anchor hidden-xs" href="#Timeline-editing" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Timeline-editing" aria-hidden="true">TOC</a></span></h2>
- <p>Some filters support a generic <samp class="option">enable</samp> option. For the filters
- supporting timeline editing, this option can be set to an expression which is
- evaluated before sending a frame to the filter. If the evaluation is non-zero,
- the filter will be enabled, otherwise the frame will be sent unchanged to the
- next filter in the filtergraph.
- </p>
- <p>The expression accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">t</samp>’</dt>
- <dd><p>timestamp expressed in seconds, NAN if the input timestamp is unknown
- </p>
- </dd>
- <dt>‘<samp class="samp">n</samp>’</dt>
- <dd><p>sequential number of the input frame, starting from 0
- </p>
- </dd>
- <dt>‘<samp class="samp">pos</samp>’</dt>
- <dd><p>the position in the file of the input frame, NAN if unknown; deprecated, do
- not use
- </p>
- </dd>
- <dt>‘<samp class="samp">w</samp>’</dt>
- <dt>‘<samp class="samp">h</samp>’</dt>
- <dd><p>width and height of the input frame if video
- </p></dd>
- </dl>
- <p>Additionally, these filters support an <samp class="option">enable</samp> command that can be used
- to re-define the expression.
- </p>
- <p>Like any other filtering option, the <samp class="option">enable</samp> option follows the same
- rules.
- </p>
- <p>For example, to enable a blur filter (<a class="ref" href="#smartblur">smartblur</a>) from 10 seconds to 3
- minutes, and a <a class="ref" href="#curves">curves</a> filter starting at 3 seconds:
- </p><div class="example">
- <pre class="example-preformatted">smartblur = enable='between(t,10,3*60)',
- curves = enable='gte(t,3)' : preset=cross_process
- </pre></div>
- <p>See <code class="code">ffmpeg -filters</code> to view which filters have timeline support.
- </p>
- <a class="anchor" id="commands"></a><a name="Changing-options-at-runtime-with-a-command"></a>
- <h2 class="chapter">34 Changing options at runtime with a command<span class="pull-right"><a class="anchor hidden-xs" href="#Changing-options-at-runtime-with-a-command" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Changing-options-at-runtime-with-a-command" aria-hidden="true">TOC</a></span></h2>
- <p>Some options can be changed during the operation of the filter using
- a command. These options are marked ’T’ on the output of
- <code class="command">ffmpeg</code> <samp class="option">-h filter=<name of filter></samp>.
- The name of the command is the name of the option and the argument is
- the new value.
- </p>
- <a class="anchor" id="framesync"></a><a name="Options-for-filters-with-several-inputs-_0028framesync_0029"></a>
- <h2 class="chapter">35 Options for filters with several inputs (framesync)<span class="pull-right"><a class="anchor hidden-xs" href="#Options-for-filters-with-several-inputs-_0028framesync_0029" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-for-filters-with-several-inputs-_0028framesync_0029" aria-hidden="true">TOC</a></span></h2>
- <p>Some filters with several inputs support a common set of options.
- These options can only be set by name, not with the short notation.
- </p>
- <dl class="table">
- <dt><samp class="option">eof_action</samp></dt>
- <dd><p>The action to take when EOF is encountered on the secondary input; it accepts
- one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">repeat</samp></dt>
- <dd><p>Repeat the last frame (the default).
- </p></dd>
- <dt><samp class="option">endall</samp></dt>
- <dd><p>End both streams.
- </p></dd>
- <dt><samp class="option">pass</samp></dt>
- <dd><p>Pass the main input through.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>If set to 1, force the output to terminate when the shortest input
- terminates. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">repeatlast</samp></dt>
- <dd><p>If set to 1, force the filter to extend the last frame of secondary streams
- until the end of the primary stream. A value of 0 disables this behavior.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">ts_sync_mode</samp></dt>
- <dd><p>How strictly to sync streams based on secondary input timestamps; it accepts
- one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">default</samp></dt>
- <dd><p>Frame from secondary input with the nearest lower or equal timestamp to the
- primary input frame.
- </p></dd>
- <dt><samp class="option">nearest</samp></dt>
- <dd><p>Frame from secondary input with the absolute nearest timestamp to the primary
- input frame.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Audio-Filters"></a>
- <h2 class="chapter">36 Audio Filters<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>When you configure your FFmpeg build, you can disable any of the
- existing filters using <code class="code">--disable-filters</code>.
- The configure output will show the audio filters included in your
- build.
- </p>
- <p>Below is a description of the currently available audio filters.
- </p>
- <a name="aap"></a>
- <h3 class="section">36.1 aap<span class="pull-right"><a class="anchor hidden-xs" href="#aap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aap" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Affine Projection algorithm to the first audio stream using the second audio stream.
- </p>
- <p>This adaptive filter is used to estimate unknown audio based on multiple input audio samples.
- Affine projection algorithm can make trade-offs between computation complexity with convergence speed.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set the filter order.
- </p>
- </dd>
- <dt><samp class="option">projection</samp></dt>
- <dd><p>Set the projection order.
- </p>
- </dd>
- <dt><samp class="option">mu</samp></dt>
- <dd><p>Set the filter mu.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set the coefficient to initialize internal covariance matrix.
- </p>
- </dd>
- <dt><samp class="option">out_mode</samp></dt>
- <dd><p>Set the filter output samples. It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Pass the 1st input.
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>Pass the 2nd input.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Pass difference between desired, 2nd input and error signal estimate.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Pass difference between input, 1st input and error signal estimate.
- </p>
- </dd>
- <dt><samp class="option">e</samp></dt>
- <dd><p>Pass error signal estimated samples.
- </p>
- <p>Default value is <var class="var">o</var>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set which precision to use when processing samples.
- </p>
- <dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Auto pick internal sample format depending on other filters.
- </p>
- </dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>Always use single-floating point precision sample format.
- </p>
- </dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>Always use double-floating point precision sample format.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="acompressor"></a>
- <h3 class="section">36.2 acompressor<span class="pull-right"><a class="anchor hidden-xs" href="#acompressor" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acompressor" aria-hidden="true">TOC</a></span></h3>
- <p>A compressor is mainly used to reduce the dynamic range of a signal.
- Especially modern music is mostly compressed at a high ratio to
- improve the overall loudness. It’s done to get the highest attention
- of a listener, "fatten" the sound and bring more "power" to the track.
- If a signal is compressed too much it may sound dull or "dead"
- afterwards or it may start to "pump" (which could be a powerful effect
- but can also destroy a track completely).
- The right compression is the key to reach a professional sound and is
- the high art of mixing and mastering. Because of its complex settings
- it may take a long time to get the right feeling for this kind of effect.
- </p>
- <p>Compression is done by detecting the volume above a chosen level
- <code class="code">threshold</code> and dividing it by the factor set with <code class="code">ratio</code>.
- So if you set the threshold to -12dB and your signal reaches -6dB a ratio
- of 2:1 will result in a signal at -9dB. Because an exact manipulation of
- the signal would cause distortion of the waveform the reduction can be
- levelled over the time. This is done by setting "Attack" and "Release".
- <code class="code">attack</code> determines how long the signal has to rise above the threshold
- before any reduction will occur and <code class="code">release</code> sets the time the signal
- has to fall below the threshold to reduce the reduction again. Shorter signals
- than the chosen attack time will be left untouched.
- The overall reduction of the signal can be made up afterwards with the
- <code class="code">makeup</code> setting. So compressing the peaks of a signal about 6dB and
- raising the makeup to this level results in a signal twice as loud than the
- source. To gain a softer entry in the compression the <code class="code">knee</code> flattens the
- hard edge at the threshold in the range of the chosen decibels.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain. Default is 1. Range is between 0.015625 and 64.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set mode of compressor operation. Can be <code class="code">upward</code> or <code class="code">downward</code>.
- Default is <code class="code">downward</code>.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>If a signal of stream rises above this level it will affect the gain
- reduction.
- By default it is 0.125. Range is between 0.00097563 and 1.
- </p>
- </dd>
- <dt><samp class="option">ratio</samp></dt>
- <dd><p>Set a ratio by which the signal is reduced. 1:2 means that if the level
- rose 4dB above the threshold, it will be only 2dB above after the reduction.
- Default is 2. Range is between 1 and 20.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Amount of milliseconds the signal has to rise above the threshold before gain
- reduction starts. Default is 20. Range is between 0.01 and 2000.
- </p>
- </dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Amount of milliseconds the signal has to fall below the threshold before
- reduction is decreased again. Default is 250. Range is between 0.01 and 9000.
- </p>
- </dd>
- <dt><samp class="option">makeup</samp></dt>
- <dd><p>Set the amount by how much signal will be amplified after processing.
- Default is 1. Range is from 1 to 64.
- </p>
- </dd>
- <dt><samp class="option">knee</samp></dt>
- <dd><p>Curve the sharp knee around the threshold to enter gain reduction more softly.
- Default is 2.82843. Range is between 1 and 8.
- </p>
- </dd>
- <dt><samp class="option">link</samp></dt>
- <dd><p>Choose if the <code class="code">average</code> level between all channels of input stream
- or the louder(<code class="code">maximum</code>) channel of input stream affects the
- reduction. Default is <code class="code">average</code>.
- </p>
- </dd>
- <dt><samp class="option">detection</samp></dt>
- <dd><p>Should the exact signal be taken in case of <code class="code">peak</code> or an RMS one in case
- of <code class="code">rms</code>. Default is <code class="code">rms</code> which is mostly smoother.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>How much to use compressed signal in output. Default is 1.
- Range is between 0 and 1.
- </p></dd>
- </dl>
- <a name="Commands"></a>
- <h4 class="subsection">36.2.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="acontrast"></a>
- <h3 class="section">36.3 acontrast<span class="pull-right"><a class="anchor hidden-xs" href="#acontrast" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acontrast" aria-hidden="true">TOC</a></span></h3>
- <p>Simple audio dynamic range compression/expansion filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">contrast</samp></dt>
- <dd><p>Set contrast. Default is 33. Allowed range is between 0 and 100.
- </p></dd>
- </dl>
- <a name="acopy"></a>
- <h3 class="section">36.4 acopy<span class="pull-right"><a class="anchor hidden-xs" href="#acopy" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acopy" aria-hidden="true">TOC</a></span></h3>
- <p>Copy the input audio source unchanged to the output. This is mainly useful for
- testing purposes.
- </p>
- <a name="acrossfade"></a>
- <h3 class="section">36.5 acrossfade<span class="pull-right"><a class="anchor hidden-xs" href="#acrossfade" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acrossfade" aria-hidden="true">TOC</a></span></h3>
- <p>Apply cross fade from one input audio stream to another input audio stream.
- The cross fade is applied for specified duration near the end of first stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs, n</samp></dt>
- <dd><p>Specify the number of inputs to crossfade. When crossfading multiple inputs,
- each input will be concatenated and crossfaded in sequence, similar to the
- <a class="ref" href="#concat-filter">concat filter</a>. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, ns</samp></dt>
- <dd><p>Specify the number of samples for which the cross fade effect has to last.
- At the end of the cross fade effect the first input audio will be completely
- silent. Default is 44100.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Specify the duration of the cross fade effect. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- By default the duration is determined by <var class="var">nb_samples</var>.
- If set this option is used instead of <var class="var">nb_samples</var>.
- </p>
- </dd>
- <dt><samp class="option">overlap, o</samp></dt>
- <dd><p>Should first stream end overlap with second stream start. Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">curve1</samp></dt>
- <dd><p>Set curve for cross fade transition for first stream.
- </p>
- </dd>
- <dt><samp class="option">curve2</samp></dt>
- <dd><p>Set curve for cross fade transition for second stream.
- </p>
- <p>For description of available curve types see <a class="ref" href="#afade">afade</a> filter description.
- </p></dd>
- </dl>
- <a name="Examples-45"></a>
- <h4 class="subsection">36.5.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-45" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-45" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Cross fade from one input to another:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i first.flac -i second.flac -filter_complex acrossfade=d=10:c1=exp:c2=exp output.flac
- </pre></div>
- </li><li>Cross fade from one input to another but without overlapping:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i first.flac -i second.flac -filter_complex acrossfade=d=10:o=0:c1=exp:c2=exp output.flac
- </pre></div>
- <p>Concatenate multiple inputs with cross fade between each:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i first.flac -i second.flac -i third.flac -filter_complex acrossfade=n=3 output.flac
- </pre></div>
- </li></ul>
- <a name="acrossover"></a>
- <h3 class="section">36.6 acrossover<span class="pull-right"><a class="anchor hidden-xs" href="#acrossover" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acrossover" aria-hidden="true">TOC</a></span></h3>
- <p>Split audio stream into several bands.
- </p>
- <p>This filter splits audio stream into two or more frequency ranges.
- Summing all streams back will give flat output.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">split</samp></dt>
- <dd><p>Set split frequencies. Those must be positive and increasing.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order for each band split. This controls filter roll-off or steepness
- of filter transfer function.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">2nd</samp>’</dt>
- <dd><p>12 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">4th</samp>’</dt>
- <dd><p>24 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">6th</samp>’</dt>
- <dd><p>36 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">8th</samp>’</dt>
- <dd><p>48 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">10th</samp>’</dt>
- <dd><p>60 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">12th</samp>’</dt>
- <dd><p>72 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">14th</samp>’</dt>
- <dd><p>84 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">16th</samp>’</dt>
- <dd><p>96 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">18th</samp>’</dt>
- <dd><p>108 dB per octave.
- </p></dd>
- <dt>‘<samp class="samp">20th</samp>’</dt>
- <dd><p>120 dB per octave.
- </p></dd>
- </dl>
- <p>Default is <var class="var">4th</var>.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set input gain level. Allowed range is from 0 to 1. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">gains</samp></dt>
- <dd><p>Set output gain for each band. Default value is 1 for all bands.
- </p>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set which precision to use when processing samples.
- </p>
- <dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Auto pick internal sample format depending on other filters.
- </p>
- </dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>Always use single-floating point precision sample format.
- </p>
- </dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>Always use double-floating point precision sample format.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">auto</code>.
- </p></dd>
- </dl>
- <a name="Examples-46"></a>
- <h4 class="subsection">36.6.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-46" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-46" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Split input audio stream into two bands (low and high) with split frequency of 1500 Hz,
- each band will be in separate stream:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.flac -filter_complex 'acrossover=split=1500[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
- </pre></div>
- </li><li>Same as above, but with higher filter order:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.flac -filter_complex 'acrossover=split=1500:order=8th[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
- </pre></div>
- </li><li>Same as above, but also with additional middle band (frequencies between 1500 and 8000):
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.flac -filter_complex 'acrossover=split=1500 8000:order=8th[LOW][MID][HIGH]' -map '[LOW]' low.wav -map '[MID]' mid.wav -map '[HIGH]' high.wav
- </pre></div>
- </li></ul>
- <a name="acrusher"></a>
- <h3 class="section">36.7 acrusher<span class="pull-right"><a class="anchor hidden-xs" href="#acrusher" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acrusher" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce audio bit resolution.
- </p>
- <p>This filter is bit crusher with enhanced functionality. A bit crusher
- is used to audibly reduce number of bits an audio signal is sampled
- with. This doesn’t change the bit depth at all, it just produces the
- effect. Material reduced in bit depth sounds more harsh and "digital".
- This filter is able to even round to continuous values instead of discrete
- bit depths.
- Additionally it has a D/C offset which results in different crushing of
- the lower and the upper half of the signal.
- An Anti-Aliasing setting is able to produce "softer" crushing sounds.
- </p>
- <p>Another feature of this filter is the logarithmic mode.
- This setting switches from linear distances between bits to logarithmic ones.
- The result is a much more "natural" sounding crusher which doesn’t gate low
- signals for example. The human ear has a logarithmic perception,
- so this kind of crushing is much more pleasant.
- Logarithmic crushing is also able to get anti-aliased.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set level in.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set level out.
- </p>
- </dd>
- <dt><samp class="option">bits</samp></dt>
- <dd><p>Set bit reduction.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>Set mixing amount.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Can be linear: <code class="code">lin</code> or logarithmic: <code class="code">log</code>.
- </p>
- </dd>
- <dt><samp class="option">dc</samp></dt>
- <dd><p>Set DC.
- </p>
- </dd>
- <dt><samp class="option">aa</samp></dt>
- <dd><p>Set anti-aliasing.
- </p>
- </dd>
- <dt><samp class="option">samples</samp></dt>
- <dd><p>Set sample reduction.
- </p>
- </dd>
- <dt><samp class="option">lfo</samp></dt>
- <dd><p>Enable LFO. By default disabled.
- </p>
- </dd>
- <dt><samp class="option">lforange</samp></dt>
- <dd><p>Set LFO range.
- </p>
- </dd>
- <dt><samp class="option">lforate</samp></dt>
- <dd><p>Set LFO rate.
- </p></dd>
- </dl>
- <a name="Commands-1"></a>
- <h4 class="subsection">36.7.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-1" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="acue"></a>
- <h3 class="section">36.8 acue<span class="pull-right"><a class="anchor hidden-xs" href="#acue" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-acue" aria-hidden="true">TOC</a></span></h3>
- <p>Delay audio filtering until a given wallclock timestamp. See the <a class="ref" href="#cue">cue</a>
- filter.
- </p>
- <a name="adeclick"></a>
- <h3 class="section">36.9 adeclick<span class="pull-right"><a class="anchor hidden-xs" href="#adeclick" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adeclick" aria-hidden="true">TOC</a></span></h3>
- <p>Remove impulsive noise from input audio.
- </p>
- <p>Samples detected as impulsive noise are replaced by interpolated samples using
- autoregressive modelling.
- </p>
- <dl class="table">
- <dt><samp class="option">window, w</samp></dt>
- <dd><p>Set window size, in milliseconds. Allowed range is from <code class="code">10</code> to
- <code class="code">100</code>. Default value is <code class="code">55</code> milliseconds.
- This sets size of window which will be processed at once.
- </p>
- </dd>
- <dt><samp class="option">overlap, o</samp></dt>
- <dd><p>Set window overlap, in percentage of window size. Allowed range is from
- <code class="code">50</code> to <code class="code">95</code>. Default value is <code class="code">75</code> percent.
- Setting this to a very high value increases impulsive noise removal but makes
- whole process much slower.
- </p>
- </dd>
- <dt><samp class="option">arorder, a</samp></dt>
- <dd><p>Set autoregression order, in percentage of window size. Allowed range is from
- <code class="code">0</code> to <code class="code">25</code>. Default value is <code class="code">2</code> percent. This option also
- controls quality of interpolated samples using neighbour good samples.
- </p>
- </dd>
- <dt><samp class="option">threshold, t</samp></dt>
- <dd><p>Set threshold value. Allowed range is from <code class="code">1</code> to <code class="code">100</code>.
- Default value is <code class="code">2</code>.
- This controls the strength of impulsive noise which is going to be removed.
- The lower value, the more samples will be detected as impulsive noise.
- </p>
- </dd>
- <dt><samp class="option">burst, b</samp></dt>
- <dd><p>Set burst fusion, in percentage of window size. Allowed range is <code class="code">0</code> to
- <code class="code">10</code>. Default value is <code class="code">2</code>.
- If any two samples detected as noise are spaced less than this value then any
- sample between those two samples will be also detected as noise.
- </p>
- </dd>
- <dt><samp class="option">method, m</samp></dt>
- <dd><p>Set overlap method.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">add, a</samp></dt>
- <dd><p>Select overlap-add method. Even not interpolated samples are slightly
- changed with this method.
- </p>
- </dd>
- <dt><samp class="option">save, s</samp></dt>
- <dd><p>Select overlap-save method. Not interpolated samples remain unchanged.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">a</code>.
- </p></dd>
- </dl>
- <a name="adeclip"></a>
- <h3 class="section">36.10 adeclip<span class="pull-right"><a class="anchor hidden-xs" href="#adeclip" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adeclip" aria-hidden="true">TOC</a></span></h3>
- <p>Remove clipped samples from input audio.
- </p>
- <p>Samples detected as clipped are replaced by interpolated samples using
- autoregressive modelling.
- </p>
- <dl class="table">
- <dt><samp class="option">window, w</samp></dt>
- <dd><p>Set window size, in milliseconds. Allowed range is from <code class="code">10</code> to <code class="code">100</code>.
- Default value is <code class="code">55</code> milliseconds.
- This sets size of window which will be processed at once.
- </p>
- </dd>
- <dt><samp class="option">overlap, o</samp></dt>
- <dd><p>Set window overlap, in percentage of window size. Allowed range is from <code class="code">50</code>
- to <code class="code">95</code>. Default value is <code class="code">75</code> percent.
- </p>
- </dd>
- <dt><samp class="option">arorder, a</samp></dt>
- <dd><p>Set autoregression order, in percentage of window size. Allowed range is from
- <code class="code">0</code> to <code class="code">25</code>. Default value is <code class="code">8</code> percent. This option also controls
- quality of interpolated samples using neighbour good samples.
- </p>
- </dd>
- <dt><samp class="option">threshold, t</samp></dt>
- <dd><p>Set threshold value. Allowed range is from <code class="code">1</code> to <code class="code">100</code>.
- Default value is <code class="code">10</code>. Higher values make clip detection less aggressive.
- </p>
- </dd>
- <dt><samp class="option">hsize, n</samp></dt>
- <dd><p>Set size of histogram used to detect clips. Allowed range is from <code class="code">100</code> to <code class="code">9999</code>.
- Default value is <code class="code">1000</code>. Higher values make clip detection less aggressive.
- </p>
- </dd>
- <dt><samp class="option">method, m</samp></dt>
- <dd><p>Set overlap method.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">add, a</samp></dt>
- <dd><p>Select overlap-add method. Even not interpolated samples are slightly changed
- with this method.
- </p>
- </dd>
- <dt><samp class="option">save, s</samp></dt>
- <dd><p>Select overlap-save method. Not interpolated samples remain unchanged.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">a</code>.
- </p></dd>
- </dl>
- <a name="adecorrelate"></a>
- <h3 class="section">36.11 adecorrelate<span class="pull-right"><a class="anchor hidden-xs" href="#adecorrelate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adecorrelate" aria-hidden="true">TOC</a></span></h3>
- <p>Apply decorrelation to input audio stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">stages</samp></dt>
- <dd><p>Set decorrelation stages of filtering. Allowed
- range is from 1 to 16. Default value is 6.
- </p>
- </dd>
- <dt><samp class="option">seed</samp></dt>
- <dd><p>Set random seed used for setting delay in samples across channels.
- </p></dd>
- </dl>
- <a name="adelay"></a>
- <h3 class="section">36.12 adelay<span class="pull-right"><a class="anchor hidden-xs" href="#adelay" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adelay" aria-hidden="true">TOC</a></span></h3>
- <p>Delay one or more audio channels.
- </p>
- <p>Samples in delayed channel are filled with silence.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">delays</samp></dt>
- <dd><p>Set list of delays in milliseconds for each channel separated by ’|’.
- Unused delays will be silently ignored. If number of given delays is
- smaller than number of channels all remaining channels will not be delayed.
- If you want to delay exact number of samples, append ’S’ to number.
- If you want instead to delay in seconds, append ’s’ to number.
- </p>
- </dd>
- <dt><samp class="option">all</samp></dt>
- <dd><p>Use last set delay for all remaining channels. By default is disabled.
- This option if enabled changes how option <code class="code">delays</code> is interpreted.
- </p></dd>
- </dl>
- <a name="Examples-47"></a>
- <h4 class="subsection">36.12.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-47" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-47" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Delay first channel by 1.5 seconds, the third channel by 0.5 seconds and leave
- the second channel (and any other channels that may be present) unchanged.
- <div class="example">
- <pre class="example-preformatted">adelay=1500|0|500
- </pre></div>
- </li><li>Delay second channel by 500 samples, the third channel by 700 samples and leave
- the first channel (and any other channels that may be present) unchanged.
- <div class="example">
- <pre class="example-preformatted">adelay=0|500S|700S
- </pre></div>
- </li><li>Delay all channels by same number of samples:
- <div class="example">
- <pre class="example-preformatted">adelay=delays=64S:all=1
- </pre></div>
- </li></ul>
- <a name="adenorm"></a>
- <h3 class="section">36.13 adenorm<span class="pull-right"><a class="anchor hidden-xs" href="#adenorm" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adenorm" aria-hidden="true">TOC</a></span></h3>
- <p>Remedy denormals in audio by adding extremely low-level noise.
- </p>
- <p>This filter shall be placed before any filter that can produce denormals.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set level of added noise in dB. Default is <code class="code">-351</code>.
- Allowed range is from -451 to -90.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set type of added noise.
- </p>
- <dl class="table">
- <dt><samp class="option">dc</samp></dt>
- <dd><p>Add DC signal.
- </p></dd>
- <dt><samp class="option">ac</samp></dt>
- <dd><p>Add AC signal.
- </p></dd>
- <dt><samp class="option">square</samp></dt>
- <dd><p>Add square signal.
- </p></dd>
- <dt><samp class="option">pulse</samp></dt>
- <dd><p>Add pulse signal.
- </p></dd>
- </dl>
- <p>Default is <code class="code">dc</code>.
- </p></dd>
- </dl>
- <a name="Commands-2"></a>
- <h4 class="subsection">36.13.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-2" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="aderivative_002c-aintegral"></a>
- <h3 class="section">36.14 aderivative, aintegral<span class="pull-right"><a class="anchor hidden-xs" href="#aderivative_002c-aintegral" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aderivative_002c-aintegral" aria-hidden="true">TOC</a></span></h3>
- <p>Compute derivative/integral of audio stream.
- </p>
- <p>Applying both filters one after another produces original audio.
- </p>
- <a name="adrc"></a>
- <h3 class="section">36.15 adrc<span class="pull-right"><a class="anchor hidden-xs" href="#adrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adrc" aria-hidden="true">TOC</a></span></h3>
- <p>Apply spectral dynamic range controller filter to input audio stream.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">transfer</samp></dt>
- <dd><p>Set the transfer expression.
- </p>
- <p>The expression can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">ch</samp></dt>
- <dd><p>current channel number
- </p>
- </dd>
- <dt><samp class="option">sn</samp></dt>
- <dd><p>current sample number
- </p>
- </dd>
- <dt><samp class="option">nb_channels</samp></dt>
- <dd><p>number of channels
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>timestamp expressed in seconds
- </p>
- </dd>
- <dt><samp class="option">sr</samp></dt>
- <dd><p>sample rate
- </p>
- </dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>current frequency power value, in dB
- </p>
- </dd>
- <dt><samp class="option">f</samp></dt>
- <dd><p>current frequency in Hz
- </p></dd>
- </dl>
- <p>Default value is <code class="code">p</code>.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Set the attack in milliseconds. Default is <code class="code">50</code> milliseconds.
- Allowed range is from 1 to 1000 milliseconds.
- </p></dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Set the release in milliseconds. Default is <code class="code">100</code> milliseconds.
- Allowed range is from 5 to 2000 milliseconds.
- </p></dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set which channels to filter, by default <code class="code">all</code> channels in audio stream are filtered.
- </p></dd>
- </dl>
- <a name="Commands-3"></a>
- <h4 class="subsection">36.15.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-3" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-48"></a>
- <h4 class="subsection">36.15.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-48" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-48" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply spectral compression to all frequencies with threshold of -50 dB and 1:6 ratio:
- <div class="example">
- <pre class="example-preformatted">adrc=transfer='if(gt(p,-50),-50+(p-(-50))/6,p)':attack=50:release=100
- </pre></div>
- </li><li>Similar to above but with 1:2 ratio and filtering only front center channel:
- <div class="example">
- <pre class="example-preformatted">adrc=transfer='if(gt(p,-50),-50+(p-(-50))/2,p)':attack=50:release=100:channels=FC
- </pre></div>
- </li><li>Apply spectral noise gate to all frequencies with threshold of -85 dB and with short attack time and short release time:
- <div class="example">
- <pre class="example-preformatted">adrc=transfer='if(lte(p,-85),p-800,p)':attack=1:release=5
- </pre></div>
- </li><li>Apply spectral expansion to all frequencies with threshold of -10 dB and 1:2 ratio:
- <div class="example">
- <pre class="example-preformatted">adrc=transfer='if(lt(p,-10),-10+(p-(-10))*2,p)':attack=50:release=100
- </pre></div>
- </li><li>Apply limiter to max -60 dB to all frequencies, with attack of 2 ms and release of 10 ms:
- <div class="example">
- <pre class="example-preformatted">adrc=transfer='min(p,-60)':attack=2:release=10
- </pre></div>
- </li></ul>
- <a name="adynamicequalizer"></a>
- <h3 class="section">36.16 adynamicequalizer<span class="pull-right"><a class="anchor hidden-xs" href="#adynamicequalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adynamicequalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Apply dynamic equalization to input audio stream.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set the detection threshold used to trigger equalization.
- Threshold detection is using detection filter.
- Default value is 0. Allowed range is from 0 to 100.
- </p>
- </dd>
- <dt><samp class="option">dfrequency</samp></dt>
- <dd><p>Set the detection frequency in Hz used for detection filter used to trigger equalization.
- Default value is 1000 Hz. Allowed range is between 2 and 1000000 Hz.
- </p>
- </dd>
- <dt><samp class="option">dqfactor</samp></dt>
- <dd><p>Set the detection resonance factor for detection filter used to trigger equalization.
- Default value is 1. Allowed range is from 0.001 to 1000.
- </p>
- </dd>
- <dt><samp class="option">tfrequency</samp></dt>
- <dd><p>Set the target frequency of equalization filter.
- Default value is 1000 Hz. Allowed range is between 2 and 1000000 Hz.
- </p>
- </dd>
- <dt><samp class="option">tqfactor</samp></dt>
- <dd><p>Set the target resonance factor for target equalization filter.
- Default value is 1. Allowed range is from 0.001 to 1000.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Set the amount of milliseconds the signal from detection has to rise above
- the detection threshold before equalization starts.
- Default is 20. Allowed range is between 1 and 2000.
- </p>
- </dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Set the amount of milliseconds the signal from detection has to fall below the
- detection threshold before equalization ends.
- Default is 200. Allowed range is between 1 and 2000.
- </p>
- </dd>
- <dt><samp class="option">ratio</samp></dt>
- <dd><p>Set the ratio by which the equalization gain is raised.
- Default is 1. Allowed range is between 0 and 30.
- </p>
- </dd>
- <dt><samp class="option">makeup</samp></dt>
- <dd><p>Set the makeup offset by which the equalization gain is raised.
- Default is 0. Allowed range is between 0 and 100.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Set the max allowed cut/boost amount. Default is 50.
- Allowed range is from 1 to 200.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the mode of filter operation, can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">listen</samp>’</dt>
- <dd><p>Output only isolated detection signal.
- </p></dd>
- <dt>‘<samp class="samp">cutbelow</samp>’</dt>
- <dd><p>Cut frequencies below detection threshold.
- </p></dd>
- <dt>‘<samp class="samp">cutabove</samp>’</dt>
- <dd><p>Cut frequencies above detection threshold.
- </p></dd>
- <dt>‘<samp class="samp">boostbelow</samp>’</dt>
- <dd><p>Boost frequencies below detection threshold.
- </p></dd>
- <dt>‘<samp class="samp">boostabove</samp>’</dt>
- <dd><p>Boost frequencies above detection threshold.
- </p></dd>
- </dl>
- <p>Default mode is ‘<samp class="samp">cutbelow</samp>’.
- </p>
- </dd>
- <dt><samp class="option">dftype</samp></dt>
- <dd><p>Set the type of detection filter, can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">bandpass</samp>’</dt>
- <dt>‘<samp class="samp">lowpass</samp>’</dt>
- <dt>‘<samp class="samp">highpass</samp>’</dt>
- <dt>‘<samp class="samp">peak</samp>’</dt>
- </dl>
- <p>Default type is ‘<samp class="samp">bandpass</samp>’.
- </p>
- </dd>
- <dt><samp class="option">tftype</samp></dt>
- <dd><p>Set the type of target filter, can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">bell</samp>’</dt>
- <dt>‘<samp class="samp">lowshelf</samp>’</dt>
- <dt>‘<samp class="samp">highshelf</samp>’</dt>
- </dl>
- <p>Default type is ‘<samp class="samp">bell</samp>’.
- </p>
- </dd>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Automatically gather threshold from detection filter. By default
- is ‘<samp class="samp">disabled</samp>’.
- This option is useful to detect threshold in certain time frame of
- input audio stream, in such case option value is changed at runtime.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">disabled</samp>’</dt>
- <dd><p>Disable using automatically gathered threshold value.
- </p></dd>
- <dt>‘<samp class="samp">off</samp>’</dt>
- <dd><p>Stop picking threshold value.
- </p></dd>
- <dt>‘<samp class="samp">on</samp>’</dt>
- <dd><p>Start picking threshold value.
- </p></dd>
- <dt>‘<samp class="samp">adaptive</samp>’</dt>
- <dd><p>Adaptively pick threshold value, by calculating sliding window entropy.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set which precision to use when processing samples.
- </p>
- <dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Auto pick internal sample format depending on other filters.
- </p>
- </dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>Always use single-floating point precision sample format.
- </p>
- </dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>Always use double-floating point precision sample format.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-4"></a>
- <h4 class="subsection">36.16.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-4" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="adynamicsmooth"></a>
- <h3 class="section">36.17 adynamicsmooth<span class="pull-right"><a class="anchor hidden-xs" href="#adynamicsmooth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adynamicsmooth" aria-hidden="true">TOC</a></span></h3>
- <p>Apply dynamic smoothing to input audio stream.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">sensitivity</samp></dt>
- <dd><p>Set an amount of sensitivity to frequency fluctations. Default is 2.
- Allowed range is from 0 to 1e+06.
- </p>
- </dd>
- <dt><samp class="option">basefreq</samp></dt>
- <dd><p>Set a base frequency for smoothing. Default value is 22050.
- Allowed range is from 2 to 1e+06.
- </p></dd>
- </dl>
- <a name="Commands-5"></a>
- <h4 class="subsection">36.17.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-5" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="aecho"></a>
- <h3 class="section">36.18 aecho<span class="pull-right"><a class="anchor hidden-xs" href="#aecho" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aecho" aria-hidden="true">TOC</a></span></h3>
- <p>Apply echoing to the input audio.
- </p>
- <p>Echoes are reflected sound and can occur naturally amongst mountains
- (and sometimes large buildings) when talking or shouting; digital echo
- effects emulate this behaviour and are often used to help fill out the
- sound of a single instrument or vocal. The time difference between the
- original signal and the reflection is the <code class="code">delay</code>, and the
- loudness of the reflected signal is the <code class="code">decay</code>.
- Multiple echoes can have different delays and decays.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">in_gain</samp></dt>
- <dd><p>Set input gain of reflected signal. Default is <code class="code">0.6</code>.
- </p>
- </dd>
- <dt><samp class="option">out_gain</samp></dt>
- <dd><p>Set output gain of reflected signal. Default is <code class="code">0.3</code>.
- </p>
- </dd>
- <dt><samp class="option">delays</samp></dt>
- <dd><p>Set list of time intervals in milliseconds between original signal and reflections
- separated by ’|’. Allowed range for each <code class="code">delay</code> is <code class="code">(0 - 90000.0]</code>.
- Default is <code class="code">1000</code>.
- </p>
- </dd>
- <dt><samp class="option">decays</samp></dt>
- <dd><p>Set list of loudness of reflected signals separated by ’|’.
- Allowed range for each <code class="code">decay</code> is <code class="code">(0 - 1.0]</code>.
- Default is <code class="code">0.5</code>.
- </p></dd>
- </dl>
- <a name="Examples-49"></a>
- <h4 class="subsection">36.18.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-49" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-49" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make it sound as if there are twice as many instruments as are actually playing:
- <div class="example">
- <pre class="example-preformatted">aecho=0.8:0.88:60:0.4
- </pre></div>
- </li><li>If delay is very short, then it sounds like a (metallic) robot playing music:
- <div class="example">
- <pre class="example-preformatted">aecho=0.8:0.88:6:0.4
- </pre></div>
- </li><li>A longer delay will sound like an open air concert in the mountains:
- <div class="example">
- <pre class="example-preformatted">aecho=0.8:0.9:1000:0.3
- </pre></div>
- </li><li>Same as above but with one more mountain:
- <div class="example">
- <pre class="example-preformatted">aecho=0.8:0.9:1000|1800:0.3|0.25
- </pre></div>
- </li></ul>
- <a name="aemphasis"></a>
- <h3 class="section">36.19 aemphasis<span class="pull-right"><a class="anchor hidden-xs" href="#aemphasis" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aemphasis" aria-hidden="true">TOC</a></span></h3>
- <p>Audio emphasis filter creates or restores material directly taken from LPs or
- emphased CDs with different filter curves. E.g. to store music on vinyl the
- signal has to be altered by a filter first to even out the disadvantages of
- this recording medium.
- Once the material is played back the inverse filter has to be applied to
- restore the distortion of the frequency response.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output gain.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set filter mode. For restoring material use <code class="code">reproduction</code> mode, otherwise
- use <code class="code">production</code> mode. Default is <code class="code">reproduction</code> mode.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set filter type. Selects medium. Can be one of the following:
- </p>
- <dl class="table">
- <dt><samp class="option">col</samp></dt>
- <dd><p>select Columbia.
- </p></dd>
- <dt><samp class="option">emi</samp></dt>
- <dd><p>select EMI.
- </p></dd>
- <dt><samp class="option">bsi</samp></dt>
- <dd><p>select BSI (78RPM).
- </p></dd>
- <dt><samp class="option">riaa</samp></dt>
- <dd><p>select RIAA.
- </p></dd>
- <dt><samp class="option">cd</samp></dt>
- <dd><p>select Compact Disc (CD).
- </p></dd>
- <dt><samp class="option">50fm</samp></dt>
- <dd><p>select 50µs (FM).
- </p></dd>
- <dt><samp class="option">75fm</samp></dt>
- <dd><p>select 75µs (FM).
- </p></dd>
- <dt><samp class="option">50kf</samp></dt>
- <dd><p>select 50µs (FM-KF).
- </p></dd>
- <dt><samp class="option">75kf</samp></dt>
- <dd><p>select 75µs (FM-KF).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-6"></a>
- <h4 class="subsection">36.19.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-6" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-6" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="aeval"></a>
- <h3 class="section">36.20 aeval<span class="pull-right"><a class="anchor hidden-xs" href="#aeval" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aeval" aria-hidden="true">TOC</a></span></h3>
- <p>Modify an audio signal according to the specified expressions.
- </p>
- <p>This filter accepts one or more expressions (one for each channel),
- which are evaluated and used to modify a corresponding audio signal.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">exprs</samp></dt>
- <dd><p>Set the ’|’-separated expressions list for each separate channel. If
- the number of input channels is greater than the number of
- expressions, the last specified expression is used for the remaining
- output channels.
- </p>
- </dd>
- <dt><samp class="option">channel_layout, c</samp></dt>
- <dd><p>Set output channel layout. If not specified, the channel layout is
- specified by the number of expressions. If set to ‘<samp class="samp">same</samp>’, it will
- use by default the same input channel layout.
- </p></dd>
- </dl>
- <p>Each expression in <var class="var">exprs</var> can contain the following constants and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">ch</samp></dt>
- <dd><p>channel number of the current expression
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>number of the evaluated sample, starting from 0
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>sample rate
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>time of the evaluated sample expressed in seconds
- </p>
- </dd>
- <dt><samp class="option">nb_in_channels</samp></dt>
- <dt><samp class="option">nb_out_channels</samp></dt>
- <dd><p>input and output number of channels
- </p>
- </dd>
- <dt><samp class="option">val(CH)</samp></dt>
- <dd><p>the value of input channel with number <var class="var">CH</var>
- </p></dd>
- </dl>
- <p>Note: this filter is slow. For faster processing you should use a
- dedicated filter.
- </p>
- <a name="Examples-50"></a>
- <h4 class="subsection">36.20.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-50" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-50" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Half volume:
- <div class="example">
- <pre class="example-preformatted">aeval=val(ch)/2:c=same
- </pre></div>
- </li><li>Invert phase of the second channel:
- <div class="example">
- <pre class="example-preformatted">aeval=val(0)|-val(1)
- </pre></div>
- </li></ul>
- <a name="aexciter"></a>
- <h3 class="section">36.21 aexciter<span class="pull-right"><a class="anchor hidden-xs" href="#aexciter" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aexciter" aria-hidden="true">TOC</a></span></h3>
- <p>An exciter is used to produce high sound that is not present in the
- original signal. This is done by creating harmonic distortions of the
- signal which are restricted in range and added to the original signal.
- An Exciter raises the upper end of an audio signal without simply raising
- the higher frequencies like an equalizer would do to create a more
- "crisp" or "brilliant" sound.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input level prior processing of signal.
- Allowed range is from 0 to 64.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output level after processing of signal.
- Allowed range is from 0 to 64.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">amount</samp></dt>
- <dd><p>Set the amount of harmonics added to original signal.
- Allowed range is from 0 to 64.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">drive</samp></dt>
- <dd><p>Set the amount of newly created harmonics.
- Allowed range is from 0.1 to 10.
- Default value is 8.5.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Set the octave of newly created harmonics.
- Allowed range is from -10 to 10.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">freq</samp></dt>
- <dd><p>Set the lower frequency limit of producing harmonics in Hz.
- Allowed range is from 2000 to 12000 Hz.
- Default is 7500 Hz.
- </p>
- </dd>
- <dt><samp class="option">ceil</samp></dt>
- <dd><p>Set the upper frequency limit of producing harmonics.
- Allowed range is from 9999 to 20000 Hz.
- If value is lower than 10000 Hz no limit is applied.
- </p>
- </dd>
- <dt><samp class="option">listen</samp></dt>
- <dd><p>Mute the original signal and output only added harmonics.
- By default is disabled.
- </p></dd>
- </dl>
- <a name="Commands-7"></a>
- <h4 class="subsection">36.21.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-7" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a class="anchor" id="afade"></a><a name="afade-1"></a>
- <h3 class="section">36.22 afade<span class="pull-right"><a class="anchor hidden-xs" href="#afade-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afade-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply fade-in/out effect to input audio.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">type, t</samp></dt>
- <dd><p>Specify the effect type, can be either <code class="code">in</code> for fade-in, or
- <code class="code">out</code> for a fade-out effect. Default is <code class="code">in</code>.
- </p>
- </dd>
- <dt><samp class="option">start_sample, ss</samp></dt>
- <dd><p>Specify the number of the start sample for starting to apply the fade
- effect. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, ns</samp></dt>
- <dd><p>Specify the number of samples for which the fade effect has to last. At
- the end of the fade-in effect the output audio will have the same
- volume as the input audio, at the end of the fade-out transition
- the output audio will be silence. Default is 44100.
- </p>
- </dd>
- <dt><samp class="option">start_time, st</samp></dt>
- <dd><p>Specify the start time of the fade effect. Default is 0.
- The value must be specified as a time duration; see
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- If set this option is used instead of <var class="var">start_sample</var>.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Specify the duration of the fade effect. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- At the end of the fade-in effect the output audio will have the same
- volume as the input audio, at the end of the fade-out transition
- the output audio will be silence.
- By default the duration is determined by <var class="var">nb_samples</var>.
- If set this option is used instead of <var class="var">nb_samples</var>.
- </p>
- </dd>
- <dt><samp class="option">curve</samp></dt>
- <dd><p>Set curve for fade transition.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">tri</samp></dt>
- <dd><p>select triangular, linear slope (default)
- </p></dd>
- <dt><samp class="option">qsin</samp></dt>
- <dd><p>select quarter of sine wave
- </p></dd>
- <dt><samp class="option">hsin</samp></dt>
- <dd><p>select half of sine wave
- </p></dd>
- <dt><samp class="option">esin</samp></dt>
- <dd><p>select exponential sine wave
- </p></dd>
- <dt><samp class="option">log</samp></dt>
- <dd><p>select logarithmic
- </p></dd>
- <dt><samp class="option">ipar</samp></dt>
- <dd><p>select inverted parabola
- </p></dd>
- <dt><samp class="option">qua</samp></dt>
- <dd><p>select quadratic
- </p></dd>
- <dt><samp class="option">cub</samp></dt>
- <dd><p>select cubic
- </p></dd>
- <dt><samp class="option">squ</samp></dt>
- <dd><p>select square root
- </p></dd>
- <dt><samp class="option">cbr</samp></dt>
- <dd><p>select cubic root
- </p></dd>
- <dt><samp class="option">par</samp></dt>
- <dd><p>select parabola
- </p></dd>
- <dt><samp class="option">exp</samp></dt>
- <dd><p>select exponential
- </p></dd>
- <dt><samp class="option">iqsin</samp></dt>
- <dd><p>select inverted quarter of sine wave
- </p></dd>
- <dt><samp class="option">ihsin</samp></dt>
- <dd><p>select inverted half of sine wave
- </p></dd>
- <dt><samp class="option">dese</samp></dt>
- <dd><p>select double-exponential seat
- </p></dd>
- <dt><samp class="option">desi</samp></dt>
- <dd><p>select double-exponential sigmoid
- </p></dd>
- <dt><samp class="option">losi</samp></dt>
- <dd><p>select logistic sigmoid
- </p></dd>
- <dt><samp class="option">sinc</samp></dt>
- <dd><p>select sine cardinal function
- </p></dd>
- <dt><samp class="option">isinc</samp></dt>
- <dd><p>select inverted sine cardinal function
- </p></dd>
- <dt><samp class="option">quat</samp></dt>
- <dd><p>select quartic
- </p></dd>
- <dt><samp class="option">quatr</samp></dt>
- <dd><p>select quartic root
- </p></dd>
- <dt><samp class="option">qsin2</samp></dt>
- <dd><p>select squared quarter of sine wave
- </p></dd>
- <dt><samp class="option">hsin2</samp></dt>
- <dd><p>select squared half of sine wave
- </p></dd>
- <dt><samp class="option">nofade</samp></dt>
- <dd><p>no fade applied
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">silence</samp></dt>
- <dd><p>Set the initial gain for fade-in or final gain for fade-out.
- Default value is <code class="code">0.0</code>.
- </p>
- </dd>
- <dt><samp class="option">unity</samp></dt>
- <dd><p>Set the initial gain for fade-out or final gain for fade-in.
- Default value is <code class="code">1.0</code>.
- </p></dd>
- </dl>
- <a name="Commands-8"></a>
- <h4 class="subsection">36.22.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-8" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-8" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-51"></a>
- <h4 class="subsection">36.22.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-51" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-51" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Fade in first 15 seconds of audio:
- <div class="example">
- <pre class="example-preformatted">afade=t=in:ss=0:d=15
- </pre></div>
- </li><li>Fade out last 25 seconds of a 900 seconds audio:
- <div class="example">
- <pre class="example-preformatted">afade=t=out:st=875:d=25
- </pre></div>
- </li></ul>
- <a name="afftdn"></a>
- <h3 class="section">36.23 afftdn<span class="pull-right"><a class="anchor hidden-xs" href="#afftdn" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afftdn" aria-hidden="true">TOC</a></span></h3>
- <p>Denoise audio samples with FFT.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">noise_reduction, nr</samp></dt>
- <dd><p>Set the noise reduction in dB, allowed range is 0.01 to 97.
- Default value is 12 dB.
- </p>
- </dd>
- <dt><samp class="option">noise_floor, nf</samp></dt>
- <dd><p>Set the noise floor in dB, allowed range is -80 to -20.
- Default value is -50 dB.
- </p>
- </dd>
- <dt><samp class="option">noise_type, nt</samp></dt>
- <dd><p>Set the noise type.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">white, w</samp></dt>
- <dd><p>Select white noise.
- </p>
- </dd>
- <dt><samp class="option">vinyl, v</samp></dt>
- <dd><p>Select vinyl noise.
- </p>
- </dd>
- <dt><samp class="option">shellac, s</samp></dt>
- <dd><p>Select shellac noise.
- </p>
- </dd>
- <dt><samp class="option">custom, c</samp></dt>
- <dd><p>Select custom noise, defined in <code class="code">bn</code> option.
- </p>
- <p>Default value is white noise.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">band_noise, bn</samp></dt>
- <dd><p>Set custom band noise profile for every one of 15 bands.
- Bands are separated by ’ ’ or ’|’.
- </p>
- </dd>
- <dt><samp class="option">residual_floor, rf</samp></dt>
- <dd><p>Set the residual floor in dB, allowed range is -80 to -20.
- Default value is -38 dB.
- </p>
- </dd>
- <dt><samp class="option">track_noise, tn</samp></dt>
- <dd><p>Enable noise floor tracking. By default is disabled.
- With this enabled, noise floor is automatically adjusted.
- </p>
- </dd>
- <dt><samp class="option">track_residual, tr</samp></dt>
- <dd><p>Enable residual tracking. By default is disabled.
- </p>
- </dd>
- <dt><samp class="option">output_mode, om</samp></dt>
- <dd><p>Set the output mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">input, i</samp></dt>
- <dd><p>Pass input unchanged.
- </p>
- </dd>
- <dt><samp class="option">output, o</samp></dt>
- <dd><p>Pass noise filtered out.
- </p>
- </dd>
- <dt><samp class="option">noise, n</samp></dt>
- <dd><p>Pass only noise.
- </p>
- <p>Default value is <var class="var">output</var>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">adaptivity, ad</samp></dt>
- <dd><p>Set the adaptivity factor, used how fast to adapt gains adjustments per
- each frequency bin. Value <var class="var">0</var> enables instant adaptation, while higher values
- react much slower.
- Allowed range is from <var class="var">0</var> to <var class="var">1</var>. Default value is <var class="var">0.5</var>.
- </p>
- </dd>
- <dt><samp class="option">floor_offset, fo</samp></dt>
- <dd><p>Set the noise floor offset factor. This option is used to adjust offset applied to measured
- noise floor. It is only effective when noise floor tracking is enabled.
- Allowed range is from <var class="var">-2.0</var> to <var class="var">2.0</var>. Default value is <var class="var">1.0</var>.
- </p>
- </dd>
- <dt><samp class="option">noise_link, nl</samp></dt>
- <dd><p>Set the noise link used for multichannel audio.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>Use unchanged channel’s noise floor.
- </p>
- </dd>
- <dt><samp class="option">min</samp></dt>
- <dd><p>Use measured min noise floor of all channels.
- </p>
- </dd>
- <dt><samp class="option">max</samp></dt>
- <dd><p>Use measured max noise floor of all channels.
- </p>
- </dd>
- <dt><samp class="option">average</samp></dt>
- <dd><p>Use measured average noise floor of all channels.
- </p>
- <p>Default value is <var class="var">min</var>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">band_multiplier, bm</samp></dt>
- <dd><p>Set the band multiplier factor, used how much to spread bands across frequency bins.
- Allowed range is from <var class="var">0.2</var> to <var class="var">5</var>. Default value is <var class="var">1.25</var>.
- </p>
- </dd>
- <dt><samp class="option">sample_noise, sn</samp></dt>
- <dd><p>Toggle capturing and measurement of noise profile from input audio.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">start, begin</samp></dt>
- <dd><p>Start sample noise capture.
- </p>
- </dd>
- <dt><samp class="option">stop, end</samp></dt>
- <dd><p>Stop sample noise capture and measure new noise band profile.
- </p>
- <p>Default value is <code class="code">none</code>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">gain_smooth, gs</samp></dt>
- <dd><p>Set gain smooth spatial radius, used to smooth gains applied to each frequency bin.
- Useful to reduce random music noise artefacts.
- Higher values increases smoothing of gains.
- Allowed range is from <code class="code">0</code> to <code class="code">50</code>.
- Default value is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="Commands-9"></a>
- <h4 class="subsection">36.23.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-9" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-9" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the some above mentioned options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-52"></a>
- <h4 class="subsection">36.23.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-52" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-52" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Reduce white noise by 10dB, and use previously measured noise floor of -40dB:
- <div class="example">
- <pre class="example-preformatted">afftdn=nr=10:nf=-40
- </pre></div>
- </li><li>Reduce white noise by 10dB, also set initial noise floor to -80dB and enable automatic
- tracking of noise floor so noise floor will gradually change during processing:
- <div class="example">
- <pre class="example-preformatted">afftdn=nr=10:nf=-80:tn=1
- </pre></div>
- </li><li>Reduce noise by 20dB, using noise floor of -40dB and using commands to take noise profile
- of first 0.4 seconds of input audio:
- <div class="example">
- <pre class="example-preformatted">asendcmd=0.0 afftdn sn start,asendcmd=0.4 afftdn sn stop,afftdn=nr=20:nf=-40
- </pre></div>
- </li></ul>
- <a name="afftfilt"></a>
- <h3 class="section">36.24 afftfilt<span class="pull-right"><a class="anchor hidden-xs" href="#afftfilt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afftfilt" aria-hidden="true">TOC</a></span></h3>
- <p>Apply arbitrary expressions to samples in frequency domain.
- </p>
- <dl class="table">
- <dt><samp class="option">real</samp></dt>
- <dd><p>Set frequency domain real expression for each separate channel separated
- by ’|’. Default is "re".
- If the number of input channels is greater than the number of
- expressions, the last specified expression is used for the remaining
- output channels.
- </p>
- </dd>
- <dt><samp class="option">imag</samp></dt>
- <dd><p>Set frequency domain imaginary expression for each separate channel
- separated by ’|’. Default is "im".
- </p>
- <p>Each expression in <var class="var">real</var> and <var class="var">imag</var> can contain the following
- constants and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">sr</samp></dt>
- <dd><p>sample rate
- </p>
- </dd>
- <dt><samp class="option">b</samp></dt>
- <dd><p>current frequency bin number
- </p>
- </dd>
- <dt><samp class="option">nb</samp></dt>
- <dd><p>number of available bins
- </p>
- </dd>
- <dt><samp class="option">ch</samp></dt>
- <dd><p>channel number of the current expression
- </p>
- </dd>
- <dt><samp class="option">chs</samp></dt>
- <dd><p>number of channels
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>current frame pts
- </p>
- </dd>
- <dt><samp class="option">re</samp></dt>
- <dd><p>current real part of frequency bin of current channel
- </p>
- </dd>
- <dt><samp class="option">im</samp></dt>
- <dd><p>current imaginary part of frequency bin of current channel
- </p>
- </dd>
- <dt><samp class="option">real(b, ch)</samp></dt>
- <dd><p>Return the value of real part of frequency bin at location (<var class="var">bin</var>,<var class="var">channel</var>)
- </p>
- </dd>
- <dt><samp class="option">imag(b, ch)</samp></dt>
- <dd><p>Return the value of imaginary part of frequency bin at location (<var class="var">bin</var>,<var class="var">channel</var>)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">win_size</samp></dt>
- <dd><p>Set window size. Allowed range is from 16 to 131072.
- Default is <code class="code">4096</code>
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hann, hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default is <code class="code">hann</code>.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set window overlap. If set to 1, the recommended overlap for selected
- window function will be picked. Default is <code class="code">0.75</code>.
- </p></dd>
- </dl>
- <a name="Examples-53"></a>
- <h4 class="subsection">36.24.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-53" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-53" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Leave almost only low frequencies in audio:
- <div class="example">
- <pre class="example-preformatted">afftfilt="'real=re * (1-clip((b/nb)*b,0,1))':imag='im * (1-clip((b/nb)*b,0,1))'"
- </pre></div>
- </li><li>Apply robotize effect:
- <div class="example">
- <pre class="example-preformatted">afftfilt="real='hypot(re,im)*sin(0)':imag='hypot(re,im)*cos(0)':win_size=512:overlap=0.75"
- </pre></div>
- </li><li>Apply whisper effect:
- <div class="example">
- <pre class="example-preformatted">afftfilt="real='hypot(re,im)*cos((random(0)*2-1)*2*3.14)':imag='hypot(re,im)*sin((random(1)*2-1)*2*3.14)':win_size=128:overlap=0.8"
- </pre></div>
- </li><li>Apply phase shift:
- <div class="example">
- <pre class="example-preformatted">afftfilt="real=re*cos(1)-im*sin(1):imag=re*sin(1)+im*cos(1)"
- </pre></div>
- </li></ul>
- <a class="anchor" id="afir"></a><a name="afir-1"></a>
- <h3 class="section">36.25 afir<span class="pull-right"><a class="anchor hidden-xs" href="#afir-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afir-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply an arbitrary Finite Impulse Response filter.
- </p>
- <p>This filter is designed for applying long FIR filters,
- up to 60 seconds long.
- </p>
- <p>It can be used as component for digital crossover filters,
- room equalization, cross talk cancellation, wavefield synthesis,
- auralization, ambiophonics, ambisonics and spatialization.
- </p>
- <p>This filter uses the streams higher than first one as FIR coefficients.
- If the non-first stream holds a single channel, it will be used
- for all input channels in the first stream, otherwise
- the number of channels in the non-first stream must be same as
- the number of channels in the first stream.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">dry</samp></dt>
- <dd><p>Set dry gain. This sets input gain.
- </p>
- </dd>
- <dt><samp class="option">wet</samp></dt>
- <dd><p>Set wet gain. This sets final output gain.
- </p>
- </dd>
- <dt><samp class="option">length</samp></dt>
- <dd><p>Set Impulse Response filter length. Default is 1, which means whole IR is processed.
- </p>
- </dd>
- <dt><samp class="option">gtype</samp></dt>
- <dd><p>This option is deprecated, and does nothing.
- </p>
- </dd>
- <dt><samp class="option">irnorm</samp></dt>
- <dd><p>Set norm to be applied to IR coefficients before filtering.
- Allowed range is from <var class="var">-1</var> to <var class="var">2</var>.
- IR coefficients are normalized with calculated vector norm set by this option.
- For negative values, no norm is calculated, and IR coefficients are not modified at all.
- Default is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">irlink</samp></dt>
- <dd><p>For multichannel IR if this option is set to <var class="var">true</var>, all IR channels will be
- normalized with maximal measured gain of all IR channels coefficients as set by <code class="code">irnorm</code> option.
- When disabled, all IR coefficients in each IR channel will be normalized independently.
- Default is <var class="var">true</var>.
- </p>
- </dd>
- <dt><samp class="option">irgain</samp></dt>
- <dd><p>Set gain to be applied to IR coefficients before filtering.
- Allowed range is 0 to 1. This gain is applied after any gain applied with <var class="var">irnorm</var> option.
- </p>
- </dd>
- <dt><samp class="option">irfmt</samp></dt>
- <dd><p>Set format of IR stream. Can be <code class="code">mono</code> or <code class="code">input</code>.
- Default is <code class="code">input</code>.
- </p>
- </dd>
- <dt><samp class="option">maxir</samp></dt>
- <dd><p>Set max allowed Impulse Response filter duration in seconds. Default is 30 seconds.
- Allowed range is 0.1 to 60 seconds.
- </p>
- </dd>
- <dt><samp class="option">response</samp></dt>
- <dd><p>This option is deprecated, and does nothing.
- </p>
- </dd>
- <dt><samp class="option">channel</samp></dt>
- <dd><p>This option is deprecated, and does nothing.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>This option is deprecated, and does nothing.
- </p>
- </dd>
- <dt><samp class="option">rate</samp></dt>
- <dd><p>This option is deprecated, and does nothing.
- </p>
- </dd>
- <dt><samp class="option">minp</samp></dt>
- <dd><p>Set minimal partition size used for convolution. Default is <var class="var">8192</var>.
- Allowed range is from <var class="var">1</var> to <var class="var">65536</var>.
- Lower values decreases latency at cost of higher CPU usage.
- </p>
- </dd>
- <dt><samp class="option">maxp</samp></dt>
- <dd><p>Set maximal partition size used for convolution. Default is <var class="var">8192</var>.
- Allowed range is from <var class="var">8</var> to <var class="var">65536</var>.
- Lower values may increase CPU usage.
- </p>
- </dd>
- <dt><samp class="option">nbirs</samp></dt>
- <dd><p>Set number of input impulse responses streams which will be switchable at runtime.
- Allowed range is from <var class="var">1</var> to <var class="var">32</var>. Default is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">ir</samp></dt>
- <dd><p>Set IR stream which will be used for convolution, starting from <var class="var">0</var>, should always be
- lower than supplied value by <code class="code">nbirs</code> option. Default is <var class="var">0</var>.
- This option can be changed at runtime via <a class="ref" href="#commands">commands</a>.
- </p>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set which precision to use when processing samples.
- </p>
- <dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Auto pick internal sample format depending on other filters.
- </p>
- </dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>Always use single-floating point precision sample format.
- </p>
- </dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>Always use double-floating point precision sample format.
- </p></dd>
- </dl>
- <p>Default value is auto.
- </p>
- </dd>
- <dt><samp class="option">irload</samp></dt>
- <dd><p>Set when to load IR stream. Can be <code class="code">init</code> or <code class="code">access</code>.
- First one load and prepares all IRs on initialization, second one
- once on first access of specific IR.
- Default is <code class="code">init</code>.
- </p></dd>
- </dl>
- <a name="Examples-54"></a>
- <h4 class="subsection">36.25.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-54" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-54" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply reverb to stream using mono IR file as second input, complete command using ffmpeg:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.wav -i middle_tunnel_1way_mono.wav -lavfi afir output.wav
- </pre></div>
- </li><li>Apply true stereo processing given input stereo stream, and two stereo impulse responses for left and right channel,
- the impulse response files are files with names l_ir.wav and r_ir.wav, and setting irnorm option value:
- <div class="example">
- <pre class="example-preformatted">"pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irnorm=1.2,pan=stereo|FL<c0+c2|FR<c1+c3"
- </pre></div>
- </li><li>Similar to above example, but with <code class="code">irgain</code> explicitly set to estimated value and with <code class="code">irnorm</code> disabled:
- <div class="example">
- <pre class="example-preformatted">"pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irgain=-5dB:irnom=-1,pan=stereo|FL<c0+c2|FR<c1+c3"
- </pre></div>
- </li></ul>
- <a class="anchor" id="aformat"></a><a name="aformat-1"></a>
- <h3 class="section">36.26 aformat<span class="pull-right"><a class="anchor hidden-xs" href="#aformat-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aformat-1" aria-hidden="true">TOC</a></span></h3>
- <p>Set output format constraints for the input audio. The framework will
- negotiate the most appropriate format to minimize conversions.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">sample_fmts, f</samp></dt>
- <dd><p>A ’|’-separated list of requested sample formats.
- </p>
- </dd>
- <dt><samp class="option">sample_rates, r</samp></dt>
- <dd><p>A ’|’-separated list of requested sample rates.
- </p>
- </dd>
- <dt><samp class="option">channel_layouts, cl</samp></dt>
- <dd><p>A ’|’-separated list of requested channel layouts.
- </p>
- <p>See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#channel-layout-syntax">the Channel Layout section in the ffmpeg-utils(1) manual</a>
- for the required syntax.
- </p></dd>
- </dl>
- <p>If a parameter is omitted, all values are allowed.
- </p>
- <p>Force the output to either unsigned 8-bit or signed 16-bit stereo
- </p><div class="example">
- <pre class="example-preformatted">aformat=sample_fmts=u8|s16:channel_layouts=stereo
- </pre></div>
- <a name="afreqshift"></a>
- <h3 class="section">36.27 afreqshift<span class="pull-right"><a class="anchor hidden-xs" href="#afreqshift" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afreqshift" aria-hidden="true">TOC</a></span></h3>
- <p>Apply frequency shift to input audio samples.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">shift</samp></dt>
- <dd><p>Specify frequency shift. Allowed range is -INT_MAX to INT_MAX.
- Default value is 0.0.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set output gain applied to final output. Allowed range is from 0.0 to 1.0.
- Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order used for filtering. Allowed range is from 1 to 16.
- Default value is 8.
- </p></dd>
- </dl>
- <a name="Commands-10"></a>
- <h4 class="subsection">36.27.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-10" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-10" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="afwtdn"></a>
- <h3 class="section">36.28 afwtdn<span class="pull-right"><a class="anchor hidden-xs" href="#afwtdn" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afwtdn" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce broadband noise from input samples using Wavelets.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>Set the noise sigma, allowed range is from 0 to 1.
- Default value is 0.
- This option controls strength of denoising applied to input samples.
- Most useful way to set this option is via decibels, eg. -45dB.
- </p>
- </dd>
- <dt><samp class="option">levels</samp></dt>
- <dd><p>Set the number of wavelet levels of decomposition.
- Allowed range is from 1 to 12.
- Default value is 10.
- Setting this too low make denoising performance very poor.
- </p>
- </dd>
- <dt><samp class="option">wavet</samp></dt>
- <dd><p>Set wavelet type for decomposition of input frame.
- They are sorted by number of coefficients, from lowest to highest.
- More coefficients means worse filtering speed, but overall better quality.
- Available wavelets are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">sym2</samp>’</dt>
- <dt>‘<samp class="samp">sym4</samp>’</dt>
- <dt>‘<samp class="samp">rbior68</samp>’</dt>
- <dt>‘<samp class="samp">deb10</samp>’</dt>
- <dt>‘<samp class="samp">sym10</samp>’</dt>
- <dt>‘<samp class="samp">coif5</samp>’</dt>
- <dt>‘<samp class="samp">bl3</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">percent</samp></dt>
- <dd><p>Set percent of full denoising. Allowed range is from 0 to 100 percent.
- Default value is 85 percent or partial denoising.
- </p>
- </dd>
- <dt><samp class="option">profile</samp></dt>
- <dd><p>If enabled, first input frame will be used as noise profile.
- If first frame samples contain non-noise performance will be very poor.
- </p>
- </dd>
- <dt><samp class="option">adaptive</samp></dt>
- <dd><p>If enabled, input frames are analyzed for presence of noise.
- If noise is detected with high possibility then input frame profile will be
- used for processing following frames, until new noise frame is detected.
- </p>
- </dd>
- <dt><samp class="option">samples</samp></dt>
- <dd><p>Set size of single frame in number of samples. Allowed range is from 512 to
- 65536. Default frame size is 8192 samples.
- </p>
- </dd>
- <dt><samp class="option">softness</samp></dt>
- <dd><p>Set softness applied inside thresholding function. Allowed range is from 0 to
- 10. Default softness is 1.
- </p></dd>
- </dl>
- <a name="Commands-11"></a>
- <h4 class="subsection">36.28.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-11" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-11" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="agate"></a>
- <h3 class="section">36.29 agate<span class="pull-right"><a class="anchor hidden-xs" href="#agate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-agate" aria-hidden="true">TOC</a></span></h3>
- <p>A gate is mainly used to reduce lower parts of a signal. This kind of signal
- processing reduces disturbing noise between useful signals.
- </p>
- <p>Gating is done by detecting the volume below a chosen level <var class="var">threshold</var>
- and dividing it by the factor set with <var class="var">ratio</var>. The bottom of the noise
- floor is set via <var class="var">range</var>. Because an exact manipulation of the signal
- would cause distortion of the waveform the reduction can be levelled over
- time. This is done by setting <var class="var">attack</var> and <var class="var">release</var>.
- </p>
- <p><var class="var">attack</var> determines how long the signal has to fall below the threshold
- before any reduction will occur and <var class="var">release</var> sets the time the signal
- has to rise above the threshold to reduce the reduction again.
- Shorter signals than the chosen attack time will be left untouched.
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input level before filtering.
- Default is 1. Allowed range is from 0.015625 to 64.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the mode of operation. Can be <code class="code">upward</code> or <code class="code">downward</code>.
- Default is <code class="code">downward</code>. If set to <code class="code">upward</code> mode, higher parts of signal
- will be amplified, expanding dynamic range in upward direction.
- Otherwise, in case of <code class="code">downward</code> lower parts of signal will be reduced.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Set the level of gain reduction when the signal is below the threshold.
- Default is 0.06125. Allowed range is from 0 to 1.
- Setting this to 0 disables reduction and then filter behaves like expander.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>If a signal rises above this level the gain reduction is released.
- Default is 0.125. Allowed range is from 0 to 1.
- </p>
- </dd>
- <dt><samp class="option">ratio</samp></dt>
- <dd><p>Set a ratio by which the signal is reduced.
- Default is 2. Allowed range is from 1 to 9000.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Amount of milliseconds the signal has to rise above the threshold before gain
- reduction stops.
- Default is 20 milliseconds. Allowed range is from 0.01 to 9000.
- </p>
- </dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Amount of milliseconds the signal has to fall below the threshold before the
- reduction is increased again. Default is 250 milliseconds.
- Allowed range is from 0.01 to 9000.
- </p>
- </dd>
- <dt><samp class="option">makeup</samp></dt>
- <dd><p>Set amount of amplification of signal after processing.
- Default is 1. Allowed range is from 1 to 64.
- </p>
- </dd>
- <dt><samp class="option">knee</samp></dt>
- <dd><p>Curve the sharp knee around the threshold to enter gain reduction more softly.
- Default is 2.828427125. Allowed range is from 1 to 8.
- </p>
- </dd>
- <dt><samp class="option">detection</samp></dt>
- <dd><p>Choose if exact signal should be taken for detection or an RMS like one.
- Default is <code class="code">rms</code>. Can be <code class="code">peak</code> or <code class="code">rms</code>.
- </p>
- </dd>
- <dt><samp class="option">link</samp></dt>
- <dd><p>Choose if the average level between all channels or the louder channel affects
- the reduction.
- Default is <code class="code">average</code>. Can be <code class="code">average</code> or <code class="code">maximum</code>.
- </p></dd>
- </dl>
- <a name="Commands-12"></a>
- <h4 class="subsection">36.29.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-12" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-12" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="aiir"></a>
- <h3 class="section">36.30 aiir<span class="pull-right"><a class="anchor hidden-xs" href="#aiir" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aiir" aria-hidden="true">TOC</a></span></h3>
- <p>Apply an arbitrary Infinite Impulse Response filter.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">zeros, z</samp></dt>
- <dd><p>Set B/numerator/zeros/reflection coefficients.
- </p>
- </dd>
- <dt><samp class="option">poles, p</samp></dt>
- <dd><p>Set A/denominator/poles/ladder coefficients.
- </p>
- </dd>
- <dt><samp class="option">gains, k</samp></dt>
- <dd><p>Set channels gains.
- </p>
- </dd>
- <dt><samp class="option">dry_gain</samp></dt>
- <dd><p>Set input gain.
- </p>
- </dd>
- <dt><samp class="option">wet_gain</samp></dt>
- <dd><p>Set output gain.
- </p>
- </dd>
- <dt><samp class="option">format, f</samp></dt>
- <dd><p>Set coefficients format.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">ll</samp>’</dt>
- <dd><p>lattice-ladder function
- </p></dd>
- <dt>‘<samp class="samp">sf</samp>’</dt>
- <dd><p>analog transfer function
- </p></dd>
- <dt>‘<samp class="samp">tf</samp>’</dt>
- <dd><p>digital transfer function
- </p></dd>
- <dt>‘<samp class="samp">zp</samp>’</dt>
- <dd><p>Z-plane zeros/poles, cartesian (default)
- </p></dd>
- <dt>‘<samp class="samp">pr</samp>’</dt>
- <dd><p>Z-plane zeros/poles, polar radians
- </p></dd>
- <dt>‘<samp class="samp">pd</samp>’</dt>
- <dd><p>Z-plane zeros/poles, polar degrees
- </p></dd>
- <dt>‘<samp class="samp">sp</samp>’</dt>
- <dd><p>S-plane zeros/poles
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">process, r</samp></dt>
- <dd><p>Set type of processing.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">d</samp>’</dt>
- <dd><p>direct processing
- </p></dd>
- <dt>‘<samp class="samp">s</samp>’</dt>
- <dd><p>serial processing
- </p></dd>
- <dt>‘<samp class="samp">p</samp>’</dt>
- <dd><p>parallel processing
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">precision, e</samp></dt>
- <dd><p>Set filtering precision.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">dbl</samp>’</dt>
- <dd><p>double-precision floating-point (default)
- </p></dd>
- <dt>‘<samp class="samp">flt</samp>’</dt>
- <dd><p>single-precision floating-point
- </p></dd>
- <dt>‘<samp class="samp">i32</samp>’</dt>
- <dd><p>32-bit integers
- </p></dd>
- <dt>‘<samp class="samp">i16</samp>’</dt>
- <dd><p>16-bit integers
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize filter coefficients, by default is enabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">response</samp></dt>
- <dd><p>Show IR frequency response, magnitude(magenta), phase(green) and group delay(yellow) in additional video stream.
- By default it is disabled.
- </p>
- </dd>
- <dt><samp class="option">channel</samp></dt>
- <dd><p>Set for which IR channel to display frequency response. By default is first channel
- displayed. This option is used only when <var class="var">response</var> is enabled.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set video stream size. This option is used only when <var class="var">response</var> is enabled.
- </p></dd>
- </dl>
- <p>Coefficients in <code class="code">tf</code> and <code class="code">sf</code> format are separated by spaces and are in ascending
- order.
- </p>
- <p>Coefficients in <code class="code">zp</code> format are separated by spaces and order of coefficients
- doesn’t matter. Coefficients in <code class="code">zp</code> format are complex numbers with <var class="var">i</var>
- imaginary unit.
- </p>
- <p>Different coefficients and gains can be provided for every channel, in such case
- use ’|’ to separate coefficients or gains. Last provided coefficients will be
- used for all remaining channels.
- </p>
- <a name="Examples-55"></a>
- <h4 class="subsection">36.30.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-55" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-55" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply 2 pole elliptic notch at around 5000Hz for 48000 Hz sample rate:
- <div class="example">
- <pre class="example-preformatted">aiir=k=1:z=7.957584807809675810E-1 -2.575128568908332300 3.674839853930788710 -2.57512875289799137 7.957586296317130880E-1:p=1 -2.86950072432325953 3.63022088054647218 -2.28075678147272232 6.361362326477423500E-1:f=tf:r=d
- </pre></div>
- </li><li>Same as above but in <code class="code">zp</code> format:
- <div class="example">
- <pre class="example-preformatted">aiir=k=0.79575848078096756:z=0.80918701+0.58773007i 0.80918701-0.58773007i 0.80884700+0.58784055i 0.80884700-0.58784055i:p=0.63892345+0.59951235i 0.63892345-0.59951235i 0.79582691+0.44198673i 0.79582691-0.44198673i:f=zp:r=s
- </pre></div>
- </li><li>Apply 3-rd order analog normalized Butterworth low-pass filter, using analog transfer function format:
- <div class="example">
- <pre class="example-preformatted">aiir=z=1.3057 0 0 0:p=1.3057 2.3892 2.1860 1:f=sf:r=d
- </pre></div>
- </li></ul>
- <a name="alimiter"></a>
- <h3 class="section">36.31 alimiter<span class="pull-right"><a class="anchor hidden-xs" href="#alimiter" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alimiter" aria-hidden="true">TOC</a></span></h3>
- <p>The limiter prevents an input signal from rising over a desired threshold.
- This limiter uses lookahead technology to prevent your signal from distorting.
- It means that there is a small delay after the signal is processed. Keep in mind
- that the delay it produces is the attack time you set.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output gain. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">limit</samp></dt>
- <dd><p>Don’t let signals above this level pass the limiter. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>The limiter will reach its attenuation level in this amount of time in
- milliseconds. Default is 5 milliseconds.
- </p>
- </dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Come back from limiting to attenuation 1.0 in this amount of milliseconds.
- Default is 50 milliseconds.
- </p>
- </dd>
- <dt><samp class="option">asc</samp></dt>
- <dd><p>When gain reduction is always needed ASC takes care of releasing to an
- average reduction level rather than reaching a reduction of 0 in the release
- time.
- </p>
- </dd>
- <dt><samp class="option">asc_level</samp></dt>
- <dd><p>Select how much the release time is affected by ASC, 0 means nearly no changes
- in release time while 1 produces higher release times.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Auto level output signal. Default is enabled.
- This normalizes audio back to 0dB if enabled.
- </p>
- </dd>
- <dt><samp class="option">latency</samp></dt>
- <dd><p>Compensate the delay introduced by using the lookahead buffer set with attack
- parameter. Also flush the valid audio data in the lookahead buffer when the
- stream hits EOF.
- </p></dd>
- </dl>
- <p>Depending on picked setting it is recommended to upsample input 2x or 4x times
- with <a class="ref" href="#aresample">aresample</a> before applying this filter.
- </p>
- <a name="allpass"></a>
- <h3 class="section">36.32 allpass<span class="pull-right"><a class="anchor hidden-xs" href="#allpass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-allpass" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a two-pole all-pass filter with central frequency (in Hz)
- <var class="var">frequency</var>, and filter-width <var class="var">width</var>.
- An all-pass filter changes the audio’s frequency to phase relationship
- without changing its frequency to amplitude relationship.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set frequency in Hz.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Specify the band-width of a filter in width_type units.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">order, o</samp></dt>
- <dd><p>Set the filter order, can be 1 or 2. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-13"></a>
- <h4 class="subsection">36.32.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-13" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-13" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change allpass frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change allpass width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change allpass width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change allpass mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="aloop"></a>
- <h3 class="section">36.33 aloop<span class="pull-right"><a class="anchor hidden-xs" href="#aloop" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aloop" aria-hidden="true">TOC</a></span></h3>
- <p>Loop audio samples.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">loop</samp></dt>
- <dd><p>Set the number of loops. Setting this value to -1 will result in infinite loops.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set maximal number of samples. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">start</samp></dt>
- <dd><p>Set first sample of loop. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">time</samp></dt>
- <dd><p>Set the time of loop start in seconds.
- Only used if option named <var class="var">start</var> is set to <code class="code">-1</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="amerge"></a><a name="amerge-1"></a>
- <h3 class="section">36.34 amerge<span class="pull-right"><a class="anchor hidden-xs" href="#amerge-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amerge-1" aria-hidden="true">TOC</a></span></h3>
- <p>Merge two or more audio streams into a single multi-channel stream.
- </p>
- <p>All inputs must have the same sample rate, and format.
- </p>
- <p>If inputs do not have the same duration, the output will stop with the
- shortest.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set the number of inputs. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">layout_mode</samp></dt>
- <dd>
- <p>This option controls how the output channel layout is determined and if the
- audio channels are reordered during merge.
- </p>
- <dl class="table">
- <dt><samp class="option">legacy</samp></dt>
- <dd>
- <p>This is the mode how the filter behaved historically so it is the default.
- </p>
- <p>If the channel layouts of the inputs are known and disjoint, and therefore
- compatible, the channel layout of the output will be set accordingly and the
- channels will be reordered as necessary. If the channel layouts of the inputs
- are not disjoint, some of them are unknown, or they are using special channel
- layouts, such as ambisonics, the output will have all the channels of the first
- input then all the channels of the second input, in that order, and the channel
- layout of the output will be the default value corresponding to the total
- number of channels.
- </p>
- <p>For example, if the first input is in 2.1 (FL+FR+LF) and the second input
- is FC+BL+BR, then the output will be in 5.1, with the channels in the
- following order: a1, a2, b1, a3, b2, b3 (a1 is the first channel of the
- first input, b1 is the first channel of the second input).
- </p>
- <p>On the other hand, if both input are in stereo, the output channels will be
- in the default order: a1, a2, b1, b2, and the channel layout will be
- arbitrarily set to 4.0, which may or may not be the expected value.
- </p>
- </dd>
- <dt><samp class="option">reset</samp></dt>
- <dd><p>This mode ignores the input channel layouts and does no channel reordering.
- The output will have all the channels of the first input, then all the channels
- of the second input, in that order, and so on.
- </p>
- <p>The output channel layout will only specify the total channel count.
- </p>
- </dd>
- <dt><samp class="option">normal</samp></dt>
- <dd><p>This mode keeps channel name and designation information from the input
- channels and does no channel reordering. The output will have all the channels
- of the first input, then all the channels of the second input, in that order,
- and so on.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-56"></a>
- <h4 class="subsection">36.34.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-56" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-56" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Merge two mono files into a stereo stream:
- <div class="example">
- <pre class="example-preformatted">amovie=left.wav [l] ; amovie=right.mp3 [r] ; [l] [r] amerge
- </pre></div>
- </li><li>Multiple merges assuming 1 video stream and 6 audio streams in <samp class="file">input.mkv</samp>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv -filter_complex "[0:1][0:2][0:3][0:4][0:5][0:6] amerge=inputs=6" -c:a pcm_s16le output.mkv
- </pre></div>
- </li></ul>
- <a name="amix"></a>
- <h3 class="section">36.35 amix<span class="pull-right"><a class="anchor hidden-xs" href="#amix" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amix" aria-hidden="true">TOC</a></span></h3>
- <p>Mixes multiple audio inputs into a single output.
- </p>
- <p>Note that this filter only supports float samples (the <var class="var">amerge</var>
- and <var class="var">pan</var> audio filters support many formats). If the <var class="var">amix</var>
- input has integer samples then <a class="ref" href="#aresample">aresample</a> will be automatically
- inserted to perform the conversion to float samples.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>The number of inputs. If unspecified, it defaults to 2.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>How to determine the end-of-stream.
- </p><dl class="table">
- <dt><samp class="option">longest</samp></dt>
- <dd><p>The duration of the longest input. (default)
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>The duration of the shortest input.
- </p>
- </dd>
- <dt><samp class="option">first</samp></dt>
- <dd><p>The duration of the first input.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">dropout_transition</samp></dt>
- <dd><p>The transition time, in seconds, for volume renormalization when an input
- stream ends. The default value is 2 seconds.
- </p>
- </dd>
- <dt><samp class="option">weights</samp></dt>
- <dd><p>Specify weight of each input audio stream as a sequence of numbers separated
- by a space. If fewer weights are specified compared to number of inputs, the
- last weight is assigned to the remaining inputs.
- Default weight for each input is 1.
- </p>
- </dd>
- <dt><samp class="option">normalize</samp></dt>
- <dd><p>Always scale inputs instead of only doing summation of samples.
- Beware of heavy clipping if inputs are not normalized prior or after filtering
- by this filter if this option is disabled. By default is enabled.
- </p></dd>
- </dl>
- <a name="Examples-57"></a>
- <h4 class="subsection">36.35.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-57" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-57" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>This will mix 3 input audio streams to a single output with the same duration as the
- first input and a dropout transition time of 3 seconds:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix=inputs=3:duration=first:dropout_transition=3 OUTPUT
- </pre></div>
- </li><li>This will mix one vocal and one music input audio stream to a single output with the same duration as the
- longest input. The music will have quarter the weight as the vocals, and the inputs are not normalized:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i VOCALS -i MUSIC -filter_complex amix=inputs=2:duration=longest:dropout_transition=0:weights="1 0.25":normalize=0 OUTPUT
- </pre></div>
- </li></ul>
- <a name="Commands-14"></a>
- <h4 class="subsection">36.35.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-14" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-14" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">weights</samp></dt>
- <dt><samp class="option">normalize</samp></dt>
- <dd><p>Syntax is same as option with same name.
- </p></dd>
- </dl>
- <a name="amultiply"></a>
- <h3 class="section">36.36 amultiply<span class="pull-right"><a class="anchor hidden-xs" href="#amultiply" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amultiply" aria-hidden="true">TOC</a></span></h3>
- <p>Multiply first audio stream with second audio stream and store result
- in output audio stream. Multiplication is done by multiplying each
- sample from first stream with sample at same position from second stream.
- </p>
- <p>With this element-wise multiplication one can create amplitude fades and
- amplitude modulations.
- </p>
- <a name="anequalizer"></a>
- <h3 class="section">36.37 anequalizer<span class="pull-right"><a class="anchor hidden-xs" href="#anequalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anequalizer" aria-hidden="true">TOC</a></span></h3>
- <p>High-order parametric multiband equalizer for each channel.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">params</samp></dt>
- <dd>
- <p>This option string is in format:
- "c<var class="var">chn</var> f=<var class="var">cf</var> w=<var class="var">w</var> g=<var class="var">g</var> t=<var class="var">f</var> | ..."
- Each equalizer band is separated by ’|’.
- </p>
- <dl class="table">
- <dt><samp class="option">chn</samp></dt>
- <dd><p>Set channel number to which equalization will be applied.
- If input doesn’t have that channel the entry is ignored.
- </p>
- </dd>
- <dt><samp class="option">f</samp></dt>
- <dd><p>Set central frequency for band.
- If input doesn’t have that frequency the entry is ignored.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dd><p>Set band width in Hertz.
- </p>
- </dd>
- <dt><samp class="option">g</samp></dt>
- <dd><p>Set band gain in dB.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>Set filter type for band, optional, can be:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>Butterworth, this is default.
- </p>
- </dd>
- <dt>‘<samp class="samp">1</samp>’</dt>
- <dd><p>Chebyshev type 1.
- </p>
- </dd>
- <dt>‘<samp class="samp">2</samp>’</dt>
- <dd><p>Chebyshev type 2.
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">curves</samp></dt>
- <dd><p>With this option activated frequency response of anequalizer is displayed
- in video stream.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set video stream size. Only useful if curves option is activated.
- </p>
- </dd>
- <dt><samp class="option">mgain</samp></dt>
- <dd><p>Set max gain that will be displayed. Only useful if curves option is activated.
- Setting this to a reasonable value makes it possible to display gain which is derived from
- neighbour bands which are too close to each other and thus produce higher gain
- when both are activated.
- </p>
- </dd>
- <dt><samp class="option">fscale</samp></dt>
- <dd><p>Set frequency scale used to draw frequency response in video output.
- Can be linear or logarithmic. Default is logarithmic.
- </p>
- </dd>
- <dt><samp class="option">colors</samp></dt>
- <dd><p>Set color for each channel curve which is going to be displayed in video stream.
- This is list of color names separated by space or by ’|’.
- Unrecognised or missing colors will be replaced by white color.
- </p></dd>
- </dl>
- <a name="Examples-58"></a>
- <h4 class="subsection">36.37.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-58" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-58" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Lower gain by 10 of central frequency 200Hz and width 100 Hz
- for first 2 channels using Chebyshev type 1 filter:
- <div class="example">
- <pre class="example-preformatted">anequalizer=c0 f=200 w=100 g=-10 t=1|c1 f=200 w=100 g=-10 t=1
- </pre></div>
- </li></ul>
- <a name="Commands-15"></a>
- <h4 class="subsection">36.37.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-15" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-15" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">change</samp></dt>
- <dd><p>Alter existing filter parameters.
- Syntax for the commands is : "<var class="var">fN</var>|f=<var class="var">freq</var>|w=<var class="var">width</var>|g=<var class="var">gain</var>"
- </p>
- <p><var class="var">fN</var> is existing filter number, starting from 0, if no such filter is available
- error is returned.
- <var class="var">freq</var> set new frequency parameter.
- <var class="var">width</var> set new width parameter in Hertz.
- <var class="var">gain</var> set new gain parameter in dB.
- </p>
- <p>Full filter invocation with asendcmd may look like this:
- asendcmd=c=’4.0 anequalizer change 0|f=200|w=50|g=1’,anequalizer=...
- </p></dd>
- </dl>
- <a name="anlmdn"></a>
- <h3 class="section">36.38 anlmdn<span class="pull-right"><a class="anchor hidden-xs" href="#anlmdn" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anlmdn" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce broadband noise in audio samples using Non-Local Means algorithm.
- </p>
- <p>Each sample is adjusted by looking for other samples with similar contexts. This
- context similarity is defined by comparing their surrounding patches of size
- <samp class="option">p</samp>. Patches are searched in an area of <samp class="option">r</samp> around the sample.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">strength, s</samp></dt>
- <dd><p>Set denoising strength. Allowed range is from 0.00001 to 10000. Default value is 0.00001.
- </p>
- </dd>
- <dt><samp class="option">patch, p</samp></dt>
- <dd><p>Set patch radius duration. Allowed range is from 1 to 100 milliseconds.
- Default value is 2 milliseconds.
- </p>
- </dd>
- <dt><samp class="option">research, r</samp></dt>
- <dd><p>Set research radius duration. Allowed range is from 2 to 300 milliseconds.
- Default value is 6 milliseconds.
- </p>
- </dd>
- <dt><samp class="option">output, o</samp></dt>
- <dd><p>Set the output mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Pass input unchanged.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Pass noise filtered out.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Pass only noise.
- </p>
- <p>Default value is <var class="var">o</var>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">smooth, m</samp></dt>
- <dd><p>Set smooth factor. Default value is <var class="var">11</var>. Allowed range is from <var class="var">1</var> to <var class="var">1000</var>.
- </p></dd>
- </dl>
- <a name="Commands-16"></a>
- <h4 class="subsection">36.38.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-16" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-16" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="anlmf_002c-anlms"></a>
- <h3 class="section">36.39 anlmf, anlms<span class="pull-right"><a class="anchor hidden-xs" href="#anlmf_002c-anlms" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anlmf_002c-anlms" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Normalized Least-Mean-(Squares|Fourth) algorithm to the first audio stream using the second audio stream.
- </p>
- <p>This adaptive filter is used to mimic a desired filter by finding the filter coefficients that
- relate to producing the least mean square of the error signal (difference between the desired,
- 2nd input audio stream and the actual signal, the 1st input audio stream).
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order.
- </p>
- </dd>
- <dt><samp class="option">mu</samp></dt>
- <dd><p>Set filter mu.
- </p>
- </dd>
- <dt><samp class="option">eps</samp></dt>
- <dd><p>Set the filter eps.
- </p>
- </dd>
- <dt><samp class="option">leakage</samp></dt>
- <dd><p>Set the filter leakage.
- </p>
- </dd>
- <dt><samp class="option">out_mode</samp></dt>
- <dd><p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Pass the 1st input.
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>Pass the 2nd input.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Pass difference between desired, 2nd input and error signal estimate.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Pass difference between input, 1st input and error signal estimate.
- </p>
- </dd>
- <dt><samp class="option">e</samp></dt>
- <dd><p>Pass error signal estimated samples.
- </p>
- <p>Default value is <var class="var">o</var>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set which precision to use when processing samples.
- </p>
- <dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Auto pick internal sample format depending on other filters.
- </p>
- </dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>Always use single-floating point precision sample format.
- </p>
- </dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>Always use double-floating point precision sample format.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-59"></a>
- <h4 class="subsection">36.39.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-59" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-59" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>One of many usages of this filter is noise reduction, input audio is filtered
- with same samples that are delayed by fixed amount, one such example for stereo audio is:
- <div class="example">
- <pre class="example-preformatted">asplit[a][b],[a]adelay=32S|32S[a],[b][a]anlms=order=128:leakage=0.0005:mu=.5:out_mode=o
- </pre></div>
- </li></ul>
- <a name="Commands-17"></a>
- <h4 class="subsection">36.39.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-17" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-17" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the same commands as options, excluding option <code class="code">order</code>.
- </p>
- <a name="anull"></a>
- <h3 class="section">36.40 anull<span class="pull-right"><a class="anchor hidden-xs" href="#anull" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anull" aria-hidden="true">TOC</a></span></h3>
- <p>Pass the audio source unchanged to the output.
- </p>
- <a name="apad"></a>
- <h3 class="section">36.41 apad<span class="pull-right"><a class="anchor hidden-xs" href="#apad" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apad" aria-hidden="true">TOC</a></span></h3>
- <p>Pad the end of an audio stream with silence.
- </p>
- <p>This can be used together with <code class="command">ffmpeg</code> <samp class="option">-shortest</samp> to
- extend audio streams to the same length as the video stream.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">packet_size</samp></dt>
- <dd><p>Set silence packet size. Default value is 4096.
- </p>
- </dd>
- <dt><samp class="option">pad_len</samp></dt>
- <dd><p>Set the number of samples of silence to add to the end. After the
- value is reached, the stream is terminated. This option is mutually
- exclusive with <samp class="option">whole_len</samp>.
- </p>
- </dd>
- <dt><samp class="option">whole_len</samp></dt>
- <dd><p>Set the minimum total number of samples in the output audio stream. If
- the value is longer than the input audio length, silence is added to
- the end, until the value is reached. This option is mutually exclusive
- with <samp class="option">pad_len</samp>.
- </p>
- </dd>
- <dt><samp class="option">pad_dur</samp></dt>
- <dd><p>Specify the duration of samples of silence to add. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax. Used only if set to non-negative value.
- </p>
- </dd>
- <dt><samp class="option">whole_dur</samp></dt>
- <dd><p>Specify the minimum total duration in the output audio stream. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax. Used only if set to non-negative value. If the value is longer than
- the input audio length, silence is added to the end, until the value is reached.
- This option is mutually exclusive with <samp class="option">pad_dur</samp>
- </p></dd>
- </dl>
- <p>If neither the <samp class="option">pad_len</samp> nor the <samp class="option">whole_len</samp> nor <samp class="option">pad_dur</samp>
- nor <samp class="option">whole_dur</samp> option is set, the filter will add silence to the end of
- the input stream indefinitely.
- </p>
- <p>Note that for ffmpeg 4.4 and earlier a zero <samp class="option">pad_dur</samp> or
- <samp class="option">whole_dur</samp> also caused the filter to add silence indefinitely.
- </p>
- <a name="Examples-60"></a>
- <h4 class="subsection">36.41.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-60" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-60" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Add 1024 samples of silence to the end of the input:
- <div class="example">
- <pre class="example-preformatted">apad=pad_len=1024
- </pre></div>
- </li><li>Make sure the audio output will contain at least 10000 samples, pad
- the input with silence if required:
- <div class="example">
- <pre class="example-preformatted">apad=whole_len=10000
- </pre></div>
- </li><li>Use <code class="command">ffmpeg</code> to pad the audio input with silence, so that the
- video stream will always result the shortest and will be converted
- until the end in the output file when using the <samp class="option">shortest</samp>
- option:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i VIDEO -i AUDIO -filter_complex "[1:0]apad" -shortest OUTPUT
- </pre></div>
- </li></ul>
- <a name="aphaser"></a>
- <h3 class="section">36.42 aphaser<span class="pull-right"><a class="anchor hidden-xs" href="#aphaser" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aphaser" aria-hidden="true">TOC</a></span></h3>
- <p>Add a phasing effect to the input audio.
- </p>
- <p>A phaser filter creates series of peaks and troughs in the frequency spectrum.
- The position of the peaks and troughs are modulated so that they vary over time, creating a sweeping effect.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">in_gain</samp></dt>
- <dd><p>Set input gain. Default is 0.4.
- </p>
- </dd>
- <dt><samp class="option">out_gain</samp></dt>
- <dd><p>Set output gain. Default is 0.74
- </p>
- </dd>
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Set delay in milliseconds. Default is 3.0.
- </p>
- </dd>
- <dt><samp class="option">decay</samp></dt>
- <dd><p>Set decay. Default is 0.4.
- </p>
- </dd>
- <dt><samp class="option">speed</samp></dt>
- <dd><p>Set modulation speed in Hz. Default is 0.5.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set modulation type. Default is triangular.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">triangular, t</samp>’</dt>
- <dt>‘<samp class="samp">sinusoidal, s</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="aphaseshift"></a>
- <h3 class="section">36.43 aphaseshift<span class="pull-right"><a class="anchor hidden-xs" href="#aphaseshift" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aphaseshift" aria-hidden="true">TOC</a></span></h3>
- <p>Apply phase shift to input audio samples.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">shift</samp></dt>
- <dd><p>Specify phase shift. Allowed range is from -1.0 to 1.0.
- Default value is 0.0.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set output gain applied to final output. Allowed range is from 0.0 to 1.0.
- Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order used for filtering. Allowed range is from 1 to 16.
- Default value is 8.
- </p></dd>
- </dl>
- <a name="Commands-18"></a>
- <h4 class="subsection">36.43.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-18" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-18" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="apsnr"></a>
- <h3 class="section">36.44 apsnr<span class="pull-right"><a class="anchor hidden-xs" href="#apsnr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apsnr" aria-hidden="true">TOC</a></span></h3>
- <p>Measure Audio Peak Signal-to-Noise Ratio.
- </p>
- <p>This filter takes two audio streams for input, and outputs first
- audio stream.
- Results are in dB per channel at end of either input.
- </p>
- <a name="apsyclip"></a>
- <h3 class="section">36.45 apsyclip<span class="pull-right"><a class="anchor hidden-xs" href="#apsyclip" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apsyclip" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Psychoacoustic clipper to input audio stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain. By default it is 1. Range is [0.015625 - 64].
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output gain. By default it is 1. Range is [0.015625 - 64].
- </p>
- </dd>
- <dt><samp class="option">clip</samp></dt>
- <dd><p>Set the clipping start value. Default value is 0dBFS or 1.
- </p>
- </dd>
- <dt><samp class="option">diff</samp></dt>
- <dd><p>Output only difference samples, useful to hear introduced distortions.
- By default is disabled.
- </p>
- </dd>
- <dt><samp class="option">adaptive</samp></dt>
- <dd><p>Set strength of adaptive distortion applied. Default value is 0.5.
- Allowed range is from 0 to 1.
- </p>
- </dd>
- <dt><samp class="option">iterations</samp></dt>
- <dd><p>Set number of iterations of psychoacoustic clipper.
- Allowed range is from 1 to 20. Default value is 10.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Auto level output signal. Default is disabled.
- This normalizes audio back to 0dBFS if enabled.
- </p></dd>
- </dl>
- <a name="Commands-19"></a>
- <h4 class="subsection">36.45.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-19" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-19" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="apulsator"></a>
- <h3 class="section">36.46 apulsator<span class="pull-right"><a class="anchor hidden-xs" href="#apulsator" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-apulsator" aria-hidden="true">TOC</a></span></h3>
- <p>Audio pulsator is something between an autopanner and a tremolo.
- But it can produce funny stereo effects as well. Pulsator changes the volume
- of the left and right channel based on a LFO (low frequency oscillator) with
- different waveforms and shifted phases.
- This filter have the ability to define an offset between left and right
- channel. An offset of 0 means that both LFO shapes match each other.
- The left and right channel are altered equally - a conventional tremolo.
- An offset of 50% means that the shape of the right channel is exactly shifted
- in phase (or moved backwards about half of the frequency) - pulsator acts as
- an autopanner. At 1 both curves match again. Every setting in between moves the
- phase shift gapless between all stages and produces some "bypassing" sounds with
- sine and triangle waveforms. The more you set the offset near 1 (starting from
- the 0.5) the faster the signal passes from the left to the right speaker.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain. By default it is 1. Range is [0.015625 - 64].
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output gain. By default it is 1. Range is [0.015625 - 64].
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set waveform shape the LFO will use. Can be one of: sine, triangle, square,
- sawup or sawdown. Default is sine.
- </p>
- </dd>
- <dt><samp class="option">amount</samp></dt>
- <dd><p>Set modulation. Define how much of original signal is affected by the LFO.
- </p>
- </dd>
- <dt><samp class="option">offset_l</samp></dt>
- <dd><p>Set left channel offset. Default is 0. Allowed range is [0 - 1].
- </p>
- </dd>
- <dt><samp class="option">offset_r</samp></dt>
- <dd><p>Set right channel offset. Default is 0.5. Allowed range is [0 - 1].
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>Set pulse width. Default is 1. Allowed range is [0 - 2].
- </p>
- </dd>
- <dt><samp class="option">timing</samp></dt>
- <dd><p>Set possible timing mode. Can be one of: bpm, ms or hz. Default is hz.
- </p>
- </dd>
- <dt><samp class="option">bpm</samp></dt>
- <dd><p>Set bpm. Default is 120. Allowed range is [30 - 300]. Only used if timing
- is set to bpm.
- </p>
- </dd>
- <dt><samp class="option">ms</samp></dt>
- <dd><p>Set ms. Default is 500. Allowed range is [10 - 2000]. Only used if timing
- is set to ms.
- </p>
- </dd>
- <dt><samp class="option">hz</samp></dt>
- <dd><p>Set frequency in Hz. Default is 2. Allowed range is [0.01 - 100]. Only used
- if timing is set to hz.
- </p></dd>
- </dl>
- <a class="anchor" id="aresample"></a><a name="aresample-1"></a>
- <h3 class="section">36.47 aresample<span class="pull-right"><a class="anchor hidden-xs" href="#aresample-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aresample-1" aria-hidden="true">TOC</a></span></h3>
- <p>Resample the input audio to the specified parameters, using the
- libswresample library. If none are specified then the filter will
- automatically convert between its input and output.
- </p>
- <p>This filter is also able to stretch/squeeze the audio data to make it match
- the timestamps or to inject silence / cut out audio to make it match the
- timestamps, do a combination of both or do neither.
- </p>
- <p>The filter accepts the syntax
- [<var class="var">sample_rate</var>:]<var class="var">resampler_options</var>, where <var class="var">sample_rate</var>
- expresses a sample rate and <var class="var">resampler_options</var> is a list of
- <var class="var">key</var>=<var class="var">value</var> pairs, separated by ":". See the
- <a data-manual="ffmpeg-resampler" href="ffmpeg-resampler.html#Resampler-Options">"Resampler Options" section in the
- ffmpeg-resampler(1) manual</a>
- for the complete list of supported options.
- </p>
- <a name="Examples-61"></a>
- <h4 class="subsection">36.47.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-61" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-61" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Resample the input audio to 44100Hz:
- <div class="example">
- <pre class="example-preformatted">aresample=44100
- </pre></div>
- </li><li>Stretch/squeeze samples to the given timestamps, with a maximum of 1000
- samples per second compensation:
- <div class="example">
- <pre class="example-preformatted">aresample=async=1000
- </pre></div>
- </li></ul>
- <a name="areverse"></a>
- <h3 class="section">36.48 areverse<span class="pull-right"><a class="anchor hidden-xs" href="#areverse" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-areverse" aria-hidden="true">TOC</a></span></h3>
- <p>Reverse an audio clip.
- </p>
- <p>Warning: This filter requires memory to buffer the entire clip, so trimming
- is suggested.
- </p>
- <a name="Examples-62"></a>
- <h4 class="subsection">36.48.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-62" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-62" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Take the first 5 seconds of a clip, and reverse it.
- <div class="example">
- <pre class="example-preformatted">atrim=end=5,areverse
- </pre></div>
- </li></ul>
- <a name="arls"></a>
- <h3 class="section">36.49 arls<span class="pull-right"><a class="anchor hidden-xs" href="#arls" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-arls" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Recursive Least Squares algorithm to the first audio stream using the second audio stream.
- </p>
- <p>This adaptive filter is used to mimic a desired filter by recursively finding the filter coefficients that
- relate to producing the minimal weighted linear least squares cost function of the error signal (difference
- between the desired, 2nd input audio stream and the actual signal, the 1st input audio stream).
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set the filter order.
- </p>
- </dd>
- <dt><samp class="option">lambda</samp></dt>
- <dd><p>Set the forgetting factor.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set the coefficient to initialize internal covariance matrix.
- </p>
- </dd>
- <dt><samp class="option">out_mode</samp></dt>
- <dd><p>Set the filter output samples. It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Pass the 1st input.
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>Pass the 2nd input.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Pass difference between desired, 2nd input and error signal estimate.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Pass difference between input, 1st input and error signal estimate.
- </p>
- </dd>
- <dt><samp class="option">e</samp></dt>
- <dd><p>Pass error signal estimated samples.
- </p>
- <p>Default value is <var class="var">o</var>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set which precision to use when processing samples.
- </p>
- <dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Auto pick internal sample format depending on other filters.
- </p>
- </dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>Always use single-floating point precision sample format.
- </p>
- </dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>Always use double-floating point precision sample format.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="arnndn"></a>
- <h3 class="section">36.50 arnndn<span class="pull-right"><a class="anchor hidden-xs" href="#arnndn" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-arnndn" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce noise from speech using Recurrent Neural Networks.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">model, m</samp></dt>
- <dd><p>Set train model file to load. This option is always required.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>Set how much to mix filtered samples into final output.
- Allowed range is from -1 to 1. Default value is 1.
- Negative values are special, they set how much to keep filtered noise
- in the final filter output. Set this option to -1 to hear actual
- noise removed from input signal.
- </p></dd>
- </dl>
- <a name="Commands-20"></a>
- <h4 class="subsection">36.50.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-20" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-20" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="asdr"></a>
- <h3 class="section">36.51 asdr<span class="pull-right"><a class="anchor hidden-xs" href="#asdr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asdr" aria-hidden="true">TOC</a></span></h3>
- <p>Measure Audio Signal-to-Distortion Ratio.
- </p>
- <p>This filter takes two audio streams for input, and outputs first
- audio stream.
- Results are in dB per channel at end of either input.
- </p>
- <a name="asetnsamples"></a>
- <h3 class="section">36.52 asetnsamples<span class="pull-right"><a class="anchor hidden-xs" href="#asetnsamples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asetnsamples" aria-hidden="true">TOC</a></span></h3>
- <p>Set the number of samples per each output audio frame.
- </p>
- <p>The last output packet may contain a different number of samples, as
- the filter will flush all the remaining samples when the input audio
- signals its end.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">nb_out_samples, n</samp></dt>
- <dd><p>Set the number of frames per each output audio frame. The number is
- intended as the number of samples <em class="emph">per each channel</em>.
- Default value is 1024.
- </p>
- </dd>
- <dt><samp class="option">pad, p</samp></dt>
- <dd><p>If set to 1, the filter will pad the last audio frame with zeroes, so
- that the last frame will contain the same number of samples as the
- previous ones. Default value is 1.
- </p></dd>
- </dl>
- <p>For example, to set the number of per-frame samples to 1234 and
- disable padding for the last frame, use:
- </p><div class="example">
- <pre class="example-preformatted">asetnsamples=n=1234:p=0
- </pre></div>
- <a name="asetrate"></a>
- <h3 class="section">36.53 asetrate<span class="pull-right"><a class="anchor hidden-xs" href="#asetrate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asetrate" aria-hidden="true">TOC</a></span></h3>
- <p>Set the sample rate without altering the PCM data.
- This will result in a change of speed and pitch.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Set the output sample rate. Default is 44100 Hz.
- </p></dd>
- </dl>
- <a name="ashowinfo"></a>
- <h3 class="section">36.54 ashowinfo<span class="pull-right"><a class="anchor hidden-xs" href="#ashowinfo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ashowinfo" aria-hidden="true">TOC</a></span></h3>
- <p>Show a line containing various information for each input audio frame.
- The input audio is not modified.
- </p>
- <p>The shown line contains a sequence of key/value pairs of the form
- <var class="var">key</var>:<var class="var">value</var>.
- </p>
- <p>The following values are shown in the output:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>The (sequential) number of the input frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>The presentation timestamp of the input frame, in time base units; the time base
- depends on the filter input pad, and is usually 1/<var class="var">sample_rate</var>.
- </p>
- </dd>
- <dt><samp class="option">pts_time</samp></dt>
- <dd><p>The presentation timestamp of the input frame in seconds.
- </p>
- </dd>
- <dt><samp class="option">fmt</samp></dt>
- <dd><p>The sample format.
- </p>
- </dd>
- <dt><samp class="option">chlayout</samp></dt>
- <dd><p>The channel layout.
- </p>
- </dd>
- <dt><samp class="option">rate</samp></dt>
- <dd><p>The sample rate for the audio frame.
- </p>
- </dd>
- <dt><samp class="option">nb_samples</samp></dt>
- <dd><p>The number of samples (per channel) in the frame.
- </p>
- </dd>
- <dt><samp class="option">checksum</samp></dt>
- <dd><p>The Adler-32 checksum (printed in hexadecimal) of the audio data. For planar
- audio, the data is treated as if all the planes were concatenated.
- </p>
- </dd>
- <dt><samp class="option">plane_checksums</samp></dt>
- <dd><p>A list of Adler-32 checksums for each data plane.
- </p></dd>
- </dl>
- <a name="asisdr"></a>
- <h3 class="section">36.55 asisdr<span class="pull-right"><a class="anchor hidden-xs" href="#asisdr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asisdr" aria-hidden="true">TOC</a></span></h3>
- <p>Measure Audio Scaled-Invariant Signal-to-Distortion Ratio.
- </p>
- <p>This filter takes two audio streams for input, and outputs first
- audio stream.
- Results are in dB per channel at end of either input.
- </p>
- <a name="asoftclip"></a>
- <h3 class="section">36.56 asoftclip<span class="pull-right"><a class="anchor hidden-xs" href="#asoftclip" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asoftclip" aria-hidden="true">TOC</a></span></h3>
- <p>Apply audio soft clipping.
- </p>
- <p>Soft clipping is a type of distortion effect where the amplitude of a signal is saturated
- along a smooth curve, rather than the abrupt shape of hard-clipping.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set type of soft-clipping.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">hard</samp></dt>
- <dt><samp class="option">tanh</samp></dt>
- <dt><samp class="option">atan</samp></dt>
- <dt><samp class="option">cubic</samp></dt>
- <dt><samp class="option">exp</samp></dt>
- <dt><samp class="option">alg</samp></dt>
- <dt><samp class="option">quintic</samp></dt>
- <dt><samp class="option">sin</samp></dt>
- <dt><samp class="option">erf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set threshold from where to start clipping. Default value is 0dB or 1.
- </p>
- </dd>
- <dt><samp class="option">output</samp></dt>
- <dd><p>Set gain applied to output. Default value is 0dB or 1.
- </p>
- </dd>
- <dt><samp class="option">param</samp></dt>
- <dd><p>Set additional parameter which controls sigmoid function.
- </p>
- </dd>
- <dt><samp class="option">oversample</samp></dt>
- <dd><p>Set oversampling factor.
- </p></dd>
- </dl>
- <a name="Commands-21"></a>
- <h4 class="subsection">36.56.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-21" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-21" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="aspectralstats"></a>
- <h3 class="section">36.57 aspectralstats<span class="pull-right"><a class="anchor hidden-xs" href="#aspectralstats" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aspectralstats" aria-hidden="true">TOC</a></span></h3>
- <p>Display frequency domain statistical information about the audio channels.
- Statistics are calculated and stored as metadata for each audio channel and for each audio frame.
- </p>
- <p>It accepts the following option:
- </p><dl class="table">
- <dt><samp class="option">win_size</samp></dt>
- <dd><p>Set the window length in samples. Default value is 2048.
- Allowed range is from 32 to 65536.
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hann, hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default is <code class="code">hann</code>.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set window overlap. Allowed range is from <code class="code">0</code>
- to <code class="code">1</code>. Default value is <code class="code">0.5</code>.
- </p>
- </dd>
- <dt><samp class="option">measure</samp></dt>
- <dd><p>Select the parameters which are measured. The metadata keys can
- be used as flags, default is <samp class="option">all</samp> which measures everything.
- <samp class="option">none</samp> disables all measurement.
- </p></dd>
- </dl>
- <p>A list of each metadata key follows:
- </p>
- <dl class="table">
- <dt><samp class="option">mean</samp></dt>
- <dt><samp class="option">variance</samp></dt>
- <dt><samp class="option">centroid</samp></dt>
- <dt><samp class="option">spread</samp></dt>
- <dt><samp class="option">skewness</samp></dt>
- <dt><samp class="option">kurtosis</samp></dt>
- <dt><samp class="option">entropy</samp></dt>
- <dt><samp class="option">flatness</samp></dt>
- <dt><samp class="option">crest</samp></dt>
- <dt><samp class="option">flux</samp></dt>
- <dt><samp class="option">slope</samp></dt>
- <dt><samp class="option">decrease</samp></dt>
- <dt><samp class="option">rolloff</samp></dt>
- </dl>
- <a name="asr"></a>
- <h3 class="section">36.58 asr<span class="pull-right"><a class="anchor hidden-xs" href="#asr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asr" aria-hidden="true">TOC</a></span></h3>
- <p>Automatic Speech Recognition
- </p>
- <p>This filter uses PocketSphinx for speech recognition. To enable
- compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-pocketsphinx</code>.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rate</samp></dt>
- <dd><p>Set sampling rate of input audio. Defaults is <code class="code">16000</code>.
- This need to match speech models, otherwise one will get poor results.
- </p>
- </dd>
- <dt><samp class="option">hmm</samp></dt>
- <dd><p>Set dictionary containing acoustic model files.
- </p>
- </dd>
- <dt><samp class="option">dict</samp></dt>
- <dd><p>Set pronunciation dictionary.
- </p>
- </dd>
- <dt><samp class="option">lm</samp></dt>
- <dd><p>Set language model file.
- </p>
- </dd>
- <dt><samp class="option">lmctl</samp></dt>
- <dd><p>Set language model set.
- </p>
- </dd>
- <dt><samp class="option">lmname</samp></dt>
- <dd><p>Set which language model to use.
- </p>
- </dd>
- <dt><samp class="option">logfn</samp></dt>
- <dd><p>Set output for log messages.
- </p></dd>
- </dl>
- <p>The filter exports recognized speech as the frame metadata <code class="code">lavfi.asr.text</code>.
- </p>
- <a class="anchor" id="astats"></a><a name="astats-1"></a>
- <h3 class="section">36.59 astats<span class="pull-right"><a class="anchor hidden-xs" href="#astats-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-astats-1" aria-hidden="true">TOC</a></span></h3>
- <p>Display time domain statistical information about the audio channels.
- Statistics are calculated and displayed for each audio channel and,
- where applicable, an overall figure is also given.
- </p>
- <p>It accepts the following option:
- </p><dl class="table">
- <dt><samp class="option">length</samp></dt>
- <dd><p>Short window length in seconds, used for peak and through RMS measurement.
- Default is <code class="code">0.05</code> (50 milliseconds). Allowed range is <code class="code">[0 - 10]</code>.
- </p>
- </dd>
- <dt><samp class="option">metadata</samp></dt>
- <dd>
- <p>Set metadata injection. All the metadata keys are prefixed with <code class="code">lavfi.astats.X</code>,
- where <code class="code">X</code> is channel number starting from 1 or string <code class="code">Overall</code>. Default is
- disabled.
- </p>
- <p>Available keys for each channel are:
- <var class="var">Bit_depth</var>
- <var class="var">Crest_factor</var>
- <var class="var">DC_offset</var>
- <var class="var">Dynamic_range</var>
- <var class="var">Entropy</var>
- <var class="var">Flat_factor</var>
- <var class="var">Max_difference</var>
- <var class="var">Max_level</var>
- <var class="var">Mean_difference</var>
- <var class="var">Min_difference</var>
- <var class="var">Min_level</var>
- <var class="var">Noise_floor</var>
- <var class="var">Noise_floor_count</var>
- <var class="var">Number_of_Infs</var>
- <var class="var">Number_of_NaNs</var>
- <var class="var">Number_of_denormals</var>
- <var class="var">Peak_count</var>
- <var class="var">Abs_Peak_count</var>
- <var class="var">Peak_level</var>
- <var class="var">RMS_difference</var>
- <var class="var">RMS_peak</var>
- <var class="var">RMS_trough</var>
- <var class="var">Zero_crossings</var>
- <var class="var">Zero_crossings_rate</var>
- </p>
- <p>and for <code class="code">Overall</code>:
- <var class="var">Bit_depth</var>
- <var class="var">DC_offset</var>
- <var class="var">Entropy</var>
- <var class="var">Flat_factor</var>
- <var class="var">Max_difference</var>
- <var class="var">Max_level</var>
- <var class="var">Mean_difference</var>
- <var class="var">Min_difference</var>
- <var class="var">Min_level</var>
- <var class="var">Noise_floor</var>
- <var class="var">Noise_floor_count</var>
- <var class="var">Number_of_Infs</var>
- <var class="var">Number_of_NaNs</var>
- <var class="var">Number_of_denormals</var>
- <var class="var">Number_of_samples</var>
- <var class="var">Peak_count</var>
- <var class="var">Abs_Peak_count</var>
- <var class="var">Peak_level</var>
- <var class="var">RMS_difference</var>
- <var class="var">RMS_level</var>
- <var class="var">RMS_peak</var>
- <var class="var">RMS_trough</var>
- </p>
- <p>For example, a full key looks like <code class="code">lavfi.astats.1.DC_offset</code> or
- <code class="code">lavfi.astats.Overall.Peak_count</code>.
- </p>
- <p>Read below for the description of the keys.
- </p>
- </dd>
- <dt><samp class="option">reset</samp></dt>
- <dd><p>Set the number of frames over which cumulative stats are calculated before
- being reset. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">measure_perchannel</samp></dt>
- <dd><p>Select the parameters which are measured per channel. The metadata keys can
- be used as flags, default is <samp class="option">all</samp> which measures everything.
- <samp class="option">none</samp> disables all per channel measurement.
- </p>
- </dd>
- <dt><samp class="option">measure_overall</samp></dt>
- <dd><p>Select the parameters which are measured overall. The metadata keys can
- be used as flags, default is <samp class="option">all</samp> which measures everything.
- <samp class="option">none</samp> disables all overall measurement.
- </p>
- </dd>
- </dl>
- <p>A description of the measure keys follow:
- </p>
- <dl class="table">
- <dt><samp class="option">none</samp></dt>
- <dd><p>no measures
- </p>
- </dd>
- <dt><samp class="option">all</samp></dt>
- <dd><p>all measures
- </p>
- </dd>
- <dt><samp class="option">Bit_depth</samp></dt>
- <dd><p>overall bit depth of audio, i.e. number of bits used for each sample
- </p>
- </dd>
- <dt><samp class="option">Crest_factor</samp></dt>
- <dd><p>standard ratio of peak to RMS level (note: not in dB)
- </p>
- </dd>
- <dt><samp class="option">DC_offset</samp></dt>
- <dd><p>mean amplitude displacement from zero
- </p>
- </dd>
- <dt><samp class="option">Dynamic_range</samp></dt>
- <dd><p>measured dynamic range of audio in dB
- </p>
- </dd>
- <dt><samp class="option">Entropy</samp></dt>
- <dd><p>entropy measured across whole audio, entropy of value near 1.0 is typically measured for white noise
- </p>
- </dd>
- <dt><samp class="option">Flat_factor</samp></dt>
- <dd><p>flatness (i.e. consecutive samples with the same value) of the signal at its peak levels
- (i.e. either <var class="var">Min_level</var> or <var class="var">Max_level</var>)
- </p>
- </dd>
- <dt><samp class="option">Max_difference</samp></dt>
- <dd><p>maximal difference between two consecutive samples
- </p>
- </dd>
- <dt><samp class="option">Max_level</samp></dt>
- <dd><p>maximal sample level
- </p>
- </dd>
- <dt><samp class="option">Mean_difference</samp></dt>
- <dd><p>mean difference between two consecutive samples, i.e. the average of each difference between two consecutive samples
- </p>
- </dd>
- <dt><samp class="option">Min_difference</samp></dt>
- <dd><p>minimal difference between two consecutive samples
- </p>
- </dd>
- <dt><samp class="option">Min_level</samp></dt>
- <dd><p>minimal sample level
- </p>
- </dd>
- <dt><samp class="option">Noise_floor</samp></dt>
- <dd><p>minimum local peak measured in dBFS over a short window
- </p>
- </dd>
- <dt><samp class="option">Noise_floor_count</samp></dt>
- <dd><p>number of occasions (not the number of samples) that the signal attained
- <var class="var">Noise floor</var>
- </p>
- </dd>
- <dt><samp class="option">Number_of_Infs</samp></dt>
- <dd><p>number of samples with an infinite value
- </p>
- </dd>
- <dt><samp class="option">Number_of_NaNs</samp></dt>
- <dd><p>number of samples with a NaN (not a number) value
- </p>
- </dd>
- <dt><samp class="option">Number_of_denormals</samp></dt>
- <dd><p>number of samples with a subnormal value
- </p>
- </dd>
- <dt><samp class="option">Number_of_samples</samp></dt>
- <dd><p>number of samples
- </p>
- </dd>
- <dt><samp class="option">Peak_count</samp></dt>
- <dd><p>number of occasions (not the number of samples) that the signal attained either
- <var class="var">Min_level</var> or <var class="var">Max_level</var>
- </p>
- </dd>
- <dt><samp class="option">Abs_Peak_count</samp></dt>
- <dd><p>number of occasions that the absolute samples taken from the signal attained
- max absolute value of <var class="var">Min_level</var> and <var class="var">Max_level</var>
- </p>
- </dd>
- <dt><samp class="option">Peak_level</samp></dt>
- <dd><p>standard peak level measured in dBFS
- </p>
- </dd>
- <dt><samp class="option">RMS_difference</samp></dt>
- <dd><p>Root Mean Square difference between two consecutive samples
- </p>
- </dd>
- <dt><samp class="option">RMS_level</samp></dt>
- <dd><p>standard RMS level measured in dBFS
- </p>
- </dd>
- <dt><samp class="option">RMS_peak</samp></dt>
- <dt><samp class="option">RMS_trough</samp></dt>
- <dd><p>peak and through values for RMS level measured over a short window,
- measured in dBFS.
- </p>
- </dd>
- <dt><samp class="option">Zero crossings</samp></dt>
- <dd><p>number of points where the waveform crosses the zero level axis
- </p>
- </dd>
- <dt><samp class="option">Zero crossings rate</samp></dt>
- <dd><p>rate of Zero crossings and number of audio samples
- </p></dd>
- </dl>
- <a name="asubboost"></a>
- <h3 class="section">36.60 asubboost<span class="pull-right"><a class="anchor hidden-xs" href="#asubboost" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asubboost" aria-hidden="true">TOC</a></span></h3>
- <p>Boost subwoofer frequencies.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dry</samp></dt>
- <dd><p>Set dry gain, how much of original signal is kept. Allowed range is from 0 to 1.
- Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">wet</samp></dt>
- <dd><p>Set wet gain, how much of filtered signal is kept. Allowed range is from 0 to 1.
- Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">boost</samp></dt>
- <dd><p>Set max boost factor. Allowed range is from 1 to 12. Default value is 2.
- </p>
- </dd>
- <dt><samp class="option">decay</samp></dt>
- <dd><p>Set delay line decay gain value. Allowed range is from 0 to 1.
- Default value is 0.0.
- </p>
- </dd>
- <dt><samp class="option">feedback</samp></dt>
- <dd><p>Set delay line feedback gain value. Allowed range is from 0 to 1.
- Default value is 0.9.
- </p>
- </dd>
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set cutoff frequency in Hertz. Allowed range is 50 to 900.
- Default value is 100.
- </p>
- </dd>
- <dt><samp class="option">slope</samp></dt>
- <dd><p>Set slope amount for cutoff frequency. Allowed range is 0.0001 to 1.
- Default value is 0.5.
- </p>
- </dd>
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Set delay. Allowed range is from 1 to 100.
- Default value is 20.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set the channels to process. Default value is all available.
- </p></dd>
- </dl>
- <a name="Commands-22"></a>
- <h4 class="subsection">36.60.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-22" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-22" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="asubcut"></a>
- <h3 class="section">36.61 asubcut<span class="pull-right"><a class="anchor hidden-xs" href="#asubcut" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asubcut" aria-hidden="true">TOC</a></span></h3>
- <p>Cut subwoofer frequencies.
- </p>
- <p>This filter allows to set custom, steeper
- roll off than highpass filter, and thus is able to more attenuate
- frequency content in stop-band.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set cutoff frequency in Hertz. Allowed range is 2 to 200.
- Default value is 20.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order. Available values are from 3 to 20.
- Default value is 10.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set input gain level. Allowed range is from 0 to 1. Default value is 1.
- </p></dd>
- </dl>
- <a name="Commands-23"></a>
- <h4 class="subsection">36.61.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-23" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-23" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="asupercut"></a>
- <h3 class="section">36.62 asupercut<span class="pull-right"><a class="anchor hidden-xs" href="#asupercut" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asupercut" aria-hidden="true">TOC</a></span></h3>
- <p>Cut super frequencies.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set cutoff frequency in Hertz. Allowed range is 20000 to 192000.
- Default value is 20000.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order. Available values are from 3 to 20.
- Default value is 10.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set input gain level. Allowed range is from 0 to 1. Default value is 1.
- </p></dd>
- </dl>
- <a name="Commands-24"></a>
- <h4 class="subsection">36.62.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-24" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-24" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="asuperpass"></a>
- <h3 class="section">36.63 asuperpass<span class="pull-right"><a class="anchor hidden-xs" href="#asuperpass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asuperpass" aria-hidden="true">TOC</a></span></h3>
- <p>Apply high order Butterworth band-pass filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">centerf</samp></dt>
- <dd><p>Set center frequency in Hertz. Allowed range is 2 to 999999.
- Default value is 1000.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order. Available values are from 4 to 20.
- Default value is 4.
- </p>
- </dd>
- <dt><samp class="option">qfactor</samp></dt>
- <dd><p>Set Q-factor. Allowed range is from 0.01 to 100. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set input gain level. Allowed range is from 0 to 2. Default value is 1.
- </p></dd>
- </dl>
- <a name="Commands-25"></a>
- <h4 class="subsection">36.63.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-25" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-25" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="asuperstop"></a>
- <h3 class="section">36.64 asuperstop<span class="pull-right"><a class="anchor hidden-xs" href="#asuperstop" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-asuperstop" aria-hidden="true">TOC</a></span></h3>
- <p>Apply high order Butterworth band-stop filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">centerf</samp></dt>
- <dd><p>Set center frequency in Hertz. Allowed range is 2 to 999999.
- Default value is 1000.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set filter order. Available values are from 4 to 20.
- Default value is 4.
- </p>
- </dd>
- <dt><samp class="option">qfactor</samp></dt>
- <dd><p>Set Q-factor. Allowed range is from 0.01 to 100. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set input gain level. Allowed range is from 0 to 2. Default value is 1.
- </p></dd>
- </dl>
- <a name="Commands-26"></a>
- <h4 class="subsection">36.64.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-26" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-26" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="atempo"></a>
- <h3 class="section">36.65 atempo<span class="pull-right"><a class="anchor hidden-xs" href="#atempo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-atempo" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust audio tempo.
- </p>
- <p>The filter accepts exactly one parameter, the audio tempo. If not
- specified then the filter will assume nominal 1.0 tempo. Tempo must
- be in the [0.5, 100.0] range.
- </p>
- <p>Note that tempo greater than 2 will skip some samples rather than
- blend them in. If for any reason this is a concern it is always
- possible to daisy-chain several instances of atempo to achieve the
- desired product tempo.
- </p>
- <a name="Examples-63"></a>
- <h4 class="subsection">36.65.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-63" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-63" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Slow down audio to 80% tempo:
- <div class="example">
- <pre class="example-preformatted">atempo=0.8
- </pre></div>
- </li><li>To speed up audio to 300% tempo:
- <div class="example">
- <pre class="example-preformatted">atempo=3
- </pre></div>
- </li><li>To speed up audio to 300% tempo by daisy-chaining two atempo instances:
- <div class="example">
- <pre class="example-preformatted">atempo=sqrt(3),atempo=sqrt(3)
- </pre></div>
- </li></ul>
- <a name="Commands-27"></a>
- <h4 class="subsection">36.65.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-27" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-27" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">tempo</samp></dt>
- <dd><p>Change filter tempo scale factor.
- Syntax for the command is : "<var class="var">tempo</var>"
- </p></dd>
- </dl>
- <a name="atilt"></a>
- <h3 class="section">36.66 atilt<span class="pull-right"><a class="anchor hidden-xs" href="#atilt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-atilt" aria-hidden="true">TOC</a></span></h3>
- <p>Apply spectral tilt filter to audio stream.
- </p>
- <p>This filter apply any spectral roll-off slope over any specified frequency band.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">freq</samp></dt>
- <dd><p>Set central frequency of tilt in Hz. Default is 10000 Hz.
- </p>
- </dd>
- <dt><samp class="option">slope</samp></dt>
- <dd><p>Set slope direction of tilt. Default is 0. Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>Set width of tilt. Default is 1000. Allowed range is from 100 to 10000.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set order of tilt filter.
- </p>
- </dd>
- <dt><samp class="option">level</samp></dt>
- <dd><p>Set input volume level. Allowed range is from 0 to 4.
- Default is 1.
- </p></dd>
- </dl>
- <a name="Commands-28"></a>
- <h4 class="subsection">36.66.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-28" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-28" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="atrim"></a>
- <h3 class="section">36.67 atrim<span class="pull-right"><a class="anchor hidden-xs" href="#atrim" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-atrim" aria-hidden="true">TOC</a></span></h3>
- <p>Trim the input so that the output contains one continuous subpart of the input.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">start</samp></dt>
- <dd><p>Timestamp (in seconds) of the start of the section to keep. I.e. the audio
- sample with the timestamp <var class="var">start</var> will be the first sample in the output.
- </p>
- </dd>
- <dt><samp class="option">end</samp></dt>
- <dd><p>Specify time of the first audio sample that will be dropped, i.e. the
- audio sample immediately preceding the one with the timestamp <var class="var">end</var> will be
- the last sample in the output.
- </p>
- </dd>
- <dt><samp class="option">start_pts</samp></dt>
- <dd><p>Same as <var class="var">start</var>, except this option sets the start timestamp in samples
- instead of seconds.
- </p>
- </dd>
- <dt><samp class="option">end_pts</samp></dt>
- <dd><p>Same as <var class="var">end</var>, except this option sets the end timestamp in samples instead
- of seconds.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>The maximum duration of the output in seconds.
- </p>
- </dd>
- <dt><samp class="option">start_sample</samp></dt>
- <dd><p>The number of the first sample that should be output.
- </p>
- </dd>
- <dt><samp class="option">end_sample</samp></dt>
- <dd><p>The number of the first sample that should be dropped.
- </p></dd>
- </dl>
- <p><samp class="option">start</samp>, <samp class="option">end</samp>, and <samp class="option">duration</samp> are expressed as time
- duration specifications; see
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
- </p>
- <p>Note that the first two sets of the start/end options and the <samp class="option">duration</samp>
- option look at the frame timestamp, while the _sample options simply count the
- samples that pass through the filter. So start/end_pts and start/end_sample will
- give different results when the timestamps are wrong, inexact or do not start at
- zero. Also note that this filter does not modify the timestamps. If you wish
- to have the output timestamps start at zero, insert the asetpts filter after the
- atrim filter.
- </p>
- <p>If multiple start or end options are set, this filter tries to be greedy and
- keep all samples that match at least one of the specified constraints. To keep
- only the part that matches all the constraints at once, chain multiple atrim
- filters.
- </p>
- <p>The defaults are such that all the input is kept. So it is possible to set e.g.
- just the end values to keep everything before the specified time.
- </p>
- <p>Examples:
- </p><ul class="itemize mark-bullet">
- <li>Drop everything except the second minute of input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -af atrim=60:120
- </pre></div>
- </li><li>Keep only the first 1000 samples:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -af atrim=end_sample=1000
- </pre></div>
- </li></ul>
- <a name="axcorrelate"></a>
- <h3 class="section">36.68 axcorrelate<span class="pull-right"><a class="anchor hidden-xs" href="#axcorrelate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-axcorrelate" aria-hidden="true">TOC</a></span></h3>
- <p>Calculate normalized windowed cross-correlation between two input audio streams.
- </p>
- <p>Resulted samples are always between -1 and 1 inclusive.
- If result is 1 it means two input samples are highly correlated in that selected segment.
- Result 0 means they are not correlated at all.
- If result is -1 it means two input samples are out of phase, which means they cancel each
- other.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set size of segment over which cross-correlation is calculated.
- Default is 256. Allowed range is from 2 to 131072.
- </p>
- </dd>
- <dt><samp class="option">algo</samp></dt>
- <dd><p>Set algorithm for cross-correlation. Can be <code class="code">slow</code> or <code class="code">fast</code> or <code class="code">best</code>.
- Default is <code class="code">best</code>. Fast algorithm assumes mean values over any given segment
- are always zero and thus need much less calculations to make.
- This is generally not true, but is valid for typical audio streams.
- </p></dd>
- </dl>
- <a name="Examples-64"></a>
- <h4 class="subsection">36.68.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-64" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-64" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Calculate correlation between channels in stereo audio stream:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i stereo.wav -af channelsplit,axcorrelate=size=1024:algo=fast correlation.wav
- </pre></div>
- </li></ul>
- <a name="bandpass"></a>
- <h3 class="section">36.69 bandpass<span class="pull-right"><a class="anchor hidden-xs" href="#bandpass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bandpass" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a two-pole Butterworth band-pass filter with central
- frequency <var class="var">frequency</var>, and (3dB-point) band-width width.
- The <var class="var">csg</var> option selects a constant skirt gain (peak gain = Q)
- instead of the default: constant 0dB peak gain.
- The filter roll off at 6dB per octave (20dB per decade).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the filter’s central frequency. Default is <code class="code">3000</code>.
- </p>
- </dd>
- <dt><samp class="option">csg</samp></dt>
- <dd><p>Constant skirt gain if set to 1. Defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Specify the band-width of a filter in width_type units.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-29"></a>
- <h4 class="subsection">36.69.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-29" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-29" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change bandpass frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change bandpass width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change bandpass width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change bandpass mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="bandreject"></a>
- <h3 class="section">36.70 bandreject<span class="pull-right"><a class="anchor hidden-xs" href="#bandreject" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bandreject" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a two-pole Butterworth band-reject filter with central
- frequency <var class="var">frequency</var>, and (3dB-point) band-width <var class="var">width</var>.
- The filter roll off at 6dB per octave (20dB per decade).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the filter’s central frequency. Default is <code class="code">3000</code>.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Specify the band-width of a filter in width_type units.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-30"></a>
- <h4 class="subsection">36.70.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-30" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-30" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change bandreject frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change bandreject width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change bandreject width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change bandreject mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="bass_002c-lowshelf"></a>
- <h3 class="section">36.71 bass, lowshelf<span class="pull-right"><a class="anchor hidden-xs" href="#bass_002c-lowshelf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bass_002c-lowshelf" aria-hidden="true">TOC</a></span></h3>
- <p>Boost or cut the bass (lower) frequencies of the audio using a two-pole
- shelving filter with a response similar to that of a standard
- hi-fi’s tone-controls. This is also known as shelving equalisation (EQ).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Give the gain at 0 Hz. Its useful range is about -20
- (for a large cut) to +20 (for a large boost).
- Beware of clipping when using a positive gain.
- </p>
- </dd>
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the filter’s central frequency and so can be used
- to extend or reduce the frequency range to be boosted or cut.
- The default value is <code class="code">100</code> Hz.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Determine how steep is the filter’s shelf transition.
- </p>
- </dd>
- <dt><samp class="option">poles, p</samp></dt>
- <dd><p>Set number of poles. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-31"></a>
- <h4 class="subsection">36.71.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-31" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-31" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change bass frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change bass width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change bass width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Change bass gain.
- Syntax for the command is : "<var class="var">gain</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change bass mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="biquad"></a>
- <h3 class="section">36.72 biquad<span class="pull-right"><a class="anchor hidden-xs" href="#biquad" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-biquad" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a biquad IIR filter with the given coefficients.
- Where <var class="var">b0</var>, <var class="var">b1</var>, <var class="var">b2</var> and <var class="var">a0</var>, <var class="var">a1</var>, <var class="var">a2</var>
- are the numerator and denominator coefficients respectively.
- and <var class="var">channels</var>, <var class="var">c</var> specify which channels to filter, by default all
- available are filtered.
- </p>
- <a name="Commands-32"></a>
- <h4 class="subsection">36.72.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-32" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-32" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">a0</samp></dt>
- <dt><samp class="option">a1</samp></dt>
- <dt><samp class="option">a2</samp></dt>
- <dt><samp class="option">b0</samp></dt>
- <dt><samp class="option">b1</samp></dt>
- <dt><samp class="option">b2</samp></dt>
- <dd><p>Change biquad parameter.
- Syntax for the command is : "<var class="var">value</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="bs2b"></a>
- <h3 class="section">36.73 bs2b<span class="pull-right"><a class="anchor hidden-xs" href="#bs2b" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bs2b" aria-hidden="true">TOC</a></span></h3>
- <p>Bauer stereo to binaural transformation, which improves headphone listening of
- stereo audio records.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-libbs2b</code>.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">profile</samp></dt>
- <dd><p>Pre-defined crossfeed level.
- </p><dl class="table">
- <dt><samp class="option">default</samp></dt>
- <dd><p>Default level (fcut=700, feed=50).
- </p>
- </dd>
- <dt><samp class="option">cmoy</samp></dt>
- <dd><p>Chu Moy circuit (fcut=700, feed=60).
- </p>
- </dd>
- <dt><samp class="option">jmeier</samp></dt>
- <dd><p>Jan Meier circuit (fcut=650, feed=95).
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">fcut</samp></dt>
- <dd><p>Cut frequency (in Hz).
- </p>
- </dd>
- <dt><samp class="option">feed</samp></dt>
- <dd><p>Feed level (in Hz).
- </p>
- </dd>
- </dl>
- <a name="channelmap"></a>
- <h3 class="section">36.74 channelmap<span class="pull-right"><a class="anchor hidden-xs" href="#channelmap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-channelmap" aria-hidden="true">TOC</a></span></h3>
- <p>Remap input channels to new locations.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">map</samp></dt>
- <dd><p>Map channels from input to output. The argument is a ’|’-separated list of
- mappings, each in the <code class="code"><var class="var">in_channel</var>-<var class="var">out_channel</var></code> or
- <code class="code"><var class="var">in_channel</var></code> form. <var class="var">in_channel</var> can be either the name of the
- input channel (e.g. FL for front left) or its index in the input channel
- layout. <var class="var">out_channel</var> is the name of the output channel or its index in the
- output channel layout. If <var class="var">out_channel</var> is not given then it is implicitly
- an index, starting with zero and increasing by one for each mapping. Mixing
- different types of mappings is not allowed and will result in a parse error.
- </p>
- </dd>
- <dt><samp class="option">channel_layout</samp></dt>
- <dd><p>The channel layout of the output stream. If not specified, then filter will
- guess it based on the <var class="var">out_channel</var> names or the number of mappings.
- Guessed layouts will not necessarily contain channels in the order of the
- mappings.
- </p></dd>
- </dl>
- <p>If no mapping is present, the filter will implicitly map input channels to
- output channels, preserving indices.
- </p>
- <a name="Examples-65"></a>
- <h4 class="subsection">36.74.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-65" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-65" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>For example, assuming a 5.1+downmix input MOV file,
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mov -filter 'channelmap=map=DL-FL|DR-FR' out.wav
- </pre></div>
- <p>will create an output WAV file tagged as stereo from the downmix channels of
- the input.
- </p>
- </li><li>To fix a 5.1 WAV improperly encoded in AAC’s native channel order
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.wav -filter 'channelmap=1|2|0|5|3|4:5.1' out.wav
- </pre></div>
- </li></ul>
- <a name="channelsplit"></a>
- <h3 class="section">36.75 channelsplit<span class="pull-right"><a class="anchor hidden-xs" href="#channelsplit" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-channelsplit" aria-hidden="true">TOC</a></span></h3>
- <p>Split each channel from an input audio stream into a separate output stream.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">channel_layout</samp></dt>
- <dd><p>The channel layout of the input stream. The default is "stereo".
- </p></dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>A channel layout describing the channels to be extracted as separate output streams
- or "all" to extract each input channel as a separate stream. The default is "all".
- </p>
- <p>Choosing channels not present in channel layout in the input will result in an error.
- </p></dd>
- </dl>
- <a name="Examples-66"></a>
- <h4 class="subsection">36.75.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-66" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-66" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>For example, assuming a stereo input MP3 file,
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.mp3 -filter_complex channelsplit out.mkv
- </pre></div>
- <p>will create an output Matroska file with two audio streams, one containing only
- the left channel and the other the right channel.
- </p>
- </li><li>Split a 5.1 WAV file into per-channel files:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.wav -filter_complex
- 'channelsplit=channel_layout=5.1[FL][FR][FC][LFE][SL][SR]'
- -map '[FL]' front_left.wav -map '[FR]' front_right.wav -map '[FC]'
- front_center.wav -map '[LFE]' lfe.wav -map '[SL]' side_left.wav -map '[SR]'
- side_right.wav
- </pre></div>
- </li><li>Extract only LFE from a 5.1 WAV file:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.wav -filter_complex 'channelsplit=channel_layout=5.1:channels=LFE[LFE]'
- -map '[LFE]' lfe.wav
- </pre></div>
- </li></ul>
- <a name="chorus"></a>
- <h3 class="section">36.76 chorus<span class="pull-right"><a class="anchor hidden-xs" href="#chorus" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chorus" aria-hidden="true">TOC</a></span></h3>
- <p>Add a chorus effect to the audio.
- </p>
- <p>Can make a single vocal sound like a chorus, but can also be applied to instrumentation.
- </p>
- <p>Chorus resembles an echo effect with a short delay, but whereas with echo the delay is
- constant, with chorus, it is varied using sinusoidal or triangular modulation.
- The modulation depth defines the range the modulated delay is played before or after
- the delay. Hence the delayed sound will sound slower or faster, that is the delayed
- sound tuned around the original one, like in a chorus where some vocals are slightly
- off key.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">in_gain</samp></dt>
- <dd><p>Set input gain. Default is 0.4.
- </p>
- </dd>
- <dt><samp class="option">out_gain</samp></dt>
- <dd><p>Set output gain. Default is 0.4.
- </p>
- </dd>
- <dt><samp class="option">delays</samp></dt>
- <dd><p>Set delays. A typical delay is around 40ms to 60ms.
- </p>
- </dd>
- <dt><samp class="option">decays</samp></dt>
- <dd><p>Set decays.
- </p>
- </dd>
- <dt><samp class="option">speeds</samp></dt>
- <dd><p>Set speeds.
- </p>
- </dd>
- <dt><samp class="option">depths</samp></dt>
- <dd><p>Set depths.
- </p></dd>
- </dl>
- <a name="Examples-67"></a>
- <h4 class="subsection">36.76.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-67" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-67" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>A single delay:
- <div class="example">
- <pre class="example-preformatted">chorus=0.7:0.9:55:0.4:0.25:2
- </pre></div>
- </li><li>Two delays:
- <div class="example">
- <pre class="example-preformatted">chorus=0.6:0.9:50|60:0.4|0.32:0.25|0.4:2|1.3
- </pre></div>
- </li><li>Fuller sounding chorus with three delays:
- <div class="example">
- <pre class="example-preformatted">chorus=0.5:0.9:50|60|40:0.4|0.32|0.3:0.25|0.4|0.3:2|2.3|1.3
- </pre></div>
- </li></ul>
- <a name="compand"></a>
- <h3 class="section">36.77 compand<span class="pull-right"><a class="anchor hidden-xs" href="#compand" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-compand" aria-hidden="true">TOC</a></span></h3>
- <p>Compress or expand the audio’s dynamic range.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">attacks</samp></dt>
- <dt><samp class="option">decays</samp></dt>
- <dd><p>A list of times in seconds for each channel over which the instantaneous level
- of the input signal is averaged to determine its volume. <var class="var">attacks</var> refers to
- increase of volume and <var class="var">decays</var> refers to decrease of volume. For most
- situations, the attack time (response to the audio getting louder) should be
- shorter than the decay time, because the human ear is more sensitive to sudden
- loud audio than sudden soft audio. A typical value for attack is 0.3 seconds and
- a typical value for decay is 0.8 seconds.
- If specified number of attacks & decays is lower than number of channels, the last
- set attack/decay will be used for all remaining channels.
- </p>
- </dd>
- <dt><samp class="option">points</samp></dt>
- <dd><p>A list of points for the transfer function, specified in dB relative to the
- maximum possible signal amplitude. Each key points list must be defined using
- the following syntax: <code class="code">x0/y0|x1/y1|x2/y2|....</code> or
- <code class="code">x0/y0 x1/y1 x2/y2 ....</code>
- </p>
- <p>The input values must be in strictly increasing order but the transfer function
- does not have to be monotonically rising. The point <code class="code">0/0</code> is assumed but
- may be overridden (by <code class="code">0/out-dBn</code>). Typical values for the transfer
- function are <code class="code">-70/-70|-60/-20|1/0</code>.
- </p>
- </dd>
- <dt><samp class="option">soft-knee</samp></dt>
- <dd><p>Set the curve radius in dB for all joints. It defaults to 0.01.
- </p>
- </dd>
- <dt><samp class="option">gain</samp></dt>
- <dd><p>Set the additional gain in dB to be applied at all points on the transfer
- function. This allows for easy adjustment of the overall gain.
- It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">volume</samp></dt>
- <dd><p>Set an initial volume, in dB, to be assumed for each channel when filtering
- starts. This permits the user to supply a nominal level initially, so that, for
- example, a very large gain is not applied to initial signal levels before the
- companding has begun to operate. A typical value for audio which is initially
- quiet is -90 dB. It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Set a delay, in seconds. The input audio is analyzed immediately, but audio is
- delayed before being fed to the volume adjuster. Specifying a delay
- approximately equal to the attack/decay times allows the filter to effectively
- operate in predictive rather than reactive mode. It defaults to 0.
- </p>
- </dd>
- </dl>
- <a name="Examples-68"></a>
- <h4 class="subsection">36.77.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-68" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-68" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make music with both quiet and loud passages suitable for listening to in a
- noisy environment:
- <div class="example">
- <pre class="example-preformatted">compand=.3|.3:1|1:-90/-60|-60/-40|-40/-30|-20/-20:6:0:-90:0.2
- </pre></div>
- <p>Another example for audio with whisper and explosion parts:
- </p><div class="example">
- <pre class="example-preformatted">compand=0|0:1|1:-90/-900|-70/-70|-30/-9|0/-3:6:0:0:0
- </pre></div>
- </li><li>A noise gate for when the noise is at a lower level than the signal:
- <div class="example">
- <pre class="example-preformatted">compand=.1|.1:.2|.2:-900/-900|-50.1/-900|-50/-50:.01:0:-90:.1
- </pre></div>
- </li><li>Here is another noise gate, this time for when the noise is at a higher level
- than the signal (making it, in some ways, similar to squelch):
- <div class="example">
- <pre class="example-preformatted">compand=.1|.1:.1|.1:-45.1/-45.1|-45/-900|0/-900:.01:45:-90:.1
- </pre></div>
- </li><li>2:1 compression starting at -6dB:
- <div class="example">
- <pre class="example-preformatted">compand=points=-80/-80|-6/-6|0/-3.8|20/3.5
- </pre></div>
- </li><li>2:1 compression starting at -9dB:
- <div class="example">
- <pre class="example-preformatted">compand=points=-80/-80|-9/-9|0/-5.3|20/2.9
- </pre></div>
- </li><li>2:1 compression starting at -12dB:
- <div class="example">
- <pre class="example-preformatted">compand=points=-80/-80|-12/-12|0/-6.8|20/1.9
- </pre></div>
- </li><li>2:1 compression starting at -18dB:
- <div class="example">
- <pre class="example-preformatted">compand=points=-80/-80|-18/-18|0/-9.8|20/0.7
- </pre></div>
- </li><li>3:1 compression starting at -15dB:
- <div class="example">
- <pre class="example-preformatted">compand=points=-80/-80|-15/-15|0/-10.8|20/-5.2
- </pre></div>
- </li><li>Compressor/Gate:
- <div class="example">
- <pre class="example-preformatted">compand=points=-80/-105|-62/-80|-15.4/-15.4|0/-12|20/-7.6
- </pre></div>
- </li><li>Expander:
- <div class="example">
- <pre class="example-preformatted">compand=attacks=0:points=-80/-169|-54/-80|-49.5/-64.6|-41.1/-41.1|-25.8/-15|-10.8/-4.5|0/0|20/8.3
- </pre></div>
- </li><li>Hard limiter at -6dB:
- <div class="example">
- <pre class="example-preformatted">compand=attacks=0:points=-80/-80|-6/-6|20/-6
- </pre></div>
- </li><li>Hard limiter at -12dB:
- <div class="example">
- <pre class="example-preformatted">compand=attacks=0:points=-80/-80|-12/-12|20/-12
- </pre></div>
- </li><li>Hard noise gate at -35 dB:
- <div class="example">
- <pre class="example-preformatted">compand=attacks=0:points=-80/-115|-35.1/-80|-35/-35|20/20
- </pre></div>
- </li><li>Soft limiter:
- <div class="example">
- <pre class="example-preformatted">compand=attacks=0:points=-80/-80|-12.4/-12.4|-6/-8|0/-6.8|20/-2.8
- </pre></div>
- </li></ul>
- <a name="compensationdelay"></a>
- <h3 class="section">36.78 compensationdelay<span class="pull-right"><a class="anchor hidden-xs" href="#compensationdelay" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-compensationdelay" aria-hidden="true">TOC</a></span></h3>
- <p>Compensation Delay Line is a metric based delay to compensate differing
- positions of microphones or speakers.
- </p>
- <p>For example, you have recorded guitar with two microphones placed in
- different locations. Because the front of sound wave has fixed speed in
- normal conditions, the phasing of microphones can vary and depends on
- their location and interposition. The best sound mix can be achieved when
- these microphones are in phase (synchronized). Note that a distance of
- ~30 cm between microphones makes one microphone capture the signal in
- antiphase to the other microphone. That makes the final mix sound moody.
- This filter helps to solve phasing problems by adding different delays
- to each microphone track and make them synchronized.
- </p>
- <p>The best result can be reached when you take one track as base and
- synchronize other tracks one by one with it.
- Remember that synchronization/delay tolerance depends on sample rate, too.
- Higher sample rates will give more tolerance.
- </p>
- <p>The filter accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mm</samp></dt>
- <dd><p>Set millimeters distance. This is compensation distance for fine tuning.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">cm</samp></dt>
- <dd><p>Set cm distance. This is compensation distance for tightening distance setup.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">m</samp></dt>
- <dd><p>Set meters distance. This is compensation distance for hard distance setup.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">dry</samp></dt>
- <dd><p>Set dry amount. Amount of unprocessed (dry) signal.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">wet</samp></dt>
- <dd><p>Set wet amount. Amount of processed (wet) signal.
- Default is 1.
- </p>
- </dd>
- <dt><samp class="option">temp</samp></dt>
- <dd><p>Set temperature in degrees Celsius. This is the temperature of the environment.
- Default is 20.
- </p></dd>
- </dl>
- <a name="Commands-33"></a>
- <h4 class="subsection">36.78.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-33" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-33" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="crossfeed"></a>
- <h3 class="section">36.79 crossfeed<span class="pull-right"><a class="anchor hidden-xs" href="#crossfeed" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-crossfeed" aria-hidden="true">TOC</a></span></h3>
- <p>Apply headphone crossfeed filter.
- </p>
- <p>Crossfeed is the process of blending the left and right channels of stereo
- audio recording.
- It is mainly used to reduce extreme stereo separation of low frequencies.
- </p>
- <p>The intent is to produce more speaker like sound to the listener.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Set strength of crossfeed. Default is 0.2. Allowed range is from 0 to 1.
- This sets gain of low shelf filter for side part of stereo image.
- Default is -6dB. Max allowed is -30db when strength is set to 1.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Set soundstage wideness. Default is 0.5. Allowed range is from 0 to 1.
- This sets cut off frequency of low shelf filter. Default is cut off near
- 1550 Hz. With range set to 1 cut off frequency is set to 2100 Hz.
- </p>
- </dd>
- <dt><samp class="option">slope</samp></dt>
- <dd><p>Set curve slope of low shelf filter. Default is 0.5.
- Allowed range is from 0.01 to 1.
- </p>
- </dd>
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain. Default is 0.9.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output gain. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">block_size</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-34"></a>
- <h4 class="subsection">36.79.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-34" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-34" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="crystalizer"></a>
- <h3 class="section">36.80 crystalizer<span class="pull-right"><a class="anchor hidden-xs" href="#crystalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-crystalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Simple algorithm for audio noise sharpening.
- </p>
- <p>This filter linearly increases differences between each audio sample.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Sets the intensity of effect (default: 2.0). Must be in range between -10.0 to 0
- (unchanged sound) to 10.0 (maximum effect).
- To inverse filtering use negative value.
- </p>
- </dd>
- <dt><samp class="option">c</samp></dt>
- <dd><p>Enable clipping. By default is enabled.
- </p></dd>
- </dl>
- <a name="Commands-35"></a>
- <h4 class="subsection">36.80.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-35" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-35" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="dcshift"></a>
- <h3 class="section">36.81 dcshift<span class="pull-right"><a class="anchor hidden-xs" href="#dcshift" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dcshift" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a DC shift to the audio.
- </p>
- <p>This can be useful to remove a DC offset (caused perhaps by a hardware problem
- in the recording chain) from the audio. The effect of a DC offset is reduced
- headroom and hence volume. The <a class="ref" href="#astats">astats</a> filter can be used to determine if
- a signal has a DC offset.
- </p>
- <dl class="table">
- <dt><samp class="option">shift</samp></dt>
- <dd><p>Set the DC shift, allowed range is [-1, 1]. It indicates the amount to shift
- the audio.
- </p>
- </dd>
- <dt><samp class="option">limitergain</samp></dt>
- <dd><p>Optional. It should have a value much less than 1 (e.g. 0.05 or 0.02) and is
- used to prevent clipping.
- </p></dd>
- </dl>
- <a name="deesser"></a>
- <h3 class="section">36.82 deesser<span class="pull-right"><a class="anchor hidden-xs" href="#deesser" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deesser" aria-hidden="true">TOC</a></span></h3>
- <p>Apply de-essing to the audio samples.
- </p>
- <dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Set intensity for triggering de-essing. Allowed range is from 0 to 1.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">m</samp></dt>
- <dd><p>Set amount of ducking on treble part of sound. Allowed range is from 0 to 1.
- Default is 0.5.
- </p>
- </dd>
- <dt><samp class="option">f</samp></dt>
- <dd><p>How much of original frequency content to keep when de-essing. Allowed range is from 0 to 1.
- Default is 0.5.
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set the output mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">i</samp></dt>
- <dd><p>Pass input unchanged.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Pass ess filtered out.
- </p>
- </dd>
- <dt><samp class="option">e</samp></dt>
- <dd><p>Pass only ess.
- </p>
- <p>Default value is <var class="var">o</var>.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="dialoguenhance"></a>
- <h3 class="section">36.83 dialoguenhance<span class="pull-right"><a class="anchor hidden-xs" href="#dialoguenhance" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dialoguenhance" aria-hidden="true">TOC</a></span></h3>
- <p>Enhance dialogue in stereo audio.
- </p>
- <p>This filter accepts stereo input and produce surround (3.0) channels output.
- The newly produced front center channel have enhanced speech dialogue originally
- available in both stereo channels.
- This filter outputs front left and front right channels same as available in stereo input.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">original</samp></dt>
- <dd><p>Set the original center factor to keep in front center channel output.
- Allowed range is from 0 to 1. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">enhance</samp></dt>
- <dd><p>Set the dialogue enhance factor to put in front center channel output.
- Allowed range is from 0 to 3. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">voice</samp></dt>
- <dd><p>Set the voice detection factor.
- Allowed range is from 2 to 32. Default value is 2.
- </p></dd>
- </dl>
- <a name="Commands-36"></a>
- <h4 class="subsection">36.83.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-36" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-36" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="drmeter"></a>
- <h3 class="section">36.84 drmeter<span class="pull-right"><a class="anchor hidden-xs" href="#drmeter" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drmeter" aria-hidden="true">TOC</a></span></h3>
- <p>Measure audio dynamic range.
- </p>
- <p>DR values of 14 and higher is found in very dynamic material. DR of 8 to 13
- is found in transition material. And anything less that 8 have very poor dynamics
- and is very compressed.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">length</samp></dt>
- <dd><p>Set window length in seconds used to split audio into segments of equal length.
- Default is 3 seconds.
- </p></dd>
- </dl>
- <a name="dynaudnorm"></a>
- <h3 class="section">36.85 dynaudnorm<span class="pull-right"><a class="anchor hidden-xs" href="#dynaudnorm" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dynaudnorm" aria-hidden="true">TOC</a></span></h3>
- <p>Dynamic Audio Normalizer.
- </p>
- <p>This filter applies a certain amount of gain to the input audio in order
- to bring its peak magnitude to a target level (e.g. 0 dBFS). However, in
- contrast to more "simple" normalization algorithms, the Dynamic Audio
- Normalizer *dynamically* re-adjusts the gain factor to the input audio.
- This allows for applying extra gain to the "quiet" sections of the audio
- while avoiding distortions or clipping the "loud" sections. In other words:
- The Dynamic Audio Normalizer will "even out" the volume of quiet and loud
- sections, in the sense that the volume of each section is brought to the
- same target level. Note, however, that the Dynamic Audio Normalizer achieves
- this goal *without* applying "dynamic range compressing". It will retain 100%
- of the dynamic range *within* each section of the audio file.
- </p>
- <dl class="table">
- <dt><samp class="option">framelen, f</samp></dt>
- <dd><p>Set the frame length in milliseconds. In range from 10 to 8000 milliseconds.
- Default is 500 milliseconds.
- The Dynamic Audio Normalizer processes the input audio in small chunks,
- referred to as frames. This is required, because a peak magnitude has no
- meaning for just a single sample value. Instead, we need to determine the
- peak magnitude for a contiguous sequence of sample values. While a "standard"
- normalizer would simply use the peak magnitude of the complete file, the
- Dynamic Audio Normalizer determines the peak magnitude individually for each
- frame. The length of a frame is specified in milliseconds. By default, the
- Dynamic Audio Normalizer uses a frame length of 500 milliseconds, which has
- been found to give good results with most files.
- Note that the exact frame length, in number of samples, will be determined
- automatically, based on the sampling rate of the individual input audio file.
- </p>
- </dd>
- <dt><samp class="option">gausssize, g</samp></dt>
- <dd><p>Set the Gaussian filter window size. In range from 3 to 301, must be odd
- number. Default is 31.
- Probably the most important parameter of the Dynamic Audio Normalizer is the
- <code class="code">window size</code> of the Gaussian smoothing filter. The filter’s window size
- is specified in frames, centered around the current frame. For the sake of
- simplicity, this must be an odd number. Consequently, the default value of 31
- takes into account the current frame, as well as the 15 preceding frames and
- the 15 subsequent frames. Using a larger window results in a stronger
- smoothing effect and thus in less gain variation, i.e. slower gain
- adaptation. Conversely, using a smaller window results in a weaker smoothing
- effect and thus in more gain variation, i.e. faster gain adaptation.
- In other words, the more you increase this value, the more the Dynamic Audio
- Normalizer will behave like a "traditional" normalization filter. On the
- contrary, the more you decrease this value, the more the Dynamic Audio
- Normalizer will behave like a dynamic range compressor.
- </p>
- </dd>
- <dt><samp class="option">peak, p</samp></dt>
- <dd><p>Set the target peak value. This specifies the highest permissible magnitude
- level for the normalized audio input. This filter will try to approach the
- target peak magnitude as closely as possible, but at the same time it also
- makes sure that the normalized signal will never exceed the peak magnitude.
- A frame’s maximum local gain factor is imposed directly by the target peak
- magnitude. The default value is 0.95 and thus leaves a headroom of 5%*.
- It is not recommended to go above this value.
- </p>
- </dd>
- <dt><samp class="option">maxgain, m</samp></dt>
- <dd><p>Set the maximum gain factor. In range from 1.0 to 100.0. Default is 10.0.
- The Dynamic Audio Normalizer determines the maximum possible (local) gain
- factor for each input frame, i.e. the maximum gain factor that does not
- result in clipping or distortion. The maximum gain factor is determined by
- the frame’s highest magnitude sample. However, the Dynamic Audio Normalizer
- additionally bounds the frame’s maximum gain factor by a predetermined
- (global) maximum gain factor. This is done in order to avoid excessive gain
- factors in "silent" or almost silent frames. By default, the maximum gain
- factor is 10.0, For most inputs the default value should be sufficient and
- it usually is not recommended to increase this value. Though, for input
- with an extremely low overall volume level, it may be necessary to allow even
- higher gain factors. Note, however, that the Dynamic Audio Normalizer does
- not simply apply a "hard" threshold (i.e. cut off values above the threshold).
- Instead, a "sigmoid" threshold function will be applied. This way, the
- gain factors will smoothly approach the threshold value, but never exceed that
- value.
- </p>
- </dd>
- <dt><samp class="option">targetrms, r</samp></dt>
- <dd><p>Set the target RMS. In range from 0.0 to 1.0. Default is 0.0 - disabled.
- By default, the Dynamic Audio Normalizer performs "peak" normalization.
- This means that the maximum local gain factor for each frame is defined
- (only) by the frame’s highest magnitude sample. This way, the samples can
- be amplified as much as possible without exceeding the maximum signal
- level, i.e. without clipping. Optionally, however, the Dynamic Audio
- Normalizer can also take into account the frame’s root mean square,
- abbreviated RMS. In electrical engineering, the RMS is commonly used to
- determine the power of a time-varying signal. It is therefore considered
- that the RMS is a better approximation of the "perceived loudness" than
- just looking at the signal’s peak magnitude. Consequently, by adjusting all
- frames to a constant RMS value, a uniform "perceived loudness" can be
- established. If a target RMS value has been specified, a frame’s local gain
- factor is defined as the factor that would result in exactly that RMS value.
- Note, however, that the maximum local gain factor is still restricted by the
- frame’s highest magnitude sample, in order to prevent clipping.
- </p>
- </dd>
- <dt><samp class="option">coupling, n</samp></dt>
- <dd><p>Enable channels coupling. By default is enabled.
- By default, the Dynamic Audio Normalizer will amplify all channels by the same
- amount. This means the same gain factor will be applied to all channels, i.e.
- the maximum possible gain factor is determined by the "loudest" channel.
- However, in some recordings, it may happen that the volume of the different
- channels is uneven, e.g. one channel may be "quieter" than the other one(s).
- In this case, this option can be used to disable the channel coupling. This way,
- the gain factor will be determined independently for each channel, depending
- only on the individual channel’s highest magnitude sample. This allows for
- harmonizing the volume of the different channels.
- </p>
- </dd>
- <dt><samp class="option">correctdc, c</samp></dt>
- <dd><p>Enable DC bias correction. By default is disabled.
- An audio signal (in the time domain) is a sequence of sample values.
- In the Dynamic Audio Normalizer these sample values are represented in the
- -1.0 to 1.0 range, regardless of the original input format. Normally, the
- audio signal, or "waveform", should be centered around the zero point.
- That means if we calculate the mean value of all samples in a file, or in a
- single frame, then the result should be 0.0 or at least very close to that
- value. If, however, there is a significant deviation of the mean value from
- 0.0, in either positive or negative direction, this is referred to as a
- DC bias or DC offset. Since a DC bias is clearly undesirable, the Dynamic
- Audio Normalizer provides optional DC bias correction.
- With DC bias correction enabled, the Dynamic Audio Normalizer will determine
- the mean value, or "DC correction" offset, of each input frame and subtract
- that value from all of the frame’s sample values which ensures those samples
- are centered around 0.0 again. Also, in order to avoid "gaps" at the frame
- boundaries, the DC correction offset values will be interpolated smoothly
- between neighbouring frames.
- </p>
- </dd>
- <dt><samp class="option">altboundary, b</samp></dt>
- <dd><p>Enable alternative boundary mode. By default is disabled.
- The Dynamic Audio Normalizer takes into account a certain neighbourhood
- around each frame. This includes the preceding frames as well as the
- subsequent frames. However, for the "boundary" frames, located at the very
- beginning and at the very end of the audio file, not all neighbouring
- frames are available. In particular, for the first few frames in the audio
- file, the preceding frames are not known. And, similarly, for the last few
- frames in the audio file, the subsequent frames are not known. Thus, the
- question arises which gain factors should be assumed for the missing frames
- in the "boundary" region. The Dynamic Audio Normalizer implements two modes
- to deal with this situation. The default boundary mode assumes a gain factor
- of exactly 1.0 for the missing frames, resulting in a smooth "fade in" and
- "fade out" at the beginning and at the end of the input, respectively.
- </p>
- </dd>
- <dt><samp class="option">compress, s</samp></dt>
- <dd><p>Set the compress factor. In range from 0.0 to 30.0. Default is 0.0.
- By default, the Dynamic Audio Normalizer does not apply "traditional"
- compression. This means that signal peaks will not be pruned and thus the
- full dynamic range will be retained within each local neighbourhood. However,
- in some cases it may be desirable to combine the Dynamic Audio Normalizer’s
- normalization algorithm with a more "traditional" compression.
- For this purpose, the Dynamic Audio Normalizer provides an optional compression
- (thresholding) function. If (and only if) the compression feature is enabled,
- all input frames will be processed by a soft knee thresholding function prior
- to the actual normalization process. Put simply, the thresholding function is
- going to prune all samples whose magnitude exceeds a certain threshold value.
- However, the Dynamic Audio Normalizer does not simply apply a fixed threshold
- value. Instead, the threshold value will be adjusted for each individual
- frame.
- In general, smaller parameters result in stronger compression, and vice versa.
- Values below 3.0 are not recommended, because audible distortion may appear.
- </p>
- </dd>
- <dt><samp class="option">threshold, t</samp></dt>
- <dd><p>Set the target threshold value. This specifies the lowest permissible
- magnitude level for the audio input which will be normalized.
- If input frame volume is above this value frame will be normalized.
- Otherwise frame may not be normalized at all. The default value is set
- to 0, which means all input frames will be normalized.
- This option is mostly useful if digital noise is not wanted to be amplified.
- </p>
- </dd>
- <dt><samp class="option">channels, h</samp></dt>
- <dd><p>Specify which channels to filter, by default all available channels are filtered.
- </p>
- </dd>
- <dt><samp class="option">overlap, o</samp></dt>
- <dd><p>Specify overlap for frames. If set to 0 (default) no frame overlapping is done.
- Using >0 and <1 values will make less conservative gain adjustments, like
- when framelen option is set to smaller value, if framelen option value is
- compensated for non-zero overlap then gain adjustments will be smoother across time
- compared to zero overlap case.
- </p>
- </dd>
- <dt><samp class="option">curve, v</samp></dt>
- <dd><p>Specify the peak mapping curve expression which is going to be used when calculating
- gain applied to frames. The max output frame gain will still be limited by other
- options mentioned previously for this filter.
- </p>
- <p>The expression can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">ch</samp></dt>
- <dd><p>current channel number
- </p>
- </dd>
- <dt><samp class="option">sn</samp></dt>
- <dd><p>current sample number
- </p>
- </dd>
- <dt><samp class="option">nb_channels</samp></dt>
- <dd><p>number of channels
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>timestamp expressed in seconds
- </p>
- </dd>
- <dt><samp class="option">sr</samp></dt>
- <dd><p>sample rate
- </p>
- </dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>current frame peak value
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-37"></a>
- <h4 class="subsection">36.85.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-37" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-37" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="earwax"></a>
- <h3 class="section">36.86 earwax<span class="pull-right"><a class="anchor hidden-xs" href="#earwax" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-earwax" aria-hidden="true">TOC</a></span></h3>
- <p>Make audio easier to listen to on headphones.
- </p>
- <p>This filter adds ‘cues’ to 44.1kHz stereo (i.e. audio CD format) audio
- so that when listened to on headphones the stereo image is moved from
- inside your head (standard for headphones) to outside and in front of
- the listener (standard for speakers).
- </p>
- <p>Ported from SoX.
- </p>
- <a name="equalizer"></a>
- <h3 class="section">36.87 equalizer<span class="pull-right"><a class="anchor hidden-xs" href="#equalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-equalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a two-pole peaking equalisation (EQ) filter. With this
- filter, the signal-level at and around a selected frequency can
- be increased or decreased, whilst (unlike bandpass and bandreject
- filters) that at all other frequencies is unchanged.
- </p>
- <p>In order to produce complex equalisation curves, this filter can
- be given several times, each with a different central frequency.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the filter’s central frequency in Hz.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Specify the band-width of a filter in width_type units.
- </p>
- </dd>
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Set the required gain or attenuation in dB.
- Beware of clipping when using a positive gain.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Examples-69"></a>
- <h4 class="subsection">36.87.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-69" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-69" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Attenuate 10 dB at 1000 Hz, with a bandwidth of 200 Hz:
- <div class="example">
- <pre class="example-preformatted">equalizer=f=1000:t=h:width=200:g=-10
- </pre></div>
- </li><li>Apply 2 dB gain at 1000 Hz with Q 1 and attenuate 5 dB at 100 Hz with Q 2:
- <div class="example">
- <pre class="example-preformatted">equalizer=f=1000:t=q:w=1:g=2,equalizer=f=100:t=q:w=2:g=-5
- </pre></div>
- </li></ul>
- <a name="Commands-38"></a>
- <h4 class="subsection">36.87.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-38" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-38" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change equalizer frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change equalizer width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change equalizer width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Change equalizer gain.
- Syntax for the command is : "<var class="var">gain</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change equalizer mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="extrastereo"></a>
- <h3 class="section">36.88 extrastereo<span class="pull-right"><a class="anchor hidden-xs" href="#extrastereo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-extrastereo" aria-hidden="true">TOC</a></span></h3>
- <p>Linearly increases the difference between left and right channels which
- adds some sort of "live" effect to playback.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">m</samp></dt>
- <dd><p>Sets the difference coefficient (default: 2.5). 0.0 means mono sound
- (average of both channels), with 1.0 sound will be unchanged, with
- -1.0 left and right channels will be swapped.
- </p>
- </dd>
- <dt><samp class="option">c</samp></dt>
- <dd><p>Enable clipping. By default is enabled.
- </p></dd>
- </dl>
- <a name="Commands-39"></a>
- <h4 class="subsection">36.88.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-39" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-39" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="firequalizer"></a>
- <h3 class="section">36.89 firequalizer<span class="pull-right"><a class="anchor hidden-xs" href="#firequalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-firequalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Apply FIR Equalization using arbitrary frequency response.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">gain</samp></dt>
- <dd><p>Set gain curve equation (in dB). The expression can contain variables:
- </p><dl class="table">
- <dt><samp class="option">f</samp></dt>
- <dd><p>the evaluated frequency
- </p></dd>
- <dt><samp class="option">sr</samp></dt>
- <dd><p>sample rate
- </p></dd>
- <dt><samp class="option">ch</samp></dt>
- <dd><p>channel number, set to 0 when multichannels evaluation is disabled
- </p></dd>
- <dt><samp class="option">chid</samp></dt>
- <dd><p>channel id, see libavutil/channel_layout.h, set to the first channel id when
- multichannels evaluation is disabled
- </p></dd>
- <dt><samp class="option">chs</samp></dt>
- <dd><p>number of channels
- </p></dd>
- <dt><samp class="option">chlayout</samp></dt>
- <dd><p>channel_layout, see libavutil/channel_layout.h
- </p>
- </dd>
- </dl>
- <p>and functions:
- </p><dl class="table">
- <dt><samp class="option">gain_interpolate(f)</samp></dt>
- <dd><p>interpolate gain on frequency f based on gain_entry
- </p></dd>
- <dt><samp class="option">cubic_interpolate(f)</samp></dt>
- <dd><p>same as gain_interpolate, but smoother
- </p></dd>
- </dl>
- <p>This option is also available as command. Default is <code class="code">gain_interpolate(f)</code>.
- </p>
- </dd>
- <dt><samp class="option">gain_entry</samp></dt>
- <dd><p>Set gain entry for gain_interpolate function. The expression can
- contain functions:
- </p><dl class="table">
- <dt><samp class="option">entry(f, g)</samp></dt>
- <dd><p>store gain entry at frequency f with value g
- </p></dd>
- </dl>
- <p>This option is also available as command.
- </p>
- </dd>
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Set filter delay in seconds. Higher value means more accurate.
- Default is <code class="code">0.01</code>.
- </p>
- </dd>
- <dt><samp class="option">accuracy</samp></dt>
- <dd><p>Set filter accuracy in Hz. Lower value means more accurate.
- Default is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">wfunc</samp></dt>
- <dd><p>Set window function. Acceptable values are:
- </p><dl class="table">
- <dt><samp class="option">rectangular</samp></dt>
- <dd><p>rectangular window, useful when gain curve is already smooth
- </p></dd>
- <dt><samp class="option">hann</samp></dt>
- <dd><p>hann window (default)
- </p></dd>
- <dt><samp class="option">hamming</samp></dt>
- <dd><p>hamming window
- </p></dd>
- <dt><samp class="option">blackman</samp></dt>
- <dd><p>blackman window
- </p></dd>
- <dt><samp class="option">nuttall3</samp></dt>
- <dd><p>3-terms continuous 1st derivative nuttall window
- </p></dd>
- <dt><samp class="option">mnuttall3</samp></dt>
- <dd><p>minimum 3-terms discontinuous nuttall window
- </p></dd>
- <dt><samp class="option">nuttall</samp></dt>
- <dd><p>4-terms continuous 1st derivative nuttall window
- </p></dd>
- <dt><samp class="option">bnuttall</samp></dt>
- <dd><p>minimum 4-terms discontinuous nuttall (blackman-nuttall) window
- </p></dd>
- <dt><samp class="option">bharris</samp></dt>
- <dd><p>blackman-harris window
- </p></dd>
- <dt><samp class="option">tukey</samp></dt>
- <dd><p>tukey window
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">fixed</samp></dt>
- <dd><p>If enabled, use fixed number of audio samples. This improves speed when
- filtering with large delay. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">multi</samp></dt>
- <dd><p>Enable multichannels evaluation on gain. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">zero_phase</samp></dt>
- <dd><p>Enable zero phase mode by subtracting timestamp to compensate delay.
- Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set scale used by gain. Acceptable values are:
- </p><dl class="table">
- <dt><samp class="option">linlin</samp></dt>
- <dd><p>linear frequency, linear gain
- </p></dd>
- <dt><samp class="option">linlog</samp></dt>
- <dd><p>linear frequency, logarithmic (in dB) gain (default)
- </p></dd>
- <dt><samp class="option">loglin</samp></dt>
- <dd><p>logarithmic (in octave scale where 20 Hz is 0) frequency, linear gain
- </p></dd>
- <dt><samp class="option">loglog</samp></dt>
- <dd><p>logarithmic frequency, logarithmic gain
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dumpfile</samp></dt>
- <dd><p>Set file for dumping, suitable for gnuplot.
- </p>
- </dd>
- <dt><samp class="option">dumpscale</samp></dt>
- <dd><p>Set scale for dumpfile. Acceptable values are same with scale option.
- Default is linlog.
- </p>
- </dd>
- <dt><samp class="option">fft2</samp></dt>
- <dd><p>Enable 2-channel convolution using complex FFT. This improves speed significantly.
- Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">min_phase</samp></dt>
- <dd><p>Enable minimum phase impulse response. Default is disabled.
- </p></dd>
- </dl>
- <a name="Examples-70"></a>
- <h4 class="subsection">36.89.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-70" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-70" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>lowpass at 1000 Hz:
- <div class="example">
- <pre class="example-preformatted">firequalizer=gain='if(lt(f,1000), 0, -INF)'
- </pre></div>
- </li><li>lowpass at 1000 Hz with gain_entry:
- <div class="example">
- <pre class="example-preformatted">firequalizer=gain_entry='entry(1000,0); entry(1001, -INF)'
- </pre></div>
- </li><li>custom equalization:
- <div class="example">
- <pre class="example-preformatted">firequalizer=gain_entry='entry(100,0); entry(400, -4); entry(1000, -6); entry(2000, 0)'
- </pre></div>
- </li><li>higher delay with zero phase to compensate delay:
- <div class="example">
- <pre class="example-preformatted">firequalizer=delay=0.1:fixed=on:zero_phase=on
- </pre></div>
- </li><li>lowpass on left channel, highpass on right channel:
- <div class="example">
- <pre class="example-preformatted">firequalizer=gain='if(eq(chid,1), gain_interpolate(f), if(eq(chid,2), gain_interpolate(1e6+f), 0))'
- :gain_entry='entry(1000, 0); entry(1001,-INF); entry(1e6+1000,0)':multi=on
- </pre></div>
- </li></ul>
- <a name="flanger"></a>
- <h3 class="section">36.90 flanger<span class="pull-right"><a class="anchor hidden-xs" href="#flanger" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flanger" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a flanging effect to the audio.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Set base delay in milliseconds. Range from 0 to 30. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">depth</samp></dt>
- <dd><p>Set added sweep delay in milliseconds. Range from 0 to 10. Default value is 2.
- </p>
- </dd>
- <dt><samp class="option">regen</samp></dt>
- <dd><p>Set percentage regeneration (delayed signal feedback). Range from -95 to 95.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>Set percentage of delayed signal mixed with original. Range from 0 to 100.
- Default value is 71.
- </p>
- </dd>
- <dt><samp class="option">speed</samp></dt>
- <dd><p>Set sweeps per second (Hz). Range from 0.1 to 10. Default value is 0.5.
- </p>
- </dd>
- <dt><samp class="option">shape</samp></dt>
- <dd><p>Set swept wave shape, can be <var class="var">triangular</var> or <var class="var">sinusoidal</var>.
- Default value is <var class="var">sinusoidal</var>.
- </p>
- </dd>
- <dt><samp class="option">phase</samp></dt>
- <dd><p>Set swept wave percentage-shift for multi channel. Range from 0 to 100.
- Default value is 25.
- </p>
- </dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Set delay-line interpolation, <var class="var">linear</var> or <var class="var">quadratic</var>.
- Default is <var class="var">linear</var>.
- </p></dd>
- </dl>
- <a name="haas"></a>
- <h3 class="section">36.91 haas<span class="pull-right"><a class="anchor hidden-xs" href="#haas" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-haas" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Haas effect to audio.
- </p>
- <p>Note that this makes most sense to apply on mono signals.
- With this filter applied to mono signals it give some directionality and
- stretches its stereo image.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input level. By default is <var class="var">1</var>, or 0dB
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output level. By default is <var class="var">1</var>, or 0dB.
- </p>
- </dd>
- <dt><samp class="option">side_gain</samp></dt>
- <dd><p>Set gain applied to side part of signal. By default is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">middle_source</samp></dt>
- <dd><p>Set kind of middle source. Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">left</samp>’</dt>
- <dd><p>Pick left channel.
- </p>
- </dd>
- <dt>‘<samp class="samp">right</samp>’</dt>
- <dd><p>Pick right channel.
- </p>
- </dd>
- <dt>‘<samp class="samp">mid</samp>’</dt>
- <dd><p>Pick middle part signal of stereo image.
- </p>
- </dd>
- <dt>‘<samp class="samp">side</samp>’</dt>
- <dd><p>Pick side part signal of stereo image.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">middle_phase</samp></dt>
- <dd><p>Change middle phase. By default is disabled.
- </p>
- </dd>
- <dt><samp class="option">left_delay</samp></dt>
- <dd><p>Set left channel delay. By default is <var class="var">2.05</var> milliseconds.
- </p>
- </dd>
- <dt><samp class="option">left_balance</samp></dt>
- <dd><p>Set left channel balance. By default is <var class="var">-1</var>.
- </p>
- </dd>
- <dt><samp class="option">left_gain</samp></dt>
- <dd><p>Set left channel gain. By default is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">left_phase</samp></dt>
- <dd><p>Change left phase. By default is disabled.
- </p>
- </dd>
- <dt><samp class="option">right_delay</samp></dt>
- <dd><p>Set right channel delay. By defaults is <var class="var">2.12</var> milliseconds.
- </p>
- </dd>
- <dt><samp class="option">right_balance</samp></dt>
- <dd><p>Set right channel balance. By default is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">right_gain</samp></dt>
- <dd><p>Set right channel gain. By default is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">right_phase</samp></dt>
- <dd><p>Change right phase. By default is enabled.
- </p></dd>
- </dl>
- <a name="hdcd"></a>
- <h3 class="section">36.92 hdcd<span class="pull-right"><a class="anchor hidden-xs" href="#hdcd" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hdcd" aria-hidden="true">TOC</a></span></h3>
- <p>Decodes High Definition Compatible Digital (HDCD) data. A 16-bit PCM stream with
- embedded HDCD codes is expanded into a 20-bit PCM stream.
- </p>
- <p>The filter supports the Peak Extend and Low-level Gain Adjustment features
- of HDCD, and detects the Transient Filter flag.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i HDCD16.flac -af hdcd OUT24.flac
- </pre></div>
- <p>When using the filter with wav, note the default encoding for wav is 16-bit,
- so the resulting 20-bit stream will be truncated back to 16-bit. Use something
- like <code class="command">-acodec pcm_s24le</code> after the filter to get 24-bit PCM output.
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i HDCD16.wav -af hdcd OUT16.wav
- ffmpeg -i HDCD16.wav -af hdcd -c:a pcm_s24le OUT24.wav
- </pre></div>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">disable_autoconvert</samp></dt>
- <dd><p>Disable any automatic format conversion or resampling in the filter graph.
- </p>
- </dd>
- <dt><samp class="option">process_stereo</samp></dt>
- <dd><p>Process the stereo channels together. If target_gain does not match between
- channels, consider it invalid and use the last valid target_gain.
- </p>
- </dd>
- <dt><samp class="option">cdt_ms</samp></dt>
- <dd><p>Set the code detect timer period in ms.
- </p>
- </dd>
- <dt><samp class="option">force_pe</samp></dt>
- <dd><p>Always extend peaks above -3dBFS even if PE isn’t signaled.
- </p>
- </dd>
- <dt><samp class="option">analyze_mode</samp></dt>
- <dd><p>Replace audio with a solid tone and adjust the amplitude to signal some
- specific aspect of the decoding process. The output file can be loaded in
- an audio editor alongside the original to aid analysis.
- </p>
- <p><code class="code">analyze_mode=pe:force_pe=true</code> can be used to see all samples above the PE level.
- </p>
- <p>Modes are:
- </p><dl class="table">
- <dt>‘<samp class="samp">0, off</samp>’</dt>
- <dd><p>Disabled
- </p></dd>
- <dt>‘<samp class="samp">1, lle</samp>’</dt>
- <dd><p>Gain adjustment level at each sample
- </p></dd>
- <dt>‘<samp class="samp">2, pe</samp>’</dt>
- <dd><p>Samples where peak extend occurs
- </p></dd>
- <dt>‘<samp class="samp">3, cdt</samp>’</dt>
- <dd><p>Samples where the code detect timer is active
- </p></dd>
- <dt>‘<samp class="samp">4, tgm</samp>’</dt>
- <dd><p>Samples where the target gain does not match between channels
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="headphone"></a>
- <h3 class="section">36.93 headphone<span class="pull-right"><a class="anchor hidden-xs" href="#headphone" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-headphone" aria-hidden="true">TOC</a></span></h3>
- <p>Apply head-related transfer functions (HRTFs) to create virtual
- loudspeakers around the user for binaural listening via headphones.
- The HRIRs are provided via additional streams, for each channel
- one stereo input stream is needed.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">map</samp></dt>
- <dd><p>Set mapping of input streams for convolution.
- The argument is a ’|’-separated list of channel names in order as they
- are given as additional stream inputs for filter.
- This also specify number of input streams. Number of input streams
- must be not less than number of channels in first stream plus one.
- </p>
- </dd>
- <dt><samp class="option">gain</samp></dt>
- <dd><p>Set gain applied to audio. Value is in dB. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set processing type. Can be <var class="var">time</var> or <var class="var">freq</var>. <var class="var">time</var> is
- processing audio in time domain which is slow.
- <var class="var">freq</var> is processing audio in frequency domain which is fast.
- Default is <var class="var">freq</var>.
- </p>
- </dd>
- <dt><samp class="option">lfe</samp></dt>
- <dd><p>Set custom gain for LFE channels. Value is in dB. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set size of frame in number of samples which will be processed at once.
- Default value is <var class="var">1024</var>. Allowed range is from 1024 to 96000.
- </p>
- </dd>
- <dt><samp class="option">hrir</samp></dt>
- <dd><p>Set format of hrir stream.
- Default value is <var class="var">stereo</var>. Alternative value is <var class="var">multich</var>.
- If value is set to <var class="var">stereo</var>, number of additional streams should
- be greater or equal to number of input channels in first input stream.
- Also each additional stream should have stereo number of channels.
- If value is set to <var class="var">multich</var>, number of additional streams should
- be exactly one. Also number of input channels of additional stream
- should be equal or greater than twice number of channels of first input
- stream.
- </p></dd>
- </dl>
- <a name="Examples-71"></a>
- <h4 class="subsection">36.93.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-71" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-71" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Full example using wav files as coefficients with amovie filters for 7.1 downmix,
- each amovie filter use stereo file with IR coefficients as input.
- The files give coefficients for each position of virtual loudspeaker:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.wav
- -filter_complex "amovie=azi_270_ele_0_DFC.wav[sr];amovie=azi_90_ele_0_DFC.wav[sl];amovie=azi_225_ele_0_DFC.wav[br];amovie=azi_135_ele_0_DFC.wav[bl];amovie=azi_0_ele_0_DFC.wav,asplit[fc][lfe];amovie=azi_35_ele_0_DFC.wav[fl];amovie=azi_325_ele_0_DFC.wav[fr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr]headphone=FL|FR|FC|LFE|BL|BR|SL|SR"
- output.wav
- </pre></div>
- </li><li>Full example using wav files as coefficients with amovie filters for 7.1 downmix,
- but now in <var class="var">multich</var> <var class="var">hrir</var> format.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.wav -filter_complex "amovie=minp.wav[hrirs];[0:a][hrirs]headphone=map=FL|FR|FC|LFE|BL|BR|SL|SR:hrir=multich"
- output.wav
- </pre></div>
- </li></ul>
- <a name="highpass"></a>
- <h3 class="section">36.94 highpass<span class="pull-right"><a class="anchor hidden-xs" href="#highpass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-highpass" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a high-pass filter with 3dB point frequency.
- The filter can be either single-pole, or double-pole (the default).
- The filter roll off at 6dB per pole per octave (20dB per pole per decade).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set frequency in Hz. Default is 3000.
- </p>
- </dd>
- <dt><samp class="option">poles, p</samp></dt>
- <dd><p>Set number of poles. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Specify the band-width of a filter in width_type units.
- Applies only to double-pole filter.
- The default is 0.707q and gives a Butterworth response.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-40"></a>
- <h4 class="subsection">36.94.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-40" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-40" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change highpass frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change highpass width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change highpass width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change highpass mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="join"></a>
- <h3 class="section">36.95 join<span class="pull-right"><a class="anchor hidden-xs" href="#join" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-join" aria-hidden="true">TOC</a></span></h3>
- <p>Join multiple input streams into one multi-channel stream.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>The number of input streams. It defaults to 2.
- </p>
- </dd>
- <dt><samp class="option">channel_layout</samp></dt>
- <dd><p>The desired output channel layout. It defaults to stereo.
- </p>
- </dd>
- <dt><samp class="option">map</samp></dt>
- <dd><p>Map channels from inputs to output. The argument is a ’|’-separated list of
- mappings, each in the <code class="code"><var class="var">input_idx</var>.<var class="var">in_channel</var>-<var class="var">out_channel</var></code>
- form. <var class="var">input_idx</var> is the 0-based index of the input stream. <var class="var">in_channel</var>
- can be either the name of the input channel (e.g. FL for front left) or its
- index in the specified input stream. <var class="var">out_channel</var> is the name of the output
- channel.
- </p></dd>
- </dl>
- <p>The filter will attempt to guess the mappings when they are not specified
- explicitly. It does so by first trying to find an unused matching input channel
- and if that fails it picks the first unused input channel.
- </p>
- <p>Join 3 inputs (with properly set channel layouts):
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex join=inputs=3 OUTPUT
- </pre></div>
- <p>Build a 5.1 output from 6 single-channel streams:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i fl -i fr -i fc -i sl -i sr -i lfe -filter_complex
- 'join=inputs=6:channel_layout=5.1:map=0.0-FL|1.0-FR|2.0-FC|3.0-SL|4.0-SR|5.0-LFE'
- out
- </pre></div>
- <a name="ladspa"></a>
- <h3 class="section">36.96 ladspa<span class="pull-right"><a class="anchor hidden-xs" href="#ladspa" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ladspa" aria-hidden="true">TOC</a></span></h3>
- <p>Load a LADSPA (Linux Audio Developer’s Simple Plugin API) plugin.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-ladspa</code>.
- </p>
- <dl class="table">
- <dt><samp class="option">file, f</samp></dt>
- <dd><p>Specifies the name of LADSPA plugin library to load. If the environment
- variable <code class="env">LADSPA_PATH</code> is defined, the LADSPA plugin is searched in
- each one of the directories specified by the colon separated list in
- <code class="env">LADSPA_PATH</code>, otherwise in the standard LADSPA paths, which are in
- this order: <samp class="file">HOME/.ladspa/lib/</samp>, <samp class="file">/usr/local/lib/ladspa/</samp>,
- <samp class="file">/usr/lib/ladspa/</samp>.
- </p>
- </dd>
- <dt><samp class="option">plugin, p</samp></dt>
- <dd><p>Specifies the plugin within the library. Some libraries contain only
- one plugin, but others contain many of them. If this is not set filter
- will list all available plugins within the specified library.
- </p>
- </dd>
- <dt><samp class="option">controls, c</samp></dt>
- <dd><p>Set the ’|’ separated list of controls which are zero or more floating point
- values that determine the behavior of the loaded plugin (for example delay,
- threshold or gain).
- Controls need to be defined using the following syntax:
- c0=<var class="var">value0</var>|c1=<var class="var">value1</var>|c2=<var class="var">value2</var>|..., where
- <var class="var">valuei</var> is the value set on the <var class="var">i</var>-th control.
- Alternatively they can be also defined using the following syntax:
- <var class="var">value0</var>|<var class="var">value1</var>|<var class="var">value2</var>|..., where
- <var class="var">valuei</var> is the value set on the <var class="var">i</var>-th control.
- If <samp class="option">controls</samp> is set to <code class="code">help</code>, all available controls and
- their valid ranges are printed.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, s</samp></dt>
- <dd><p>Specify the sample rate, default to 44100. Only used if plugin have
- zero inputs.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the number of samples per channel per each output frame, default
- is 1024. Only used if plugin have zero inputs.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the minimum duration of the sourced audio. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- Note that the resulting duration may be greater than the specified duration,
- as the generated audio is always cut at the end of a complete frame.
- If not specified, or the expressed duration is negative, the audio is
- supposed to be generated forever.
- Only used if plugin have zero inputs.
- </p>
- </dd>
- <dt><samp class="option">latency, l</samp></dt>
- <dd><p>Enable latency compensation, by default is disabled.
- Only used if plugin have inputs.
- </p></dd>
- </dl>
- <a name="Examples-72"></a>
- <h4 class="subsection">36.96.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-72" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-72" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>List all available plugins within amp (LADSPA example plugin) library:
- <div class="example">
- <pre class="example-preformatted">ladspa=file=amp
- </pre></div>
- </li><li>List all available controls and their valid ranges for <code class="code">vcf_notch</code>
- plugin from <code class="code">VCF</code> library:
- <div class="example">
- <pre class="example-preformatted">ladspa=f=vcf:p=vcf_notch:c=help
- </pre></div>
- </li><li>Simulate low quality audio equipment using <code class="code">Computer Music Toolkit</code> (CMT)
- plugin library:
- <div class="example">
- <pre class="example-preformatted">ladspa=file=cmt:plugin=lofi:controls=c0=22|c1=12|c2=12
- </pre></div>
- </li><li>Add reverberation to the audio using TAP-plugins
- (Tom’s Audio Processing plugins):
- <div class="example">
- <pre class="example-preformatted">ladspa=file=tap_reverb:tap_reverb
- </pre></div>
- </li><li>Generate white noise, with 0.2 amplitude:
- <div class="example">
- <pre class="example-preformatted">ladspa=file=cmt:noise_source_white:c=c0=.2
- </pre></div>
- </li><li>Generate 20 bpm clicks using plugin <code class="code">C* Click - Metronome</code> from the
- <code class="code">C* Audio Plugin Suite</code> (CAPS) library:
- <div class="example">
- <pre class="example-preformatted">ladspa=file=caps:Click:c=c1=20'
- </pre></div>
- </li><li>Apply <code class="code">C* Eq10X2 - Stereo 10-band equaliser</code> effect:
- <div class="example">
- <pre class="example-preformatted">ladspa=caps:Eq10X2:c=c0=-48|c9=-24|c3=12|c4=2
- </pre></div>
- </li><li>Increase volume by 20dB using fast lookahead limiter from Steve Harris
- <code class="code">SWH Plugins</code> collection:
- <div class="example">
- <pre class="example-preformatted">ladspa=fast_lookahead_limiter_1913:fastLookaheadLimiter:20|0|2
- </pre></div>
- </li><li>Attenuate low frequencies using Multiband EQ from Steve Harris
- <code class="code">SWH Plugins</code> collection:
- <div class="example">
- <pre class="example-preformatted">ladspa=mbeq_1197:mbeq:-24|-24|-24|0|0|0|0|0|0|0|0|0|0|0|0
- </pre></div>
- </li><li>Reduce stereo image using <code class="code">Narrower</code> from the <code class="code">C* Audio Plugin Suite</code>
- (CAPS) library:
- <div class="example">
- <pre class="example-preformatted">ladspa=caps:Narrower
- </pre></div>
- </li><li>Another white noise, now using <code class="code">C* Audio Plugin Suite</code> (CAPS) library:
- <div class="example">
- <pre class="example-preformatted">ladspa=caps:White:.2
- </pre></div>
- </li><li>Some fractal noise, using <code class="code">C* Audio Plugin Suite</code> (CAPS) library:
- <div class="example">
- <pre class="example-preformatted">ladspa=caps:Fractal:c=c1=1
- </pre></div>
- </li><li>Dynamic volume normalization using <code class="code">VLevel</code> plugin:
- <div class="example">
- <pre class="example-preformatted">ladspa=vlevel-ladspa:vlevel_mono
- </pre></div>
- </li></ul>
- <a name="Commands-41"></a>
- <h4 class="subsection">36.96.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-41" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-41" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">cN</samp></dt>
- <dd><p>Modify the <var class="var">N</var>-th control value.
- </p>
- <p>If the specified value is not valid, it is ignored and prior one is kept.
- </p></dd>
- </dl>
- <a name="loudnorm"></a>
- <h3 class="section">36.97 loudnorm<span class="pull-right"><a class="anchor hidden-xs" href="#loudnorm" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-loudnorm" aria-hidden="true">TOC</a></span></h3>
- <p>EBU R128 loudness normalization. Includes both dynamic and linear normalization modes.
- Support for both single pass (livestreams, files) and double pass (files) modes.
- This algorithm can target IL, LRA, and maximum true peak. In dynamic mode, to accurately
- detect true peaks, the audio stream will be upsampled to 192 kHz.
- Use the <code class="code">-ar</code> option or <code class="code">aresample</code> filter to explicitly set an output sample rate.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">I, i</samp></dt>
- <dd><p>Set integrated loudness target.
- Range is -70.0 - -5.0. Default value is -24.0.
- </p>
- </dd>
- <dt><samp class="option">LRA, lra</samp></dt>
- <dd><p>Set loudness range target.
- Range is 1.0 - 50.0. Default value is 7.0.
- </p>
- </dd>
- <dt><samp class="option">TP, tp</samp></dt>
- <dd><p>Set maximum true peak.
- Range is -9.0 - +0.0. Default value is -2.0.
- </p>
- </dd>
- <dt><samp class="option">measured_I, measured_i</samp></dt>
- <dd><p>Measured IL of input file.
- Range is -99.0 - +0.0.
- </p>
- </dd>
- <dt><samp class="option">measured_LRA, measured_lra</samp></dt>
- <dd><p>Measured LRA of input file.
- Range is 0.0 - 99.0.
- </p>
- </dd>
- <dt><samp class="option">measured_TP, measured_tp</samp></dt>
- <dd><p>Measured true peak of input file.
- Range is -99.0 - +99.0.
- </p>
- </dd>
- <dt><samp class="option">measured_thresh</samp></dt>
- <dd><p>Measured threshold of input file.
- Range is -99.0 - +0.0.
- </p>
- </dd>
- <dt><samp class="option">offset</samp></dt>
- <dd><p>Set offset gain. Gain is applied before the true-peak limiter.
- Range is -99.0 - +99.0. Default is +0.0.
- </p>
- </dd>
- <dt><samp class="option">linear</samp></dt>
- <dd><p>Normalize by linearly scaling the source audio.
- <code class="code">measured_I</code>, <code class="code">measured_LRA</code>, <code class="code">measured_TP</code>,
- and <code class="code">measured_thresh</code> must all be specified. Target LRA shouldn’t
- be lower than source LRA and the change in integrated loudness shouldn’t
- result in a true peak which exceeds the target TP. If any of these
- conditions aren’t met, normalization mode will revert to <var class="var">dynamic</var>.
- Options are <code class="code">true</code> or <code class="code">false</code>. Default is <code class="code">true</code>.
- </p>
- </dd>
- <dt><samp class="option">dual_mono</samp></dt>
- <dd><p>Treat mono input files as "dual-mono". If a mono file is intended for playback
- on a stereo system, its EBU R128 measurement will be perceptually incorrect.
- If set to <code class="code">true</code>, this option will compensate for this effect.
- Multi-channel input files are not affected by this option.
- Options are true or false. Default is false.
- </p>
- </dd>
- <dt><samp class="option">print_format</samp></dt>
- <dd><p>Set print format for stats. Options are summary, json, or none.
- Default value is none.
- </p></dd>
- </dl>
- <a name="lowpass"></a>
- <h3 class="section">36.98 lowpass<span class="pull-right"><a class="anchor hidden-xs" href="#lowpass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lowpass" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a low-pass filter with 3dB point frequency.
- The filter can be either single-pole or double-pole (the default).
- The filter roll off at 6dB per pole per octave (20dB per pole per decade).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set frequency in Hz. Default is 500.
- </p>
- </dd>
- <dt><samp class="option">poles, p</samp></dt>
- <dd><p>Set number of poles. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Specify the band-width of a filter in width_type units.
- Applies only to double-pole filter.
- The default is 0.707q and gives a Butterworth response.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Examples-73"></a>
- <h4 class="subsection">36.98.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-73" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-73" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Lowpass only LFE channel, it LFE is not present it does nothing:
- <div class="example">
- <pre class="example-preformatted">lowpass=c=LFE
- </pre></div>
- </li></ul>
- <a name="Commands-42"></a>
- <h4 class="subsection">36.98.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-42" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-42" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change lowpass frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change lowpass width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change lowpass width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change lowpass mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="lv2"></a>
- <h3 class="section">36.99 lv2<span class="pull-right"><a class="anchor hidden-xs" href="#lv2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lv2" aria-hidden="true">TOC</a></span></h3>
- <p>Load a LV2 (LADSPA Version 2) plugin.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-lv2</code>.
- </p>
- <dl class="table">
- <dt><samp class="option">plugin, p</samp></dt>
- <dd><p>Specifies the plugin URI. You may need to escape ’:’.
- </p>
- </dd>
- <dt><samp class="option">controls, c</samp></dt>
- <dd><p>Set the ’|’ separated list of controls which are zero or more floating point
- values that determine the behavior of the loaded plugin (for example delay,
- threshold or gain).
- If <samp class="option">controls</samp> is set to <code class="code">help</code>, all available controls and
- their valid ranges are printed.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, s</samp></dt>
- <dd><p>Specify the sample rate, default to 44100. Only used if plugin have
- zero inputs.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the number of samples per channel per each output frame, default
- is 1024. Only used if plugin have zero inputs.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the minimum duration of the sourced audio. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- Note that the resulting duration may be greater than the specified duration,
- as the generated audio is always cut at the end of a complete frame.
- If not specified, or the expressed duration is negative, the audio is
- supposed to be generated forever.
- Only used if plugin have zero inputs.
- </p></dd>
- </dl>
- <a name="Examples-74"></a>
- <h4 class="subsection">36.99.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-74" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-74" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply bass enhancer plugin from Calf:
- <div class="example">
- <pre class="example-preformatted">lv2=p=http\\\\://calf.sourceforge.net/plugins/BassEnhancer:c=amount=2
- </pre></div>
- </li><li>Apply vinyl plugin from Calf:
- <div class="example">
- <pre class="example-preformatted">lv2=p=http\\\\://calf.sourceforge.net/plugins/Vinyl:c=drone=0.2|aging=0.5
- </pre></div>
- </li><li>Apply bit crusher plugin from ArtyFX:
- <div class="example">
- <pre class="example-preformatted">lv2=p=http\\\\://www.openavproductions.com/artyfx#bitta:c=crush=0.3
- </pre></div>
- </li></ul>
- <a name="Commands-43"></a>
- <h4 class="subsection">36.99.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-43" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-43" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports all options that are exported by plugin as commands.
- </p>
- <a name="mcompand"></a>
- <h3 class="section">36.100 mcompand<span class="pull-right"><a class="anchor hidden-xs" href="#mcompand" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mcompand" aria-hidden="true">TOC</a></span></h3>
- <p>Multiband Compress or expand the audio’s dynamic range.
- </p>
- <p>The input audio is divided into bands using 4th order Linkwitz-Riley IIRs.
- This is akin to the crossover of a loudspeaker, and results in flat frequency
- response when absent compander action.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">args</samp></dt>
- <dd><p>This option syntax is:
- attack,decay,[attack,decay..] soft-knee points crossover_frequency [delay [initial_volume [gain]]] | attack,decay ...
- For explanation of each item refer to compand filter documentation.
- </p></dd>
- </dl>
- <a class="anchor" id="pan"></a><a name="pan-1"></a>
- <h3 class="section">36.101 pan<span class="pull-right"><a class="anchor hidden-xs" href="#pan-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pan-1" aria-hidden="true">TOC</a></span></h3>
- <p>Mix channels with specific gain levels. The filter accepts the output
- channel layout followed by a set of channels definitions.
- </p>
- <p>This filter is also designed to efficiently remap the channels of an audio
- stream.
- </p>
- <p>The filter accepts parameters of the form:
- "<var class="var">l</var>|<var class="var">outdef</var>|<var class="var">outdef</var>|..."
- </p>
- <dl class="table">
- <dt><samp class="option">l</samp></dt>
- <dd><p>output channel layout or number of channels
- </p>
- </dd>
- <dt><samp class="option">outdef</samp></dt>
- <dd><p>output channel specification, of the form:
- "<var class="var">out_name</var>=[<var class="var">gain</var>*]<var class="var">in_name</var>[(+-)[<var class="var">gain</var>*]<var class="var">in_name</var>...]"
- </p>
- </dd>
- <dt><samp class="option">out_name</samp></dt>
- <dd><p>output channel to define, either a channel name (FL, FR, etc.) or a channel
- number (c0, c1, etc.)
- </p>
- </dd>
- <dt><samp class="option">gain</samp></dt>
- <dd><p>multiplicative coefficient for the channel, 1 leaving the volume unchanged
- </p>
- </dd>
- <dt><samp class="option">in_name</samp></dt>
- <dd><p>input channel to use, see out_name for details; it is not possible to mix
- named and numbered input channels
- </p></dd>
- </dl>
- <p>If the ‘=’ in a channel specification is replaced by ‘<’, then the gains for
- that specification will be renormalized so that the total is 1, thus
- avoiding clipping noise.
- </p>
- <a name="Mixing-examples"></a>
- <h4 class="subsection">36.101.1 Mixing examples<span class="pull-right"><a class="anchor hidden-xs" href="#Mixing-examples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Mixing-examples" aria-hidden="true">TOC</a></span></h4>
- <p>For example, if you want to down-mix from stereo to mono, but with a bigger
- factor for the left channel:
- </p><div class="example">
- <pre class="example-preformatted">pan=1c|c0=0.9*c0+0.1*c1
- </pre></div>
- <p>A customized down-mix to stereo that works automatically for 3-, 4-, 5- and
- 7-channels surround:
- </p><div class="example">
- <pre class="example-preformatted">pan=stereo| FL < FL + 0.5*FC + 0.6*BL + 0.6*SL | FR < FR + 0.5*FC + 0.6*BR + 0.6*SR
- </pre></div>
- <p>Note that <code class="command">ffmpeg</code> integrates a default down-mix (and up-mix) system
- that should be preferred (see "-ac" option) unless you have very specific
- needs.
- </p>
- <a name="Remapping-examples"></a>
- <h4 class="subsection">36.101.2 Remapping examples<span class="pull-right"><a class="anchor hidden-xs" href="#Remapping-examples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Remapping-examples" aria-hidden="true">TOC</a></span></h4>
- <p>The channel remapping will be effective if, and only if:
- </p>
- <ul class="itemize mark-bullet">
- <li>gain coefficients are zeroes or ones,
- </li><li>only one input per channel output,
- </li></ul>
- <p>If all these conditions are satisfied, the filter will notify the user ("Pure
- channel mapping detected"), and use an optimized and lossless method to do the
- remapping.
- </p>
- <p>For example, if you have a 5.1 source and want a stereo audio stream by
- dropping the extra channels:
- </p><div class="example">
- <pre class="example-preformatted">pan="stereo| c0=FL | c1=FR"
- </pre></div>
- <p>Given the same source, you can also switch front left and front right channels
- and keep the input channel layout:
- </p><div class="example">
- <pre class="example-preformatted">pan="5.1| c0=c1 | c1=c0 | c2=c2 | c3=c3 | c4=c4 | c5=c5"
- </pre></div>
- <p>If the input is a stereo audio stream, you can mute the front left channel (and
- still keep the stereo channel layout) with:
- </p><div class="example">
- <pre class="example-preformatted">pan="stereo|c1=c1"
- </pre></div>
- <p>Still with a stereo audio stream input, you can copy the right channel in both
- front left and right:
- </p><div class="example">
- <pre class="example-preformatted">pan="stereo| c0=FR | c1=FR"
- </pre></div>
- <a name="replaygain"></a>
- <h3 class="section">36.102 replaygain<span class="pull-right"><a class="anchor hidden-xs" href="#replaygain" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-replaygain" aria-hidden="true">TOC</a></span></h3>
- <p>ReplayGain scanner filter. This filter takes an audio stream as an input and
- outputs it unchanged.
- At end of filtering it displays <code class="code">track_gain</code> and <code class="code">track_peak</code>.
- </p>
- <p>The filter accepts the following exported read-only options:
- </p>
- <dl class="table">
- <dt><samp class="option">track_gain</samp></dt>
- <dd><p>Exported track gain in dB at end of stream.
- </p>
- </dd>
- <dt><samp class="option">track_peak</samp></dt>
- <dd><p>Exported track peak at end of stream.
- </p></dd>
- </dl>
- <a name="resample"></a>
- <h3 class="section">36.103 resample<span class="pull-right"><a class="anchor hidden-xs" href="#resample" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-resample" aria-hidden="true">TOC</a></span></h3>
- <p>Convert the audio sample format, sample rate and channel layout. It is
- not meant to be used directly.
- </p>
- <a name="rubberband"></a>
- <h3 class="section">36.104 rubberband<span class="pull-right"><a class="anchor hidden-xs" href="#rubberband" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rubberband" aria-hidden="true">TOC</a></span></h3>
- <p>Apply time-stretching and pitch-shifting with librubberband.
- </p>
- <p>To enable compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-librubberband</code>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">tempo</samp></dt>
- <dd><p>Set tempo scale factor.
- </p>
- </dd>
- <dt><samp class="option">pitch</samp></dt>
- <dd><p>Set pitch scale factor.
- </p>
- </dd>
- <dt><samp class="option">transients</samp></dt>
- <dd><p>Set transients detector.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">crisp</var></dt>
- <dt><var class="var">mixed</var></dt>
- <dt><var class="var">smooth</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">detector</samp></dt>
- <dd><p>Set detector.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">compound</var></dt>
- <dt><var class="var">percussive</var></dt>
- <dt><var class="var">soft</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">phase</samp></dt>
- <dd><p>Set phase.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">laminar</var></dt>
- <dt><var class="var">independent</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">window</samp></dt>
- <dd><p>Set processing window size.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">standard</var></dt>
- <dt><var class="var">short</var></dt>
- <dt><var class="var">long</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">smoothing</samp></dt>
- <dd><p>Set smoothing.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">off</var></dt>
- <dt><var class="var">on</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">formant</samp></dt>
- <dd><p>Enable formant preservation when shift pitching.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">shifted</var></dt>
- <dt><var class="var">preserved</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">pitchq</samp></dt>
- <dd><p>Set pitch quality.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">quality</var></dt>
- <dt><var class="var">speed</var></dt>
- <dt><var class="var">consistency</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set channels.
- Possible values are:
- </p><dl class="table">
- <dt><var class="var">apart</var></dt>
- <dt><var class="var">together</var></dt>
- </dl>
- </dd>
- </dl>
- <a name="Commands-44"></a>
- <h4 class="subsection">36.104.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-44" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-44" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">tempo</samp></dt>
- <dd><p>Change filter tempo scale factor.
- Syntax for the command is : "<var class="var">tempo</var>"
- </p>
- </dd>
- <dt><samp class="option">pitch</samp></dt>
- <dd><p>Change filter pitch scale factor.
- Syntax for the command is : "<var class="var">pitch</var>"
- </p></dd>
- </dl>
- <a name="sidechaincompress"></a>
- <h3 class="section">36.105 sidechaincompress<span class="pull-right"><a class="anchor hidden-xs" href="#sidechaincompress" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sidechaincompress" aria-hidden="true">TOC</a></span></h3>
- <p>This filter acts like normal compressor but has the ability to compress
- detected signal using second input signal.
- It needs two input streams and returns one output stream.
- First input stream will be processed depending on second stream signal.
- The filtered signal then can be filtered with other filters in later stages of
- processing. See <a class="ref" href="#pan">pan</a> and <a class="ref" href="#amerge">amerge</a> filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input gain. Default is 1. Range is between 0.015625 and 64.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set mode of compressor operation. Can be <code class="code">upward</code> or <code class="code">downward</code>.
- Default is <code class="code">downward</code>.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>If a signal of second stream raises above this level it will affect the gain
- reduction of first stream.
- By default is 0.125. Range is between 0.00097563 and 1.
- </p>
- </dd>
- <dt><samp class="option">ratio</samp></dt>
- <dd><p>Set a ratio about which the signal is reduced. 1:2 means that if the level
- raised 4dB above the threshold, it will be only 2dB above after the reduction.
- Default is 2. Range is between 1 and 20.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Amount of milliseconds the signal has to rise above the threshold before gain
- reduction starts. Default is 20. Range is between 0.01 and 2000.
- </p>
- </dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Amount of milliseconds the signal has to fall below the threshold before
- reduction is decreased again. Default is 250. Range is between 0.01 and 9000.
- </p>
- </dd>
- <dt><samp class="option">makeup</samp></dt>
- <dd><p>Set the amount by how much signal will be amplified after processing.
- Default is 1. Range is from 1 to 64.
- </p>
- </dd>
- <dt><samp class="option">knee</samp></dt>
- <dd><p>Curve the sharp knee around the threshold to enter gain reduction more softly.
- Default is 2.82843. Range is between 1 and 8.
- </p>
- </dd>
- <dt><samp class="option">link</samp></dt>
- <dd><p>Choose if the <code class="code">average</code> level between all channels of side-chain stream
- or the louder(<code class="code">maximum</code>) channel of side-chain stream affects the
- reduction. Default is <code class="code">average</code>.
- </p>
- </dd>
- <dt><samp class="option">detection</samp></dt>
- <dd><p>Should the exact signal be taken in case of <code class="code">peak</code> or an RMS one in case
- of <code class="code">rms</code>. Default is <code class="code">rms</code> which is mainly smoother.
- </p>
- </dd>
- <dt><samp class="option">level_sc</samp></dt>
- <dd><p>Set sidechain gain. Default is 1. Range is between 0.015625 and 64.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>How much to use compressed signal in output. Default is 1.
- Range is between 0 and 1.
- </p></dd>
- </dl>
- <a name="Commands-45"></a>
- <h4 class="subsection">36.105.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-45" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-45" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-75"></a>
- <h4 class="subsection">36.105.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-75" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-75" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Full ffmpeg example taking 2 audio inputs, 1st input to be compressed
- depending on the signal of 2nd input and later compressed signal to be
- merged with 2nd input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.flac -i sidechain.flac -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress[compr];[compr][mix]amerge"
- </pre></div>
- </li></ul>
- <a name="sidechaingate"></a>
- <h3 class="section">36.106 sidechaingate<span class="pull-right"><a class="anchor hidden-xs" href="#sidechaingate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sidechaingate" aria-hidden="true">TOC</a></span></h3>
- <p>A sidechain gate acts like a normal (wideband) gate but has the ability to
- filter the detected signal before sending it to the gain reduction stage.
- Normally a gate uses the full range signal to detect a level above the
- threshold.
- For example: If you cut all lower frequencies from your sidechain signal
- the gate will decrease the volume of your track only if not enough highs
- appear. With this technique you are able to reduce the resonation of a
- natural drum or remove "rumbling" of muted strokes from a heavily distorted
- guitar.
- It needs two input streams and returns one output stream.
- First input stream will be processed depending on second stream signal.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input level before filtering.
- Default is 1. Allowed range is from 0.015625 to 64.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the mode of operation. Can be <code class="code">upward</code> or <code class="code">downward</code>.
- Default is <code class="code">downward</code>. If set to <code class="code">upward</code> mode, higher parts of signal
- will be amplified, expanding dynamic range in upward direction.
- Otherwise, in case of <code class="code">downward</code> lower parts of signal will be reduced.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Set the level of gain reduction when the signal is below the threshold.
- Default is 0.06125. Allowed range is from 0 to 1.
- Setting this to 0 disables reduction and then filter behaves like expander.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>If a signal rises above this level the gain reduction is released.
- Default is 0.125. Allowed range is from 0 to 1.
- </p>
- </dd>
- <dt><samp class="option">ratio</samp></dt>
- <dd><p>Set a ratio about which the signal is reduced.
- Default is 2. Allowed range is from 1 to 9000.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Amount of milliseconds the signal has to rise above the threshold before gain
- reduction stops.
- Default is 20 milliseconds. Allowed range is from 0.01 to 9000.
- </p>
- </dd>
- <dt><samp class="option">release</samp></dt>
- <dd><p>Amount of milliseconds the signal has to fall below the threshold before the
- reduction is increased again. Default is 250 milliseconds.
- Allowed range is from 0.01 to 9000.
- </p>
- </dd>
- <dt><samp class="option">makeup</samp></dt>
- <dd><p>Set amount of amplification of signal after processing.
- Default is 1. Allowed range is from 1 to 64.
- </p>
- </dd>
- <dt><samp class="option">knee</samp></dt>
- <dd><p>Curve the sharp knee around the threshold to enter gain reduction more softly.
- Default is 2.828427125. Allowed range is from 1 to 8.
- </p>
- </dd>
- <dt><samp class="option">detection</samp></dt>
- <dd><p>Choose if exact signal should be taken for detection or an RMS like one.
- Default is rms. Can be peak or rms.
- </p>
- </dd>
- <dt><samp class="option">link</samp></dt>
- <dd><p>Choose if the average level between all channels or the louder channel affects
- the reduction.
- Default is average. Can be average or maximum.
- </p>
- </dd>
- <dt><samp class="option">level_sc</samp></dt>
- <dd><p>Set sidechain gain. Default is 1. Range is from 0.015625 to 64.
- </p></dd>
- </dl>
- <a name="Commands-46"></a>
- <h4 class="subsection">36.106.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-46" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-46" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="silencedetect"></a>
- <h3 class="section">36.107 silencedetect<span class="pull-right"><a class="anchor hidden-xs" href="#silencedetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-silencedetect" aria-hidden="true">TOC</a></span></h3>
- <p>Detect silence in an audio stream.
- </p>
- <p>This filter logs a message when it detects that the input audio volume is less
- or equal to a noise tolerance value for a duration greater or equal to the
- minimum detected noise duration.
- </p>
- <p>The printed times and duration are expressed in seconds. The
- <code class="code">lavfi.silence_start</code> or <code class="code">lavfi.silence_start.X</code> metadata key
- is set on the first frame whose timestamp equals or exceeds the detection
- duration and it contains the timestamp of the first frame of the silence.
- </p>
- <p>The <code class="code">lavfi.silence_duration</code> or <code class="code">lavfi.silence_duration.X</code>
- and <code class="code">lavfi.silence_end</code> or <code class="code">lavfi.silence_end.X</code> metadata
- keys are set on the first frame after the silence. If <samp class="option">mono</samp> is
- enabled, and each channel is evaluated separately, the <code class="code">.X</code>
- suffixed keys are used, and <code class="code">X</code> corresponds to the channel number.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">noise, n</samp></dt>
- <dd><p>Set noise tolerance. Can be specified in dB (in case "dB" is appended to the
- specified value) or amplitude ratio. Default is -60dB, or 0.001.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set silence duration until notification (default is 2 seconds). See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- </dd>
- <dt><samp class="option">mono, m</samp></dt>
- <dd><p>Process each channel separately, instead of combined. By default is disabled.
- </p></dd>
- </dl>
- <a name="Examples-76"></a>
- <h4 class="subsection">36.107.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-76" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-76" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Detect 5 seconds of silence with -50dB noise tolerance:
- <div class="example">
- <pre class="example-preformatted">silencedetect=n=-50dB:d=5
- </pre></div>
- </li><li>Complete example with <code class="command">ffmpeg</code> to detect silence with 0.0001 noise
- tolerance in <samp class="file">silence.mp3</samp>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i silence.mp3 -af silencedetect=noise=0.0001 -f null -
- </pre></div>
- </li></ul>
- <a name="silenceremove"></a>
- <h3 class="section">36.108 silenceremove<span class="pull-right"><a class="anchor hidden-xs" href="#silenceremove" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-silenceremove" aria-hidden="true">TOC</a></span></h3>
- <p>Remove silence from the beginning, middle or end of the audio.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">start_periods</samp></dt>
- <dd><p>This value is used to indicate if audio should be trimmed at beginning of
- the audio. A value of zero indicates no silence should be trimmed from the
- beginning. When specifying a non-zero value, it trims audio up until it
- finds non-silence. Normally, when trimming silence from beginning of audio
- the <var class="var">start_periods</var> will be <code class="code">1</code> but it can be increased to higher
- values to trim all audio up to specific count of non-silence periods.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">start_duration</samp></dt>
- <dd><p>Specify the amount of time that non-silence must be detected before it stops
- trimming audio. By increasing the duration, bursts of noises can be treated
- as silence and trimmed off. Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">start_threshold</samp></dt>
- <dd><p>This indicates what sample value should be treated as silence. For digital
- audio, a value of <code class="code">0</code> may be fine but for audio recorded from analog,
- you may wish to increase the value to account for background noise.
- Can be specified in dB (in case "dB" is appended to the specified value)
- or amplitude ratio. Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">start_silence</samp></dt>
- <dd><p>Specify max duration of silence at beginning that will be kept after
- trimming. Default is 0, which is equal to trimming all samples detected
- as silence.
- </p>
- </dd>
- <dt><samp class="option">start_mode</samp></dt>
- <dd><p>Specify mode of detection of silence end at start of multi-channel audio.
- Can be <var class="var">any</var> or <var class="var">all</var>. Default is <var class="var">any</var>.
- With <var class="var">any</var>, any sample from any channel that is detected as non-silence
- will trigger end of silence trimming at start of audio stream.
- With <var class="var">all</var>, only if every sample from every channel is detected as non-silence
- will trigger end of silence trimming at start of audio stream, limited usage.
- </p>
- </dd>
- <dt><samp class="option">stop_periods</samp></dt>
- <dd><p>Set the count for trimming silence from the end of audio. When specifying a
- positive value, it trims audio after it finds specified silence period.
- To remove silence from the middle of a file, specify a <var class="var">stop_periods</var>
- that is negative. This value is then treated as a positive value and is
- used to indicate the effect should restart processing as specified by
- <var class="var">stop_periods</var>, making it suitable for removing periods of silence
- in the middle of the audio.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">stop_duration</samp></dt>
- <dd><p>Specify a duration of silence that must exist before audio is not copied any
- more. By specifying a higher duration, silence that is wanted can be left in
- the audio.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">stop_threshold</samp></dt>
- <dd><p>This is the same as <samp class="option">start_threshold</samp> but for trimming silence from
- the end of audio.
- Can be specified in dB (in case "dB" is appended to the specified value)
- or amplitude ratio. Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">stop_silence</samp></dt>
- <dd><p>Specify max duration of silence at end that will be kept after
- trimming. Default is 0, which is equal to trimming all samples detected
- as silence.
- </p>
- </dd>
- <dt><samp class="option">stop_mode</samp></dt>
- <dd><p>Specify mode of detection of silence start after start of multi-channel audio.
- Can be <var class="var">any</var> or <var class="var">all</var>. Default is <var class="var">all</var>.
- With <var class="var">any</var>, any sample from any channel that is detected as silence
- will trigger start of silence trimming after start of audio stream, limited usage.
- With <var class="var">all</var>, only if every sample from every channel is detected as silence
- will trigger start of silence trimming after start of audio stream.
- </p>
- </dd>
- <dt><samp class="option">detection</samp></dt>
- <dd><p>Set how is silence detected.
- </p><dl class="table">
- <dt><samp class="option">avg</samp></dt>
- <dd><p>Mean of absolute values of samples in moving window.
- </p></dd>
- <dt><samp class="option">rms</samp></dt>
- <dd><p>Root squared mean of absolute values of samples in moving window.
- </p></dd>
- <dt><samp class="option">peak</samp></dt>
- <dd><p>Maximum of absolute values of samples in moving window.
- </p></dd>
- <dt><samp class="option">median</samp></dt>
- <dd><p>Median of absolute values of samples in moving window.
- </p></dd>
- <dt><samp class="option">ptp</samp></dt>
- <dd><p>Absolute of max peak to min peak difference of samples in moving window.
- </p></dd>
- <dt><samp class="option">dev</samp></dt>
- <dd><p>Standard deviation of values of samples in moving window.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">rms</code>.
- </p>
- </dd>
- <dt><samp class="option">window</samp></dt>
- <dd><p>Set duration in number of seconds used to calculate size of window in number
- of samples for detecting silence. Using <code class="code">0</code> will effectively disable
- any windowing and use only single sample per channel for silence detection.
- In that case it may be needed to also set <samp class="option">start_silence</samp> and/or
- <samp class="option">stop_silence</samp> to nonzero values with also <samp class="option">start_duration</samp> and/or
- <samp class="option">stop_duration</samp> to nonzero values.
- Default value is <code class="code">0.02</code>. Allowed range is from <code class="code">0</code> to <code class="code">10</code>.
- </p>
- </dd>
- <dt><samp class="option">timestamp</samp></dt>
- <dd><p>Set processing mode of every audio frame output timestamp.
- </p><dl class="table">
- <dt><samp class="option">write</samp></dt>
- <dd><p>Full timestamps rewrite, keep only the start time for the first output frame.
- </p></dd>
- <dt><samp class="option">copy</samp></dt>
- <dd><p>Non-dropped frames are left with same timestamp as input audio frame.
- </p></dd>
- </dl>
- <p>Defaults value is <code class="code">write</code>.
- </p></dd>
- </dl>
- <a name="Examples-77"></a>
- <h4 class="subsection">36.108.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-77" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-77" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>The following example shows how this filter can be used to start a recording
- that does not contain the delay at the start which usually occurs between
- pressing the record button and the start of the performance:
- <div class="example">
- <pre class="example-preformatted">silenceremove=start_periods=1:start_duration=5:start_threshold=0.02
- </pre></div>
- </li><li>Trim all silence encountered from beginning to end where there is more than 1
- second of silence in audio:
- <div class="example">
- <pre class="example-preformatted">silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-90dB
- </pre></div>
- </li><li>Trim all digital silence samples, using peak detection, from beginning to end
- where there is more than 0 samples of digital silence in audio and digital
- silence is detected in all channels at same positions in stream:
- <div class="example">
- <pre class="example-preformatted">silenceremove=window=0:detection=peak:stop_mode=all:start_mode=all:stop_periods=-1:stop_threshold=0
- </pre></div>
- </li><li>Trim every 2nd encountered silence period from beginning to end where there is
- more than 1 second of silence per silence period in audio:
- <div class="example">
- <pre class="example-preformatted">silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB
- </pre></div>
- </li><li>Similar as above, but keep maximum of 0.5 seconds of silence from each trimmed period:
- <div class="example">
- <pre class="example-preformatted">silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5
- </pre></div>
- </li><li>Similar as above, but keep maximum of 1.5 seconds of silence from start of audio:
- <div class="example">
- <pre class="example-preformatted">silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5:start_periods=1:start_duration=1:start_silence=1.5:stop_threshold=-90dB
- </pre></div>
- </li></ul>
- <a name="Commands-47"></a>
- <h4 class="subsection">36.108.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-47" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-47" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports some above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="sofalizer"></a>
- <h3 class="section">36.109 sofalizer<span class="pull-right"><a class="anchor hidden-xs" href="#sofalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sofalizer" aria-hidden="true">TOC</a></span></h3>
- <p>SOFAlizer uses head-related transfer functions (HRTFs) to create virtual
- loudspeakers around the user for binaural listening via headphones (audio
- formats up to 9 channels supported).
- The HRTFs are stored in SOFA files (see <a class="url" href="http://www.sofacoustics.org/">http://www.sofacoustics.org/</a> for a database).
- SOFAlizer is developed at the Acoustics Research Institute (ARI) of the
- Austrian Academy of Sciences.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-libmysofa</code>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sofa</samp></dt>
- <dd><p>Set the SOFA file used for rendering.
- </p>
- </dd>
- <dt><samp class="option">gain</samp></dt>
- <dd><p>Set gain applied to audio. Value is in dB. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">rotation</samp></dt>
- <dd><p>Set rotation of virtual loudspeakers in deg. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">elevation</samp></dt>
- <dd><p>Set elevation of virtual speakers in deg. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set distance in meters between loudspeakers and the listener with near-field
- HRTFs. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set processing type. Can be <var class="var">time</var> or <var class="var">freq</var>. <var class="var">time</var> is
- processing audio in time domain which is slow.
- <var class="var">freq</var> is processing audio in frequency domain which is fast.
- Default is <var class="var">freq</var>.
- </p>
- </dd>
- <dt><samp class="option">speakers</samp></dt>
- <dd><p>Set custom positions of virtual loudspeakers. Syntax for this option is:
- <CH> <AZIM> <ELEV>[|<CH> <AZIM> <ELEV>|...].
- Each virtual loudspeaker is described with short channel name following with
- azimuth and elevation in degrees.
- Each virtual loudspeaker description is separated by ’|’.
- For example to override front left and front right channel positions use:
- ’speakers=FL 45 15|FR 345 15’.
- Descriptions with unrecognised channel names are ignored.
- </p>
- </dd>
- <dt><samp class="option">lfegain</samp></dt>
- <dd><p>Set custom gain for LFE channels. Value is in dB. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">framesize</samp></dt>
- <dd><p>Set custom frame size in number of samples. Default is 1024.
- Allowed range is from 1024 to 96000. Only used if option ‘<samp class="samp">type</samp>’
- is set to <var class="var">freq</var>.
- </p>
- </dd>
- <dt><samp class="option">normalize</samp></dt>
- <dd><p>Should all IRs be normalized upon importing SOFA file.
- By default is enabled.
- </p>
- </dd>
- <dt><samp class="option">interpolate</samp></dt>
- <dd><p>Should nearest IRs be interpolated with neighbor IRs if exact position
- does not match. By default is disabled.
- </p>
- </dd>
- <dt><samp class="option">minphase</samp></dt>
- <dd><p>Minphase all IRs upon loading of SOFA file. By default is disabled.
- </p>
- </dd>
- <dt><samp class="option">anglestep</samp></dt>
- <dd><p>Set neighbor search angle step. Only used if option <var class="var">interpolate</var> is enabled.
- </p>
- </dd>
- <dt><samp class="option">radstep</samp></dt>
- <dd><p>Set neighbor search radius step. Only used if option <var class="var">interpolate</var> is enabled.
- </p></dd>
- </dl>
- <a name="Examples-78"></a>
- <h4 class="subsection">36.109.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-78" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-78" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Using ClubFritz6 sofa file:
- <div class="example">
- <pre class="example-preformatted">sofalizer=sofa=/path/to/ClubFritz6.sofa:type=freq:radius=1
- </pre></div>
- </li><li>Using ClubFritz12 sofa file and bigger radius with small rotation:
- <div class="example">
- <pre class="example-preformatted">sofalizer=sofa=/path/to/ClubFritz12.sofa:type=freq:radius=2:rotation=5
- </pre></div>
- </li><li>Similar as above but with custom speaker positions for front left, front right, back left and back right
- and also with custom gain:
- <div class="example">
- <pre class="example-preformatted">"sofalizer=sofa=/path/to/ClubFritz6.sofa:type=freq:radius=2:speakers=FL 45|FR 315|BL 135|BR 225:gain=28"
- </pre></div>
- </li></ul>
- <a name="speechnorm"></a>
- <h3 class="section">36.110 speechnorm<span class="pull-right"><a class="anchor hidden-xs" href="#speechnorm" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-speechnorm" aria-hidden="true">TOC</a></span></h3>
- <p>Speech Normalizer.
- </p>
- <p>This filter expands or compresses each half-cycle of audio samples
- (local set of samples all above or all below zero and between two nearest zero crossings) depending
- on threshold value, so audio reaches target peak value under conditions controlled by below options.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">peak, p</samp></dt>
- <dd><p>Set the expansion target peak value. This specifies the highest allowed absolute amplitude
- level for the normalized audio input. Default value is 0.95. Allowed range is from 0.0 to 1.0.
- </p>
- </dd>
- <dt><samp class="option">expansion, e</samp></dt>
- <dd><p>Set the maximum expansion factor. Allowed range is from 1.0 to 50.0. Default value is 2.0.
- This option controls maximum local half-cycle of samples expansion. The maximum expansion
- would be such that local peak value reaches target peak value but never to surpass it and that
- ratio between new and previous peak value does not surpass this option value.
- </p>
- </dd>
- <dt><samp class="option">compression, c</samp></dt>
- <dd><p>Set the maximum compression factor. Allowed range is from 1.0 to 50.0. Default value is 2.0.
- This option controls maximum local half-cycle of samples compression. This option is used
- only if <samp class="option">threshold</samp> option is set to value greater than 0.0, then in such cases
- when local peak is lower or same as value set by <samp class="option">threshold</samp> all samples belonging to
- that peak’s half-cycle will be compressed by current compression factor.
- </p>
- </dd>
- <dt><samp class="option">threshold, t</samp></dt>
- <dd><p>Set the threshold value. Default value is 0.0. Allowed range is from 0.0 to 1.0.
- This option specifies which half-cycles of samples will be compressed and which will be expanded.
- Any half-cycle samples with their local peak value below or same as this option value will be
- compressed by current compression factor, otherwise, if greater than threshold value they will be
- expanded with expansion factor so that it could reach peak target value but never surpass it.
- </p>
- </dd>
- <dt><samp class="option">raise, r</samp></dt>
- <dd><p>Set the expansion raising amount per each half-cycle of samples. Default value is 0.001.
- Allowed range is from 0.0 to 1.0. This controls how fast expansion factor is raised per
- each new half-cycle until it reaches <samp class="option">expansion</samp> value.
- Setting this options too high may lead to distortions.
- </p>
- </dd>
- <dt><samp class="option">fall, f</samp></dt>
- <dd><p>Set the compression raising amount per each half-cycle of samples. Default value is 0.001.
- Allowed range is from 0.0 to 1.0. This controls how fast compression factor is raised per
- each new half-cycle until it reaches <samp class="option">compression</samp> value.
- </p>
- </dd>
- <dt><samp class="option">channels, h</samp></dt>
- <dd><p>Specify which channels to filter, by default all available channels are filtered.
- </p>
- </dd>
- <dt><samp class="option">invert, i</samp></dt>
- <dd><p>Enable inverted filtering, by default is disabled. This inverts interpretation of <samp class="option">threshold</samp>
- option. When enabled any half-cycle of samples with their local peak value below or same as
- <samp class="option">threshold</samp> option will be expanded otherwise it will be compressed.
- </p>
- </dd>
- <dt><samp class="option">link, l</samp></dt>
- <dd><p>Link channels when calculating gain applied to each filtered channel sample, by default is disabled.
- When disabled each filtered channel gain calculation is independent, otherwise when this option
- is enabled the minimum of all possible gains for each filtered channel is used.
- </p>
- </dd>
- <dt><samp class="option">rms, m</samp></dt>
- <dd><p>Set the expansion target RMS value. This specifies the highest allowed RMS level for the normalized
- audio input. Default value is 0.0, thus disabled. Allowed range is from 0.0 to 1.0.
- </p></dd>
- </dl>
- <a name="Commands-48"></a>
- <h4 class="subsection">36.110.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-48" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-48" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-79"></a>
- <h4 class="subsection">36.110.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-79" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-79" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Weak and slow amplification:
- <div class="example">
- <pre class="example-preformatted">speechnorm=e=3:r=0.00001:l=1
- </pre></div>
- </li><li>Moderate and slow amplification:
- <div class="example">
- <pre class="example-preformatted">speechnorm=e=6.25:r=0.00001:l=1
- </pre></div>
- </li><li>Strong and fast amplification:
- <div class="example">
- <pre class="example-preformatted">speechnorm=e=12.5:r=0.0001:l=1
- </pre></div>
- </li><li>Very strong and fast amplification:
- <div class="example">
- <pre class="example-preformatted">speechnorm=e=25:r=0.0001:l=1
- </pre></div>
- </li><li>Extreme and fast amplification:
- <div class="example">
- <pre class="example-preformatted">speechnorm=e=50:r=0.0001:l=1
- </pre></div>
- </li></ul>
- <a name="stereotools"></a>
- <h3 class="section">36.111 stereotools<span class="pull-right"><a class="anchor hidden-xs" href="#stereotools" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-stereotools" aria-hidden="true">TOC</a></span></h3>
- <p>This filter has some handy utilities to manage stereo signals, for converting
- M/S stereo recordings to L/R signal while having control over the parameters
- or spreading the stereo image of master track.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input level before filtering for both channels. Defaults is 1.
- Allowed range is from 0.015625 to 64.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output level after filtering for both channels. Defaults is 1.
- Allowed range is from 0.015625 to 64.
- </p>
- </dd>
- <dt><samp class="option">balance_in</samp></dt>
- <dd><p>Set input balance between both channels. Default is 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">balance_out</samp></dt>
- <dd><p>Set output balance between both channels. Default is 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">softclip</samp></dt>
- <dd><p>Enable softclipping. Results in analog distortion instead of harsh digital 0dB
- clipping. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">mutel</samp></dt>
- <dd><p>Mute the left channel. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">muter</samp></dt>
- <dd><p>Mute the right channel. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">phasel</samp></dt>
- <dd><p>Change the phase of the left channel. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">phaser</samp></dt>
- <dd><p>Change the phase of the right channel. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set stereo mode. Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">lr>lr</samp>’</dt>
- <dd><p>Left/Right to Left/Right, this is default.
- </p>
- </dd>
- <dt>‘<samp class="samp">lr>ms</samp>’</dt>
- <dd><p>Left/Right to Mid/Side.
- </p>
- </dd>
- <dt>‘<samp class="samp">ms>lr</samp>’</dt>
- <dd><p>Mid/Side to Left/Right.
- </p>
- </dd>
- <dt>‘<samp class="samp">lr>ll</samp>’</dt>
- <dd><p>Left/Right to Left/Left.
- </p>
- </dd>
- <dt>‘<samp class="samp">lr>rr</samp>’</dt>
- <dd><p>Left/Right to Right/Right.
- </p>
- </dd>
- <dt>‘<samp class="samp">lr>l+r</samp>’</dt>
- <dd><p>Left/Right to Left + Right.
- </p>
- </dd>
- <dt>‘<samp class="samp">lr>rl</samp>’</dt>
- <dd><p>Left/Right to Right/Left.
- </p>
- </dd>
- <dt>‘<samp class="samp">ms>ll</samp>’</dt>
- <dd><p>Mid/Side to Left/Left.
- </p>
- </dd>
- <dt>‘<samp class="samp">ms>rr</samp>’</dt>
- <dd><p>Mid/Side to Right/Right.
- </p>
- </dd>
- <dt>‘<samp class="samp">ms>rl</samp>’</dt>
- <dd><p>Mid/Side to Right/Left.
- </p>
- </dd>
- <dt>‘<samp class="samp">lr>l-r</samp>’</dt>
- <dd><p>Left/Right to Left - Right.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">slev</samp></dt>
- <dd><p>Set level of side signal. Default is 1.
- Allowed range is from 0.015625 to 64.
- </p>
- </dd>
- <dt><samp class="option">sbal</samp></dt>
- <dd><p>Set balance of side signal. Default is 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">mlev</samp></dt>
- <dd><p>Set level of the middle signal. Default is 1.
- Allowed range is from 0.015625 to 64.
- </p>
- </dd>
- <dt><samp class="option">mpan</samp></dt>
- <dd><p>Set middle signal pan. Default is 0. Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">base</samp></dt>
- <dd><p>Set stereo base between mono and inversed channels. Default is 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Set delay in milliseconds how much to delay left from right channel and
- vice versa. Default is 0. Allowed range is from -20 to 20.
- </p>
- </dd>
- <dt><samp class="option">sclevel</samp></dt>
- <dd><p>Set S/C level. Default is 1. Allowed range is from 1 to 100.
- </p>
- </dd>
- <dt><samp class="option">phase</samp></dt>
- <dd><p>Set the stereo phase in degrees. Default is 0. Allowed range is from 0 to 360.
- </p>
- </dd>
- <dt><samp class="option">bmode_in, bmode_out</samp></dt>
- <dd><p>Set balance mode for balance_in/balance_out option.
- </p>
- <p>Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">balance</samp>’</dt>
- <dd><p>Classic balance mode. Attenuate one channel at time.
- Gain is raised up to 1.
- </p>
- </dd>
- <dt>‘<samp class="samp">amplitude</samp>’</dt>
- <dd><p>Similar as classic mode above but gain is raised up to 2.
- </p>
- </dd>
- <dt>‘<samp class="samp">power</samp>’</dt>
- <dd><p>Equal power distribution, from -6dB to +6dB range.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-49"></a>
- <h4 class="subsection">36.111.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-49" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-49" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-80"></a>
- <h4 class="subsection">36.111.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-80" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-80" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply karaoke like effect:
- <div class="example">
- <pre class="example-preformatted">stereotools=mlev=0.015625
- </pre></div>
- </li><li>Convert M/S signal to L/R:
- <div class="example">
- <pre class="example-preformatted">"stereotools=mode=ms>lr"
- </pre></div>
- </li></ul>
- <a name="stereowiden"></a>
- <h3 class="section">36.112 stereowiden<span class="pull-right"><a class="anchor hidden-xs" href="#stereowiden" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-stereowiden" aria-hidden="true">TOC</a></span></h3>
- <p>This filter enhance the stereo effect by suppressing signal common to both
- channels and by delaying the signal of left into right and vice versa,
- thereby widening the stereo effect.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">delay</samp></dt>
- <dd><p>Time in milliseconds of the delay of left signal into right and vice versa.
- Default is 20 milliseconds.
- </p>
- </dd>
- <dt><samp class="option">feedback</samp></dt>
- <dd><p>Amount of gain in delayed signal into right and vice versa. Gives a delay
- effect of left signal in right output and vice versa which gives widening
- effect. Default is 0.3.
- </p>
- </dd>
- <dt><samp class="option">crossfeed</samp></dt>
- <dd><p>Cross feed of left into right with inverted phase. This helps in suppressing
- the mono. If the value is 1 it will cancel all the signal common to both
- channels. Default is 0.3.
- </p>
- </dd>
- <dt><samp class="option">drymix</samp></dt>
- <dd><p>Set level of input signal of original channel. Default is 0.8.
- </p></dd>
- </dl>
- <a name="Commands-50"></a>
- <h4 class="subsection">36.112.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-50" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-50" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options except <code class="code">delay</code> as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="superequalizer"></a>
- <h3 class="section">36.113 superequalizer<span class="pull-right"><a class="anchor hidden-xs" href="#superequalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-superequalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Apply 18 band equalizer.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">1b</samp></dt>
- <dd><p>Set 65Hz band gain.
- </p></dd>
- <dt><samp class="option">2b</samp></dt>
- <dd><p>Set 92Hz band gain.
- </p></dd>
- <dt><samp class="option">3b</samp></dt>
- <dd><p>Set 131Hz band gain.
- </p></dd>
- <dt><samp class="option">4b</samp></dt>
- <dd><p>Set 185Hz band gain.
- </p></dd>
- <dt><samp class="option">5b</samp></dt>
- <dd><p>Set 262Hz band gain.
- </p></dd>
- <dt><samp class="option">6b</samp></dt>
- <dd><p>Set 370Hz band gain.
- </p></dd>
- <dt><samp class="option">7b</samp></dt>
- <dd><p>Set 523Hz band gain.
- </p></dd>
- <dt><samp class="option">8b</samp></dt>
- <dd><p>Set 740Hz band gain.
- </p></dd>
- <dt><samp class="option">9b</samp></dt>
- <dd><p>Set 1047Hz band gain.
- </p></dd>
- <dt><samp class="option">10b</samp></dt>
- <dd><p>Set 1480Hz band gain.
- </p></dd>
- <dt><samp class="option">11b</samp></dt>
- <dd><p>Set 2093Hz band gain.
- </p></dd>
- <dt><samp class="option">12b</samp></dt>
- <dd><p>Set 2960Hz band gain.
- </p></dd>
- <dt><samp class="option">13b</samp></dt>
- <dd><p>Set 4186Hz band gain.
- </p></dd>
- <dt><samp class="option">14b</samp></dt>
- <dd><p>Set 5920Hz band gain.
- </p></dd>
- <dt><samp class="option">15b</samp></dt>
- <dd><p>Set 8372Hz band gain.
- </p></dd>
- <dt><samp class="option">16b</samp></dt>
- <dd><p>Set 11840Hz band gain.
- </p></dd>
- <dt><samp class="option">17b</samp></dt>
- <dd><p>Set 16744Hz band gain.
- </p></dd>
- <dt><samp class="option">18b</samp></dt>
- <dd><p>Set 20000Hz band gain.
- </p></dd>
- </dl>
- <a name="surround"></a>
- <h3 class="section">36.114 surround<span class="pull-right"><a class="anchor hidden-xs" href="#surround" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-surround" aria-hidden="true">TOC</a></span></h3>
- <p>Apply audio surround upmix filter.
- </p>
- <p>This filter allows to produce multichannel output from audio stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">chl_out</samp></dt>
- <dd><p>Set output channel layout. By default, this is <var class="var">5.1</var>.
- </p>
- <p>See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#channel-layout-syntax">the Channel Layout section in the ffmpeg-utils(1) manual</a>
- for the required syntax.
- </p>
- </dd>
- <dt><samp class="option">chl_in</samp></dt>
- <dd><p>Set input channel layout. By default, this is <var class="var">stereo</var>.
- </p>
- <p>See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#channel-layout-syntax">the Channel Layout section in the ffmpeg-utils(1) manual</a>
- for the required syntax.
- </p>
- </dd>
- <dt><samp class="option">level_in</samp></dt>
- <dd><p>Set input volume level. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">level_out</samp></dt>
- <dd><p>Set output volume level. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">lfe</samp></dt>
- <dd><p>Enable LFE channel output if output channel layout has it. By default, this is enabled.
- </p>
- </dd>
- <dt><samp class="option">lfe_low</samp></dt>
- <dd><p>Set LFE low cut off frequency. By default, this is <var class="var">128</var> Hz.
- </p>
- </dd>
- <dt><samp class="option">lfe_high</samp></dt>
- <dd><p>Set LFE high cut off frequency. By default, this is <var class="var">256</var> Hz.
- </p>
- </dd>
- <dt><samp class="option">lfe_mode</samp></dt>
- <dd><p>Set LFE mode, can be <var class="var">add</var> or <var class="var">sub</var>. Default is <var class="var">add</var>.
- In <var class="var">add</var> mode, LFE channel is created from input audio and added to output.
- In <var class="var">sub</var> mode, LFE channel is created from input audio and added to output but
- also all non-LFE output channels are subtracted with output LFE channel.
- </p>
- </dd>
- <dt><samp class="option">smooth</samp></dt>
- <dd><p>Set temporal smoothness strength, used to gradually change factors when transforming
- stereo sound in time. Allowed range is from <var class="var">0.0</var> to <var class="var">1.0</var>.
- Useful to improve output quality with <var class="var">focus</var> option values greater than <var class="var">0.0</var>.
- Default is <var class="var">0.0</var>. Only values inside this range and without edges are effective.
- </p>
- </dd>
- <dt><samp class="option">angle</samp></dt>
- <dd><p>Set angle of stereo surround transform, Allowed range is from <var class="var">0</var> to <var class="var">360</var>.
- Default is <var class="var">90</var>.
- </p>
- </dd>
- <dt><samp class="option">focus</samp></dt>
- <dd><p>Set focus of stereo surround transform, Allowed range is from <var class="var">-1</var> to <var class="var">1</var>.
- Default is <var class="var">0</var>.
- </p>
- </dd>
- <dt><samp class="option">fc_in</samp></dt>
- <dd><p>Set front center input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">fc_out</samp></dt>
- <dd><p>Set front center output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">fl_in</samp></dt>
- <dd><p>Set front left input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">fl_out</samp></dt>
- <dd><p>Set front left output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">fr_in</samp></dt>
- <dd><p>Set front right input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">fr_out</samp></dt>
- <dd><p>Set front right output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">sl_in</samp></dt>
- <dd><p>Set side left input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">sl_out</samp></dt>
- <dd><p>Set side left output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">sr_in</samp></dt>
- <dd><p>Set side right input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">sr_out</samp></dt>
- <dd><p>Set side right output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">bl_in</samp></dt>
- <dd><p>Set back left input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">bl_out</samp></dt>
- <dd><p>Set back left output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">br_in</samp></dt>
- <dd><p>Set back right input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">br_out</samp></dt>
- <dd><p>Set back right output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">bc_in</samp></dt>
- <dd><p>Set back center input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">bc_out</samp></dt>
- <dd><p>Set back center output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">lfe_in</samp></dt>
- <dd><p>Set LFE input volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">lfe_out</samp></dt>
- <dd><p>Set LFE output volume. By default, this is <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">allx</samp></dt>
- <dd><p>Set spread usage of stereo image across X axis for all channels.
- Allowed range is from <var class="var">-1</var> to <var class="var">15</var>.
- By default this value is negative <var class="var">-1</var>, and thus unused.
- </p>
- </dd>
- <dt><samp class="option">ally</samp></dt>
- <dd><p>Set spread usage of stereo image across Y axis for all channels.
- Allowed range is from <var class="var">-1</var> to <var class="var">15</var>.
- By default this value is negative <var class="var">-1</var>, and thus unused.
- </p>
- </dd>
- <dt><samp class="option">fcx, flx, frx, blx, brx, slx, srx, bcx</samp></dt>
- <dd><p>Set spread usage of stereo image across X axis for each channel.
- Allowed range is from <var class="var">0.06</var> to <var class="var">15</var>.
- By default this value is <var class="var">0.5</var>.
- </p>
- </dd>
- <dt><samp class="option">fcy, fly, fry, bly, bry, sly, sry, bcy</samp></dt>
- <dd><p>Set spread usage of stereo image across Y axis for each channel.
- Allowed range is from <var class="var">0.06</var> to <var class="var">15</var>.
- By default this value is <var class="var">0.5</var>.
- </p>
- </dd>
- <dt><samp class="option">win_size</samp></dt>
- <dd><p>Set window size. Allowed range is from <var class="var">1024</var> to <var class="var">65536</var>. Default size is <var class="var">4096</var>.
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hann, hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default is <code class="code">hann</code>.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set window overlap. If set to 1, the recommended overlap for selected
- window function will be picked. Default is <code class="code">0.5</code>.
- </p></dd>
- </dl>
- <a name="tiltshelf"></a>
- <h3 class="section">36.115 tiltshelf<span class="pull-right"><a class="anchor hidden-xs" href="#tiltshelf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tiltshelf" aria-hidden="true">TOC</a></span></h3>
- <p>Boost or cut the lower frequencies and cut or boost higher frequencies
- of the audio using a two-pole shelving filter with a response similar to
- that of a standard hi-fi’s tone-controls.
- This is also known as shelving equalisation (EQ).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Give the gain at 0 Hz. Its useful range is about -20
- (for a large cut) to +20 (for a large boost).
- Beware of clipping when using a positive gain.
- </p>
- </dd>
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the filter’s central frequency and so can be used
- to extend or reduce the frequency range to be boosted or cut.
- The default value is <code class="code">3000</code> Hz.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Determine how steep is the filter’s shelf transition.
- </p>
- </dd>
- <dt><samp class="option">poles, p</samp></dt>
- <dd><p>Set number of poles. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-51"></a>
- <h4 class="subsection">36.115.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-51" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-51" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports some options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="treble_002c-highshelf"></a>
- <h3 class="section">36.116 treble, highshelf<span class="pull-right"><a class="anchor hidden-xs" href="#treble_002c-highshelf" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-treble_002c-highshelf" aria-hidden="true">TOC</a></span></h3>
- <p>Boost or cut treble (upper) frequencies of the audio using a two-pole
- shelving filter with a response similar to that of a standard
- hi-fi’s tone-controls. This is also known as shelving equalisation (EQ).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Give the gain at whichever is the lower of ~22 kHz and the
- Nyquist frequency. Its useful range is about -20 (for a large cut)
- to +20 (for a large boost). Beware of clipping when using a positive gain.
- </p>
- </dd>
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the filter’s central frequency and so can be used
- to extend or reduce the frequency range to be boosted or cut.
- The default value is <code class="code">3000</code> Hz.
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Set method to specify band-width of filter.
- </p><dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Hz
- </p></dd>
- <dt><samp class="option">q</samp></dt>
- <dd><p>Q-Factor
- </p></dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>octave
- </p></dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>slope
- </p></dd>
- <dt><samp class="option">k</samp></dt>
- <dd><p>kHz
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Determine how steep is the filter’s shelf transition.
- </p>
- </dd>
- <dt><samp class="option">poles, p</samp></dt>
- <dd><p>Set number of poles. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>How much to use filtered signal in output. Default is 1.
- Range is between 0 and 1.
- </p>
- </dd>
- <dt><samp class="option">channels, c</samp></dt>
- <dd><p>Specify which channels to filter, by default all available are filtered.
- </p>
- </dd>
- <dt><samp class="option">normalize, n</samp></dt>
- <dd><p>Normalize biquad coefficients, by default is disabled.
- Enabling it will normalize magnitude response at DC to 0dB.
- </p>
- </dd>
- <dt><samp class="option">transform, a</samp></dt>
- <dd><p>Set transform type of IIR filter.
- </p><dl class="table">
- <dt><samp class="option">di</samp></dt>
- <dt><samp class="option">dii</samp></dt>
- <dt><samp class="option">tdi</samp></dt>
- <dt><samp class="option">tdii</samp></dt>
- <dt><samp class="option">latt</samp></dt>
- <dt><samp class="option">svf</samp></dt>
- <dt><samp class="option">zdf</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">precision, r</samp></dt>
- <dd><p>Set precision of filtering.
- </p><dl class="table">
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Pick automatic sample format depending on surround filters.
- </p></dd>
- <dt><samp class="option">s16</samp></dt>
- <dd><p>Always use signed 16-bit.
- </p></dd>
- <dt><samp class="option">s32</samp></dt>
- <dd><p>Always use signed 32-bit.
- </p></dd>
- <dt><samp class="option">f32</samp></dt>
- <dd><p>Always use float 32-bit.
- </p></dd>
- <dt><samp class="option">f64</samp></dt>
- <dd><p>Always use float 64-bit.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">block_size, b</samp></dt>
- <dd><p>Set block size used for reverse IIR processing. If this value is set to high enough
- value (higher than impulse response length truncated when reaches near zero values) filtering
- will become linear phase otherwise if not big enough it will just produce nasty artifacts.
- </p>
- <p>Note that filter delay will be exactly this many samples when set to non-zero value.
- </p></dd>
- </dl>
- <a name="Commands-52"></a>
- <h4 class="subsection">36.116.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-52" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-52" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Change treble frequency.
- Syntax for the command is : "<var class="var">frequency</var>"
- </p>
- </dd>
- <dt><samp class="option">width_type, t</samp></dt>
- <dd><p>Change treble width_type.
- Syntax for the command is : "<var class="var">width_type</var>"
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Change treble width.
- Syntax for the command is : "<var class="var">width</var>"
- </p>
- </dd>
- <dt><samp class="option">gain, g</samp></dt>
- <dd><p>Change treble gain.
- Syntax for the command is : "<var class="var">gain</var>"
- </p>
- </dd>
- <dt><samp class="option">mix, m</samp></dt>
- <dd><p>Change treble mix.
- Syntax for the command is : "<var class="var">mix</var>"
- </p></dd>
- </dl>
- <a name="tremolo"></a>
- <h3 class="section">36.117 tremolo<span class="pull-right"><a class="anchor hidden-xs" href="#tremolo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tremolo" aria-hidden="true">TOC</a></span></h3>
- <p>Sinusoidal amplitude modulation.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">f</samp></dt>
- <dd><p>Modulation frequency in Hertz. Modulation frequencies in the subharmonic range
- (20 Hz or lower) will result in a tremolo effect.
- This filter may also be used as a ring modulator by specifying
- a modulation frequency higher than 20 Hz.
- Range is 0.1 - 20000.0. Default value is 5.0 Hz.
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>Depth of modulation as a percentage. Range is 0.0 - 1.0.
- Default value is 0.5.
- </p></dd>
- </dl>
- <a name="vibrato"></a>
- <h3 class="section">36.118 vibrato<span class="pull-right"><a class="anchor hidden-xs" href="#vibrato" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vibrato" aria-hidden="true">TOC</a></span></h3>
- <p>Sinusoidal phase modulation.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">f</samp></dt>
- <dd><p>Modulation frequency in Hertz.
- Range is 0.1 - 20000.0. Default value is 5.0 Hz.
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>Depth of modulation as a percentage. Range is 0.0 - 1.0.
- Default value is 0.5.
- </p></dd>
- </dl>
- <a name="virtualbass"></a>
- <h3 class="section">36.119 virtualbass<span class="pull-right"><a class="anchor hidden-xs" href="#virtualbass" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-virtualbass" aria-hidden="true">TOC</a></span></h3>
- <p>Apply audio Virtual Bass filter.
- </p>
- <p>This filter accepts stereo input and produce stereo with LFE (2.1) channels output.
- The newly produced LFE channel have enhanced virtual bass originally obtained from both stereo channels.
- This filter outputs front left and front right channels unchanged as available in stereo input.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">cutoff</samp></dt>
- <dd><p>Set the virtual bass cutoff frequency. Default value is 250 Hz.
- Allowed range is from 100 to 500 Hz.
- </p>
- </dd>
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Set the virtual bass strength. Allowed range is from 0.5 to 3.
- Default value is 3.
- </p></dd>
- </dl>
- <a name="volume"></a>
- <h3 class="section">36.120 volume<span class="pull-right"><a class="anchor hidden-xs" href="#volume" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-volume" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust the input audio volume.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">volume</samp></dt>
- <dd><p>Set audio volume expression.
- </p>
- <p>Output values are clipped to the maximum value.
- </p>
- <p>The output audio volume is given by the relation:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">output_volume</var> = <var class="var">volume</var> * <var class="var">input_volume</var>
- </pre></div>
- <p>The default value for <var class="var">volume</var> is "1.0".
- </p>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>This parameter represents the mathematical precision.
- </p>
- <p>It determines which input sample formats will be allowed, which affects the
- precision of the volume scaling.
- </p>
- <dl class="table">
- <dt><samp class="option">fixed</samp></dt>
- <dd><p>8-bit fixed-point; this limits input sample format to U8, S16, and S32.
- </p></dd>
- <dt><samp class="option">float</samp></dt>
- <dd><p>32-bit floating-point; this limits input sample format to FLT. (default)
- </p></dd>
- <dt><samp class="option">double</samp></dt>
- <dd><p>64-bit floating-point; this limits input sample format to DBL.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">replaygain</samp></dt>
- <dd><p>Choose the behaviour on encountering ReplayGain side data in input frames.
- </p>
- <dl class="table">
- <dt><samp class="option">drop</samp></dt>
- <dd><p>Remove ReplayGain side data, ignoring its contents (the default).
- </p>
- </dd>
- <dt><samp class="option">ignore</samp></dt>
- <dd><p>Ignore ReplayGain side data, but leave it in the frame.
- </p>
- </dd>
- <dt><samp class="option">track</samp></dt>
- <dd><p>Prefer the track gain, if present.
- </p>
- </dd>
- <dt><samp class="option">album</samp></dt>
- <dd><p>Prefer the album gain, if present.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">replaygain_preamp</samp></dt>
- <dd><p>Pre-amplification gain in dB to apply to the selected replaygain gain.
- </p>
- <p>Default value for <var class="var">replaygain_preamp</var> is 0.0.
- </p>
- </dd>
- <dt><samp class="option">replaygain_noclip</samp></dt>
- <dd><p>Prevent clipping by limiting the gain applied.
- </p>
- <p>Default value for <var class="var">replaygain_noclip</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set when the volume expression is evaluated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">once</samp>’</dt>
- <dd><p>only evaluate expression once during the filter initialization, or
- when the ‘<samp class="samp">volume</samp>’ command is sent
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>evaluate expression for each incoming frame
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">once</samp>’.
- </p></dd>
- </dl>
- <p>The volume expression can contain the following parameters.
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>frame number (starting at zero)
- </p></dd>
- <dt><samp class="option">nb_channels</samp></dt>
- <dd><p>number of channels
- </p></dd>
- <dt><samp class="option">nb_consumed_samples</samp></dt>
- <dd><p>number of samples consumed by the filter
- </p></dd>
- <dt><samp class="option">nb_samples</samp></dt>
- <dd><p>number of samples in the current frame
- </p></dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>original frame position in the file; deprecated, do not use
- </p></dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>frame PTS
- </p></dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>sample rate
- </p></dd>
- <dt><samp class="option">startpts</samp></dt>
- <dd><p>PTS at start of stream
- </p></dd>
- <dt><samp class="option">startt</samp></dt>
- <dd><p>time at start of stream
- </p></dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>frame time
- </p></dd>
- <dt><samp class="option">tb</samp></dt>
- <dd><p>timestamp timebase
- </p></dd>
- <dt><samp class="option">volume</samp></dt>
- <dd><p>last set volume value
- </p></dd>
- </dl>
- <p>Note that when <samp class="option">eval</samp> is set to ‘<samp class="samp">once</samp>’ only the
- <var class="var">sample_rate</var> and <var class="var">tb</var> variables are available, all other
- variables will evaluate to NAN.
- </p>
- <a name="Commands-53"></a>
- <h4 class="subsection">36.120.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-53" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-53" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">volume</samp></dt>
- <dd><p>Modify the volume expression.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="Examples-81"></a>
- <h4 class="subsection">36.120.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-81" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-81" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Halve the input audio volume:
- <div class="example">
- <pre class="example-preformatted">volume=volume=0.5
- volume=volume=1/2
- volume=volume=-6.0206dB
- </pre></div>
- <p>In all the above example the named key for <samp class="option">volume</samp> can be
- omitted, for example like in:
- </p><div class="example">
- <pre class="example-preformatted">volume=0.5
- </pre></div>
- </li><li>Increase input audio power by 6 decibels using fixed-point precision:
- <div class="example">
- <pre class="example-preformatted">volume=volume=6dB:precision=fixed
- </pre></div>
- </li><li>Fade volume after time 10 with an annihilation period of 5 seconds:
- <div class="example">
- <pre class="example-preformatted">volume='if(lt(t,10),1,max(1-(t-10)/5,0))':eval=frame
- </pre></div>
- </li></ul>
- <a name="volumedetect"></a>
- <h3 class="section">36.121 volumedetect<span class="pull-right"><a class="anchor hidden-xs" href="#volumedetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-volumedetect" aria-hidden="true">TOC</a></span></h3>
- <p>Detect the volume of the input video.
- </p>
- <p>The filter has no parameters. It supports only 16-bit signed integer samples,
- so the input will be converted when needed. Statistics about the volume will
- be printed in the log when the input stream end is reached.
- </p>
- <p>In particular it will show the mean volume (root mean square), maximum
- volume (on a per-sample basis), and the beginning of a histogram of the
- registered volume values (from the maximum value to a cumulated 1/1000 of
- the samples).
- </p>
- <p>All volumes are in decibels relative to the maximum PCM value.
- </p>
- <a name="Examples-82"></a>
- <h4 class="subsection">36.121.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-82" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-82" aria-hidden="true">TOC</a></span></h4>
- <p>Here is an excerpt of the output:
- </p><div class="example">
- <pre class="example-preformatted">[Parsed_volumedetect_0 0xa23120] mean_volume: -27 dB
- [Parsed_volumedetect_0 0xa23120] max_volume: -4 dB
- [Parsed_volumedetect_0 0xa23120] histogram_4db: 6
- [Parsed_volumedetect_0 0xa23120] histogram_5db: 62
- [Parsed_volumedetect_0 0xa23120] histogram_6db: 286
- [Parsed_volumedetect_0 0xa23120] histogram_7db: 1042
- [Parsed_volumedetect_0 0xa23120] histogram_8db: 2551
- [Parsed_volumedetect_0 0xa23120] histogram_9db: 4609
- [Parsed_volumedetect_0 0xa23120] histogram_10db: 8409
- </pre></div>
- <p>It means that:
- </p><ul class="itemize mark-bullet">
- <li>The mean square energy is approximately -27 dB, or 10^-2.7.
- </li><li>The largest sample is at -4 dB, or more precisely between -4 dB and -5 dB.
- </li><li>There are 6 samples at -4 dB, 62 at -5 dB, 286 at -6 dB, etc.
- </li></ul>
- <p>In other words, raising the volume by +4 dB does not cause any clipping,
- raising it by +5 dB causes clipping for 6 samples, etc.
- </p>
- <a class="anchor" id="whisper"></a><a name="whisper-1"></a>
- <h3 class="section">36.122 whisper<span class="pull-right"><a class="anchor hidden-xs" href="#whisper-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-whisper-1" aria-hidden="true">TOC</a></span></h3>
- <p>It runs automatic speech recognition using the OpenAI’s Whisper model.
- </p>
- <p>It requires the whisper.cpp library (https://github.com/ggml-org/whisper.cpp)
- as a prerequisite. After installing the library it can be enabled using:
- <code class="code">./configure --enable-whisper</code>.
- </p>
- <p>The filter has following options:
- </p>
- <dl class="table">
- <dt><samp class="option">model</samp></dt>
- <dd><p>The file path of the downloaded whisper.cpp model (mandatory).
- </p>
- </dd>
- <dt><samp class="option">language</samp></dt>
- <dd><p>The language to use for transcription (’auto’ for auto-detect).
- Default value: <code class="code">"auto"</code>
- </p>
- </dd>
- <dt><samp class="option">queue</samp></dt>
- <dd><p>The maximum size that will be queued into the filter before processing the audio
- with whisper. Using a small value the audio stream will be processed more often,
- but the transcription quality will be lower and the required processing power
- will be higher. Using a large value (e.g. 10-20s) will produce more accurate
- results using less CPU (as using the whisper-cli tool), but the transcription
- latency will be higher, thus not useful to process real-time streams.
- Consider using the vad_model option associated with a large queue value.
- Default value: <code class="code">"3"</code>
- </p>
- </dd>
- <dt><samp class="option">use_gpu</samp></dt>
- <dd><p>If the GPU support should be enabled.
- Default value: <code class="code">"true"</code>
- </p>
- </dd>
- <dt><samp class="option">gpu_device</samp></dt>
- <dd><p>The GPU device index to use.
- Default value: <code class="code">"0"</code>
- </p>
- </dd>
- <dt><samp class="option">destination</samp></dt>
- <dd><p>If set, the transcription output will be sent to the specified file or URL
- (use one of the FFmpeg AVIO protocols); otherwise, the output will be logged as
- info messages.
- The output will also be set in the "lavfi.whisper.text" frame metadata.
- If the destination is a file and it already exists, it will be overwritten.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>The destination format string; it could be "text" (only the transcribed text
- will be sent to the destination), "srt" (subtitle format) or "json".
- Default value: <code class="code">"text"</code>
- </p>
- </dd>
- <dt><samp class="option">vad_model</samp></dt>
- <dd><p>Path to the VAD model file. If set, the filter will load an additional voice
- activity detection module (https://github.com/snakers4/silero-vad) that will be
- used to fragment the audio queue; use this option setting a valid path obtained
- from the whisper.cpp repository (e.g. "../whisper.cpp/models/ggml-silero-v5.1.2.bin")
- and increase the queue parameter to a higher value (e.g. 20).
- </p>
- </dd>
- <dt><samp class="option">vad_threshold</samp></dt>
- <dd><p>The VAD threshold to use.
- Default value: <code class="code">"0.5"</code>
- </p>
- </dd>
- <dt><samp class="option">vad_min_speech_duration</samp></dt>
- <dd><p>The minimum VAD speaking duration.
- Default value: <code class="code">"0.1"</code>
- </p>
- </dd>
- <dt><samp class="option">vad_min_silence_duration</samp></dt>
- <dd><p>The minimum VAD silence duration.
- Default value: <code class="code">"0.5"</code>
- </p>
- </dd>
- </dl>
- <a name="Examples-83"></a>
- <h4 class="subsection">36.122.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-83" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-83" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Run a transcription with srt file generation:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp4 -vn -af "whisper=model=../whisper.cpp/models/ggml-base.en.bin\
- :language=en\
- :queue=3\
- :destination=output.srt\
- :format=srt" -f null -
- </pre></div>
- </li><li>Run a transcription and send the output in JSON format to an HTTP service:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp4 -vn -af "whisper=model=../whisper.cpp/models/ggml-base.en.bin\
- :language=en\
- :queue=3\
- :destination=http\\://localhost\\:3000\
- :format=json' -f null -
- </pre></div>
- </li><li>Transcribe the microphone input using the VAD option:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -loglevel warning -f pulse -i default \
- -af 'highpass=f=200,lowpass=f=3000,whisper=model=../whisper.cpp/models/ggml-medium.bin\
- :language=en\
- :queue=10\
- :destination=-\
- :format=json\
- :vad_model=../whisper.cpp/models/ggml-silero-v5.1.2.bin' -f null -
- </pre></div>
- </li></ul>
- <a name="Audio-Sources"></a>
- <h2 class="chapter">37 Audio Sources<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Sources" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Sources" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available audio sources.
- </p>
- <a name="abuffer"></a>
- <h3 class="section">37.1 abuffer<span class="pull-right"><a class="anchor hidden-xs" href="#abuffer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-abuffer" aria-hidden="true">TOC</a></span></h3>
- <p>Buffer audio frames, and make them available to the filter chain.
- </p>
- <p>This source is mainly intended for a programmatic use, in particular
- through the interface defined in <samp class="file">libavfilter/buffersrc.h</samp>.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">time_base</samp></dt>
- <dd><p>The timebase which will be used for timestamps of submitted frames. It must be
- either a floating-point number or in <var class="var">numerator</var>/<var class="var">denominator</var> form.
- </p>
- </dd>
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>The sample rate of the incoming audio buffers.
- </p>
- </dd>
- <dt><samp class="option">sample_fmt</samp></dt>
- <dd><p>The sample format of the incoming audio buffers.
- Either a sample format name or its corresponding integer representation from
- the enum AVSampleFormat in <samp class="file">libavutil/samplefmt.h</samp>
- </p>
- </dd>
- <dt><samp class="option">channel_layout</samp></dt>
- <dd><p>The channel layout of the incoming audio buffers.
- Either a channel layout name from channel_layout_map in
- <samp class="file">libavutil/channel_layout.c</samp> or its corresponding integer representation
- from the AV_CH_LAYOUT_* macros in <samp class="file">libavutil/channel_layout.h</samp>
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>The number of channels of the incoming audio buffers.
- If both <var class="var">channels</var> and <var class="var">channel_layout</var> are specified, then they
- must be consistent.
- </p>
- </dd>
- </dl>
- <a name="Examples-84"></a>
- <h4 class="subsection">37.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-84" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-84" aria-hidden="true">TOC</a></span></h4>
- <div class="example">
- <pre class="example-preformatted">abuffer=sample_rate=44100:sample_fmt=s16p:channel_layout=stereo
- </pre></div>
- <p>will instruct the source to accept planar 16bit signed stereo at 44100Hz.
- Since the sample format with name "s16p" corresponds to the number
- 6 and the "stereo" channel layout corresponds to the value 0x3, this is
- equivalent to:
- </p><div class="example">
- <pre class="example-preformatted">abuffer=sample_rate=44100:sample_fmt=6:channel_layout=0x3
- </pre></div>
- <a name="aevalsrc"></a>
- <h3 class="section">37.2 aevalsrc<span class="pull-right"><a class="anchor hidden-xs" href="#aevalsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aevalsrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate an audio signal specified by an expression.
- </p>
- <p>This source accepts in input one or more expressions (one for each
- channel), which are evaluated and used to generate a corresponding
- audio signal.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">exprs</samp></dt>
- <dd><p>Set the ’|’-separated expressions list for each separate channel. In case the
- <samp class="option">channel_layout</samp> option is not specified, the selected channel layout
- depends on the number of provided expressions. Otherwise the last
- specified expression is applied to the remaining output channels.
- </p>
- </dd>
- <dt><samp class="option">channel_layout, c</samp></dt>
- <dd><p>Set the channel layout. The number of channels in the specified layout
- must be equal to the number of specified expressions.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the minimum duration of the sourced audio. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- Note that the resulting duration may be greater than the specified
- duration, as the generated audio is always cut at the end of a
- complete frame.
- </p>
- <p>If not specified, or the expressed duration is negative, the audio is
- supposed to be generated forever.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the number of samples per channel per each output frame,
- default to 1024.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, s</samp></dt>
- <dd><p>Specify the sample rate, default to 44100.
- </p></dd>
- </dl>
- <p>Each expression in <var class="var">exprs</var> can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>number of the evaluated sample, starting from 0
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>time of the evaluated sample expressed in seconds, starting from 0
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>sample rate
- </p>
- </dd>
- </dl>
- <a name="Examples-85"></a>
- <h4 class="subsection">37.2.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-85" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-85" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate silence:
- <div class="example">
- <pre class="example-preformatted">aevalsrc=0
- </pre></div>
- </li><li>Generate a sin signal with frequency of 440 Hz, set sample rate to
- 8000 Hz:
- <div class="example">
- <pre class="example-preformatted">aevalsrc="sin(440*2*PI*t):s=8000"
- </pre></div>
- </li><li>Generate a two channels signal, specify the channel layout (Front
- Center + Back Center) explicitly:
- <div class="example">
- <pre class="example-preformatted">aevalsrc="sin(420*2*PI*t)|cos(430*2*PI*t):c=FC|BC"
- </pre></div>
- </li><li>Generate white noise:
- <div class="example">
- <pre class="example-preformatted">aevalsrc="-2+random(0)"
- </pre></div>
- </li><li>Generate an amplitude modulated signal:
- <div class="example">
- <pre class="example-preformatted">aevalsrc="sin(10*2*PI*t)*sin(880*2*PI*t)"
- </pre></div>
- </li><li>Generate 2.5 Hz binaural beats on a 360 Hz carrier:
- <div class="example">
- <pre class="example-preformatted">aevalsrc="0.1*sin(2*PI*(360-2.5/2)*t) | 0.1*sin(2*PI*(360+2.5/2)*t)"
- </pre></div>
- </li></ul>
- <a name="afdelaysrc"></a>
- <h3 class="section">37.3 afdelaysrc<span class="pull-right"><a class="anchor hidden-xs" href="#afdelaysrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afdelaysrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a fractional delay FIR coefficients.
- </p>
- <p>The resulting stream can be used with <a class="ref" href="#afir">afir</a> filter for filtering the audio signal.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">delay, d</samp></dt>
- <dd><p>Set the fractional delay. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Set the sample rate, default is 44100.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the number of samples per each frame. Default is 1024.
- </p>
- </dd>
- <dt><samp class="option">taps, t</samp></dt>
- <dd><p>Set the number of filter coefficients in output audio stream.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">channel_layout, c</samp></dt>
- <dd><p>Specifies the channel layout, and can be a string representing a channel layout.
- The default value of <var class="var">channel_layout</var> is "stereo".
- </p></dd>
- </dl>
- <a name="afireqsrc"></a>
- <h3 class="section">37.4 afireqsrc<span class="pull-right"><a class="anchor hidden-xs" href="#afireqsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afireqsrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a FIR equalizer coefficients.
- </p>
- <p>The resulting stream can be used with <a class="ref" href="#afir">afir</a> filter for filtering the audio signal.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">preset, p</samp></dt>
- <dd><p>Set equalizer preset.
- Default preset is <code class="code">flat</code>.
- </p>
- <p>Available presets are:
- </p><dl class="table">
- <dt>‘<samp class="samp">custom</samp>’</dt>
- <dt>‘<samp class="samp">flat</samp>’</dt>
- <dt>‘<samp class="samp">acoustic</samp>’</dt>
- <dt>‘<samp class="samp">bass</samp>’</dt>
- <dt>‘<samp class="samp">beats</samp>’</dt>
- <dt>‘<samp class="samp">classic</samp>’</dt>
- <dt>‘<samp class="samp">clear</samp>’</dt>
- <dt>‘<samp class="samp">deep bass</samp>’</dt>
- <dt>‘<samp class="samp">dubstep</samp>’</dt>
- <dt>‘<samp class="samp">electronic</samp>’</dt>
- <dt>‘<samp class="samp">hard-style</samp>’</dt>
- <dt>‘<samp class="samp">hip-hop</samp>’</dt>
- <dt>‘<samp class="samp">jazz</samp>’</dt>
- <dt>‘<samp class="samp">metal</samp>’</dt>
- <dt>‘<samp class="samp">movie</samp>’</dt>
- <dt>‘<samp class="samp">pop</samp>’</dt>
- <dt>‘<samp class="samp">r&b</samp>’</dt>
- <dt>‘<samp class="samp">rock</samp>’</dt>
- <dt>‘<samp class="samp">vocal booster</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">gains, g</samp></dt>
- <dd><p>Set custom gains for each band. Only used if the preset option is set to <code class="code">custom</code>.
- Gains are separated by white spaces and each gain is set in dBFS.
- Default is <code class="code">0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0</code>.
- </p>
- </dd>
- <dt><samp class="option">bands, b</samp></dt>
- <dd><p>Set the custom bands from where custom equalizer gains are set.
- This must be in strictly increasing order. Only used if the preset option is set to <code class="code">custom</code>.
- Bands are separated by white spaces and each band represent frequency in Hz.
- Default is <code class="code">25 40 63 100 160 250 400 630 1000 1600 2500 4000 6300 10000 16000 24000</code>.
- </p>
- </dd>
- <dt><samp class="option">taps, t</samp></dt>
- <dd><p>Set number of filter coefficients in output audio stream.
- Default value is <code class="code">4096</code>.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Set sample rate of output audio stream, default is <code class="code">44100</code>.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set number of samples per each frame in output audio stream. Default is <code class="code">1024</code>.
- </p>
- </dd>
- <dt><samp class="option">interp, i</samp></dt>
- <dd><p>Set interpolation method for FIR equalizer coefficients. Can be <code class="code">linear</code> or <code class="code">cubic</code>.
- </p>
- </dd>
- <dt><samp class="option">phase, h</samp></dt>
- <dd><p>Set phase type of FIR filter. Can be <code class="code">linear</code> or <code class="code">min</code>: minimum-phase.
- Default is minimum-phase filter.
- </p></dd>
- </dl>
- <a name="afirsrc"></a>
- <h3 class="section">37.5 afirsrc<span class="pull-right"><a class="anchor hidden-xs" href="#afirsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-afirsrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a FIR coefficients using frequency sampling method.
- </p>
- <p>The resulting stream can be used with <a class="ref" href="#afir">afir</a> filter for filtering the audio signal.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">taps, t</samp></dt>
- <dd><p>Set number of filter coefficients in output audio stream.
- Default value is 1025.
- </p>
- </dd>
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set frequency points from where magnitude and phase are set.
- This must be in non decreasing order, and first element must be 0, while last element
- must be 1. Elements are separated by white spaces.
- </p>
- </dd>
- <dt><samp class="option">magnitude, m</samp></dt>
- <dd><p>Set magnitude value for every frequency point set by <samp class="option">frequency</samp>.
- Number of values must be same as number of frequency points.
- Values are separated by white spaces.
- </p>
- </dd>
- <dt><samp class="option">phase, p</samp></dt>
- <dd><p>Set phase value for every frequency point set by <samp class="option">frequency</samp>.
- Number of values must be same as number of frequency points.
- Values are separated by white spaces.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Set sample rate, default is 44100.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set number of samples per each frame. Default is 1024.
- </p>
- </dd>
- <dt><samp class="option">win_func, w</samp></dt>
- <dd><p>Set window function. Default is blackman.
- </p></dd>
- </dl>
- <a name="anullsrc"></a>
- <h3 class="section">37.6 anullsrc<span class="pull-right"><a class="anchor hidden-xs" href="#anullsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anullsrc" aria-hidden="true">TOC</a></span></h3>
- <p>The null audio source, return unprocessed audio frames. It is mainly useful
- as a template and to be employed in analysis / debugging tools, or as
- the source for filters which ignore the input data (for example the sox
- synth filter).
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">channel_layout, cl</samp></dt>
- <dd>
- <p>Specifies the channel layout, and can be either an integer or a string
- representing a channel layout. The default value of <var class="var">channel_layout</var>
- is "stereo".
- </p>
- <p>Check the channel_layout_map definition in
- <samp class="file">libavutil/channel_layout.c</samp> for the mapping between strings and
- channel layout values.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Specifies the sample rate, and defaults to 44100.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the number of samples per requested frames.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the duration of the sourced audio. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>If not specified, or the expressed duration is negative, the audio is
- supposed to be generated forever.
- </p></dd>
- </dl>
- <a name="Examples-86"></a>
- <h4 class="subsection">37.6.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-86" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-86" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Set the sample rate to 48000 Hz and the channel layout to AV_CH_LAYOUT_MONO.
- <div class="example">
- <pre class="example-preformatted">anullsrc=r=48000:cl=4
- </pre></div>
- </li><li>Do the same operation with a more obvious syntax:
- <div class="example">
- <pre class="example-preformatted">anullsrc=r=48000:cl=mono
- </pre></div>
- </li></ul>
- <p>All the parameters need to be explicitly defined.
- </p>
- <a name="flite"></a>
- <h3 class="section">37.7 flite<span class="pull-right"><a class="anchor hidden-xs" href="#flite" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flite" aria-hidden="true">TOC</a></span></h3>
- <p>Synthesize a voice utterance using the libflite library.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-libflite</code>.
- </p>
- <p>Note that versions of the flite library prior to 2.0 are not thread-safe.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">list_voices</samp></dt>
- <dd><p>If set to 1, list the names of the available voices and exit
- immediately. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the maximum number of samples per frame. Default value is 512.
- </p>
- </dd>
- <dt><samp class="option">textfile</samp></dt>
- <dd><p>Set the filename containing the text to speak.
- </p>
- </dd>
- <dt><samp class="option">text</samp></dt>
- <dd><p>Set the text to speak.
- </p>
- </dd>
- <dt><samp class="option">voice, v</samp></dt>
- <dd><p>Set the voice to use for the speech synthesis. Default value is
- <code class="code">kal</code>. See also the <var class="var">list_voices</var> option.
- </p></dd>
- </dl>
- <a name="Examples-87"></a>
- <h4 class="subsection">37.7.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-87" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-87" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Read from file <samp class="file">speech.txt</samp>, and synthesize the text using the
- standard flite voice:
- <div class="example">
- <pre class="example-preformatted">flite=textfile=speech.txt
- </pre></div>
- </li><li>Read the specified text selecting the <code class="code">slt</code> voice:
- <div class="example">
- <pre class="example-preformatted">flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
- </pre></div>
- </li><li>Input text to ffmpeg:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
- </pre></div>
- </li><li>Make <samp class="file">ffplay</samp> speak the specified text, using <code class="code">flite</code> and
- the <code class="code">lavfi</code> device:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi flite=text='No more be grieved for which that thou hast done.'
- </pre></div>
- </li></ul>
- <p>For more information about libflite, check:
- <a class="url" href="http://www.festvox.org/flite/">http://www.festvox.org/flite/</a>
- </p>
- <a name="anoisesrc"></a>
- <h3 class="section">37.8 anoisesrc<span class="pull-right"><a class="anchor hidden-xs" href="#anoisesrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anoisesrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a noise audio signal.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Specify the sample rate. Default value is 48000 Hz.
- </p>
- </dd>
- <dt><samp class="option">amplitude, a</samp></dt>
- <dd><p>Specify the amplitude (0.0 - 1.0) of the generated audio stream. Default value
- is 1.0.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Specify the duration of the generated audio stream. Not specifying this option
- results in noise with an infinite length.
- </p>
- </dd>
- <dt><samp class="option">color, colour, c</samp></dt>
- <dd><p>Specify the color of noise. Available noise colors are white, pink, brown,
- blue, violet and velvet. Default color is white.
- </p>
- </dd>
- <dt><samp class="option">seed, s</samp></dt>
- <dd><p>Specify a value used to seed the PRNG.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set the number of samples per each output frame, default is 1024.
- </p>
- </dd>
- <dt><samp class="option">density</samp></dt>
- <dd><p>Set the density (0.0 - 1.0) for the velvet noise generator, default is 0.05.
- </p></dd>
- </dl>
- <a name="Examples-88"></a>
- <h4 class="subsection">37.8.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-88" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-88" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate 60 seconds of pink noise, with a 44.1 kHz sampling rate and an amplitude of 0.5:
- <div class="example">
- <pre class="example-preformatted">anoisesrc=d=60:c=pink:r=44100:a=0.5
- </pre></div>
- </li></ul>
- <a name="hilbert"></a>
- <h3 class="section">37.9 hilbert<span class="pull-right"><a class="anchor hidden-xs" href="#hilbert" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hilbert" aria-hidden="true">TOC</a></span></h3>
- <p>Generate odd-tap Hilbert transform FIR coefficients.
- </p>
- <p>The resulting stream can be used with <a class="ref" href="#afir">afir</a> filter for phase-shifting
- the signal by 90 degrees.
- </p>
- <p>This is used in many matrix coding schemes and for analytic signal generation.
- The process is often written as a multiplication by i (or j), the imaginary unit.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sample_rate, s</samp></dt>
- <dd><p>Set sample rate, default is 44100.
- </p>
- </dd>
- <dt><samp class="option">taps, t</samp></dt>
- <dd><p>Set length of FIR filter, default is 22051.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set number of samples per each frame.
- </p>
- </dd>
- <dt><samp class="option">win_func, w</samp></dt>
- <dd><p>Set window function to be used when generating FIR coefficients.
- </p></dd>
- </dl>
- <a name="sinc"></a>
- <h3 class="section">37.10 sinc<span class="pull-right"><a class="anchor hidden-xs" href="#sinc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sinc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a sinc kaiser-windowed low-pass, high-pass, band-pass, or band-reject FIR coefficients.
- </p>
- <p>The resulting stream can be used with <a class="ref" href="#afir">afir</a> filter for filtering the audio signal.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Set sample rate, default is 44100.
- </p>
- </dd>
- <dt><samp class="option">nb_samples, n</samp></dt>
- <dd><p>Set number of samples per each frame. Default is 1024.
- </p>
- </dd>
- <dt><samp class="option">hp</samp></dt>
- <dd><p>Set high-pass frequency. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">lp</samp></dt>
- <dd><p>Set low-pass frequency. Default is 0.
- If high-pass frequency is lower than low-pass frequency and low-pass frequency
- is higher than 0 then filter will create band-pass filter coefficients,
- otherwise band-reject filter coefficients.
- </p>
- </dd>
- <dt><samp class="option">phase</samp></dt>
- <dd><p>Set filter phase response. Default is 50. Allowed range is from 0 to 100.
- </p>
- </dd>
- <dt><samp class="option">beta</samp></dt>
- <dd><p>Set Kaiser window beta.
- </p>
- </dd>
- <dt><samp class="option">att</samp></dt>
- <dd><p>Set stop-band attenuation. Default is 120dB, allowed range is from 40 to 180 dB.
- </p>
- </dd>
- <dt><samp class="option">round</samp></dt>
- <dd><p>Enable rounding, by default is disabled.
- </p>
- </dd>
- <dt><samp class="option">hptaps</samp></dt>
- <dd><p>Set number of taps for high-pass filter.
- </p>
- </dd>
- <dt><samp class="option">lptaps</samp></dt>
- <dd><p>Set number of taps for low-pass filter.
- </p></dd>
- </dl>
- <a name="sine"></a>
- <h3 class="section">37.11 sine<span class="pull-right"><a class="anchor hidden-xs" href="#sine" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sine" aria-hidden="true">TOC</a></span></h3>
- <p>Generate an audio signal made of a sine wave with amplitude 1/8.
- </p>
- <p>The audio signal is bit-exact.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">frequency, f</samp></dt>
- <dd><p>Set the carrier frequency. Default is 440 Hz.
- </p>
- </dd>
- <dt><samp class="option">beep_factor, b</samp></dt>
- <dd><p>Enable a periodic beep every second with frequency <var class="var">beep_factor</var> times
- the carrier frequency. Default is 0, meaning the beep is disabled.
- </p>
- </dd>
- <dt><samp class="option">sample_rate, r</samp></dt>
- <dd><p>Specify the sample rate, default is 44100.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Specify the duration of the generated audio stream.
- </p>
- </dd>
- <dt><samp class="option">samples_per_frame</samp></dt>
- <dd><p>Set the number of samples per output frame.
- </p>
- <p>The expression can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>The (sequential) number of the output audio frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>The PTS (Presentation TimeStamp) of the output audio frame,
- expressed in <var class="var">TB</var> units.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The PTS of the output audio frame, expressed in seconds.
- </p>
- </dd>
- <dt><samp class="option">TB</samp></dt>
- <dd><p>The timebase of the output audio frames.
- </p></dd>
- </dl>
- <p>Default is <code class="code">1024</code>.
- </p></dd>
- </dl>
- <a name="Examples-89"></a>
- <h4 class="subsection">37.11.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-89" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-89" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate a simple 440 Hz sine wave:
- <div class="example">
- <pre class="example-preformatted">sine
- </pre></div>
- </li><li>Generate a 220 Hz sine wave with a 880 Hz beep each second, for 5 seconds:
- <div class="example">
- <pre class="example-preformatted">sine=220:4:d=5
- sine=f=220:b=4:d=5
- sine=frequency=220:beep_factor=4:duration=5
- </pre></div>
- </li><li>Generate a 1 kHz sine wave following <code class="code">1602,1601,1602,1601,1602</code> NTSC
- pattern:
- <div class="example">
- <pre class="example-preformatted">sine=1000:samples_per_frame='st(0,mod(n,5)); 1602-not(not(eq(ld(0),1)+eq(ld(0),3)))'
- </pre></div>
- </li></ul>
- <a name="Audio-Sinks"></a>
- <h2 class="chapter">38 Audio Sinks<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Sinks" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Sinks" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available audio sinks.
- </p>
- <a name="abuffersink"></a>
- <h3 class="section">38.1 abuffersink<span class="pull-right"><a class="anchor hidden-xs" href="#abuffersink" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-abuffersink" aria-hidden="true">TOC</a></span></h3>
- <p>Buffer audio frames, and make them available to the end of filter chain.
- </p>
- <p>This sink is mainly intended for programmatic use, in particular
- through the interface defined in <samp class="file">libavfilter/buffersink.h</samp>
- or the options system.
- </p>
- <p>It accepts a pointer to an AVABufferSinkContext structure, which
- defines the incoming buffers’ formats, to be passed as the opaque
- parameter to <code class="code">avfilter_init_filter</code> for initialization.
- </p><a name="anullsink"></a>
- <h3 class="section">38.2 anullsink<span class="pull-right"><a class="anchor hidden-xs" href="#anullsink" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-anullsink" aria-hidden="true">TOC</a></span></h3>
- <p>Null audio sink; do absolutely nothing with the input audio. It is
- mainly useful as a template and for use in analysis / debugging
- tools.
- </p>
- <a name="Video-Filters"></a>
- <h2 class="chapter">39 Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>When you configure your FFmpeg build, you can disable any of the
- existing filters using <code class="code">--disable-filters</code>.
- The configure output will show the video filters included in your
- build.
- </p>
- <p>Below is a description of the currently available video filters.
- </p>
- <a name="addroi"></a>
- <h3 class="section">39.1 addroi<span class="pull-right"><a class="anchor hidden-xs" href="#addroi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-addroi" aria-hidden="true">TOC</a></span></h3>
- <p>Mark a region of interest in a video frame.
- </p>
- <p>The frame data is passed through unchanged, but metadata is attached
- to the frame indicating regions of interest which can affect the
- behaviour of later encoding. Multiple regions can be marked by
- applying the filter multiple times.
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dd><p>Region distance in pixels from the left edge of the frame.
- </p></dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Region distance in pixels from the top edge of the frame.
- </p></dd>
- <dt><samp class="option">w</samp></dt>
- <dd><p>Region width in pixels.
- </p></dd>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Region height in pixels.
- </p>
- <p>The parameters <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var> and <var class="var">h</var> are expressions,
- and may contain the following variables:
- </p><dl class="table">
- <dt><samp class="option">iw</samp></dt>
- <dd><p>Width of the input frame.
- </p></dd>
- <dt><samp class="option">ih</samp></dt>
- <dd><p>Height of the input frame.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">qoffset</samp></dt>
- <dd><p>Quantisation offset to apply within the region.
- </p>
- <p>This must be a real value in the range -1 to +1. A value of zero
- indicates no quality change. A negative value asks for better quality
- (less quantisation), while a positive value asks for worse quality
- (greater quantisation).
- </p>
- <p>The range is calibrated so that the extreme values indicate the
- largest possible offset - if the rest of the frame is encoded with the
- worst possible quality, an offset of -1 indicates that this region
- should be encoded with the best possible quality anyway. Intermediate
- values are then interpolated in some codec-dependent way.
- </p>
- <p>For example, in 10-bit H.264 the quantisation parameter varies between
- -12 and 51. A typical qoffset value of -1/10 therefore indicates that
- this region should be encoded with a QP around one-tenth of the full
- range better than the rest of the frame. So, if most of the frame
- were to be encoded with a QP of around 30, this region would get a QP
- of around 24 (an offset of approximately -1/10 * (51 - -12) = -6.3).
- An extreme value of -1 would indicate that this region should be
- encoded with the best possible quality regardless of the treatment of
- the rest of the frame - that is, should be encoded at a QP of -12.
- </p></dd>
- <dt><samp class="option">clear</samp></dt>
- <dd><p>If set to true, remove any existing regions of interest marked on the
- frame before adding the new one.
- </p></dd>
- </dl>
- <a name="Examples-90"></a>
- <h4 class="subsection">39.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-90" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-90" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Mark the centre quarter of the frame as interesting.
- <div class="example">
- <pre class="example-preformatted">addroi=iw/4:ih/4:iw/2:ih/2:-1/10
- </pre></div>
- </li><li>Mark the 100-pixel-wide region on the left edge of the frame as very
- uninteresting (to be encoded at much lower quality than the rest of
- the frame).
- <div class="example">
- <pre class="example-preformatted">addroi=0:0:100:ih:+1/5
- </pre></div>
- </li></ul>
- <a name="alphaextract"></a>
- <h3 class="section">39.2 alphaextract<span class="pull-right"><a class="anchor hidden-xs" href="#alphaextract" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alphaextract" aria-hidden="true">TOC</a></span></h3>
- <p>Extract the alpha component from the input as a grayscale video. This
- is especially useful with the <var class="var">alphamerge</var> filter.
- </p>
- <a name="alphamerge"></a>
- <h3 class="section">39.3 alphamerge<span class="pull-right"><a class="anchor hidden-xs" href="#alphamerge" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alphamerge" aria-hidden="true">TOC</a></span></h3>
- <p>Add or replace the alpha component of the primary input with the
- grayscale value of a second input. This is intended for use with
- <var class="var">alphaextract</var> to allow the transmission or storage of frame
- sequences that have alpha in a format that doesn’t support an alpha
- channel.
- </p>
- <p>For example, to reconstruct full frames from a normal YUV-encoded video
- and a separate video created with <var class="var">alphaextract</var>, you might use:
- </p><div class="example">
- <pre class="example-preformatted">movie=in_alpha.mkv [alpha]; [in][alpha] alphamerge [out]
- </pre></div>
- <a name="amplify"></a>
- <h3 class="section">39.4 amplify<span class="pull-right"><a class="anchor hidden-xs" href="#amplify" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amplify" aria-hidden="true">TOC</a></span></h3>
- <p>Amplify differences between current pixel and pixels of adjacent frames in
- same pixel location.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set frame radius. Default is 2. Allowed range is from 1 to 63.
- For example radius of 3 will instruct filter to calculate average of 7 frames.
- </p>
- </dd>
- <dt><samp class="option">factor</samp></dt>
- <dd><p>Set factor to amplify difference. Default is 2. Allowed range is from 0 to 65535.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set threshold for difference amplification. Any difference greater or equal to
- this value will not alter source pixel. Default is 10.
- Allowed range is from 0 to 65535.
- </p>
- </dd>
- <dt><samp class="option">tolerance</samp></dt>
- <dd><p>Set tolerance for difference amplification. Any difference lower to
- this value will not alter source pixel. Default is 0.
- Allowed range is from 0 to 65535.
- </p>
- </dd>
- <dt><samp class="option">low</samp></dt>
- <dd><p>Set lower limit for changing source pixel. Default is 65535. Allowed range is from 0 to 65535.
- This option controls maximum possible value that will decrease source pixel value.
- </p>
- </dd>
- <dt><samp class="option">high</samp></dt>
- <dd><p>Set high limit for changing source pixel. Default is 65535. Allowed range is from 0 to 65535.
- This option controls maximum possible value that will increase source pixel value.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default is all. Allowed range is from 0 to 15.
- </p></dd>
- </dl>
- <a name="Commands-54"></a>
- <h4 class="subsection">39.4.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-54" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-54" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following <a class="ref" href="#commands">commands</a> that corresponds to option of same name:
- </p><dl class="table">
- <dt><samp class="option">factor</samp></dt>
- <dt><samp class="option">threshold</samp></dt>
- <dt><samp class="option">tolerance</samp></dt>
- <dt><samp class="option">low</samp></dt>
- <dt><samp class="option">high</samp></dt>
- <dt><samp class="option">planes</samp></dt>
- </dl>
- <a name="ass-1"></a>
- <h3 class="section">39.5 ass<span class="pull-right"><a class="anchor hidden-xs" href="#ass-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ass-1" aria-hidden="true">TOC</a></span></h3>
- <p>Same as the <a class="ref" href="#subtitles">subtitles</a> filter, except that it doesn’t require libavcodec
- and libavformat to work. On the other hand, it is limited to ASS (Advanced
- Substation Alpha) subtitles files.
- </p>
- <p>This filter accepts the following option in addition to the common options from
- the <a class="ref" href="#subtitles">subtitles</a> filter:
- </p>
- <dl class="table">
- <dt><samp class="option">shaping</samp></dt>
- <dd><p>Set the shaping engine
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>The default libass shaping engine, which is the best available.
- </p></dd>
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dd><p>Fast, font-agnostic shaper that can do only substitutions
- </p></dd>
- <dt>‘<samp class="samp">complex</samp>’</dt>
- <dd><p>Slower shaper using OpenType for substitutions and positioning
- </p></dd>
- </dl>
- <p>The default is <code class="code">auto</code>.
- </p></dd>
- </dl>
- <a name="atadenoise"></a>
- <h3 class="section">39.6 atadenoise<span class="pull-right"><a class="anchor hidden-xs" href="#atadenoise" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-atadenoise" aria-hidden="true">TOC</a></span></h3>
- <p>Apply an Adaptive Temporal Averaging Denoiser to the video input.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">0a</samp></dt>
- <dd><p>Set threshold A for 1st plane. Default is 0.02.
- Valid range is 0 to 0.3.
- </p>
- </dd>
- <dt><samp class="option">0b</samp></dt>
- <dd><p>Set threshold B for 1st plane. Default is 0.04.
- Valid range is 0 to 5.
- </p>
- </dd>
- <dt><samp class="option">1a</samp></dt>
- <dd><p>Set threshold A for 2nd plane. Default is 0.02.
- Valid range is 0 to 0.3.
- </p>
- </dd>
- <dt><samp class="option">1b</samp></dt>
- <dd><p>Set threshold B for 2nd plane. Default is 0.04.
- Valid range is 0 to 5.
- </p>
- </dd>
- <dt><samp class="option">2a</samp></dt>
- <dd><p>Set threshold A for 3rd plane. Default is 0.02.
- Valid range is 0 to 0.3.
- </p>
- </dd>
- <dt><samp class="option">2b</samp></dt>
- <dd><p>Set threshold B for 3rd plane. Default is 0.04.
- Valid range is 0 to 5.
- </p>
- <p>Threshold A is designed to react on abrupt changes in the input signal and
- threshold B is designed to react on continuous changes in the input signal.
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set number of frames filter will use for averaging. Default is 9. Must be odd
- number in range [5, 129].
- </p>
- </dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>Set what planes of frame filter will use for averaging. Default is all.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>Set what variant of algorithm filter will use for averaging. Default is <code class="code">p</code> parallel.
- Alternatively can be set to <code class="code">s</code> serial.
- </p>
- <p>Parallel can be faster then serial, while other way around is never true.
- Parallel will abort early on first change being greater then thresholds, while serial
- will continue processing other side of frames if they are equal or below thresholds.
- </p>
- </dd>
- <dt><samp class="option">0s</samp></dt>
- <dt><samp class="option">1s</samp></dt>
- <dt><samp class="option">2s</samp></dt>
- <dd><p>Set sigma for 1st plane, 2nd plane or 3rd plane. Default is 32767.
- Valid range is from 0 to 32767.
- This options controls weight for each pixel in radius defined by size.
- Default value means every pixel have same weight.
- Setting this option to 0 effectively disables filtering.
- </p></dd>
- </dl>
- <a name="Commands-55"></a>
- <h4 class="subsection">39.6.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-55" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-55" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options except option <code class="code">s</code>.
- The command accepts the same syntax of the corresponding option.
- </p>
- <a name="avgblur"></a>
- <h3 class="section">39.7 avgblur<span class="pull-right"><a class="anchor hidden-xs" href="#avgblur" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avgblur" aria-hidden="true">TOC</a></span></h3>
- <p>Apply average blur filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sizeX</samp></dt>
- <dd><p>Set horizontal radius size.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. By default all planes are filtered.
- </p>
- </dd>
- <dt><samp class="option">sizeY</samp></dt>
- <dd><p>Set vertical radius size, if zero it will be same as <code class="code">sizeX</code>.
- Default is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="Commands-56"></a>
- <h4 class="subsection">39.7.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-56" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-56" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same commands as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="backgroundkey"></a>
- <h3 class="section">39.8 backgroundkey<span class="pull-right"><a class="anchor hidden-xs" href="#backgroundkey" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-backgroundkey" aria-hidden="true">TOC</a></span></h3>
- <p>Turns a static background into transparency.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Threshold for scene change detection.
- </p></dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Similarity percentage with the background.
- </p></dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Set the blend amount for pixels that are not similar.
- </p></dd>
- </dl>
- <a name="Commands-57"></a>
- <h4 class="subsection">39.8.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-57" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-57" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="bbox"></a>
- <h3 class="section">39.9 bbox<span class="pull-right"><a class="anchor hidden-xs" href="#bbox" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bbox" aria-hidden="true">TOC</a></span></h3>
- <p>Compute the bounding box for the non-black pixels in the input frame
- luma plane.
- </p>
- <p>This filter computes the bounding box containing all the pixels with a
- luma value greater than the minimum allowed value.
- The parameters describing the bounding box are printed on the filter
- log.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">min_val</samp></dt>
- <dd><p>Set the minimal luma value. Default is <code class="code">16</code>.
- </p></dd>
- </dl>
- <a name="Commands-58"></a>
- <h4 class="subsection">39.9.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-58" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-58" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="bilateral"></a>
- <h3 class="section">39.10 bilateral<span class="pull-right"><a class="anchor hidden-xs" href="#bilateral" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bilateral" aria-hidden="true">TOC</a></span></h3>
- <p>Apply bilateral filter, spatial smoothing while preserving edges.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">sigmaS</samp></dt>
- <dd><p>Set sigma of gaussian function to calculate spatial weight.
- Allowed range is 0 to 512. Default is 0.1.
- </p>
- </dd>
- <dt><samp class="option">sigmaR</samp></dt>
- <dd><p>Set sigma of gaussian function to calculate range weight.
- Allowed range is 0 to 1. Default is 0.1.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default is first only.
- </p></dd>
- </dl>
- <a name="Commands-59"></a>
- <h4 class="subsection">39.10.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-59" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-59" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="bitplanenoise"></a>
- <h3 class="section">39.11 bitplanenoise<span class="pull-right"><a class="anchor hidden-xs" href="#bitplanenoise" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bitplanenoise" aria-hidden="true">TOC</a></span></h3>
- <p>Show and measure bit plane noise.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">bitplane</samp></dt>
- <dd><p>Set which plane to analyze. Default is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">filter</samp></dt>
- <dd><p>Filter out noisy pixels from <code class="code">bitplane</code> set above.
- Default is disabled.
- </p></dd>
- </dl>
- <a name="blackdetect_002c-blackdetect_005fvulkan"></a>
- <h3 class="section">39.12 blackdetect, blackdetect_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#blackdetect_002c-blackdetect_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-blackdetect_002c-blackdetect_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Detect video intervals that are (almost) completely black. Can be
- useful to detect chapter transitions, commercials, or invalid
- recordings.
- </p>
- <p>The filter outputs its detection analysis to both the log as well as
- frame metadata. If a black segment of at least the specified minimum
- duration is found, a line with the start and end timestamps as well
- as duration is printed to the log with level <code class="code">info</code>. In addition,
- a log line with level <code class="code">debug</code> is printed per frame showing the
- black amount detected for that frame.
- </p>
- <p>The filter also attaches metadata to the first frame of a black
- segment with key <code class="code">lavfi.black_start</code> and to the first frame
- after the black segment ends with key <code class="code">lavfi.black_end</code>. The
- value is the frame’s timestamp. This metadata is added regardless
- of the minimum duration specified.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">black_min_duration, d</samp></dt>
- <dd><p>Set the minimum detected black duration expressed in seconds. It must
- be a non-negative floating point number.
- </p>
- <p>Default value is 2.0.
- </p>
- </dd>
- <dt><samp class="option">picture_black_ratio_th, pic_th</samp></dt>
- <dd><p>Set the threshold for considering a picture "black".
- Express the minimum value for the ratio:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">nb_black_pixels</var> / <var class="var">nb_pixels</var>
- </pre></div>
- <p>for which a picture is considered black.
- Default value is 0.98.
- </p>
- </dd>
- <dt><samp class="option">pixel_black_th, pix_th</samp></dt>
- <dd><p>Set the threshold for considering a pixel "black".
- </p>
- <p>The threshold expresses the maximum pixel luma value for which a
- pixel is considered "black". The provided value is scaled according to
- the following equation:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">absolute_threshold</var> = <var class="var">luma_minimum_value</var> + <var class="var">pixel_black_th</var> * <var class="var">luma_range_size</var>
- </pre></div>
- <p><var class="var">luma_range_size</var> and <var class="var">luma_minimum_value</var> depend on
- the input video format, the range is [0-255] for YUV full-range
- formats and [16-235] for YUV non full-range formats.
- </p>
- <p>Default value is 0.10.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>If true, check the alpha channel instead of the luma channel. Detects frames
- which are (almost) transparent, instead of frames which are almost black.
- </p>
- <p>Default value is disabled.
- </p></dd>
- </dl>
- <p>The following example sets the maximum pixel threshold to the minimum
- value, and detects only black intervals of 2 or more seconds:
- </p><div class="example">
- <pre class="example-preformatted">blackdetect=d=2:pix_th=0.00
- </pre></div>
- <a name="blackframe"></a>
- <h3 class="section">39.13 blackframe<span class="pull-right"><a class="anchor hidden-xs" href="#blackframe" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-blackframe" aria-hidden="true">TOC</a></span></h3>
- <p>Detect frames that are (almost) completely black. Can be useful to
- detect chapter transitions or commercials. Output lines consist of
- the frame number of the detected frame, the percentage of blackness,
- the position in the file if known or -1 and the timestamp in seconds.
- </p>
- <p>In order to display the output lines, you need to set the loglevel at
- least to the AV_LOG_INFO value.
- </p>
- <p>This filter exports frame metadata <code class="code">lavfi.blackframe.pblack</code>.
- The value represents the percentage of pixels in the picture that
- are below the threshold value.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">amount</samp></dt>
- <dd><p>The percentage of the pixels that have to be below the threshold; it defaults to
- <code class="code">98</code>.
- </p>
- </dd>
- <dt><samp class="option">threshold, thresh</samp></dt>
- <dd><p>The threshold below which a pixel value is considered black; it defaults to
- <code class="code">32</code>.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="blend"></a><a name="blend-1"></a>
- <h3 class="section">39.14 blend<span class="pull-right"><a class="anchor hidden-xs" href="#blend-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-blend-1" aria-hidden="true">TOC</a></span></h3>
- <p>Blend two video frames into each other.
- </p>
- <p>The <code class="code">blend</code> filter takes two input streams and outputs one
- stream, the first input is the "top" layer and second input is
- "bottom" layer. By default, the output terminates when the longest input terminates.
- </p>
- <p>The <code class="code">tblend</code> (time blend) filter takes two consecutive frames
- from one single stream, and outputs the result obtained by blending
- the new frame on top of the old frame.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">c0_mode</samp></dt>
- <dt><samp class="option">c1_mode</samp></dt>
- <dt><samp class="option">c2_mode</samp></dt>
- <dt><samp class="option">c3_mode</samp></dt>
- <dt><samp class="option">all_mode</samp></dt>
- <dd><p>Set blend mode for specific pixel component or all pixel components in case
- of <var class="var">all_mode</var>. Default value is <code class="code">normal</code>.
- </p>
- <p>Available values for component modes are:
- </p><dl class="table">
- <dt>‘<samp class="samp">addition</samp>’</dt>
- <dt>‘<samp class="samp">and</samp>’</dt>
- <dt>‘<samp class="samp">average</samp>’</dt>
- <dt>‘<samp class="samp">bleach</samp>’</dt>
- <dt>‘<samp class="samp">burn</samp>’</dt>
- <dt>‘<samp class="samp">darken</samp>’</dt>
- <dt>‘<samp class="samp">difference</samp>’</dt>
- <dt>‘<samp class="samp">divide</samp>’</dt>
- <dt>‘<samp class="samp">dodge</samp>’</dt>
- <dt>‘<samp class="samp">exclusion</samp>’</dt>
- <dt>‘<samp class="samp">extremity</samp>’</dt>
- <dt>‘<samp class="samp">freeze</samp>’</dt>
- <dt>‘<samp class="samp">geometric</samp>’</dt>
- <dt>‘<samp class="samp">glow</samp>’</dt>
- <dt>‘<samp class="samp">grainextract</samp>’</dt>
- <dt>‘<samp class="samp">grainmerge</samp>’</dt>
- <dt>‘<samp class="samp">hardlight</samp>’</dt>
- <dt>‘<samp class="samp">hardmix</samp>’</dt>
- <dt>‘<samp class="samp">hardoverlay</samp>’</dt>
- <dt>‘<samp class="samp">harmonic</samp>’</dt>
- <dt>‘<samp class="samp">heat</samp>’</dt>
- <dt>‘<samp class="samp">interpolate</samp>’</dt>
- <dt>‘<samp class="samp">lighten</samp>’</dt>
- <dt>‘<samp class="samp">linearlight</samp>’</dt>
- <dt>‘<samp class="samp">multiply</samp>’</dt>
- <dt>‘<samp class="samp">multiply128</samp>’</dt>
- <dt>‘<samp class="samp">negation</samp>’</dt>
- <dt>‘<samp class="samp">normal</samp>’</dt>
- <dt>‘<samp class="samp">or</samp>’</dt>
- <dt>‘<samp class="samp">overlay</samp>’</dt>
- <dt>‘<samp class="samp">phoenix</samp>’</dt>
- <dt>‘<samp class="samp">pinlight</samp>’</dt>
- <dt>‘<samp class="samp">reflect</samp>’</dt>
- <dt>‘<samp class="samp">screen</samp>’</dt>
- <dt>‘<samp class="samp">softdifference</samp>’</dt>
- <dt>‘<samp class="samp">softlight</samp>’</dt>
- <dt>‘<samp class="samp">stain</samp>’</dt>
- <dt>‘<samp class="samp">subtract</samp>’</dt>
- <dt>‘<samp class="samp">vividlight</samp>’</dt>
- <dt>‘<samp class="samp">xor</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">c0_opacity</samp></dt>
- <dt><samp class="option">c1_opacity</samp></dt>
- <dt><samp class="option">c2_opacity</samp></dt>
- <dt><samp class="option">c3_opacity</samp></dt>
- <dt><samp class="option">all_opacity</samp></dt>
- <dd><p>Set blend opacity for specific pixel component or all pixel components in case
- of <var class="var">all_opacity</var>. Only used in combination with pixel component blend modes.
- </p>
- </dd>
- <dt><samp class="option">c0_expr</samp></dt>
- <dt><samp class="option">c1_expr</samp></dt>
- <dt><samp class="option">c2_expr</samp></dt>
- <dt><samp class="option">c3_expr</samp></dt>
- <dt><samp class="option">all_expr</samp></dt>
- <dd><p>Set blend expression for specific pixel component or all pixel components in case
- of <var class="var">all_expr</var>. Note that related mode options will be ignored if those are set.
- </p>
- <p>The expressions can use the following variables:
- </p>
- <dl class="table">
- <dt><samp class="option">N</samp></dt>
- <dd><p>The sequential number of the filtered frame, starting from <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">X</samp></dt>
- <dt><samp class="option">Y</samp></dt>
- <dd><p>the coordinates of the current sample
- </p>
- </dd>
- <dt><samp class="option">W</samp></dt>
- <dt><samp class="option">H</samp></dt>
- <dd><p>the width and height of currently filtered plane
- </p>
- </dd>
- <dt><samp class="option">SW</samp></dt>
- <dt><samp class="option">SH</samp></dt>
- <dd><p>Width and height scale for the plane being filtered. It is the
- ratio between the dimensions of the current plane to the luma plane,
- e.g. for a <code class="code">yuv420p</code> frame, the values are <code class="code">1,1</code> for
- the luma plane and <code class="code">0.5,0.5</code> for the chroma planes.
- </p>
- </dd>
- <dt><samp class="option">T</samp></dt>
- <dd><p>Time of the current frame, expressed in seconds.
- </p>
- </dd>
- <dt><samp class="option">TOP, A</samp></dt>
- <dd><p>Value of pixel component at current location for first video frame (top layer).
- </p>
- </dd>
- <dt><samp class="option">BOTTOM, B</samp></dt>
- <dd><p>Value of pixel component at current location for second video frame (bottom layer).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>The <code class="code">blend</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="Examples-91"></a>
- <h4 class="subsection">39.14.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-91" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-91" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply transition from bottom layer to top layer in first 10 seconds:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='A*(if(gte(T,10),1,T/10))+B*(1-(if(gte(T,10),1,T/10)))'
- </pre></div>
- </li><li>Apply linear horizontal transition from top layer to bottom layer:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='A*(X/W)+B*(1-X/W)'
- </pre></div>
- </li><li>Apply 1x1 checkerboard effect:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
- </pre></div>
- </li><li>Apply uncover left effect:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='if(gte(N*SW+X,W),A,B)'
- </pre></div>
- </li><li>Apply uncover down effect:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='if(gte(Y-N*SH,0),A,B)'
- </pre></div>
- </li><li>Apply uncover up-left effect:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='if(gte(T*SH*40+Y,H)*gte((T*40*SW+X)*W/H,W),A,B)'
- </pre></div>
- </li><li>Split diagonally video and shows top and bottom layer on each side:
- <div class="example">
- <pre class="example-preformatted">blend=all_expr='if(gt(X,Y*(W/H)),A,B)'
- </pre></div>
- </li><li>Display differences between the current and the previous frame:
- <div class="example">
- <pre class="example-preformatted">tblend=all_mode=grainextract
- </pre></div>
- </li></ul>
- <a name="Commands-60"></a>
- <h4 class="subsection">39.14.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-60" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-60" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a class="anchor" id="blockdetect"></a><a name="blockdetect-1"></a>
- <h3 class="section">39.15 blockdetect<span class="pull-right"><a class="anchor hidden-xs" href="#blockdetect-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-blockdetect-1" aria-hidden="true">TOC</a></span></h3>
- <p>Determines blockiness of frames without altering the input frames.
- </p>
- <p>Based on Remco Muijs and Ihor Kirenko: "A no-reference blocking artifact measure for adaptive video processing." 2005 13th European signal processing conference.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">period_min</samp></dt>
- <dt><samp class="option">period_max</samp></dt>
- <dd><p>Set minimum and maximum values for determining pixel grids (periods).
- Default values are [3,24].
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default is first only.
- </p></dd>
- </dl>
- <a name="Examples-92"></a>
- <h4 class="subsection">39.15.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-92" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-92" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Determine blockiness for the first plane and search for periods within [8,32]:
- <div class="example">
- <pre class="example-preformatted">blockdetect=period_min=8:period_max=32:planes=1
- </pre></div>
- </li></ul>
- <a class="anchor" id="blurdetect"></a><a name="blurdetect-1"></a>
- <h3 class="section">39.16 blurdetect<span class="pull-right"><a class="anchor hidden-xs" href="#blurdetect-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-blurdetect-1" aria-hidden="true">TOC</a></span></h3>
- <p>Determines blurriness of frames without altering the input frames.
- </p>
- <p>Based on Marziliano, Pina, et al. "A no-reference perceptual blur metric."
- Allows for a block-based abbreviation.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">low</samp></dt>
- <dt><samp class="option">high</samp></dt>
- <dd><p>Set low and high threshold values used by the Canny thresholding
- algorithm.
- </p>
- <p>The high threshold selects the "strong" edge pixels, which are then
- connected through 8-connectivity with the "weak" edge pixels selected
- by the low threshold.
- </p>
- <p><var class="var">low</var> and <var class="var">high</var> threshold values must be chosen in the range
- [0,1], and <var class="var">low</var> should be lesser or equal to <var class="var">high</var>.
- </p>
- <p>Default value for <var class="var">low</var> is <code class="code">20/255</code>, and default value for <var class="var">high</var>
- is <code class="code">50/255</code>.
- </p>
- </dd>
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Define the radius to search around an edge pixel for local maxima.
- </p>
- </dd>
- <dt><samp class="option">block_pct</samp></dt>
- <dd><p>Determine blurriness only for the most significant blocks, given in percentage.
- </p>
- </dd>
- <dt><samp class="option">block_width</samp></dt>
- <dd><p>Determine blurriness for blocks of width <var class="var">block_width</var>. If set to any value smaller 1, no blocks are used and the whole image is processed as one no matter of <var class="var">block_height</var>.
- </p>
- </dd>
- <dt><samp class="option">block_height</samp></dt>
- <dd><p>Determine blurriness for blocks of height <var class="var">block_height</var>. If set to any value smaller 1, no blocks are used and the whole image is processed as one no matter of <var class="var">block_width</var>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default is first only.
- </p></dd>
- </dl>
- <a name="Examples-93"></a>
- <h4 class="subsection">39.16.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-93" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-93" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Determine blur for 80% of most significant 32x32 blocks:
- <div class="example">
- <pre class="example-preformatted">blurdetect=block_width=32:block_height=32:block_pct=80
- </pre></div>
- </li></ul>
- <a name="bm3d"></a>
- <h3 class="section">39.17 bm3d<span class="pull-right"><a class="anchor hidden-xs" href="#bm3d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bm3d" aria-hidden="true">TOC</a></span></h3>
- <p>Denoise frames using Block-Matching 3D algorithm.
- </p>
- <p>The filter accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>Set denoising strength. Default value is 1.
- Allowed range is from 0 to 999.9.
- The denoising algorithm is very sensitive to sigma, so adjust it
- according to the source.
- </p>
- </dd>
- <dt><samp class="option">block</samp></dt>
- <dd><p>Set local patch size. This sets dimensions in 2D.
- </p>
- </dd>
- <dt><samp class="option">bstep</samp></dt>
- <dd><p>Set sliding step for processing blocks. Default value is 4.
- Allowed range is from 1 to 64.
- Smaller values allows processing more reference blocks and is slower.
- </p>
- </dd>
- <dt><samp class="option">group</samp></dt>
- <dd><p>Set maximal number of similar blocks for 3rd dimension. Default value is 1.
- When set to 1, no block matching is done. Larger values allows more blocks
- in single group.
- Allowed range is from 1 to 256.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Set radius for search block matching. Default is 9.
- Allowed range is from 1 to INT32_MAX.
- </p>
- </dd>
- <dt><samp class="option">mstep</samp></dt>
- <dd><p>Set step between two search locations for block matching. Default is 1.
- Allowed range is from 1 to 64. Smaller is slower.
- </p>
- </dd>
- <dt><samp class="option">thmse</samp></dt>
- <dd><p>Set threshold of mean square error for block matching. Valid range is 0 to
- INT32_MAX.
- </p>
- </dd>
- <dt><samp class="option">hdthr</samp></dt>
- <dd><p>Set thresholding parameter for hard thresholding in 3D transformed domain.
- Larger values results in stronger hard-thresholding filtering in frequency
- domain.
- </p>
- </dd>
- <dt><samp class="option">estim</samp></dt>
- <dd><p>Set filtering estimation mode. Can be <code class="code">basic</code> or <code class="code">final</code>.
- Default is <code class="code">basic</code>.
- </p>
- </dd>
- <dt><samp class="option">ref</samp></dt>
- <dd><p>If enabled, filter will use 2nd stream for block matching.
- Default is disabled for <code class="code">basic</code> value of <var class="var">estim</var> option,
- and always enabled if value of <var class="var">estim</var> is <code class="code">final</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default is all available except alpha.
- </p></dd>
- </dl>
- <a name="Examples-94"></a>
- <h4 class="subsection">39.17.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-94" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-94" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Basic filtering with bm3d:
- <div class="example">
- <pre class="example-preformatted">bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic
- </pre></div>
- </li><li>Same as above, but filtering only luma:
- <div class="example">
- <pre class="example-preformatted">bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic:planes=1
- </pre></div>
- </li><li>Same as above, but with both estimation modes:
- <div class="example">
- <pre class="example-preformatted">split[a][b],[a]bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic[a],[b][a]bm3d=sigma=3:block=4:bstep=2:group=16:estim=final:ref=1
- </pre></div>
- </li><li>Same as above, but prefilter with <a class="ref" href="#nlmeans">nlmeans</a> filter instead:
- <div class="example">
- <pre class="example-preformatted">split[a][b],[a]nlmeans=s=3:r=7:p=3[a],[b][a]bm3d=sigma=3:block=4:bstep=2:group=16:estim=final:ref=1
- </pre></div>
- </li></ul>
- <a name="boxblur"></a>
- <h3 class="section">39.18 boxblur<span class="pull-right"><a class="anchor hidden-xs" href="#boxblur" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-boxblur" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a boxblur algorithm to the input video.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_radius, lr</samp></dt>
- <dt><samp class="option">luma_power, lp</samp></dt>
- <dt><samp class="option">chroma_radius, cr</samp></dt>
- <dt><samp class="option">chroma_power, cp</samp></dt>
- <dt><samp class="option">alpha_radius, ar</samp></dt>
- <dt><samp class="option">alpha_power, ap</samp></dt>
- </dl>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">luma_radius, lr</samp></dt>
- <dt><samp class="option">chroma_radius, cr</samp></dt>
- <dt><samp class="option">alpha_radius, ar</samp></dt>
- <dd><p>Set an expression for the box radius in pixels used for blurring the
- corresponding input plane.
- </p>
- <p>The radius value must be a non-negative number, and must not be
- greater than the value of the expression <code class="code">min(w,h)/2</code> for the
- luma and alpha planes, and of <code class="code">min(cw,ch)/2</code> for the chroma
- planes.
- </p>
- <p>Default value for <samp class="option">luma_radius</samp> is "2". If not specified,
- <samp class="option">chroma_radius</samp> and <samp class="option">alpha_radius</samp> default to the
- corresponding value set for <samp class="option">luma_radius</samp>.
- </p>
- <p>The expressions can contain the following constants:
- </p><dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The input width and height in pixels.
- </p>
- </dd>
- <dt><samp class="option">cw</samp></dt>
- <dt><samp class="option">ch</samp></dt>
- <dd><p>The input chroma image width and height in pixels.
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>The horizontal and vertical chroma subsample values. For example, for the
- pixel format "yuv422p", <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">luma_power, lp</samp></dt>
- <dt><samp class="option">chroma_power, cp</samp></dt>
- <dt><samp class="option">alpha_power, ap</samp></dt>
- <dd><p>Specify how many times the boxblur filter is applied to the
- corresponding plane.
- </p>
- <p>Default value for <samp class="option">luma_power</samp> is 2. If not specified,
- <samp class="option">chroma_power</samp> and <samp class="option">alpha_power</samp> default to the
- corresponding value set for <samp class="option">luma_power</samp>.
- </p>
- <p>A value of 0 will disable the effect.
- </p></dd>
- </dl>
- <a name="Examples-95"></a>
- <h4 class="subsection">39.18.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-95" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-95" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply a boxblur filter with the luma, chroma, and alpha radii
- set to 2:
- <div class="example">
- <pre class="example-preformatted">boxblur=luma_radius=2:luma_power=1
- boxblur=2:1
- </pre></div>
- </li><li>Set the luma radius to 2, and alpha and chroma radius to 0:
- <div class="example">
- <pre class="example-preformatted">boxblur=2:1:cr=0:ar=0
- </pre></div>
- </li><li>Set the luma and chroma radii to a fraction of the video dimension:
- <div class="example">
- <pre class="example-preformatted">boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chroma_power=1
- </pre></div>
- </li></ul>
- <a class="anchor" id="bwdif"></a><a name="bwdif-1"></a>
- <h3 class="section">39.19 bwdif<span class="pull-right"><a class="anchor hidden-xs" href="#bwdif-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bwdif-1" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlace the input video ("bwdif" stands for "Bob Weaver
- Deinterlacing Filter").
- </p>
- <p>Motion adaptive deinterlacing based on yadif with the use of w3fdif and cubic
- interpolation algorithms.
- It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, send_frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">1, send_field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">send_field</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">1, bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">-1, auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following
- values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, all</samp></dt>
- <dd><p>Deinterlace all frames.
- </p></dd>
- <dt><samp class="option">1, interlaced</samp></dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">all</code>.
- </p></dd>
- </dl>
- <a name="ccrepack"></a>
- <h3 class="section">39.20 ccrepack<span class="pull-right"><a class="anchor hidden-xs" href="#ccrepack" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ccrepack" aria-hidden="true">TOC</a></span></h3>
- <p>Repack CEA-708 closed captioning side data
- </p>
- <p>This filter fixes various issues seen with commercial encoders
- related to upstream malformed CEA-708 payloads, specifically
- incorrect number of tuples (wrong cc_count for the target FPS),
- and incorrect ordering of tuples (i.e. the CEA-608 tuples are not at
- the first entries in the payload).
- </p>
- <a name="cas"></a>
- <h3 class="section">39.21 cas<span class="pull-right"><a class="anchor hidden-xs" href="#cas" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-cas" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Contrast Adaptive Sharpen filter to video stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Set the sharpening strength. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default value is to filter all
- planes except alpha plane.
- </p></dd>
- </dl>
- <a name="Commands-61"></a>
- <h4 class="subsection">39.21.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-61" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-61" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="chromahold"></a>
- <h3 class="section">39.22 chromahold<span class="pull-right"><a class="anchor hidden-xs" href="#chromahold" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromahold" aria-hidden="true">TOC</a></span></h3>
- <p>Remove all color information for all colors except for certain one.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>The color which will not be replaced with neutral chroma.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Similarity percentage with the above color.
- 0.01 matches only the exact key color, while 1.0 matches everything.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Blend percentage.
- 0.0 makes pixels either fully gray, or not gray at all.
- Higher values result in more preserved color.
- </p>
- </dd>
- <dt><samp class="option">yuv</samp></dt>
- <dd><p>Signals that the color passed is already in YUV instead of RGB.
- </p>
- <p>Literal colors like "green" or "red" don’t make sense with this enabled anymore.
- This can be used to pass exact YUV values as hexadecimal numbers.
- </p></dd>
- </dl>
- <a name="Commands-62"></a>
- <h4 class="subsection">39.22.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-62" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-62" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a class="anchor" id="chromakey"></a><a name="chromakey-1"></a>
- <h3 class="section">39.23 chromakey<span class="pull-right"><a class="anchor hidden-xs" href="#chromakey-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromakey-1" aria-hidden="true">TOC</a></span></h3>
- <p>YUV colorspace color/chroma keying.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>The color which will be replaced with transparency.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Similarity percentage with the key color.
- </p>
- <p>0.01 matches only the exact key color, while 1.0 matches everything.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Blend percentage.
- </p>
- <p>0.0 makes pixels either fully transparent, or not transparent at all.
- </p>
- <p>Higher values result in semi-transparent pixels, with a higher transparency
- the more similar the pixels color is to the key color.
- </p>
- </dd>
- <dt><samp class="option">yuv</samp></dt>
- <dd><p>Signals that the color passed is already in YUV instead of RGB.
- </p>
- <p>Literal colors like "green" or "red" don’t make sense with this enabled anymore.
- This can be used to pass exact YUV values as hexadecimal numbers.
- </p></dd>
- </dl>
- <a name="Commands-63"></a>
- <h4 class="subsection">39.23.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-63" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-63" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="Examples-96"></a>
- <h4 class="subsection">39.23.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-96" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-96" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make every green pixel in the input image transparent:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.png -vf chromakey=green out.png
- </pre></div>
- </li><li>Overlay a greenscreen-video on top of a static black background.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_complex "[1:v]chromakey=0x70de77:0.1:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.mkv
- </pre></div>
- </li></ul>
- <a name="chromanr"></a>
- <h3 class="section">39.24 chromanr<span class="pull-right"><a class="anchor hidden-xs" href="#chromanr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromanr" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce chrominance noise.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">thres</samp></dt>
- <dd><p>Set threshold for averaging chrominance values.
- Sum of absolute difference of Y, U and V pixel components of current
- pixel and neighbour pixels lower than this threshold will be used in
- averaging. Luma component is left unchanged and is copied to output.
- Default value is 30. Allowed range is from 1 to 200.
- </p>
- </dd>
- <dt><samp class="option">sizew</samp></dt>
- <dd><p>Set horizontal radius of rectangle used for averaging.
- Allowed range is from 1 to 100. Default value is 5.
- </p>
- </dd>
- <dt><samp class="option">sizeh</samp></dt>
- <dd><p>Set vertical radius of rectangle used for averaging.
- Allowed range is from 1 to 100. Default value is 5.
- </p>
- </dd>
- <dt><samp class="option">stepw</samp></dt>
- <dd><p>Set horizontal step when averaging. Default value is 1.
- Allowed range is from 1 to 50.
- Mostly useful to speed-up filtering.
- </p>
- </dd>
- <dt><samp class="option">steph</samp></dt>
- <dd><p>Set vertical step when averaging. Default value is 1.
- Allowed range is from 1 to 50.
- Mostly useful to speed-up filtering.
- </p>
- </dd>
- <dt><samp class="option">threy</samp></dt>
- <dd><p>Set Y threshold for averaging chrominance values.
- Set finer control for max allowed difference between Y components
- of current pixel and neighbour pixels.
- Default value is 200. Allowed range is from 1 to 200.
- </p>
- </dd>
- <dt><samp class="option">threu</samp></dt>
- <dd><p>Set U threshold for averaging chrominance values.
- Set finer control for max allowed difference between U components
- of current pixel and neighbour pixels.
- Default value is 200. Allowed range is from 1 to 200.
- </p>
- </dd>
- <dt><samp class="option">threv</samp></dt>
- <dd><p>Set V threshold for averaging chrominance values.
- Set finer control for max allowed difference between V components
- of current pixel and neighbour pixels.
- Default value is 200. Allowed range is from 1 to 200.
- </p>
- </dd>
- <dt><samp class="option">distance</samp></dt>
- <dd><p>Set distance type used in calculations.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">manhattan</samp>’</dt>
- <dd><p>Absolute difference.
- </p></dd>
- <dt>‘<samp class="samp">euclidean</samp>’</dt>
- <dd><p>Difference squared.
- </p></dd>
- </dl>
- <p>Default distance type is manhattan.
- </p></dd>
- </dl>
- <a name="Commands-64"></a>
- <h4 class="subsection">39.24.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-64" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-64" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <a name="chromashift"></a>
- <h3 class="section">39.25 chromashift<span class="pull-right"><a class="anchor hidden-xs" href="#chromashift" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromashift" aria-hidden="true">TOC</a></span></h3>
- <p>Shift chroma pixels horizontally and/or vertically.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">cbh</samp></dt>
- <dd><p>Set amount to shift chroma-blue horizontally.
- </p></dd>
- <dt><samp class="option">cbv</samp></dt>
- <dd><p>Set amount to shift chroma-blue vertically.
- </p></dd>
- <dt><samp class="option">crh</samp></dt>
- <dd><p>Set amount to shift chroma-red horizontally.
- </p></dd>
- <dt><samp class="option">crv</samp></dt>
- <dd><p>Set amount to shift chroma-red vertically.
- </p></dd>
- <dt><samp class="option">edge</samp></dt>
- <dd><p>Set edge mode, can be <var class="var">smear</var>, default, or <var class="var">warp</var>.
- </p></dd>
- </dl>
- <a name="Commands-65"></a>
- <h4 class="subsection">39.25.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-65" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-65" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="ciescope"></a>
- <h3 class="section">39.26 ciescope<span class="pull-right"><a class="anchor hidden-xs" href="#ciescope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ciescope" aria-hidden="true">TOC</a></span></h3>
- <p>Display CIE color diagram with pixels overlaid onto it.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">system</samp></dt>
- <dd><p>Set color system.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">ntsc, 470m</samp>’</dt>
- <dt>‘<samp class="samp">ebu, 470bg</samp>’</dt>
- <dt>‘<samp class="samp">smpte</samp>’</dt>
- <dt>‘<samp class="samp">240m</samp>’</dt>
- <dt>‘<samp class="samp">apple</samp>’</dt>
- <dt>‘<samp class="samp">widergb</samp>’</dt>
- <dt>‘<samp class="samp">cie1931</samp>’</dt>
- <dt>‘<samp class="samp">rec709, hdtv</samp>’</dt>
- <dt>‘<samp class="samp">uhdtv, rec2020</samp>’</dt>
- <dt>‘<samp class="samp">dcip3</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">cie</samp></dt>
- <dd><p>Set CIE system.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">xyy</samp>’</dt>
- <dt>‘<samp class="samp">ucs</samp>’</dt>
- <dt>‘<samp class="samp">luv</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">gamuts</samp></dt>
- <dd><p>Set what gamuts to draw.
- </p>
- <p>See <code class="code">system</code> option for available values.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set ciescope size, by default set to 512.
- </p>
- </dd>
- <dt><samp class="option">intensity, i</samp></dt>
- <dd><p>Set intensity used to map input pixel values to CIE diagram.
- </p>
- </dd>
- <dt><samp class="option">contrast</samp></dt>
- <dd><p>Set contrast used to draw tongue colors that are out of active color system gamut.
- </p>
- </dd>
- <dt><samp class="option">corrgamma</samp></dt>
- <dd><p>Correct gamma displayed on scope, by default enabled.
- </p>
- </dd>
- <dt><samp class="option">showwhite</samp></dt>
- <dd><p>Show white point on CIE diagram, by default disabled.
- </p>
- </dd>
- <dt><samp class="option">gamma</samp></dt>
- <dd><p>Set input gamma. Used only with XYZ input color space.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>Fill with CIE colors. By default is enabled.
- </p></dd>
- </dl>
- <a name="codecview"></a>
- <h3 class="section">39.27 codecview<span class="pull-right"><a class="anchor hidden-xs" href="#codecview" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-codecview" aria-hidden="true">TOC</a></span></h3>
- <p>Visualize information exported by some codecs.
- </p>
- <p>Some codecs can export information through frames using side-data or other
- means. For example, some MPEG based codecs export motion vectors through the
- <var class="var">export_mvs</var> flag in the codec <samp class="option">flags2</samp> option.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">block</samp></dt>
- <dd><p>Display block partition structure using the luma plane.
- </p>
- </dd>
- <dt><samp class="option">mv</samp></dt>
- <dd><p>Set motion vectors to visualize.
- </p>
- <p>Available flags for <var class="var">mv</var> are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">pf</samp>’</dt>
- <dd><p>forward predicted MVs of P-frames
- </p></dd>
- <dt>‘<samp class="samp">bf</samp>’</dt>
- <dd><p>forward predicted MVs of B-frames
- </p></dd>
- <dt>‘<samp class="samp">bb</samp>’</dt>
- <dd><p>backward predicted MVs of B-frames
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Display quantization parameters using the chroma planes.
- </p>
- </dd>
- <dt><samp class="option">mv_type, mvt</samp></dt>
- <dd><p>Set motion vectors type to visualize. Includes MVs from all frames unless specified by <var class="var">frame_type</var> option.
- </p>
- <p>Available flags for <var class="var">mv_type</var> are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">fp</samp>’</dt>
- <dd><p>forward predicted MVs
- </p></dd>
- <dt>‘<samp class="samp">bp</samp>’</dt>
- <dd><p>backward predicted MVs
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">frame_type, ft</samp></dt>
- <dd><p>Set frame type to visualize motion vectors of.
- </p>
- <p>Available flags for <var class="var">frame_type</var> are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">if</samp>’</dt>
- <dd><p>intra-coded frames (I-frames)
- </p></dd>
- <dt>‘<samp class="samp">pf</samp>’</dt>
- <dd><p>predicted frames (P-frames)
- </p></dd>
- <dt>‘<samp class="samp">bf</samp>’</dt>
- <dd><p>bi-directionally predicted frames (B-frames)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-97"></a>
- <h4 class="subsection">39.27.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-97" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-97" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Visualize forward predicted MVs of all frames using <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -flags2 +export_mvs input.mp4 -vf codecview=mv_type=fp
- </pre></div>
- </li><li>Visualize multi-directionals MVs of P and B-Frames using <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -flags2 +export_mvs input.mp4 -vf codecview=mv=pf+bf+bb
- </pre></div>
- </li></ul>
- <a name="colorbalance"></a>
- <h3 class="section">39.28 colorbalance<span class="pull-right"><a class="anchor hidden-xs" href="#colorbalance" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorbalance" aria-hidden="true">TOC</a></span></h3>
- <p>Modify intensity of primary colors (red, green and blue) of input frames.
- </p>
- <p>The filter allows an input frame to be adjusted in the shadows, midtones or highlights
- regions for the red-cyan, green-magenta or blue-yellow balance.
- </p>
- <p>A positive adjustment value shifts the balance towards the primary color, a negative
- value towards the complementary color.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rs</samp></dt>
- <dt><samp class="option">gs</samp></dt>
- <dt><samp class="option">bs</samp></dt>
- <dd><p>Adjust red, green and blue shadows (darkest pixels).
- </p>
- </dd>
- <dt><samp class="option">rm</samp></dt>
- <dt><samp class="option">gm</samp></dt>
- <dt><samp class="option">bm</samp></dt>
- <dd><p>Adjust red, green and blue midtones (medium pixels).
- </p>
- </dd>
- <dt><samp class="option">rh</samp></dt>
- <dt><samp class="option">gh</samp></dt>
- <dt><samp class="option">bh</samp></dt>
- <dd><p>Adjust red, green and blue highlights (brightest pixels).
- </p>
- <p>Allowed ranges for options are <code class="code">[-1.0, 1.0]</code>. Defaults are <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">pl</samp></dt>
- <dd><p>Preserve lightness when changing color balance. Default is disabled.
- </p></dd>
- </dl>
- <a name="Examples-98"></a>
- <h4 class="subsection">39.28.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-98" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-98" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Add red color cast to shadows:
- <div class="example">
- <pre class="example-preformatted">colorbalance=rs=.3
- </pre></div>
- </li></ul>
- <a name="Commands-66"></a>
- <h4 class="subsection">39.28.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-66" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-66" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="colorcontrast"></a>
- <h3 class="section">39.29 colorcontrast<span class="pull-right"><a class="anchor hidden-xs" href="#colorcontrast" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorcontrast" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust color contrast between RGB components.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rc</samp></dt>
- <dd><p>Set the red-cyan contrast. Defaults is 0.0. Allowed range is from -1.0 to 1.0.
- </p>
- </dd>
- <dt><samp class="option">gm</samp></dt>
- <dd><p>Set the green-magenta contrast. Defaults is 0.0. Allowed range is from -1.0 to 1.0.
- </p>
- </dd>
- <dt><samp class="option">by</samp></dt>
- <dd><p>Set the blue-yellow contrast. Defaults is 0.0. Allowed range is from -1.0 to 1.0.
- </p>
- </dd>
- <dt><samp class="option">rcw</samp></dt>
- <dt><samp class="option">gmw</samp></dt>
- <dt><samp class="option">byw</samp></dt>
- <dd><p>Set the weight of each <code class="code">rc</code>, <code class="code">gm</code>, <code class="code">by</code> option value. Default value is 0.0.
- Allowed range is from 0.0 to 1.0. If all weights are 0.0 filtering is disabled.
- </p>
- </dd>
- <dt><samp class="option">pl</samp></dt>
- <dd><p>Set the amount of preserving lightness. Default value is 0.0. Allowed range is from 0.0 to 1.0.
- </p></dd>
- </dl>
- <a name="Commands-67"></a>
- <h4 class="subsection">39.29.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-67" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-67" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="colorcorrect"></a>
- <h3 class="section">39.30 colorcorrect<span class="pull-right"><a class="anchor hidden-xs" href="#colorcorrect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorcorrect" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust color white balance selectively for blacks and whites.
- This filter operates in YUV colorspace.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rl</samp></dt>
- <dd><p>Set the red shadow spot. Allowed range is from -1.0 to 1.0.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">bl</samp></dt>
- <dd><p>Set the blue shadow spot. Allowed range is from -1.0 to 1.0.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">rh</samp></dt>
- <dd><p>Set the red highlight spot. Allowed range is from -1.0 to 1.0.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">bh</samp></dt>
- <dd><p>Set the blue highlight spot. Allowed range is from -1.0 to 1.0.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set the amount of saturation. Allowed range is from -3.0 to 3.0.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">analyze</samp></dt>
- <dd><p>If set to anything other than <code class="code">manual</code> it will analyze every frame and use derived
- parameters for filtering output frame.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">manual</samp>’</dt>
- <dt>‘<samp class="samp">average</samp>’</dt>
- <dt>‘<samp class="samp">minmax</samp>’</dt>
- <dt>‘<samp class="samp">median</samp>’</dt>
- </dl>
- <p>Default value is <code class="code">manual</code>.
- </p></dd>
- </dl>
- <a name="Commands-68"></a>
- <h4 class="subsection">39.30.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-68" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-68" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="colorchannelmixer"></a>
- <h3 class="section">39.31 colorchannelmixer<span class="pull-right"><a class="anchor hidden-xs" href="#colorchannelmixer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorchannelmixer" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust video input frames by re-mixing color channels.
- </p>
- <p>This filter modifies a color channel by adding the values associated to
- the other channels of the same pixels. For example if the value to
- modify is red, the output value will be:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">red</var>=<var class="var">red</var>*<var class="var">rr</var> + <var class="var">blue</var>*<var class="var">rb</var> + <var class="var">green</var>*<var class="var">rg</var> + <var class="var">alpha</var>*<var class="var">ra</var>
- </pre></div>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rr</samp></dt>
- <dt><samp class="option">rg</samp></dt>
- <dt><samp class="option">rb</samp></dt>
- <dt><samp class="option">ra</samp></dt>
- <dd><p>Adjust contribution of input red, green, blue and alpha channels for output red channel.
- Default is <code class="code">1</code> for <var class="var">rr</var>, and <code class="code">0</code> for <var class="var">rg</var>, <var class="var">rb</var> and <var class="var">ra</var>.
- </p>
- </dd>
- <dt><samp class="option">gr</samp></dt>
- <dt><samp class="option">gg</samp></dt>
- <dt><samp class="option">gb</samp></dt>
- <dt><samp class="option">ga</samp></dt>
- <dd><p>Adjust contribution of input red, green, blue and alpha channels for output green channel.
- Default is <code class="code">1</code> for <var class="var">gg</var>, and <code class="code">0</code> for <var class="var">gr</var>, <var class="var">gb</var> and <var class="var">ga</var>.
- </p>
- </dd>
- <dt><samp class="option">br</samp></dt>
- <dt><samp class="option">bg</samp></dt>
- <dt><samp class="option">bb</samp></dt>
- <dt><samp class="option">ba</samp></dt>
- <dd><p>Adjust contribution of input red, green, blue and alpha channels for output blue channel.
- Default is <code class="code">1</code> for <var class="var">bb</var>, and <code class="code">0</code> for <var class="var">br</var>, <var class="var">bg</var> and <var class="var">ba</var>.
- </p>
- </dd>
- <dt><samp class="option">ar</samp></dt>
- <dt><samp class="option">ag</samp></dt>
- <dt><samp class="option">ab</samp></dt>
- <dt><samp class="option">aa</samp></dt>
- <dd><p>Adjust contribution of input red, green, blue and alpha channels for output alpha channel.
- Default is <code class="code">1</code> for <var class="var">aa</var>, and <code class="code">0</code> for <var class="var">ar</var>, <var class="var">ag</var> and <var class="var">ab</var>.
- </p>
- <p>Allowed ranges for options are <code class="code">[-2.0, 2.0]</code>.
- </p>
- </dd>
- <dt><samp class="option">pc</samp></dt>
- <dd><p>Set preserve color mode. The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disable color preserving, this is default.
- </p></dd>
- <dt>‘<samp class="samp">lum</samp>’</dt>
- <dd><p>Preserve luminance.
- </p></dd>
- <dt>‘<samp class="samp">max</samp>’</dt>
- <dd><p>Preserve max value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">avg</samp>’</dt>
- <dd><p>Preserve average value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">sum</samp>’</dt>
- <dd><p>Preserve sum value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">nrm</samp>’</dt>
- <dd><p>Preserve normalized value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">pwr</samp>’</dt>
- <dd><p>Preserve power value of RGB triplet.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">pa</samp></dt>
- <dd><p>Set the preserve color amount when changing colors. Allowed range is from <code class="code">[0.0, 1.0]</code>.
- Default is <code class="code">0.0</code>, thus disabled.
- </p></dd>
- </dl>
- <a name="Examples-99"></a>
- <h4 class="subsection">39.31.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-99" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-99" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert source to grayscale:
- <div class="example">
- <pre class="example-preformatted">colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3
- </pre></div>
- </li><li>Simulate sepia tones:
- <div class="example">
- <pre class="example-preformatted">colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131
- </pre></div>
- </li></ul>
- <a name="Commands-69"></a>
- <h4 class="subsection">39.31.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-69" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-69" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="colordetect"></a>
- <h3 class="section">39.32 colordetect<span class="pull-right"><a class="anchor hidden-xs" href="#colordetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colordetect" aria-hidden="true">TOC</a></span></h3>
- <p>Analyze the video frames to determine the effective value range and alpha
- mode.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set of properties to detect. Unavailable properties, such as alpha mode for
- an input image without an alpha channel, will be ignored automatically.
- </p>
- <p>Accepts a combination of the following flags:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">color_range</samp>’</dt>
- <dd><p>Detect if the source contains luma pixels outside the limited (MPEG) range,
- which indicates that this is a full range YUV source.
- </p></dd>
- <dt>‘<samp class="samp">alpha_mode</samp>’</dt>
- <dd><p>Detect if the source contains color values above the alpha channel, which
- indicates that the alpha channel is independent (straight), rather than
- premultiplied. Also detects if the alpha plane is fully opaque or not.
- </p></dd>
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>Enable detection of all of the above properties. This is the default.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="colorize"></a>
- <h3 class="section">39.33 colorize<span class="pull-right"><a class="anchor hidden-xs" href="#colorize" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorize" aria-hidden="true">TOC</a></span></h3>
- <p>Overlay a solid color on the video stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">hue</samp></dt>
- <dd><p>Set the color hue. Allowed range is from 0 to 360.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set the color saturation. Allowed range is from 0 to 1.
- Default value is 0.5.
- </p>
- </dd>
- <dt><samp class="option">lightness</samp></dt>
- <dd><p>Set the color lightness. Allowed range is from 0 to 1.
- Default value is 0.5.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>Set the mix of source lightness. By default is set to 1.0.
- Allowed range is from 0.0 to 1.0.
- </p></dd>
- </dl>
- <a name="Commands-70"></a>
- <h4 class="subsection">39.33.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-70" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-70" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="colorkey"></a>
- <h3 class="section">39.34 colorkey<span class="pull-right"><a class="anchor hidden-xs" href="#colorkey" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorkey" aria-hidden="true">TOC</a></span></h3>
- <p>RGB colorspace color keying.
- This filter operates on 8-bit RGB format frames by setting the alpha component of each pixel
- which falls within the similarity radius of the key color to 0. The alpha value for pixels outside
- the similarity radius depends on the value of the blend option.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>Set the color for which alpha will be set to 0 (full transparency).
- See <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- Default is <code class="code">black</code>.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Set the radius from the key color within which other colors also have full transparency.
- The computed distance is related to the unit fractional distance in 3D space between the RGB values
- of the key color and the pixel’s color. Range is 0.01 to 1.0. 0.01 matches within a very small radius
- around the exact key color, while 1.0 matches everything.
- Default is <code class="code">0.01</code>.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Set how the alpha value for pixels that fall outside the similarity radius is computed.
- 0.0 makes pixels either fully transparent or fully opaque.
- Higher values result in semi-transparent pixels, with greater transparency
- the more similar the pixel color is to the key color.
- Range is 0.0 to 1.0. Default is <code class="code">0.0</code>.
- </p></dd>
- </dl>
- <a name="Examples-100"></a>
- <h4 class="subsection">39.34.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-100" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-100" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make every green pixel in the input image transparent:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.png -vf colorkey=green out.png
- </pre></div>
- </li><li>Overlay a greenscreen-video on top of a static background image.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i background.png -i video.mp4 -filter_complex "[1:v]colorkey=0x3BBD1E:0.3:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.flv
- </pre></div>
- </li></ul>
- <a name="Commands-71"></a>
- <h4 class="subsection">39.34.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-71" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-71" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="colorhold"></a>
- <h3 class="section">39.35 colorhold<span class="pull-right"><a class="anchor hidden-xs" href="#colorhold" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorhold" aria-hidden="true">TOC</a></span></h3>
- <p>Remove all color information for all RGB colors except for certain one.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>The color which will not be replaced with neutral gray.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Similarity percentage with the above color.
- 0.01 matches only the exact key color, while 1.0 matches everything.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Blend percentage. 0.0 makes pixels fully gray.
- Higher values result in more preserved color.
- </p></dd>
- </dl>
- <a name="Commands-72"></a>
- <h4 class="subsection">39.35.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-72" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-72" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="colorlevels"></a>
- <h3 class="section">39.36 colorlevels<span class="pull-right"><a class="anchor hidden-xs" href="#colorlevels" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorlevels" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust video input frames using levels.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rimin</samp></dt>
- <dt><samp class="option">gimin</samp></dt>
- <dt><samp class="option">bimin</samp></dt>
- <dt><samp class="option">aimin</samp></dt>
- <dd><p>Adjust red, green, blue and alpha input black point.
- Allowed ranges for options are <code class="code">[-1.0, 1.0]</code>. Defaults are <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">rimax</samp></dt>
- <dt><samp class="option">gimax</samp></dt>
- <dt><samp class="option">bimax</samp></dt>
- <dt><samp class="option">aimax</samp></dt>
- <dd><p>Adjust red, green, blue and alpha input white point.
- Allowed ranges for options are <code class="code">[-1.0, 1.0]</code>. Defaults are <code class="code">1</code>.
- </p>
- <p>Input levels are used to lighten highlights (bright tones), darken shadows
- (dark tones), change the balance of bright and dark tones.
- </p>
- </dd>
- <dt><samp class="option">romin</samp></dt>
- <dt><samp class="option">gomin</samp></dt>
- <dt><samp class="option">bomin</samp></dt>
- <dt><samp class="option">aomin</samp></dt>
- <dd><p>Adjust red, green, blue and alpha output black point.
- Allowed ranges for options are <code class="code">[0, 1.0]</code>. Defaults are <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">romax</samp></dt>
- <dt><samp class="option">gomax</samp></dt>
- <dt><samp class="option">bomax</samp></dt>
- <dt><samp class="option">aomax</samp></dt>
- <dd><p>Adjust red, green, blue and alpha output white point.
- Allowed ranges for options are <code class="code">[0, 1.0]</code>. Defaults are <code class="code">1</code>.
- </p>
- <p>Output levels allows manual selection of a constrained output level range.
- </p>
- </dd>
- <dt><samp class="option">preserve</samp></dt>
- <dd><p>Set preserve color mode. The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disable color preserving, this is default.
- </p></dd>
- <dt>‘<samp class="samp">lum</samp>’</dt>
- <dd><p>Preserve luminance.
- </p></dd>
- <dt>‘<samp class="samp">max</samp>’</dt>
- <dd><p>Preserve max value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">avg</samp>’</dt>
- <dd><p>Preserve average value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">sum</samp>’</dt>
- <dd><p>Preserve sum value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">nrm</samp>’</dt>
- <dd><p>Preserve normalized value of RGB triplet.
- </p></dd>
- <dt>‘<samp class="samp">pwr</samp>’</dt>
- <dd><p>Preserve power value of RGB triplet.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-101"></a>
- <h4 class="subsection">39.36.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-101" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-101" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make video output darker:
- <div class="example">
- <pre class="example-preformatted">colorlevels=rimin=0.058:gimin=0.058:bimin=0.058
- </pre></div>
- </li><li>Increase contrast:
- <div class="example">
- <pre class="example-preformatted">colorlevels=rimin=0.039:gimin=0.039:bimin=0.039:rimax=0.96:gimax=0.96:bimax=0.96
- </pre></div>
- </li><li>Make video output lighter:
- <div class="example">
- <pre class="example-preformatted">colorlevels=rimax=0.902:gimax=0.902:bimax=0.902
- </pre></div>
- </li><li>Increase brightness:
- <div class="example">
- <pre class="example-preformatted">colorlevels=romin=0.5:gomin=0.5:bomin=0.5
- </pre></div>
- </li></ul>
- <a name="Commands-73"></a>
- <h4 class="subsection">39.36.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-73" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-73" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="colormap"></a>
- <h3 class="section">39.37 colormap<span class="pull-right"><a class="anchor hidden-xs" href="#colormap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colormap" aria-hidden="true">TOC</a></span></h3>
- <p>Apply custom color maps to video stream.
- </p>
- <p>This filter needs three input video streams.
- First stream is video stream that is going to be filtered out.
- Second and third video stream specify color patches for source
- color to target color mapping.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">patch_size</samp></dt>
- <dd><p>Set the source and target video stream patch size in pixels.
- </p>
- </dd>
- <dt><samp class="option">nb_patches</samp></dt>
- <dd><p>Set the max number of used patches from source and target video stream.
- Default value is number of patches available in additional video streams.
- Max allowed number of patches is <code class="code">64</code>.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set the adjustments used for target colors. Can be <code class="code">relative</code> or <code class="code">absolute</code>.
- Defaults is <code class="code">absolute</code>.
- </p>
- </dd>
- <dt><samp class="option">kernel</samp></dt>
- <dd><p>Set the kernel used to measure color differences between mapped colors.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">euclidean</samp>’</dt>
- <dt>‘<samp class="samp">weuclidean</samp>’</dt>
- </dl>
- <p>Default is <code class="code">euclidean</code>.
- </p></dd>
- </dl>
- <a name="colormatrix"></a>
- <h3 class="section">39.38 colormatrix<span class="pull-right"><a class="anchor hidden-xs" href="#colormatrix" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colormatrix" aria-hidden="true">TOC</a></span></h3>
- <p>Convert color matrix.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">src</samp></dt>
- <dt><samp class="option">dst</samp></dt>
- <dd><p>Specify the source and destination color matrix. Both values must be
- specified.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">fcc</samp>’</dt>
- <dd><p>FCC
- </p>
- </dd>
- <dt>‘<samp class="samp">bt601</samp>’</dt>
- <dd><p>BT.601
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470</samp>’</dt>
- <dd><p>BT.470
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>BT.2020
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>For example to convert from BT.601 to SMPTE-240M, use the command:
- </p><div class="example">
- <pre class="example-preformatted">colormatrix=bt601:smpte240m
- </pre></div>
- <a name="colorspace"></a>
- <h3 class="section">39.39 colorspace<span class="pull-right"><a class="anchor hidden-xs" href="#colorspace" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorspace" aria-hidden="true">TOC</a></span></h3>
- <p>Convert colorspace, transfer characteristics or color primaries.
- Input video needs to have an even size.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dd><a class="anchor" id="all"></a></dd>
- <dt><samp class="option">all</samp></dt>
- <dd><p>Specify all color properties at once.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dd><p>BT.470M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG
- </p>
- </dd>
- <dt>‘<samp class="samp">bt601-6-525</samp>’</dt>
- <dd><p>BT.601-6 525
- </p>
- </dd>
- <dt>‘<samp class="samp">bt601-6-625</samp>’</dt>
- <dd><p>BT.601-6 625
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>BT.2020
- </p>
- </dd>
- </dl>
- <a class="anchor" id="space"></a></dd>
- <dt><samp class="option">space</samp></dt>
- <dd><p>Specify output colorspace.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">fcc</samp>’</dt>
- <dd><p>FCC
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG or BT.601-6 625
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M or BT.601-6 525
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">ycgco</samp>’</dt>
- <dd><p>YCgCo
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020ncl</samp>’</dt>
- <dd><p>BT.2020 with non-constant luminance
- </p>
- </dd>
- </dl>
- <a class="anchor" id="trc"></a></dd>
- <dt><samp class="option">trc</samp></dt>
- <dd><p>Specify output transfer characteristics.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dd><p>BT.470M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG
- </p>
- </dd>
- <dt>‘<samp class="samp">gamma22</samp>’</dt>
- <dd><p>Constant gamma of 2.2
- </p>
- </dd>
- <dt>‘<samp class="samp">gamma28</samp>’</dt>
- <dd><p>Constant gamma of 2.8
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M, BT.601-6 625 or BT.601-6 525
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">srgb</samp>’</dt>
- <dd><p>SRGB
- </p>
- </dd>
- <dt>‘<samp class="samp">iec61966-2-1</samp>’</dt>
- <dd><p>iec61966-2-1
- </p>
- </dd>
- <dt>‘<samp class="samp">iec61966-2-4</samp>’</dt>
- <dd><p>iec61966-2-4
- </p>
- </dd>
- <dt>‘<samp class="samp">xvycc</samp>’</dt>
- <dd><p>xvycc
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020-10</samp>’</dt>
- <dd><p>BT.2020 for 10-bits content
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020-12</samp>’</dt>
- <dd><p>BT.2020 for 12-bits content
- </p>
- </dd>
- </dl>
- <a class="anchor" id="primaries"></a></dd>
- <dt><samp class="option">primaries</samp></dt>
- <dd><p>Specify output color primaries.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dd><p>BT.470M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG or BT.601-6 625
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M or BT.601-6 525
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dd><p>film
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte431</samp>’</dt>
- <dd><p>SMPTE-431
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte432</samp>’</dt>
- <dd><p>SMPTE-432
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>BT.2020
- </p>
- </dd>
- <dt>‘<samp class="samp">jedec-p22</samp>’</dt>
- <dd><p>JEDEC P22 phosphors
- </p>
- </dd>
- </dl>
- <a class="anchor" id="range"></a></dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Specify output color range.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">tv</samp>’</dt>
- <dd><p>TV (restricted) range
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg</samp>’</dt>
- <dd><p>MPEG (restricted) range
- </p>
- </dd>
- <dt>‘<samp class="samp">pc</samp>’</dt>
- <dd><p>PC (full) range
- </p>
- </dd>
- <dt>‘<samp class="samp">jpeg</samp>’</dt>
- <dd><p>JPEG (full) range
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Specify output color format.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">yuv420p</samp>’</dt>
- <dd><p>YUV 4:2:0 planar 8-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv420p10</samp>’</dt>
- <dd><p>YUV 4:2:0 planar 10-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv420p12</samp>’</dt>
- <dd><p>YUV 4:2:0 planar 12-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv422p</samp>’</dt>
- <dd><p>YUV 4:2:2 planar 8-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv422p10</samp>’</dt>
- <dd><p>YUV 4:2:2 planar 10-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv422p12</samp>’</dt>
- <dd><p>YUV 4:2:2 planar 12-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv444p</samp>’</dt>
- <dd><p>YUV 4:4:4 planar 8-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv444p10</samp>’</dt>
- <dd><p>YUV 4:4:4 planar 10-bits
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv444p12</samp>’</dt>
- <dd><p>YUV 4:4:4 planar 12-bits
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">fast</samp></dt>
- <dd><p>Do a fast conversion, which skips gamma/primary correction. This will take
- significantly less CPU, but will be mathematically incorrect. To get output
- compatible with that produced by the colormatrix filter, use fast=1.
- </p>
- </dd>
- <dt><samp class="option">dither</samp></dt>
- <dd><p>Specify dithering mode.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No dithering
- </p>
- </dd>
- <dt>‘<samp class="samp">fsb</samp>’</dt>
- <dd><p>Floyd-Steinberg dithering
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">wpadapt</samp></dt>
- <dd><p>Whitepoint adaptation mode.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bradford</samp>’</dt>
- <dd><p>Bradford whitepoint adaptation
- </p>
- </dd>
- <dt>‘<samp class="samp">vonkries</samp>’</dt>
- <dd><p>von Kries whitepoint adaptation
- </p>
- </dd>
- <dt>‘<samp class="samp">identity</samp>’</dt>
- <dd><p>identity whitepoint adaptation (i.e. no whitepoint adaptation)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">clipgamut</samp></dt>
- <dd><p>Controls how to clip out-of-gamut colors that arise as a result of colorspace conversion.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No clipping of out of gamut colors.
- </p>
- </dd>
- <dt>‘<samp class="samp">rgb</samp>’</dt>
- <dd><p>Clips the RGB values to the [0, 1] range when building the gamma transfer LUTs.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">iall</samp></dt>
- <dd><p>Override all input properties at once. Same accepted values as <a class="ref" href="#all">all</a>.
- </p>
- </dd>
- <dt><samp class="option">ispace</samp></dt>
- <dd><p>Override input colorspace. Same accepted values as <a class="ref" href="#space">space</a>.
- </p>
- </dd>
- <dt><samp class="option">iprimaries</samp></dt>
- <dd><p>Override input color primaries. Same accepted values as <a class="ref" href="#primaries">primaries</a>.
- </p>
- </dd>
- <dt><samp class="option">itrc</samp></dt>
- <dd><p>Override input transfer characteristics. Same accepted values as <a class="ref" href="#trc">trc</a>.
- </p>
- </dd>
- <dt><samp class="option">irange</samp></dt>
- <dd><p>Override input color range. Same accepted values as <a class="ref" href="#range">range</a>.
- </p>
- </dd>
- </dl>
- <p>The filter converts the transfer characteristics, color space and color
- primaries to the specified user values. The output value, if not specified,
- is set to a default value based on the "all" property. If that property is
- also not specified, the filter will log an error. The output color range and
- format default to the same value as the input color range and format. The
- input transfer characteristics, color space, color primaries and color range
- should be set on the input data. If any of these are missing, the filter will
- log an error and no conversion will take place.
- </p>
- <p>For example to convert the input to SMPTE-240M, use the command:
- </p><div class="example">
- <pre class="example-preformatted">colorspace=smpte240m
- </pre></div>
- <a name="colortemperature"></a>
- <h3 class="section">39.40 colortemperature<span class="pull-right"><a class="anchor hidden-xs" href="#colortemperature" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colortemperature" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust color temperature in video to simulate variations in ambient color temperature.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">temperature</samp></dt>
- <dd><p>Set the temperature in Kelvin. Allowed range is from 1000 to 40000.
- Default value is 6500 K.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>Set mixing with filtered output. Allowed range is from 0 to 1.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">pl</samp></dt>
- <dd><p>Set the amount of preserving lightness. Allowed range is from 0 to 1.
- Default value is 0.
- </p></dd>
- </dl>
- <a name="Commands-74"></a>
- <h4 class="subsection">39.40.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-74" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-74" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="convolution"></a>
- <h3 class="section">39.41 convolution<span class="pull-right"><a class="anchor hidden-xs" href="#convolution" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-convolution" aria-hidden="true">TOC</a></span></h3>
- <p>Apply convolution of 3x3, 5x5, 7x7 or horizontal/vertical up to 49 elements.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">0m</samp></dt>
- <dt><samp class="option">1m</samp></dt>
- <dt><samp class="option">2m</samp></dt>
- <dt><samp class="option">3m</samp></dt>
- <dd><p>Set matrix for each plane.
- Matrix is sequence of 9, 25 or 49 signed integers in <var class="var">square</var> mode,
- and from 1 to 49 odd number of signed integers in <var class="var">row</var> mode.
- </p>
- </dd>
- <dt><samp class="option">0rdiv</samp></dt>
- <dt><samp class="option">1rdiv</samp></dt>
- <dt><samp class="option">2rdiv</samp></dt>
- <dt><samp class="option">3rdiv</samp></dt>
- <dd><p>Set multiplier for calculated value for each plane.
- If unset or 0, it will be 1/sum of all matrix elements.
- </p>
- </dd>
- <dt><samp class="option">0bias</samp></dt>
- <dt><samp class="option">1bias</samp></dt>
- <dt><samp class="option">2bias</samp></dt>
- <dt><samp class="option">3bias</samp></dt>
- <dd><p>Set bias for each plane. This value is added to the result of the multiplication.
- Useful for making the overall image brighter or darker. Default is 0.0.
- </p>
- </dd>
- <dt><samp class="option">0mode</samp></dt>
- <dt><samp class="option">1mode</samp></dt>
- <dt><samp class="option">2mode</samp></dt>
- <dt><samp class="option">3mode</samp></dt>
- <dd><p>Set matrix mode for each plane. Can be <var class="var">square</var>, <var class="var">row</var> or <var class="var">column</var>.
- Default is <var class="var">square</var>.
- </p></dd>
- </dl>
- <a name="Commands-75"></a>
- <h4 class="subsection">39.41.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-75" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-75" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-102"></a>
- <h4 class="subsection">39.41.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-102" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-102" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply sharpen:
- <div class="example">
- <pre class="example-preformatted">convolution="0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0"
- </pre></div>
- </li><li>Apply blur:
- <div class="example">
- <pre class="example-preformatted">convolution="1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9"
- </pre></div>
- </li><li>Apply edge enhance:
- <div class="example">
- <pre class="example-preformatted">convolution="0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128"
- </pre></div>
- </li><li>Apply edge detect:
- <div class="example">
- <pre class="example-preformatted">convolution="0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128"
- </pre></div>
- </li><li>Apply laplacian edge detector which includes diagonals:
- <div class="example">
- <pre class="example-preformatted">convolution="1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0"
- </pre></div>
- </li><li>Apply emboss:
- <div class="example">
- <pre class="example-preformatted">convolution="-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2"
- </pre></div>
- </li></ul>
- <a name="convolve"></a>
- <h3 class="section">39.42 convolve<span class="pull-right"><a class="anchor hidden-xs" href="#convolve" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-convolve" aria-hidden="true">TOC</a></span></h3>
- <p>Apply 2D convolution of video stream in frequency domain using second stream
- as impulse.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process.
- </p>
- </dd>
- <dt><samp class="option">impulse</samp></dt>
- <dd><p>Set which impulse video frames will be processed, can be <var class="var">first</var>
- or <var class="var">all</var>. Default is <var class="var">all</var>.
- </p></dd>
- </dl>
- <p>The <code class="code">convolve</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="copy"></a>
- <h3 class="section">39.43 copy<span class="pull-right"><a class="anchor hidden-xs" href="#copy" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-copy" aria-hidden="true">TOC</a></span></h3>
- <p>Copy the input video source unchanged to the output. This is mainly useful for
- testing purposes.
- </p>
- <a class="anchor" id="coreimage"></a><a name="coreimage-1"></a>
- <h3 class="section">39.44 coreimage<span class="pull-right"><a class="anchor hidden-xs" href="#coreimage-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-coreimage-1" aria-hidden="true">TOC</a></span></h3>
- <p>Video filtering on GPU using Apple’s CoreImage API on OSX.
- </p>
- <p>Hardware acceleration is based on an OpenGL context. Usually, this means it is
- processed by video hardware. However, software-based OpenGL implementations
- exist which means there is no guarantee for hardware processing. It depends on
- the respective OSX.
- </p>
- <p>There are many filters and image generators provided by Apple that come with a
- large variety of options. The filter has to be referenced by its name along
- with its options.
- </p>
- <p>The coreimage filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">list_filters</samp></dt>
- <dd><p>List all available filters and generators along with all their respective
- options as well as possible minimum and maximum values along with the default
- values.
- </p><div class="example">
- <pre class="example-preformatted">list_filters=true
- </pre></div>
- </dd>
- <dt><samp class="option">filter</samp></dt>
- <dd><p>Specify all filters by their respective name and options.
- Use <var class="var">list_filters</var> to determine all valid filter names and options.
- Numerical options are specified by a float value and are automatically clamped
- to their respective value range. Vector and color options have to be specified
- by a list of space separated float values. Character escaping has to be done.
- A special option name <code class="code">default</code> is available to use default options for a
- filter.
- </p>
- <p>It is required to specify either <code class="code">default</code> or at least one of the filter options.
- All omitted options are used with their default values.
- The syntax of the filter string is as follows:
- </p><div class="example">
- <pre class="example-preformatted">filter=<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...][#<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...]][#...]
- </pre></div>
- </dd>
- <dt><samp class="option">output_rect</samp></dt>
- <dd><p>Specify a rectangle where the output of the filter chain is copied into the
- input image. It is given by a list of space separated float values:
- </p><div class="example">
- <pre class="example-preformatted">output_rect=x\ y\ width\ height
- </pre></div>
- <p>If not given, the output rectangle equals the dimensions of the input image.
- The output rectangle is automatically cropped at the borders of the input
- image. Negative values are valid for each component.
- </p><div class="example">
- <pre class="example-preformatted">output_rect=25\ 25\ 100\ 100
- </pre></div>
- </dd>
- </dl>
- <p>Several filters can be chained for successive processing without GPU-HOST
- transfers allowing for fast processing of complex filter chains.
- Currently, only filters with zero (generators) or exactly one (filters) input
- image and one output image are supported. Also, transition filters are not yet
- usable as intended.
- </p>
- <p>Some filters generate output images with additional padding depending on the
- respective filter kernel. The padding is automatically removed to ensure the
- filter output has the same size as the input image.
- </p>
- <p>For image generators, the size of the output image is determined by the
- previous output image of the filter chain or the input image of the whole
- filterchain, respectively. The generators do not use the pixel information of
- this image to generate their output. However, the generated output is
- blended onto this image, resulting in partial or complete coverage of the
- output image.
- </p>
- <p>The <a class="ref" href="#coreimagesrc">coreimagesrc</a> video source can be used for generating input images
- which are directly fed into the filter chain. By using it, providing input
- images by another video source or an input video is not required.
- </p>
- <a name="Examples-103"></a>
- <h4 class="subsection">39.44.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-103" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-103" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>List all filters available:
- <div class="example">
- <pre class="example-preformatted">coreimage=list_filters=true
- </pre></div>
- </li><li>Use the CIBoxBlur filter with default options to blur an image:
- <div class="example">
- <pre class="example-preformatted">coreimage=filter=CIBoxBlur@default
- </pre></div>
- </li><li>Use a filter chain with CISepiaTone at default values and CIVignetteEffect with
- its center at 100x100 and a radius of 50 pixels:
- <div class="example">
- <pre class="example-preformatted">coreimage=filter=CIBoxBlur@default#CIVignetteEffect@inputCenter=100\ 100@inputRadius=50
- </pre></div>
- </li><li>Use nullsrc and CIQRCodeGenerator to create a QR code for the FFmpeg homepage,
- given as complete and escaped command-line for Apple’s standard bash shell:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i nullsrc=s=100x100,coreimage=filter=CIQRCodeGenerator@inputMessage=https\\\\\://FFmpeg.org/@inputCorrectionLevel=H -frames:v 1 QRCode.png
- </pre></div>
- </li></ul>
- <a name="corr"></a>
- <h3 class="section">39.45 corr<span class="pull-right"><a class="anchor hidden-xs" href="#corr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-corr" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the correlation between two input videos.
- </p>
- <p>This filter takes two input videos.
- </p>
- <p>Both input videos must have the same resolution and pixel format for
- this filter to work correctly. Also it assumes that both inputs
- have the same number of frames, which are compared one by one.
- </p>
- <p>The obtained per component, average, min and max correlation is printed through
- the logging system.
- </p>
- <p>The filter stores the calculated correlation of each frame in frame metadata.
- </p>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>In the below example the input file <samp class="file">main.mpg</samp> being processed is compared
- with the reference file <samp class="file">ref.mpg</samp>.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mpg -lavfi corr -f null -
- </pre></div>
- <a name="cover_005frect"></a>
- <h3 class="section">39.46 cover_rect<span class="pull-right"><a class="anchor hidden-xs" href="#cover_005frect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-cover_005frect" aria-hidden="true">TOC</a></span></h3>
- <p>Cover a rectangular object
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">cover</samp></dt>
- <dd><p>Filepath of the optional cover image, needs to be in yuv420.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set covering mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">cover</samp>’</dt>
- <dd><p>cover it by the supplied image
- </p></dd>
- <dt>‘<samp class="samp">blur</samp>’</dt>
- <dd><p>cover it by interpolating the surrounding pixels
- </p></dd>
- </dl>
- <p>Default value is <var class="var">blur</var>.
- </p></dd>
- </dl>
- <a name="Examples-104"></a>
- <h4 class="subsection">39.46.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-104" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-104" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Cover a rectangular object by the supplied image of a given video using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv
- </pre></div>
- </li></ul>
- <a name="crop"></a>
- <h3 class="section">39.47 crop<span class="pull-right"><a class="anchor hidden-xs" href="#crop" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-crop" aria-hidden="true">TOC</a></span></h3>
- <p>Crop the input video to given dimensions.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">w, out_w</samp></dt>
- <dd><p>The width of the output video. It defaults to <code class="code">iw</code>.
- This expression is evaluated only once during the filter
- configuration, or when the ‘<samp class="samp">w</samp>’ or ‘<samp class="samp">out_w</samp>’ command is sent.
- </p>
- </dd>
- <dt><samp class="option">h, out_h</samp></dt>
- <dd><p>The height of the output video. It defaults to <code class="code">ih</code>.
- This expression is evaluated only once during the filter
- configuration, or when the ‘<samp class="samp">h</samp>’ or ‘<samp class="samp">out_h</samp>’ command is sent.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dd><p>The horizontal position, in the input video, of the left edge of the output
- video. It defaults to <code class="code">(in_w-out_w)/2</code>.
- This expression is evaluated per-frame.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The vertical position, in the input video, of the top edge of the output video.
- It defaults to <code class="code">(in_h-out_h)/2</code>.
- This expression is evaluated per-frame.
- </p>
- </dd>
- <dt><samp class="option">keep_aspect</samp></dt>
- <dd><p>If set to 1 will force the output display aspect ratio
- to be the same of the input, by changing the output sample aspect
- ratio. It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">exact</samp></dt>
- <dd><p>Enable exact cropping. If enabled, subsampled videos will be cropped at exact
- width/height/x/y as specified and will not be rounded to nearest smaller value.
- It defaults to 0.
- </p></dd>
- </dl>
- <p>The <var class="var">out_w</var>, <var class="var">out_h</var>, <var class="var">x</var>, <var class="var">y</var> parameters are
- expressions containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The computed values for <var class="var">x</var> and <var class="var">y</var>. They are evaluated for
- each new frame.
- </p>
- </dd>
- <dt><samp class="option">in_w</samp></dt>
- <dt><samp class="option">in_h</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">iw</samp></dt>
- <dt><samp class="option">ih</samp></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><samp class="option">out_w</samp></dt>
- <dt><samp class="option">out_h</samp></dt>
- <dd><p>The output (cropped) width and height.
- </p>
- </dd>
- <dt><samp class="option">ow</samp></dt>
- <dt><samp class="option">oh</samp></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">iw</var> / <var class="var">ih</var>) * <var class="var">sar</var>
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>The number of the input frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>the position in the file of the input frame, NAN if unknown; deprecated,
- do not use
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The timestamp expressed in seconds. It’s NAN if the input timestamp is unknown.
- </p>
- </dd>
- </dl>
- <p>The expression for <var class="var">out_w</var> may depend on the value of <var class="var">out_h</var>,
- and the expression for <var class="var">out_h</var> may depend on <var class="var">out_w</var>, but they
- cannot depend on <var class="var">x</var> and <var class="var">y</var>, as <var class="var">x</var> and <var class="var">y</var> are
- evaluated after <var class="var">out_w</var> and <var class="var">out_h</var>.
- </p>
- <p>The <var class="var">x</var> and <var class="var">y</var> parameters specify the expressions for the
- position of the top-left corner of the output (non-cropped) area. They
- are evaluated for each frame. If the evaluated value is not valid, it
- is approximated to the nearest valid value.
- </p>
- <p>The expression for <var class="var">x</var> may depend on <var class="var">y</var>, and the expression
- for <var class="var">y</var> may depend on <var class="var">x</var>.
- </p>
- <a name="Examples-105"></a>
- <h4 class="subsection">39.47.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-105" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-105" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Crop area with size 100x100 at position (12,34).
- <div class="example">
- <pre class="example-preformatted">crop=100:100:12:34
- </pre></div>
- <p>Using named options, the example above becomes:
- </p><div class="example">
- <pre class="example-preformatted">crop=w=100:h=100:x=12:y=34
- </pre></div>
- </li><li>Crop the central input area with size 100x100:
- <div class="example">
- <pre class="example-preformatted">crop=100:100
- </pre></div>
- </li><li>Crop the central input area with size 2/3 of the input video:
- <div class="example">
- <pre class="example-preformatted">crop=2/3*in_w:2/3*in_h
- </pre></div>
- </li><li>Crop the input video central square:
- <div class="example">
- <pre class="example-preformatted">crop=out_w=in_h
- crop=in_h
- </pre></div>
- </li><li>Delimit the rectangle with the top-left corner placed at position
- 100:100 and the right-bottom corner corresponding to the right-bottom
- corner of the input image.
- <div class="example">
- <pre class="example-preformatted">crop=in_w-100:in_h-100:100:100
- </pre></div>
- </li><li>Crop 10 pixels from the left and right borders, and 20 pixels from
- the top and bottom borders
- <div class="example">
- <pre class="example-preformatted">crop=in_w-2*10:in_h-2*20
- </pre></div>
- </li><li>Keep only the bottom right quarter of the input image:
- <div class="example">
- <pre class="example-preformatted">crop=in_w/2:in_h/2:in_w/2:in_h/2
- </pre></div>
- </li><li>Crop height for getting Greek harmony:
- <div class="example">
- <pre class="example-preformatted">crop=in_w:1/PHI*in_w
- </pre></div>
- </li><li>Apply trembling effect:
- <div class="example">
- <pre class="example-preformatted">crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)
- </pre></div>
- </li><li>Apply erratic camera effect depending on timestamp:
- <div class="example">
- <pre class="example-preformatted">crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)
- </pre></div>
- </li><li>Set x depending on the value of y:
- <div class="example">
- <pre class="example-preformatted">crop=in_w/2:in_h/2:y:10+10*sin(n/10)
- </pre></div>
- </li></ul>
- <a name="Commands-76"></a>
- <h4 class="subsection">39.47.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-76" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-76" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">w, out_w</samp></dt>
- <dt><samp class="option">h, out_h</samp></dt>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set width/height of the output video and the horizontal/vertical position
- in the input video.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="cropdetect"></a>
- <h3 class="section">39.48 cropdetect<span class="pull-right"><a class="anchor hidden-xs" href="#cropdetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-cropdetect" aria-hidden="true">TOC</a></span></h3>
- <p>Auto-detect the crop size.
- </p>
- <p>It calculates the necessary cropping parameters and prints the
- recommended parameters via the logging system. The detected dimensions
- correspond to the non-black or video area of the input video according to <var class="var">mode</var>.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Depending on <var class="var">mode</var> crop detection is based on either the mere black value of surrounding pixels or a combination of motion vectors and edge pixels.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">black</samp>’</dt>
- <dd><p>Detect black pixels surrounding the playing video. For fine control use option <var class="var">limit</var>.
- </p>
- </dd>
- <dt>‘<samp class="samp">mvedges</samp>’</dt>
- <dd><p>Detect the playing video by the motion vectors inside the video and scanning for edge pixels typically forming the border of a playing video.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">limit</samp></dt>
- <dd><p>Set higher black value threshold, which can be optionally specified
- from nothing (0) to everything (255 for 8-bit based formats). An intensity
- value greater to the set value is considered non-black. It defaults to 24.
- You can also specify a value between 0.0 and 1.0 which will be scaled depending
- on the bitdepth of the pixel format.
- </p>
- </dd>
- <dt><samp class="option">round</samp></dt>
- <dd><p>The value which the width/height should be divisible by. It defaults to
- 16. The offset is automatically adjusted to center the video. Use 2 to
- get only even dimensions (needed for 4:2:2 video). 16 is best when
- encoding to most video codecs.
- </p>
- </dd>
- <dt><samp class="option">skip</samp></dt>
- <dd><p>Set the number of initial frames for which evaluation is skipped.
- Default is 2. Range is 0 to INT_MAX.
- </p>
- </dd>
- <dt><samp class="option">reset_count, reset</samp></dt>
- <dd><p>Set the counter that determines after how many frames cropdetect will
- reset the previously detected largest video area and start over to
- detect the current optimal crop area. Default value is 0.
- </p>
- <p>This can be useful when channel logos distort the video area. 0
- indicates ’never reset’, and returns the largest area encountered during
- playback.
- </p>
- </dd>
- <dt><samp class="option">mv_threshold</samp></dt>
- <dd><p>Set motion in pixel units as threshold for motion detection. It defaults to 8.
- </p>
- </dd>
- <dt><samp class="option">low</samp></dt>
- <dt><samp class="option">high</samp></dt>
- <dd><p>Set low and high threshold values used by the Canny thresholding
- algorithm.
- </p>
- <p>The high threshold selects the "strong" edge pixels, which are then
- connected through 8-connectivity with the "weak" edge pixels selected
- by the low threshold.
- </p>
- <p><var class="var">low</var> and <var class="var">high</var> threshold values must be chosen in the range
- [0,1], and <var class="var">low</var> should be lesser or equal to <var class="var">high</var>.
- </p>
- <p>Default value for <var class="var">low</var> is <code class="code">5/255</code>, and default value for <var class="var">high</var>
- is <code class="code">15/255</code>.
- </p></dd>
- </dl>
- <a name="Examples-106"></a>
- <h4 class="subsection">39.48.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-106" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-106" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Find video area surrounded by black borders:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i file.mp4 -vf cropdetect,metadata=mode=print -f null -
- </pre></div>
- </li><li>Find an embedded video area, generate motion vectors beforehand:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i file.mp4 -vf mestimate,cropdetect=mode=mvedges,metadata=mode=print -f null -
- </pre></div>
- </li><li>Find an embedded video area, use motion vectors from decoder:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -flags2 +export_mvs -i file.mp4 -vf cropdetect=mode=mvedges,metadata=mode=print -f null -
- </pre></div>
- </li></ul>
- <a name="Commands-77"></a>
- <h4 class="subsection">39.48.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-77" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-77" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p>
- <dl class="table">
- <dt><samp class="option">limit</samp></dt>
- <dd><p>The command accepts the same syntax of the corresponding option.
- If the specified expression is not valid, it is kept at its current value.
- </p></dd>
- </dl>
- <a class="anchor" id="cue"></a><a name="cue-1"></a>
- <h3 class="section">39.49 cue<span class="pull-right"><a class="anchor hidden-xs" href="#cue-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-cue-1" aria-hidden="true">TOC</a></span></h3>
- <p>Delay video filtering until a given wallclock timestamp. The filter first
- passes on <samp class="option">preroll</samp> amount of frames, then it buffers at most
- <samp class="option">buffer</samp> amount of frames and waits for the cue. After reaching the cue
- it forwards the buffered frames and also any subsequent frames coming in its
- input.
- </p>
- <p>The filter can be used synchronize the output of multiple ffmpeg processes for
- realtime output devices like decklink. By putting the delay in the filtering
- chain and pre-buffering frames the process can pass on data to output almost
- immediately after the target wallclock timestamp is reached.
- </p>
- <p>Perfect frame accuracy cannot be guaranteed, but the result is good enough for
- some use cases.
- </p>
- <dl class="table">
- <dt><samp class="option">cue</samp></dt>
- <dd><p>The cue timestamp expressed in a UNIX timestamp in microseconds. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">preroll</samp></dt>
- <dd><p>The duration of content to pass on as preroll expressed in seconds. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">buffer</samp></dt>
- <dd><p>The maximum duration of content to buffer before waiting for the cue expressed
- in seconds. Default is 0.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="curves"></a><a name="curves-1"></a>
- <h3 class="section">39.50 curves<span class="pull-right"><a class="anchor hidden-xs" href="#curves-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-curves-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply color adjustments using curves.
- </p>
- <p>This filter is similar to the Adobe Photoshop and GIMP curves tools. Each
- component (red, green and blue) has its values defined by <var class="var">N</var> key points
- tied from each other using a smooth curve. The x-axis represents the pixel
- values from the input frame, and the y-axis the new pixel values to be set for
- the output frame.
- </p>
- <p>By default, a component curve is defined by the two points <var class="var">(0;0)</var> and
- <var class="var">(1;1)</var>. This creates a straight line where each original pixel value is
- "adjusted" to its own value, which means no change to the image.
- </p>
- <p>The filter allows you to redefine these two points and add some more. A new
- curve will be defined to pass smoothly through all these new coordinates. The
- new defined points need to be strictly increasing over the x-axis, and their
- <var class="var">x</var> and <var class="var">y</var> values must be in the <var class="var">[0;1]</var> interval. The curve is
- formed by using a natural or monotonic cubic spline interpolation, depending
- on the <var class="var">interp</var> option (default: <code class="code">natural</code>). The <code class="code">natural</code>
- spline produces a smoother curve in general while the monotonic (<code class="code">pchip</code>)
- spline guarantees the transitions between the specified points to be
- monotonic. If the computed curves happened to go outside the vector spaces,
- the values will be clipped accordingly.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">preset</samp></dt>
- <dd><p>Select one of the available color presets. This option can be used in addition
- to the <samp class="option">r</samp>, <samp class="option">g</samp>, <samp class="option">b</samp> parameters; in this case, the later
- options takes priority on the preset values.
- Available presets are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dt>‘<samp class="samp">color_negative</samp>’</dt>
- <dt>‘<samp class="samp">cross_process</samp>’</dt>
- <dt>‘<samp class="samp">darker</samp>’</dt>
- <dt>‘<samp class="samp">increase_contrast</samp>’</dt>
- <dt>‘<samp class="samp">lighter</samp>’</dt>
- <dt>‘<samp class="samp">linear_contrast</samp>’</dt>
- <dt>‘<samp class="samp">medium_contrast</samp>’</dt>
- <dt>‘<samp class="samp">negative</samp>’</dt>
- <dt>‘<samp class="samp">strong_contrast</samp>’</dt>
- <dt>‘<samp class="samp">vintage</samp>’</dt>
- </dl>
- <p>Default is <code class="code">none</code>.
- </p></dd>
- <dt><samp class="option">master, m</samp></dt>
- <dd><p>Set the master key points. These points will define a second pass mapping. It
- is sometimes called a "luminance" or "value" mapping. It can be used with
- <samp class="option">r</samp>, <samp class="option">g</samp>, <samp class="option">b</samp> or <samp class="option">all</samp> since it acts like a
- post-processing LUT.
- </p></dd>
- <dt><samp class="option">red, r</samp></dt>
- <dd><p>Set the key points for the red component.
- </p></dd>
- <dt><samp class="option">green, g</samp></dt>
- <dd><p>Set the key points for the green component.
- </p></dd>
- <dt><samp class="option">blue, b</samp></dt>
- <dd><p>Set the key points for the blue component.
- </p></dd>
- <dt><samp class="option">all</samp></dt>
- <dd><p>Set the key points for all components (not including master).
- Can be used in addition to the other key points component
- options. In this case, the unset component(s) will fallback on this
- <samp class="option">all</samp> setting.
- </p></dd>
- <dt><samp class="option">psfile</samp></dt>
- <dd><p>Specify a Photoshop curves file (<code class="code">.acv</code>) to import the settings from.
- </p></dd>
- <dt><samp class="option">plot</samp></dt>
- <dd><p>Save Gnuplot script of the curves in specified file.
- </p></dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Specify the kind of interpolation. Available algorithms are:
- </p><dl class="table">
- <dt>‘<samp class="samp">natural</samp>’</dt>
- <dd><p>Natural cubic spline using a piece-wise cubic polynomial that is twice continuously differentiable.
- </p></dd>
- <dt>‘<samp class="samp">pchip</samp>’</dt>
- <dd><p>Monotonic cubic spline using a piecewise cubic Hermite interpolating polynomial (PCHIP).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>To avoid some filtergraph syntax conflicts, each key points list need to be
- defined using the following syntax: <code class="code">x0/y0 x1/y1 x2/y2 ...</code>.
- </p>
- <a name="Commands-78"></a>
- <h4 class="subsection">39.50.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-78" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-78" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="Examples-107"></a>
- <h4 class="subsection">39.50.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-107" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-107" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Increase slightly the middle level of blue:
- <div class="example">
- <pre class="example-preformatted">curves=blue='0/0 0.5/0.58 1/1'
- </pre></div>
- </li><li>Vintage effect:
- <div class="example">
- <pre class="example-preformatted">curves=r='0/0.11 .42/.51 1/0.95':g='0/0 0.50/0.48 1/1':b='0/0.22 .49/.44 1/0.8'
- </pre></div>
- <p>Here we obtain the following coordinates for each components:
- </p><dl class="table">
- <dt><var class="var">red</var></dt>
- <dd><p><code class="code">(0;0.11) (0.42;0.51) (1;0.95)</code>
- </p></dd>
- <dt><var class="var">green</var></dt>
- <dd><p><code class="code">(0;0) (0.50;0.48) (1;1)</code>
- </p></dd>
- <dt><var class="var">blue</var></dt>
- <dd><p><code class="code">(0;0.22) (0.49;0.44) (1;0.80)</code>
- </p></dd>
- </dl>
- </li><li>The previous example can also be achieved with the associated built-in preset:
- <div class="example">
- <pre class="example-preformatted">curves=preset=vintage
- </pre></div>
- </li><li>Or simply:
- <div class="example">
- <pre class="example-preformatted">curves=vintage
- </pre></div>
- </li><li>Use a Photoshop preset and redefine the points of the green component:
- <div class="example">
- <pre class="example-preformatted">curves=psfile='MyCurvesPresets/purple.acv':green='0/0 0.45/0.53 1/1'
- </pre></div>
- </li><li>Check out the curves of the <code class="code">cross_process</code> profile using <code class="command">ffmpeg</code>
- and <code class="command">gnuplot</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i color -vf curves=cross_process:plot=/tmp/curves.plt -frames:v 1 -f null -
- gnuplot -p /tmp/curves.plt
- </pre></div>
- </li></ul>
- <a name="datascope"></a>
- <h3 class="section">39.51 datascope<span class="pull-right"><a class="anchor hidden-xs" href="#datascope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-datascope" aria-hidden="true">TOC</a></span></h3>
- <p>Video data analysis filter.
- </p>
- <p>This filter shows hexadecimal pixel values of part of video.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set output video size.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set x offset from where to pick pixels.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set y offset from where to pick pixels.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set scope mode, can be one of the following:
- </p><dl class="table">
- <dt>‘<samp class="samp">mono</samp>’</dt>
- <dd><p>Draw hexadecimal pixel values with white color on black background.
- </p>
- </dd>
- <dt>‘<samp class="samp">color</samp>’</dt>
- <dd><p>Draw hexadecimal pixel values with input video pixel color on black
- background.
- </p>
- </dd>
- <dt>‘<samp class="samp">color2</samp>’</dt>
- <dd><p>Draw hexadecimal pixel values on color background picked from input video,
- the text color is picked in such way so its always visible.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">axis</samp></dt>
- <dd><p>Draw rows and columns numbers on left and top of video.
- </p>
- </dd>
- <dt><samp class="option">opacity</samp></dt>
- <dd><p>Set background opacity.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Set display number format. Can be <code class="code">hex</code>, or <code class="code">dec</code>. Default is <code class="code">hex</code>.
- </p>
- </dd>
- <dt><samp class="option">components</samp></dt>
- <dd><p>Set pixel components to display. By default all pixel components are displayed.
- </p></dd>
- </dl>
- <a name="Commands-79"></a>
- <h4 class="subsection">39.51.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-79" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-79" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options excluding <code class="code">size</code> option.
- </p>
- <a name="dblur"></a>
- <h3 class="section">39.52 dblur<span class="pull-right"><a class="anchor hidden-xs" href="#dblur" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dblur" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Directional blur filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">angle</samp></dt>
- <dd><p>Set angle of directional blur. Default is <code class="code">45</code>.
- </p>
- </dd>
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set radius of directional blur. Default is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. By default all planes are filtered.
- </p></dd>
- </dl>
- <a name="Commands-80"></a>
- <h4 class="subsection">39.52.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-80" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-80" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="dctdnoiz"></a>
- <h3 class="section">39.53 dctdnoiz<span class="pull-right"><a class="anchor hidden-xs" href="#dctdnoiz" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dctdnoiz" aria-hidden="true">TOC</a></span></h3>
- <p>Denoise frames using 2D DCT (frequency domain filtering).
- </p>
- <p>This filter is not designed for real time.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sigma, s</samp></dt>
- <dd><p>Set the noise sigma constant.
- </p>
- <p>This <var class="var">sigma</var> defines a hard threshold of <code class="code">3 * sigma</code>; every DCT
- coefficient (absolute value) below this threshold with be dropped.
- </p>
- <p>If you need a more advanced filtering, see <samp class="option">expr</samp>.
- </p>
- <p>Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set number overlapping pixels for each block. Since the filter can be slow, you
- may want to reduce this value, at the cost of a less effective filter and the
- risk of various artefacts.
- </p>
- <p>If the overlapping value doesn’t permit processing the whole input width or
- height, a warning will be displayed and according borders won’t be denoised.
- </p>
- <p>Default value is <var class="var">blocksize</var>-1, which is the best possible setting.
- </p>
- </dd>
- <dt><samp class="option">expr, e</samp></dt>
- <dd><p>Set the coefficient factor expression.
- </p>
- <p>For each coefficient of a DCT block, this expression will be evaluated as a
- multiplier value for the coefficient.
- </p>
- <p>If this is option is set, the <samp class="option">sigma</samp> option will be ignored.
- </p>
- <p>The absolute value of the coefficient can be accessed through the <var class="var">c</var>
- variable.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the <var class="var">blocksize</var> using the number of bits. <code class="code">1<<<var class="var">n</var></code> defines the
- <var class="var">blocksize</var>, which is the width and height of the processed blocks.
- </p>
- <p>The default value is <var class="var">3</var> (8x8) and can be raised to <var class="var">4</var> for a
- <var class="var">blocksize</var> of 16x16. Note that changing this setting has huge consequences
- on the speed processing. Also, a larger block size does not necessarily means a
- better de-noising.
- </p></dd>
- </dl>
- <a name="Examples-108"></a>
- <h4 class="subsection">39.53.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-108" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-108" aria-hidden="true">TOC</a></span></h4>
- <p>Apply a denoise with a <samp class="option">sigma</samp> of <code class="code">4.5</code>:
- </p><div class="example">
- <pre class="example-preformatted">dctdnoiz=4.5
- </pre></div>
- <p>The same operation can be achieved using the expression system:
- </p><div class="example">
- <pre class="example-preformatted">dctdnoiz=e='gte(c, 4.5*3)'
- </pre></div>
- <p>Violent denoise using a block size of <code class="code">16x16</code>:
- </p><div class="example">
- <pre class="example-preformatted">dctdnoiz=15:n=4
- </pre></div>
- <a name="deband"></a>
- <h3 class="section">39.54 deband<span class="pull-right"><a class="anchor hidden-xs" href="#deband" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deband" aria-hidden="true">TOC</a></span></h3>
- <p>Remove banding artifacts from input video.
- It works by replacing banded pixels with average value of referenced pixels.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">1thr</samp></dt>
- <dt><samp class="option">2thr</samp></dt>
- <dt><samp class="option">3thr</samp></dt>
- <dt><samp class="option">4thr</samp></dt>
- <dd><p>Set banding detection threshold for each plane. Default is 0.02.
- Valid range is 0.00003 to 0.5.
- If difference between current pixel and reference pixel is less than threshold,
- it will be considered as banded.
- </p>
- </dd>
- <dt><samp class="option">range, r</samp></dt>
- <dd><p>Banding detection range in pixels. Default is 16. If positive, random number
- in range 0 to set value will be used. If negative, exact absolute value
- will be used.
- The range defines square of four pixels around current pixel.
- </p>
- </dd>
- <dt><samp class="option">direction, d</samp></dt>
- <dd><p>Set direction in radians from which four pixel will be compared. If positive,
- random direction from 0 to set direction will be picked. If negative, exact of
- absolute value will be picked. For example direction 0, -PI or -2*PI radians
- will pick only pixels on same row and -PI/2 will pick only pixels on same
- column.
- </p>
- </dd>
- <dt><samp class="option">blur, b</samp></dt>
- <dd><p>If enabled, current pixel is compared with average value of all four
- surrounding pixels. The default is enabled. If disabled current pixel is
- compared with all four surrounding pixels. The pixel is considered banded
- if only all four differences with surrounding pixels are less than threshold.
- </p>
- </dd>
- <dt><samp class="option">coupling, c</samp></dt>
- <dd><p>If enabled, current pixel is changed if and only if all pixel components are banded,
- e.g. banding detection threshold is triggered for all color components.
- The default is disabled.
- </p></dd>
- </dl>
- <a name="Commands-81"></a>
- <h4 class="subsection">39.54.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-81" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-81" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="deblock"></a>
- <h3 class="section">39.55 deblock<span class="pull-right"><a class="anchor hidden-xs" href="#deblock" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deblock" aria-hidden="true">TOC</a></span></h3>
- <p>Remove blocking artifacts from input video.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">filter</samp></dt>
- <dd><p>Set filter type, can be <var class="var">weak</var> or <var class="var">strong</var>. Default is <var class="var">strong</var>.
- This controls what kind of deblocking is applied.
- </p>
- </dd>
- <dt><samp class="option">block</samp></dt>
- <dd><p>Set size of block, allowed range is from 4 to 512. Default is <var class="var">8</var>.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dt><samp class="option">beta</samp></dt>
- <dt><samp class="option">gamma</samp></dt>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set blocking detection thresholds. Allowed range is 0 to 1.
- Defaults are: <var class="var">0.098</var> for <var class="var">alpha</var> and <var class="var">0.05</var> for the rest.
- Using higher threshold gives more deblocking strength.
- Setting <var class="var">alpha</var> controls threshold detection at exact edge of block.
- Remaining options controls threshold detection near the edge. Each one for
- below/above or left/right. Setting any of those to <var class="var">0</var> disables
- deblocking.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default is to filter all available planes.
- </p></dd>
- </dl>
- <a name="Examples-109"></a>
- <h4 class="subsection">39.55.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-109" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-109" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Deblock using weak filter and block size of 4 pixels.
- <div class="example">
- <pre class="example-preformatted">deblock=filter=weak:block=4
- </pre></div>
- </li><li>Deblock using strong filter, block size of 4 pixels and custom thresholds for
- deblocking more edges.
- <div class="example">
- <pre class="example-preformatted">deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05
- </pre></div>
- </li><li>Similar as above, but filter only first plane.
- <div class="example">
- <pre class="example-preformatted">deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=1
- </pre></div>
- </li><li>Similar as above, but filter only second and third plane.
- <div class="example">
- <pre class="example-preformatted">deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=6
- </pre></div>
- </li></ul>
- <a name="Commands-82"></a>
- <h4 class="subsection">39.55.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-82" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-82" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a class="anchor" id="decimate"></a><a name="decimate-1"></a>
- <h3 class="section">39.56 decimate<span class="pull-right"><a class="anchor hidden-xs" href="#decimate-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-decimate-1" aria-hidden="true">TOC</a></span></h3>
- <p>Drop duplicated frames at regular intervals.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">cycle</samp></dt>
- <dd><p>Set the number of frames from which one will be dropped. Setting this to
- <var class="var">N</var> means one frame in every batch of <var class="var">N</var> frames will be dropped.
- Default is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">dupthresh</samp></dt>
- <dd><p>Set the threshold for duplicate detection. If the difference metric for a frame
- is less than or equal to this value, then it is declared as duplicate. Default
- is <code class="code">1.1</code>
- </p>
- </dd>
- <dt><samp class="option">scthresh</samp></dt>
- <dd><p>Set scene change threshold. Default is <code class="code">15</code>.
- </p>
- </dd>
- <dt><samp class="option">blockx</samp></dt>
- <dt><samp class="option">blocky</samp></dt>
- <dd><p>Set the size of the x and y-axis blocks used during metric calculations.
- Larger blocks give better noise suppression, but also give worse detection of
- small movements. Must be a power of two. Default is <code class="code">32</code>.
- </p>
- </dd>
- <dt><samp class="option">ppsrc</samp></dt>
- <dd><p>Mark main input as a pre-processed input and activate clean source input
- stream. This allows the input to be pre-processed with various filters to help
- the metrics calculation while keeping the frame selection lossless. When set to
- <code class="code">1</code>, the first stream is for the pre-processed input, and the second
- stream is the clean source from where the kept frames are chosen. Default is
- <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">chroma</samp></dt>
- <dd><p>Set whether or not chroma is considered in the metric calculations. Default is
- <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">mixed</samp></dt>
- <dd><p>Set whether or not the input only partially contains content to be decimated.
- Default is <code class="code">false</code>.
- If enabled video output stream will be in variable frame rate.
- </p></dd>
- </dl>
- <a name="deconvolve"></a>
- <h3 class="section">39.57 deconvolve<span class="pull-right"><a class="anchor hidden-xs" href="#deconvolve" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deconvolve" aria-hidden="true">TOC</a></span></h3>
- <p>Apply 2D deconvolution of video stream in frequency domain using second stream
- as impulse.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process.
- </p>
- </dd>
- <dt><samp class="option">impulse</samp></dt>
- <dd><p>Set which impulse video frames will be processed, can be <var class="var">first</var>
- or <var class="var">all</var>. Default is <var class="var">all</var>.
- </p>
- </dd>
- <dt><samp class="option">noise</samp></dt>
- <dd><p>Set noise when doing divisions. Default is <var class="var">0.0000001</var>. Useful when width
- and height are not same and not power of 2 or if stream prior to convolving
- had noise.
- </p></dd>
- </dl>
- <p>The <code class="code">deconvolve</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="dedot"></a>
- <h3 class="section">39.58 dedot<span class="pull-right"><a class="anchor hidden-xs" href="#dedot" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dedot" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce cross-luminance (dot-crawl) and cross-color (rainbows) from video.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">m</samp></dt>
- <dd><p>Set mode of operation. Can be combination of <var class="var">dotcrawl</var> for cross-luminance reduction and/or
- <var class="var">rainbows</var> for cross-color reduction.
- </p>
- </dd>
- <dt><samp class="option">lt</samp></dt>
- <dd><p>Set spatial luma threshold. Lower values increases reduction of cross-luminance.
- </p>
- </dd>
- <dt><samp class="option">tl</samp></dt>
- <dd><p>Set tolerance for temporal luma. Higher values increases reduction of cross-luminance.
- </p>
- </dd>
- <dt><samp class="option">tc</samp></dt>
- <dd><p>Set tolerance for chroma temporal variation. Higher values increases reduction of cross-color.
- </p>
- </dd>
- <dt><samp class="option">ct</samp></dt>
- <dd><p>Set temporal chroma threshold. Lower values increases reduction of cross-color.
- </p></dd>
- </dl>
- <a name="deflate"></a>
- <h3 class="section">39.59 deflate<span class="pull-right"><a class="anchor hidden-xs" href="#deflate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deflate" aria-hidden="true">TOC</a></span></h3>
- <p>Apply deflate effect to the video.
- </p>
- <p>This filter replaces the pixel by the local(3x3) average by taking into account
- only values lower than the pixel.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold0</samp></dt>
- <dt><samp class="option">threshold1</samp></dt>
- <dt><samp class="option">threshold2</samp></dt>
- <dt><samp class="option">threshold3</samp></dt>
- <dd><p>Limit the maximum change for each plane, default is 65535.
- If 0, plane will remain unchanged.
- </p></dd>
- </dl>
- <a name="Commands-83"></a>
- <h4 class="subsection">39.59.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-83" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-83" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="deflicker"></a>
- <h3 class="section">39.60 deflicker<span class="pull-right"><a class="anchor hidden-xs" href="#deflicker" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deflicker" aria-hidden="true">TOC</a></span></h3>
- <p>Remove temporal frame luminance variations.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set moving-average filter size in frames. Default is 5. Allowed range is 2 - 129.
- </p>
- </dd>
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set averaging mode to smooth temporal luminance variations.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">am</samp>’</dt>
- <dd><p>Arithmetic mean
- </p>
- </dd>
- <dt>‘<samp class="samp">gm</samp>’</dt>
- <dd><p>Geometric mean
- </p>
- </dd>
- <dt>‘<samp class="samp">hm</samp>’</dt>
- <dd><p>Harmonic mean
- </p>
- </dd>
- <dt>‘<samp class="samp">qm</samp>’</dt>
- <dd><p>Quadratic mean
- </p>
- </dd>
- <dt>‘<samp class="samp">cm</samp>’</dt>
- <dd><p>Cubic mean
- </p>
- </dd>
- <dt>‘<samp class="samp">pm</samp>’</dt>
- <dd><p>Power mean
- </p>
- </dd>
- <dt>‘<samp class="samp">median</samp>’</dt>
- <dd><p>Median
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">bypass</samp></dt>
- <dd><p>Do not actually modify frame. Useful when one only wants metadata.
- </p></dd>
- </dl>
- <a name="dejudder"></a>
- <h3 class="section">39.61 dejudder<span class="pull-right"><a class="anchor hidden-xs" href="#dejudder" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dejudder" aria-hidden="true">TOC</a></span></h3>
- <p>Remove judder produced by partially interlaced telecined content.
- </p>
- <p>Judder can be introduced, for instance, by <a class="ref" href="#pullup">pullup</a> filter. If the original
- source was partially telecined content then the output of <code class="code">pullup,dejudder</code>
- will have a variable frame rate. May change the recorded frame rate of the
- container. Aside from that change, this filter will not affect constant frame
- rate video.
- </p>
- <p>The option available in this filter is:
- </p><dl class="table">
- <dt><samp class="option">cycle</samp></dt>
- <dd><p>Specify the length of the window over which the judder repeats.
- </p>
- <p>Accepts any integer greater than 1. Useful values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">4</samp>’</dt>
- <dd><p>If the original was telecined from 24 to 30 fps (Film to NTSC).
- </p>
- </dd>
- <dt>‘<samp class="samp">5</samp>’</dt>
- <dd><p>If the original was telecined from 25 to 30 fps (PAL to NTSC).
- </p>
- </dd>
- <dt>‘<samp class="samp">20</samp>’</dt>
- <dd><p>If a mixture of the two.
- </p></dd>
- </dl>
- <p>The default is ‘<samp class="samp">4</samp>’.
- </p></dd>
- </dl>
- <a name="delogo"></a>
- <h3 class="section">39.62 delogo<span class="pull-right"><a class="anchor hidden-xs" href="#delogo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-delogo" aria-hidden="true">TOC</a></span></h3>
- <p>Suppress a TV station logo by a simple interpolation of the surrounding
- pixels. Just set a rectangle covering the logo and watch it disappear
- (and sometimes something even uglier appear - your mileage may vary).
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Specify the top left corner coordinates of the logo. They must be
- specified.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Specify the width and height of the logo to clear. They must be
- specified.
- </p>
- </dd>
- <dt><samp class="option">show</samp></dt>
- <dd><p>When set to 1, a green rectangle is drawn on the screen to simplify
- finding the right <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var>, and <var class="var">h</var> parameters.
- The default value is 0.
- </p>
- <p>The rectangle is drawn on the outermost pixels which will be (partly)
- replaced with interpolated values. The values of the next pixels
- immediately outside this rectangle in each direction will be used to
- compute the interpolated pixel values inside the rectangle.
- </p>
- </dd>
- </dl>
- <a name="Examples-110"></a>
- <h4 class="subsection">39.62.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-110" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-110" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Set a rectangle covering the area with top left corner coordinates 0,0
- and size 100x77:
- <div class="example">
- <pre class="example-preformatted">delogo=x=0:y=0:w=100:h=77
- </pre></div>
- </li></ul>
- <a class="anchor" id="derain"></a><a name="derain-1"></a>
- <h3 class="section">39.63 derain<span class="pull-right"><a class="anchor hidden-xs" href="#derain-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-derain-1" aria-hidden="true">TOC</a></span></h3>
- <p>Remove the rain in the input image/video by applying the derain methods based on
- convolutional neural networks. Supported models:
- </p>
- <ul class="itemize mark-bullet">
- <li>Recurrent Squeeze-and-Excitation Context Aggregation Net (RESCAN).
- See <a class="url" href="http://openaccess.thecvf.com/content_ECCV_2018/papers/Xia_Li_Recurrent_Squeeze-and-Excitation_Context_ECCV_2018_paper.pdf">http://openaccess.thecvf.com/content_ECCV_2018/papers/Xia_Li_Recurrent_Squeeze-and-Excitation_Context_ECCV_2018_paper.pdf</a>.
- </li></ul>
- <p>Training as well as model generation scripts are provided in
- the repository at <a class="url" href="https://github.com/XueweiMeng/derain_filter.git">https://github.com/XueweiMeng/derain_filter.git</a>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">filter_type</samp></dt>
- <dd><p>Specify which filter to use. This option accepts the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">derain</samp>’</dt>
- <dd><p>Derain filter. To conduct derain filter, you need to use a derain model.
- </p>
- </dd>
- <dt>‘<samp class="samp">dehaze</samp>’</dt>
- <dd><p>Dehaze filter. To conduct dehaze filter, you need to use a dehaze model.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">derain</samp>’.
- </p>
- </dd>
- <dt><samp class="option">dnn_backend</samp></dt>
- <dd><p>Specify which DNN backend to use for model loading and execution. This option accepts
- the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">tensorflow</samp>’</dt>
- <dd><p>TensorFlow backend. To enable this backend you
- need to install the TensorFlow for C library (see
- <a class="url" href="https://www.tensorflow.org/install/lang_c">https://www.tensorflow.org/install/lang_c</a>) and configure FFmpeg with
- <code class="code">--enable-libtensorflow</code>
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">model</samp></dt>
- <dd><p>Set path to model file specifying network architecture and its parameters.
- Note that different backends use different file formats. TensorFlow can load files for only its format.
- </p></dd>
- </dl>
- <p>To get full functionality (such as async execution), please use the <a class="ref" href="#dnn_005fprocessing">dnn_processing</a> filter.
- </p>
- <a name="deshake"></a>
- <h3 class="section">39.64 deshake<span class="pull-right"><a class="anchor hidden-xs" href="#deshake" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deshake" aria-hidden="true">TOC</a></span></h3>
- <p>Attempt to fix small changes in horizontal and/or vertical shift. This
- filter helps remove camera shake from hand-holding a camera, bumping a
- tripod, moving on a vehicle, etc.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Specify a rectangular area where to limit the search for motion
- vectors.
- If desired the search for motion vectors can be limited to a
- rectangular area of the frame defined by its top left corner, width
- and height. These parameters have the same meaning as the drawbox
- filter which can be used to visualise the position of the bounding
- box.
- </p>
- <p>This is useful when simultaneous movement of subjects within the frame
- might be confused for camera motion by the motion vector search.
- </p>
- <p>If any or all of <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var> and <var class="var">h</var> are set to -1
- then the full frame is used. This allows later options to be set
- without specifying the bounding box for the motion vector search.
- </p>
- <p>Default - search the whole frame.
- </p>
- </dd>
- <dt><samp class="option">rx</samp></dt>
- <dt><samp class="option">ry</samp></dt>
- <dd><p>Specify the maximum extent of movement in x and y directions in the
- range 0-64 pixels. Default 16.
- </p>
- </dd>
- <dt><samp class="option">edge</samp></dt>
- <dd><p>Specify how to generate pixels to fill blanks at the edge of the
- frame. Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">blank, 0</samp>’</dt>
- <dd><p>Fill zeroes at blank locations
- </p></dd>
- <dt>‘<samp class="samp">original, 1</samp>’</dt>
- <dd><p>Original image at blank locations
- </p></dd>
- <dt>‘<samp class="samp">clamp, 2</samp>’</dt>
- <dd><p>Extruded edge value at blank locations
- </p></dd>
- <dt>‘<samp class="samp">mirror, 3</samp>’</dt>
- <dd><p>Mirrored edge at blank locations
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">mirror</samp>’.
- </p>
- </dd>
- <dt><samp class="option">blocksize</samp></dt>
- <dd><p>Specify the blocksize to use for motion search. Range 4-128 pixels,
- default 8.
- </p>
- </dd>
- <dt><samp class="option">contrast</samp></dt>
- <dd><p>Specify the contrast threshold for blocks. Only blocks with more than
- the specified contrast (difference between darkest and lightest
- pixels) will be considered. Range 1-255, default 125.
- </p>
- </dd>
- <dt><samp class="option">search</samp></dt>
- <dd><p>Specify the search strategy. Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">exhaustive, 0</samp>’</dt>
- <dd><p>Set exhaustive search
- </p></dd>
- <dt>‘<samp class="samp">less, 1</samp>’</dt>
- <dd><p>Set less exhaustive search.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">exhaustive</samp>’.
- </p>
- </dd>
- <dt><samp class="option">filename</samp></dt>
- <dd><p>If set then a detailed log of the motion search is written to the
- specified file.
- </p>
- </dd>
- </dl>
- <a name="despill"></a>
- <h3 class="section">39.65 despill<span class="pull-right"><a class="anchor hidden-xs" href="#despill" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-despill" aria-hidden="true">TOC</a></span></h3>
- <p>Remove unwanted contamination of foreground colors, caused by reflected color of
- greenscreen or bluescreen.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set what type of despill to use.
- </p>
- </dd>
- <dt><samp class="option">mix</samp></dt>
- <dd><p>Set how spillmap will be generated.
- </p>
- </dd>
- <dt><samp class="option">expand</samp></dt>
- <dd><p>Set how much to get rid of still remaining spill.
- </p>
- </dd>
- <dt><samp class="option">red</samp></dt>
- <dd><p>Controls amount of red in spill area.
- </p>
- </dd>
- <dt><samp class="option">green</samp></dt>
- <dd><p>Controls amount of green in spill area.
- Should be -1 for greenscreen.
- </p>
- </dd>
- <dt><samp class="option">blue</samp></dt>
- <dd><p>Controls amount of blue in spill area.
- Should be -1 for bluescreen.
- </p>
- </dd>
- <dt><samp class="option">brightness</samp></dt>
- <dd><p>Controls brightness of spill area, preserving colors.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>Modify alpha from generated spillmap.
- </p></dd>
- </dl>
- <a name="Commands-84"></a>
- <h4 class="subsection">39.65.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-84" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-84" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="detelecine"></a>
- <h3 class="section">39.66 detelecine<span class="pull-right"><a class="anchor hidden-xs" href="#detelecine" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-detelecine" aria-hidden="true">TOC</a></span></h3>
- <p>Apply an exact inverse of the telecine operation. It requires a predefined
- pattern specified using the pattern option which must be the same as that passed
- to the telecine filter.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">first_field</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">top, t</samp>’</dt>
- <dd><p>top field first
- </p></dd>
- <dt>‘<samp class="samp">bottom, b</samp>’</dt>
- <dd><p>bottom field first
- The default value is <code class="code">top</code>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">pattern</samp></dt>
- <dd><p>A string of numbers representing the pulldown pattern you wish to apply.
- The default value is <code class="code">23</code>.
- </p>
- </dd>
- <dt><samp class="option">start_frame</samp></dt>
- <dd><p>A number representing position of the first frame with respect to the telecine
- pattern. This is to be used if the stream is cut. The default value is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="dilation"></a><a name="dilation-1"></a>
- <h3 class="section">39.67 dilation<span class="pull-right"><a class="anchor hidden-xs" href="#dilation-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dilation-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply dilation effect to the video.
- </p>
- <p>This filter replaces the pixel by the local(3x3) maximum.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold0</samp></dt>
- <dt><samp class="option">threshold1</samp></dt>
- <dt><samp class="option">threshold2</samp></dt>
- <dt><samp class="option">threshold3</samp></dt>
- <dd><p>Limit the maximum change for each plane, default is 65535.
- If 0, plane will remain unchanged.
- </p>
- </dd>
- <dt><samp class="option">coordinates</samp></dt>
- <dd><p>Flag which specifies the pixel to refer to. Default is 255 i.e. all eight
- pixels are used.
- </p>
- <p>Flags to local 3x3 coordinates maps like this:
- </p>
- <p>1 2 3
- 4 5
- 6 7 8
- </p></dd>
- </dl>
- <a name="Commands-85"></a>
- <h4 class="subsection">39.67.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-85" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-85" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="displace"></a>
- <h3 class="section">39.68 displace<span class="pull-right"><a class="anchor hidden-xs" href="#displace" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-displace" aria-hidden="true">TOC</a></span></h3>
- <p>Displace pixels as indicated by second and third input stream.
- </p>
- <p>It takes three input streams and outputs one stream, the first input is the
- source, and second and third input are displacement maps.
- </p>
- <p>The second input specifies how much to displace pixels along the
- x-axis, while the third input specifies how much to displace pixels
- along the y-axis.
- If one of displacement map streams terminates, last frame from that
- displacement map will be used.
- </p>
- <p>Note that once generated, displacements maps can be reused over and over again.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">edge</samp></dt>
- <dd><p>Set displace behavior for pixels that are out of range.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">blank</samp>’</dt>
- <dd><p>Missing pixels are replaced by black pixels.
- </p>
- </dd>
- <dt>‘<samp class="samp">smear</samp>’</dt>
- <dd><p>Adjacent pixels will spread out to replace missing pixels.
- </p>
- </dd>
- <dt>‘<samp class="samp">wrap</samp>’</dt>
- <dd><p>Out of range pixels are wrapped so they point to pixels of other side.
- </p>
- </dd>
- <dt>‘<samp class="samp">mirror</samp>’</dt>
- <dd><p>Out of range pixels will be replaced with mirrored pixels.
- </p></dd>
- </dl>
- <p>Default is ‘<samp class="samp">smear</samp>’.
- </p>
- </dd>
- </dl>
- <a name="Examples-111"></a>
- <h4 class="subsection">39.68.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-111" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-111" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Add ripple effect to rgb input of video size hd720:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f lavfi -i nullsrc=s=hd720,lutrgb=128:128:128 -f lavfi -i nullsrc=s=hd720,geq='r=128+30*sin(2*PI*X/400+T):g=128+30*sin(2*PI*X/400+T):b=128+30*sin(2*PI*X/400+T)' -lavfi '[0][1][2]displace' OUTPUT
- </pre></div>
- </li><li>Add wave effect to rgb input of video size hd720:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -f lavfi -i nullsrc=hd720,geq='r=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T)):g=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T)):b=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T))' -lavfi '[1]split[x][y],[0][x][y]displace' OUTPUT
- </pre></div>
- </li></ul>
- <a name="dnn_005fclassify"></a>
- <h3 class="section">39.69 dnn_classify<span class="pull-right"><a class="anchor hidden-xs" href="#dnn_005fclassify" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dnn_005fclassify" aria-hidden="true">TOC</a></span></h3>
- <p>Do classification with deep neural networks based on bounding boxes.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dnn_backend</samp></dt>
- <dd><p>Specify which DNN backend to use for model loading and execution. This option accepts
- only openvino now, tensorflow backends will be added.
- </p>
- </dd>
- <dt><samp class="option">model</samp></dt>
- <dd><p>Set path to model file specifying network architecture and its parameters.
- Note that different backends use different file formats.
- </p>
- </dd>
- <dt><samp class="option">input</samp></dt>
- <dd><p>Set the input name of the dnn network.
- </p>
- </dd>
- <dt><samp class="option">output</samp></dt>
- <dd><p>Set the output name of the dnn network.
- </p>
- </dd>
- <dt><samp class="option">confidence</samp></dt>
- <dd><p>Set the confidence threshold (default: 0.5).
- </p>
- </dd>
- <dt><samp class="option">labels</samp></dt>
- <dd><p>Set path to label file specifying the mapping between label id and name.
- Each label name is written in one line, tailing spaces and empty lines are skipped.
- The first line is the name of label id 0,
- and the second line is the name of label id 1, etc.
- The label id is considered as name if the label file is not provided.
- </p>
- </dd>
- <dt><samp class="option">backend_configs</samp></dt>
- <dd><p>Set the configs to be passed into backend
- </p>
- <p>For tensorflow backend, you can set its configs with <samp class="option">sess_config</samp> options,
- please use tools/python/tf_sess_config.py to get the configs for your system.
- </p>
- </dd>
- </dl>
- <a name="dnn_005fdetect"></a>
- <h3 class="section">39.70 dnn_detect<span class="pull-right"><a class="anchor hidden-xs" href="#dnn_005fdetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dnn_005fdetect" aria-hidden="true">TOC</a></span></h3>
- <p>Do object detection with deep neural networks.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dnn_backend</samp></dt>
- <dd><p>Specify which DNN backend to use for model loading and execution. This option accepts
- only openvino now, tensorflow backends will be added.
- </p>
- </dd>
- <dt><samp class="option">model</samp></dt>
- <dd><p>Set path to model file specifying network architecture and its parameters.
- Note that different backends use different file formats.
- </p>
- </dd>
- <dt><samp class="option">input</samp></dt>
- <dd><p>Set the input name of the dnn network.
- </p>
- </dd>
- <dt><samp class="option">output</samp></dt>
- <dd><p>Set the output name of the dnn network.
- </p>
- </dd>
- <dt><samp class="option">confidence</samp></dt>
- <dd><p>Set the confidence threshold (default: 0.5).
- </p>
- </dd>
- <dt><samp class="option">labels</samp></dt>
- <dd><p>Set path to label file specifying the mapping between label id and name.
- Each label name is written in one line, tailing spaces and empty lines are skipped.
- The first line is the name of label id 0 (usually it is ’background’),
- and the second line is the name of label id 1, etc.
- The label id is considered as name if the label file is not provided.
- </p>
- </dd>
- <dt><samp class="option">backend_configs</samp></dt>
- <dd><p>Set the configs to be passed into backend. To use async execution, set async (default: set).
- Roll back to sync execution if the backend does not support async.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="dnn_005fprocessing"></a><a name="dnn_005fprocessing-1"></a>
- <h3 class="section">39.71 dnn_processing<span class="pull-right"><a class="anchor hidden-xs" href="#dnn_005fprocessing-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dnn_005fprocessing-1" aria-hidden="true">TOC</a></span></h3>
- <p>Do image processing with deep neural networks. It works together with another filter
- which converts the pixel format of the Frame to what the dnn network requires.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dnn_backend</samp></dt>
- <dd><p>Specify which DNN backend to use for model loading and execution. This option accepts
- the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">tensorflow</samp>’</dt>
- <dd><p>TensorFlow backend. To enable this backend you
- need to install the TensorFlow for C library (see
- <a class="url" href="https://www.tensorflow.org/install/lang_c">https://www.tensorflow.org/install/lang_c</a>) and configure FFmpeg with
- <code class="code">--enable-libtensorflow</code>
- </p>
- </dd>
- <dt>‘<samp class="samp">openvino</samp>’</dt>
- <dd><p>OpenVINO backend. To enable this backend you
- need to build and install the OpenVINO for C library (see
- <a class="url" href="https://github.com/openvinotoolkit/openvino/blob/master/build-instruction.md">https://github.com/openvinotoolkit/openvino/blob/master/build-instruction.md</a>) and configure FFmpeg with
- <code class="code">--enable-libopenvino</code> (–extra-cflags=-I... –extra-ldflags=-L... might
- be needed if the header files and libraries are not installed into system path)
- </p>
- </dd>
- <dt>‘<samp class="samp">torch</samp>’</dt>
- <dd><p>Libtorch backend. To enable this backend you need to build and install Libtroch
- for C++ library. Please download cxx11 ABI version (see
- <a class="url" href="https://pytorch.org/get-started/locally">https://pytorch.org/get-started/locally</a>)
- and configure FFmpeg with <code class="code">--enable-libtorch
- --extra-cflags=-I/libtorch_root/libtorch/include
- --extra-cflags=-I/libtorch_root/libtorch/include/torch/csrc/api/include
- --extra-ldflags=-L/libtorch_root/libtorch/lib/</code>
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">model</samp></dt>
- <dd><p>Set path to model file specifying network architecture and its parameters.
- Note that different backends use different file formats. TensorFlow, OpenVINO
- and Libtorch backend can load files for only its format.
- </p>
- </dd>
- <dt><samp class="option">input</samp></dt>
- <dd><p>Set the input name of the dnn network.
- </p>
- </dd>
- <dt><samp class="option">output</samp></dt>
- <dd><p>Set the output name of the dnn network.
- </p>
- </dd>
- <dt><samp class="option">backend_configs</samp></dt>
- <dd><p>Set the configs to be passed into backend. To use async execution, set async (default: set).
- Roll back to sync execution if the backend does not support async.
- </p>
- <p>For tensorflow backend, you can set its configs with <samp class="option">sess_config</samp> options,
- please use tools/python/tf_sess_config.py to get the configs of TensorFlow backend for your system.
- </p>
- </dd>
- </dl>
- <a name="Examples-112"></a>
- <h4 class="subsection">39.71.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-112" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-112" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Remove rain in rgb24 frame with can.pb (see <a class="ref" href="#derain">derain</a> filter):
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -i rain.jpg -vf format=rgb24,dnn_processing=dnn_backend=tensorflow:model=can.pb:input=x:output=y derain.jpg
- </pre></div>
- </li><li>Handle the Y channel with srcnn.pb (see <a class="ref" href="#sr">sr</a> filter) for frame with yuv420p (planar YUV formats supported):
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -i 480p.jpg -vf format=yuv420p,scale=w=iw*2:h=ih*2,dnn_processing=dnn_backend=tensorflow:model=srcnn.pb:input=x:output=y -y srcnn.jpg
- </pre></div>
- </li><li>Handle the Y channel with espcn.pb (see <a class="ref" href="#sr">sr</a> filter), which changes frame size, for format yuv420p (planar YUV formats supported),
- please use tools/python/tf_sess_config.py to get the configs of TensorFlow backend for your system.
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -i 480p.jpg -vf format=yuv420p,dnn_processing=dnn_backend=tensorflow:model=espcn.pb:input=x:output=y:backend_configs=sess_config=0x10022805320e09cdccccccccccec3f20012a01303801 -y tmp.espcn.jpg
- </pre></div>
- </li></ul>
- <a name="drawbox"></a>
- <h3 class="section">39.72 drawbox<span class="pull-right"><a class="anchor hidden-xs" href="#drawbox" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drawbox" aria-hidden="true">TOC</a></span></h3>
- <p>Draw a colored box on the input image.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The expressions which specify the top left corner coordinates of the box. It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>The expressions which specify the width and height of the box; if 0 they are interpreted as
- the input width and height. It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">color, c</samp></dt>
- <dd><p>Specify the color of the box to write. For the general syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>. If the special
- value <code class="code">invert</code> is used, the box edge color is the same as the
- video with inverted luma.
- </p>
- </dd>
- <dt><samp class="option">thickness, t</samp></dt>
- <dd><p>The expression which sets the thickness of the box edge.
- A value of <code class="code">fill</code> will create a filled box. Default value is <code class="code">3</code>.
- </p>
- <p>See below for the list of accepted constants.
- </p>
- </dd>
- <dt><samp class="option">replace</samp></dt>
- <dd><p>Applicable if the input has alpha. With value <code class="code">1</code>, the pixels of the painted box
- will overwrite the video’s color and alpha pixels.
- Default is <code class="code">0</code>, which composites the box onto the input, leaving the video’s alpha intact.
- </p></dd>
- </dl>
- <p>The parameters for <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var> and <var class="var">h</var> and <var class="var">t</var> are expressions containing the
- following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">dar</samp></dt>
- <dd><p>The input display aspect ratio, it is the same as (<var class="var">w</var> / <var class="var">h</var>) * <var class="var">sar</var>.
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">in_h, ih</samp></dt>
- <dt><samp class="option">in_w, iw</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>The input sample aspect ratio.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The x and y offset coordinates where the box is drawn.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The width and height of the drawn box.
- </p>
- </dd>
- <dt><samp class="option">box_source</samp></dt>
- <dd><p>Box source can be set as side_data_detection_bboxes if you want to use box data in
- detection bboxes of side data.
- </p>
- <p>If <var class="var">box_source</var> is set, the <var class="var">x</var>, <var class="var">y</var>, <var class="var">width</var> and <var class="var">height</var> will be ignored and
- still use box data in detection bboxes of side data. So please do not use this parameter if you were
- not sure about the box source.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The thickness of the drawn box.
- </p>
- <p>These constants allow the <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var>, <var class="var">h</var> and <var class="var">t</var> expressions to refer to
- each other, so you may for example specify <code class="code">y=x/dar</code> or <code class="code">h=w/dar</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-113"></a>
- <h4 class="subsection">39.72.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-113" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-113" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Draw a black box around the edge of the input image:
- <div class="example">
- <pre class="example-preformatted">drawbox
- </pre></div>
- </li><li>Draw a box with color red and an opacity of 50%:
- <div class="example">
- <pre class="example-preformatted">drawbox=10:20:200:60:red@0.5
- </pre></div>
- <p>The previous example can be specified as:
- </p><div class="example">
- <pre class="example-preformatted">drawbox=x=10:y=20:w=200:h=60:color=red@0.5
- </pre></div>
- </li><li>Fill the box with pink color:
- <div class="example">
- <pre class="example-preformatted">drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=fill
- </pre></div>
- </li><li>Draw a 2-pixel red 2.40:1 mask:
- <div class="example">
- <pre class="example-preformatted">drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red
- </pre></div>
- </li></ul>
- <a name="Commands-86"></a>
- <h4 class="subsection">39.72.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-86" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-86" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same commands as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a class="anchor" id="drawgraph"></a><a name="drawgraph-1"></a>
- <h3 class="section">39.73 drawgraph<span class="pull-right"><a class="anchor hidden-xs" href="#drawgraph-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drawgraph-1" aria-hidden="true">TOC</a></span></h3>
- <p>Draw a graph using input video metadata.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">m1</samp></dt>
- <dd><p>Set 1st frame metadata key from which metadata values will be used to draw a graph.
- </p>
- </dd>
- <dt><samp class="option">fg1</samp></dt>
- <dd><p>Set 1st foreground color expression.
- </p>
- </dd>
- <dt><samp class="option">m2</samp></dt>
- <dd><p>Set 2nd frame metadata key from which metadata values will be used to draw a graph.
- </p>
- </dd>
- <dt><samp class="option">fg2</samp></dt>
- <dd><p>Set 2nd foreground color expression.
- </p>
- </dd>
- <dt><samp class="option">m3</samp></dt>
- <dd><p>Set 3rd frame metadata key from which metadata values will be used to draw a graph.
- </p>
- </dd>
- <dt><samp class="option">fg3</samp></dt>
- <dd><p>Set 3rd foreground color expression.
- </p>
- </dd>
- <dt><samp class="option">m4</samp></dt>
- <dd><p>Set 4th frame metadata key from which metadata values will be used to draw a graph.
- </p>
- </dd>
- <dt><samp class="option">fg4</samp></dt>
- <dd><p>Set 4th foreground color expression.
- </p>
- </dd>
- <dt><samp class="option">min</samp></dt>
- <dd><p>Set minimal value of metadata value.
- </p>
- </dd>
- <dt><samp class="option">max</samp></dt>
- <dd><p>Set maximal value of metadata value.
- </p>
- </dd>
- <dt><samp class="option">bg</samp></dt>
- <dd><p>Set graph background color. Default is white.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set graph mode.
- </p>
- <p>Available values for mode is:
- </p><dl class="table">
- <dt>‘<samp class="samp">bar</samp>’</dt>
- <dt>‘<samp class="samp">dot</samp>’</dt>
- <dt>‘<samp class="samp">line</samp>’</dt>
- </dl>
- <p>Default is <code class="code">line</code>.
- </p>
- </dd>
- <dt><samp class="option">slide</samp></dt>
- <dd><p>Set slide mode.
- </p>
- <p>Available values for slide is:
- </p><dl class="table">
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Draw new frame when right border is reached.
- </p>
- </dd>
- <dt>‘<samp class="samp">replace</samp>’</dt>
- <dd><p>Replace old columns with new ones.
- </p>
- </dd>
- <dt>‘<samp class="samp">scroll</samp>’</dt>
- <dd><p>Scroll from right to left.
- </p>
- </dd>
- <dt>‘<samp class="samp">rscroll</samp>’</dt>
- <dd><p>Scroll from left to right.
- </p>
- </dd>
- <dt>‘<samp class="samp">picture</samp>’</dt>
- <dd><p>Draw single picture.
- </p></dd>
- </dl>
- <p>Default is <code class="code">frame</code>.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set size of graph video. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- The default value is <code class="code">900x256</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the output frame rate. Default value is <code class="code">25</code>.
- </p>
- <p>The foreground color expressions can use the following variables:
- </p><dl class="table">
- <dt><samp class="option">MIN</samp></dt>
- <dd><p>Minimal value of metadata value.
- </p>
- </dd>
- <dt><samp class="option">MAX</samp></dt>
- <dd><p>Maximal value of metadata value.
- </p>
- </dd>
- <dt><samp class="option">VAL</samp></dt>
- <dd><p>Current metadata key value.
- </p></dd>
- </dl>
- <p>The color is defined as 0xAABBGGRR.
- </p></dd>
- </dl>
- <p>Example using metadata from <a class="ref" href="#signalstats">signalstats</a> filter:
- </p><div class="example">
- <pre class="example-preformatted">signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
- </pre></div>
- <p>Example using metadata from <a class="ref" href="#ebur128">ebur128</a> filter:
- </p><div class="example">
- <pre class="example-preformatted">ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5
- </pre></div>
- <a name="drawgrid"></a>
- <h3 class="section">39.74 drawgrid<span class="pull-right"><a class="anchor hidden-xs" href="#drawgrid" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drawgrid" aria-hidden="true">TOC</a></span></h3>
- <p>Draw a grid on the input image.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The expressions which specify the coordinates of some point of grid intersection (meant to configure offset). Both default to 0.
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>The expressions which specify the width and height of the grid cell, if 0 they are interpreted as the
- input width and height, respectively, minus <code class="code">thickness</code>, so image gets
- framed. Default to 0.
- </p>
- </dd>
- <dt><samp class="option">color, c</samp></dt>
- <dd><p>Specify the color of the grid. For the general syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>. If the special
- value <code class="code">invert</code> is used, the grid color is the same as the
- video with inverted luma.
- </p>
- </dd>
- <dt><samp class="option">thickness, t</samp></dt>
- <dd><p>The expression which sets the thickness of the grid line. Default value is <code class="code">1</code>.
- </p>
- <p>See below for the list of accepted constants.
- </p>
- </dd>
- <dt><samp class="option">replace</samp></dt>
- <dd><p>Applicable if the input has alpha. With <code class="code">1</code> the pixels of the painted grid
- will overwrite the video’s color and alpha pixels.
- Default is <code class="code">0</code>, which composites the grid onto the input, leaving the video’s alpha intact.
- </p></dd>
- </dl>
- <p>The parameters for <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var> and <var class="var">h</var> and <var class="var">t</var> are expressions containing the
- following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">dar</samp></dt>
- <dd><p>The input display aspect ratio, it is the same as (<var class="var">w</var> / <var class="var">h</var>) * <var class="var">sar</var>.
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">in_h, ih</samp></dt>
- <dt><samp class="option">in_w, iw</samp></dt>
- <dd><p>The input grid cell width and height.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>The input sample aspect ratio.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The x and y coordinates of some point of grid intersection (meant to configure offset).
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The width and height of the drawn cell.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The thickness of the drawn cell.
- </p>
- <p>These constants allow the <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var>, <var class="var">h</var> and <var class="var">t</var> expressions to refer to
- each other, so you may for example specify <code class="code">y=x/dar</code> or <code class="code">h=w/dar</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-114"></a>
- <h4 class="subsection">39.74.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-114" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-114" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Draw a grid with cell 100x100 pixels, thickness 2 pixels, with color red and an opacity of 50%:
- <div class="example">
- <pre class="example-preformatted">drawgrid=width=100:height=100:thickness=2:color=red@0.5
- </pre></div>
- </li><li>Draw a white 3x3 grid with an opacity of 50%:
- <div class="example">
- <pre class="example-preformatted">drawgrid=w=iw/3:h=ih/3:t=2:c=white@0.5
- </pre></div>
- </li></ul>
- <a name="Commands-87"></a>
- <h4 class="subsection">39.74.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-87" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-87" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same commands as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a class="anchor" id="drawtext"></a><a name="drawtext-1"></a>
- <h3 class="section">39.75 drawtext<span class="pull-right"><a class="anchor hidden-xs" href="#drawtext-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drawtext-1" aria-hidden="true">TOC</a></span></h3>
- <p>Draw a text string or text from a specified file on top of a video, using the
- libfreetype library.
- </p>
- <p>To enable compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-libfreetype</code> and <code class="code">--enable-libharfbuzz</code>.
- To enable default font fallback and the <var class="var">font</var> option you need to
- configure FFmpeg with <code class="code">--enable-libfontconfig</code>.
- To enable the <var class="var">text_shaping</var> option, you need to configure FFmpeg with
- <code class="code">--enable-libfribidi</code>.
- </p>
- <a name="Syntax-2"></a>
- <h4 class="subsection">39.75.1 Syntax<span class="pull-right"><a class="anchor hidden-xs" href="#Syntax-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Syntax-2" aria-hidden="true">TOC</a></span></h4>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">box</samp></dt>
- <dd><p>Used to draw a box around text using the background color.
- The value must be either 1 (enable) or 0 (disable).
- The default value of <var class="var">box</var> is 0.
- </p>
- </dd>
- <dt><samp class="option">boxborderw</samp></dt>
- <dd><p>Set the width of the border to be drawn around the box using <var class="var">boxcolor</var>.
- The value must be specified using one of the following formats:
- </p><ul class="itemize mark-bullet">
- <li><code class="code">boxborderw=10</code> set the width of all the borders to 10
- </li><li><code class="code">boxborderw=10|20</code> set the width of the top and bottom borders to 10
- and the width of the left and right borders to 20
- </li><li><code class="code">boxborderw=10|20|30</code> set the width of the top border to 10, the width
- of the bottom border to 30 and the width of the left and right borders to 20
- </li><li><code class="code">boxborderw=10|20|30|40</code> set the borders width to 10 (top), 20 (right),
- 30 (bottom), 40 (left)
- </li></ul>
- <p>The default value of <var class="var">boxborderw</var> is "0".
- </p>
- </dd>
- <dt><samp class="option">boxcolor</samp></dt>
- <dd><p>The color to be used for drawing box around text. For the syntax of this
- option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- </p>
- <p>The default value of <var class="var">boxcolor</var> is "white".
- </p>
- </dd>
- <dt><samp class="option">line_spacing</samp></dt>
- <dd><p>Set the line spacing in pixels. The default value of <var class="var">line_spacing</var> is 0.
- </p>
- </dd>
- <dt><samp class="option">text_align</samp></dt>
- <dd><p>Set the vertical and horizontal alignment of the text with respect to the box boundaries.
- The value is combination of flags, one for the vertical alignment (T=top,
- M=middle, B=bottom) and one for the horizontal alignment (L=left, C=center, R=right).
- Please note that tab characters are only supported with the left horizontal alignment.
- </p>
- </dd>
- <dt><samp class="option">y_align</samp></dt>
- <dd><p>Specify what the <var class="var">y</var> value is referred to. Possible values are:
- </p><ul class="itemize mark-bullet">
- <li><code class="code">text</code> the top of the highest glyph of the first text line is placed at <var class="var">y</var>
- </li><li><code class="code">baseline</code> the baseline of the first text line is placed at <var class="var">y</var>
- </li><li><code class="code">font</code> the baseline of the first text line is placed at <var class="var">y</var> plus the
- ascent (in pixels) defined in the font metrics
- </li></ul>
- <p>The default value of <var class="var">y_align</var> is "text" for backward compatibility.
- </p>
- </dd>
- <dt><samp class="option">borderw</samp></dt>
- <dd><p>Set the width of the border to be drawn around the text using <var class="var">bordercolor</var>.
- The default value of <var class="var">borderw</var> is 0.
- </p>
- </dd>
- <dt><samp class="option">bordercolor</samp></dt>
- <dd><p>Set the color to be used for drawing border around text. For the syntax of this
- option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- </p>
- <p>The default value of <var class="var">bordercolor</var> is "black".
- </p>
- </dd>
- <dt><samp class="option">expansion</samp></dt>
- <dd><p>Select how the <var class="var">text</var> is expanded. Can be either <code class="code">none</code>,
- <code class="code">strftime</code> (deprecated) or <code class="code">normal</code> (default). See the
- <a class="ref" href="#drawtext_005fexpansion">Text expansion</a> section below for details.
- </p>
- </dd>
- <dt><samp class="option">basetime</samp></dt>
- <dd><p>Set a start time for the count. Value is in microseconds. Only applied
- in the deprecated <code class="code">strftime</code> expansion mode. To emulate in normal expansion
- mode use the <code class="code">pts</code> function, supplying the start time (in seconds)
- as the second argument.
- </p>
- </dd>
- <dt><samp class="option">fix_bounds</samp></dt>
- <dd><p>If true, check and fix text coords to avoid clipping.
- </p>
- </dd>
- <dt><samp class="option">fontcolor</samp></dt>
- <dd><p>The color to be used for drawing fonts. For the syntax of this option, check
- the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- </p>
- <p>The default value of <var class="var">fontcolor</var> is "black".
- </p>
- </dd>
- <dt><samp class="option">fontcolor_expr</samp></dt>
- <dd><p>String which is expanded the same way as <var class="var">text</var> to obtain dynamic
- <var class="var">fontcolor</var> value. By default this option has empty value and is not
- processed. When this option is set, it overrides <var class="var">fontcolor</var> option.
- </p>
- </dd>
- <dt><samp class="option">font</samp></dt>
- <dd><p>The font family to be used for drawing text. By default Sans.
- </p>
- </dd>
- <dt><samp class="option">fontfile</samp></dt>
- <dd><p>The font file to be used for drawing text. The path must be included.
- This parameter is mandatory if the fontconfig support is disabled.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>Draw the text applying alpha blending. The value can
- be a number between 0.0 and 1.0.
- The expression accepts the same variables <var class="var">x, y</var> as well.
- The default value is 1.
- Please see <var class="var">fontcolor_expr</var>.
- </p>
- </dd>
- <dt><samp class="option">fontsize</samp></dt>
- <dd><p>The font size to be used for drawing text.
- The default value of <var class="var">fontsize</var> is 16.
- </p>
- </dd>
- <dt><samp class="option">text_shaping</samp></dt>
- <dd><p>If set to 1, attempt to shape the text (for example, reverse the order of
- right-to-left text and join Arabic characters) before drawing it.
- Otherwise, just draw the text exactly as given.
- By default 1 (if supported).
- </p>
- </dd>
- <dt><samp class="option">ft_load_flags</samp></dt>
- <dd><p>The flags to be used for loading the fonts.
- </p>
- <p>The flags map the corresponding flags supported by libfreetype, and are
- a combination of the following values:
- </p><dl class="table">
- <dt><var class="var">default</var></dt>
- <dt><var class="var">no_scale</var></dt>
- <dt><var class="var">no_hinting</var></dt>
- <dt><var class="var">render</var></dt>
- <dt><var class="var">no_bitmap</var></dt>
- <dt><var class="var">vertical_layout</var></dt>
- <dt><var class="var">force_autohint</var></dt>
- <dt><var class="var">crop_bitmap</var></dt>
- <dt><var class="var">pedantic</var></dt>
- <dt><var class="var">ignore_global_advance_width</var></dt>
- <dt><var class="var">no_recurse</var></dt>
- <dt><var class="var">ignore_transform</var></dt>
- <dt><var class="var">monochrome</var></dt>
- <dt><var class="var">linear_design</var></dt>
- <dt><var class="var">no_autohint</var></dt>
- </dl>
- <p>Default value is "default".
- </p>
- <p>For more information consult the documentation for the FT_LOAD_*
- libfreetype flags.
- </p>
- </dd>
- <dt><samp class="option">shadowcolor</samp></dt>
- <dd><p>The color to be used for drawing a shadow behind the drawn text. For the
- syntax of this option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the
- ffmpeg-utils manual</a>.
- </p>
- <p>The default value of <var class="var">shadowcolor</var> is "black".
- </p>
- </dd>
- <dt><samp class="option">boxw</samp></dt>
- <dd><p>Set the width of the box to be drawn around text.
- The default value of <var class="var">boxw</var> is computed automatically to match the text width
- </p>
- </dd>
- <dt><samp class="option">boxh</samp></dt>
- <dd><p>Set the height of the box to be drawn around text.
- The default value of <var class="var">boxh</var> is computed automatically to match the text height
- </p>
- </dd>
- <dt><samp class="option">shadowx</samp></dt>
- <dt><samp class="option">shadowy</samp></dt>
- <dd><p>The x and y offsets for the text shadow position with respect to the
- position of the text. They can be either positive or negative
- values. The default value for both is "0".
- </p>
- </dd>
- <dt><samp class="option">start_number</samp></dt>
- <dd><p>The starting frame number for the n/frame_num variable. The default value
- is "0".
- </p>
- </dd>
- <dt><samp class="option">tabsize</samp></dt>
- <dd><p>The size in number of spaces to use for rendering the tab.
- Default value is 4.
- </p>
- </dd>
- <dt><samp class="option">timecode</samp></dt>
- <dd><p>Set the initial timecode representation in "hh:mm:ss[:;.]ff"
- format. It can be used with or without text parameter. <var class="var">timecode_rate</var>
- option must be specified.
- </p>
- </dd>
- <dt><samp class="option">timecode_rate, rate, r</samp></dt>
- <dd><p>Set the timecode frame rate (timecode only). Value will be rounded to nearest
- integer. Minimum value is "1".
- Drop-frame timecode is supported for frame rates 30 & 60.
- </p>
- </dd>
- <dt><samp class="option">tc24hmax</samp></dt>
- <dd><p>If set to 1, the output of the timecode option will wrap around at 24 hours.
- Default is 0 (disabled).
- </p>
- </dd>
- <dt><samp class="option">text</samp></dt>
- <dd><p>The text string to be drawn. The text must be a sequence of UTF-8
- encoded characters.
- This parameter is mandatory if no file is specified with the parameter
- <var class="var">textfile</var>.
- </p>
- </dd>
- <dt><samp class="option">textfile</samp></dt>
- <dd><p>A text file containing text to be drawn. The text must be a sequence
- of UTF-8 encoded characters.
- </p>
- <p>This parameter is mandatory if no text string is specified with the
- parameter <var class="var">text</var>.
- </p>
- <p>If both <var class="var">text</var> and <var class="var">textfile</var> are specified, an error is thrown.
- </p>
- </dd>
- <dt><samp class="option">text_source</samp></dt>
- <dd><p>Text source should be set as side_data_detection_bboxes if you want to use text data in
- detection bboxes of side data.
- </p>
- <p>If text source is set, <var class="var">text</var> and <var class="var">textfile</var> will be ignored and still use
- text data in detection bboxes of side data. So please do not use this parameter
- if you are not sure about the text source.
- </p>
- </dd>
- <dt><samp class="option">reload</samp></dt>
- <dd><p>The <var class="var">textfile</var> will be reloaded at specified frame interval.
- Be sure to update <var class="var">textfile</var> atomically, or it may be read partially,
- or even fail.
- Range is 0 to INT_MAX. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The expressions which specify the offsets where text will be drawn
- within the video frame. They are relative to the top/left border of the
- output image.
- </p>
- <p>The default value of <var class="var">x</var> and <var class="var">y</var> is "0".
- </p>
- <p>See below for the list of accepted constants and functions.
- </p></dd>
- </dl>
- <p>The parameters for <var class="var">x</var> and <var class="var">y</var> are expressions containing the
- following constants and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">w</var> / <var class="var">h</var>) * <var class="var">sar</var>
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">line_h, lh</samp></dt>
- <dd><p>the height of each text line
- </p>
- </dd>
- <dt><samp class="option">main_h, h, H</samp></dt>
- <dd><p>the input height
- </p>
- </dd>
- <dt><samp class="option">main_w, w, W</samp></dt>
- <dd><p>the input width
- </p>
- </dd>
- <dt><samp class="option">max_glyph_a, ascent</samp></dt>
- <dd><p>the maximum distance from the baseline to the highest/upper grid
- coordinate used to place a glyph outline point, for all the rendered
- glyphs.
- It is a positive value, due to the grid’s orientation with the Y axis
- upwards.
- </p>
- </dd>
- <dt><samp class="option">max_glyph_d, descent</samp></dt>
- <dd><p>the maximum distance from the baseline to the lowest grid coordinate
- used to place a glyph outline point, for all the rendered glyphs.
- This is a negative value, due to the grid’s orientation, with the Y axis
- upwards.
- </p>
- </dd>
- <dt><samp class="option">max_glyph_h</samp></dt>
- <dd><p>maximum glyph height, that is the maximum height for all the glyphs
- contained in the rendered text, it is equivalent to <var class="var">ascent</var> -
- <var class="var">descent</var>.
- </p>
- </dd>
- <dt><samp class="option">max_glyph_w</samp></dt>
- <dd><p>maximum glyph width, that is the maximum width for all the glyphs
- contained in the rendered text
- </p>
- </dd>
- <dt><samp class="option">font_a</samp></dt>
- <dd><p>the ascent size defined in the font metrics
- </p>
- </dd>
- <dt><samp class="option">font_d</samp></dt>
- <dd><p>the descent size defined in the font metrics
- </p>
- </dd>
- <dt><samp class="option">top_a</samp></dt>
- <dd><p>the maximum ascender of the glyphs of the first text line
- </p>
- </dd>
- <dt><samp class="option">bottom_d</samp></dt>
- <dd><p>the maximum descender of the glyphs of the last text line
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>the number of input frame, starting from 0
- </p>
- </dd>
- <dt><samp class="option">rand(min, max)</samp></dt>
- <dd><p>return a random number included between <var class="var">min</var> and <var class="var">max</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>The input sample aspect ratio.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>timestamp expressed in seconds, NAN if the input timestamp is unknown
- </p>
- </dd>
- <dt><samp class="option">text_h, th</samp></dt>
- <dd><p>the height of the rendered text
- </p>
- </dd>
- <dt><samp class="option">text_w, tw</samp></dt>
- <dd><p>the width of the rendered text
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>the x and y offset coordinates where the text is drawn.
- </p>
- <p>These parameters allow the <var class="var">x</var> and <var class="var">y</var> expressions to refer
- to each other, so you can for example specify <code class="code">y=x/dar</code>.
- </p>
- </dd>
- <dt><samp class="option">pict_type</samp></dt>
- <dd><p>A one character description of the current frame’s picture type.
- </p>
- </dd>
- <dt><samp class="option">pkt_pos</samp></dt>
- <dd><p>The current packet’s position in the input file or stream
- (in bytes, from the start of the input). A value of -1 indicates
- this info is not available.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>The current packet’s duration, in seconds.
- </p>
- </dd>
- <dt><samp class="option">pkt_size</samp></dt>
- <dd><p>The current packet’s size (in bytes).
- </p></dd>
- </dl>
- <a class="anchor" id="drawtext_005fexpansion"></a><a name="Text-expansion"></a>
- <h4 class="subsection">39.75.2 Text expansion<span class="pull-right"><a class="anchor hidden-xs" href="#Text-expansion" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Text-expansion" aria-hidden="true">TOC</a></span></h4>
- <p>If <samp class="option">expansion</samp> is set to <code class="code">strftime</code>, the filter recognizes
- sequences accepted by the <code class="code">strftime</code> C function in the provided
- text and expands them accordingly. Check the documentation of
- <code class="code">strftime</code>. This feature is deprecated in favor of <code class="code">normal</code>
- expansion with the <code class="code">gmtime</code> or <code class="code">localtime</code> expansion
- functions.
- </p>
- <p>If <samp class="option">expansion</samp> is set to <code class="code">none</code>, the text is printed verbatim.
- </p>
- <p>If <samp class="option">expansion</samp> is set to <code class="code">normal</code> (which is the default),
- the following expansion mechanism is used.
- </p>
- <p>The backslash character ‘<samp class="samp">\</samp>’, followed by any character, always expands to
- the second character.
- </p>
- <p>Sequences of the form <code class="code">%{...}</code> are expanded. The text between the
- braces is a function name, possibly followed by arguments separated by ’:’.
- If the arguments contain special characters or delimiters (’:’ or ’}’),
- they should be escaped.
- </p>
- <p>Note that they probably must also be escaped as the value for the <samp class="option">text</samp>
- option in the filter argument string and as the filter argument in the
- filtergraph description, and possibly also for the shell, that makes up to four
- levels of escaping; using a text file with the <samp class="option">textfile</samp> option avoids
- these problems.
- </p>
- <p>The following functions are available:
- </p>
- <dl class="table">
- <dt><code class="command">expr, e</code></dt>
- <dd><p>The expression evaluation result.
- </p>
- <p>It must take one argument specifying the expression to be evaluated,
- which accepts the same constants and functions as the <var class="var">x</var> and
- <var class="var">y</var> values. Note that not all constants should be used, for
- example the text size is not known when evaluating the expression, so
- the constants <var class="var">text_w</var> and <var class="var">text_h</var> will have an undefined
- value.
- </p>
- </dd>
- <dt><code class="command">expr_int_format, eif</code></dt>
- <dd><p>Evaluate the expression’s value and output as formatted integer.
- </p>
- <p>The first argument is the expression to be evaluated, just as for the <var class="var">expr</var> function.
- The second argument specifies the output format. Allowed values are ‘<samp class="samp">x</samp>’,
- ‘<samp class="samp">X</samp>’, ‘<samp class="samp">d</samp>’ and ‘<samp class="samp">u</samp>’. They are treated exactly as in the
- <code class="code">printf</code> function.
- The third parameter is optional and sets the number of positions taken by the output.
- It can be used to add padding with zeros from the left.
- </p>
- </dd>
- <dt><code class="command">gmtime</code></dt>
- <dd><p>The time at which the filter is running, expressed in UTC.
- It can accept an argument: a <code class="code">strftime</code> C function format string.
- The format string is extended to support the variable <var class="var">%[1-6]N</var>
- which prints fractions of the second with optionally specified number of digits.
- </p>
- </dd>
- <dt><code class="command">localtime</code></dt>
- <dd><p>The time at which the filter is running, expressed in the local time zone.
- It can accept an argument: a <code class="code">strftime</code> C function format string.
- The format string is extended to support the variable <var class="var">%[1-6]N</var>
- which prints fractions of the second with optionally specified number of digits.
- </p>
- </dd>
- <dt><code class="command">metadata</code></dt>
- <dd><p>Frame metadata. Takes one or two arguments.
- </p>
- <p>The first argument is mandatory and specifies the metadata key.
- </p>
- <p>The second argument is optional and specifies a default value, used when the
- metadata key is not found or empty.
- </p>
- <p>Available metadata can be identified by inspecting entries
- starting with TAG included within each frame section
- printed by running <code class="code">ffprobe -show_frames</code>.
- </p>
- <p>String metadata generated in filters leading to
- the drawtext filter are also available.
- </p>
- </dd>
- <dt><code class="command">n, frame_num</code></dt>
- <dd><p>The frame number, starting from 0.
- </p>
- </dd>
- <dt><code class="command">pict_type</code></dt>
- <dd><p>A one character description of the current picture type.
- </p>
- </dd>
- <dt><code class="command">pts</code></dt>
- <dd><p>The timestamp of the current frame.
- It can take up to three arguments.
- </p>
- <p>The first argument is the format of the timestamp; it defaults to <code class="code">flt</code>
- for seconds as a decimal number with microsecond accuracy; <code class="code">hms</code> stands
- for a formatted <var class="var">[-]HH:MM:SS.mmm</var> timestamp with millisecond accuracy.
- <code class="code">gmtime</code> stands for the timestamp of the frame formatted as UTC time;
- <code class="code">localtime</code> stands for the timestamp of the frame formatted as
- local time zone time.
- </p>
- <p>The second argument is an offset added to the timestamp.
- </p>
- <p>If the format is set to <code class="code">hms</code>, a third argument <code class="code">24HH</code> may be
- supplied to present the hour part of the formatted timestamp in 24h format
- (00-23).
- </p>
- <p>If the format is set to <code class="code">localtime</code> or <code class="code">gmtime</code>, a third
- argument may be supplied: a <code class="code">strftime</code> C function format string.
- By default, <var class="var">YYYY-MM-DD HH:MM:SS</var> format will be used.
- </p></dd>
- </dl>
- <a name="Commands-88"></a>
- <h4 class="subsection">39.75.3 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-88" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-88" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports altering parameters via commands:
- </p><dl class="table">
- <dt><samp class="option">reinit</samp></dt>
- <dd><p>Alter existing filter parameters.
- </p>
- <p>Syntax for the argument is the same as for filter invocation, e.g.
- </p>
- <div class="example">
- <pre class="example-preformatted">fontsize=56:fontcolor=green:text='Hello World'
- </pre></div>
- <p>Full filter invocation with sendcmd would look like this:
- </p>
- <div class="example">
- <pre class="example-preformatted">sendcmd=c='56.0 drawtext reinit fontsize=56\:fontcolor=green\:text=Hello\\ World'
- </pre></div>
- <p>If the entire argument can’t be parsed or applied as valid values then the filter will
- continue with its existing parameters.
- </p>
- </dd>
- </dl>
- <p>The following options are also supported as <a class="ref" href="#commands">commands</a>:
- </p>
- <ul class="itemize mark-bullet">
- <li>x
- </li><li>y
- </li><li>alpha
- </li><li>fontsize
- </li><li>fontcolor
- </li><li>boxcolor
- </li><li>bordercolor
- </li><li>shadowcolor
- </li><li>box
- </li><li>boxw
- </li><li>boxh
- </li><li>boxborderw
- </li><li>line_spacing
- </li><li>text_align
- </li><li>shadowx
- </li><li>shadowy
- </li><li>borderw
- </li></ul>
- <a name="Examples-115"></a>
- <h4 class="subsection">39.75.4 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-115" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-115" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Draw "Test Text" with font FreeSerif, using the default values for the
- optional parameters.
- <div class="example">
- <pre class="example-preformatted">drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text'"
- </pre></div>
- </li><li>Draw ’Test Text’ with font FreeSerif of size 24 at position x=100
- and y=50 (counting from the top-left corner of the screen), text is
- yellow with a red box around it. Both the text and the box have an
- opacity of 20%.
- <div class="example">
- <pre class="example-preformatted">drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text':\
- x=100: y=50: fontsize=24: fontcolor=yellow@0.2: box=1: boxcolor=red@0.2"
- </pre></div>
- <p>Note that the double quotes are not necessary if spaces are not used
- within the parameter list.
- </p>
- </li><li>Show the text at the center of the video frame:
- <div class="example">
- <pre class="example-preformatted">drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=(w-text_w)/2:y=(h-text_h)/2"
- </pre></div>
- </li><li>Show the text at a random position, switching to a new position every 30 seconds:
- <div class="example">
- <pre class="example-preformatted">drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=if(eq(mod(t\,30)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,30)\,0)\,rand(0\,(h-text_h))\,y)"
- </pre></div>
- </li><li>Show a text line sliding from right to left in the last row of the video
- frame. The file <samp class="file">LONG_LINE</samp> is assumed to contain a single line
- with no newlines.
- <div class="example">
- <pre class="example-preformatted">drawtext="fontsize=15:fontfile=FreeSerif.ttf:text=LONG_LINE:y=h-line_h:x=-50*t"
- </pre></div>
- </li><li>Show the content of file <samp class="file">CREDITS</samp> off the bottom of the frame and scroll up.
- <div class="example">
- <pre class="example-preformatted">drawtext="fontsize=20:fontfile=FreeSerif.ttf:textfile=CREDITS:y=h-20*t"
- </pre></div>
- </li><li>Draw a single green letter "g", at the center of the input video.
- The glyph baseline is placed at half screen height.
- <div class="example">
- <pre class="example-preformatted">drawtext="fontsize=60:fontfile=FreeSerif.ttf:fontcolor=green:text=g:x=(w-max_glyph_w)/2:y=h/2-ascent"
- </pre></div>
- </li><li>Show text for 1 second every 3 seconds:
- <div class="example">
- <pre class="example-preformatted">drawtext="fontfile=FreeSerif.ttf:fontcolor=white:x=100:y=x/dar:enable=lt(mod(t\,3)\,1):text='blink'"
- </pre></div>
- </li><li>Use fontconfig to set the font. Note that the colons need to be escaped.
- <div class="example">
- <pre class="example-preformatted">drawtext='fontfile=Linux Libertine O-40\\:style=Semibold:text=FFmpeg'
- </pre></div>
- </li><li>Draw "Test Text" with font size dependent on height of the video.
- <div class="example">
- <pre class="example-preformatted">drawtext="text='Test Text': fontsize=h/30: x=(w-text_w)/2: y=(h-text_h*2)"
- </pre></div>
- </li><li>Print the date of a real-time encoding (see documentation for the
- <code class="code">strftime</code> C function):
- <div class="example">
- <pre class="example-preformatted">drawtext='fontfile=FreeSans.ttf:text=%{localtime\:%a %b %d %Y}'
- </pre></div>
- </li><li>Show text fading in and out (appearing/disappearing):
- <div class="example">
- <pre class="example-preformatted">#!/bin/sh
- DS=1.0 # display start
- DE=10.0 # display end
- FID=1.5 # fade in duration
- FOD=5 # fade out duration
- ffplay -f lavfi "color,drawtext=text=TEST:fontsize=50:fontfile=FreeSerif.ttf:fontcolor_expr=ff0000%{eif\\\\: clip(255*(1*between(t\\, $DS + $FID\\, $DE - $FOD) + ((t - $DS)/$FID)*between(t\\, $DS\\, $DS + $FID) + (-(t - $DE)/$FOD)*between(t\\, $DE - $FOD\\, $DE) )\\, 0\\, 255) \\\\: x\\\\: 2 }"
- </pre></div>
- </li><li>Horizontally align multiple separate texts. Note that <samp class="option">max_glyph_a</samp>
- and the <samp class="option">fontsize</samp> value are included in the <samp class="option">y</samp> offset.
- <div class="example">
- <pre class="example-preformatted">drawtext=fontfile=FreeSans.ttf:text=DOG:fontsize=24:x=10:y=20+24-max_glyph_a,
- drawtext=fontfile=FreeSans.ttf:text=cow:fontsize=24:x=80:y=20+24-max_glyph_a
- </pre></div>
- </li><li>Plot special <var class="var">lavf.image2dec.source_basename</var> metadata onto each frame if
- such metadata exists. Otherwise, plot the string "NA". Note that image2 demuxer
- must have option <samp class="option">-export_path_metadata 1</samp> for the special metadata fields
- to be available for filters.
- <div class="example">
- <pre class="example-preformatted">drawtext="fontsize=20:fontcolor=white:fontfile=FreeSans.ttf:text='%{metadata\:lavf.image2dec.source_basename\:NA}':x=10:y=10"
- </pre></div>
- </li></ul>
- <p>For more information about libfreetype, check:
- <a class="url" href="http://www.freetype.org/">http://www.freetype.org/</a>.
- </p>
- <p>For more information about fontconfig, check:
- <a class="url" href="http://freedesktop.org/software/fontconfig/fontconfig-user.html">http://freedesktop.org/software/fontconfig/fontconfig-user.html</a>.
- </p>
- <p>For more information about libfribidi, check:
- <a class="url" href="http://fribidi.org/">http://fribidi.org/</a>.
- </p>
- <p>For more information about libharfbuzz, check:
- <a class="url" href="https://github.com/harfbuzz/harfbuzz">https://github.com/harfbuzz/harfbuzz</a>.
- </p>
- <a class="anchor" id="drawvg"></a><a name="drawvg-1"></a>
- <h3 class="section">39.76 drawvg<span class="pull-right"><a class="anchor hidden-xs" href="#drawvg-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drawvg-1" aria-hidden="true">TOC</a></span></h3>
- <p>Draw vector graphics on top of video frames, by executing a script written in
- a custom language called VGS (<em class="emph">Vector Graphics Script</em>).
- </p>
- <p>The documentation for the language can be found in
- <a data-manual="drawvg-reference" href="drawvg-reference.html#Top">drawvg - Language Reference</a>. A version of this reference
- with rendered examples can be found at the
- <a class="uref" href="https://ayosec.github.io/ffmpeg-drawvg/playground/docs/langref.html">author’s site</a>.
- </p>
- <p>Graphics are rendered using the <a class="uref" href="https://cairographics.org/">cario 2D
- graphics library</a>.
- </p>
- <p>To enable compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-cairo</code>.
- </p>
- <a name="Parameters"></a>
- <h4 class="subsection">39.76.1 Parameters<span class="pull-right"><a class="anchor hidden-xs" href="#Parameters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Parameters" aria-hidden="true">TOC</a></span></h4>
- <p>Either <code class="code">script</code> or <code class="code">file</code> must be set.
- </p>
- <dl class="table">
- <dt><samp class="option">s, script</samp></dt>
- <dd><p>Script source to draw the graphics.
- </p>
- </dd>
- <dt><samp class="option">file</samp></dt>
- <dd><p>Path of the file to load the script source.
- </p>
- </dd>
- </dl>
- <a name="Pixel-Formats"></a>
- <h4 class="subsection">39.76.2 Pixel Formats<span class="pull-right"><a class="anchor hidden-xs" href="#Pixel-Formats" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Pixel-Formats" aria-hidden="true">TOC</a></span></h4>
- <p>Since Cairo only supports RGB images, if the input video is something else (like
- YUV 4:2:0), before executing the script the video is converted to a format
- compatible with Cairo. Then, you have to use either the <a class="ref" href="#format">format</a> filter,
- or the <code class="code">-pix_fmt</code> option, to convert it to the expected format in the
- output.
- </p>
- <a name="Examples-116"></a>
- <h4 class="subsection">39.76.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-116" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-116" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Draw the outline of an ellipse.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.webm \
- -vf 'drawvg=ellipse (w/2) (h/2) (w/3) (h/3) stroke' \
- -pix_fmt yuv420p \
- output.webm
- </pre></div>
- </li><li>
- Draw a square rotating in the middle of the frame.
- <p>The script for drawvg is in a file <code class="code">draw.vgs</code>:
- </p>
- <div class="example">
- <pre class="example-preformatted">translate (w/2) (h/2)
- rotate t
- rect -100 -100 200 200
- setcolor red@0.5
- fill
- </pre></div>
- <p>Then:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.webm -vf 'drawvg=file=draw.vgs,format=yuv420p' output.webm
- </pre></div>
- </li></ul>
- <a name="edgedetect"></a>
- <h3 class="section">39.77 edgedetect<span class="pull-right"><a class="anchor hidden-xs" href="#edgedetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-edgedetect" aria-hidden="true">TOC</a></span></h3>
- <p>Detect and draw edges. The filter uses the Canny Edge Detection algorithm.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">low</samp></dt>
- <dt><samp class="option">high</samp></dt>
- <dd><p>Set low and high threshold values used by the Canny thresholding
- algorithm.
- </p>
- <p>The high threshold selects the "strong" edge pixels, which are then
- connected through 8-connectivity with the "weak" edge pixels selected
- by the low threshold.
- </p>
- <p><var class="var">low</var> and <var class="var">high</var> threshold values must be chosen in the range
- [0,1], and <var class="var">low</var> should be lesser or equal to <var class="var">high</var>.
- </p>
- <p>Default value for <var class="var">low</var> is <code class="code">20/255</code>, and default value for <var class="var">high</var>
- is <code class="code">50/255</code>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Define the drawing mode.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">wires</samp>’</dt>
- <dd><p>Draw white/gray wires on black background.
- </p>
- </dd>
- <dt>‘<samp class="samp">colormix</samp>’</dt>
- <dd><p>Mix the colors to create a paint/cartoon effect.
- </p>
- </dd>
- <dt>‘<samp class="samp">canny</samp>’</dt>
- <dd><p>Apply Canny edge detector on all selected planes.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">wires</var>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Select planes for filtering. By default all available planes are filtered.
- </p></dd>
- </dl>
- <a name="Examples-117"></a>
- <h4 class="subsection">39.77.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-117" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-117" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Standard edge detection with custom values for the hysteresis thresholding:
- <div class="example">
- <pre class="example-preformatted">edgedetect=low=0.1:high=0.4
- </pre></div>
- </li><li>Painting effect without thresholding:
- <div class="example">
- <pre class="example-preformatted">edgedetect=mode=colormix:high=0
- </pre></div>
- </li></ul>
- <a name="elbg"></a>
- <h3 class="section">39.78 elbg<span class="pull-right"><a class="anchor hidden-xs" href="#elbg" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-elbg" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a posterize effect using the ELBG (Enhanced LBG) algorithm.
- </p>
- <p>For each input image, the filter will compute the optimal mapping from
- the input to the output given the codebook length, that is the number
- of distinct output colors.
- </p>
- <p>This filter accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">codebook_length, l</samp></dt>
- <dd><p>Set codebook length. The value must be a positive integer, and
- represents the number of distinct output colors. Default value is 256.
- </p>
- </dd>
- <dt><samp class="option">nb_steps, n</samp></dt>
- <dd><p>Set the maximum number of iterations to apply for computing the optimal
- mapping. The higher the value the better the result and the higher the
- computation time. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">seed, s</samp></dt>
- <dd><p>Set a random seed, must be an integer included between 0 and
- UINT32_MAX. If not specified, or if explicitly set to -1, the filter
- will try to use a good random seed on a best effort basis.
- </p>
- </dd>
- <dt><samp class="option">pal8</samp></dt>
- <dd><p>Set pal8 output pixel format. This option does not work with codebook
- length greater than 256. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">use_alpha</samp></dt>
- <dd><p>Include alpha values in the quantization calculation. Allows creating
- palettized output images (e.g. PNG8) with multiple alpha smooth blending.
- </p></dd>
- </dl>
- <a name="entropy"></a>
- <h3 class="section">39.79 entropy<span class="pull-right"><a class="anchor hidden-xs" href="#entropy" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-entropy" aria-hidden="true">TOC</a></span></h3>
- <p>Measure graylevel entropy in histogram of color channels of video frames.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Can be either <var class="var">normal</var> or <var class="var">diff</var>. Default is <var class="var">normal</var>.
- </p>
- <p><var class="var">diff</var> mode measures entropy of histogram delta values, absolute differences
- between neighbour histogram values.
- </p></dd>
- </dl>
- <a name="epx"></a>
- <h3 class="section">39.80 epx<span class="pull-right"><a class="anchor hidden-xs" href="#epx" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-epx" aria-hidden="true">TOC</a></span></h3>
- <p>Apply the EPX magnification filter which is designed for pixel art.
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the scaling dimension: <code class="code">2</code> for <code class="code">2xEPX</code>, <code class="code">3</code> for
- <code class="code">3xEPX</code>.
- Default is <code class="code">3</code>.
- </p></dd>
- </dl>
- <a name="eq"></a>
- <h3 class="section">39.81 eq<span class="pull-right"><a class="anchor hidden-xs" href="#eq" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-eq" aria-hidden="true">TOC</a></span></h3>
- <p>Set brightness, contrast, saturation and approximate gamma adjustment.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">contrast</samp></dt>
- <dd><p>Set the contrast expression. The value must be a float value in range
- <code class="code">-1000.0</code> to <code class="code">1000.0</code>. The default value is "1".
- </p>
- </dd>
- <dt><samp class="option">brightness</samp></dt>
- <dd><p>Set the brightness expression. The value must be a float value in
- range <code class="code">-1.0</code> to <code class="code">1.0</code>. The default value is "0".
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set the saturation expression. The value must be a float in
- range <code class="code">0.0</code> to <code class="code">3.0</code>. The default value is "1".
- </p>
- </dd>
- <dt><samp class="option">gamma</samp></dt>
- <dd><p>Set the gamma expression. The value must be a float in range
- <code class="code">0.1</code> to <code class="code">10.0</code>. The default value is "1".
- </p>
- </dd>
- <dt><samp class="option">gamma_r</samp></dt>
- <dd><p>Set the gamma expression for red. The value must be a float in
- range <code class="code">0.1</code> to <code class="code">10.0</code>. The default value is "1".
- </p>
- </dd>
- <dt><samp class="option">gamma_g</samp></dt>
- <dd><p>Set the gamma expression for green. The value must be a float in range
- <code class="code">0.1</code> to <code class="code">10.0</code>. The default value is "1".
- </p>
- </dd>
- <dt><samp class="option">gamma_b</samp></dt>
- <dd><p>Set the gamma expression for blue. The value must be a float in range
- <code class="code">0.1</code> to <code class="code">10.0</code>. The default value is "1".
- </p>
- </dd>
- <dt><samp class="option">gamma_weight</samp></dt>
- <dd><p>Set the gamma weight expression. It can be used to reduce the effect
- of a high gamma value on bright image areas, e.g. keep them from
- getting overamplified and just plain white. The value must be a float
- in range <code class="code">0.0</code> to <code class="code">1.0</code>. A value of <code class="code">0.0</code> turns the
- gamma correction all the way down while <code class="code">1.0</code> leaves it at its
- full strength. Default is "1".
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set when the expressions for brightness, contrast, saturation and
- gamma expressions are evaluated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>only evaluate expressions once during the filter initialization or
- when a command is processed
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>evaluate expressions for each incoming frame
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">init</samp>’.
- </p></dd>
- </dl>
- <p>The expressions accept the following parameters:
- </p><dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>frame count of the input frame starting from 0
- </p>
- </dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>byte position of the corresponding packet in the input file, NAN if
- unspecified; deprecated, do not use
- </p>
- </dd>
- <dt><samp class="option">r</samp></dt>
- <dd><p>frame rate of the input video, NAN if the input frame rate is unknown
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>timestamp expressed in seconds, NAN if the input timestamp is unknown
- </p></dd>
- </dl>
- <a name="Commands-89"></a>
- <h4 class="subsection">39.81.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-89" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-89" aria-hidden="true">TOC</a></span></h4>
- <p>The filter supports the following commands:
- </p>
- <dl class="table">
- <dt><samp class="option">contrast</samp></dt>
- <dd><p>Set the contrast expression.
- </p>
- </dd>
- <dt><samp class="option">brightness</samp></dt>
- <dd><p>Set the brightness expression.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set the saturation expression.
- </p>
- </dd>
- <dt><samp class="option">gamma</samp></dt>
- <dd><p>Set the gamma expression.
- </p>
- </dd>
- <dt><samp class="option">gamma_r</samp></dt>
- <dd><p>Set the gamma_r expression.
- </p>
- </dd>
- <dt><samp class="option">gamma_g</samp></dt>
- <dd><p>Set gamma_g expression.
- </p>
- </dd>
- <dt><samp class="option">gamma_b</samp></dt>
- <dd><p>Set gamma_b expression.
- </p>
- </dd>
- <dt><samp class="option">gamma_weight</samp></dt>
- <dd><p>Set gamma_weight expression.
- </p>
- <p>The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- </dd>
- </dl>
- <a class="anchor" id="erosion"></a><a name="erosion-1"></a>
- <h3 class="section">39.82 erosion<span class="pull-right"><a class="anchor hidden-xs" href="#erosion-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-erosion-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply erosion effect to the video.
- </p>
- <p>This filter replaces the pixel by the local(3x3) minimum.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold0</samp></dt>
- <dt><samp class="option">threshold1</samp></dt>
- <dt><samp class="option">threshold2</samp></dt>
- <dt><samp class="option">threshold3</samp></dt>
- <dd><p>Limit the maximum change for each plane, default is 65535.
- If 0, plane will remain unchanged.
- </p>
- </dd>
- <dt><samp class="option">coordinates</samp></dt>
- <dd><p>Flag which specifies the pixel to refer to. Default is 255 i.e. all eight
- pixels are used.
- </p>
- <p>Flags to local 3x3 coordinates maps like this:
- </p>
- <p>1 2 3
- 4 5
- 6 7 8
- </p></dd>
- </dl>
- <a name="Commands-90"></a>
- <h4 class="subsection">39.82.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-90" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-90" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="estdif"></a>
- <h3 class="section">39.83 estdif<span class="pull-right"><a class="anchor hidden-xs" href="#estdif" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-estdif" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlace the input video ("estdif" stands for "Edge Slope
- Tracing Deinterlacing Filter").
- </p>
- <p>Spatial only filter that uses edge slope tracing algorithm
- to interpolate missing lines.
- It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">field</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following
- values:
- </p>
- <dl class="table">
- <dt><samp class="option">all</samp></dt>
- <dd><p>Deinterlace all frames.
- </p></dd>
- <dt><samp class="option">interlaced</samp></dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">all</code>.
- </p>
- </dd>
- <dt><samp class="option">rslope</samp></dt>
- <dd><p>Specify the search radius for edge slope tracing. Default value is 1.
- Allowed range is from 1 to 15.
- </p>
- </dd>
- <dt><samp class="option">redge</samp></dt>
- <dd><p>Specify the search radius for best edge matching. Default value is 2.
- Allowed range is from 0 to 15.
- </p>
- </dd>
- <dt><samp class="option">ecost</samp></dt>
- <dd><p>Specify the edge cost for edge matching. Default value is 2.
- Allowed range is from 0 to 50.
- </p>
- </dd>
- <dt><samp class="option">mcost</samp></dt>
- <dd><p>Specify the middle cost for edge matching. Default value is 1.
- Allowed range is from 0 to 50.
- </p>
- </dd>
- <dt><samp class="option">dcost</samp></dt>
- <dd><p>Specify the distance cost for edge matching. Default value is 1.
- Allowed range is from 0 to 50.
- </p>
- </dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Specify the interpolation used. Default is 4-point interpolation. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">2p</samp></dt>
- <dd><p>Two-point interpolation.
- </p></dd>
- <dt><samp class="option">4p</samp></dt>
- <dd><p>Four-point interpolation.
- </p></dd>
- <dt><samp class="option">6p</samp></dt>
- <dd><p>Six-point interpolation.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-91"></a>
- <h4 class="subsection">39.83.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-91" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-91" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="exposure"></a>
- <h3 class="section">39.84 exposure<span class="pull-right"><a class="anchor hidden-xs" href="#exposure" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-exposure" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust exposure of the video stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">exposure</samp></dt>
- <dd><p>Set the exposure correction in EV. Allowed range is from -3.0 to 3.0 EV
- Default value is 0 EV.
- </p>
- </dd>
- <dt><samp class="option">black</samp></dt>
- <dd><p>Set the black level correction. Allowed range is from -1.0 to 1.0.
- Default value is 0.
- </p></dd>
- </dl>
- <a name="Commands-92"></a>
- <h4 class="subsection">39.84.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-92" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-92" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="extractplanes"></a>
- <h3 class="section">39.85 extractplanes<span class="pull-right"><a class="anchor hidden-xs" href="#extractplanes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-extractplanes" aria-hidden="true">TOC</a></span></h3>
- <p>Extract color channel components from input video stream into
- separate grayscale video streams.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set plane(s) to extract.
- </p>
- <p>Available values for planes are:
- </p><dl class="table">
- <dt>‘<samp class="samp">y</samp>’</dt>
- <dt>‘<samp class="samp">u</samp>’</dt>
- <dt>‘<samp class="samp">v</samp>’</dt>
- <dt>‘<samp class="samp">a</samp>’</dt>
- <dt>‘<samp class="samp">r</samp>’</dt>
- <dt>‘<samp class="samp">g</samp>’</dt>
- <dt>‘<samp class="samp">b</samp>’</dt>
- </dl>
- <p>Choosing planes not available in the input will result in an error.
- That means you cannot select <code class="code">r</code>, <code class="code">g</code>, <code class="code">b</code> planes
- with <code class="code">y</code>, <code class="code">u</code>, <code class="code">v</code> planes at same time.
- </p></dd>
- </dl>
- <a name="Examples-118"></a>
- <h4 class="subsection">39.85.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-118" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-118" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Extract luma, u and v color channel component from input video frame
- into 3 grayscale outputs:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i video.avi -filter_complex 'extractplanes=y+u+v[y][u][v]' -map '[y]' y.avi -map '[u]' u.avi -map '[v]' v.avi
- </pre></div>
- </li></ul>
- <a name="fade"></a>
- <h3 class="section">39.86 fade<span class="pull-right"><a class="anchor hidden-xs" href="#fade" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fade" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a fade-in/out effect to the input video.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">type, t</samp></dt>
- <dd><p>The effect type can be either "in" for a fade-in, or "out" for a fade-out
- effect.
- Default is <code class="code">in</code>.
- </p>
- </dd>
- <dt><samp class="option">start_frame, s</samp></dt>
- <dd><p>Specify the number of the frame to start applying the fade
- effect at. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">nb_frames, n</samp></dt>
- <dd><p>The number of frames that the fade effect lasts. At the end of the
- fade-in effect, the output video will have the same intensity as the input video.
- At the end of the fade-out transition, the output video will be filled with the
- selected <samp class="option">color</samp>.
- Default is 25.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>If set to 1, fade only alpha channel, if one exists on the input.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">start_time, st</samp></dt>
- <dd><p>Specify the timestamp (in seconds) of the frame to start to apply the fade
- effect. If both start_frame and start_time are specified, the fade will start at
- whichever comes last. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>The number of seconds for which the fade effect has to last. At the end of the
- fade-in effect the output video will have the same intensity as the input video,
- at the end of the fade-out transition the output video will be filled with the
- selected <samp class="option">color</samp>.
- If both duration and nb_frames are specified, duration is used. Default is 0
- (nb_frames is used by default).
- </p>
- </dd>
- <dt><samp class="option">color, c</samp></dt>
- <dd><p>Specify the color of the fade. Default is "black".
- </p></dd>
- </dl>
- <a name="Examples-119"></a>
- <h4 class="subsection">39.86.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-119" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-119" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Fade in the first 30 frames of video:
- <div class="example">
- <pre class="example-preformatted">fade=in:0:30
- </pre></div>
- <p>The command above is equivalent to:
- </p><div class="example">
- <pre class="example-preformatted">fade=t=in:s=0:n=30
- </pre></div>
- </li><li>Fade out the last 45 frames of a 200-frame video:
- <div class="example">
- <pre class="example-preformatted">fade=out:155:45
- fade=type=out:start_frame=155:nb_frames=45
- </pre></div>
- </li><li>Fade in the first 25 frames and fade out the last 25 frames of a 1000-frame video:
- <div class="example">
- <pre class="example-preformatted">fade=in:0:25, fade=out:975:25
- </pre></div>
- </li><li>Make the first 5 frames yellow, then fade in from frame 5-24:
- <div class="example">
- <pre class="example-preformatted">fade=in:5:20:color=yellow
- </pre></div>
- </li><li>Fade in alpha over first 25 frames of video:
- <div class="example">
- <pre class="example-preformatted">fade=in:0:25:alpha=1
- </pre></div>
- </li><li>Make the first 5.5 seconds black, then fade in for 0.5 seconds:
- <div class="example">
- <pre class="example-preformatted">fade=t=in:st=5.5:d=0.5
- </pre></div>
- </li></ul>
- <a name="feedback"></a>
- <h3 class="section">39.87 feedback<span class="pull-right"><a class="anchor hidden-xs" href="#feedback" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-feedback" aria-hidden="true">TOC</a></span></h3>
- <p>Apply feedback video filter.
- </p>
- <p>This filter pass cropped input frames to 2nd output.
- From there it can be filtered with other video filters.
- After filter receives frame from 2nd input, that frame
- is combined on top of original frame from 1st input and passed
- to 1st output.
- </p>
- <p>The typical usage is filter only part of frame.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set the top left crop position.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the crop size.
- </p></dd>
- </dl>
- <a name="Examples-120"></a>
- <h4 class="subsection">39.87.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-120" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-120" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Blur only top left rectangular part of video frame size 100x100 with gblur filter.
- <div class="example">
- <pre class="example-preformatted">[in][blurin]feedback=x=0:y=0:w=100:h=100[out][blurout];[blurout]gblur=8[blurin]
- </pre></div>
- </li><li>Draw black box on top left part of video frame of size 100x100 with drawbox filter.
- <div class="example">
- <pre class="example-preformatted">[in][blurin]feedback=x=0:y=0:w=100:h=100[out][blurout];[blurout]drawbox=x=0:y=0:w=100:h=100:t=100[blurin]
- </pre></div>
- </li><li>Pixelize rectangular part of video frame of size 100x100 with pixelize filter.
- <div class="example">
- <pre class="example-preformatted">[in][blurin]feedback=x=320:y=240:w=100:h=100[out][blurout];[blurout]pixelize[blurin]
- </pre></div>
- </li></ul>
- <a name="fftdnoiz"></a>
- <h3 class="section">39.88 fftdnoiz<span class="pull-right"><a class="anchor hidden-xs" href="#fftdnoiz" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fftdnoiz" aria-hidden="true">TOC</a></span></h3>
- <p>Denoise frames using 3D FFT (frequency domain filtering).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>Set the noise sigma constant. This sets denoising strength.
- Default value is 1. Allowed range is from 0 to 30.
- Using very high sigma with low overlap may give blocking artifacts.
- </p>
- </dd>
- <dt><samp class="option">amount</samp></dt>
- <dd><p>Set amount of denoising. By default all detected noise is reduced.
- Default value is 1. Allowed range is from 0 to 1.
- </p>
- </dd>
- <dt><samp class="option">block</samp></dt>
- <dd><p>Set size of block in pixels, Default is 32, can be 8 to 256.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set block overlap. Default is 0.5. Allowed range is from 0.2 to 0.8.
- </p>
- </dd>
- <dt><samp class="option">method</samp></dt>
- <dd><p>Set denoising method. Default is <code class="code">wiener</code>, can also be <code class="code">hard</code>.
- </p>
- </dd>
- <dt><samp class="option">prev</samp></dt>
- <dd><p>Set number of previous frames to use for denoising. By default is set to 0.
- </p>
- </dd>
- <dt><samp class="option">next</samp></dt>
- <dd><p>Set number of next frames to to use for denoising. By default is set to 0.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes which will be filtered, by default are all available filtered
- except alpha.
- </p></dd>
- </dl>
- <a name="fftfilt"></a>
- <h3 class="section">39.89 fftfilt<span class="pull-right"><a class="anchor hidden-xs" href="#fftfilt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fftfilt" aria-hidden="true">TOC</a></span></h3>
- <p>Apply arbitrary expressions to samples in frequency domain
- </p>
- <dl class="table">
- <dt><samp class="option">dc_Y</samp></dt>
- <dd><p>Adjust the dc value (gain) of the luma plane of the image. The filter
- accepts an integer value in range <code class="code">0</code> to <code class="code">1000</code>. The default
- value is set to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">dc_U</samp></dt>
- <dd><p>Adjust the dc value (gain) of the 1st chroma plane of the image. The
- filter accepts an integer value in range <code class="code">0</code> to <code class="code">1000</code>. The
- default value is set to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">dc_V</samp></dt>
- <dd><p>Adjust the dc value (gain) of the 2nd chroma plane of the image. The
- filter accepts an integer value in range <code class="code">0</code> to <code class="code">1000</code>. The
- default value is set to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">weight_Y</samp></dt>
- <dd><p>Set the frequency domain weight expression for the luma plane.
- </p>
- </dd>
- <dt><samp class="option">weight_U</samp></dt>
- <dd><p>Set the frequency domain weight expression for the 1st chroma plane.
- </p>
- </dd>
- <dt><samp class="option">weight_V</samp></dt>
- <dd><p>Set the frequency domain weight expression for the 2nd chroma plane.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set when the expressions are evaluated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>Only evaluate expressions once during the filter initialization.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Evaluate expressions for each incoming frame.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">init</samp>’.
- </p>
- <p>The filter accepts the following variables:
- </p></dd>
- <dt><samp class="option">X</samp></dt>
- <dt><samp class="option">Y</samp></dt>
- <dd><p>The coordinates of the current sample.
- </p>
- </dd>
- <dt><samp class="option">W</samp></dt>
- <dt><samp class="option">H</samp></dt>
- <dd><p>The width and height of the image.
- </p>
- </dd>
- <dt><samp class="option">N</samp></dt>
- <dd><p>The number of input frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">WS</samp></dt>
- <dt><samp class="option">HS</samp></dt>
- <dd><p>The size of FFT array for horizontal and vertical processing.
- </p></dd>
- </dl>
- <a name="Examples-121"></a>
- <h4 class="subsection">39.89.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-121" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-121" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>High-pass:
- <div class="example">
- <pre class="example-preformatted">fftfilt=dc_Y=128:weight_Y='squish(1-(Y+X)/100)'
- </pre></div>
- </li><li>Low-pass:
- <div class="example">
- <pre class="example-preformatted">fftfilt=dc_Y=0:weight_Y='squish((Y+X)/100-1)'
- </pre></div>
- </li><li>Sharpen:
- <div class="example">
- <pre class="example-preformatted">fftfilt=dc_Y=0:weight_Y='1+squish(1-(Y+X)/100)'
- </pre></div>
- </li><li>Blur:
- <div class="example">
- <pre class="example-preformatted">fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'
- </pre></div>
- </li></ul>
- <a name="field"></a>
- <h3 class="section">39.90 field<span class="pull-right"><a class="anchor hidden-xs" href="#field" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-field" aria-hidden="true">TOC</a></span></h3>
- <p>Extract a single field from an interlaced image using stride
- arithmetic to avoid wasting CPU time. The output frames are marked as
- non-interlaced.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">type</samp></dt>
- <dd><p>Specify whether to extract the top (if the value is <code class="code">0</code> or
- <code class="code">top</code>) or the bottom field (if the value is <code class="code">1</code> or
- <code class="code">bottom</code>).
- </p></dd>
- </dl>
- <a name="fieldhint"></a>
- <h3 class="section">39.91 fieldhint<span class="pull-right"><a class="anchor hidden-xs" href="#fieldhint" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fieldhint" aria-hidden="true">TOC</a></span></h3>
- <p>Create new frames by copying the top and bottom fields from surrounding frames
- supplied as numbers by the hint file.
- </p>
- <dl class="table">
- <dt><samp class="option">hint</samp></dt>
- <dd><p>Set file containing hints: absolute/relative frame numbers.
- </p>
- <p>There must be one line for each frame in a clip. Each line must contain two
- numbers separated by the comma, optionally followed by <code class="code">-</code> or <code class="code">+</code>.
- Numbers supplied on each line of file can not be out of [N-1,N+1] where N
- is current frame number for <code class="code">absolute</code> mode or out of [-1, 1] range
- for <code class="code">relative</code> mode. First number tells from which frame to pick up top
- field and second number tells from which frame to pick up bottom field.
- </p>
- <p>If optionally followed by <code class="code">+</code> output frame will be marked as interlaced,
- else if followed by <code class="code">-</code> output frame will be marked as progressive, else
- it will be marked same as input frame.
- If optionally followed by <code class="code">t</code> output frame will use only top field, or in
- case of <code class="code">b</code> it will use only bottom field.
- If line starts with <code class="code">#</code> or <code class="code">;</code> that line is skipped.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Can be item <code class="code">absolute</code> or <code class="code">relative</code> or <code class="code">pattern</code>. Default is <code class="code">absolute</code>.
- The <code class="code">pattern</code> mode is same as <code class="code">relative</code> mode, except at last entry of file if there
- are more frames to process than <code class="code">hint</code> file is seek back to start.
- </p></dd>
- </dl>
- <p>Example of first several lines of <code class="code">hint</code> file for <code class="code">relative</code> mode:
- </p><div class="example">
- <pre class="example-preformatted">0,0 - # first frame
- 1,0 - # second frame, use third's frame top field and second's frame bottom field
- 1,0 - # third frame, use fourth's frame top field and third's frame bottom field
- 1,0 -
- 0,0 -
- 0,0 -
- 1,0 -
- 1,0 -
- 1,0 -
- 0,0 -
- 0,0 -
- 1,0 -
- 1,0 -
- 1,0 -
- 0,0 -
- </pre></div>
- <a name="fieldmatch"></a>
- <h3 class="section">39.92 fieldmatch<span class="pull-right"><a class="anchor hidden-xs" href="#fieldmatch" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fieldmatch" aria-hidden="true">TOC</a></span></h3>
- <p>Field matching filter for inverse telecine. It is meant to reconstruct the
- progressive frames from a telecined stream. The filter does not drop duplicated
- frames, so to achieve a complete inverse telecine <code class="code">fieldmatch</code> needs to be
- followed by a decimation filter such as <a class="ref" href="#decimate">decimate</a> in the filtergraph.
- </p>
- <p>The separation of the field matching and the decimation is notably motivated by
- the possibility of inserting a de-interlacing filter fallback between the two.
- If the source has mixed telecined and real interlaced content,
- <code class="code">fieldmatch</code> will not be able to match fields for the interlaced parts.
- But these remaining combed frames will be marked as interlaced, and thus can be
- de-interlaced by a later filter such as <a class="ref" href="#yadif">yadif</a> before decimation.
- </p>
- <p>In addition to the various configuration options, <code class="code">fieldmatch</code> can take an
- optional second stream, activated through the <samp class="option">ppsrc</samp> option. If
- enabled, the frames reconstruction will be based on the fields and frames from
- this second stream. This allows the first input to be pre-processed in order to
- help the various algorithms of the filter, while keeping the output lossless
- (assuming the fields are matched properly). Typically, a field-aware denoiser,
- or brightness/contrast adjustments can help.
- </p>
- <p>Note that this filter uses the same algorithms as TIVTC/TFM (AviSynth project)
- and VIVTC/VFM (VapourSynth project). The later is a light clone of TFM from
- which <code class="code">fieldmatch</code> is based on. While the semantic and usage are very
- close, some behaviour and options names can differ.
- </p>
- <p>The <a class="ref" href="#decimate">decimate</a> filter currently only works for constant frame rate input.
- If your input has mixed telecined (30fps) and progressive content with a lower
- framerate like 24fps use the following filterchain to produce the necessary cfr
- stream: <code class="code">dejudder,fps=30000/1001,fieldmatch,decimate</code>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">order</samp></dt>
- <dd><p>Specify the assumed field order of the input stream. Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Auto detect parity (use FFmpeg’s internal parity value).
- </p></dd>
- <dt>‘<samp class="samp">bff</samp>’</dt>
- <dd><p>Assume bottom field first.
- </p></dd>
- <dt>‘<samp class="samp">tff</samp>’</dt>
- <dd><p>Assume top field first.
- </p></dd>
- </dl>
- <p>Note that it is sometimes recommended not to trust the parity announced by the
- stream.
- </p>
- <p>Default value is <var class="var">auto</var>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the matching mode or strategy to use. <samp class="option">pc</samp> mode is the safest in the
- sense that it won’t risk creating jerkiness due to duplicate frames when
- possible, but if there are bad edits or blended fields it will end up
- outputting combed frames when a good match might actually exist. On the other
- hand, <samp class="option">pcn_ub</samp> mode is the most risky in terms of creating jerkiness,
- but will almost always find a good frame if there is one. The other values are
- all somewhere in between <samp class="option">pc</samp> and <samp class="option">pcn_ub</samp> in terms of risking
- jerkiness and creating duplicate frames versus finding good matches in sections
- with bad edits, orphaned fields, blended fields, etc.
- </p>
- <p>More details about p/c/n/u/b are available in <a class="ref" href="#p_002fc_002fn_002fu_002fb-meaning">p/c/n/u/b meaning</a> section.
- </p>
- <p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">pc</samp>’</dt>
- <dd><p>2-way matching (p/c)
- </p></dd>
- <dt>‘<samp class="samp">pc_n</samp>’</dt>
- <dd><p>2-way matching, and trying 3rd match if still combed (p/c + n)
- </p></dd>
- <dt>‘<samp class="samp">pc_u</samp>’</dt>
- <dd><p>2-way matching, and trying 3rd match (same order) if still combed (p/c + u)
- </p></dd>
- <dt>‘<samp class="samp">pc_n_ub</samp>’</dt>
- <dd><p>2-way matching, trying 3rd match if still combed, and trying 4th/5th matches if
- still combed (p/c + n + u/b)
- </p></dd>
- <dt>‘<samp class="samp">pcn</samp>’</dt>
- <dd><p>3-way matching (p/c/n)
- </p></dd>
- <dt>‘<samp class="samp">pcn_ub</samp>’</dt>
- <dd><p>3-way matching, and trying 4th/5th matches if all 3 of the original matches are
- detected as combed (p/c/n + u/b)
- </p></dd>
- </dl>
- <p>The parenthesis at the end indicate the matches that would be used for that
- mode assuming <samp class="option">order</samp>=<var class="var">tff</var> (and <samp class="option">field</samp> on <var class="var">auto</var> or
- <var class="var">top</var>).
- </p>
- <p>In terms of speed <samp class="option">pc</samp> mode is by far the fastest and <samp class="option">pcn_ub</samp> is
- the slowest.
- </p>
- <p>Default value is <var class="var">pc_n</var>.
- </p>
- </dd>
- <dt><samp class="option">ppsrc</samp></dt>
- <dd><p>Mark the main input stream as a pre-processed input, and enable the secondary
- input stream as the clean source to pick the fields from. See the filter
- introduction for more details. It is similar to the <samp class="option">clip2</samp> feature from
- VFM/TFM.
- </p>
- <p>Default value is <code class="code">0</code> (disabled).
- </p>
- </dd>
- <dt><samp class="option">field</samp></dt>
- <dd><p>Set the field to match from. It is recommended to set this to the same value as
- <samp class="option">order</samp> unless you experience matching failures with that setting. In
- certain circumstances changing the field that is used to match from can have a
- large impact on matching performance. Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Automatic (same value as <samp class="option">order</samp>).
- </p></dd>
- <dt>‘<samp class="samp">bottom</samp>’</dt>
- <dd><p>Match from the bottom field.
- </p></dd>
- <dt>‘<samp class="samp">top</samp>’</dt>
- <dd><p>Match from the top field.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">auto</var>.
- </p>
- </dd>
- <dt><samp class="option">mchroma</samp></dt>
- <dd><p>Set whether or not chroma is included during the match comparisons. In most
- cases it is recommended to leave this enabled. You should set this to <code class="code">0</code>
- only if your clip has bad chroma problems such as heavy rainbowing or other
- artifacts. Setting this to <code class="code">0</code> could also be used to speed things up at
- the cost of some accuracy.
- </p>
- <p>Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">y0</samp></dt>
- <dt><samp class="option">y1</samp></dt>
- <dd><p>These define an exclusion band which excludes the lines between <samp class="option">y0</samp> and
- <samp class="option">y1</samp> from being included in the field matching decision. An exclusion
- band can be used to ignore subtitles, a logo, or other things that may
- interfere with the matching. <samp class="option">y0</samp> sets the starting scan line and
- <samp class="option">y1</samp> sets the ending line; all lines in between <samp class="option">y0</samp> and
- <samp class="option">y1</samp> (including <samp class="option">y0</samp> and <samp class="option">y1</samp>) will be ignored. Setting
- <samp class="option">y0</samp> and <samp class="option">y1</samp> to the same value will disable the feature.
- <samp class="option">y0</samp> and <samp class="option">y1</samp> defaults to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">scthresh</samp></dt>
- <dd><p>Set the scene change detection threshold as a percentage of maximum change on
- the luma plane. Good values are in the <code class="code">[8.0, 14.0]</code> range. Scene change
- detection is only relevant in case <samp class="option">combmatch</samp>=<var class="var">sc</var>. The range for
- <samp class="option">scthresh</samp> is <code class="code">[0.0, 100.0]</code>.
- </p>
- <p>Default value is <code class="code">12.0</code>.
- </p>
- </dd>
- <dt><samp class="option">combmatch</samp></dt>
- <dd><p>When <samp class="option">combatch</samp> is not <var class="var">none</var>, <code class="code">fieldmatch</code> will take into
- account the combed scores of matches when deciding what match to use as the
- final match. Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No final matching based on combed scores.
- </p></dd>
- <dt>‘<samp class="samp">sc</samp>’</dt>
- <dd><p>Combed scores are only used when a scene change is detected.
- </p></dd>
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>Use combed scores all the time.
- </p></dd>
- </dl>
- <p>Default is <var class="var">sc</var>.
- </p>
- </dd>
- <dt><samp class="option">combdbg</samp></dt>
- <dd><p>Force <code class="code">fieldmatch</code> to calculate the combed metrics for certain matches and
- print them. This setting is known as <samp class="option">micout</samp> in TFM/VFM vocabulary.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No forced calculation.
- </p></dd>
- <dt>‘<samp class="samp">pcn</samp>’</dt>
- <dd><p>Force p/c/n calculations.
- </p></dd>
- <dt>‘<samp class="samp">pcnub</samp>’</dt>
- <dd><p>Force p/c/n/u/b calculations.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">none</var>.
- </p>
- </dd>
- <dt><samp class="option">cthresh</samp></dt>
- <dd><p>This is the area combing threshold used for combed frame detection. This
- essentially controls how "strong" or "visible" combing must be to be detected.
- Larger values mean combing must be more visible and smaller values mean combing
- can be less visible or strong and still be detected. Valid settings are from
- <code class="code">-1</code> (every pixel will be detected as combed) to <code class="code">255</code> (no pixel will
- be detected as combed). This is basically a pixel difference value. A good
- range is <code class="code">[8, 12]</code>.
- </p>
- <p>Default value is <code class="code">9</code>.
- </p>
- </dd>
- <dt><samp class="option">chroma</samp></dt>
- <dd><p>Sets whether or not chroma is considered in the combed frame decision. Only
- disable this if your source has chroma problems (rainbowing, etc.) that are
- causing problems for the combed frame detection with chroma enabled. Actually,
- using <samp class="option">chroma</samp>=<var class="var">0</var> is usually more reliable, except for the case
- where there is chroma only combing in the source.
- </p>
- <p>Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">blockx</samp></dt>
- <dt><samp class="option">blocky</samp></dt>
- <dd><p>Respectively set the x-axis and y-axis size of the window used during combed
- frame detection. This has to do with the size of the area in which
- <samp class="option">combpel</samp> pixels are required to be detected as combed for a frame to be
- declared combed. See the <samp class="option">combpel</samp> parameter description for more info.
- Possible values are any number that is a power of 2 starting at 4 and going up
- to 512.
- </p>
- <p>Default value is <code class="code">16</code>.
- </p>
- </dd>
- <dt><samp class="option">combpel</samp></dt>
- <dd><p>The number of combed pixels inside any of the <samp class="option">blocky</samp> by
- <samp class="option">blockx</samp> size blocks on the frame for the frame to be detected as
- combed. While <samp class="option">cthresh</samp> controls how "visible" the combing must be, this
- setting controls "how much" combing there must be in any localized area (a
- window defined by the <samp class="option">blockx</samp> and <samp class="option">blocky</samp> settings) on the
- frame. Minimum value is <code class="code">0</code> and maximum is <code class="code">blocky x blockx</code> (at
- which point no frames will ever be detected as combed). This setting is known
- as <samp class="option">MI</samp> in TFM/VFM vocabulary.
- </p>
- <p>Default value is <code class="code">80</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="p_002fc_002fn_002fu_002fb-meaning"></a><a name="p_002fc_002fn_002fu_002fb-meaning-1"></a>
- <h4 class="subsection">39.92.1 p/c/n/u/b meaning<span class="pull-right"><a class="anchor hidden-xs" href="#p_002fc_002fn_002fu_002fb-meaning-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-p_002fc_002fn_002fu_002fb-meaning-1" aria-hidden="true">TOC</a></span></h4>
- <a name="p_002fc_002fn"></a>
- <h4 class="subsubsection">39.92.1.1 p/c/n<span class="pull-right"><a class="anchor hidden-xs" href="#p_002fc_002fn" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-p_002fc_002fn" aria-hidden="true">TOC</a></span></h4>
- <p>We assume the following telecined stream:
- </p>
- <div class="example">
- <pre class="example-preformatted">Top fields: 1 2 2 3 4
- Bottom fields: 1 2 3 4 4
- </pre></div>
- <p>The numbers correspond to the progressive frame the fields relate to. Here, the
- first two frames are progressive, the 3rd and 4th are combed, and so on.
- </p>
- <p>When <code class="code">fieldmatch</code> is configured to run a matching from bottom
- (<samp class="option">field</samp>=<var class="var">bottom</var>) this is how this input stream get transformed:
- </p>
- <div class="example">
- <pre class="example-preformatted">Input stream:
- T 1 2 2 3 4
- B 1 2 3 4 4 <-- matching reference
- Matches: c c n n c
- Output stream:
- T 1 2 3 4 4
- B 1 2 3 4 4
- </pre></div>
- <p>As a result of the field matching, we can see that some frames get duplicated.
- To perform a complete inverse telecine, you need to rely on a decimation filter
- after this operation. See for instance the <a class="ref" href="#decimate">decimate</a> filter.
- </p>
- <p>The same operation now matching from top fields (<samp class="option">field</samp>=<var class="var">top</var>)
- looks like this:
- </p>
- <div class="example">
- <pre class="example-preformatted">Input stream:
- T 1 2 2 3 4 <-- matching reference
- B 1 2 3 4 4
- Matches: c c p p c
- Output stream:
- T 1 2 2 3 4
- B 1 2 2 3 4
- </pre></div>
- <p>In these examples, we can see what <var class="var">p</var>, <var class="var">c</var> and <var class="var">n</var> mean;
- basically, they refer to the frame and field of the opposite parity:
- </p>
- <ul class="itemize mark-bullet">
- <li><var class="var">p</var> matches the field of the opposite parity in the previous frame
- </li><li><var class="var">c</var> matches the field of the opposite parity in the current frame
- </li><li><var class="var">n</var> matches the field of the opposite parity in the next frame
- </li></ul>
- <a name="u_002fb"></a>
- <h4 class="subsubsection">39.92.1.2 u/b<span class="pull-right"><a class="anchor hidden-xs" href="#u_002fb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-u_002fb" aria-hidden="true">TOC</a></span></h4>
- <p>The <var class="var">u</var> and <var class="var">b</var> matching are a bit special in the sense that they match
- from the opposite parity flag. In the following examples, we assume that we are
- currently matching the 2nd frame (Top:2, bottom:2). According to the match, a
- ’x’ is placed above and below each matched fields.
- </p>
- <p>With bottom matching (<samp class="option">field</samp>=<var class="var">bottom</var>):
- </p><div class="example">
- <pre class="example-preformatted">Match: c p n b u
- x x x x x
- Top 1 2 2 1 2 2 1 2 2 1 2 2 1 2 2
- Bottom 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
- x x x x x
- Output frames:
- 2 1 2 2 2
- 2 2 2 1 3
- </pre></div>
- <p>With top matching (<samp class="option">field</samp>=<var class="var">top</var>):
- </p><div class="example">
- <pre class="example-preformatted">Match: c p n b u
- x x x x x
- Top 1 2 2 1 2 2 1 2 2 1 2 2 1 2 2
- Bottom 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
- x x x x x
- Output frames:
- 2 2 2 1 2
- 2 1 3 2 2
- </pre></div>
- <a name="Examples-122"></a>
- <h4 class="subsection">39.92.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-122" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-122" aria-hidden="true">TOC</a></span></h4>
- <p>Simple IVTC of a top field first telecined stream:
- </p><div class="example">
- <pre class="example-preformatted">fieldmatch=order=tff:combmatch=none, decimate
- </pre></div>
- <p>Advanced IVTC, with fallback on <a class="ref" href="#yadif">yadif</a> for still combed frames:
- </p><div class="example">
- <pre class="example-preformatted">fieldmatch=order=tff:combmatch=full, yadif=deint=interlaced, decimate
- </pre></div>
- <a name="fieldorder"></a>
- <h3 class="section">39.93 fieldorder<span class="pull-right"><a class="anchor hidden-xs" href="#fieldorder" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fieldorder" aria-hidden="true">TOC</a></span></h3>
- <p>Transform the field order of the input video.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">order</samp></dt>
- <dd><p>The output field order. Valid values are <var class="var">tff</var> for top field first or <var class="var">bff</var>
- for bottom field first.
- </p></dd>
- </dl>
- <p>The default value is ‘<samp class="samp">tff</samp>’.
- </p>
- <p>The transformation is done by shifting the picture content up or down
- by one line, and filling the remaining line with appropriate picture content.
- This method is consistent with most broadcast field order converters.
- </p>
- <p>If the input video is not flagged as being interlaced, or it is already
- flagged as being of the required output field order, then this filter does
- not alter the incoming video.
- </p>
- <p>It is very useful when converting to or from PAL DV material,
- which is bottom field first.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.vob -vf "fieldorder=bff" out.dv
- </pre></div>
- <a name="fillborders"></a>
- <h3 class="section">39.94 fillborders<span class="pull-right"><a class="anchor hidden-xs" href="#fillborders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fillborders" aria-hidden="true">TOC</a></span></h3>
- <p>Fill borders of the input video, without changing video stream dimensions.
- Sometimes video can have garbage at the four edges and you may not want to
- crop video input to keep size multiple of some number.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">left</samp></dt>
- <dd><p>Number of pixels to fill from left border.
- </p>
- </dd>
- <dt><samp class="option">right</samp></dt>
- <dd><p>Number of pixels to fill from right border.
- </p>
- </dd>
- <dt><samp class="option">top</samp></dt>
- <dd><p>Number of pixels to fill from top border.
- </p>
- </dd>
- <dt><samp class="option">bottom</samp></dt>
- <dd><p>Number of pixels to fill from bottom border.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set fill mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">smear</samp>’</dt>
- <dd><p>fill pixels using outermost pixels
- </p>
- </dd>
- <dt>‘<samp class="samp">mirror</samp>’</dt>
- <dd><p>fill pixels using mirroring (half sample symmetric)
- </p>
- </dd>
- <dt>‘<samp class="samp">fixed</samp>’</dt>
- <dd><p>fill pixels with constant value
- </p>
- </dd>
- <dt>‘<samp class="samp">reflect</samp>’</dt>
- <dd><p>fill pixels using reflecting (whole sample symmetric)
- </p>
- </dd>
- <dt>‘<samp class="samp">wrap</samp>’</dt>
- <dd><p>fill pixels using wrapping
- </p>
- </dd>
- <dt>‘<samp class="samp">fade</samp>’</dt>
- <dd><p>fade pixels to constant value
- </p>
- </dd>
- <dt>‘<samp class="samp">margins</samp>’</dt>
- <dd><p>fill pixels at top and bottom with weighted averages pixels near borders
- </p></dd>
- </dl>
- <p>Default is <var class="var">smear</var>.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Set color for pixels in fixed or fade mode. Default is <var class="var">black</var>.
- </p></dd>
- </dl>
- <a name="Commands-93"></a>
- <h4 class="subsection">39.94.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-93" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-93" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="find_005frect"></a>
- <h3 class="section">39.95 find_rect<span class="pull-right"><a class="anchor hidden-xs" href="#find_005frect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-find_005frect" aria-hidden="true">TOC</a></span></h3>
- <p>Find a rectangular object in the input video.
- </p>
- <p>The object to search for must be specified as a gray8 image specified with the
- <samp class="option">object</samp> option.
- </p>
- <p>For each possible match, a score is computed. If the score reaches the specified
- threshold, the object is considered found.
- </p>
- <p>If the input video contains multiple instances of the object, the filter will
- find only one of them.
- </p>
- <p>When an object is found, the following metadata entries are set in the matching
- frame:
- </p><dl class="table">
- <dt><samp class="option">lavfi.rect.w</samp></dt>
- <dd><p>width of object
- </p>
- </dd>
- <dt><samp class="option">lavfi.rect.h</samp></dt>
- <dd><p>height of object
- </p>
- </dd>
- <dt><samp class="option">lavfi.rect.x</samp></dt>
- <dd><p>x position of object
- </p>
- </dd>
- <dt><samp class="option">lavfi.rect.y</samp></dt>
- <dd><p>y position of object
- </p>
- </dd>
- <dt><samp class="option">lavfi.rect.score</samp></dt>
- <dd><p>match score of the found object
- </p></dd>
- </dl>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">object</samp></dt>
- <dd><p>Filepath of the object image, needs to be in gray8.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Detection threshold, expressed as a decimal number in the range 0-1.
- </p>
- <p>A threshold value of 0.01 means only exact matches, a threshold of 0.99 means
- almost everything matches.
- </p>
- <p>Default value is 0.5.
- </p>
- </dd>
- <dt><samp class="option">mipmaps</samp></dt>
- <dd><p>Number of mipmaps, default is 3.
- </p>
- </dd>
- <dt><samp class="option">xmin, ymin, xmax, ymax</samp></dt>
- <dd><p>Specifies the rectangle in which to search.
- </p>
- </dd>
- <dt><samp class="option">discard</samp></dt>
- <dd><p>Discard frames where object is not detected. Default is disabled.
- </p></dd>
- </dl>
- <a name="Examples-123"></a>
- <h4 class="subsection">39.95.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-123" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-123" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Cover a rectangular object by the supplied image of a given video using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv
- </pre></div>
- </li><li>Find the position of an object in each frame using <code class="command">ffprobe</code> and write
- it to a log file:
- <div class="example">
- <pre class="example-preformatted">ffprobe -f lavfi movie=test.mp4,find_rect=object=object.pgm:threshold=0.3 \
- -show_entries frame=pkt_pts_time:frame_tags=lavfi.rect.x,lavfi.rect.y \
- -of csv -o find_rect.csv
- </pre></div>
- </li></ul>
- <a name="floodfill"></a>
- <h3 class="section">39.96 floodfill<span class="pull-right"><a class="anchor hidden-xs" href="#floodfill" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-floodfill" aria-hidden="true">TOC</a></span></h3>
- <p>Flood area with values of same pixel components with another values.
- </p>
- <p>It accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set pixel x coordinate.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set pixel y coordinate.
- </p>
- </dd>
- <dt><samp class="option">s0</samp></dt>
- <dd><p>Set source #0 component value.
- </p>
- </dd>
- <dt><samp class="option">s1</samp></dt>
- <dd><p>Set source #1 component value.
- </p>
- </dd>
- <dt><samp class="option">s2</samp></dt>
- <dd><p>Set source #2 component value.
- </p>
- </dd>
- <dt><samp class="option">s3</samp></dt>
- <dd><p>Set source #3 component value.
- </p>
- </dd>
- <dt><samp class="option">d0</samp></dt>
- <dd><p>Set destination #0 component value.
- </p>
- </dd>
- <dt><samp class="option">d1</samp></dt>
- <dd><p>Set destination #1 component value.
- </p>
- </dd>
- <dt><samp class="option">d2</samp></dt>
- <dd><p>Set destination #2 component value.
- </p>
- </dd>
- <dt><samp class="option">d3</samp></dt>
- <dd><p>Set destination #3 component value.
- </p></dd>
- </dl>
- <a class="anchor" id="format"></a><a name="format-1"></a>
- <h3 class="section">39.97 format<span class="pull-right"><a class="anchor hidden-xs" href="#format-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-format-1" aria-hidden="true">TOC</a></span></h3>
- <p>Convert the input video to one of the specified pixel formats.
- Libavfilter will try to pick one that is suitable as input to
- the next filter.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">pix_fmts</samp></dt>
- <dd><p>A ’|’-separated list of pixel format names, such as
- "pix_fmts=yuv420p|monow|rgb24".
- </p>
- </dd>
- <dt><samp class="option">color_spaces</samp></dt>
- <dd><p>A ’|’-separated list of color space names, such as
- "color_spaces=bt709|bt470bg|bt2020nc".
- </p>
- </dd>
- <dt><samp class="option">color_ranges</samp></dt>
- <dd><p>A ’|’-separated list of color range names, such as
- "color_ranges=tv|pc".
- </p>
- </dd>
- <dt><samp class="option">alpha_modes</samp></dt>
- <dd><p>A ’|’-separated list of color range names, such as
- "alpha_modes=straight|premultiplied".
- </p>
- </dd>
- </dl>
- <a name="Examples-124"></a>
- <h4 class="subsection">39.97.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-124" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-124" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert the input video to the <var class="var">yuv420p</var> format
- <div class="example">
- <pre class="example-preformatted">format=pix_fmts=yuv420p
- </pre></div>
- <p>Convert the input video to any of the formats in the list
- </p><div class="example">
- <pre class="example-preformatted">format=pix_fmts=yuv420p|yuv444p|yuv410p
- </pre></div>
- </li></ul>
- <a class="anchor" id="fps"></a><a name="fps-1"></a>
- <h3 class="section">39.98 fps<span class="pull-right"><a class="anchor hidden-xs" href="#fps-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fps-1" aria-hidden="true">TOC</a></span></h3>
- <p>Convert the video to specified constant frame rate by duplicating or dropping
- frames as necessary.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">fps</samp></dt>
- <dd><p>The desired output frame rate. It accepts expressions containing the following
- constants:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">source_fps</samp>’</dt>
- <dd><p>The input’s frame rate
- </p>
- </dd>
- <dt>‘<samp class="samp">ntsc</samp>’</dt>
- <dd><p>NTSC frame rate of <code class="code">30000/1001</code>
- </p>
- </dd>
- <dt>‘<samp class="samp">pal</samp>’</dt>
- <dd><p>PAL frame rate of <code class="code">25.0</code>
- </p>
- </dd>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dd><p>Film frame rate of <code class="code">24.0</code>
- </p>
- </dd>
- <dt>‘<samp class="samp">ntsc_film</samp>’</dt>
- <dd><p>NTSC-film frame rate of <code class="code">24000/1001</code>
- </p></dd>
- </dl>
- <p>The default is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">start_time</samp></dt>
- <dd><p>Assume the first PTS should be the given value, in seconds. This allows for
- padding/trimming at the start of stream. By default, no assumption is made
- about the first frame’s expected PTS, so no padding or trimming is done.
- For example, this could be set to 0 to pad the beginning with duplicates of
- the first frame if a video stream starts after the audio stream or to trim any
- frames with a negative PTS.
- </p>
- </dd>
- <dt><samp class="option">round</samp></dt>
- <dd><p>Timestamp (PTS) rounding method.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><samp class="option">zero</samp></dt>
- <dd><p>round towards 0
- </p></dd>
- <dt><samp class="option">inf</samp></dt>
- <dd><p>round away from 0
- </p></dd>
- <dt><samp class="option">down</samp></dt>
- <dd><p>round towards -infinity
- </p></dd>
- <dt><samp class="option">up</samp></dt>
- <dd><p>round towards +infinity
- </p></dd>
- <dt><samp class="option">near</samp></dt>
- <dd><p>round to nearest
- </p></dd>
- </dl>
- <p>The default is <code class="code">near</code>.
- </p>
- </dd>
- <dt><samp class="option">eof_action</samp></dt>
- <dd><p>Action performed when reading the last frame.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><samp class="option">round</samp></dt>
- <dd><p>Use same timestamp rounding method as used for other frames.
- </p></dd>
- <dt><samp class="option">pass</samp></dt>
- <dd><p>Pass through last frame if input duration has not been reached yet.
- </p></dd>
- </dl>
- <p>The default is <code class="code">round</code>.
- </p>
- </dd>
- </dl>
- <p>Alternatively, the options can be specified as a flat string:
- <var class="var">fps</var>[:<var class="var">start_time</var>[:<var class="var">round</var>]].
- </p>
- <p>See also the <a class="ref" href="#setpts">setpts</a> filter.
- </p>
- <a name="Examples-125"></a>
- <h4 class="subsection">39.98.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-125" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-125" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>A typical usage in order to set the fps to 25:
- <div class="example">
- <pre class="example-preformatted">fps=fps=25
- </pre></div>
- </li><li>Sets the fps to 24, using abbreviation and rounding method to round to nearest:
- <div class="example">
- <pre class="example-preformatted">fps=fps=film:round=near
- </pre></div>
- </li></ul>
- <a name="framepack"></a>
- <h3 class="section">39.99 framepack<span class="pull-right"><a class="anchor hidden-xs" href="#framepack" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-framepack" aria-hidden="true">TOC</a></span></h3>
- <p>Pack two different video streams into a stereoscopic video, setting proper
- metadata on supported codecs. The two views should have the same size and
- framerate and processing will stop when the shorter video ends. Please note
- that you may conveniently adjust view properties with the <a class="ref" href="#scale">scale</a> and
- <a class="ref" href="#fps">fps</a> filters.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">format</samp></dt>
- <dd><p>The desired packing format. Supported values are:
- </p>
- <dl class="table">
- <dt><samp class="option">sbs</samp></dt>
- <dd><p>The views are next to each other (default).
- </p>
- </dd>
- <dt><samp class="option">tab</samp></dt>
- <dd><p>The views are on top of each other.
- </p>
- </dd>
- <dt><samp class="option">lines</samp></dt>
- <dd><p>The views are packed by line.
- </p>
- </dd>
- <dt><samp class="option">columns</samp></dt>
- <dd><p>The views are packed by column.
- </p>
- </dd>
- <dt><samp class="option">frameseq</samp></dt>
- <dd><p>The views are temporally interleaved.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <p>Some examples:
- </p>
- <div class="example">
- <pre class="example-preformatted"># Convert left and right views into a frame-sequential video
- ffmpeg -i LEFT -i RIGHT -filter_complex framepack=frameseq OUTPUT
- # Convert views into a side-by-side video with the same output resolution as the input
- ffmpeg -i LEFT -i RIGHT -filter_complex [0:v]scale=w=iw/2[left],[1:v]scale=w=iw/2[right],[left][right]framepack=sbs OUTPUT
- </pre></div>
- <a name="framerate"></a>
- <h3 class="section">39.100 framerate<span class="pull-right"><a class="anchor hidden-xs" href="#framerate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-framerate" aria-hidden="true">TOC</a></span></h3>
- <p>Change the frame rate by interpolating new video output frames from the source
- frames.
- </p>
- <p>This filter is not designed to function correctly with interlaced media. If
- you wish to change the frame rate of interlaced media then you are required
- to deinterlace before this filter and re-interlace after this filter.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">fps</samp></dt>
- <dd><p>Specify the output frames per second. This option can also be specified
- as a value alone. The default is <code class="code">50</code>.
- </p>
- </dd>
- <dt><samp class="option">interp_start</samp></dt>
- <dd><p>Specify the start of a range where the output frame will be created as a
- linear interpolation of two frames. The range is [<code class="code">0</code>-<code class="code">255</code>],
- the default is <code class="code">15</code>.
- </p>
- </dd>
- <dt><samp class="option">interp_end</samp></dt>
- <dd><p>Specify the end of a range where the output frame will be created as a
- linear interpolation of two frames. The range is [<code class="code">0</code>-<code class="code">255</code>],
- the default is <code class="code">240</code>.
- </p>
- </dd>
- <dt><samp class="option">scene</samp></dt>
- <dd><p>Specify the level at which a scene change is detected as a value between
- 0 and 100 to indicate a new scene; a low value reflects a low
- probability for the current frame to introduce a new scene, while a higher
- value means the current frame is more likely to be one.
- The default is <code class="code">8.2</code>.
- </p>
- </dd>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>Specify flags influencing the filter process.
- </p>
- <p>Available value for <var class="var">flags</var> is:
- </p>
- <dl class="table">
- <dt><samp class="option">scene_change_detect, scd</samp></dt>
- <dd><p>Enable scene change detection using the value of the option <var class="var">scene</var>.
- This flag is enabled by default.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="framestep"></a>
- <h3 class="section">39.101 framestep<span class="pull-right"><a class="anchor hidden-xs" href="#framestep" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-framestep" aria-hidden="true">TOC</a></span></h3>
- <p>Select one frame every N-th frame.
- </p>
- <p>This filter accepts the following option:
- </p><dl class="table">
- <dt><samp class="option">step</samp></dt>
- <dd><p>Select frame after every <code class="code">step</code> frames.
- Allowed values are positive integers higher than 0. Default value is <code class="code">1</code>.
- </p></dd>
- </dl>
- <a name="freezedetect"></a>
- <h3 class="section">39.102 freezedetect<span class="pull-right"><a class="anchor hidden-xs" href="#freezedetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-freezedetect" aria-hidden="true">TOC</a></span></h3>
- <p>Detect frozen video.
- </p>
- <p>This filter logs a message and sets frame metadata when it detects that the
- input video has no significant change in content during a specified duration.
- Video freeze detection calculates the mean average absolute difference of all
- the components of video frames and compares it to a noise floor.
- </p>
- <p>The printed times and duration are expressed in seconds. The
- <code class="code">lavfi.freezedetect.freeze_start</code> metadata key is set on the first frame
- whose timestamp equals or exceeds the detection duration and it contains the
- timestamp of the first frame of the freeze. The
- <code class="code">lavfi.freezedetect.freeze_duration</code> and
- <code class="code">lavfi.freezedetect.freeze_end</code> metadata keys are set on the first frame
- after the freeze.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">noise, n</samp></dt>
- <dd><p>Set noise tolerance. Can be specified in dB (in case "dB" is appended to the
- specified value) or as a difference ratio between 0 and 1. Default is -60dB, or
- 0.001.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set freeze duration until notification (default is 2 seconds).
- </p></dd>
- </dl>
- <a name="freezeframes"></a>
- <h3 class="section">39.103 freezeframes<span class="pull-right"><a class="anchor hidden-xs" href="#freezeframes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-freezeframes" aria-hidden="true">TOC</a></span></h3>
- <p>Freeze video frames.
- </p>
- <p>This filter freezes video frames using frame from 2nd input.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">first</samp></dt>
- <dd><p>Set number of first frame from which to start freeze.
- </p>
- </dd>
- <dt><samp class="option">last</samp></dt>
- <dd><p>Set number of last frame from which to end freeze.
- </p>
- </dd>
- <dt><samp class="option">replace</samp></dt>
- <dd><p>Set number of frame from 2nd input which will be used instead of replaced frames.
- </p></dd>
- </dl>
- <a class="anchor" id="frei0r"></a><a name="frei0r-1"></a>
- <h3 class="section">39.104 frei0r<span class="pull-right"><a class="anchor hidden-xs" href="#frei0r-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-frei0r-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a frei0r effect to the input video.
- </p>
- <p>To enable the compilation of this filter, you need to install the frei0r
- header and configure FFmpeg with <code class="code">--enable-frei0r</code>.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">filter_name</samp></dt>
- <dd><p>The name of the frei0r effect to load. If the environment variable
- <code class="env">FREI0R_PATH</code> is defined, the frei0r effect is searched for in each of the
- directories specified by the colon-separated list in <code class="env">FREI0R_PATH</code>.
- Otherwise, the standard frei0r paths are searched, in this order:
- <samp class="file">HOME/.frei0r-1/lib/</samp>, <samp class="file">/usr/local/lib/frei0r-1/</samp>,
- <samp class="file">/usr/lib/frei0r-1/</samp>.
- </p>
- </dd>
- <dt><samp class="option">filter_params</samp></dt>
- <dd><p>A ’|’-separated list of parameters to pass to the frei0r effect.
- </p>
- </dd>
- </dl>
- <p>A frei0r effect parameter can be a boolean (its value is either
- "y" or "n"), a double, a color (specified as
- <var class="var">R</var>/<var class="var">G</var>/<var class="var">B</var>, where <var class="var">R</var>, <var class="var">G</var>, and <var class="var">B</var> are floating point
- numbers between 0.0 and 1.0, inclusive) or a color description as specified in the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>,
- a position (specified as <var class="var">X</var>/<var class="var">Y</var>, where
- <var class="var">X</var> and <var class="var">Y</var> are floating point numbers) and/or a string.
- </p>
- <p>The number and types of parameters depend on the loaded effect. If an
- effect parameter is not specified, the default value is set.
- </p>
- <a name="Examples-126"></a>
- <h4 class="subsection">39.104.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-126" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-126" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply the distort0r effect, setting the first two double parameters:
- <div class="example">
- <pre class="example-preformatted">frei0r=filter_name=distort0r:filter_params=0.5|0.01
- </pre></div>
- </li><li>Apply the colordistance effect, taking a color as the first parameter:
- <div class="example">
- <pre class="example-preformatted">frei0r=colordistance:0.2/0.3/0.4
- frei0r=colordistance:violet
- frei0r=colordistance:0x112233
- </pre></div>
- </li><li>Apply the perspective effect, specifying the top left and top right image
- positions:
- <div class="example">
- <pre class="example-preformatted">frei0r=perspective:0.2/0.2|0.8/0.2
- </pre></div>
- </li></ul>
- <p>For more information, see
- <a class="url" href="http://frei0r.dyne.org">http://frei0r.dyne.org</a>
- </p>
- <a name="Commands-94"></a>
- <h4 class="subsection">39.104.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-94" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-94" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the <samp class="option">filter_params</samp> option as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="fspp"></a>
- <h3 class="section">39.105 fspp<span class="pull-right"><a class="anchor hidden-xs" href="#fspp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fspp" aria-hidden="true">TOC</a></span></h3>
- <p>Apply fast and simple postprocessing. It is a faster version of <a class="ref" href="#spp">spp</a>.
- </p>
- <p>It splits (I)DCT into horizontal/vertical passes. Unlike the simple post-
- processing filter, one of them is performed once per block, not per pixel.
- This allows for much higher speed.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">quality</samp></dt>
- <dd><p>Set quality. This option defines the number of levels for averaging. It accepts
- an integer in the range 4-5. Default value is <code class="code">4</code>.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Force a constant quantization parameter. It accepts an integer in range 0-63.
- If not set, the filter will use the QP from the video stream (if available).
- </p>
- </dd>
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Set filter strength. It accepts an integer in range -15 to 32. Lower values mean
- more details but also more artifacts, while higher values make the image smoother
- but also blurrier. Default value is <code class="code">0</code> − PSNR optimal.
- </p>
- </dd>
- <dt><samp class="option">use_bframe_qp</samp></dt>
- <dd><p>Enable the use of the QP from the B-Frames if set to <code class="code">1</code>. Using this
- option may cause flicker since the B-Frames have often larger QP. Default is
- <code class="code">0</code> (not enabled).
- </p>
- </dd>
- </dl>
- <a class="anchor" id="fsync"></a><a name="fsync-1"></a>
- <h3 class="section">39.106 fsync<span class="pull-right"><a class="anchor hidden-xs" href="#fsync-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fsync-1" aria-hidden="true">TOC</a></span></h3>
- <p>Synchronize video frames with an external mapping from a file.
- </p>
- <p>For each input PTS given in the map file it either drops or creates as many
- frames as necessary to recreate the sequence of output frames given in the
- map file.
- </p>
- <p>This filter is useful to recreate the output frames of a framerate conversion
- by the <a class="ref" href="#fps">fps</a> filter, recorded into a map file using the ffmpeg option
- <code class="code">-stats_mux_pre</code>, and do further processing to the corresponding frames
- e.g. quality comparison.
- </p>
- <p>Each line of the map file must contain three items per input frame, the input
- PTS (decimal), the output PTS (decimal) and the
- output TIMEBASE (decimal/decimal), separated by a space.
- This file format corresponds to the output
- of <code class="code">-stats_mux_pre_fmt="{ptsi} {pts} {tb}"</code>.
- </p>
- <p>The filter assumes the map file is sorted by increasing input PTS.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">file, f</samp></dt>
- <dd><p>The filename of the map file to be used.
- </p></dd>
- </dl>
- <p>Example:
- </p><div class="example">
- <pre class="example-preformatted"># Convert a video to 25 fps and record a MAP_FILE file with the default format of this filter
- ffmpeg -i INPUT -vf fps=fps=25 -stats_mux_pre MAP_FILE -stats_mux_pre_fmt "{ptsi} {pts} {tb}" OUTPUT
- # Sort MAP_FILE by increasing input PTS
- sort -n MAP_FILE
- # Use INPUT, OUTPUT and the MAP_FILE from above to compare the corresponding frames in INPUT and OUTPUT via SSIM
- ffmpeg -i INPUT -i OUTPUT -filter_complex '[0:v]fsync=file=MAP_FILE[ref];[1:v][ref]ssim' -f null -
- </pre></div>
- <a name="gblur"></a>
- <h3 class="section">39.107 gblur<span class="pull-right"><a class="anchor hidden-xs" href="#gblur" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gblur" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Gaussian blur filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>Set horizontal sigma, standard deviation of Gaussian blur. Default is <code class="code">0.5</code>.
- </p>
- </dd>
- <dt><samp class="option">steps</samp></dt>
- <dd><p>Set number of steps for Gaussian approximation. Default is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. By default all planes are filtered.
- </p>
- </dd>
- <dt><samp class="option">sigmaV</samp></dt>
- <dd><p>Set vertical sigma, if negative it will be same as <code class="code">sigma</code>.
- Default is <code class="code">-1</code>.
- </p></dd>
- </dl>
- <a name="Commands-95"></a>
- <h4 class="subsection">39.107.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-95" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-95" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same commands as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="geq"></a>
- <h3 class="section">39.108 geq<span class="pull-right"><a class="anchor hidden-xs" href="#geq" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-geq" aria-hidden="true">TOC</a></span></h3>
- <p>Apply generic equation to each pixel.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">lum_expr, lum</samp></dt>
- <dd><p>Set the luma expression.
- </p></dd>
- <dt><samp class="option">cb_expr, cb</samp></dt>
- <dd><p>Set the chrominance blue expression.
- </p></dd>
- <dt><samp class="option">cr_expr, cr</samp></dt>
- <dd><p>Set the chrominance red expression.
- </p></dd>
- <dt><samp class="option">alpha_expr, a</samp></dt>
- <dd><p>Set the alpha expression.
- </p></dd>
- <dt><samp class="option">red_expr, r</samp></dt>
- <dd><p>Set the red expression.
- </p></dd>
- <dt><samp class="option">green_expr, g</samp></dt>
- <dd><p>Set the green expression.
- </p></dd>
- <dt><samp class="option">blue_expr, b</samp></dt>
- <dd><p>Set the blue expression.
- </p></dd>
- </dl>
- <p>The colorspace is selected according to the specified options. If one
- of the <samp class="option">lum_expr</samp>, <samp class="option">cb_expr</samp>, or <samp class="option">cr_expr</samp>
- options is specified, the filter will automatically select a YCbCr
- colorspace. If one of the <samp class="option">red_expr</samp>, <samp class="option">green_expr</samp>, or
- <samp class="option">blue_expr</samp> options is specified, it will select an RGB
- colorspace.
- </p>
- <p>If one of the chrominance expression is not defined, it falls back on the other
- one. If no alpha expression is specified it will evaluate to opaque value.
- If none of chrominance expressions are specified, they will evaluate
- to the luma expression.
- </p>
- <p>The expressions can use the following variables and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">N</samp></dt>
- <dd><p>The sequential number of the filtered frame, starting from <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">X</samp></dt>
- <dt><samp class="option">Y</samp></dt>
- <dd><p>The coordinates of the current sample.
- </p>
- </dd>
- <dt><samp class="option">W</samp></dt>
- <dt><samp class="option">H</samp></dt>
- <dd><p>The width and height of the image.
- </p>
- </dd>
- <dt><samp class="option">SW</samp></dt>
- <dt><samp class="option">SH</samp></dt>
- <dd><p>Width and height scale depending on the currently filtered plane. It is the
- ratio between the corresponding luma plane number of pixels and the current
- plane ones. E.g. for YUV4:2:0 the values are <code class="code">1,1</code> for the luma plane, and
- <code class="code">0.5,0.5</code> for chroma planes.
- </p>
- </dd>
- <dt><samp class="option">T</samp></dt>
- <dd><p>Time of the current frame, expressed in seconds.
- </p>
- </dd>
- <dt><samp class="option">p(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the current
- plane.
- </p>
- </dd>
- <dt><samp class="option">lum(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the luma
- plane.
- </p>
- </dd>
- <dt><samp class="option">cb(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the
- blue-difference chroma plane. Return 0 if there is no such plane.
- </p>
- </dd>
- <dt><samp class="option">cr(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the
- red-difference chroma plane. Return 0 if there is no such plane.
- </p>
- </dd>
- <dt><samp class="option">r(x, y)</samp></dt>
- <dt><samp class="option">g(x, y)</samp></dt>
- <dt><samp class="option">b(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the
- red/green/blue component. Return 0 if there is no such component.
- </p>
- </dd>
- <dt><samp class="option">alpha(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the alpha
- plane. Return 0 if there is no such plane.
- </p>
- </dd>
- <dt><samp class="option">psum(x,y), lumsum(x, y), cbsum(x,y), crsum(x,y), rsum(x,y), gsum(x,y), bsum(x,y), alphasum(x,y)</samp></dt>
- <dd><p>Sum of sample values in the rectangle from (0,0) to (x,y), this allows obtaining
- sums of samples within a rectangle. See the functions without the sum postfix.
- </p>
- </dd>
- <dt><samp class="option">interpolation</samp></dt>
- <dd><p>Set one of interpolation methods:
- </p><dl class="table">
- <dt><samp class="option">nearest, n</samp></dt>
- <dt><samp class="option">bilinear, b</samp></dt>
- </dl>
- <p>Default is bilinear.
- </p></dd>
- </dl>
- <p>For functions, if <var class="var">x</var> and <var class="var">y</var> are outside the area, the value will be
- automatically clipped to the closer edge.
- </p>
- <p>Please note that this filter can use multiple threads in which case each slice
- will have its own expression state. If you want to use only a single expression
- state because your expressions depend on previous state then you should limit
- the number of filter threads to 1.
- </p>
- <a name="Examples-127"></a>
- <h4 class="subsection">39.108.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-127" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-127" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Flip the image horizontally:
- <div class="example">
- <pre class="example-preformatted">geq=p(W-X\,Y)
- </pre></div>
- </li><li>Generate a bidimensional sine wave, with angle <code class="code">PI/3</code> and a
- wavelength of 100 pixels:
- <div class="example">
- <pre class="example-preformatted">geq=128 + 100*sin(2*(PI/100)*(cos(PI/3)*(X-50*T) + sin(PI/3)*Y)):128:128
- </pre></div>
- </li><li>Generate a fancy enigmatic moving light:
- <div class="example">
- <pre class="example-preformatted">nullsrc=s=256x256,geq=random(1)/hypot(X-cos(N*0.07)*W/2-W/2\,Y-sin(N*0.09)*H/2-H/2)^2*1000000*sin(N*0.02):128:128
- </pre></div>
- </li><li>Generate a quick emboss effect:
- <div class="example">
- <pre class="example-preformatted">format=gray,geq=lum_expr='(p(X,Y)+(256-p(X-4,Y-4)))/2'
- </pre></div>
- </li><li>Modify RGB components depending on pixel position:
- <div class="example">
- <pre class="example-preformatted">geq=r='X/W*r(X,Y)':g='(1-X/W)*g(X,Y)':b='(H-Y)/H*b(X,Y)'
- </pre></div>
- </li><li>Create a radial gradient that is the same size as the input (also see
- the <a class="ref" href="#vignette">vignette</a> filter):
- <div class="example">
- <pre class="example-preformatted">geq=lum=255*gauss((X/W-0.5)*3)*gauss((Y/H-0.5)*3)/gauss(0)/gauss(0),format=gray
- </pre></div>
- </li></ul>
- <a name="gradfun"></a>
- <h3 class="section">39.109 gradfun<span class="pull-right"><a class="anchor hidden-xs" href="#gradfun" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gradfun" aria-hidden="true">TOC</a></span></h3>
- <p>Fix the banding artifacts that are sometimes introduced into nearly flat
- regions by truncation to 8-bit color depth.
- Interpolate the gradients that should go where the bands are, and
- dither them.
- </p>
- <p>It is designed for playback only. Do not use it prior to
- lossy compression, because compression tends to lose the dither and
- bring back the bands.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">strength</samp></dt>
- <dd><p>The maximum amount by which the filter will change any one pixel. This is also
- the threshold for detecting nearly flat regions. Acceptable values range from
- .51 to 64; the default value is 1.2. Out-of-range values will be clipped to the
- valid range.
- </p>
- </dd>
- <dt><samp class="option">radius</samp></dt>
- <dd><p>The neighborhood to fit the gradient to. A larger radius makes for smoother
- gradients, but also prevents the filter from modifying the pixels near detailed
- regions. Acceptable values are 8-32; the default value is 16. Out-of-range
- values will be clipped to the valid range.
- </p>
- </dd>
- </dl>
- <p>Alternatively, the options can be specified as a flat string:
- <var class="var">strength</var>[:<var class="var">radius</var>]
- </p>
- <a name="Examples-128"></a>
- <h4 class="subsection">39.109.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-128" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-128" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply the filter with a <code class="code">3.5</code> strength and radius of <code class="code">8</code>:
- <div class="example">
- <pre class="example-preformatted">gradfun=3.5:8
- </pre></div>
- </li><li>Specify radius, omitting the strength (which will fall-back to the default
- value):
- <div class="example">
- <pre class="example-preformatted">gradfun=radius=8
- </pre></div>
- </li></ul>
- <a class="anchor" id="graphmonitor"></a><a name="graphmonitor-1"></a>
- <h3 class="section">39.110 graphmonitor<span class="pull-right"><a class="anchor hidden-xs" href="#graphmonitor-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-graphmonitor-1" aria-hidden="true">TOC</a></span></h3>
- <p>Show various filtergraph stats.
- </p>
- <p>With this filter one can debug complete filtergraph.
- Especially issues with links filling with queued frames.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set video output size. Default is <var class="var">hd720</var>.
- </p>
- </dd>
- <dt><samp class="option">opacity, o</samp></dt>
- <dd><p>Set video opacity. Default is <var class="var">0.9</var>. Allowed range is from <var class="var">0</var> to <var class="var">1</var>.
- </p>
- </dd>
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set output mode flags.
- </p>
- <p>Available values for flags are:
- </p><dl class="table">
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>No any filtering. Default.
- </p></dd>
- <dt>‘<samp class="samp">compact</samp>’</dt>
- <dd><p>Show only filters with queued frames.
- </p></dd>
- <dt>‘<samp class="samp">nozero</samp>’</dt>
- <dd><p>Show only filters with non-zero stats.
- </p></dd>
- <dt>‘<samp class="samp">noeof</samp>’</dt>
- <dd><p>Show only filters with non-eof stat.
- </p></dd>
- <dt>‘<samp class="samp">nodisabled</samp>’</dt>
- <dd><p>Show only filters that are enabled in timeline.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">flags, f</samp></dt>
- <dd><p>Set flags which enable which stats are shown in video.
- </p>
- <p>Available values for flags are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>All flags turned off.
- </p>
- </dd>
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>All flags turned on.
- </p>
- </dd>
- <dt>‘<samp class="samp">queue</samp>’</dt>
- <dd><p>Display number of queued frames in each link.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame_count_in</samp>’</dt>
- <dd><p>Display number of frames taken from filter.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame_count_out</samp>’</dt>
- <dd><p>Display number of frames given out from filter.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame_count_delta</samp>’</dt>
- <dd><p>Display delta number of frames between above two values.
- </p>
- </dd>
- <dt>‘<samp class="samp">pts</samp>’</dt>
- <dd><p>Display current filtered frame pts.
- </p>
- </dd>
- <dt>‘<samp class="samp">pts_delta</samp>’</dt>
- <dd><p>Display pts delta between current and previous frame.
- </p>
- </dd>
- <dt>‘<samp class="samp">time</samp>’</dt>
- <dd><p>Display current filtered frame time.
- </p>
- </dd>
- <dt>‘<samp class="samp">time_delta</samp>’</dt>
- <dd><p>Display time delta between current and previous frame.
- </p>
- </dd>
- <dt>‘<samp class="samp">timebase</samp>’</dt>
- <dd><p>Display time base for filter link.
- </p>
- </dd>
- <dt>‘<samp class="samp">format</samp>’</dt>
- <dd><p>Display used format for filter link.
- </p>
- </dd>
- <dt>‘<samp class="samp">size</samp>’</dt>
- <dd><p>Display video size or number of audio channels in case of audio used by filter link.
- </p>
- </dd>
- <dt>‘<samp class="samp">rate</samp>’</dt>
- <dd><p>Display video frame rate or sample rate in case of audio used by filter link.
- </p>
- </dd>
- <dt>‘<samp class="samp">eof</samp>’</dt>
- <dd><p>Display link output status.
- </p>
- </dd>
- <dt>‘<samp class="samp">sample_count_in</samp>’</dt>
- <dd><p>Display number of samples taken from filter.
- </p>
- </dd>
- <dt>‘<samp class="samp">sample_count_out</samp>’</dt>
- <dd><p>Display number of samples given out from filter.
- </p>
- </dd>
- <dt>‘<samp class="samp">sample_count_delta</samp>’</dt>
- <dd><p>Display delta number of samples between above two values.
- </p>
- </dd>
- <dt>‘<samp class="samp">disabled</samp>’</dt>
- <dd><p>Show the timeline filter status.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set upper limit for video rate of output stream, Default value is <var class="var">25</var>.
- This guarantee that output video frame rate will not be higher than this value.
- </p></dd>
- </dl>
- <a name="grayworld"></a>
- <h3 class="section">39.111 grayworld<span class="pull-right"><a class="anchor hidden-xs" href="#grayworld" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-grayworld" aria-hidden="true">TOC</a></span></h3>
- <p>A color constancy filter that applies color correction based on the grayworld assumption
- </p>
- <p>See: <a class="url" href="https://www.researchgate.net/publication/275213614_A_New_Color_Correction_Method_for_Underwater_Imaging">https://www.researchgate.net/publication/275213614_A_New_Color_Correction_Method_for_Underwater_Imaging</a>
- </p>
- <p>The algorithm uses linear light, so input
- data should be linearized beforehand (and possibly correctly tagged).
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf zscale=transfer=linear,grayworld,zscale=transfer=bt709,format=yuv420p OUTPUT
- </pre></div>
- <a name="greyedge"></a>
- <h3 class="section">39.112 greyedge<span class="pull-right"><a class="anchor hidden-xs" href="#greyedge" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-greyedge" aria-hidden="true">TOC</a></span></h3>
- <p>A color constancy variation filter which estimates scene illumination via grey edge algorithm
- and corrects the scene colors accordingly.
- </p>
- <p>See: <a class="url" href="https://staff.science.uva.nl/th.gevers/pub/GeversTIP07.pdf">https://staff.science.uva.nl/th.gevers/pub/GeversTIP07.pdf</a>
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">difford</samp></dt>
- <dd><p>The order of differentiation to be applied on the scene. Must be chosen in the range
- [0,2] and default value is 1.
- </p>
- </dd>
- <dt><samp class="option">minknorm</samp></dt>
- <dd><p>The Minkowski parameter to be used for calculating the Minkowski distance. Must
- be chosen in the range [0,20] and default value is 1. Set to 0 for getting
- max value instead of calculating Minkowski distance.
- </p>
- </dd>
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>The standard deviation of Gaussian blur to be applied on the scene. Must be
- chosen in the range [0,1024.0] and default value = 1. floor( <var class="var">sigma</var> * break_off_sigma(3) )
- can’t be equal to 0 if <var class="var">difford</var> is greater than 0.
- </p></dd>
- </dl>
- <a name="Examples-129"></a>
- <h4 class="subsection">39.112.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-129" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-129" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Grey Edge:
- <div class="example">
- <pre class="example-preformatted">greyedge=difford=1:minknorm=5:sigma=2
- </pre></div>
- </li><li>Max Edge:
- <div class="example">
- <pre class="example-preformatted">greyedge=difford=1:minknorm=0:sigma=2
- </pre></div>
- </li></ul>
- <a name="guided"></a>
- <h3 class="section">39.113 guided<span class="pull-right"><a class="anchor hidden-xs" href="#guided" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-guided" aria-hidden="true">TOC</a></span></h3>
- <p>Apply guided filter for edge-preserving smoothing, dehazing and so on.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set the box radius in pixels.
- Allowed range is 1 to 20. Default is 3.
- </p>
- </dd>
- <dt><samp class="option">eps</samp></dt>
- <dd><p>Set regularization parameter (with square).
- Allowed range is 0 to 1. Default is 0.01.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set filter mode. Can be <code class="code">basic</code> or <code class="code">fast</code>.
- Default is <code class="code">basic</code>.
- </p>
- </dd>
- <dt><samp class="option">sub</samp></dt>
- <dd><p>Set subsampling ratio for <code class="code">fast</code> mode.
- Range is 2 to 64. Default is 4.
- No subsampling occurs in <code class="code">basic</code> mode.
- </p>
- </dd>
- <dt><samp class="option">guidance</samp></dt>
- <dd><p>Set guidance mode. Can be <code class="code">off</code> or <code class="code">on</code>. Default is <code class="code">off</code>.
- If <code class="code">off</code>, single input is required.
- If <code class="code">on</code>, two inputs of the same resolution and pixel format are required.
- The second input serves as the guidance.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter. Default is first only.
- </p></dd>
- </dl>
- <a name="Commands-96"></a>
- <h4 class="subsection">39.113.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-96" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-96" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-130"></a>
- <h4 class="subsection">39.113.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-130" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-130" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Edge-preserving smoothing with guided filter:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.png -vf guided out.png
- </pre></div>
- </li><li>Dehazing, structure-transferring filtering, detail enhancement with guided filter.
- For the generation of guidance image, refer to paper "Guided Image Filtering".
- See: <a class="url" href="http://kaiminghe.com/publications/pami12guidedfilter.pdf">http://kaiminghe.com/publications/pami12guidedfilter.pdf</a>.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.png -i guidance.png -filter_complex guided=guidance=on out.png
- </pre></div>
- </li></ul>
- <a class="anchor" id="haldclut"></a><a name="haldclut-1"></a>
- <h3 class="section">39.114 haldclut<span class="pull-right"><a class="anchor hidden-xs" href="#haldclut-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-haldclut-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a Hald CLUT to a video stream.
- </p>
- <p>First input is the video stream to process, and second one is the Hald CLUT.
- The Hald CLUT input can be a simple picture or a complete video stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">clut</samp></dt>
- <dd><p>Set which CLUT video frames will be processed from second input stream,
- can be <var class="var">first</var> or <var class="var">all</var>. Default is <var class="var">all</var>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>Force termination when the shortest input terminates. Default is <code class="code">0</code>.
- </p></dd>
- <dt><samp class="option">repeatlast</samp></dt>
- <dd><p>Continue applying the last CLUT after the end of the stream. A value of
- <code class="code">0</code> disable the filter after the last frame of the CLUT is reached.
- Default is <code class="code">1</code>.
- </p></dd>
- </dl>
- <p><code class="code">haldclut</code> also has the same interpolation options as <a class="ref" href="#lut3d">lut3d</a> (both
- filters share the same internals).
- </p>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>More information about the Hald CLUT can be found on Eskil Steenberg’s website
- (Hald CLUT author) at <a class="url" href="http://www.quelsolaar.com/technology/clut.html">http://www.quelsolaar.com/technology/clut.html</a>.
- </p>
- <a name="Commands-97"></a>
- <h4 class="subsection">39.114.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-97" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-97" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the <code class="code">interp</code> option as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Workflow-examples"></a>
- <h4 class="subsection">39.114.2 Workflow examples<span class="pull-right"><a class="anchor hidden-xs" href="#Workflow-examples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Workflow-examples" aria-hidden="true">TOC</a></span></h4>
- <a name="Hald-CLUT-video-stream"></a>
- <h4 class="subsubsection">39.114.2.1 Hald CLUT video stream<span class="pull-right"><a class="anchor hidden-xs" href="#Hald-CLUT-video-stream" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Hald-CLUT-video-stream" aria-hidden="true">TOC</a></span></h4>
- <p>Generate an identity Hald CLUT stream altered with various effects:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i <a class="ref" href="#haldclutsrc">haldclutsrc</a>=8 -vf "hue=H=2*PI*t:s=sin(2*PI*t)+1, curves=cross_process" -t 10 -c:v ffv1 clut.nut
- </pre></div>
- <p>Note: make sure you use a lossless codec.
- </p>
- <p>Then use it with <code class="code">haldclut</code> to apply it on some random stream:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i mandelbrot -i clut.nut -filter_complex '[0][1] haldclut' -t 20 mandelclut.mkv
- </pre></div>
- <p>The Hald CLUT will be applied to the 10 first seconds (duration of
- <samp class="file">clut.nut</samp>), then the latest picture of that CLUT stream will be applied
- to the remaining frames of the <code class="code">mandelbrot</code> stream.
- </p>
- <a name="Hald-CLUT-with-preview"></a>
- <h4 class="subsubsection">39.114.2.2 Hald CLUT with preview<span class="pull-right"><a class="anchor hidden-xs" href="#Hald-CLUT-with-preview" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Hald-CLUT-with-preview" aria-hidden="true">TOC</a></span></h4>
- <p>A Hald CLUT is supposed to be a squared image of <code class="code">Level*Level*Level</code> by
- <code class="code">Level*Level*Level</code> pixels. For a given Hald CLUT, FFmpeg will select the
- biggest possible square starting at the top left of the picture. The remaining
- padding pixels (bottom or right) will be ignored. This area can be used to add
- a preview of the Hald CLUT.
- </p>
- <p>Typically, the following generated Hald CLUT will be supported by the
- <code class="code">haldclut</code> filter:
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i <a class="ref" href="#haldclutsrc">haldclutsrc</a>=8 -vf "
- pad=iw+320 [padded_clut];
- smptebars=s=320x256, split [a][b];
- [padded_clut][a] overlay=W-320:h, curves=color_negative [main];
- [main][b] overlay=W-320" -frames:v 1 clut.png
- </pre></div>
- <p>It contains the original and a preview of the effect of the CLUT: SMPTE color
- bars are displayed on the right-top, and below the same color bars processed by
- the color changes.
- </p>
- <p>Then, the effect of this Hald CLUT can be visualized with:
- </p><div class="example">
- <pre class="example-preformatted">ffplay input.mkv -vf "movie=clut.png, [in] haldclut"
- </pre></div>
- <a name="hflip"></a>
- <h3 class="section">39.115 hflip<span class="pull-right"><a class="anchor hidden-xs" href="#hflip" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hflip" aria-hidden="true">TOC</a></span></h3>
- <p>Flip the input video horizontally.
- </p>
- <p>For example, to horizontally flip the input video with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -vf "hflip" out.avi
- </pre></div>
- <a name="histeq"></a>
- <h3 class="section">39.116 histeq<span class="pull-right"><a class="anchor hidden-xs" href="#histeq" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-histeq" aria-hidden="true">TOC</a></span></h3>
- <p>This filter applies a global color histogram equalization on a
- per-frame basis.
- </p>
- <p>It can be used to correct video that has a compressed range of pixel
- intensities. The filter redistributes the pixel intensities to
- equalize their distribution across the intensity range. It may be
- viewed as an "automatically adjusting contrast filter". This filter is
- useful only for correcting degraded or poorly captured source
- video.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Determine the amount of equalization to be applied. As the strength
- is reduced, the distribution of pixel intensities more-and-more
- approaches that of the input frame. The value must be a float number
- in the range [0,1] and defaults to 0.200.
- </p>
- </dd>
- <dt><samp class="option">intensity</samp></dt>
- <dd><p>Set the maximum intensity that can generated and scale the output
- values appropriately. The strength should be set as desired and then
- the intensity can be limited if needed to avoid washing-out. The value
- must be a float number in the range [0,1] and defaults to 0.210.
- </p>
- </dd>
- <dt><samp class="option">antibanding</samp></dt>
- <dd><p>Set the antibanding level. If enabled the filter will randomly vary
- the luminance of output pixels by a small amount to avoid banding of
- the histogram. Possible values are <code class="code">none</code>, <code class="code">weak</code> or
- <code class="code">strong</code>. It defaults to <code class="code">none</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="histogram"></a><a name="histogram-1"></a>
- <h3 class="section">39.117 histogram<span class="pull-right"><a class="anchor hidden-xs" href="#histogram-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-histogram-1" aria-hidden="true">TOC</a></span></h3>
- <p>Compute and draw a color distribution histogram for the input video.
- </p>
- <p>The computed histogram is a representation of the color component
- distribution in an image.
- </p>
- <p>Standard histogram displays the color components distribution in an image.
- Displays color graph for each color component. Shows distribution of
- the Y, U, V, A or R, G, B components, depending on input format, in the
- current frame. Below each graph a color component scale meter is shown.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">level_height</samp></dt>
- <dd><p>Set height of level. Default value is <code class="code">200</code>.
- Allowed range is [50, 2048].
- </p>
- </dd>
- <dt><samp class="option">scale_height</samp></dt>
- <dd><p>Set height of color scale. Default value is <code class="code">12</code>.
- Allowed range is [0, 40].
- </p>
- </dd>
- <dt><samp class="option">display_mode</samp></dt>
- <dd><p>Set display mode.
- It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">stack</samp>’</dt>
- <dd><p>Per color component graphs are placed below each other.
- </p>
- </dd>
- <dt>‘<samp class="samp">parade</samp>’</dt>
- <dd><p>Per color component graphs are placed side by side.
- </p>
- </dd>
- <dt>‘<samp class="samp">overlay</samp>’</dt>
- <dd><p>Presents information identical to that in the <code class="code">parade</code>, except
- that the graphs representing color components are superimposed directly
- over one another.
- </p></dd>
- </dl>
- <p>Default is <code class="code">stack</code>.
- </p>
- </dd>
- <dt><samp class="option">levels_mode</samp></dt>
- <dd><p>Set mode. Can be either <code class="code">linear</code>, or <code class="code">logarithmic</code>.
- Default is <code class="code">linear</code>.
- </p>
- </dd>
- <dt><samp class="option">components</samp></dt>
- <dd><p>Set what color components to display.
- Default is <code class="code">7</code>.
- </p>
- </dd>
- <dt><samp class="option">fgopacity</samp></dt>
- <dd><p>Set foreground opacity. Default is <code class="code">0.7</code>.
- </p>
- </dd>
- <dt><samp class="option">bgopacity</samp></dt>
- <dd><p>Set background opacity. Default is <code class="code">0.5</code>.
- </p>
- </dd>
- <dt><samp class="option">colors_mode</samp></dt>
- <dd><p>Set colors mode.
- It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">whiteonblack</samp>’</dt>
- <dt>‘<samp class="samp">blackonwhite</samp>’</dt>
- <dt>‘<samp class="samp">whiteongray</samp>’</dt>
- <dt>‘<samp class="samp">blackongray</samp>’</dt>
- <dt>‘<samp class="samp">coloronblack</samp>’</dt>
- <dt>‘<samp class="samp">coloronwhite</samp>’</dt>
- <dt>‘<samp class="samp">colorongray</samp>’</dt>
- <dt>‘<samp class="samp">blackoncolor</samp>’</dt>
- <dt>‘<samp class="samp">whiteoncolor</samp>’</dt>
- <dt>‘<samp class="samp">grayoncolor</samp>’</dt>
- </dl>
- <p>Default is <code class="code">whiteonblack</code>.
- </p></dd>
- </dl>
- <a name="Examples-131"></a>
- <h4 class="subsection">39.117.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-131" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-131" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Calculate and draw histogram:
- <div class="example">
- <pre class="example-preformatted">ffplay -i input -vf histogram
- </pre></div>
- </li></ul>
- <a class="anchor" id="hqdn3d"></a><a name="hqdn3d-1"></a>
- <h3 class="section">39.118 hqdn3d<span class="pull-right"><a class="anchor hidden-xs" href="#hqdn3d-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hqdn3d-1" aria-hidden="true">TOC</a></span></h3>
- <p>This is a high precision/quality 3d denoise filter. It aims to reduce
- image noise, producing smooth images and making still images really
- still. It should enhance compressibility.
- </p>
- <p>It accepts the following optional parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_spatial</samp></dt>
- <dd><p>A non-negative floating point number which specifies spatial luma strength.
- It defaults to 4.0.
- </p>
- </dd>
- <dt><samp class="option">chroma_spatial</samp></dt>
- <dd><p>A non-negative floating point number which specifies spatial chroma strength.
- It defaults to 3.0*<var class="var">luma_spatial</var>/4.0.
- </p>
- </dd>
- <dt><samp class="option">luma_tmp</samp></dt>
- <dd><p>A floating point number which specifies luma temporal strength. It defaults to
- 6.0*<var class="var">luma_spatial</var>/4.0.
- </p>
- </dd>
- <dt><samp class="option">chroma_tmp</samp></dt>
- <dd><p>A floating point number which specifies chroma temporal strength. It defaults to
- <var class="var">luma_tmp</var>*<var class="var">chroma_spatial</var>/<var class="var">luma_spatial</var>.
- </p></dd>
- </dl>
- <a name="Commands-98"></a>
- <h4 class="subsection">39.118.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-98" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-98" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a class="anchor" id="hwdownload"></a><a name="hwdownload-1"></a>
- <h3 class="section">39.119 hwdownload<span class="pull-right"><a class="anchor hidden-xs" href="#hwdownload-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hwdownload-1" aria-hidden="true">TOC</a></span></h3>
- <p>Download hardware frames to system memory.
- </p>
- <p>The input must be in hardware frames, and the output a non-hardware format.
- Not all formats will be supported on the output - it may be necessary to insert
- an additional <samp class="option">format</samp> filter immediately following in the graph to get
- the output in a supported format.
- </p>
- <a name="hwmap"></a>
- <h3 class="section">39.120 hwmap<span class="pull-right"><a class="anchor hidden-xs" href="#hwmap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hwmap" aria-hidden="true">TOC</a></span></h3>
- <p>Map hardware frames to system memory or to another device.
- </p>
- <p>This filter has several different modes of operation; which one is used depends
- on the input and output formats:
- </p><ul class="itemize mark-bullet">
- <li>Hardware frame input, normal frame output
- <p>Map the input frames to system memory and pass them to the output. If the
- original hardware frame is later required (for example, after overlaying
- something else on part of it), the <samp class="option">hwmap</samp> filter can be used again
- in the next mode to retrieve it.
- </p></li><li>Normal frame input, hardware frame output
- <p>If the input is actually a software-mapped hardware frame, then unmap it -
- that is, return the original hardware frame.
- </p>
- <p>Otherwise, a device must be provided. Create new hardware surfaces on that
- device for the output, then map them back to the software format at the input
- and give those frames to the preceding filter. This will then act like the
- <samp class="option">hwupload</samp> filter, but may be able to avoid an additional copy when
- the input is already in a compatible format.
- </p></li><li>Hardware frame input and output
- <p>A device must be supplied for the output, either directly or with the
- <samp class="option">derive_device</samp> option. The input and output devices must be of
- different types and compatible - the exact meaning of this is
- system-dependent, but typically it means that they must refer to the same
- underlying hardware context (for example, refer to the same graphics card).
- </p>
- <p>If the input frames were originally created on the output device, then unmap
- to retrieve the original frames.
- </p>
- <p>Otherwise, map the frames to the output device - create new hardware frames
- on the output corresponding to the frames on the input.
- </p></li></ul>
- <p>The following additional parameters are accepted:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the frame mapping mode. Some combination of:
- </p><dl class="table">
- <dt><var class="var">read</var></dt>
- <dd><p>The mapped frame should be readable.
- </p></dd>
- <dt><var class="var">write</var></dt>
- <dd><p>The mapped frame should be writeable.
- </p></dd>
- <dt><var class="var">overwrite</var></dt>
- <dd><p>The mapping will always overwrite the entire frame.
- </p>
- <p>This may improve performance in some cases, as the original contents of the
- frame need not be loaded.
- </p></dd>
- <dt><var class="var">direct</var></dt>
- <dd><p>The mapping must not involve any copying.
- </p>
- <p>Indirect mappings to copies of frames are created in some cases where either
- direct mapping is not possible or it would have unexpected properties.
- Setting this flag ensures that the mapping is direct and will fail if that is
- not possible.
- </p></dd>
- </dl>
- <p>Defaults to <var class="var">read+write</var> if not specified.
- </p>
- </dd>
- <dt><samp class="option">derive_device <var class="var">type</var></samp></dt>
- <dd><p>Rather than using the device supplied at initialisation, instead derive a new
- device of type <var class="var">type</var> from the device the input frames exist on.
- </p>
- </dd>
- <dt><samp class="option">reverse</samp></dt>
- <dd><p>In a hardware to hardware mapping, map in reverse - create frames in the sink
- and map them back to the source. This may be necessary in some cases where
- a mapping in one direction is required but only the opposite direction is
- supported by the devices being used.
- </p>
- <p>This option is dangerous - it may break the preceding filter in undefined
- ways if there are any additional constraints on that filter’s output.
- Do not use it without fully understanding the implications of its use.
- </p></dd>
- </dl>
- <a class="anchor" id="hwupload"></a><a name="hwupload-1"></a>
- <h3 class="section">39.121 hwupload<span class="pull-right"><a class="anchor hidden-xs" href="#hwupload-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hwupload-1" aria-hidden="true">TOC</a></span></h3>
- <p>Upload system memory frames to hardware surfaces.
- </p>
- <p>The device to upload to must be supplied when the filter is initialised. If
- using ffmpeg, select the appropriate device with the <samp class="option">-filter_hw_device</samp>
- option or with the <samp class="option">derive_device</samp> option. The input and output devices
- must be of different types and compatible - the exact meaning of this is
- system-dependent, but typically it means that they must refer to the same
- underlying hardware context (for example, refer to the same graphics card).
- </p>
- <p>The following additional parameters are accepted:
- </p>
- <dl class="table">
- <dt><samp class="option">derive_device <var class="var">type</var></samp></dt>
- <dd><p>Rather than using the device supplied at initialisation, instead derive a new
- device of type <var class="var">type</var> from the device the input frames exist on.
- </p></dd>
- </dl>
- <a class="anchor" id="hwupload_005fcuda"></a><a name="hwupload_005fcuda-1"></a>
- <h3 class="section">39.122 hwupload_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#hwupload_005fcuda-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hwupload_005fcuda-1" aria-hidden="true">TOC</a></span></h3>
- <p>Upload system memory frames to a CUDA device.
- </p>
- <p>It accepts the following optional parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">device</samp></dt>
- <dd><p>The number of the CUDA device to use
- </p></dd>
- </dl>
- <a name="hqx"></a>
- <h3 class="section">39.123 hqx<span class="pull-right"><a class="anchor hidden-xs" href="#hqx" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hqx" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a high-quality magnification filter designed for pixel art. This filter
- was originally created by Maxim Stepin.
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the scaling dimension: <code class="code">2</code> for <code class="code">hq2x</code>, <code class="code">3</code> for
- <code class="code">hq3x</code> and <code class="code">4</code> for <code class="code">hq4x</code>.
- Default is <code class="code">3</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="hstack"></a><a name="hstack-1"></a>
- <h3 class="section">39.124 hstack<span class="pull-right"><a class="anchor hidden-xs" href="#hstack-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hstack-1" aria-hidden="true">TOC</a></span></h3>
- <p>Stack input videos horizontally.
- </p>
- <p>All streams must be of same pixel format and of same height.
- </p>
- <p>Note that this filter is faster than using <a class="ref" href="#overlay">overlay</a> and <a class="ref" href="#pad">pad</a> filter
- to create same output.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set number of input streams. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>If set to 1, force the output to terminate when the shortest input
- terminates. Default value is 0.
- </p></dd>
- </dl>
- <a name="hsvhold"></a>
- <h3 class="section">39.125 hsvhold<span class="pull-right"><a class="anchor hidden-xs" href="#hsvhold" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hsvhold" aria-hidden="true">TOC</a></span></h3>
- <p>Turns a certain HSV range into gray values.
- </p>
- <p>This filter measures color difference between set HSV color in options
- and ones measured in video stream. Depending on options, output
- colors can be changed to be gray or not.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">hue</samp></dt>
- <dd><p>Set the hue value which will be used in color difference calculation.
- Allowed range is from -360 to 360. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">sat</samp></dt>
- <dd><p>Set the saturation value which will be used in color difference calculation.
- Allowed range is from -1 to 1. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">val</samp></dt>
- <dd><p>Set the value which will be used in color difference calculation.
- Allowed range is from -1 to 1. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Set similarity percentage with the key color.
- Allowed range is from 0 to 1. Default value is 0.01.
- </p>
- <p>0.00001 matches only the exact key color, while 1.0 matches everything.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Blend percentage.
- Allowed range is from 0 to 1. Default value is 0.
- </p>
- <p>0.0 makes pixels either fully gray, or not gray at all.
- </p>
- <p>Higher values result in more gray pixels, with a higher gray pixel
- the more similar the pixels color is to the key color.
- </p></dd>
- </dl>
- <a name="hsvkey"></a>
- <h3 class="section">39.126 hsvkey<span class="pull-right"><a class="anchor hidden-xs" href="#hsvkey" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hsvkey" aria-hidden="true">TOC</a></span></h3>
- <p>Turns a certain HSV range into transparency.
- </p>
- <p>This filter measures color difference between set HSV color in options
- and ones measured in video stream. Depending on options, output
- colors can be changed to transparent by adding alpha channel.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">hue</samp></dt>
- <dd><p>Set the hue value which will be used in color difference calculation.
- Allowed range is from -360 to 360. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">sat</samp></dt>
- <dd><p>Set the saturation value which will be used in color difference calculation.
- Allowed range is from -1 to 1. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">val</samp></dt>
- <dd><p>Set the value which will be used in color difference calculation.
- Allowed range is from -1 to 1. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Set similarity percentage with the key color.
- Allowed range is from 0 to 1. Default value is 0.01.
- </p>
- <p>0.00001 matches only the exact key color, while 1.0 matches everything.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Blend percentage.
- Allowed range is from 0 to 1. Default value is 0.
- </p>
- <p>0.0 makes pixels either fully transparent, or not transparent at all.
- </p>
- <p>Higher values result in semi-transparent pixels, with a higher transparency
- the more similar the pixels color is to the key color.
- </p></dd>
- </dl>
- <a name="hue"></a>
- <h3 class="section">39.127 hue<span class="pull-right"><a class="anchor hidden-xs" href="#hue" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hue" aria-hidden="true">TOC</a></span></h3>
- <p>Modify the hue and/or the saturation of the input.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">h</samp></dt>
- <dd><p>Specify the hue angle as a number of degrees. It accepts an expression,
- and defaults to "0".
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>Specify the saturation in the [-10,10] range. It accepts an expression and
- defaults to "1".
- </p>
- </dd>
- <dt><samp class="option">H</samp></dt>
- <dd><p>Specify the hue angle as a number of radians. It accepts an
- expression, and defaults to "0".
- </p>
- </dd>
- <dt><samp class="option">b</samp></dt>
- <dd><p>Specify the brightness in the [-10,10] range. It accepts an expression and
- defaults to "0".
- </p></dd>
- </dl>
- <p><samp class="option">h</samp> and <samp class="option">H</samp> are mutually exclusive, and can’t be
- specified at the same time.
- </p>
- <p>The <samp class="option">b</samp>, <samp class="option">h</samp>, <samp class="option">H</samp> and <samp class="option">s</samp> option values are
- expressions containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>frame count of the input frame starting from 0
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>presentation timestamp of the input frame expressed in time base units
- </p>
- </dd>
- <dt><samp class="option">r</samp></dt>
- <dd><p>frame rate of the input video, NAN if the input frame rate is unknown
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>timestamp expressed in seconds, NAN if the input timestamp is unknown
- </p>
- </dd>
- <dt><samp class="option">tb</samp></dt>
- <dd><p>time base of the input video
- </p></dd>
- </dl>
- <a name="Examples-132"></a>
- <h4 class="subsection">39.127.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-132" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-132" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Set the hue to 90 degrees and the saturation to 1.0:
- <div class="example">
- <pre class="example-preformatted">hue=h=90:s=1
- </pre></div>
- </li><li>Same command but expressing the hue in radians:
- <div class="example">
- <pre class="example-preformatted">hue=H=PI/2:s=1
- </pre></div>
- </li><li>Rotate hue and make the saturation swing between 0
- and 2 over a period of 1 second:
- <div class="example">
- <pre class="example-preformatted">hue="H=2*PI*t: s=sin(2*PI*t)+1"
- </pre></div>
- </li><li>Apply a 3 seconds saturation fade-in effect starting at 0:
- <div class="example">
- <pre class="example-preformatted">hue="s=min(t/3\,1)"
- </pre></div>
- <p>The general fade-in expression can be written as:
- </p><div class="example">
- <pre class="example-preformatted">hue="s=min(0\, max((t-START)/DURATION\, 1))"
- </pre></div>
- </li><li>Apply a 3 seconds saturation fade-out effect starting at 5 seconds:
- <div class="example">
- <pre class="example-preformatted">hue="s=max(0\, min(1\, (8-t)/3))"
- </pre></div>
- <p>The general fade-out expression can be written as:
- </p><div class="example">
- <pre class="example-preformatted">hue="s=max(0\, min(1\, (START+DURATION-t)/DURATION))"
- </pre></div>
- </li></ul>
- <a name="Commands-99"></a>
- <h4 class="subsection">39.127.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-99" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-99" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">b</samp></dt>
- <dt><samp class="option">s</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dt><samp class="option">H</samp></dt>
- <dd><p>Modify the hue and/or the saturation and/or brightness of the input video.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="huesaturation"></a>
- <h3 class="section">39.128 huesaturation<span class="pull-right"><a class="anchor hidden-xs" href="#huesaturation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-huesaturation" aria-hidden="true">TOC</a></span></h3>
- <p>Apply hue-saturation-intensity adjustments to input video stream.
- </p>
- <p>This filter operates in RGB colorspace.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">hue</samp></dt>
- <dd><p>Set the hue shift in degrees to apply. Default is 0.
- Allowed range is from -180 to 180.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set the saturation shift. Default is 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">intensity</samp></dt>
- <dd><p>Set the intensity shift. Default is 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">colors</samp></dt>
- <dd><p>Set which primary and complementary colors are going to be adjusted.
- This options is set by providing one or multiple values.
- This can select multiple colors at once. By default all colors are selected.
- </p><dl class="table">
- <dt>‘<samp class="samp">r</samp>’</dt>
- <dd><p>Adjust reds.
- </p></dd>
- <dt>‘<samp class="samp">y</samp>’</dt>
- <dd><p>Adjust yellows.
- </p></dd>
- <dt>‘<samp class="samp">g</samp>’</dt>
- <dd><p>Adjust greens.
- </p></dd>
- <dt>‘<samp class="samp">c</samp>’</dt>
- <dd><p>Adjust cyans.
- </p></dd>
- <dt>‘<samp class="samp">b</samp>’</dt>
- <dd><p>Adjust blues.
- </p></dd>
- <dt>‘<samp class="samp">m</samp>’</dt>
- <dd><p>Adjust magentas.
- </p></dd>
- <dt>‘<samp class="samp">a</samp>’</dt>
- <dd><p>Adjust all colors.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Set strength of filtering. Allowed range is from 0 to 100.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">rw, gw, bw</samp></dt>
- <dd><p>Set weight for each RGB component. Allowed range is from 0 to 1.
- By default is set to 0.333, 0.334, 0.333.
- Those options are used in saturation and lightess processing.
- </p>
- </dd>
- <dt><samp class="option">lightness</samp></dt>
- <dd><p>Set preserving lightness, by default is disabled.
- Adjusting hues can change lightness from original RGB triplet,
- with this option enabled lightness is kept at same value.
- </p></dd>
- </dl>
- <a name="hysteresis"></a>
- <h3 class="section">39.129 hysteresis<span class="pull-right"><a class="anchor hidden-xs" href="#hysteresis" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hysteresis" aria-hidden="true">TOC</a></span></h3>
- <p>Grow first stream into second stream by connecting components.
- This makes it possible to build more robust edge masks.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed as bitmap, unprocessed planes will be
- copied from first stream.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set threshold which is used in filtering. If pixel component value is higher than
- this value filter algorithm for connecting components is activated.
- By default value is 0.
- </p></dd>
- </dl>
- <p>The <code class="code">hysteresis</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="iccdetect"></a>
- <h3 class="section">39.130 iccdetect<span class="pull-right"><a class="anchor hidden-xs" href="#iccdetect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-iccdetect" aria-hidden="true">TOC</a></span></h3>
- <p>Detect the colorspace from an embedded ICC profile (if present), and update
- the frame’s tags accordingly.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">force</samp></dt>
- <dd><p>If true, the frame’s existing colorspace tags will always be overridden by
- values detected from an ICC profile. Otherwise, they will only be assigned if
- they contain <code class="code">unknown</code>. Enabled by default.
- </p></dd>
- </dl>
- <a name="iccgen"></a>
- <h3 class="section">39.131 iccgen<span class="pull-right"><a class="anchor hidden-xs" href="#iccgen" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-iccgen" aria-hidden="true">TOC</a></span></h3>
- <p>Generate ICC profiles and attach them to frames.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">color_primaries</samp></dt>
- <dt><samp class="option">color_trc</samp></dt>
- <dd><p>Configure the colorspace that the ICC profile will be generated for. The
- default value of <code class="code">auto</code> infers the value from the input frame’s metadata,
- defaulting to BT.709/sRGB as appropriate.
- </p>
- <p>See the <a class="ref" href="#setparams">setparams</a> filter for a list of possible values, but note that
- <code class="code">unknown</code> are not valid values for this filter.
- </p>
- </dd>
- <dt><samp class="option">force</samp></dt>
- <dd><p>If true, an ICC profile will be generated even if it would overwrite an
- already existing ICC profile. Disabled by default.
- </p></dd>
- </dl>
- <a name="identity"></a>
- <h3 class="section">39.132 identity<span class="pull-right"><a class="anchor hidden-xs" href="#identity" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-identity" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the identity score between two input videos.
- </p>
- <p>This filter takes two input videos.
- </p>
- <p>Both input videos must have the same resolution and pixel format for
- this filter to work correctly. Also it assumes that both inputs
- have the same number of frames, which are compared one by one.
- </p>
- <p>The obtained per component, average, min and max identity score is printed through
- the logging system.
- </p>
- <p>The filter stores the calculated identity scores of each frame in frame metadata.
- </p>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>In the below example the input file <samp class="file">main.mpg</samp> being processed is compared
- with the reference file <samp class="file">ref.mpg</samp>.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mpg -lavfi identity -f null -
- </pre></div>
- <a name="idet"></a>
- <h3 class="section">39.133 idet<span class="pull-right"><a class="anchor hidden-xs" href="#idet" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-idet" aria-hidden="true">TOC</a></span></h3>
- <p>Detect video interlacing type.
- </p>
- <p>This filter tries to detect if the input frames are interlaced, progressive,
- top or bottom field first. It will also try to detect fields that are
- repeated between adjacent frames (a sign of telecine).
- </p>
- <p>Single frame detection considers only immediately adjacent frames when classifying each frame.
- Multiple frame detection incorporates the classification history of previous frames.
- </p>
- <p>The filter will log these metadata values:
- </p>
- <dl class="table">
- <dt><samp class="option">single.current_frame</samp></dt>
- <dd><p>Detected type of current frame using single-frame detection. One of:
- “tff” (top field first), “bff” (bottom field first),
- “progressive”, or “undetermined”
- </p>
- </dd>
- <dt><samp class="option">single.tff</samp></dt>
- <dd><p>Cumulative number of frames detected as top field first using single-frame detection.
- </p>
- </dd>
- <dt><samp class="option">multiple.tff</samp></dt>
- <dd><p>Cumulative number of frames detected as top field first using multiple-frame detection.
- </p>
- </dd>
- <dt><samp class="option">single.bff</samp></dt>
- <dd><p>Cumulative number of frames detected as bottom field first using single-frame detection.
- </p>
- </dd>
- <dt><samp class="option">multiple.current_frame</samp></dt>
- <dd><p>Detected type of current frame using multiple-frame detection. One of:
- “tff” (top field first), “bff” (bottom field first),
- “progressive”, or “undetermined”
- </p>
- </dd>
- <dt><samp class="option">multiple.bff</samp></dt>
- <dd><p>Cumulative number of frames detected as bottom field first using multiple-frame detection.
- </p>
- </dd>
- <dt><samp class="option">single.progressive</samp></dt>
- <dd><p>Cumulative number of frames detected as progressive using single-frame detection.
- </p>
- </dd>
- <dt><samp class="option">multiple.progressive</samp></dt>
- <dd><p>Cumulative number of frames detected as progressive using multiple-frame detection.
- </p>
- </dd>
- <dt><samp class="option">single.undetermined</samp></dt>
- <dd><p>Cumulative number of frames that could not be classified using single-frame detection.
- </p>
- </dd>
- <dt><samp class="option">multiple.undetermined</samp></dt>
- <dd><p>Cumulative number of frames that could not be classified using multiple-frame detection.
- </p>
- </dd>
- <dt><samp class="option">repeated.current_frame</samp></dt>
- <dd><p>Which field in the current frame is repeated from the last. One of “neither”, “top”, or “bottom”.
- </p>
- </dd>
- <dt><samp class="option">repeated.neither</samp></dt>
- <dd><p>Cumulative number of frames with no repeated field.
- </p>
- </dd>
- <dt><samp class="option">repeated.top</samp></dt>
- <dd><p>Cumulative number of frames with the top field repeated from the previous frame’s top field.
- </p>
- </dd>
- <dt><samp class="option">repeated.bottom</samp></dt>
- <dd><p>Cumulative number of frames with the bottom field repeated from the previous frame’s bottom field.
- </p></dd>
- </dl>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">intl_thres</samp></dt>
- <dd><p>Set interlacing threshold.
- </p></dd>
- <dt><samp class="option">prog_thres</samp></dt>
- <dd><p>Set progressive threshold.
- </p></dd>
- <dt><samp class="option">rep_thres</samp></dt>
- <dd><p>Threshold for repeated field detection.
- </p></dd>
- <dt><samp class="option">half_life</samp></dt>
- <dd><p>Number of frames after which a given frame’s contribution to the
- statistics is halved (i.e., it contributes only 0.5 to its
- classification). The default of 0 means that all frames seen are given
- full weight of 1.0 forever.
- </p></dd>
- <dt><samp class="option">analyze_interlaced_flag</samp></dt>
- <dd><p>When this is not 0 then idet will use the specified number of frames to determine
- if the interlaced flag is accurate, it will not count undetermined frames.
- If the flag is found to be accurate it will be used without any further
- computations, if it is found to be inaccurate it will be cleared without any
- further computations. This allows inserting the idet filter as a low computational
- method to clean up the interlaced flag
- </p></dd>
- </dl>
- <a name="Examples-133"></a>
- <h4 class="subsection">39.133.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-133" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-133" aria-hidden="true">TOC</a></span></h4>
- <p>Inspect the field order of the first 360 frames in a video, in verbose detail:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -filter:v idet,metadata=mode=print -frames:v 360 -an -f null -
- </pre></div>
- <p>The idet filter will add analysis metadata to each frame, which will then be
- discarded. At the end, the filter will also print a final report with statistics.
- </p>
- <a name="il"></a>
- <h3 class="section">39.134 il<span class="pull-right"><a class="anchor hidden-xs" href="#il" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-il" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterleave or interleave fields.
- </p>
- <p>This filter allows one to process interlaced images fields without
- deinterlacing them. Deinterleaving splits the input frame into 2
- fields (so called half pictures). Odd lines are moved to the top
- half of the output image, even lines to the bottom half.
- You can process (filter) them independently and then re-interleave them.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_mode, l</samp></dt>
- <dt><samp class="option">chroma_mode, c</samp></dt>
- <dt><samp class="option">alpha_mode, a</samp></dt>
- <dd><p>Available values for <var class="var">luma_mode</var>, <var class="var">chroma_mode</var> and
- <var class="var">alpha_mode</var> are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Do nothing.
- </p>
- </dd>
- <dt>‘<samp class="samp">deinterleave, d</samp>’</dt>
- <dd><p>Deinterleave fields, placing one above the other.
- </p>
- </dd>
- <dt>‘<samp class="samp">interleave, i</samp>’</dt>
- <dd><p>Interleave fields. Reverse the effect of deinterleaving.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">none</code>.
- </p>
- </dd>
- <dt><samp class="option">luma_swap, ls</samp></dt>
- <dt><samp class="option">chroma_swap, cs</samp></dt>
- <dt><samp class="option">alpha_swap, as</samp></dt>
- <dd><p>Swap luma/chroma/alpha fields. Exchange even & odd lines. Default value is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="Commands-100"></a>
- <h4 class="subsection">39.134.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-100" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-100" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="inflate"></a>
- <h3 class="section">39.135 inflate<span class="pull-right"><a class="anchor hidden-xs" href="#inflate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-inflate" aria-hidden="true">TOC</a></span></h3>
- <p>Apply inflate effect to the video.
- </p>
- <p>This filter replaces the pixel by the local(3x3) average by taking into account
- only values higher than the pixel.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold0</samp></dt>
- <dt><samp class="option">threshold1</samp></dt>
- <dt><samp class="option">threshold2</samp></dt>
- <dt><samp class="option">threshold3</samp></dt>
- <dd><p>Limit the maximum change for each plane, default is 65535.
- If 0, plane will remain unchanged.
- </p></dd>
- </dl>
- <a name="Commands-101"></a>
- <h4 class="subsection">39.135.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-101" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-101" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="interlace_002c-interlace_005fvulkan"></a>
- <h3 class="section">39.136 interlace, interlace_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#interlace_002c-interlace_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-interlace_002c-interlace_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Simple interlacing filter from progressive contents. This interleaves upper (or
- lower) lines from odd frames with lower (or upper) lines from even frames,
- halving the frame rate and preserving image height.
- </p>
- <div class="example">
- <pre class="example-preformatted"> Original Original New Frame
- Frame 'j' Frame 'j+1' (tff)
- ========== =========== ==================
- Line 0 --------------------> Frame 'j' Line 0
- Line 1 Line 1 ----> Frame 'j+1' Line 1
- Line 2 ---------------------> Frame 'j' Line 2
- Line 3 Line 3 ----> Frame 'j+1' Line 3
- ... ... ...
- New Frame + 1 will be generated by Frame 'j+2' and Frame 'j+3' and so on
- </pre></div>
- <p>It accepts the following optional parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">scan</samp></dt>
- <dd><p>This determines whether the interlaced frame is taken from the even
- (tff - default) or odd (bff) lines of the progressive frame.
- </p>
- </dd>
- <dt><samp class="option">lowpass</samp></dt>
- <dd><p>Vertical lowpass filter to avoid twitter interlacing and
- reduce moire patterns.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">0, off</samp>’</dt>
- <dd><p>Disable vertical lowpass filter
- </p>
- </dd>
- <dt>‘<samp class="samp">1, linear</samp>’</dt>
- <dd><p>Enable linear filter (default)
- </p>
- </dd>
- <dt>‘<samp class="samp">2, complex</samp>’</dt>
- <dd><p>Enable complex filter. This will slightly less reduce twitter and moire
- but better retain detail and subjective sharpness impression.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="kerndeint"></a>
- <h3 class="section">39.137 kerndeint<span class="pull-right"><a class="anchor hidden-xs" href="#kerndeint" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-kerndeint" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlace input video by applying Donald Graft’s adaptive kernel
- deinterling. Work on interlaced parts of a video to produce
- progressive frames.
- </p>
- <p>The description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">thresh</samp></dt>
- <dd><p>Set the threshold which affects the filter’s tolerance when
- determining if a pixel line must be processed. It must be an integer
- in the range [0,255] and defaults to 10. A value of 0 will result in
- applying the process on every pixels.
- </p>
- </dd>
- <dt><samp class="option">map</samp></dt>
- <dd><p>Paint pixels exceeding the threshold value to white if set to 1.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">order</samp></dt>
- <dd><p>Set the fields order. Swap fields if set to 1, leave fields alone if
- 0. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">sharp</samp></dt>
- <dd><p>Enable additional sharpening if set to 1. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">twoway</samp></dt>
- <dd><p>Enable twoway sharpening if set to 1. Default is 0.
- </p></dd>
- </dl>
- <a name="Examples-134"></a>
- <h4 class="subsection">39.137.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-134" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-134" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply default values:
- <div class="example">
- <pre class="example-preformatted">kerndeint=thresh=10:map=0:order=0:sharp=0:twoway=0
- </pre></div>
- </li><li>Enable additional sharpening:
- <div class="example">
- <pre class="example-preformatted">kerndeint=sharp=1
- </pre></div>
- </li><li>Paint processed pixels in white:
- <div class="example">
- <pre class="example-preformatted">kerndeint=map=1
- </pre></div>
- </li></ul>
- <a name="kirsch"></a>
- <h3 class="section">39.138 kirsch<span class="pull-right"><a class="anchor hidden-xs" href="#kirsch" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-kirsch" aria-hidden="true">TOC</a></span></h3>
- <p>Apply kirsch operator to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- </p></dd>
- </dl>
- <a name="Commands-102"></a>
- <h4 class="subsection">39.138.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-102" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-102" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="lagfun"></a>
- <h3 class="section">39.139 lagfun<span class="pull-right"><a class="anchor hidden-xs" href="#lagfun" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lagfun" aria-hidden="true">TOC</a></span></h3>
- <p>Slowly update darker pixels.
- </p>
- <p>This filter makes short flashes of light appear longer.
- This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">decay</samp></dt>
- <dd><p>Set factor for decaying. Default is .95. Allowed range is from 0 to 1.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default is all. Allowed range is from 0 to 15.
- </p></dd>
- </dl>
- <a name="Commands-103"></a>
- <h4 class="subsection">39.139.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-103" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-103" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="lenscorrection"></a>
- <h3 class="section">39.140 lenscorrection<span class="pull-right"><a class="anchor hidden-xs" href="#lenscorrection" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lenscorrection" aria-hidden="true">TOC</a></span></h3>
- <p>Correct radial lens distortion
- </p>
- <p>This filter can be used to correct for radial distortion as can result from the use
- of wide angle lenses, and thereby re-rectify the image. To find the right parameters
- one can use tools available for example as part of opencv or simply trial-and-error.
- To use opencv use the calibration sample (under samples/cpp) from the opencv sources
- and extract the k1 and k2 coefficients from the resulting matrix.
- </p>
- <p>Note that effectively the same filter is available in the open-source tools Krita and
- Digikam from the KDE project.
- </p>
- <p>In contrast to the <a class="ref" href="#vignette">vignette</a> filter, which can also be used to compensate lens errors,
- this filter corrects the distortion of the image, whereas <a class="ref" href="#vignette">vignette</a> corrects the
- brightness distribution, so you may want to use both filters together in certain
- cases, though you will have to take care of ordering, i.e. whether vignetting should
- be applied before or after lens correction.
- </p>
- <a name="Options-120"></a>
- <h4 class="subsection">39.140.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-120" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-120" aria-hidden="true">TOC</a></span></h4>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">cx</samp></dt>
- <dd><p>Relative x-coordinate of the focal point of the image, and thereby the center of the
- distortion. This value has a range [0,1] and is expressed as fractions of the image
- width. Default is 0.5.
- </p></dd>
- <dt><samp class="option">cy</samp></dt>
- <dd><p>Relative y-coordinate of the focal point of the image, and thereby the center of the
- distortion. This value has a range [0,1] and is expressed as fractions of the image
- height. Default is 0.5.
- </p></dd>
- <dt><samp class="option">k1</samp></dt>
- <dd><p>Coefficient of the quadratic correction term. This value has a range [-1,1]. 0 means
- no correction. Default is 0.
- </p></dd>
- <dt><samp class="option">k2</samp></dt>
- <dd><p>Coefficient of the double quadratic correction term. This value has a range [-1,1].
- 0 means no correction. Default is 0.
- </p></dd>
- <dt><samp class="option">i</samp></dt>
- <dd><p>Set interpolation type. Can be <code class="code">nearest</code> or <code class="code">bilinear</code>.
- Default is <code class="code">nearest</code>.
- </p></dd>
- <dt><samp class="option">fc</samp></dt>
- <dd><p>Specify the color of the unmapped pixels. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>. Default color is <code class="code">black@0</code>.
- </p></dd>
- </dl>
- <p>The formula that generates the correction is:
- </p>
- <p><var class="var">r_src</var> = <var class="var">r_tgt</var> * (1 + <var class="var">k1</var> * (<var class="var">r_tgt</var> / <var class="var">r_0</var>)^2 + <var class="var">k2</var> * (<var class="var">r_tgt</var> / <var class="var">r_0</var>)^4)
- </p>
- <p>where <var class="var">r_0</var> is halve of the image diagonal and <var class="var">r_src</var> and <var class="var">r_tgt</var> are the
- distances from the focal point in the source and target images, respectively.
- </p>
- <a name="Commands-104"></a>
- <h4 class="subsection">39.140.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-104" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-104" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="lensfun"></a>
- <h3 class="section">39.141 lensfun<span class="pull-right"><a class="anchor hidden-xs" href="#lensfun" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lensfun" aria-hidden="true">TOC</a></span></h3>
- <p>Apply lens correction via the lensfun library (<a class="url" href="http://lensfun.sourceforge.net/">http://lensfun.sourceforge.net/</a>).
- </p>
- <p>The <code class="code">lensfun</code> filter requires the camera make, camera model, and lens model
- to apply the lens correction. The filter will load the lensfun database and
- query it to find the corresponding camera and lens entries in the database. As
- long as these entries can be found with the given options, the filter can
- perform corrections on frames. Note that incomplete strings will result in the
- filter choosing the best match with the given options, and the filter will
- output the chosen camera and lens models (logged with level "info"). You must
- provide the make, camera model, and lens model as they are required.
- </p>
- <p>To obtain a list of available makes and models, leave out one or both of <code class="code">make</code> and
- <code class="code">model</code> options. The filter will send the full list to the log with level <code class="code">INFO</code>.
- The first column is the make and the second column is the model.
- To obtain a list of available lenses, set any values for make and model and leave out the
- <code class="code">lens_model</code> option. The filter will send the full list of lenses in the log with level
- <code class="code">INFO</code>. The ffmpeg tool will exit after the list is printed.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">make</samp></dt>
- <dd><p>The make of the camera (for example, "Canon"). This option is required.
- </p>
- </dd>
- <dt><samp class="option">model</samp></dt>
- <dd><p>The model of the camera (for example, "Canon EOS 100D"). This option is
- required.
- </p>
- </dd>
- <dt><samp class="option">lens_model</samp></dt>
- <dd><p>The model of the lens (for example, "Canon EF-S 18-55mm f/3.5-5.6 IS STM"). This
- option is required.
- </p>
- </dd>
- <dt><samp class="option">db_path</samp></dt>
- <dd><p>The full path to the lens database folder. If not set, the filter will attempt to
- load the database from the install path when the library was built. Default is unset.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The type of correction to apply. The following values are valid options:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">vignetting</samp>’</dt>
- <dd><p>Enables fixing lens vignetting.
- </p>
- </dd>
- <dt>‘<samp class="samp">geometry</samp>’</dt>
- <dd><p>Enables fixing lens geometry. This is the default.
- </p>
- </dd>
- <dt>‘<samp class="samp">subpixel</samp>’</dt>
- <dd><p>Enables fixing chromatic aberrations.
- </p>
- </dd>
- <dt>‘<samp class="samp">vig_geo</samp>’</dt>
- <dd><p>Enables fixing lens vignetting and lens geometry.
- </p>
- </dd>
- <dt>‘<samp class="samp">vig_subpixel</samp>’</dt>
- <dd><p>Enables fixing lens vignetting and chromatic aberrations.
- </p>
- </dd>
- <dt>‘<samp class="samp">distortion</samp>’</dt>
- <dd><p>Enables fixing both lens geometry and chromatic aberrations.
- </p>
- </dd>
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>Enables all possible corrections.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">focal_length</samp></dt>
- <dd><p>The focal length of the image/video (zoom; expected constant for video). For
- example, a 18–55mm lens has focal length range of [18–55], so a value in that
- range should be chosen when using that lens. Default 18.
- </p>
- </dd>
- <dt><samp class="option">aperture</samp></dt>
- <dd><p>The aperture of the image/video (expected constant for video). Note that
- aperture is only used for vignetting correction. Default 3.5.
- </p>
- </dd>
- <dt><samp class="option">focus_distance</samp></dt>
- <dd><p>The focus distance of the image/video (expected constant for video). Note that
- focus distance is only used for vignetting and only slightly affects the
- vignetting correction process. If unknown, leave it at the default value (which
- is 1000).
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>The scale factor which is applied after transformation. After correction the
- video is no longer necessarily rectangular. This parameter controls how much of
- the resulting image is visible. The value 0 means that a value will be chosen
- automatically such that there is little or no unmapped area in the output
- image. 1.0 means that no additional scaling is done. Lower values may result
- in more of the corrected image being visible, while higher values may avoid
- unmapped areas in the output.
- </p>
- </dd>
- <dt><samp class="option">target_geometry</samp></dt>
- <dd><p>The target geometry of the output image/video. The following values are valid
- options:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">rectilinear (default)</samp>’</dt>
- <dt>‘<samp class="samp">fisheye</samp>’</dt>
- <dt>‘<samp class="samp">panoramic</samp>’</dt>
- <dt>‘<samp class="samp">equirectangular</samp>’</dt>
- <dt>‘<samp class="samp">fisheye_orthographic</samp>’</dt>
- <dt>‘<samp class="samp">fisheye_stereographic</samp>’</dt>
- <dt>‘<samp class="samp">fisheye_equisolid</samp>’</dt>
- <dt>‘<samp class="samp">fisheye_thoby</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">reverse</samp></dt>
- <dd><p>Apply the reverse of image correction (instead of correcting distortion, apply
- it).
- </p>
- </dd>
- <dt><samp class="option">interpolation</samp></dt>
- <dd><p>The type of interpolation used when correcting distortion. The following values
- are valid options:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">nearest</samp>’</dt>
- <dt>‘<samp class="samp">linear (default)</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="Examples-135"></a>
- <h4 class="subsection">39.141.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-135" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-135" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply lens correction with make "Canon", camera model "Canon EOS 100D", and lens
- model "Canon EF-S 18-55mm f/3.5-5.6 IS STM" with focal length of "18" and
- aperture of "8.0".
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS STM":focal_length=18:aperture=8 -c:v h264 -b:v 8000k output.mov
- </pre></div>
- </li><li>Apply the same as before, but only for the first 5 seconds of video.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS STM":focal_length=18:aperture=8:enable='lte(t\,5)' -c:v h264 -b:v 8000k output.mov
- </pre></div>
- </li></ul>
- <a name="lcevc"></a>
- <h3 class="section">39.142 lcevc<span class="pull-right"><a class="anchor hidden-xs" href="#lcevc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lcevc" aria-hidden="true">TOC</a></span></h3>
- <p>Low Complexity Enhancement Video Codec filter based on liblcevc_dec
- (<a class="url" href="https://github.com/v-novaltd/LCEVCdec">https://github.com/v-novaltd/LCEVCdec</a>).
- </p>
- <a name="libplacebo"></a>
- <h3 class="section">39.143 libplacebo<span class="pull-right"><a class="anchor hidden-xs" href="#libplacebo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libplacebo" aria-hidden="true">TOC</a></span></h3>
- <p>Flexible GPU-accelerated processing filter based on libplacebo
- (<a class="url" href="https://code.videolan.org/videolan/libplacebo">https://code.videolan.org/videolan/libplacebo</a>).
- </p>
- <a name="Options-121"></a>
- <h4 class="subsection">39.143.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-121" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-121" aria-hidden="true">TOC</a></span></h4>
- <p>The options for this filter are divided into the following sections:
- </p>
- <a name="Output-mode"></a>
- <h4 class="subsubsection">39.143.1.1 Output mode<span class="pull-right"><a class="anchor hidden-xs" href="#Output-mode" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Output-mode" aria-hidden="true">TOC</a></span></h4>
- <p>These options control the overall output mode. By default, libplacebo will try
- to preserve the source colorimetry and size as best as it can, but it will
- apply any embedded film grain, dolby vision metadata or anamorphic SAR present
- in source frames.
- </p><dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set the number of inputs. This can be used, alongside the <code class="code">idx</code> variable,
- to allow placing/blending multiple inputs inside the output frame. This
- effectively enables functionality similar to <a class="ref" href="#hstack">hstack</a>, <a class="ref" href="#overlay">overlay</a>, etc.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the output video dimension expression. Default values are <code class="code">iw</code> and
- <code class="code">ih</code>.
- </p>
- <p>Allows for the same expressions as the <a class="ref" href="#scale">scale</a> filter.
- </p>
- </dd>
- <dt><samp class="option">crop_x</samp></dt>
- <dt><samp class="option">crop_y</samp></dt>
- <dd><p>Set the input crop x/y expressions, default values are <code class="code">(iw-cw)/2</code> and
- <code class="code">(ih-ch)/2</code>.
- </p>
- </dd>
- <dt><samp class="option">crop_w</samp></dt>
- <dt><samp class="option">crop_h</samp></dt>
- <dd><p>Set the input crop width/height expressions, default values are <code class="code">iw</code> and
- <code class="code">ih</code>.
- </p>
- </dd>
- <dt><samp class="option">pos_x</samp></dt>
- <dt><samp class="option">pos_y</samp></dt>
- <dd><p>Set the output placement x/y expressions, default values are <code class="code">(ow-pw)/2</code>
- and <code class="code">(oh-ph)/2</code>.
- </p>
- </dd>
- <dt><samp class="option">pos_w</samp></dt>
- <dt><samp class="option">pos_h</samp></dt>
- <dd><p>Set the output placement width/height expressions, default values are <code class="code">ow</code>
- and <code class="code">oh</code>.
- </p>
- </dd>
- <dt><samp class="option">rotate</samp></dt>
- <dd><p>Rotate the input frame clockwise by the specified angle.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">0, 360</samp>’</dt>
- <dt>‘<samp class="samp">90</samp>’</dt>
- <dt>‘<samp class="samp">180</samp>’</dt>
- <dt>‘<samp class="samp">270</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">fps</samp></dt>
- <dd><p>Set the output frame rate. This can be rational, e.g. <code class="code">60000/1001</code>. If
- set to the special string <code class="code">none</code> (the default), input timestamps will
- instead be passed through to the output unmodified. Otherwise, the input video
- frames will be interpolated as necessary to rescale the video to the specified
- target framerate, in a manner as determined by the <samp class="option">frame_mixer</samp> option.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Set the output format override. If unset (the default), frames will be output
- in the same format as the respective input frames. Otherwise, format conversion
- will be performed.
- </p>
- </dd>
- <dt><samp class="option">force_original_aspect_ratio</samp></dt>
- <dt><samp class="option">force_divisible_by</samp></dt>
- <dd><p>Work the same as the identical <a class="ref" href="#scale">scale</a> filter options. Note that
- <samp class="option">force_divisible_by</samp> also works with <code class="code">fit_sense=constraint</code>.
- </p>
- </dd>
- <dt><samp class="option">reset_sar</samp></dt>
- <dd><p>If enabled, output frames will always have a pixel aspect ratio of 1:1. If
- disabled (the default), any aspect ratio mismatches, including those from
- e.g. anamorphic video sources, are forwarded to the output pixel aspect ratio.
- </p>
- </dd>
- <dt><samp class="option">normalize_sar</samp></dt>
- <dd><p>Like <samp class="option">reset_sar</samp>, but instead of stretching the video content to fill
- the new output aspect ratio, the content is instead padded or cropped as
- necessary. Mutually exclusive with <samp class="option">fit_mode</samp>. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">pad_crop_ratio</samp></dt>
- <dd><p>Specifies a ratio (between <code class="code">0.0</code> and <code class="code">1.0</code>) between padding and
- cropping when the input aspect ratio does not match the output aspect ratio and
- <samp class="option">normalize_sar</samp> is in effect. The default of <code class="code">0.0</code> always pads the
- content with black borders, while a value of <code class="code">1.0</code> always crops off parts
- of the content. Intermediate values are possible, leading to a mix of the two
- approaches.
- </p>
- </dd>
- <dt><samp class="option">fit_mode</samp></dt>
- <dd><p>Specify the content fit strategy according to a list of predefined modes.
- Determines how the input image is to be placed inside the destination crop
- rectangle (as defined by <code class="code">pos_x/y</code> and <code class="code">pos_w/h</code>). The names and
- their implementations are taken from the CSS ’object-fit’ property. Note that
- this option is mutually exclusive with <samp class="option">normalize_sar</samp>. Defaults to
- <code class="code">fill</code>. Valid values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">fill</samp>’</dt>
- <dd><p>Stretch the input to the output rectangle, ignoring aspect ratio mismatches.
- Note that unless <samp class="option">reset_sar</samp> is also enabled, the output will still
- have the correct pixel aspect ratio tagged.
- </p>
- </dd>
- <dt>‘<samp class="samp">contain</samp>’</dt>
- <dd><p>Scale the input to fit inside the output, preserving aspect ratio by padding.
- Equivalent to <samp class="option">normalize_sar</samp> with <samp class="option">pad_crop_ratio</samp> set to
- <code class="code">0.0</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">cover</samp>’</dt>
- <dd><p>Scale the input to fill the output, preserving aspect ratio by cropping.
- Equivalent to <samp class="option">normalize_sar</samp> with <samp class="option">pad_crop_ratio</samp> set to
- <code class="code">1.0</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">none, place</samp>’</dt>
- <dd><p>Don’t scale the input. The input will be placed inside the output rectangle at
- its natural size; which may result in additional padding or cropping.
- </p>
- </dd>
- <dt>‘<samp class="samp">scale_down</samp>’</dt>
- <dd><p>Scale the input down as much as needed to fit inside the output. Equivalent
- to either <code class="code">contain</code> or <code class="code">none</code>, depending on whether the input is
- larger than the output or not.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">fit_sense</samp></dt>
- <dd><p>When <samp class="option">fit_mode</samp> is in use, this option controls how the fit strategy
- is applied against the specified output resolution. Mutually exclusive with
- <samp class="option">force_original_aspect_ratio</samp>. Valid values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">target</samp>’</dt>
- <dd><p>The computed output resolution is taken as the exact size of the output frame.
- This is the default behavior.
- </p>
- </dd>
- <dt>‘<samp class="samp">constraint</samp>’</dt>
- <dd><p>The computed output resolution is a size reference against which the fit mode
- is applied, enlarging or decreasing the true frame size as needed to fit the
- content.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">fillcolor</samp></dt>
- <dd><p>Set the color used to fill the output area not covered by the output image, for
- example as a result of <samp class="option">normalize_sar</samp>. For the general syntax of this
- option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>. Defaults to <code class="code">black@0</code>.
- </p>
- </dd>
- <dt><samp class="option">corner_rounding</samp></dt>
- <dd><p>Render frames with rounded corners. The value, given as a float ranging from
- <code class="code">0.0</code> to <code class="code">1.0</code>, indicates the relative degree of rounding, from fully
- square to fully circular. In other words, it gives the radius divided by half
- the smaller side length. Defaults to <code class="code">0.0</code>.
- </p>
- </dd>
- <dt><samp class="option">lut</samp></dt>
- <dd><p>Specifies a custom LUT (in Adobe .cube format) to apply to the colors
- as part of color conversion. The exact interpretation depends on the value
- of <samp class="option">lut_type</samp>.
- </p>
- </dd>
- <dt><samp class="option">lut_type</samp></dt>
- <dd><p>Controls the interpretation of color values fed to and from the LUT
- specified as <samp class="option">lut</samp>. Valid values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Chooses the interpretation of the LUT automatically from tagged
- metadata, and otherwise falls back to ‘<samp class="samp">native</samp>’. (Default)
- </p>
- </dd>
- <dt>‘<samp class="samp">native</samp>’</dt>
- <dd><p>Applied to raw image contents in its native RGB colorspace (non-linear
- light), before conversion to the output color space.
- </p>
- </dd>
- <dt>‘<samp class="samp">normalized</samp>’</dt>
- <dd><p>Applied to the normalized RGB image contents, in linear light, before
- conversion to the output color space.
- </p>
- </dd>
- <dt>‘<samp class="samp">conversion</samp>’</dt>
- <dd><p>Fully replaces the conversion from the image color space to the output
- color space. If such a LUT is present, it has the highest priority, and
- overrides any ICC profiles, as well as options related to tone mapping
- and output colorimetry (<samp class="option">color_primaries</samp>, <samp class="option">color_trc</samp>).
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">extra_opts</samp></dt>
- <dd><p>Pass extra libplacebo internal configuration options. These can be specified
- as a list of <var class="var">key</var>=<var class="var">value</var> pairs separated by ’:’. The following example
- shows how to configure a custom filter kernel ("EWA LanczosSharp") and use it
- to double the input image resolution:
- </p>
- <div class="example">
- <pre class="example-preformatted">-vf "libplacebo=w=iw*2:h=ih*2:extra_opts='upscaler=custom\:upscaler_preset=ewa_lanczos\:upscaler_blur=0.9812505644269356'"
- </pre></div>
- </dd>
- <dt><samp class="option">shader_cache</samp></dt>
- <dd><p>File path of a cache directory that libplacebo will use to store and load
- cached shader objects. This cache is not cleaned up automatically. If the
- path does not end in a directory separator, the generated filenames will be
- effectively prefixed by the last path component. All directories must already
- exist.
- </p>
- <div class="example">
- <pre class="example-preformatted">-vf "libplacebo=shader_cache=/tmp/pl-shader-"
- </pre></div>
- </dd>
- <dt><samp class="option">colorspace</samp></dt>
- <dt><samp class="option">color_primaries</samp></dt>
- <dt><samp class="option">color_trc</samp></dt>
- <dt><samp class="option">range</samp></dt>
- <dt><samp class="option">chroma_location</samp></dt>
- <dd><p>Configure the colorspace that output frames will be delivered in. The default
- value of <code class="code">auto</code> outputs frames in the same format as the input frames,
- leading to no change. For any other value, conversion will be performed.
- </p>
- <p>See the <a class="ref" href="#setparams">setparams</a> filter for a list of possible values.
- </p>
- </dd>
- <dt><samp class="option">alpha_mode</samp></dt>
- <dd><p>Choose the desired output alpha mode, when the output format has an alpha
- channel. See the <a class="ref" href="#setparams">setparams</a> filter for a list of possible values.
- </p>
- </dd>
- <dt><samp class="option">apply_filmgrain</samp></dt>
- <dd><p>Apply film grain (e.g. AV1 or H.274) if present in source frames, and strip
- it from the output. Enabled by default.
- </p>
- </dd>
- <dt><samp class="option">apply_dolbyvision</samp></dt>
- <dd><p>Apply Dolby Vision RPU metadata if present in source frames, and strip it from
- the output. Enabled by default. Note that Dolby Vision will always output
- BT.2020+PQ, overriding the usual input frame metadata. These will also be
- picked as the values of <code class="code">auto</code> for the respective frame output options.
- </p></dd>
- </dl>
- <p>In addition to the expression constants documented for the <a class="ref" href="#scale">scale</a> filter,
- the <samp class="option">crop_w</samp>, <samp class="option">crop_h</samp>, <samp class="option">crop_x</samp>, <samp class="option">crop_y</samp>,
- <samp class="option">pos_w</samp>, <samp class="option">pos_h</samp>, <samp class="option">pos_x</samp> and <samp class="option">pos_y</samp> options can
- also contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">in_idx, idx</samp></dt>
- <dd><p>The (0-based) numeric index of the currently active input stream.
- </p></dd>
- <dt><samp class="option">crop_w, cw</samp></dt>
- <dt><samp class="option">crop_h, ch</samp></dt>
- <dd><p>The computed values of <samp class="option">crop_w</samp> and <samp class="option">crop_h</samp>.
- </p>
- </dd>
- <dt><samp class="option">pos_w, pw</samp></dt>
- <dt><samp class="option">pos_h, ph</samp></dt>
- <dd><p>The computed values of <samp class="option">pos_w</samp> and <samp class="option">pos_h</samp>.
- </p>
- </dd>
- <dt><samp class="option">in_t, t</samp></dt>
- <dd><p>The input frame timestamp, in seconds. NAN if input timestamp is unknown.
- </p>
- </dd>
- <dt><samp class="option">out_t, ot</samp></dt>
- <dd><p>The input frame timestamp, in seconds. NAN if input timestamp is unknown.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>The input frame number, starting with 0.
- </p></dd>
- </dl>
- <a name="Scaling"></a>
- <h4 class="subsubsection">39.143.1.2 Scaling<span class="pull-right"><a class="anchor hidden-xs" href="#Scaling" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Scaling" aria-hidden="true">TOC</a></span></h4>
- <p>The options in this section control how libplacebo performs upscaling and (if
- necessary) downscaling. Note that libplacebo will always internally operate on
- 4:4:4 content, so any sub-sampled chroma formats such as <code class="code">yuv420p</code> will
- necessarily be upsampled and downsampled as part of the rendering process. That
- means scaling might be in effect even if the source and destination resolution
- are the same.
- </p><dl class="table">
- <dt><samp class="option">upscaler</samp></dt>
- <dt><samp class="option">downscaler</samp></dt>
- <dd><p>Configure the filter kernel used for upscaling and downscaling. The respective
- defaults are <code class="code">spline36</code> and <code class="code">mitchell</code>. For a full list of possible
- values, pass <code class="code">help</code> to these options. The most important values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Forces the use of built-in GPU texture sampling (typically bilinear). Extremely
- fast but poor quality, especially when downscaling.
- </p>
- </dd>
- <dt>‘<samp class="samp">bilinear</samp>’</dt>
- <dd><p>Bilinear interpolation. Can generally be done for free on GPUs, except when
- doing so would lead to aliasing. Fast and low quality.
- </p>
- </dd>
- <dt>‘<samp class="samp">nearest</samp>’</dt>
- <dd><p>Nearest-neighbour interpolation. Sharp but highly aliasing.
- </p>
- </dd>
- <dt>‘<samp class="samp">oversample</samp>’</dt>
- <dd><p>Algorithm that looks visually similar to nearest-neighbour interpolation but
- tries to preserve pixel aspect ratio. Good for pixel art, since it results in
- minimal distortion of the artistic appearance.
- </p>
- </dd>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dd><p>Standard sinc-sinc interpolation kernel.
- </p>
- </dd>
- <dt>‘<samp class="samp">spline36</samp>’</dt>
- <dd><p>Cubic spline approximation of lanczos. No difference in performance, but has
- very slightly less ringing.
- </p>
- </dd>
- <dt>‘<samp class="samp">ewa_lanczos</samp>’</dt>
- <dd><p>Elliptically weighted average version of lanczos, based on a jinc-jinc kernel.
- This is also popularly referred to as just "Jinc scaling". Slow but very high
- quality.
- </p>
- </dd>
- <dt>‘<samp class="samp">gaussian</samp>’</dt>
- <dd><p>Gaussian kernel. Has certain ideal mathematical properties, but subjectively
- very blurry.
- </p>
- </dd>
- <dt>‘<samp class="samp">mitchell</samp>’</dt>
- <dd><p>Cubic BC spline with parameters recommended by Mitchell and Netravali. Very
- little ringing.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">frame_mixer</samp></dt>
- <dd><p>Controls the kernel used for mixing frames temporally. The default value is
- <code class="code">none</code>, which disables frame mixing. For a full list of possible values,
- pass <code class="code">help</code> to this option. The most important values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disables frame mixing, giving a result equivalent to "nearest neighbour"
- semantics.
- </p>
- </dd>
- <dt>‘<samp class="samp">oversample</samp>’</dt>
- <dd><p>Oversamples the input video to create a "Smooth Motion"-type effect: if an
- output frame would exactly fall on the transition between two video frames, it
- is blended according to the relative overlap. This is the recommended option
- whenever preserving the original subjective appearance is desired.
- </p>
- </dd>
- <dt>‘<samp class="samp">mitchell_clamp</samp>’</dt>
- <dd><p>Larger filter kernel that smoothly interpolates multiple frames in a manner
- designed to eliminate ringing and other artefacts as much as possible. This is
- the recommended option wherever maximum visual smoothness is desired.
- </p>
- </dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Linear blend/fade between frames. Especially useful for constructing e.g.
- slideshows.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">antiringing</samp></dt>
- <dd><p>Enables anti-ringing (for non-EWA filters). The value (between <code class="code">0.0</code> and
- <code class="code">1.0</code>) configures the strength of the anti-ringing algorithm. May increase
- aliasing if set too high. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">sigmoid</samp></dt>
- <dd><p>Enable sigmoidal compression during upscaling. Reduces ringing slightly.
- Enabled by default.
- </p></dd>
- </dl>
- <a name="Deinterlacing"></a>
- <h4 class="subsubsection">39.143.1.3 Deinterlacing<span class="pull-right"><a class="anchor hidden-xs" href="#Deinterlacing" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Deinterlacing" aria-hidden="true">TOC</a></span></h4>
- <p>Deinterlacing is automatically supported when frames are tagged as interlaced,
- however frames are not deinterlaced unless a deinterlacing algorithm is chosen.
- </p><dl class="table">
- <dt><samp class="option">deinterlace</samp></dt>
- <dd><p>The the deinterlacing algorithm to use.
- </p><dl class="table">
- <dt>‘<samp class="samp">weave</samp>’</dt>
- <dd><p>No deinterlacing, weave fields together into a single frame. This is the default.
- </p></dd>
- <dt>‘<samp class="samp">bob</samp>’</dt>
- <dd><p>Naive bob deinterlacing, simply repeat each field line twice.
- </p></dd>
- <dt>‘<samp class="samp">yadif</samp>’</dt>
- <dd><p>Yet another deinterlacing filter. See the <a class="ref" href="#yadif">yadif</a> filter for more details.
- </p></dd>
- <dt>‘<samp class="samp">bwdif</samp>’</dt>
- <dd><p>Bob weaver deinterlacing filter. See the <a class="ref" href="#bwdif">bwdif</a> filter for more details.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">skip_spatial_check</samp></dt>
- <dd><p>Skip the spatial deinterlacing check when using <code class="code">yadif</code> deinterlacing.
- </p>
- </dd>
- <dt><samp class="option">send_fields</samp></dt>
- <dd><p>Output a frame for each field, rather than for each frame. Note that this will
- always double the tagged output frame rate, even if the input does not contain
- any interlaced frames. Disabled by default.
- </p></dd>
- </dl>
- <a name="Debanding"></a>
- <h4 class="subsubsection">39.143.1.4 Debanding<span class="pull-right"><a class="anchor hidden-xs" href="#Debanding" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Debanding" aria-hidden="true">TOC</a></span></h4>
- <p>Libplacebo comes with a built-in debanding filter that is good at counteracting
- many common sources of banding and blocking. Turning this on is highly
- recommended whenever quality is desired.
- </p><dl class="table">
- <dt><samp class="option">deband</samp></dt>
- <dd><p>Enable (fast) debanding algorithm. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">deband_iterations</samp></dt>
- <dd><p>Number of deband iterations of the debanding algorithm. Each iteration is
- performed with progressively increased radius (and diminished threshold).
- Recommended values are in the range <code class="code">1</code> to <code class="code">4</code>. Defaults to <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">deband_threshold</samp></dt>
- <dd><p>Debanding filter strength. Higher numbers lead to more aggressive debanding.
- Defaults to <code class="code">4.0</code>.
- </p>
- </dd>
- <dt><samp class="option">deband_radius</samp></dt>
- <dd><p>Debanding filter radius. A higher radius is better for slow gradients, while
- a lower radius is better for steep gradients. Defaults to <code class="code">16.0</code>.
- </p>
- </dd>
- <dt><samp class="option">deband_grain</samp></dt>
- <dd><p>Amount of extra output grain to add. Helps hide imperfections. Defaults to
- <code class="code">6.0</code>.
- </p></dd>
- </dl>
- <a name="Color-adjustment"></a>
- <h4 class="subsubsection">39.143.1.5 Color adjustment<span class="pull-right"><a class="anchor hidden-xs" href="#Color-adjustment" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Color-adjustment" aria-hidden="true">TOC</a></span></h4>
- <p>A collection of subjective color controls. Not very rigorous, so the exact
- effect will vary somewhat depending on the input primaries and colorspace.
- </p><dl class="table">
- <dt><samp class="option">brightness</samp></dt>
- <dd><p>Brightness boost, between <code class="code">-1.0</code> and <code class="code">1.0</code>. Defaults to <code class="code">0.0</code>.
- </p>
- </dd>
- <dt><samp class="option">contrast</samp></dt>
- <dd><p>Contrast gain, between <code class="code">0.0</code> and <code class="code">16.0</code>. Defaults to <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Saturation gain, between <code class="code">0.0</code> and <code class="code">16.0</code>. Defaults to <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">hue</samp></dt>
- <dd><p>Hue shift in radians, between <code class="code">-3.14</code> and <code class="code">3.14</code>. Defaults to
- <code class="code">0.0</code>. This will rotate the UV subvector, defaulting to BT.709
- coefficients for RGB inputs.
- </p>
- </dd>
- <dt><samp class="option">gamma</samp></dt>
- <dd><p>Gamma adjustment, between <code class="code">0.0</code> and <code class="code">16.0</code>. Defaults to <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">temperature</samp></dt>
- <dd><p>Color temperature adjustment. Lower values make the output warmer/redder,
- down to <code class="code">1667</code>, while higher values make the output cooler/bluer, up to
- <code class="code">25000</code>. Defaults to <code class="code">6500</code> (neutral white).
- </p>
- </dd>
- <dt><samp class="option">cones</samp></dt>
- <dd><p>Cone model to use for color blindness simulation. Accepts any combination of
- <code class="code">l</code>, <code class="code">m</code> and <code class="code">s</code>. Here are some examples:
- </p><dl class="table">
- <dt>‘<samp class="samp">m</samp>’</dt>
- <dd><p>Deuteranomaly / deuteranopia (affecting 3%-4% of the population)
- </p></dd>
- <dt>‘<samp class="samp">l</samp>’</dt>
- <dd><p>Protanomaly / protanopia (affecting 1%-2% of the population)
- </p></dd>
- <dt>‘<samp class="samp">l+m</samp>’</dt>
- <dd><p>Monochromacy (very rare)
- </p></dd>
- <dt>‘<samp class="samp">l+m+s</samp>’</dt>
- <dd><p>Achromatopsy (complete loss of daytime vision, extremely rare)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">cone-strength</samp></dt>
- <dd><p>Gain factor for the cones specified by <code class="code">cones</code>, between <code class="code">0.0</code> and
- <code class="code">10.0</code>. A value of <code class="code">1.0</code> results in no change to color vision. A
- value of <code class="code">0.0</code> (the default) simulates complete loss of those cones. Values
- above <code class="code">1.0</code> result in exaggerating the differences between cones, which
- may help compensate for reduced color vision.
- </p></dd>
- </dl>
- <a name="Peak-detection"></a>
- <h4 class="subsubsection">39.143.1.6 Peak detection<span class="pull-right"><a class="anchor hidden-xs" href="#Peak-detection" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Peak-detection" aria-hidden="true">TOC</a></span></h4>
- <p>To help deal with sources that only have static HDR10 metadata (or no tagging
- whatsoever), libplacebo uses its own internal frame analysis compute shader to
- analyze source frames and adapt the tone mapping function in realtime. If this
- is too slow, or if exactly reproducible frame-perfect results are needed, it’s
- recommended to turn this feature off.
- </p><dl class="table">
- <dt><samp class="option">peak_detect</samp></dt>
- <dd><p>Enable HDR peak detection. Ignores static MaxCLL/MaxFALL values in favor of
- dynamic detection from the input. Note that the detected values do not get
- written back to the output frames, they merely guide the internal tone mapping
- process. Enabled by default.
- </p>
- </dd>
- <dt><samp class="option">smoothing_period</samp></dt>
- <dd><p>Peak detection smoothing period, between <code class="code">0.0</code> and <code class="code">1000.0</code>. Higher
- values result in peak detection becoming less responsive to changes in the
- input. Defaults to <code class="code">100.0</code>.
- </p>
- </dd>
- <dt><samp class="option">scene_threshold_low</samp></dt>
- <dt><samp class="option">scene_threshold_high</samp></dt>
- <dd><p>Lower and upper thresholds for scene change detection. Expressed in a
- logarithmic scale between <code class="code">0.0</code> and <code class="code">100.0</code>. Default to <code class="code">5.5</code>
- and <code class="code">10.0</code>, respectively. Setting either to a negative value disables
- this functionality.
- </p>
- </dd>
- <dt><samp class="option">percentile</samp></dt>
- <dd><p>Which percentile of the frame brightness histogram to use as the source peak
- for tone-mapping. Defaults to <code class="code">99.995</code>, a fairly conservative value.
- Setting this to <code class="code">100.0</code> disables frame histogram measurement and instead
- uses the true peak brightness for tone-mapping.
- </p></dd>
- </dl>
- <a name="Tone-mapping"></a>
- <h4 class="subsubsection">39.143.1.7 Tone mapping<span class="pull-right"><a class="anchor hidden-xs" href="#Tone-mapping" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Tone-mapping" aria-hidden="true">TOC</a></span></h4>
- <p>The options in this section control how libplacebo performs tone-mapping and
- gamut-mapping when dealing with mismatches between wide-gamut or HDR content.
- In general, libplacebo relies on accurate source tagging and mastering display
- gamut information to produce the best results.
- </p><dl class="table">
- <dt><samp class="option">gamut_mode</samp></dt>
- <dd><p>How to handle out-of-gamut colors that can occur as a result of colorimetric
- gamut mapping.
- </p><dl class="table">
- <dt>‘<samp class="samp">clip</samp>’</dt>
- <dd><p>Do nothing, simply clip out-of-range colors to the RGB volume. Low quality but
- extremely fast.
- </p></dd>
- <dt>‘<samp class="samp">perceptual</samp>’</dt>
- <dd><p>Perceptually soft-clip colors to the gamut volume. This is the default.
- </p></dd>
- <dt>‘<samp class="samp">relative</samp>’</dt>
- <dd><p>Relative colorimetric hard-clip. Similar to <code class="code">perceptual</code> but without
- the soft knee.
- </p></dd>
- <dt>‘<samp class="samp">saturation</samp>’</dt>
- <dd><p>Saturation mapping, maps primaries directly to primaries in RGB space.
- Not recommended except for artificial computer graphics for which a bright,
- saturated display is desired.
- </p></dd>
- <dt>‘<samp class="samp">absolute</samp>’</dt>
- <dd><p>Absolute colorimetric hard-clip. Performs no adjustment of the white point.
- </p></dd>
- <dt>‘<samp class="samp">desaturate</samp>’</dt>
- <dd><p>Hard-desaturates out-of-gamut colors towards white, while preserving the
- luminance. Has a tendency to distort the visual appearance of bright objects.
- </p></dd>
- <dt>‘<samp class="samp">darken</samp>’</dt>
- <dd><p>Linearly reduces content brightness to preserves saturated details, followed by
- clipping the remaining out-of-gamut colors.
- </p></dd>
- <dt>‘<samp class="samp">warn</samp>’</dt>
- <dd><p>Highlight out-of-gamut pixels (by inverting/marking them).
- </p></dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Linearly reduces chromaticity of the entire image to make it fit within the
- target color volume. Be careful when using this on BT.2020 sources without
- proper mastering metadata, as doing so will lead to excessive desaturation.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tonemapping</samp></dt>
- <dd><p>Tone-mapping algorithm to use. Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Automatic selection based on internal heuristics. This is the default.
- </p></dd>
- <dt>‘<samp class="samp">clip</samp>’</dt>
- <dd><p>Performs no tone-mapping, just clips out-of-range colors. Retains perfect color
- accuracy for in-range colors but completely destroys out-of-range information.
- Does not perform any black point adaptation. Not configurable.
- </p></dd>
- <dt>‘<samp class="samp">st2094-40</samp>’</dt>
- <dd><p>EETF from SMPTE ST 2094-40 Annex B, which applies the Bezier curves from HDR10+
- dynamic metadata based on Bezier curves to perform tone-mapping. The OOTF used
- is adjusted based on the ratio between the targeted and actual display peak
- luminances.
- </p></dd>
- <dt>‘<samp class="samp">st2094-10</samp>’</dt>
- <dd><p>EETF from SMPTE ST 2094-10 Annex B.2, which takes into account the input signal
- average luminance in addition to the maximum/minimum. The configurable contrast
- parameter influences the slope of the linear output segment, defaulting to
- <code class="code">1.0</code> for no increase/decrease in contrast. Note that this does not
- currently include the subjective gain/offset/gamma controls defined in Annex
- B.3.
- </p></dd>
- <dt>‘<samp class="samp">bt.2390</samp>’</dt>
- <dd><p>EETF from the ITU-R Report BT.2390, a hermite spline roll-off with linear
- segment. The knee point offset is configurable. Note that this parameter
- defaults to <code class="code">1.0</code>, rather than the value of <code class="code">0.5</code> from the ITU-R
- spec.
- </p></dd>
- <dt>‘<samp class="samp">bt.2446a</samp>’</dt>
- <dd><p>EETF from ITU-R Report BT.2446, method A. Designed for well-mastered HDR
- sources. Can be used for both forward and inverse tone mapping. Not
- configurable.
- </p></dd>
- <dt>‘<samp class="samp">spline</samp>’</dt>
- <dd><p>Simple spline consisting of two polynomials, joined by a single pivot point.
- The parameter gives the pivot point (in PQ space), defaulting to <code class="code">0.30</code>.
- Can be used for both forward and inverse tone mapping.
- </p></dd>
- <dt>‘<samp class="samp">reinhard</samp>’</dt>
- <dd><p>Simple non-linear, global tone mapping algorithm. The parameter specifies the
- local contrast coefficient at the display peak. Essentially, a parameter of
- <code class="code">0.5</code> implies that the reference white will be about half as bright as
- when clipping. Defaults to <code class="code">0.5</code>, which results in the simplest
- formulation of this function.
- </p></dd>
- <dt>‘<samp class="samp">mobius</samp>’</dt>
- <dd><p>Generalization of the reinhard tone mapping algorithm to support an additional
- linear slope near black. The tone mapping parameter indicates the trade-off
- between the linear section and the non-linear section. Essentially, for a given
- parameter <var class="var">x</var>, every color value below <var class="var">x</var> will be mapped linearly,
- while higher values get non-linearly tone-mapped. Values near <code class="code">1.0</code> make
- this curve behave like <code class="code">clip</code>, while values near <code class="code">0.0</code> make this
- curve behave like <code class="code">reinhard</code>. The default value is <code class="code">0.3</code>, which
- provides a good balance between colorimetric accuracy and preserving
- out-of-gamut details.
- </p></dd>
- <dt>‘<samp class="samp">hable</samp>’</dt>
- <dd><p>Piece-wise, filmic tone-mapping algorithm developed by John Hable for use in
- Uncharted 2, inspired by a similar tone-mapping algorithm used by Kodak.
- Popularized by its use in video games with HDR rendering. Preserves both dark
- and bright details very well, but comes with the drawback of changing the
- average brightness quite significantly. This is sort of similar to
- <code class="code">reinhard</code> with parameter <code class="code">0.24</code>.
- </p></dd>
- <dt>‘<samp class="samp">gamma</samp>’</dt>
- <dd><p>Fits a gamma (power) function to transfer between the source and target color
- spaces, effectively resulting in a perceptual hard-knee joining two roughly
- linear sections. This preserves details at all scales fairly accurately, but
- can result in an image with a muted or dull appearance. The parameter is used
- as the cutoff point, defaulting to <code class="code">0.5</code>.
- </p></dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Linearly stretches the input range to the output range, in PQ space. This will
- preserve all details accurately, but results in a significantly different
- average brightness. Can be used for inverse tone-mapping in addition to regular
- tone-mapping. The parameter can be used as an additional linear gain
- coefficient (defaulting to <code class="code">1.0</code>).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tonemapping_param</samp></dt>
- <dd><p>For tunable tone mapping functions, this parameter can be used to fine-tune the
- curve behavior. Refer to the documentation of <code class="code">tonemapping</code>. The default
- value of <code class="code">0.0</code> is replaced by the curve’s preferred default setting.
- </p>
- </dd>
- <dt><samp class="option">inverse_tonemapping</samp></dt>
- <dd><p>If enabled, this filter will also attempt stretching SDR signals to fill HDR
- output color volumes. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">tonemapping_lut_size</samp></dt>
- <dd><p>Size of the tone-mapping LUT, between <code class="code">2</code> and <code class="code">1024</code>. Defaults to
- <code class="code">256</code>. Note that this figure is squared when combined with
- <code class="code">peak_detect</code>.
- </p>
- </dd>
- <dt><samp class="option">contrast_recovery</samp></dt>
- <dd><p>Contrast recovery strength. If set to a value above <code class="code">0.0</code>, the source
- image will be divided into high-frequency and low-frequency components, and a
- portion of the high-frequency image is added back onto the tone-mapped output.
- May cause excessive ringing artifacts for some HDR sources, but can improve the
- subjective sharpness and detail left over in the image after tone-mapping.
- Defaults to <code class="code">0.30</code>.
- </p>
- </dd>
- <dt><samp class="option">contrast_smoothness</samp></dt>
- <dd><p>Contrast recovery lowpass kernel size. Defaults to <code class="code">3.5</code>. Increasing or
- decreasing this will affect the visual appearance substantially. Has no effect
- when <code class="code">contrast_recovery</code> is disabled.
- </p></dd>
- </dl>
- <a name="Dithering"></a>
- <h4 class="subsubsection">39.143.1.8 Dithering<span class="pull-right"><a class="anchor hidden-xs" href="#Dithering" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Dithering" aria-hidden="true">TOC</a></span></h4>
- <p>By default, libplacebo will dither whenever necessary, which includes rendering
- to any integer format below 16-bit precision. It’s recommended to always leave
- this on, since not doing so may result in visible banding in the output, even
- if the <code class="code">debanding</code> filter is enabled. If maximum performance is needed,
- use <code class="code">ordered_fixed</code> instead of disabling dithering.
- </p><dl class="table">
- <dt><samp class="option">dithering</samp></dt>
- <dd><p>Dithering method to use. Accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disables dithering completely. May result in visible banding.
- </p></dd>
- <dt>‘<samp class="samp">blue</samp>’</dt>
- <dd><p>Dither with pseudo-blue noise. This is the default.
- </p></dd>
- <dt>‘<samp class="samp">ordered</samp>’</dt>
- <dd><p>Tunable ordered dither pattern.
- </p></dd>
- <dt>‘<samp class="samp">ordered_fixed</samp>’</dt>
- <dd><p>Faster ordered dither with a fixed size of <code class="code">6</code>. Texture-less.
- </p></dd>
- <dt>‘<samp class="samp">white</samp>’</dt>
- <dd><p>Dither with white noise. Texture-less.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dither_lut_size</samp></dt>
- <dd><p>Dither LUT size, as log base2 between <code class="code">1</code> and <code class="code">8</code>. Defaults to
- <code class="code">6</code>, corresponding to a LUT size of <code class="code">64x64</code>.
- </p>
- </dd>
- <dt><samp class="option">dither_temporal</samp></dt>
- <dd><p>Enables temporal dithering. Disabled by default.
- </p></dd>
- </dl>
- <a name="Custom-shaders"></a>
- <h4 class="subsubsection">39.143.1.9 Custom shaders<span class="pull-right"><a class="anchor hidden-xs" href="#Custom-shaders" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Custom-shaders" aria-hidden="true">TOC</a></span></h4>
- <p>libplacebo supports a number of custom shaders based on the mpv .hook GLSL
- syntax. A collection of such shaders can be found here:
- <a class="url" href="https://github.com/mpv-player/mpv/wiki/User-Scripts#user-shaders">https://github.com/mpv-player/mpv/wiki/User-Scripts#user-shaders</a>
- </p>
- <p>A full description of the mpv shader format is beyond the scope of this
- section, but a summary can be found here:
- <a class="url" href="https://mpv.io/manual/master/#options-glsl-shader">https://mpv.io/manual/master/#options-glsl-shader</a>
- </p><dl class="table">
- <dt><samp class="option">custom_shader_path</samp></dt>
- <dd><p>Specifies a path to a custom shader file to load at runtime.
- </p>
- </dd>
- <dt><samp class="option">custom_shader_bin</samp></dt>
- <dd><p>Specifies a complete custom shader as a raw string.
- </p></dd>
- </dl>
- <a name="Debugging-_002f-performance"></a>
- <h4 class="subsubsection">39.143.1.10 Debugging / performance<span class="pull-right"><a class="anchor hidden-xs" href="#Debugging-_002f-performance" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Debugging-_002f-performance" aria-hidden="true">TOC</a></span></h4>
- <p>All of the options in this section default off. They may be of assistance when
- attempting to squeeze the maximum performance at the cost of quality.
- </p><dl class="table">
- <dt><samp class="option">skip_aa</samp></dt>
- <dd><p>Disable anti-aliasing when downscaling.
- </p>
- </dd>
- <dt><samp class="option">disable_linear</samp></dt>
- <dd><p>Disable linear light scaling.
- </p>
- </dd>
- <dt><samp class="option">disable_builtin</samp></dt>
- <dd><p>Disable built-in GPU sampling (forces LUT).
- </p>
- </dd>
- <dt><samp class="option">disable_fbos</samp></dt>
- <dd><p>Forcibly disable FBOs, resulting in loss of almost all functionality, but
- offering the maximum possible speed.
- </p></dd>
- </dl>
- <a name="Commands-105"></a>
- <h4 class="subsection">39.143.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-105" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-105" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports almost all of the above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-136"></a>
- <h4 class="subsection">39.143.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-136" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-136" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Tone-map input to standard gamut BT.709 output:
- <div class="example">
- <pre class="example-preformatted">libplacebo=colorspace=bt709:color_primaries=bt709:color_trc=bt709:range=tv
- </pre></div>
- </li><li>Rescale input to fit into standard 1080p, with high quality scaling:
- <div class="example">
- <pre class="example-preformatted">libplacebo=w=1920:h=1080:force_original_aspect_ratio=decrease:normalize_sar=true:upscaler=ewa_lanczos:downscaler=ewa_lanczos
- </pre></div>
- </li><li>Interpolate low FPS / VFR input to smoothed constant 60 fps output:
- <div class="example">
- <pre class="example-preformatted">libplacebo=fps=60:frame_mixer=mitchell_clamp
- </pre></div>
- </li><li>Convert input to standard sRGB JPEG:
- <div class="example">
- <pre class="example-preformatted">libplacebo=format=yuv420p:colorspace=bt470bg:color_primaries=bt709:color_trc=iec61966-2-1:range=pc
- </pre></div>
- </li><li>Use higher quality debanding settings:
- <div class="example">
- <pre class="example-preformatted">libplacebo=deband=true:deband_iterations=3:deband_radius=8:deband_threshold=6
- </pre></div>
- </li><li>Run this filter on the CPU, on systems with Mesa installed (and with the most
- expensive options disabled):
- <div class="example">
- <pre class="example-preformatted">ffmpeg ... -init_hw_device vulkan:llvmpipe ... -vf libplacebo=upscaler=none:downscaler=none:peak_detect=false
- </pre></div>
- </li><li>Suppress CPU-based AV1/H.274 film grain application in the decoder, in favor of
- doing it with this filter. Note that this is only a gain if the frames are
- either already on the GPU, or if you’re using libplacebo for other purposes,
- since otherwise the VRAM roundtrip will more than offset any expected speedup.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -export_side_data +film_grain ... -vf libplacebo=apply_filmgrain=true
- </pre></div>
- </li><li>Interop with VAAPI hwdec to avoid round-tripping through RAM:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -init_hw_device vulkan -hwaccel vaapi -hwaccel_output_format vaapi ... -vf libplacebo
- </pre></div>
- </li></ul>
- <a class="anchor" id="libvmaf"></a><a name="libvmaf-1"></a>
- <h3 class="section">39.144 libvmaf<span class="pull-right"><a class="anchor hidden-xs" href="#libvmaf-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvmaf-1" aria-hidden="true">TOC</a></span></h3>
- <p>Calculate the VMAF (Video Multi-Method Assessment Fusion) score for a
- reference/distorted pair of input videos.
- </p>
- <p>The first input is the distorted video, and the second input is the reference video.
- </p>
- <p>The obtained VMAF score is printed through the logging system.
- </p>
- <p>It requires Netflix’s vmaf library (libvmaf) as a pre-requisite.
- After installing the library it can be enabled using:
- <code class="code">./configure --enable-libvmaf</code>.
- </p>
- <p>The filter has following options:
- </p>
- <dl class="table">
- <dt><samp class="option">model</samp></dt>
- <dd><p>A ‘|‘ delimited list of vmaf models. Each model can be configured with a number of parameters.
- Default value: <code class="code">"version=vmaf_v0.6.1"</code>
- </p>
- </dd>
- <dt><samp class="option">feature</samp></dt>
- <dd><p>A ‘|‘ delimited list of features. Each feature can be configured with a number of parameters.
- </p>
- </dd>
- <dt><samp class="option">log_path</samp></dt>
- <dd><p>Set the file path to be used to store log files.
- </p>
- </dd>
- <dt><samp class="option">log_fmt</samp></dt>
- <dd><p>Set the format of the log file (xml, json, csv, or sub).
- </p>
- </dd>
- <dt><samp class="option">pool</samp></dt>
- <dd><p>Set the pool method to be used for computing vmaf.
- Options are <code class="code">min</code>, <code class="code">harmonic_mean</code> or <code class="code">mean</code> (default).
- </p>
- </dd>
- <dt><samp class="option">n_threads</samp></dt>
- <dd><p>Set number of threads to be used when initializing libvmaf.
- Default value: <code class="code">0</code>, no threads.
- </p>
- </dd>
- <dt><samp class="option">n_subsample</samp></dt>
- <dd><p>Set frame subsampling interval to be used.
- </p></dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="Examples-137"></a>
- <h4 class="subsection">39.144.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-137" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-137" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>In the examples below, a distorted video <samp class="file">distorted.mpg</samp> is
- compared with a reference file <samp class="file">reference.mpg</samp>.
- </li><li>Basic usage:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf=log_path=output.xml -f null -
- </pre></div>
- </li><li>Example with multiple models:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf='model=version=vmaf_v0.6.1\\:name=vmaf|version=vmaf_v0.6.1neg\\:name=vmaf_neg' -f null -
- </pre></div>
- </li><li>Example with multiple additional features:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf='feature=name=psnr|name=ciede' -f null -
- </pre></div>
- </li><li>Example with options and different containers:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i distorted.mpg -i reference.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]libvmaf=log_fmt=json:log_path=output.json" -f null -
- </pre></div>
- </li></ul>
- <a name="libvmaf_005fcuda"></a>
- <h3 class="section">39.145 libvmaf_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#libvmaf_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvmaf_005fcuda" aria-hidden="true">TOC</a></span></h3>
- <p>This is the CUDA variant of the <a class="ref" href="#libvmaf">libvmaf</a> filter. It only accepts CUDA frames.
- </p>
- <p>It requires Netflix’s vmaf library (libvmaf) as a pre-requisite.
- After installing the library it can be enabled using:
- <code class="code">./configure --enable-nonfree --enable-ffnvcodec --enable-libvmaf</code>.
- </p>
- <a name="Examples-138"></a>
- <h4 class="subsection">39.145.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-138" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-138" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Basic usage showing CUVID hardware decoding and CUDA scaling with <a class="ref" href="#scale_005fcuda">scale_cuda</a>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg \
- -hwaccel cuda -hwaccel_output_format cuda -codec:v av1_cuvid -i dis.obu \
- -hwaccel cuda -hwaccel_output_format cuda -codec:v av1_cuvid -i ref.obu \
- -filter_complex "
- [0:v]scale_cuda=format=yuv420p[dis]; \
- [1:v]scale_cuda=format=yuv420p[ref]; \
- [dis][ref]libvmaf_cuda=log_fmt=json:log_path=output.json
- " \
- -f null -
- </pre></div>
- </li></ul>
- <a name="limitdiff"></a>
- <h3 class="section">39.146 limitdiff<span class="pull-right"><a class="anchor hidden-xs" href="#limitdiff" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-limitdiff" aria-hidden="true">TOC</a></span></h3>
- <p>Apply limited difference filter using second and optionally third video stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set the threshold to use when allowing certain differences between video streams.
- Any absolute difference value lower or exact than this threshold will pick pixel components from
- first video stream.
- </p>
- </dd>
- <dt><samp class="option">elasticity</samp></dt>
- <dd><p>Set the elasticity of soft thresholding when processing video streams.
- This value multiplied with first one sets second threshold.
- Any absolute difference value greater or exact than second threshold will pick pixel components
- from second video stream. For values between those two threshold
- linear interpolation between first and second video stream will be used.
- </p>
- </dd>
- <dt><samp class="option">reference</samp></dt>
- <dd><p>Enable the reference (third) video stream processing. By default is disabled.
- If set, this video stream will be used for calculating absolute difference with first video
- stream.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Specify which planes will be processed. Defaults to all available.
- </p></dd>
- </dl>
- <a name="Commands-106"></a>
- <h4 class="subsection">39.146.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-106" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-106" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a> except option ‘<samp class="samp">reference</samp>’.
- </p>
- <a name="limiter"></a>
- <h3 class="section">39.147 limiter<span class="pull-right"><a class="anchor hidden-xs" href="#limiter" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-limiter" aria-hidden="true">TOC</a></span></h3>
- <p>Limits the pixel components values to the specified range [min, max].
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">min</samp></dt>
- <dd><p>Lower bound. Defaults to the lowest allowed value for the input.
- </p>
- </dd>
- <dt><samp class="option">max</samp></dt>
- <dd><p>Upper bound. Defaults to the highest allowed value for the input.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Specify which planes will be processed. Defaults to all available.
- </p></dd>
- </dl>
- <a name="Commands-107"></a>
- <h4 class="subsection">39.147.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-107" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-107" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="loop"></a>
- <h3 class="section">39.148 loop<span class="pull-right"><a class="anchor hidden-xs" href="#loop" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-loop" aria-hidden="true">TOC</a></span></h3>
- <p>Loop video frames.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">loop</samp></dt>
- <dd><p>Set the number of loops. Setting this value to -1 will result in infinite loops.
- Default is 0.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set maximal size in number of frames. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">start</samp></dt>
- <dd><p>Set first frame of loop. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">time</samp></dt>
- <dd><p>Set the time of loop start in seconds.
- Only used if option named <var class="var">start</var> is set to <code class="code">-1</code>.
- </p></dd>
- </dl>
- <a name="Examples-139"></a>
- <h4 class="subsection">39.148.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-139" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-139" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Loop single first frame infinitely:
- <div class="example">
- <pre class="example-preformatted">loop=loop=-1:size=1:start=0
- </pre></div>
- </li><li>Loop single first frame 10 times:
- <div class="example">
- <pre class="example-preformatted">loop=loop=10:size=1:start=0
- </pre></div>
- </li><li>Loop 10 first frames 5 times:
- <div class="example">
- <pre class="example-preformatted">loop=loop=5:size=10:start=0
- </pre></div>
- </li></ul>
- <a name="lut1d"></a>
- <h3 class="section">39.149 lut1d<span class="pull-right"><a class="anchor hidden-xs" href="#lut1d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lut1d" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a 1D LUT to an input video.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">file</samp></dt>
- <dd><p>Set the 1D LUT file name.
- </p>
- <p>Currently supported formats:
- </p><dl class="table">
- <dt>‘<samp class="samp">cube</samp>’</dt>
- <dd><p>Iridas
- </p></dd>
- <dt>‘<samp class="samp">csp</samp>’</dt>
- <dd><p>cineSpace
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Select interpolation mode.
- </p>
- <p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">nearest</samp>’</dt>
- <dd><p>Use values from the nearest defined point.
- </p></dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Interpolate values using the linear interpolation.
- </p></dd>
- <dt>‘<samp class="samp">cosine</samp>’</dt>
- <dd><p>Interpolate values using the cosine interpolation.
- </p></dd>
- <dt>‘<samp class="samp">cubic</samp>’</dt>
- <dd><p>Interpolate values using the cubic interpolation.
- </p></dd>
- <dt>‘<samp class="samp">spline</samp>’</dt>
- <dd><p>Interpolate values using the spline interpolation.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-108"></a>
- <h4 class="subsection">39.149.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-108" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-108" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a class="anchor" id="lut3d"></a><a name="lut3d-1"></a>
- <h3 class="section">39.150 lut3d<span class="pull-right"><a class="anchor hidden-xs" href="#lut3d-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lut3d-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a 3D LUT to an input video.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">file</samp></dt>
- <dd><p>Set the 3D LUT file name.
- </p>
- <p>Currently supported formats:
- </p><dl class="table">
- <dt>‘<samp class="samp">3dl</samp>’</dt>
- <dd><p>AfterEffects
- </p></dd>
- <dt>‘<samp class="samp">cube</samp>’</dt>
- <dd><p>Iridas
- </p></dd>
- <dt>‘<samp class="samp">dat</samp>’</dt>
- <dd><p>DaVinci
- </p></dd>
- <dt>‘<samp class="samp">m3d</samp>’</dt>
- <dd><p>Pandora
- </p></dd>
- <dt>‘<samp class="samp">csp</samp>’</dt>
- <dd><p>cineSpace
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Select interpolation mode.
- </p>
- <p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">nearest</samp>’</dt>
- <dd><p>Use values from the nearest defined point.
- </p></dd>
- <dt>‘<samp class="samp">trilinear</samp>’</dt>
- <dd><p>Interpolate values using the 8 points defining a cube.
- </p></dd>
- <dt>‘<samp class="samp">tetrahedral</samp>’</dt>
- <dd><p>Interpolate values using a tetrahedron.
- </p></dd>
- <dt>‘<samp class="samp">pyramid</samp>’</dt>
- <dd><p>Interpolate values using a pyramid.
- </p></dd>
- <dt>‘<samp class="samp">prism</samp>’</dt>
- <dd><p>Interpolate values using a prism.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-109"></a>
- <h4 class="subsection">39.150.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-109" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-109" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the <code class="code">interp</code> option as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="lumakey"></a>
- <h3 class="section">39.151 lumakey<span class="pull-right"><a class="anchor hidden-xs" href="#lumakey" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lumakey" aria-hidden="true">TOC</a></span></h3>
- <p>Turn certain luma values into transparency.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set the luma which will be used as base for transparency.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">tolerance</samp></dt>
- <dd><p>Set the range of luma values to be keyed out.
- Default value is <code class="code">0.01</code>.
- </p>
- </dd>
- <dt><samp class="option">softness</samp></dt>
- <dd><p>Set the range of softness. Default value is <code class="code">0</code>.
- Use this to control gradual transition from zero to full transparency.
- </p></dd>
- </dl>
- <a name="Commands-110"></a>
- <h4 class="subsection">39.151.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-110" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-110" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a class="anchor" id="lutrgb"></a><a class="anchor" id="lutyuv"></a><a class="anchor" id="lut"></a><a name="lut_002c-lutrgb_002c-lutyuv"></a>
- <h3 class="section">39.152 lut, lutrgb, lutyuv<span class="pull-right"><a class="anchor hidden-xs" href="#lut_002c-lutrgb_002c-lutyuv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lut_002c-lutrgb_002c-lutyuv" aria-hidden="true">TOC</a></span></h3>
- <p>Compute a look-up table for binding each pixel component input value
- to an output value, and apply it to the input video.
- </p>
- <p><var class="var">lutyuv</var> applies a lookup table to a YUV input video, <var class="var">lutrgb</var>
- to an RGB input video.
- </p>
- <p>These filters accept the following parameters:
- </p><dl class="table">
- <dt><samp class="option">c0</samp></dt>
- <dd><p>set first pixel component expression
- </p></dd>
- <dt><samp class="option">c1</samp></dt>
- <dd><p>set second pixel component expression
- </p></dd>
- <dt><samp class="option">c2</samp></dt>
- <dd><p>set third pixel component expression
- </p></dd>
- <dt><samp class="option">c3</samp></dt>
- <dd><p>set fourth pixel component expression, corresponds to the alpha component
- </p>
- </dd>
- <dt><samp class="option">r</samp></dt>
- <dd><p>set red component expression
- </p></dd>
- <dt><samp class="option">g</samp></dt>
- <dd><p>set green component expression
- </p></dd>
- <dt><samp class="option">b</samp></dt>
- <dd><p>set blue component expression
- </p></dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>alpha component expression
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>set Y/luma component expression
- </p></dd>
- <dt><samp class="option">u</samp></dt>
- <dd><p>set U/Cb component expression
- </p></dd>
- <dt><samp class="option">v</samp></dt>
- <dd><p>set V/Cr component expression
- </p></dd>
- </dl>
- <p>Each of them specifies the expression to use for computing the lookup table for
- the corresponding pixel component values.
- </p>
- <p>The exact component associated to each of the <var class="var">c*</var> options depends on the
- format in input.
- </p>
- <p>The <var class="var">lut</var> filter requires either YUV or RGB pixel formats in input,
- <var class="var">lutrgb</var> requires RGB pixel formats in input, and <var class="var">lutyuv</var> requires YUV.
- </p>
- <p>The expressions can contain the following constants and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">val</samp></dt>
- <dd><p>The input value for the pixel component.
- </p>
- </dd>
- <dt><samp class="option">clipval</samp></dt>
- <dd><p>The input value, clipped to the <var class="var">minval</var>-<var class="var">maxval</var> range.
- </p>
- </dd>
- <dt><samp class="option">maxval</samp></dt>
- <dd><p>The maximum value for the pixel component.
- </p>
- </dd>
- <dt><samp class="option">minval</samp></dt>
- <dd><p>The minimum value for the pixel component.
- </p>
- </dd>
- <dt><samp class="option">negval</samp></dt>
- <dd><p>The negated value for the pixel component value, clipped to the
- <var class="var">minval</var>-<var class="var">maxval</var> range; it corresponds to the expression
- "maxval-clipval+minval".
- </p>
- </dd>
- <dt><samp class="option">clip(val)</samp></dt>
- <dd><p>The computed value in <var class="var">val</var>, clipped to the
- <var class="var">minval</var>-<var class="var">maxval</var> range.
- </p>
- </dd>
- <dt><samp class="option">gammaval(gamma)</samp></dt>
- <dd><p>The computed gamma correction value of the pixel component value,
- clipped to the <var class="var">minval</var>-<var class="var">maxval</var> range. It corresponds to the
- expression
- "pow((clipval-minval)/(maxval-minval)\,<var class="var">gamma</var>)*(maxval-minval)+minval"
- </p>
- </dd>
- </dl>
- <p>All expressions default to "clipval".
- </p>
- <a name="Commands-111"></a>
- <h4 class="subsection">39.152.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-111" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-111" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="Examples-140"></a>
- <h4 class="subsection">39.152.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-140" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-140" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Negate input video:
- <div class="example">
- <pre class="example-preformatted">lutrgb="r=maxval+minval-val:g=maxval+minval-val:b=maxval+minval-val"
- lutyuv="y=maxval+minval-val:u=maxval+minval-val:v=maxval+minval-val"
- </pre></div>
- <p>The above is the same as:
- </p><div class="example">
- <pre class="example-preformatted">lutrgb="r=negval:g=negval:b=negval"
- lutyuv="y=negval:u=negval:v=negval"
- </pre></div>
- </li><li>Negate luma:
- <div class="example">
- <pre class="example-preformatted">lutyuv=y=negval
- </pre></div>
- </li><li>Remove chroma components, turning the video into a graytone image:
- <div class="example">
- <pre class="example-preformatted">lutyuv="u=128:v=128"
- </pre></div>
- </li><li>Apply a luma burning effect:
- <div class="example">
- <pre class="example-preformatted">lutyuv="y=2*val"
- </pre></div>
- </li><li>Remove green and blue components:
- <div class="example">
- <pre class="example-preformatted">lutrgb="g=0:b=0"
- </pre></div>
- </li><li>Set a constant alpha channel value on input:
- <div class="example">
- <pre class="example-preformatted">format=rgba,lutrgb=a="maxval-minval/2"
- </pre></div>
- </li><li>Correct luma gamma by a factor of 0.5:
- <div class="example">
- <pre class="example-preformatted">lutyuv=y=gammaval(0.5)
- </pre></div>
- </li><li>Discard least significant bits of luma:
- <div class="example">
- <pre class="example-preformatted">lutyuv=y='bitand(val, 128+64+32)'
- </pre></div>
- </li><li>Technicolor like effect:
- <div class="example">
- <pre class="example-preformatted">lutyuv=u='(val-maxval/2)*2+maxval/2':v='(val-maxval/2)*2+maxval/2'
- </pre></div>
- </li></ul>
- <a name="lut2_002c-tlut2"></a>
- <h3 class="section">39.153 lut2, tlut2<span class="pull-right"><a class="anchor hidden-xs" href="#lut2_002c-tlut2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lut2_002c-tlut2" aria-hidden="true">TOC</a></span></h3>
- <p>The <code class="code">lut2</code> filter takes two input streams and outputs one
- stream.
- </p>
- <p>The <code class="code">tlut2</code> (time lut2) filter takes two consecutive frames
- from one single stream.
- </p>
- <p>This filter accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">c0</samp></dt>
- <dd><p>set first pixel component expression
- </p></dd>
- <dt><samp class="option">c1</samp></dt>
- <dd><p>set second pixel component expression
- </p></dd>
- <dt><samp class="option">c2</samp></dt>
- <dd><p>set third pixel component expression
- </p></dd>
- <dt><samp class="option">c3</samp></dt>
- <dd><p>set fourth pixel component expression, corresponds to the alpha component
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>set output bit depth, only available for <code class="code">lut2</code> filter. By default is 0,
- which means bit depth is automatically picked from first input format.
- </p></dd>
- </dl>
- <p>The <code class="code">lut2</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>Each of them specifies the expression to use for computing the lookup table for
- the corresponding pixel component values.
- </p>
- <p>The exact component associated to each of the <var class="var">c*</var> options depends on the
- format in inputs.
- </p>
- <p>The expressions can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dd><p>The first input value for the pixel component.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The second input value for the pixel component.
- </p>
- </dd>
- <dt><samp class="option">bdx</samp></dt>
- <dd><p>The first input video bit depth.
- </p>
- </dd>
- <dt><samp class="option">bdy</samp></dt>
- <dd><p>The second input video bit depth.
- </p></dd>
- </dl>
- <p>All expressions default to "x".
- </p>
- <a name="Commands-112"></a>
- <h4 class="subsection">39.153.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-112" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-112" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a> except option <code class="code">d</code>.
- </p>
- <a name="Examples-141"></a>
- <h4 class="subsection">39.153.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-141" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-141" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Highlight differences between two RGB video streams:
- <div class="example">
- <pre class="example-preformatted">lut2='ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,0,pow(2,bdx)-1)'
- </pre></div>
- </li><li>Highlight differences between two YUV video streams:
- <div class="example">
- <pre class="example-preformatted">lut2='ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,pow(2,bdx-1),pow(2,bdx)-1):ifnot(x-y,pow(2,bdx-1),pow(2,bdx)-1)'
- </pre></div>
- </li><li>Show max difference between two video streams:
- <div class="example">
- <pre class="example-preformatted">lut2='if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1))):if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1))):if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1)))'
- </pre></div>
- </li></ul>
- <a name="maskedclamp"></a>
- <h3 class="section">39.154 maskedclamp<span class="pull-right"><a class="anchor hidden-xs" href="#maskedclamp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-maskedclamp" aria-hidden="true">TOC</a></span></h3>
- <p>Clamp the first input stream with the second input and third input stream.
- </p>
- <p>Returns the value of first stream to be between second input
- stream - <code class="code">undershoot</code> and third input stream + <code class="code">overshoot</code>.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">undershoot</samp></dt>
- <dd><p>Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">overshoot</samp></dt>
- <dd><p>Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed as bitmap, unprocessed planes will be
- copied from first stream.
- By default value 0xf, all planes will be processed.
- </p></dd>
- </dl>
- <a name="Commands-113"></a>
- <h4 class="subsection">39.154.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-113" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-113" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="maskedmax"></a>
- <h3 class="section">39.155 maskedmax<span class="pull-right"><a class="anchor hidden-xs" href="#maskedmax" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-maskedmax" aria-hidden="true">TOC</a></span></h3>
- <p>Merge the second and third input stream into output stream using absolute differences
- between second input stream and first input stream and absolute difference between
- third input stream and first input stream. The picked value will be from second input
- stream if second absolute difference is greater than first one or from third input stream
- otherwise.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed as bitmap, unprocessed planes will be
- copied from first stream.
- By default value 0xf, all planes will be processed.
- </p></dd>
- </dl>
- <a name="Commands-114"></a>
- <h4 class="subsection">39.155.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-114" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-114" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="maskedmerge"></a>
- <h3 class="section">39.156 maskedmerge<span class="pull-right"><a class="anchor hidden-xs" href="#maskedmerge" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-maskedmerge" aria-hidden="true">TOC</a></span></h3>
- <p>Merge the first input stream with the second input stream using per pixel
- weights in the third input stream.
- </p>
- <p>A value of 0 in the third stream pixel component means that pixel component
- from first stream is returned unchanged, while maximum value (eg. 255 for
- 8-bit videos) means that pixel component from second stream is returned
- unchanged. Intermediate values define the amount of merging between both
- input stream’s pixel components.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed as bitmap, unprocessed planes will be
- copied from first stream.
- By default value 0xf, all planes will be processed.
- </p></dd>
- </dl>
- <a name="Commands-115"></a>
- <h4 class="subsection">39.156.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-115" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-115" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="maskedmin"></a>
- <h3 class="section">39.157 maskedmin<span class="pull-right"><a class="anchor hidden-xs" href="#maskedmin" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-maskedmin" aria-hidden="true">TOC</a></span></h3>
- <p>Merge the second and third input stream into output stream using absolute differences
- between second input stream and first input stream and absolute difference between
- third input stream and first input stream. The picked value will be from second input
- stream if second absolute difference is less than first one or from third input stream
- otherwise.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed as bitmap, unprocessed planes will be
- copied from first stream.
- By default value 0xf, all planes will be processed.
- </p></dd>
- </dl>
- <a name="Commands-116"></a>
- <h4 class="subsection">39.157.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-116" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-116" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="maskedthreshold"></a>
- <h3 class="section">39.158 maskedthreshold<span class="pull-right"><a class="anchor hidden-xs" href="#maskedthreshold" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-maskedthreshold" aria-hidden="true">TOC</a></span></h3>
- <p>Pick pixels comparing absolute difference of two video streams with fixed
- threshold.
- </p>
- <p>If absolute difference between pixel component of first and second video
- stream is equal or lower than user supplied threshold than pixel component
- from first video stream is picked, otherwise pixel component from second
- video stream is picked.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>Set threshold used when picking pixels from absolute difference from two input
- video streams.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed as bitmap, unprocessed planes will be
- copied from second stream.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set mode of filter operation. Can be <code class="code">abs</code> or <code class="code">diff</code>.
- Default is <code class="code">abs</code>.
- </p></dd>
- </dl>
- <a name="Commands-117"></a>
- <h4 class="subsection">39.158.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-117" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-117" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="maskfun"></a>
- <h3 class="section">39.159 maskfun<span class="pull-right"><a class="anchor hidden-xs" href="#maskfun" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-maskfun" aria-hidden="true">TOC</a></span></h3>
- <p>Create mask from input video.
- </p>
- <p>For example it is useful to create motion masks after <code class="code">tblend</code> filter.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">low</samp></dt>
- <dd><p>Set low threshold. Any pixel component lower or exact than this value will be set to 0.
- </p>
- </dd>
- <dt><samp class="option">high</samp></dt>
- <dd><p>Set high threshold. Any pixel component higher than this value will be set to max value
- allowed for current pixel format.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter, by default all available planes are filtered.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>Fill all frame pixels with this value.
- </p>
- </dd>
- <dt><samp class="option">sum</samp></dt>
- <dd><p>Set max average pixel value for frame. If sum of all pixel components is higher that this
- average, output frame will be completely filled with value set by <var class="var">fill</var> option.
- Typically useful for scene changes when used in combination with <code class="code">tblend</code> filter.
- </p></dd>
- </dl>
- <a name="Commands-118"></a>
- <h4 class="subsection">39.159.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-118" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-118" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="mcdeint"></a>
- <h3 class="section">39.160 mcdeint<span class="pull-right"><a class="anchor hidden-xs" href="#mcdeint" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mcdeint" aria-hidden="true">TOC</a></span></h3>
- <p>Apply motion-compensation deinterlacing.
- </p>
- <p>It needs one field per frame as input and must thus be used together
- with yadif=1/3 or equivalent.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the deinterlacing mode.
- </p>
- <p>It accepts one of the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">fast</samp>’</dt>
- <dt>‘<samp class="samp">medium</samp>’</dt>
- <dt>‘<samp class="samp">slow</samp>’</dt>
- <dd><p>use iterative motion estimation
- </p></dd>
- <dt>‘<samp class="samp">extra_slow</samp>’</dt>
- <dd><p>like ‘<samp class="samp">slow</samp>’, but use multiple reference frames.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">fast</samp>’.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>Set the picture field parity assumed for the input video. It must be
- one of the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">0, tff</samp>’</dt>
- <dd><p>assume top field first
- </p></dd>
- <dt>‘<samp class="samp">1, bff</samp>’</dt>
- <dd><p>assume bottom field first
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">bff</samp>’.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set per-block quantization parameter (QP) used by the internal
- encoder.
- </p>
- <p>Higher values should result in a smoother motion vector field but less
- optimal individual vectors. Default value is 1.
- </p></dd>
- </dl>
- <a name="median"></a>
- <h3 class="section">39.161 median<span class="pull-right"><a class="anchor hidden-xs" href="#median" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-median" aria-hidden="true">TOC</a></span></h3>
- <p>Pick median pixel from certain rectangle defined by radius.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set horizontal radius size. Default value is <code class="code">1</code>.
- Allowed range is integer from 1 to 127.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process. Default is <code class="code">15</code>, which is all available planes.
- </p>
- </dd>
- <dt><samp class="option">radiusV</samp></dt>
- <dd><p>Set vertical radius size. Default value is <code class="code">0</code>.
- Allowed range is integer from 0 to 127.
- If it is 0, value will be picked from horizontal <code class="code">radius</code> option.
- </p>
- </dd>
- <dt><samp class="option">percentile</samp></dt>
- <dd><p>Set median percentile. Default value is <code class="code">0.5</code>.
- Default value of <code class="code">0.5</code> will pick always median values, while <code class="code">0</code> will pick
- minimum values, and <code class="code">1</code> maximum values.
- </p></dd>
- </dl>
- <a name="Commands-119"></a>
- <h4 class="subsection">39.161.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-119" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-119" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="mergeplanes"></a>
- <h3 class="section">39.162 mergeplanes<span class="pull-right"><a class="anchor hidden-xs" href="#mergeplanes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mergeplanes" aria-hidden="true">TOC</a></span></h3>
- <p>Merge color channel components from several video streams.
- </p>
- <p>The filter accepts up to 4 input streams, and merge selected input
- planes to the output video.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">mapping</samp></dt>
- <dd><p>Set input to output plane mapping. Default is <code class="code">0</code>.
- </p>
- <p>The mappings is specified as a bitmap. It should be specified as a
- hexadecimal number in the form 0xAa[Bb[Cc[Dd]]]. ’Aa’ describes the
- mapping for the first plane of the output stream. ’A’ sets the number of
- the input stream to use (from 0 to 3), and ’a’ the plane number of the
- corresponding input to use (from 0 to 3). The rest of the mappings is
- similar, ’Bb’ describes the mapping for the output stream second
- plane, ’Cc’ describes the mapping for the output stream third plane and
- ’Dd’ describes the mapping for the output stream fourth plane.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Set output pixel format. Default is <code class="code">yuva444p</code>.
- </p>
- </dd>
- <dt><samp class="option">map0s</samp></dt>
- <dt><samp class="option">map1s</samp></dt>
- <dt><samp class="option">map2s</samp></dt>
- <dt><samp class="option">map3s</samp></dt>
- <dd><p>Set input to output stream mapping for output Nth plane. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">map0p</samp></dt>
- <dt><samp class="option">map1p</samp></dt>
- <dt><samp class="option">map2p</samp></dt>
- <dt><samp class="option">map3p</samp></dt>
- <dd><p>Set input to output plane mapping for output Nth plane. Default is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="Examples-142"></a>
- <h4 class="subsection">39.162.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-142" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-142" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Merge three gray video streams of same width and height into single video stream:
- <div class="example">
- <pre class="example-preformatted">[a0][a1][a2]mergeplanes=0x001020:yuv444p
- </pre></div>
- </li><li>Merge 1st yuv444p stream and 2nd gray video stream into yuva444p video stream:
- <div class="example">
- <pre class="example-preformatted">[a0][a1]mergeplanes=0x00010210:yuva444p
- </pre></div>
- </li><li>Swap Y and A plane in yuva444p stream:
- <div class="example">
- <pre class="example-preformatted">format=yuva444p,mergeplanes=0x03010200:yuva444p
- </pre></div>
- </li><li>Swap U and V plane in yuv420p stream:
- <div class="example">
- <pre class="example-preformatted">format=yuv420p,mergeplanes=0x000201:yuv420p
- </pre></div>
- </li><li>Cast a rgb24 clip to yuv444p:
- <div class="example">
- <pre class="example-preformatted">format=rgb24,mergeplanes=0x000102:yuv444p
- </pre></div>
- </li></ul>
- <a name="mestimate"></a>
- <h3 class="section">39.163 mestimate<span class="pull-right"><a class="anchor hidden-xs" href="#mestimate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mestimate" aria-hidden="true">TOC</a></span></h3>
- <p>Estimate and export motion vectors using block matching algorithms.
- Motion vectors are stored in frame side data to be used by other filters.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">method</samp></dt>
- <dd><p>Specify the motion estimation method. Accepts one of the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">esa</samp>’</dt>
- <dd><p>Exhaustive search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">tss</samp>’</dt>
- <dd><p>Three step search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">tdls</samp>’</dt>
- <dd><p>Two dimensional logarithmic search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">ntss</samp>’</dt>
- <dd><p>New three step search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">fss</samp>’</dt>
- <dd><p>Four step search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">ds</samp>’</dt>
- <dd><p>Diamond search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">hexbs</samp>’</dt>
- <dd><p>Hexagon-based search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">epzs</samp>’</dt>
- <dd><p>Enhanced predictive zonal search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">umh</samp>’</dt>
- <dd><p>Uneven multi-hexagon search algorithm.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">esa</samp>’.
- </p>
- </dd>
- <dt><samp class="option">mb_size</samp></dt>
- <dd><p>Macroblock size. Default <code class="code">16</code>.
- </p>
- </dd>
- <dt><samp class="option">search_param</samp></dt>
- <dd><p>Search parameter. Default <code class="code">7</code>.
- </p></dd>
- </dl>
- <a name="midequalizer"></a>
- <h3 class="section">39.164 midequalizer<span class="pull-right"><a class="anchor hidden-xs" href="#midequalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-midequalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Midway Image Equalization effect using two video streams.
- </p>
- <p>Midway Image Equalization adjusts a pair of images to have the same
- histogram, while maintaining their dynamics as much as possible. It’s
- useful for e.g. matching exposures from a pair of stereo cameras.
- </p>
- <p>This filter has two inputs and one output, which must be of same pixel format, but
- may be of different sizes. The output of filter is first input adjusted with
- midway histogram of both inputs.
- </p>
- <p>This filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process. Default is <code class="code">15</code>, which is all available planes.
- </p></dd>
- </dl>
- <a name="minterpolate"></a>
- <h3 class="section">39.165 minterpolate<span class="pull-right"><a class="anchor hidden-xs" href="#minterpolate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-minterpolate" aria-hidden="true">TOC</a></span></h3>
- <p>Convert the video to specified frame rate using motion interpolation.
- </p>
- <p>This filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">fps</samp></dt>
- <dd><p>Specify the output frame rate. This can be rational e.g. <code class="code">60000/1001</code>. Frames are dropped if <var class="var">fps</var> is lower than source fps. Default <code class="code">60</code>.
- </p>
- </dd>
- <dt><samp class="option">mi_mode</samp></dt>
- <dd><p>Motion interpolation mode. Following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">dup</samp>’</dt>
- <dd><p>Duplicate previous or next frame for interpolating new ones.
- </p></dd>
- <dt>‘<samp class="samp">blend</samp>’</dt>
- <dd><p>Blend source frames. Interpolated frame is mean of previous and next frames.
- </p></dd>
- <dt>‘<samp class="samp">mci</samp>’</dt>
- <dd><p>Motion compensated interpolation. Following options are effective when this mode is selected:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">mc_mode</samp>’</dt>
- <dd><p>Motion compensation mode. Following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">obmc</samp>’</dt>
- <dd><p>Overlapped block motion compensation.
- </p></dd>
- <dt>‘<samp class="samp">aobmc</samp>’</dt>
- <dd><p>Adaptive overlapped block motion compensation. Window weighting coefficients are controlled adaptively according to the reliabilities of the neighboring motion vectors to reduce oversmoothing.
- </p></dd>
- </dl>
- <p>Default mode is ‘<samp class="samp">obmc</samp>’.
- </p>
- </dd>
- <dt>‘<samp class="samp">me_mode</samp>’</dt>
- <dd><p>Motion estimation mode. Following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">bidir</samp>’</dt>
- <dd><p>Bidirectional motion estimation. Motion vectors are estimated for each source frame in both forward and backward directions.
- </p></dd>
- <dt>‘<samp class="samp">bilat</samp>’</dt>
- <dd><p>Bilateral motion estimation. Motion vectors are estimated directly for interpolated frame.
- </p></dd>
- </dl>
- <p>Default mode is ‘<samp class="samp">bilat</samp>’.
- </p>
- </dd>
- <dt>‘<samp class="samp">me</samp>’</dt>
- <dd><p>The algorithm to be used for motion estimation. Following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">esa</samp>’</dt>
- <dd><p>Exhaustive search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">tss</samp>’</dt>
- <dd><p>Three step search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">tdls</samp>’</dt>
- <dd><p>Two dimensional logarithmic search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">ntss</samp>’</dt>
- <dd><p>New three step search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">fss</samp>’</dt>
- <dd><p>Four step search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">ds</samp>’</dt>
- <dd><p>Diamond search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">hexbs</samp>’</dt>
- <dd><p>Hexagon-based search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">epzs</samp>’</dt>
- <dd><p>Enhanced predictive zonal search algorithm.
- </p></dd>
- <dt>‘<samp class="samp">umh</samp>’</dt>
- <dd><p>Uneven multi-hexagon search algorithm.
- </p></dd>
- </dl>
- <p>Default algorithm is ‘<samp class="samp">epzs</samp>’.
- </p>
- </dd>
- <dt>‘<samp class="samp">mb_size</samp>’</dt>
- <dd><p>Macroblock size. Default <code class="code">16</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">search_param</samp>’</dt>
- <dd><p>Motion estimation search parameter. Default <code class="code">32</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">vsbmc</samp>’</dt>
- <dd><p>Enable variable-size block motion compensation. Motion estimation is applied with smaller block sizes at object boundaries in order to make them less blurry. Default is <code class="code">0</code> (disabled).
- </p></dd>
- </dl>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">scd</samp></dt>
- <dd><p>Scene change detection method. Scene change leads motion vectors to be in random direction. Scene change detection replace interpolated frames by duplicate ones. May not be needed for other modes. Following values are accepted:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disable scene change detection.
- </p></dd>
- <dt>‘<samp class="samp">fdiff</samp>’</dt>
- <dd><p>Frame difference. Corresponding pixel values are compared and if it satisfies <var class="var">scd_threshold</var> scene change is detected.
- </p></dd>
- </dl>
- <p>Default method is ‘<samp class="samp">fdiff</samp>’.
- </p>
- </dd>
- <dt><samp class="option">scd_threshold</samp></dt>
- <dd><p>Scene change detection threshold. Default is <code class="code">10.</code>.
- </p></dd>
- </dl>
- <a name="mix"></a>
- <h3 class="section">39.166 mix<span class="pull-right"><a class="anchor hidden-xs" href="#mix" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mix" aria-hidden="true">TOC</a></span></h3>
- <p>Mix several video input streams into one video stream.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>The number of inputs. If unspecified, it defaults to 2.
- </p>
- </dd>
- <dt><samp class="option">weights</samp></dt>
- <dd><p>Specify weight of each input video stream as sequence.
- Each weight is separated by space. If number of weights
- is smaller than number of <var class="var">frames</var> last specified
- weight will be used for all remaining unset weights.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Specify scale, if it is set it will be multiplied with sum
- of each weight multiplied with pixel values to give final destination
- pixel value. By default <var class="var">scale</var> is auto scaled to sum of weights.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default is all. Allowed range is from 0 to 15.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>Specify how end of stream is determined.
- </p><dl class="table">
- <dt>‘<samp class="samp">longest</samp>’</dt>
- <dd><p>The duration of the longest input. (default)
- </p>
- </dd>
- <dt>‘<samp class="samp">shortest</samp>’</dt>
- <dd><p>The duration of the shortest input.
- </p>
- </dd>
- <dt>‘<samp class="samp">first</samp>’</dt>
- <dd><p>The duration of the first input.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-120"></a>
- <h4 class="subsection">39.166.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-120" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-120" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">weights</samp></dt>
- <dt><samp class="option">scale</samp></dt>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Syntax is same as option with same name.
- </p></dd>
- </dl>
- <a name="monochrome"></a>
- <h3 class="section">39.167 monochrome<span class="pull-right"><a class="anchor hidden-xs" href="#monochrome" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-monochrome" aria-hidden="true">TOC</a></span></h3>
- <p>Convert video to gray using custom color filter.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">cb</samp></dt>
- <dd><p>Set the chroma blue spot. Allowed range is from -1 to 1.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">cr</samp></dt>
- <dd><p>Set the chroma red spot. Allowed range is from -1 to 1.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set the color filter size. Allowed range is from .1 to 10.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">high</samp></dt>
- <dd><p>Set the highlights strength. Allowed range is from 0 to 1.
- Default value is 0.
- </p></dd>
- </dl>
- <a name="Commands-121"></a>
- <h4 class="subsection">39.167.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-121" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-121" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="morpho"></a>
- <h3 class="section">39.168 morpho<span class="pull-right"><a class="anchor hidden-xs" href="#morpho" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-morpho" aria-hidden="true">TOC</a></span></h3>
- <p>This filter allows to apply main morphological grayscale transforms,
- erode and dilate with arbitrary structures set in second input stream.
- </p>
- <p>Unlike naive implementation and much slower performance in <a class="ref" href="#erosion">erosion</a>
- and <a class="ref" href="#dilation">dilation</a> filters, when speed is critical <code class="code">morpho</code> filter
- should be used instead.
- </p>
- <p>A description of accepted options follows,
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set morphological transform to apply, can be:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">erode</samp>’</dt>
- <dt>‘<samp class="samp">dilate</samp>’</dt>
- <dt>‘<samp class="samp">open</samp>’</dt>
- <dt>‘<samp class="samp">close</samp>’</dt>
- <dt>‘<samp class="samp">gradient</samp>’</dt>
- <dt>‘<samp class="samp">tophat</samp>’</dt>
- <dt>‘<samp class="samp">blackhat</samp>’</dt>
- </dl>
- <p>Default is <code class="code">erode</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set planes to filter, by default all planes except alpha are filtered.
- </p>
- </dd>
- <dt><samp class="option">structure</samp></dt>
- <dd><p>Set which structure video frames will be processed from second input stream,
- can be <var class="var">first</var> or <var class="var">all</var>. Default is <var class="var">all</var>.
- </p></dd>
- </dl>
- <p>The <code class="code">morpho</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="Commands-122"></a>
- <h4 class="subsection">39.168.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-122" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-122" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="mpdecimate"></a>
- <h3 class="section">39.169 mpdecimate<span class="pull-right"><a class="anchor hidden-xs" href="#mpdecimate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mpdecimate" aria-hidden="true">TOC</a></span></h3>
- <p>Drop frames that do not differ greatly from the previous frame in
- order to reduce frame rate.
- </p>
- <p>The main use of this filter is for very-low-bitrate encoding
- (e.g. streaming over dialup modem), but it could in theory be used for
- fixing movies that were inverse-telecined incorrectly.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">max</samp></dt>
- <dd><p>Set the maximum number of consecutive frames which can be dropped (if
- positive), or the minimum interval between dropped frames (if
- negative). If the value is 0, the frame is dropped disregarding the
- number of previous sequentially dropped frames.
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">keep</samp></dt>
- <dd><p>Set the maximum number of consecutive similar frames to ignore before to start dropping them.
- If the value is 0, the frame is dropped disregarding the
- number of previous sequentially similar frames.
- </p>
- <p>Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">hi</samp></dt>
- <dt><samp class="option">lo</samp></dt>
- <dt><samp class="option">frac</samp></dt>
- <dd><p>Set the dropping threshold values.
- </p>
- <p>Values for <samp class="option">hi</samp> and <samp class="option">lo</samp> are for 8x8 pixel blocks and
- represent actual pixel value differences, so a threshold of 64
- corresponds to 1 unit of difference for each pixel, or the same spread
- out differently over the block.
- </p>
- <p>A frame is a candidate for dropping if no 8x8 blocks differ by more
- than a threshold of <samp class="option">hi</samp>, and if no more than <samp class="option">frac</samp> blocks (1
- meaning the whole image) differ by more than a threshold of <samp class="option">lo</samp>.
- </p>
- <p>Default value for <samp class="option">hi</samp> is 64*12, default value for <samp class="option">lo</samp> is
- 64*5, and default value for <samp class="option">frac</samp> is 0.33.
- </p></dd>
- </dl>
- <a name="msad"></a>
- <h3 class="section">39.170 msad<span class="pull-right"><a class="anchor hidden-xs" href="#msad" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-msad" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the MSAD (Mean Sum of Absolute Differences) between two input videos.
- </p>
- <p>This filter takes two input videos.
- </p>
- <p>Both input videos must have the same resolution and pixel format for
- this filter to work correctly. Also it assumes that both inputs
- have the same number of frames, which are compared one by one.
- </p>
- <p>The obtained per component, average, min and max MSAD is printed through
- the logging system.
- </p>
- <p>The filter stores the calculated MSAD of each frame in frame metadata.
- </p>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>In the below example the input file <samp class="file">main.mpg</samp> being processed is compared
- with the reference file <samp class="file">ref.mpg</samp>.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mpg -lavfi msad -f null -
- </pre></div>
- <a name="multiply"></a>
- <h3 class="section">39.171 multiply<span class="pull-right"><a class="anchor hidden-xs" href="#multiply" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-multiply" aria-hidden="true">TOC</a></span></h3>
- <p>Multiply first video stream pixels values with second video stream pixels values.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set the scale applied to second video stream. By default is <code class="code">1</code>.
- Allowed range is from <code class="code">0</code> to <code class="code">9</code>.
- </p>
- </dd>
- <dt><samp class="option">offset</samp></dt>
- <dd><p>Set the offset applied to second video stream. By default is <code class="code">0.5</code>.
- Allowed range is from <code class="code">-1</code> to <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Specify planes from input video stream that will be processed.
- By default all planes are processed.
- </p></dd>
- </dl>
- <a name="Commands-123"></a>
- <h4 class="subsection">39.171.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-123" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-123" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="negate"></a>
- <h3 class="section">39.172 negate<span class="pull-right"><a class="anchor hidden-xs" href="#negate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-negate" aria-hidden="true">TOC</a></span></h3>
- <p>Negate (invert) the input video.
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">components</samp></dt>
- <dd><p>Set components to negate.
- </p>
- <p>Available values for components are:
- </p><dl class="table">
- <dt>‘<samp class="samp">y</samp>’</dt>
- <dt>‘<samp class="samp">u</samp>’</dt>
- <dt>‘<samp class="samp">v</samp>’</dt>
- <dt>‘<samp class="samp">a</samp>’</dt>
- <dt>‘<samp class="samp">r</samp>’</dt>
- <dt>‘<samp class="samp">g</samp>’</dt>
- <dt>‘<samp class="samp">b</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">negate_alpha</samp></dt>
- <dd><p>With value 1, it negates the alpha component, if present. Default value is 0.
- </p></dd>
- </dl>
- <a name="Commands-124"></a>
- <h4 class="subsection">39.172.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-124" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-124" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a class="anchor" id="nlmeans"></a><a name="nlmeans-1"></a>
- <h3 class="section">39.173 nlmeans<span class="pull-right"><a class="anchor hidden-xs" href="#nlmeans-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-nlmeans-1" aria-hidden="true">TOC</a></span></h3>
- <p>Denoise frames using Non-Local Means algorithm.
- </p>
- <p>Each pixel is adjusted by looking for other pixels with similar contexts. This
- context similarity is defined by comparing their surrounding patches of size
- <samp class="option">p</samp>x<samp class="option">p</samp>. Patches are searched in an area of <samp class="option">r</samp>x<samp class="option">r</samp>
- around the pixel.
- </p>
- <p>Note that the research area defines centers for patches, which means some
- patches will be made of pixels outside that research area.
- </p>
- <p>The filter accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set denoising strength. Default is 1.0. Must be in range [1.0, 30.0].
- </p>
- </dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>Set patch size. Default is 7. Must be odd number in range [0, 99].
- </p>
- </dd>
- <dt><samp class="option">pc</samp></dt>
- <dd><p>Same as <samp class="option">p</samp> but for chroma planes.
- </p>
- <p>The default value is <var class="var">0</var> and means automatic.
- </p>
- </dd>
- <dt><samp class="option">r</samp></dt>
- <dd><p>Set research size. Default is 15. Must be odd number in range [0, 99].
- </p>
- </dd>
- <dt><samp class="option">rc</samp></dt>
- <dd><p>Same as <samp class="option">r</samp> but for chroma planes.
- </p>
- <p>The default value is <var class="var">0</var> and means automatic.
- </p></dd>
- </dl>
- <a name="nnedi"></a>
- <h3 class="section">39.174 nnedi<span class="pull-right"><a class="anchor hidden-xs" href="#nnedi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-nnedi" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlace video using neural network edge directed interpolation.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">weights</samp></dt>
- <dd><p>Mandatory option, without binary file filter can not work.
- Currently file can be found here:
- https://github.com/dubhater/vapoursynth-nnedi3/blob/master/src/nnedi3_weights.bin
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Set which frames to deinterlace, by default it is <code class="code">all</code>.
- Can be <code class="code">all</code> or <code class="code">interlaced</code>.
- </p>
- </dd>
- <dt><samp class="option">field</samp></dt>
- <dd><p>Set mode of operation.
- </p>
- <p>Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">af</samp>’</dt>
- <dd><p>Use frame flags, both fields.
- </p></dd>
- <dt>‘<samp class="samp">a</samp>’</dt>
- <dd><p>Use frame flags, single field.
- </p></dd>
- <dt>‘<samp class="samp">t</samp>’</dt>
- <dd><p>Use top field only.
- </p></dd>
- <dt>‘<samp class="samp">b</samp>’</dt>
- <dd><p>Use bottom field only.
- </p></dd>
- <dt>‘<samp class="samp">tf</samp>’</dt>
- <dd><p>Use both fields, top first.
- </p></dd>
- <dt>‘<samp class="samp">bf</samp>’</dt>
- <dd><p>Use both fields, bottom first.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process, by default filter process all frames.
- </p>
- </dd>
- <dt><samp class="option">nsize</samp></dt>
- <dd><p>Set size of local neighborhood around each pixel, used by the predictor neural
- network.
- </p>
- <p>Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">s8x6</samp>’</dt>
- <dt>‘<samp class="samp">s16x6</samp>’</dt>
- <dt>‘<samp class="samp">s32x6</samp>’</dt>
- <dt>‘<samp class="samp">s48x6</samp>’</dt>
- <dt>‘<samp class="samp">s8x4</samp>’</dt>
- <dt>‘<samp class="samp">s16x4</samp>’</dt>
- <dt>‘<samp class="samp">s32x4</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">nns</samp></dt>
- <dd><p>Set the number of neurons in predictor neural network.
- Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">n16</samp>’</dt>
- <dt>‘<samp class="samp">n32</samp>’</dt>
- <dt>‘<samp class="samp">n64</samp>’</dt>
- <dt>‘<samp class="samp">n128</samp>’</dt>
- <dt>‘<samp class="samp">n256</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">qual</samp></dt>
- <dd><p>Controls the number of different neural network predictions that are blended
- together to compute the final output value. Can be <code class="code">fast</code>, default or
- <code class="code">slow</code>.
- </p>
- </dd>
- <dt><samp class="option">etype</samp></dt>
- <dd><p>Set which set of weights to use in the predictor.
- Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">a, abs</samp>’</dt>
- <dd><p>weights trained to minimize absolute error
- </p></dd>
- <dt>‘<samp class="samp">s, mse</samp>’</dt>
- <dd><p>weights trained to minimize squared error
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">pscrn</samp></dt>
- <dd><p>Controls whether or not the prescreener neural network is used to decide
- which pixels should be processed by the predictor neural network and which
- can be handled by simple cubic interpolation.
- The prescreener is trained to know whether cubic interpolation will be
- sufficient for a pixel or whether it should be predicted by the predictor nn.
- The computational complexity of the prescreener nn is much less than that of
- the predictor nn. Since most pixels can be handled by cubic interpolation,
- using the prescreener generally results in much faster processing.
- The prescreener is pretty accurate, so the difference between using it and not
- using it is almost always unnoticeable.
- </p>
- <p>Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dt>‘<samp class="samp">original</samp>’</dt>
- <dt>‘<samp class="samp">new</samp>’</dt>
- <dt>‘<samp class="samp">new2</samp>’</dt>
- <dt>‘<samp class="samp">new3</samp>’</dt>
- </dl>
- <p>Default is <code class="code">new</code>.
- </p></dd>
- </dl>
- <a name="Commands-125"></a>
- <h4 class="subsection">39.174.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-125" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-125" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options, excluding <var class="var">weights</var> option.
- </p>
- <a name="noformat"></a>
- <h3 class="section">39.175 noformat<span class="pull-right"><a class="anchor hidden-xs" href="#noformat" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-noformat" aria-hidden="true">TOC</a></span></h3>
- <p>Force libavfilter not to use any of the specified pixel formats for the
- input to the next filter.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">pix_fmts</samp></dt>
- <dd><p>A ’|’-separated list of pixel format names, such as
- pix_fmts=yuv420p|monow|rgb24".
- </p>
- </dd>
- </dl>
- <a name="Examples-143"></a>
- <h4 class="subsection">39.175.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-143" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-143" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Force libavfilter to use a format different from <var class="var">yuv420p</var> for the
- input to the vflip filter:
- <div class="example">
- <pre class="example-preformatted">noformat=pix_fmts=yuv420p,vflip
- </pre></div>
- </li><li>Convert the input video to any of the formats not contained in the list:
- <div class="example">
- <pre class="example-preformatted">noformat=yuv420p|yuv444p|yuv410p
- </pre></div>
- </li></ul>
- <a name="noise-1"></a>
- <h3 class="section">39.176 noise<span class="pull-right"><a class="anchor hidden-xs" href="#noise-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-noise-1" aria-hidden="true">TOC</a></span></h3>
- <p>Add noise on video input frame.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">all_seed</samp></dt>
- <dt><samp class="option">c0_seed</samp></dt>
- <dt><samp class="option">c1_seed</samp></dt>
- <dt><samp class="option">c2_seed</samp></dt>
- <dt><samp class="option">c3_seed</samp></dt>
- <dd><p>Set noise seed for specific pixel component or all pixel components in case
- of <var class="var">all_seed</var>. Default value is <code class="code">123457</code>.
- </p>
- </dd>
- <dt><samp class="option">all_strength, alls</samp></dt>
- <dt><samp class="option">c0_strength, c0s</samp></dt>
- <dt><samp class="option">c1_strength, c1s</samp></dt>
- <dt><samp class="option">c2_strength, c2s</samp></dt>
- <dt><samp class="option">c3_strength, c3s</samp></dt>
- <dd><p>Set noise strength for specific pixel component or all pixel components in case
- <var class="var">all_strength</var>. Default value is <code class="code">0</code>. Allowed range is [0, 100].
- </p>
- </dd>
- <dt><samp class="option">all_flags, allf</samp></dt>
- <dt><samp class="option">c0_flags, c0f</samp></dt>
- <dt><samp class="option">c1_flags, c1f</samp></dt>
- <dt><samp class="option">c2_flags, c2f</samp></dt>
- <dt><samp class="option">c3_flags, c3f</samp></dt>
- <dd><p>Set pixel component flags or set flags for all components if <var class="var">all_flags</var>.
- Available values for component flags are:
- </p><dl class="table">
- <dt>‘<samp class="samp">a</samp>’</dt>
- <dd><p>averaged temporal noise (smoother)
- </p></dd>
- <dt>‘<samp class="samp">p</samp>’</dt>
- <dd><p>mix random noise with a (semi)regular pattern
- </p></dd>
- <dt>‘<samp class="samp">t</samp>’</dt>
- <dd><p>temporal noise (noise pattern changes between frames)
- </p></dd>
- <dt>‘<samp class="samp">u</samp>’</dt>
- <dd><p>uniform noise (gaussian otherwise)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-144"></a>
- <h4 class="subsection">39.176.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-144" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-144" aria-hidden="true">TOC</a></span></h4>
- <p>Add temporal and uniform noise to input video:
- </p><div class="example">
- <pre class="example-preformatted">noise=alls=20:allf=t+u
- </pre></div>
- <a name="normalize"></a>
- <h3 class="section">39.177 normalize<span class="pull-right"><a class="anchor hidden-xs" href="#normalize" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-normalize" aria-hidden="true">TOC</a></span></h3>
- <p>Normalize RGB video (aka histogram stretching, contrast stretching).
- See: https://en.wikipedia.org/wiki/Normalization_(image_processing)
- </p>
- <p>For each channel of each frame, the filter computes the input range and maps
- it linearly to the user-specified output range. The output range defaults
- to the full dynamic range from pure black to pure white.
- </p>
- <p>Temporal smoothing can be used on the input range to reduce flickering (rapid
- changes in brightness) caused when small dark or bright objects enter or leave
- the scene. This is similar to the auto-exposure (automatic gain control) on a
- video camera, and, like a video camera, it may cause a period of over- or
- under-exposure of the video.
- </p>
- <p>The R,G,B channels can be normalized independently, which may cause some
- color shifting, or linked together as a single channel, which prevents
- color shifting. Linked normalization preserves hue. Independent normalization
- does not, so it can be used to remove some color casts. Independent and linked
- normalization can be combined in any ratio.
- </p>
- <p>The normalize filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">blackpt</samp></dt>
- <dt><samp class="option">whitept</samp></dt>
- <dd><p>Colors which define the output range. The minimum input value is mapped to
- the <var class="var">blackpt</var>. The maximum input value is mapped to the <var class="var">whitept</var>.
- The defaults are black and white respectively. Specifying white for
- <var class="var">blackpt</var> and black for <var class="var">whitept</var> will give color-inverted,
- normalized video. Shades of grey can be used to reduce the dynamic range
- (contrast). Specifying saturated colors here can create some interesting
- effects.
- </p>
- </dd>
- <dt><samp class="option">smoothing</samp></dt>
- <dd><p>The number of previous frames to use for temporal smoothing. The input range
- of each channel is smoothed using a rolling average over the current frame
- and the <var class="var">smoothing</var> previous frames. The default is 0 (no temporal
- smoothing).
- </p>
- </dd>
- <dt><samp class="option">independence</samp></dt>
- <dd><p>Controls the ratio of independent (color shifting) channel normalization to
- linked (color preserving) normalization. 0.0 is fully linked, 1.0 is fully
- independent. Defaults to 1.0 (fully independent).
- </p>
- </dd>
- <dt><samp class="option">strength</samp></dt>
- <dd><p>Overall strength of the filter. 1.0 is full strength. 0.0 is a rather
- expensive no-op. Defaults to 1.0 (full strength).
- </p>
- </dd>
- </dl>
- <a name="Commands-126"></a>
- <h4 class="subsection">39.177.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-126" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-126" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options, excluding <var class="var">smoothing</var> option.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="Examples-145"></a>
- <h4 class="subsection">39.177.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-145" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-145" aria-hidden="true">TOC</a></span></h4>
- <p>Stretch video contrast to use the full dynamic range, with no temporal
- smoothing; may flicker depending on the source content:
- </p><div class="example">
- <pre class="example-preformatted">normalize=blackpt=black:whitept=white:smoothing=0
- </pre></div>
- <p>As above, but with 50 frames of temporal smoothing; flicker should be
- reduced, depending on the source content:
- </p><div class="example">
- <pre class="example-preformatted">normalize=blackpt=black:whitept=white:smoothing=50
- </pre></div>
- <p>As above, but with hue-preserving linked channel normalization:
- </p><div class="example">
- <pre class="example-preformatted">normalize=blackpt=black:whitept=white:smoothing=50:independence=0
- </pre></div>
- <p>As above, but with half strength:
- </p><div class="example">
- <pre class="example-preformatted">normalize=blackpt=black:whitept=white:smoothing=50:independence=0:strength=0.5
- </pre></div>
- <p>Map the darkest input color to red, the brightest input color to cyan:
- </p><div class="example">
- <pre class="example-preformatted">normalize=blackpt=red:whitept=cyan
- </pre></div>
- <a name="null-2"></a>
- <h3 class="section">39.178 null<span class="pull-right"><a class="anchor hidden-xs" href="#null-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-null-2" aria-hidden="true">TOC</a></span></h3>
- <p>Pass the video source unchanged to the output.
- </p>
- <a name="ocr"></a>
- <h3 class="section">39.179 ocr<span class="pull-right"><a class="anchor hidden-xs" href="#ocr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ocr" aria-hidden="true">TOC</a></span></h3>
- <p>Optical Character Recognition
- </p>
- <p>This filter uses Tesseract for optical character recognition. To enable
- compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-libtesseract</code>.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">datapath</samp></dt>
- <dd><p>Set datapath to tesseract data. Default is to use whatever was
- set at installation.
- </p>
- </dd>
- <dt><samp class="option">language</samp></dt>
- <dd><p>Set language, default is "eng".
- </p>
- </dd>
- <dt><samp class="option">whitelist</samp></dt>
- <dd><p>Set character whitelist.
- </p>
- </dd>
- <dt><samp class="option">blacklist</samp></dt>
- <dd><p>Set character blacklist.
- </p></dd>
- </dl>
- <p>The filter exports recognized text as the frame metadata <code class="code">lavfi.ocr.text</code>.
- The filter exports confidence of recognized words as the frame metadata <code class="code">lavfi.ocr.confidence</code>.
- </p>
- <a name="ocv"></a>
- <h3 class="section">39.180 ocv<span class="pull-right"><a class="anchor hidden-xs" href="#ocv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ocv" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a video transform using libopencv.
- </p>
- <p>To enable this filter, install the libopencv library and headers and
- configure FFmpeg with <code class="code">--enable-libopencv</code>.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">filter_name</samp></dt>
- <dd><p>The name of the libopencv filter to apply.
- </p>
- </dd>
- <dt><samp class="option">filter_params</samp></dt>
- <dd><p>The parameters to pass to the libopencv filter. If not specified, the default
- values are assumed.
- </p>
- </dd>
- </dl>
- <p>Refer to the official libopencv documentation for more precise
- information:
- <a class="url" href="http://docs.opencv.org/master/modules/imgproc/doc/filtering.html">http://docs.opencv.org/master/modules/imgproc/doc/filtering.html</a>
- </p>
- <p>Several libopencv filters are supported; see the following subsections.
- </p>
- <a class="anchor" id="dilate"></a><a name="dilate-1"></a>
- <h4 class="subsection">39.180.1 dilate<span class="pull-right"><a class="anchor hidden-xs" href="#dilate-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dilate-1" aria-hidden="true">TOC</a></span></h4>
- <p>Dilate an image by using a specific structuring element.
- It corresponds to the libopencv function <code class="code">cvDilate</code>.
- </p>
- <p>It accepts the parameters: <var class="var">struct_el</var>|<var class="var">nb_iterations</var>.
- </p>
- <p><var class="var">struct_el</var> represents a structuring element, and has the syntax:
- <var class="var">cols</var>x<var class="var">rows</var>+<var class="var">anchor_x</var>x<var class="var">anchor_y</var>/<var class="var">shape</var>
- </p>
- <p><var class="var">cols</var> and <var class="var">rows</var> represent the number of columns and rows of
- the structuring element, <var class="var">anchor_x</var> and <var class="var">anchor_y</var> the anchor
- point, and <var class="var">shape</var> the shape for the structuring element. <var class="var">shape</var>
- must be "rect", "cross", "ellipse", or "custom".
- </p>
- <p>If the value for <var class="var">shape</var> is "custom", it must be followed by a
- string of the form "=<var class="var">filename</var>". The file with name
- <var class="var">filename</var> is assumed to represent a binary image, with each
- printable character corresponding to a bright pixel. When a custom
- <var class="var">shape</var> is used, <var class="var">cols</var> and <var class="var">rows</var> are ignored, the number
- or columns and rows of the read file are assumed instead.
- </p>
- <p>The default value for <var class="var">struct_el</var> is "3x3+0x0/rect".
- </p>
- <p><var class="var">nb_iterations</var> specifies the number of times the transform is
- applied to the image, and defaults to 1.
- </p>
- <p>Some examples:
- </p><div class="example">
- <pre class="example-preformatted"># Use the default values
- ocv=dilate
- # Dilate using a structuring element with a 5x5 cross, iterating two times
- ocv=filter_name=dilate:filter_params=5x5+2x2/cross|2
- # Read the shape from the file diamond.shape, iterating two times.
- # The file diamond.shape may contain a pattern of characters like this
- # *
- # ***
- # *****
- # ***
- # *
- # The specified columns and rows are ignored
- # but the anchor point coordinates are not
- ocv=dilate:0x0+2x2/custom=diamond.shape|2
- </pre></div>
- <a name="erode"></a>
- <h4 class="subsection">39.180.2 erode<span class="pull-right"><a class="anchor hidden-xs" href="#erode" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-erode" aria-hidden="true">TOC</a></span></h4>
- <p>Erode an image by using a specific structuring element.
- It corresponds to the libopencv function <code class="code">cvErode</code>.
- </p>
- <p>It accepts the parameters: <var class="var">struct_el</var>:<var class="var">nb_iterations</var>,
- with the same syntax and semantics as the <a class="ref" href="#dilate">dilate</a> filter.
- </p>
- <a name="smooth"></a>
- <h4 class="subsection">39.180.3 smooth<span class="pull-right"><a class="anchor hidden-xs" href="#smooth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-smooth" aria-hidden="true">TOC</a></span></h4>
- <p>Smooth the input video.
- </p>
- <p>The filter takes the following parameters:
- <var class="var">type</var>|<var class="var">param1</var>|<var class="var">param2</var>|<var class="var">param3</var>|<var class="var">param4</var>.
- </p>
- <p><var class="var">type</var> is the type of smooth filter to apply, and must be one of
- the following values: "blur", "blur_no_scale", "median", "gaussian",
- or "bilateral". The default value is "gaussian".
- </p>
- <p>The meaning of <var class="var">param1</var>, <var class="var">param2</var>, <var class="var">param3</var>, and <var class="var">param4</var>
- depends on the smooth type. <var class="var">param1</var> and
- <var class="var">param2</var> accept integer positive values or 0. <var class="var">param3</var> and
- <var class="var">param4</var> accept floating point values.
- </p>
- <p>The default value for <var class="var">param1</var> is 3. The default value for the
- other parameters is 0.
- </p>
- <p>These parameters correspond to the parameters assigned to the
- libopencv function <code class="code">cvSmooth</code>.
- </p>
- <a name="oscilloscope"></a>
- <h3 class="section">39.181 oscilloscope<span class="pull-right"><a class="anchor hidden-xs" href="#oscilloscope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-oscilloscope" aria-hidden="true">TOC</a></span></h3>
- <p>2D Video Oscilloscope.
- </p>
- <p>Useful to measure spatial impulse, step responses, chroma delays, etc.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set scope center x position.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set scope center y position.
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set scope size, relative to frame diagonal.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>Set scope tilt/rotation.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Set trace opacity.
- </p>
- </dd>
- <dt><samp class="option">tx</samp></dt>
- <dd><p>Set trace center x position.
- </p>
- </dd>
- <dt><samp class="option">ty</samp></dt>
- <dd><p>Set trace center y position.
- </p>
- </dd>
- <dt><samp class="option">tw</samp></dt>
- <dd><p>Set trace width, relative to width of frame.
- </p>
- </dd>
- <dt><samp class="option">th</samp></dt>
- <dd><p>Set trace height, relative to height of frame.
- </p>
- </dd>
- <dt><samp class="option">c</samp></dt>
- <dd><p>Set which components to trace. By default it traces first three components.
- </p>
- </dd>
- <dt><samp class="option">g</samp></dt>
- <dd><p>Draw trace grid. By default is enabled.
- </p>
- </dd>
- <dt><samp class="option">st</samp></dt>
- <dd><p>Draw some statistics. By default is enabled.
- </p>
- </dd>
- <dt><samp class="option">sc</samp></dt>
- <dd><p>Draw scope. By default is enabled.
- </p></dd>
- </dl>
- <a name="Commands-127"></a>
- <h4 class="subsection">39.181.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-127" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-127" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p>
- <a name="Examples-146"></a>
- <h4 class="subsection">39.181.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-146" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-146" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Inspect full first row of video frame.
- <div class="example">
- <pre class="example-preformatted">oscilloscope=x=0.5:y=0:s=1
- </pre></div>
- </li><li>Inspect full last row of video frame.
- <div class="example">
- <pre class="example-preformatted">oscilloscope=x=0.5:y=1:s=1
- </pre></div>
- </li><li>Inspect full 5th line of video frame of height 1080.
- <div class="example">
- <pre class="example-preformatted">oscilloscope=x=0.5:y=5/1080:s=1
- </pre></div>
- </li><li>Inspect full last column of video frame.
- <div class="example">
- <pre class="example-preformatted">oscilloscope=x=1:y=0.5:s=1:t=1
- </pre></div>
- </li></ul>
- <a class="anchor" id="overlay"></a><a name="overlay-1"></a>
- <h3 class="section">39.182 overlay<span class="pull-right"><a class="anchor hidden-xs" href="#overlay-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-overlay-1" aria-hidden="true">TOC</a></span></h3>
- <p>Overlay one video on top of another.
- </p>
- <p>It takes two inputs and has one output. The first input is the "main"
- video on which the second input is overlaid.
- </p>
- <p>It accepts the following parameters:
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set the expression for the x and y coordinates of the overlaid video
- on the main video. Default value is "0" for both expressions. In case
- the expression is invalid, it is set to a huge value (meaning that the
- overlay will not be displayed within the output visible area).
- </p>
- </dd>
- <dt><samp class="option">eof_action</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set when the expressions for <samp class="option">x</samp>, and <samp class="option">y</samp> are evaluated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>only evaluate expressions once during the filter initialization or
- when a command is processed
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>evaluate expressions for each incoming frame
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">frame</samp>’.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Set the format for the output video.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">yuv420</samp>’</dt>
- <dd><p>force YUV 4:2:0 8-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv420p10</samp>’</dt>
- <dd><p>force YUV 4:2:0 10-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv422</samp>’</dt>
- <dd><p>force YUV 4:2:2 8-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv422p10</samp>’</dt>
- <dd><p>force YUV 4:2:2 10-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv444</samp>’</dt>
- <dd><p>force YUV 4:4:4 8-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">yuv444p10</samp>’</dt>
- <dd><p>force YUV 4:4:4 10-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">rgb</samp>’</dt>
- <dd><p>force RGB 8-bit packed output
- </p>
- </dd>
- <dt>‘<samp class="samp">gbrp</samp>’</dt>
- <dd><p>force RGB 8-bit planar output
- </p>
- </dd>
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>automatically pick format
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">yuv420</samp>’.
- </p>
- </dd>
- <dt><samp class="option">repeatlast</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>Set format of alpha of the overlaid video, it can be <var class="var">straight</var> or
- <var class="var">premultiplied</var>, or <var class="var">auto</var> to choose the alpha mode automatically.
- Default is <var class="var">auto</var>.
- </p></dd>
- </dl>
- <p>The <samp class="option">x</samp>, and <samp class="option">y</samp> expressions can contain the following
- parameters.
- </p>
- <dl class="table">
- <dt><samp class="option">main_w, W</samp></dt>
- <dt><samp class="option">main_h, H</samp></dt>
- <dd><p>The main input width and height.
- </p>
- </dd>
- <dt><samp class="option">overlay_w, w</samp></dt>
- <dt><samp class="option">overlay_h, h</samp></dt>
- <dd><p>The overlay input width and height.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The computed values for <var class="var">x</var> and <var class="var">y</var>. They are evaluated for
- each new frame.
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values of the output
- format. For example for the pixel format "yuv422p" <var class="var">hsub</var> is 2 and
- <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>the number of input frame, starting from 0
- </p>
- </dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>the position in the file of the input frame, NAN if unknown; deprecated,
- do not use
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The timestamp, expressed in seconds. It’s NAN if the input timestamp is unknown.
- </p>
- </dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>Note that the <var class="var">n</var>, <var class="var">t</var> variables are available only
- when evaluation is done <em class="emph">per frame</em>, and will evaluate to NAN
- when <samp class="option">eval</samp> is set to ‘<samp class="samp">init</samp>’.
- </p>
- <p>Be aware that frames are taken from each input video in timestamp
- order, hence, if their initial timestamps differ, it is a good idea
- to pass the two inputs through a <var class="var">setpts=PTS-STARTPTS</var> filter to
- have them begin in the same zero timestamp, as the example for
- the <var class="var">movie</var> filter does.
- </p>
- <p>You can chain together more overlays but you should test the
- efficiency of such approach.
- </p>
- <a name="Commands-128"></a>
- <h4 class="subsection">39.182.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-128" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-128" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Modify the x and y of the overlay input.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="Examples-147"></a>
- <h4 class="subsection">39.182.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-147" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-147" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Draw the overlay at 10 pixels from the bottom right corner of the main
- video:
- <div class="example">
- <pre class="example-preformatted">overlay=main_w-overlay_w-10:main_h-overlay_h-10
- </pre></div>
- <p>Using named options the example above becomes:
- </p><div class="example">
- <pre class="example-preformatted">overlay=x=main_w-overlay_w-10:y=main_h-overlay_h-10
- </pre></div>
- </li><li>Insert a transparent PNG logo in the bottom left corner of the input,
- using the <code class="command">ffmpeg</code> tool with the <code class="code">-filter_complex</code> option:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10' output
- </pre></div>
- </li><li>Insert 2 different transparent PNG logos (second logo on bottom
- right corner) using the <code class="command">ffmpeg</code> tool:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -i logo1 -i logo2 -filter_complex 'overlay=x=10:y=H-h-10,overlay=x=W-w-10:y=H-h-10' output
- </pre></div>
- </li><li>Add a transparent color layer on top of the main video; <code class="code">WxH</code>
- must specify the size of the main input to the overlay filter:
- <div class="example">
- <pre class="example-preformatted">color=color=red@.3:size=WxH [over]; [in][over] overlay [out]
- </pre></div>
- </li><li>Play an original video and a filtered version (here with the deshake
- filter) side by side using the <code class="command">ffplay</code> tool:
- <div class="example">
- <pre class="example-preformatted">ffplay input.avi -vf 'split[a][b]; [a]pad=iw*2:ih[src]; [b]deshake[filt]; [src][filt]overlay=w'
- </pre></div>
- <p>The above command is the same as:
- </p><div class="example">
- <pre class="example-preformatted">ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
- </pre></div>
- </li><li>Make a sliding overlay appearing from the left to the right top part of the
- screen starting since time 2:
- <div class="example">
- <pre class="example-preformatted">overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0
- </pre></div>
- </li><li>Compose output by putting two input videos side to side:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i left.avi -i right.avi -filter_complex "
- nullsrc=size=200x100 [background];
- [0:v] setpts=PTS-STARTPTS, scale=100x100 [left];
- [1:v] setpts=PTS-STARTPTS, scale=100x100 [right];
- [background][left] overlay=shortest=1 [background+left];
- [background+left][right] overlay=shortest=1:x=100 [left+right]
- "
- </pre></div>
- </li><li>Mask 10-20 seconds of a video by applying the delogo filter to a section
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i test.avi -codec:v:0 wmv2 -ar 11025 -b:v 9000k
- -vf '[in]split[split_main][split_delogo];[split_delogo]trim=start=360:end=371,delogo=0:0:640:480[delogoed];[split_main][delogoed]overlay=eof_action=pass[out]'
- masked.avi
- </pre></div>
- </li><li>Chain several overlays in cascade:
- <div class="example">
- <pre class="example-preformatted">nullsrc=s=200x200 [bg];
- testsrc=s=100x100, split=4 [in0][in1][in2][in3];
- [in0] lutrgb=r=0, [bg] overlay=0:0 [mid0];
- [in1] lutrgb=g=0, [mid0] overlay=100:0 [mid1];
- [in2] lutrgb=b=0, [mid1] overlay=0:100 [mid2];
- [in3] null, [mid2] overlay=100:100 [out0]
- </pre></div>
- </li></ul>
- <a name="owdenoise"></a>
- <h3 class="section">39.183 owdenoise<span class="pull-right"><a class="anchor hidden-xs" href="#owdenoise" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-owdenoise" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Overcomplete Wavelet denoiser.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">depth</samp></dt>
- <dd><p>Set depth.
- </p>
- <p>Larger depth values will denoise lower frequency components more, but
- slow down filtering.
- </p>
- <p>Must be an int in the range 8-16, default is <code class="code">8</code>.
- </p>
- </dd>
- <dt><samp class="option">luma_strength, ls</samp></dt>
- <dd><p>Set luma strength.
- </p>
- <p>Must be a double value in the range 0-1000, default is <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">chroma_strength, cs</samp></dt>
- <dd><p>Set chroma strength.
- </p>
- <p>Must be a double value in the range 0-1000, default is <code class="code">1.0</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="pad"></a><a name="pad-1"></a>
- <h3 class="section">39.184 pad<span class="pull-right"><a class="anchor hidden-xs" href="#pad-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pad-1" aria-hidden="true">TOC</a></span></h3>
- <p>Add paddings to the input image, and place the original input at the
- provided <var class="var">x</var>, <var class="var">y</var> coordinates.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Specify an expression for the size of the output image with the
- paddings added. If the value for <var class="var">width</var> or <var class="var">height</var> is 0, the
- corresponding input size is used for the output.
- </p>
- <p>The <var class="var">width</var> expression can reference the value set by the
- <var class="var">height</var> expression, and vice versa.
- </p>
- <p>The default value of <var class="var">width</var> and <var class="var">height</var> is 0.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Specify the offsets to place the input image at within the padded area,
- with respect to the top/left border of the output image.
- </p>
- <p>The <var class="var">x</var> expression can reference the value set by the <var class="var">y</var>
- expression, and vice versa.
- </p>
- <p>The default value of <var class="var">x</var> and <var class="var">y</var> is 0.
- </p>
- <p>If <var class="var">x</var> or <var class="var">y</var> evaluate to a negative number, they’ll be changed
- so the input image is centered on the padded area.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify the color of the padded area. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>.
- </p>
- <p>The default value of <var class="var">color</var> is "black".
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Specify when to evaluate <var class="var">width</var>, <var class="var">height</var>, <var class="var">x</var> and <var class="var">y</var> expression.
- </p>
- <p>It accepts the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>Only evaluate expressions once during the filter initialization or when
- a command is processed.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Evaluate expressions for each incoming frame.
- </p>
- </dd>
- </dl>
- <p>Default value is ‘<samp class="samp">init</samp>’.
- </p>
- </dd>
- <dt><samp class="option">aspect</samp></dt>
- <dd><p>Pad to aspect instead to a resolution.
- </p>
- </dd>
- </dl>
- <p>The value for the <var class="var">width</var>, <var class="var">height</var>, <var class="var">x</var>, and <var class="var">y</var>
- options are expressions containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">in_w</samp></dt>
- <dt><samp class="option">in_h</samp></dt>
- <dd><p>The input video width and height.
- </p>
- </dd>
- <dt><samp class="option">iw</samp></dt>
- <dt><samp class="option">ih</samp></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><samp class="option">out_w</samp></dt>
- <dt><samp class="option">out_h</samp></dt>
- <dd><p>The output width and height (the size of the padded area), as
- specified by the <var class="var">width</var> and <var class="var">height</var> expressions.
- </p>
- </dd>
- <dt><samp class="option">ow</samp></dt>
- <dt><samp class="option">oh</samp></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The x and y offsets as specified by the <var class="var">x</var> and <var class="var">y</var>
- expressions, or NAN if not yet specified.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">iw</var> / <var class="var">ih</var>) * <var class="var">sar</var>
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>The horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p></dd>
- </dl>
- <a name="Examples-148"></a>
- <h4 class="subsection">39.184.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-148" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-148" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Add paddings with the color "violet" to the input video. The output video
- size is 640x480, and the top-left corner of the input video is placed at
- column 0, row 40
- <div class="example">
- <pre class="example-preformatted">pad=640:480:0:40:violet
- </pre></div>
- <p>The example above is equivalent to the following command:
- </p><div class="example">
- <pre class="example-preformatted">pad=width=640:height=480:x=0:y=40:color=violet
- </pre></div>
- </li><li>Pad the input to get an output with dimensions increased by 3/2,
- and put the input video at the center of the padded area:
- <div class="example">
- <pre class="example-preformatted">pad="3/2*iw:3/2*ih:(ow-iw)/2:(oh-ih)/2"
- </pre></div>
- </li><li>Pad the input to get a squared output with size equal to the maximum
- value between the input width and height, and put the input video at
- the center of the padded area:
- <div class="example">
- <pre class="example-preformatted">pad="max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2"
- </pre></div>
- </li><li>Pad the input to get a final w/h ratio of 16:9:
- <div class="example">
- <pre class="example-preformatted">pad="ih*16/9:ih:(ow-iw)/2:(oh-ih)/2"
- </pre></div>
- </li><li>In case of anamorphic video, in order to set the output display aspect
- correctly, it is necessary to use <var class="var">sar</var> in the expression,
- according to the relation:
- <div class="example">
- <pre class="example-preformatted">(ih * X / ih) * sar = output_dar
- X = output_dar / sar
- </pre></div>
- <p>Thus the previous example needs to be modified to:
- </p><div class="example">
- <pre class="example-preformatted">pad="ih*16/9/sar:ih:(ow-iw)/2:(oh-ih)/2"
- </pre></div>
- </li><li>Double the output size and put the input video in the bottom-right
- corner of the output padded area:
- <div class="example">
- <pre class="example-preformatted">pad="2*iw:2*ih:ow-iw:oh-ih"
- </pre></div>
- </li></ul>
- <a class="anchor" id="palettegen"></a><a name="palettegen-1"></a>
- <h3 class="section">39.185 palettegen<span class="pull-right"><a class="anchor hidden-xs" href="#palettegen-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-palettegen-1" aria-hidden="true">TOC</a></span></h3>
- <p>Generate one palette for a whole video stream.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">max_colors</samp></dt>
- <dd><p>Set the maximum number of colors to quantize in the palette.
- Note: the palette will still contain 256 colors; the unused palette entries
- will be black.
- </p>
- </dd>
- <dt><samp class="option">reserve_transparent</samp></dt>
- <dd><p>Create a palette of 255 colors maximum and reserve the last one for
- transparency. Reserving the transparency color is useful for GIF optimization.
- If not set, the maximum of colors in the palette will be 256. You probably want
- to disable this option for a standalone image.
- Set by default.
- </p>
- </dd>
- <dt><samp class="option">transparency_color</samp></dt>
- <dd><p>Set the color that will be used as background for transparency.
- </p>
- </dd>
- <dt><samp class="option">stats_mode</samp></dt>
- <dd><p>Set statistics mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>Compute full frame histograms.
- </p></dd>
- <dt>‘<samp class="samp">diff</samp>’</dt>
- <dd><p>Compute histograms only for the part that differs from previous frame. This
- might be relevant to give more importance to the moving part of your input if
- the background is static.
- </p></dd>
- <dt>‘<samp class="samp">single</samp>’</dt>
- <dd><p>Compute new histogram for each frame.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">full</var>.
- </p></dd>
- </dl>
- <p>The filter also exports the frame metadata <code class="code">lavfi.color_quant_ratio</code>
- (<code class="code">nb_color_in / nb_color_out</code>) which you can use to evaluate the degree of
- color quantization of the palette. This information is also visible at
- <var class="var">info</var> logging level.
- </p>
- <a name="Examples-149"></a>
- <h4 class="subsection">39.185.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-149" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-149" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate a representative palette of a given video using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv -vf palettegen palette.png
- </pre></div>
- </li></ul>
- <a name="paletteuse"></a>
- <h3 class="section">39.186 paletteuse<span class="pull-right"><a class="anchor hidden-xs" href="#paletteuse" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-paletteuse" aria-hidden="true">TOC</a></span></h3>
- <p>Use a palette to downsample an input video stream.
- </p>
- <p>The filter takes two inputs: one video stream and a palette. The palette must
- be a 256 pixels image.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dither</samp></dt>
- <dd><p>Select dithering mode. Available algorithms are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bayer</samp>’</dt>
- <dd><p>Ordered 8x8 bayer dithering (deterministic)
- </p></dd>
- <dt>‘<samp class="samp">heckbert</samp>’</dt>
- <dd><p>Dithering as defined by Paul Heckbert in 1982 (simple error diffusion).
- Note: this dithering is sometimes considered "wrong" and is included as a
- reference.
- </p></dd>
- <dt>‘<samp class="samp">floyd_steinberg</samp>’</dt>
- <dd><p>Floyd and Steingberg dithering (error diffusion)
- </p></dd>
- <dt>‘<samp class="samp">sierra2</samp>’</dt>
- <dd><p>Frankie Sierra dithering v2 (error diffusion)
- </p></dd>
- <dt>‘<samp class="samp">sierra2_4a</samp>’</dt>
- <dd><p>Frankie Sierra dithering v2 "Lite" (error diffusion)
- </p></dd>
- <dt>‘<samp class="samp">sierra3</samp>’</dt>
- <dd><p>Frankie Sierra dithering v3 (error diffusion)
- </p></dd>
- <dt>‘<samp class="samp">burkes</samp>’</dt>
- <dd><p>Burkes dithering (error diffusion)
- </p></dd>
- <dt>‘<samp class="samp">atkinson</samp>’</dt>
- <dd><p>Atkinson dithering by Bill Atkinson at Apple Computer (error diffusion)
- </p></dd>
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disable dithering.
- </p></dd>
- </dl>
- <p>Default is <var class="var">sierra2_4a</var>.
- </p>
- </dd>
- <dt><samp class="option">bayer_scale</samp></dt>
- <dd><p>When <var class="var">bayer</var> dithering is selected, this option defines the scale of the
- pattern (how much the crosshatch pattern is visible). A low value means more
- visible pattern for less banding, and higher value means less visible pattern
- at the cost of more banding.
- </p>
- <p>The option must be an integer value in the range [0,5]. Default is <var class="var">2</var>.
- </p>
- </dd>
- <dt><samp class="option">diff_mode</samp></dt>
- <dd><p>If set, define the zone to process
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">rectangle</samp>’</dt>
- <dd><p>Only the changing rectangle will be reprocessed. This is similar to GIF
- cropping/offsetting compression mechanism. This option can be useful for speed
- if only a part of the image is changing, and has use cases such as limiting the
- scope of the error diffusal <samp class="option">dither</samp> to the rectangle that bounds the
- moving scene (it leads to more deterministic output if the scene doesn’t change
- much, and as a result less moving noise and better GIF compression).
- </p></dd>
- </dl>
- <p>Default is <var class="var">none</var>.
- </p>
- </dd>
- <dt><samp class="option">new</samp></dt>
- <dd><p>Take new palette for each output frame.
- </p>
- </dd>
- <dt><samp class="option">alpha_threshold</samp></dt>
- <dd><p>Sets the alpha threshold for transparency. Alpha values above this threshold
- will be treated as completely opaque, and values below this threshold will be
- treated as completely transparent.
- </p>
- <p>The option must be an integer value in the range [0,255]. Default is <var class="var">128</var>.
- </p></dd>
- </dl>
- <a name="Examples-150"></a>
- <h4 class="subsection">39.186.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-150" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-150" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use a palette (generated for example with <a class="ref" href="#palettegen">palettegen</a>) to encode a GIF
- using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv -i palette.png -lavfi paletteuse output.gif
- </pre></div>
- </li></ul>
- <a name="perspective"></a>
- <h3 class="section">39.187 perspective<span class="pull-right"><a class="anchor hidden-xs" href="#perspective" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-perspective" aria-hidden="true">TOC</a></span></h3>
- <p>Correct perspective of video not recorded perpendicular to the screen.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">x0</samp></dt>
- <dt><samp class="option">y0</samp></dt>
- <dt><samp class="option">x1</samp></dt>
- <dt><samp class="option">y1</samp></dt>
- <dt><samp class="option">x2</samp></dt>
- <dt><samp class="option">y2</samp></dt>
- <dt><samp class="option">x3</samp></dt>
- <dt><samp class="option">y3</samp></dt>
- <dd><p>Set coordinates expression for top left, top right, bottom left and bottom right corners.
- Default values are <code class="code">0:0:W:0:0:H:W:H</code> with which perspective will remain unchanged.
- If the <code class="code">sense</code> option is set to <code class="code">source</code>, then the specified points will be sent
- to the corners of the destination. If the <code class="code">sense</code> option is set to <code class="code">destination</code>,
- then the corners of the source will be sent to the specified coordinates.
- </p>
- <p>The expressions can use the following variables:
- </p>
- <dl class="table">
- <dt><samp class="option">W</samp></dt>
- <dt><samp class="option">H</samp></dt>
- <dd><p>the width and height of video frame.
- </p></dd>
- <dt><samp class="option">in</samp></dt>
- <dd><p>Input frame count.
- </p></dd>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Output frame count.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">interpolation</samp></dt>
- <dd><p>Set interpolation for perspective correction.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dt>‘<samp class="samp">cubic</samp>’</dt>
- </dl>
- <p>Default value is ‘<samp class="samp">linear</samp>’.
- </p>
- </dd>
- <dt><samp class="option">sense</samp></dt>
- <dd><p>Set interpretation of coordinate options.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">0, source</samp>’</dt>
- <dd>
- <p>Send point in the source specified by the given coordinates to
- the corners of the destination.
- </p>
- </dd>
- <dt>‘<samp class="samp">1, destination</samp>’</dt>
- <dd>
- <p>Send the corners of the source to the point in the destination specified
- by the given coordinates.
- </p>
- <p>Default value is ‘<samp class="samp">source</samp>’.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set when the expressions for coordinates <samp class="option">x0,y0,...x3,y3</samp> are evaluated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>only evaluate expressions once during the filter initialization or
- when a command is processed
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>evaluate expressions for each incoming frame
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">init</samp>’.
- </p></dd>
- </dl>
- <a name="phase"></a>
- <h3 class="section">39.188 phase<span class="pull-right"><a class="anchor hidden-xs" href="#phase" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-phase" aria-hidden="true">TOC</a></span></h3>
- <p>Delay interlaced video by one field time so that the field order changes.
- </p>
- <p>The intended use is to fix PAL movies that have been captured with the
- opposite field order to the film-to-video transfer.
- </p>
- <p>A description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set phase mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">t</samp>’</dt>
- <dd><p>Capture field order top-first, transfer bottom-first.
- Filter will delay the bottom field.
- </p>
- </dd>
- <dt>‘<samp class="samp">b</samp>’</dt>
- <dd><p>Capture field order bottom-first, transfer top-first.
- Filter will delay the top field.
- </p>
- </dd>
- <dt>‘<samp class="samp">p</samp>’</dt>
- <dd><p>Capture and transfer with the same field order. This mode only exists
- for the documentation of the other options to refer to, but if you
- actually select it, the filter will faithfully do nothing.
- </p>
- </dd>
- <dt>‘<samp class="samp">a</samp>’</dt>
- <dd><p>Capture field order determined automatically by field flags, transfer
- opposite.
- Filter selects among ‘<samp class="samp">t</samp>’ and ‘<samp class="samp">b</samp>’ modes on a frame by frame
- basis using field flags. If no field information is available,
- then this works just like ‘<samp class="samp">u</samp>’.
- </p>
- </dd>
- <dt>‘<samp class="samp">u</samp>’</dt>
- <dd><p>Capture unknown or varying, transfer opposite.
- Filter selects among ‘<samp class="samp">t</samp>’ and ‘<samp class="samp">b</samp>’ on a frame by frame basis by
- analyzing the images and selecting the alternative that produces best
- match between the fields.
- </p>
- </dd>
- <dt>‘<samp class="samp">T</samp>’</dt>
- <dd><p>Capture top-first, transfer unknown or varying.
- Filter selects among ‘<samp class="samp">t</samp>’ and ‘<samp class="samp">p</samp>’ using image analysis.
- </p>
- </dd>
- <dt>‘<samp class="samp">B</samp>’</dt>
- <dd><p>Capture bottom-first, transfer unknown or varying.
- Filter selects among ‘<samp class="samp">b</samp>’ and ‘<samp class="samp">p</samp>’ using image analysis.
- </p>
- </dd>
- <dt>‘<samp class="samp">A</samp>’</dt>
- <dd><p>Capture determined by field flags, transfer unknown or varying.
- Filter selects among ‘<samp class="samp">t</samp>’, ‘<samp class="samp">b</samp>’ and ‘<samp class="samp">p</samp>’ using field flags and
- image analysis. If no field information is available, then this works just
- like ‘<samp class="samp">U</samp>’. This is the default mode.
- </p>
- </dd>
- <dt>‘<samp class="samp">U</samp>’</dt>
- <dd><p>Both capture and transfer unknown or varying.
- Filter selects among ‘<samp class="samp">t</samp>’, ‘<samp class="samp">b</samp>’ and ‘<samp class="samp">p</samp>’ using image analysis only.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Commands-129"></a>
- <h4 class="subsection">39.188.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-129" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-129" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="photosensitivity"></a>
- <h3 class="section">39.189 photosensitivity<span class="pull-right"><a class="anchor hidden-xs" href="#photosensitivity" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-photosensitivity" aria-hidden="true">TOC</a></span></h3>
- <p>Reduce various flashes in video, so to help users with epilepsy.
- </p>
- <p>It accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">frames, f</samp></dt>
- <dd><p>Set how many frames to use when filtering. Default is 30.
- </p>
- </dd>
- <dt><samp class="option">threshold, t</samp></dt>
- <dd><p>Set detection threshold factor. Default is 1.
- Lower is stricter.
- </p>
- </dd>
- <dt><samp class="option">skip</samp></dt>
- <dd><p>Set how many pixels to skip when sampling frames. Default is 1.
- Allowed range is from 1 to 1024.
- </p>
- </dd>
- <dt><samp class="option">bypass</samp></dt>
- <dd><p>Leave frames unchanged. Default is disabled.
- </p></dd>
- </dl>
- <a name="pixdesctest"></a>
- <h3 class="section">39.190 pixdesctest<span class="pull-right"><a class="anchor hidden-xs" href="#pixdesctest" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pixdesctest" aria-hidden="true">TOC</a></span></h3>
- <p>Pixel format descriptor test filter, mainly useful for internal
- testing. The output video should be equal to the input video.
- </p>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">format=monow, pixdesctest
- </pre></div>
- <p>can be used to test the monowhite pixel format descriptor definition.
- </p>
- <a name="pixelize"></a>
- <h3 class="section">39.191 pixelize<span class="pull-right"><a class="anchor hidden-xs" href="#pixelize" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pixelize" aria-hidden="true">TOC</a></span></h3>
- <p>Apply pixelization to video stream.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Set block dimensions that will be used for pixelization.
- Default value is <code class="code">16</code>.
- </p>
- </dd>
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set the mode of pixelization used.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">avg</samp>’</dt>
- <dt>‘<samp class="samp">min</samp>’</dt>
- <dt>‘<samp class="samp">max</samp>’</dt>
- </dl>
- <p>Default value is <code class="code">avg</code>.
- </p>
- </dd>
- <dt><samp class="option">planes, p</samp></dt>
- <dd><p>Set what planes to filter. Default is to filter all planes.
- </p></dd>
- </dl>
- <a name="Commands-130"></a>
- <h4 class="subsection">39.191.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-130" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-130" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports all options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="pixscope"></a>
- <h3 class="section">39.192 pixscope<span class="pull-right"><a class="anchor hidden-xs" href="#pixscope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pixscope" aria-hidden="true">TOC</a></span></h3>
- <p>Display sample values of color channels. Mainly useful for checking color
- and levels. Minimum supported resolution is 640x480.
- </p>
- <p>The filters accept the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set scope X position, relative offset on X axis.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set scope Y position, relative offset on Y axis.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dd><p>Set scope width.
- </p>
- </dd>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set scope height.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Set window opacity. This window also holds statistics about pixel area.
- </p>
- </dd>
- <dt><samp class="option">wx</samp></dt>
- <dd><p>Set window X position, relative offset on X axis.
- </p>
- </dd>
- <dt><samp class="option">wy</samp></dt>
- <dd><p>Set window Y position, relative offset on Y axis.
- </p></dd>
- </dl>
- <a name="Commands-131"></a>
- <h4 class="subsection">39.192.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-131" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-131" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="pp7"></a>
- <h3 class="section">39.193 pp7<span class="pull-right"><a class="anchor hidden-xs" href="#pp7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pp7" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Postprocessing filter 7. It is variant of the <a class="ref" href="#spp">spp</a> filter,
- similar to spp = 6 with 7 point DCT, where only the center sample is
- used after IDCT.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Force a constant quantization parameter. It accepts an integer in range
- 0 to 63. If not set, the filter will use the QP from the video stream
- (if available).
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set thresholding mode. Available modes are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">hard</samp>’</dt>
- <dd><p>Set hard thresholding.
- </p></dd>
- <dt>‘<samp class="samp">soft</samp>’</dt>
- <dd><p>Set soft thresholding (better de-ringing effect, but likely blurrier).
- </p></dd>
- <dt>‘<samp class="samp">medium</samp>’</dt>
- <dd><p>Set medium thresholding (good results, default).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="premultiply"></a>
- <h3 class="section">39.194 premultiply<span class="pull-right"><a class="anchor hidden-xs" href="#premultiply" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-premultiply" aria-hidden="true">TOC</a></span></h3>
- <p>Apply alpha premultiply effect to input video stream using first plane
- of second stream as alpha.
- </p>
- <p>Both streams must have same dimensions and same pixel format.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">inplace</samp></dt>
- <dd><p>Do not require 2nd input for processing, instead use alpha plane from input stream.
- </p></dd>
- </dl>
- <a name="premultiply_005fdynamic"></a>
- <h3 class="section">39.195 premultiply_dynamic<span class="pull-right"><a class="anchor hidden-xs" href="#premultiply_005fdynamic" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-premultiply_005fdynamic" aria-hidden="true">TOC</a></span></h3>
- <p>Dynamically premultiply or unpremultiply the input video stream as needed,
- to match the requirements of the downstream filter graph. This is roughly
- equivalent to either <code class="code">premultiply:inplace=yes</code> or
- <code class="code">unpremultiply:inplace=yes</code>, or otherwise a noop.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p></dd>
- </dl>
- <a name="prewitt"></a>
- <h3 class="section">39.196 prewitt<span class="pull-right"><a class="anchor hidden-xs" href="#prewitt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-prewitt" aria-hidden="true">TOC</a></span></h3>
- <p>Apply prewitt operator to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- </p></dd>
- </dl>
- <a name="Commands-132"></a>
- <h4 class="subsection">39.196.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-132" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-132" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="pseudocolor"></a>
- <h3 class="section">39.197 pseudocolor<span class="pull-right"><a class="anchor hidden-xs" href="#pseudocolor" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pseudocolor" aria-hidden="true">TOC</a></span></h3>
- <p>Alter frame colors in video with pseudocolors.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">c0</samp></dt>
- <dd><p>set pixel first component expression
- </p>
- </dd>
- <dt><samp class="option">c1</samp></dt>
- <dd><p>set pixel second component expression
- </p>
- </dd>
- <dt><samp class="option">c2</samp></dt>
- <dd><p>set pixel third component expression
- </p>
- </dd>
- <dt><samp class="option">c3</samp></dt>
- <dd><p>set pixel fourth component expression, corresponds to the alpha component
- </p>
- </dd>
- <dt><samp class="option">index, i</samp></dt>
- <dd><p>set component to use as base for altering colors
- </p>
- </dd>
- <dt><samp class="option">preset, p</samp></dt>
- <dd><p>Pick one of built-in LUTs. By default is set to none.
- </p>
- <p>Available LUTs:
- </p><dl class="table">
- <dt>‘<samp class="samp">magma</samp>’</dt>
- <dt>‘<samp class="samp">inferno</samp>’</dt>
- <dt>‘<samp class="samp">plasma</samp>’</dt>
- <dt>‘<samp class="samp">viridis</samp>’</dt>
- <dt>‘<samp class="samp">turbo</samp>’</dt>
- <dt>‘<samp class="samp">cividis</samp>’</dt>
- <dt>‘<samp class="samp">range1</samp>’</dt>
- <dt>‘<samp class="samp">range2</samp>’</dt>
- <dt>‘<samp class="samp">shadows</samp>’</dt>
- <dt>‘<samp class="samp">highlights</samp>’</dt>
- <dt>‘<samp class="samp">solar</samp>’</dt>
- <dt>‘<samp class="samp">nominal</samp>’</dt>
- <dt>‘<samp class="samp">preferred</samp>’</dt>
- <dt>‘<samp class="samp">total</samp>’</dt>
- <dt>‘<samp class="samp">spectral</samp>’</dt>
- <dt>‘<samp class="samp">cool</samp>’</dt>
- <dt>‘<samp class="samp">heat</samp>’</dt>
- <dt>‘<samp class="samp">fiery</samp>’</dt>
- <dt>‘<samp class="samp">blues</samp>’</dt>
- <dt>‘<samp class="samp">green</samp>’</dt>
- <dt>‘<samp class="samp">helix</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">opacity</samp></dt>
- <dd><p>Set opacity of output colors. Allowed range is from 0 to 1.
- Default value is set to 1.
- </p></dd>
- </dl>
- <p>Each of the expression options specifies the expression to use for computing
- the lookup table for the corresponding pixel component values.
- </p>
- <p>The expressions can contain the following constants and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">val</samp></dt>
- <dd><p>The input value for the pixel component.
- </p>
- </dd>
- <dt><samp class="option">ymin, umin, vmin, amin</samp></dt>
- <dd><p>The minimum allowed component value.
- </p>
- </dd>
- <dt><samp class="option">ymax, umax, vmax, amax</samp></dt>
- <dd><p>The maximum allowed component value.
- </p></dd>
- </dl>
- <p>All expressions default to "val".
- </p>
- <a name="Commands-133"></a>
- <h4 class="subsection">39.197.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-133" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-133" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-151"></a>
- <h4 class="subsection">39.197.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-151" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-151" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Change too high luma values to gradient:
- <div class="example">
- <pre class="example-preformatted">pseudocolor="'if(between(val,ymax,amax),lerp(ymin,ymax,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(umax,umin,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(vmin,vmax,(val-ymax)/(amax-ymax)),-1):-1'"
- </pre></div>
- </li></ul>
- <a class="anchor" id="psnr"></a><a name="psnr-1"></a>
- <h3 class="section">39.198 psnr<span class="pull-right"><a class="anchor hidden-xs" href="#psnr-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-psnr-1" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the average, maximum and minimum PSNR (Peak Signal to Noise
- Ratio) between two input videos.
- </p>
- <p>This filter takes in input two input videos, the first input is
- considered the "main" source and is passed unchanged to the
- output. The second input is used as a "reference" video for computing
- the PSNR.
- </p>
- <p>Both video inputs must have the same resolution and pixel format for
- this filter to work correctly. Also it assumes that both inputs
- have the same number of frames, which are compared one by one.
- </p>
- <p>The obtained average PSNR is printed through the logging system.
- </p>
- <p>The filter stores the accumulated MSE (mean squared error) of each
- frame, and at the end of the processing it is averaged across all frames
- equally, and the following formula is applied to obtain the PSNR:
- </p>
- <div class="example">
- <pre class="example-preformatted">PSNR = 10*log10(MAX^2/MSE)
- </pre></div>
- <p>Where MAX is the average of the maximum values of each component of the
- image.
- </p>
- <p>The description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">stats_file, f</samp></dt>
- <dd><p>If specified the filter will use the named file to save the PSNR of
- each individual frame. When filename equals "-" the data is sent to
- standard output.
- </p>
- </dd>
- <dt><samp class="option">stats_version</samp></dt>
- <dd><p>Specifies which version of the stats file format to use. Details of
- each format are written below.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">output_max</samp></dt>
- <dd><p>Determines whether the max value is output to the stats log.
- Default value is 0.
- Requires stats_version >= 2. If this is set and stats_version < 2,
- the filter will return an error.
- </p></dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>The file printed if <var class="var">stats_file</var> is selected, contains a sequence of
- key/value pairs of the form <var class="var">key</var>:<var class="var">value</var> for each compared
- couple of frames.
- </p>
- <p>If a <var class="var">stats_version</var> greater than 1 is specified, a header line precedes
- the list of per-frame-pair stats, with key value pairs following the frame
- format with the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">psnr_log_version</samp></dt>
- <dd><p>The version of the log file format. Will match <var class="var">stats_version</var>.
- </p>
- </dd>
- <dt><samp class="option">fields</samp></dt>
- <dd><p>A comma separated list of the per-frame-pair parameters included in
- the log.
- </p></dd>
- </dl>
- <p>A description of each shown per-frame-pair parameter follows:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>sequential number of the input frame, starting from 1
- </p>
- </dd>
- <dt><samp class="option">mse_avg</samp></dt>
- <dd><p>Mean Square Error pixel-by-pixel average difference of the compared
- frames, averaged over all the image components.
- </p>
- </dd>
- <dt><samp class="option">mse_y, mse_u, mse_v, mse_r, mse_g, mse_b, mse_a</samp></dt>
- <dd><p>Mean Square Error pixel-by-pixel average difference of the compared
- frames for the component specified by the suffix.
- </p>
- </dd>
- <dt><samp class="option">psnr_y, psnr_u, psnr_v, psnr_r, psnr_g, psnr_b, psnr_a</samp></dt>
- <dd><p>Peak Signal to Noise ratio of the compared frames for the component
- specified by the suffix.
- </p>
- </dd>
- <dt><samp class="option">max_avg, max_y, max_u, max_v</samp></dt>
- <dd><p>Maximum allowed value for each channel, and average over all
- channels.
- </p></dd>
- </dl>
- <a name="Examples-152"></a>
- <h4 class="subsection">39.198.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-152" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-152" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>For example:
- <div class="example">
- <pre class="example-preformatted">movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
- [main][ref] psnr="stats_file=stats.log" [out]
- </pre></div>
- <p>On this example the input file being processed is compared with the
- reference file <samp class="file">ref_movie.mpg</samp>. The PSNR of each individual frame
- is stored in <samp class="file">stats.log</samp>.
- </p>
- </li><li>Another example with different containers:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]psnr" -f null -
- </pre></div>
- </li></ul>
- <a class="anchor" id="pullup"></a><a name="pullup-1"></a>
- <h3 class="section">39.199 pullup<span class="pull-right"><a class="anchor hidden-xs" href="#pullup-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pullup-1" aria-hidden="true">TOC</a></span></h3>
- <p>Pulldown reversal (inverse telecine) filter, capable of handling mixed
- hard-telecine, 24000/1001 fps progressive, and 30000/1001 fps progressive
- content.
- </p>
- <p>The pullup filter is designed to take advantage of future context in making
- its decisions. This filter is stateless in the sense that it does not lock
- onto a pattern to follow, but it instead looks forward to the following
- fields in order to identify matches and rebuild progressive frames.
- </p>
- <p>To produce content with an even framerate, insert the fps filter after
- pullup, use <code class="code">fps=24000/1001</code> if the input frame rate is 29.97fps,
- <code class="code">fps=24</code> for 30fps and the (rare) telecined 25fps input.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">jl</samp></dt>
- <dt><samp class="option">jr</samp></dt>
- <dt><samp class="option">jt</samp></dt>
- <dt><samp class="option">jb</samp></dt>
- <dd><p>These options set the amount of "junk" to ignore at the left, right, top, and
- bottom of the image, respectively. Left and right are in units of 8 pixels,
- while top and bottom are in units of 2 lines.
- The default is 8 pixels on each side.
- </p>
- </dd>
- <dt><samp class="option">sb</samp></dt>
- <dd><p>Set the strict breaks. Setting this option to 1 will reduce the chances of
- filter generating an occasional mismatched frame, but it may also cause an
- excessive number of frames to be dropped during high motion sequences.
- Conversely, setting it to -1 will make filter match fields more easily.
- This may help processing of video where there is slight blurring between
- the fields, but may also cause there to be interlaced frames in the output.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">mp</samp></dt>
- <dd><p>Set the metric plane to use. It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">l</samp>’</dt>
- <dd><p>Use luma plane.
- </p>
- </dd>
- <dt>‘<samp class="samp">u</samp>’</dt>
- <dd><p>Use chroma blue plane.
- </p>
- </dd>
- <dt>‘<samp class="samp">v</samp>’</dt>
- <dd><p>Use chroma red plane.
- </p></dd>
- </dl>
- <p>This option may be set to use chroma plane instead of the default luma plane
- for doing filter’s computations. This may improve accuracy on very clean
- source material, but more likely will decrease accuracy, especially if there
- is chroma noise (rainbow effect) or any grayscale video.
- The main purpose of setting <samp class="option">mp</samp> to a chroma plane is to reduce CPU
- load and make pullup usable in realtime on slow machines.
- </p></dd>
- </dl>
- <p>For best results (without duplicated frames in the output file) it is
- necessary to change the output frame rate. For example, to inverse
- telecine NTSC input:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i input -vf pullup -r 24000/1001 ...
- </pre></div>
- <a name="qp"></a>
- <h3 class="section">39.200 qp<span class="pull-right"><a class="anchor hidden-xs" href="#qp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-qp" aria-hidden="true">TOC</a></span></h3>
- <p>Change video quantization parameters (QP).
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Set expression for quantization parameter.
- </p></dd>
- </dl>
- <p>The expression is evaluated through the eval API and can contain, among others,
- the following constants:
- </p>
- <dl class="table">
- <dt><var class="var">known</var></dt>
- <dd><p>1 if index is not 129, 0 otherwise.
- </p>
- </dd>
- <dt><var class="var">qp</var></dt>
- <dd><p>Sequential index starting from -129 to 128.
- </p></dd>
- </dl>
- <a name="Examples-153"></a>
- <h4 class="subsection">39.200.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-153" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-153" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Some equation like:
- <div class="example">
- <pre class="example-preformatted">qp=2+2*sin(PI*qp)
- </pre></div>
- </li></ul>
- <a name="qrencode"></a>
- <h3 class="section">39.201 qrencode<span class="pull-right"><a class="anchor hidden-xs" href="#qrencode" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-qrencode" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a QR code using the libqrencode library (see
- <a class="url" href="https://fukuchi.org/works/qrencode/">https://fukuchi.org/works/qrencode/</a>), and overlay it on top of the current
- frame.
- </p>
- <p>To enable the compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-libqrencode</code>.
- </p>
- <p>The QR code is generated from the provided text or text pattern. The
- corresponding QR code is scaled and overlaid into the video output according to
- the specified options.
- </p>
- <p>In case no text is specified, no QR code is overlaied.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">qrcode_width, q</samp></dt>
- <dt><samp class="option">padded_qrcode_width, Q</samp></dt>
- <dd><p>Specify an expression for the width of the rendered QR code, with and without
- padding. The <var class="var">qrcode_width</var> expression can reference the value set by the
- <var class="var">padded_qrcode_width</var> expression, and vice versa.
- By default <var class="var">padded_qrcode_width</var> is set to <var class="var">qrcode_width</var>, meaning that
- there is no padding.
- </p>
- <p>These expressions are evaluated for each new frame.
- </p>
- <p>See the <a class="ref" href="#qrencode_005fexpressions">qrencode Expressions</a> section for details.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Specify an expression for positioning the padded QR code top-left corner. The
- <var class="var">x</var> expression can reference the value set by the <var class="var">y</var> expression, and
- vice.
- </p>
- <p>By default <var class="var">x</var> and <var class="var">y</var> are set set to <var class="var">0</var>, meaning that the QR code
- is placed in the top left corner of the input.
- </p>
- <p>These expressions are evaluated for each new frame.
- </p>
- <p>See the <a class="ref" href="#qrencode_005fexpressions">qrencode Expressions</a> section for details.
- </p>
- </dd>
- <dt><samp class="option">case_sensitive, cs</samp></dt>
- <dd><p>Instruct libqrencode to use case sensitive encoding. This is enabled by
- default. This can be disabled to reduce the QR encoding size.
- </p>
- </dd>
- <dt><samp class="option">level, l</samp></dt>
- <dd><p>Specify the QR encoding error correction level. With an higher correction level,
- the encoding size will increase but the code will be more robust to corruption.
- Lower level is <var class="var">L</var>.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">L</samp>’</dt>
- <dt>‘<samp class="samp">M</samp>’</dt>
- <dt>‘<samp class="samp">Q</samp>’</dt>
- <dt>‘<samp class="samp">H</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">expansion</samp></dt>
- <dd><p>Select how the input text is expanded. Can be either <code class="code">none</code>, or
- <code class="code">normal</code> (default). See the <a class="ref" href="#qrencode_005ftext_005fexpansion">qrencode Text expansion</a>
- section below for details.
- </p>
- </dd>
- <dt><samp class="option">text</samp></dt>
- <dt><samp class="option">textfile</samp></dt>
- <dd><p>Define the text to be rendered. In case neither is specified, no QR is encoded
- (just an empty colored frame).
- </p>
- <p>In case expansion is enabled, the text is treated as a text template, using the
- qrencode expansion mechanism. See the <a class="ref" href="#qrencode_005ftext_005fexpansion">qrencode
- Text expansion</a> section below for details.
- </p>
- </dd>
- <dt><samp class="option">background_color, bc</samp></dt>
- <dt><samp class="option">foreground_color, fc</samp></dt>
- <dd><p>Set the QR code and background color. The default value of
- <var class="var">foreground_color</var> is "black", the default value of <var class="var">background_color</var>
- is "white".
- </p>
- <p>For the syntax of the color options, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color"
- section in the ffmpeg-utils manual</a>.
- </p></dd>
- </dl>
- <a class="anchor" id="qrencode_005fexpressions"></a><a name="qrencode-Expressions"></a>
- <h4 class="subsection">39.201.1 qrencode Expressions<span class="pull-right"><a class="anchor hidden-xs" href="#qrencode-Expressions" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-qrencode-Expressions" aria-hidden="true">TOC</a></span></h4>
- <p>The expressions set by the options contain the following constants and functions.
- </p>
- <dl class="table">
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">w</var> / <var class="var">h</var>) * <var class="var">sar</var>
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>the current frame’s duration, in seconds
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">main_h, H</samp></dt>
- <dd><p>the input height
- </p>
- </dd>
- <dt><samp class="option">main_w, W</samp></dt>
- <dd><p>the input width
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>the number of input frame, starting from 0
- </p>
- </dd>
- <dt><samp class="option">pict_type</samp></dt>
- <dd><p>a number representing the picture type
- </p>
- </dd>
- <dt><samp class="option">qr_w, w</samp></dt>
- <dd><p>the width of the encoded QR code
- </p>
- </dd>
- <dt><samp class="option">rendered_qr_w, q</samp></dt>
- <dt><samp class="option">rendered_padded_qr_w, Q</samp></dt>
- <dd><p>the width of the rendered QR code, without and without padding.
- </p>
- <p>These parameters allow the <var class="var">q</var> and <var class="var">Q</var> expressions to refer to each
- other, so you can for example specify <code class="code">q=3/4*Q</code>.
- </p>
- </dd>
- <dt><samp class="option">rand(min, max)</samp></dt>
- <dd><p>return a random number included between <var class="var">min</var> and <var class="var">max</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>the input sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>timestamp expressed in seconds, NAN if the input timestamp is unknown
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>the x and y offset coordinates where the text is drawn.
- </p>
- <p>These parameters allow the <var class="var">x</var> and <var class="var">y</var> expressions to refer to each
- other, so you can for example specify <code class="code">y=x/dar</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="qrencode_005ftext_005fexpansion"></a><a name="qrencode-Text-expansion"></a>
- <h4 class="subsection">39.201.2 qrencode Text expansion<span class="pull-right"><a class="anchor hidden-xs" href="#qrencode-Text-expansion" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-qrencode-Text-expansion" aria-hidden="true">TOC</a></span></h4>
- <p>If <samp class="option">expansion</samp> is set to <code class="code">none</code>, the text is printed verbatim.
- </p>
- <p>If <samp class="option">expansion</samp> is set to <code class="code">normal</code> (which is the default),
- the following expansion mechanism is used.
- </p>
- <p>The backslash character ‘<samp class="samp">\</samp>’, followed by any character, always expands to
- the second character.
- </p>
- <p>Sequences of the form <code class="code">%{...}</code> are expanded. The text between the
- braces is a function name, possibly followed by arguments separated by ’:’.
- If the arguments contain special characters or delimiters (’:’ or ’}’),
- they should be escaped.
- </p>
- <p>Note that they probably must also be escaped as the value for the <samp class="option">text</samp>
- option in the filter argument string and as the filter argument in the
- filtergraph description, and possibly also for the shell, that makes up to four
- levels of escaping; using a text file with the <samp class="option">textfile</samp> option avoids
- these problems.
- </p>
- <p>The following functions are available:
- </p>
- <dl class="table">
- <dt><code class="command">n, frame_num</code></dt>
- <dd><p>return the frame number
- </p>
- </dd>
- <dt><code class="command">pts</code></dt>
- <dd><p>Return the presentation timestamp of the current frame.
- </p>
- <p>It can take up to two arguments.
- </p>
- <p>The first argument is the format of the timestamp; it defaults to <code class="code">flt</code> for
- seconds as a decimal number with microsecond accuracy; <code class="code">hms</code> stands for a
- formatted <var class="var">[-]HH:MM:SS.mmm</var> timestamp with millisecond accuracy.
- <code class="code">gmtime</code> stands for the timestamp of the frame formatted as UTC time;
- <code class="code">localtime</code> stands for the timestamp of the frame formatted as local time
- zone time. If the format is set to <code class="code">hms24hh</code>, the time is formatted in 24h
- format (00-23).
- </p>
- <p>The second argument is an offset added to the timestamp.
- </p>
- <p>If the format is set to <code class="code">localtime</code> or <code class="code">gmtime</code>, a third argument may
- be supplied: a <code class="code">strftime</code> C function format string. By default,
- <var class="var">YYYY-MM-DD HH:MM:SS</var> format will be used.
- </p>
- </dd>
- <dt><code class="command">expr, e</code></dt>
- <dd><p>Evaluate the expression’s value and output as a double.
- </p>
- <p>It must take one argument specifying the expression to be evaluated, accepting
- the constants and functions defined in <a class="ref" href="#qrencode_005fexpressions">qrencode_expressions</a>.
- </p>
- </dd>
- <dt><code class="command">expr_formatted, ef</code></dt>
- <dd><p>Evaluate the expression’s value and output as a formatted string.
- </p>
- <p>The first argument is the expression to be evaluated, just as for the <var class="var">expr</var> function.
- The second argument specifies the output format. Allowed values are ‘<samp class="samp">x</samp>’,
- ‘<samp class="samp">X</samp>’, ‘<samp class="samp">d</samp>’ and ‘<samp class="samp">u</samp>’. They are treated exactly as in the
- <code class="code">printf</code> function.
- The third parameter is optional and sets the number of positions taken by the output.
- It can be used to add padding with zeros from the left.
- </p>
- </dd>
- <dt><code class="command">gmtime</code></dt>
- <dd><p>The time at which the filter is running, expressed in UTC.
- It can accept an argument: a <code class="code">strftime</code> C function format string.
- The format string is extended to support the variable <var class="var">%[1-6]N</var>
- which prints fractions of the second with optionally specified number of digits.
- </p>
- </dd>
- <dt><code class="command">localtime</code></dt>
- <dd><p>The time at which the filter is running, expressed in the local time zone.
- It can accept an argument: a <code class="code">strftime</code> C function format string.
- The format string is extended to support the variable <var class="var">%[1-6]N</var>
- which prints fractions of the second with optionally specified number of digits.
- </p>
- </dd>
- <dt><code class="command">metadata</code></dt>
- <dd><p>Frame metadata. Takes one or two arguments.
- </p>
- <p>The first argument is mandatory and specifies the metadata key.
- </p>
- <p>The second argument is optional and specifies a default value, used when the
- metadata key is not found or empty.
- </p>
- <p>Available metadata can be identified by inspecting entries starting with TAG
- included within each frame section printed by running <code class="code">ffprobe
- -show_frames</code>.
- </p>
- <p>String metadata generated in filters leading to the qrencode filter are also
- available.
- </p>
- </dd>
- <dt><code class="command">rand(min, max)</code></dt>
- <dd><p>return a random number included between <var class="var">min</var> and <var class="var">max</var>
- </p></dd>
- </dl>
- <a name="Examples-154"></a>
- <h4 class="subsection">39.201.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-154" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-154" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate a QR code encoding the specified text with the default size, overalaid
- in the top left corner of the input video, with the default size:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=www.ffmpeg.org
- </pre></div>
- </li><li>Same as below, but select blue on pink colors:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=www.ffmpeg.org:bc=pink@0.5:fc=blue
- </pre></div>
- </li><li>Place the QR code in the bottom right corner of the input video:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=www.ffmpeg.org:x=W-Q:y=H-Q
- </pre></div>
- </li><li>Generate a QR code with width of 200 pixels and padding, making the padded width
- 4/3 of the QR code width:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=www.ffmpeg.org:q=200:Q=4/3*q
- </pre></div>
- </li><li>Generate a QR code with padded width of 200 pixels and padding, making the QR
- code width 3/4 of the padded width:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=www.ffmpeg.org:Q=200:q=3/4*Q
- </pre></div>
- </li><li>Make the QR code a fraction of the input video width:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=www.ffmpeg.org:q=W/5
- </pre></div>
- </li><li>Generate a QR code encoding the frame number:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=%{n}
- </pre></div>
- </li><li>Generate a QR code encoding the GMT timestamp:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=%{gmtime}
- </pre></div>
- </li><li>Generate a QR code encoding the timestamp expressed as a float:
- <div class="example">
- <pre class="example-preformatted">qrencode=text=%{pts}
- </pre></div>
- </li></ul>
- <a name="quirc"></a>
- <h3 class="section">39.202 quirc<span class="pull-right"><a class="anchor hidden-xs" href="#quirc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-quirc" aria-hidden="true">TOC</a></span></h3>
- <p>Identify and decode a QR code using the libquirc library (see
- <a class="url" href="https://github.com/dlbeer/quirc/">https://github.com/dlbeer/quirc/</a>), and print the identified QR codes
- positions and payload as metadata.
- </p>
- <p>To enable the compilation of this filter, you need to configure FFmpeg with
- <code class="code">--enable-libquirc</code>.
- </p>
- <p>For each found QR code in the input video, some metadata entries are added with
- the prefix <var class="var">lavfi.quirc.N</var>, where <var class="var">N</var> is the index, starting from 0,
- associated to the QR code.
- </p>
- <p>A description of each metadata value follows:
- </p>
- <dl class="table">
- <dt><samp class="option">lavfi.quirc.count</samp></dt>
- <dd><p>the number of found QR codes, it is not set in case none was found
- </p>
- </dd>
- <dt><samp class="option">lavfi.quirc.N.corner.M.x</samp></dt>
- <dt><samp class="option">lavfi.quirc.N.coreer.M.y</samp></dt>
- <dd><p>the x/y positions of the four corners of the square containing the QR code,
- where <var class="var">M</var> is the index of the corner starting from 0
- </p>
- </dd>
- <dt><samp class="option">lavfi.quirc.N.payload</samp></dt>
- <dd><p>the payload of the QR code
- </p></dd>
- </dl>
- <a name="random"></a>
- <h3 class="section">39.203 random<span class="pull-right"><a class="anchor hidden-xs" href="#random" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-random" aria-hidden="true">TOC</a></span></h3>
- <p>Flush video frames from internal cache of frames into a random order.
- No frame is discarded.
- Inspired by <a class="ref" href="#frei0r">frei0r</a> nervous filter.
- </p>
- <dl class="table">
- <dt><samp class="option">frames</samp></dt>
- <dd><p>Set size in number of frames of internal cache, in range from <code class="code">2</code> to
- <code class="code">512</code>. Default is <code class="code">30</code>.
- </p>
- </dd>
- <dt><samp class="option">seed</samp></dt>
- <dd><p>Set seed for random number generator, must be an integer included between
- <code class="code">0</code> and <code class="code">UINT32_MAX</code>. If not specified, or if explicitly set to
- less than <code class="code">0</code>, the filter will try to use a good random seed on a
- best effort basis.
- </p></dd>
- </dl>
- <a name="readeia608"></a>
- <h3 class="section">39.204 readeia608<span class="pull-right"><a class="anchor hidden-xs" href="#readeia608" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-readeia608" aria-hidden="true">TOC</a></span></h3>
- <p>Read closed captioning (EIA-608) information from the top lines of a video frame.
- </p>
- <p>This filter adds frame metadata for <code class="code">lavfi.readeia608.X.cc</code> and
- <code class="code">lavfi.readeia608.X.line</code>, where <code class="code">X</code> is the number of the identified line
- with EIA-608 data (starting from 0). A description of each metadata value follows:
- </p>
- <dl class="table">
- <dt><samp class="option">lavfi.readeia608.X.cc</samp></dt>
- <dd><p>The two bytes stored as EIA-608 data (printed in hexadecimal).
- </p>
- </dd>
- <dt><samp class="option">lavfi.readeia608.X.line</samp></dt>
- <dd><p>The number of the line on which the EIA-608 data was identified and read.
- </p></dd>
- </dl>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">scan_min</samp></dt>
- <dd><p>Set the line to start scanning for EIA-608 data. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">scan_max</samp></dt>
- <dd><p>Set the line to end scanning for EIA-608 data. Default is <code class="code">29</code>.
- </p>
- </dd>
- <dt><samp class="option">spw</samp></dt>
- <dd><p>Set the ratio of width reserved for sync code detection.
- Default is <code class="code">0.27</code>. Allowed range is <code class="code">[0.1 - 0.7]</code>.
- </p>
- </dd>
- <dt><samp class="option">chp</samp></dt>
- <dd><p>Enable checking the parity bit. In the event of a parity error, the filter will output
- <code class="code">0x00</code> for that character. Default is false.
- </p>
- </dd>
- <dt><samp class="option">lp</samp></dt>
- <dd><p>Lowpass lines prior to further processing. Default is enabled.
- </p></dd>
- </dl>
- <a name="Commands-134"></a>
- <h4 class="subsection">39.204.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-134" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-134" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-155"></a>
- <h4 class="subsection">39.204.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-155" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-155" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Output a csv with presentation time and the first two lines of identified EIA-608 captioning data.
- <div class="example">
- <pre class="example-preformatted">ffprobe -f lavfi -i movie=captioned_video.mov,readeia608 -show_entries frame=pts_time:frame_tags=lavfi.readeia608.0.cc,lavfi.readeia608.1.cc -of csv
- </pre></div>
- </li></ul>
- <a name="readvitc"></a>
- <h3 class="section">39.205 readvitc<span class="pull-right"><a class="anchor hidden-xs" href="#readvitc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-readvitc" aria-hidden="true">TOC</a></span></h3>
- <p>Read vertical interval timecode (VITC) information from the top lines of a
- video frame.
- </p>
- <p>The filter adds frame metadata key <code class="code">lavfi.readvitc.tc_str</code> with the
- timecode value, if a valid timecode has been detected. Further metadata key
- <code class="code">lavfi.readvitc.found</code> is set to 0/1 depending on whether
- timecode data has been found or not.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">scan_max</samp></dt>
- <dd><p>Set the maximum number of lines to scan for VITC data. If the value is set to
- <code class="code">-1</code> the full video frame is scanned. Default is <code class="code">45</code>.
- </p>
- </dd>
- <dt><samp class="option">thr_b</samp></dt>
- <dd><p>Set the luma threshold for black. Accepts float numbers in the range [0.0,1.0],
- default value is <code class="code">0.2</code>. The value must be equal or less than <code class="code">thr_w</code>.
- </p>
- </dd>
- <dt><samp class="option">thr_w</samp></dt>
- <dd><p>Set the luma threshold for white. Accepts float numbers in the range [0.0,1.0],
- default value is <code class="code">0.6</code>. The value must be equal or greater than <code class="code">thr_b</code>.
- </p></dd>
- </dl>
- <a name="Examples-156"></a>
- <h4 class="subsection">39.205.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-156" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-156" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Detect and draw VITC data onto the video frame; if no valid VITC is detected,
- draw <code class="code">--:--:--:--</code> as a placeholder:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.avi -filter:v 'readvitc,drawtext=fontfile=FreeMono.ttf:text=%{metadata\\:lavfi.readvitc.tc_str\\:--\\\\\\:--\\\\\\:--\\\\\\:--}:x=(w-tw)/2:y=400-ascent'
- </pre></div>
- </li></ul>
- <a name="remap"></a>
- <h3 class="section">39.206 remap<span class="pull-right"><a class="anchor hidden-xs" href="#remap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-remap" aria-hidden="true">TOC</a></span></h3>
- <p>Remap pixels using 2nd: Xmap and 3rd: Ymap input video stream.
- </p>
- <p>Destination pixel at position (X, Y) will be picked from source (x, y) position
- where x = Xmap(X, Y) and y = Ymap(X, Y). If mapping values are out of range, zero
- value for pixel will be used for destination pixel.
- </p>
- <p>Xmap and Ymap input video streams must be of same dimensions. Output video stream
- will have Xmap/Ymap video stream dimensions.
- Xmap and Ymap input video streams are 16bit depth, single channel.
- </p>
- <dl class="table">
- <dt><samp class="option">format</samp></dt>
- <dd><p>Specify pixel format of output from this filter. Can be <code class="code">color</code> or <code class="code">gray</code>.
- Default is <code class="code">color</code>.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>Specify the color of the unmapped pixels. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>. Default color is <code class="code">black</code>.
- </p></dd>
- </dl>
- <a name="removegrain"></a>
- <h3 class="section">39.207 removegrain<span class="pull-right"><a class="anchor hidden-xs" href="#removegrain" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-removegrain" aria-hidden="true">TOC</a></span></h3>
- <p>The removegrain filter is a spatial denoiser for progressive video.
- </p>
- <dl class="table">
- <dt><samp class="option">m0</samp></dt>
- <dd><p>Set mode for the first plane.
- </p>
- </dd>
- <dt><samp class="option">m1</samp></dt>
- <dd><p>Set mode for the second plane.
- </p>
- </dd>
- <dt><samp class="option">m2</samp></dt>
- <dd><p>Set mode for the third plane.
- </p>
- </dd>
- <dt><samp class="option">m3</samp></dt>
- <dd><p>Set mode for the fourth plane.
- </p></dd>
- </dl>
- <p>Range of mode is from 0 to 24. Description of each mode follows:
- </p>
- <dl class="table">
- <dt><var class="var">0</var></dt>
- <dd><p>Leave input plane unchanged. Default.
- </p>
- </dd>
- <dt><var class="var">1</var></dt>
- <dd><p>Clips the pixel with the minimum and maximum of the 8 neighbour pixels.
- </p>
- </dd>
- <dt><var class="var">2</var></dt>
- <dd><p>Clips the pixel with the second minimum and maximum of the 8 neighbour pixels.
- </p>
- </dd>
- <dt><var class="var">3</var></dt>
- <dd><p>Clips the pixel with the third minimum and maximum of the 8 neighbour pixels.
- </p>
- </dd>
- <dt><var class="var">4</var></dt>
- <dd><p>Clips the pixel with the fourth minimum and maximum of the 8 neighbour pixels.
- This is equivalent to a median filter.
- </p>
- </dd>
- <dt><var class="var">5</var></dt>
- <dd><p>Line-sensitive clipping giving the minimal change.
- </p>
- </dd>
- <dt><var class="var">6</var></dt>
- <dd><p>Line-sensitive clipping, intermediate.
- </p>
- </dd>
- <dt><var class="var">7</var></dt>
- <dd><p>Line-sensitive clipping, intermediate.
- </p>
- </dd>
- <dt><var class="var">8</var></dt>
- <dd><p>Line-sensitive clipping, intermediate.
- </p>
- </dd>
- <dt><var class="var">9</var></dt>
- <dd><p>Line-sensitive clipping on a line where the neighbours pixels are the closest.
- </p>
- </dd>
- <dt><var class="var">10</var></dt>
- <dd><p>Replaces the target pixel with the closest neighbour.
- </p>
- </dd>
- <dt><var class="var">11</var></dt>
- <dd><p>[1 2 1] horizontal and vertical kernel blur.
- </p>
- </dd>
- <dt><var class="var">12</var></dt>
- <dd><p>Same as mode 11.
- </p>
- </dd>
- <dt><var class="var">13</var></dt>
- <dd><p>Bob mode, interpolates top field from the line where the neighbours
- pixels are the closest.
- </p>
- </dd>
- <dt><var class="var">14</var></dt>
- <dd><p>Bob mode, interpolates bottom field from the line where the neighbours
- pixels are the closest.
- </p>
- </dd>
- <dt><var class="var">15</var></dt>
- <dd><p>Bob mode, interpolates top field. Same as 13 but with a more complicated
- interpolation formula.
- </p>
- </dd>
- <dt><var class="var">16</var></dt>
- <dd><p>Bob mode, interpolates bottom field. Same as 14 but with a more complicated
- interpolation formula.
- </p>
- </dd>
- <dt><var class="var">17</var></dt>
- <dd><p>Clips the pixel with the minimum and maximum of respectively the maximum and
- minimum of each pair of opposite neighbour pixels.
- </p>
- </dd>
- <dt><var class="var">18</var></dt>
- <dd><p>Line-sensitive clipping using opposite neighbours whose greatest distance from
- the current pixel is minimal.
- </p>
- </dd>
- <dt><var class="var">19</var></dt>
- <dd><p>Replaces the pixel with the average of its 8 neighbours.
- </p>
- </dd>
- <dt><var class="var">20</var></dt>
- <dd><p>Averages the 9 pixels ([1 1 1] horizontal and vertical blur).
- </p>
- </dd>
- <dt><var class="var">21</var></dt>
- <dd><p>Clips pixels using the averages of opposite neighbour.
- </p>
- </dd>
- <dt><var class="var">22</var></dt>
- <dd><p>Same as mode 21 but simpler and faster.
- </p>
- </dd>
- <dt><var class="var">23</var></dt>
- <dd><p>Small edge and halo removal, but reputed useless.
- </p>
- </dd>
- <dt><var class="var">24</var></dt>
- <dd><p>Similar as 23.
- </p></dd>
- </dl>
- <a name="removelogo"></a>
- <h3 class="section">39.208 removelogo<span class="pull-right"><a class="anchor hidden-xs" href="#removelogo" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-removelogo" aria-hidden="true">TOC</a></span></h3>
- <p>Suppress a TV station logo, using an image file to determine which
- pixels comprise the logo. It works by filling in the pixels that
- comprise the logo with neighboring pixels.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">filename, f</samp></dt>
- <dd><p>Set the filter bitmap file, which can be any image format supported by
- libavformat. The width and height of the image file must match those of the
- video stream being processed.
- </p></dd>
- </dl>
- <p>Pixels in the provided bitmap image with a value of zero are not
- considered part of the logo, non-zero pixels are considered part of
- the logo. If you use white (255) for the logo and black (0) for the
- rest, you will be safe. For making the filter bitmap, it is
- recommended to take a screen capture of a black frame with the logo
- visible, and then using a threshold filter followed by the erode
- filter once or twice.
- </p>
- <p>If needed, little splotches can be fixed manually. Remember that if
- logo pixels are not covered, the filter quality will be much
- reduced. Marking too many pixels as part of the logo does not hurt as
- much, but it will increase the amount of blurring needed to cover over
- the image and will destroy more information than necessary, and extra
- pixels will slow things down on a large logo.
- </p>
- <a name="repeatfields"></a>
- <h3 class="section">39.209 repeatfields<span class="pull-right"><a class="anchor hidden-xs" href="#repeatfields" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-repeatfields" aria-hidden="true">TOC</a></span></h3>
- <p>This filter uses the repeat_field flag from the Video ES headers and hard repeats
- fields based on its value.
- </p>
- <a name="reverse"></a>
- <h3 class="section">39.210 reverse<span class="pull-right"><a class="anchor hidden-xs" href="#reverse" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-reverse" aria-hidden="true">TOC</a></span></h3>
- <p>Reverse a video clip.
- </p>
- <p>Warning: This filter requires memory to buffer the entire clip, so trimming
- is suggested.
- </p>
- <a name="Examples-157"></a>
- <h4 class="subsection">39.210.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-157" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-157" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Take the first 5 seconds of a clip, and reverse it.
- <div class="example">
- <pre class="example-preformatted">trim=end=5,reverse
- </pre></div>
- </li></ul>
- <a name="rgbashift"></a>
- <h3 class="section">39.211 rgbashift<span class="pull-right"><a class="anchor hidden-xs" href="#rgbashift" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rgbashift" aria-hidden="true">TOC</a></span></h3>
- <p>Shift R/G/B/A pixels horizontally and/or vertically.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">rh</samp></dt>
- <dd><p>Set amount to shift red horizontally.
- </p></dd>
- <dt><samp class="option">rv</samp></dt>
- <dd><p>Set amount to shift red vertically.
- </p></dd>
- <dt><samp class="option">gh</samp></dt>
- <dd><p>Set amount to shift green horizontally.
- </p></dd>
- <dt><samp class="option">gv</samp></dt>
- <dd><p>Set amount to shift green vertically.
- </p></dd>
- <dt><samp class="option">bh</samp></dt>
- <dd><p>Set amount to shift blue horizontally.
- </p></dd>
- <dt><samp class="option">bv</samp></dt>
- <dd><p>Set amount to shift blue vertically.
- </p></dd>
- <dt><samp class="option">ah</samp></dt>
- <dd><p>Set amount to shift alpha horizontally.
- </p></dd>
- <dt><samp class="option">av</samp></dt>
- <dd><p>Set amount to shift alpha vertically.
- </p></dd>
- <dt><samp class="option">edge</samp></dt>
- <dd><p>Set edge mode, can be <var class="var">smear</var>, default, or <var class="var">warp</var>.
- </p></dd>
- </dl>
- <a name="Commands-135"></a>
- <h4 class="subsection">39.211.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-135" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-135" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="roberts"></a>
- <h3 class="section">39.212 roberts<span class="pull-right"><a class="anchor hidden-xs" href="#roberts" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-roberts" aria-hidden="true">TOC</a></span></h3>
- <p>Apply roberts cross operator to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- </p></dd>
- </dl>
- <a name="Commands-136"></a>
- <h4 class="subsection">39.212.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-136" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-136" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="rotate"></a>
- <h3 class="section">39.213 rotate<span class="pull-right"><a class="anchor hidden-xs" href="#rotate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rotate" aria-hidden="true">TOC</a></span></h3>
- <p>Rotate video by an arbitrary angle expressed in radians.
- </p>
- <p>The filter accepts the following options:
- </p>
- <p>A description of the optional parameters follows.
- </p><dl class="table">
- <dt><samp class="option">angle, a</samp></dt>
- <dd><p>Set an expression for the angle by which to rotate the input video
- clockwise, expressed as a number of radians. A negative value will
- result in a counter-clockwise rotation. By default it is set to "0".
- </p>
- <p>This expression is evaluated for each frame.
- </p>
- </dd>
- <dt><samp class="option">out_w, ow</samp></dt>
- <dd><p>Set the output width expression, default value is "iw".
- This expression is evaluated just once during configuration.
- </p>
- </dd>
- <dt><samp class="option">out_h, oh</samp></dt>
- <dd><p>Set the output height expression, default value is "ih".
- This expression is evaluated just once during configuration.
- </p>
- </dd>
- <dt><samp class="option">bilinear</samp></dt>
- <dd><p>Enable bilinear interpolation if set to 1, a value of 0 disables
- it. Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">fillcolor, c</samp></dt>
- <dd><p>Set the color used to fill the output area not covered by the rotated
- image. For the general syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- If the special value "none" is selected then no
- background is printed (useful for example if the background is never shown).
- </p>
- <p>Default value is "black".
- </p></dd>
- </dl>
- <p>The expressions for the angle and the output size can contain the
- following constants and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>sequential number of the input frame, starting from 0. It is always NAN
- before the first frame is filtered.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>time in seconds of the input frame, it is set to 0 when the filter is
- configured. It is always NAN before the first frame is filtered.
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>horizontal and vertical chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><samp class="option">in_w, iw</samp></dt>
- <dt><samp class="option">in_h, ih</samp></dt>
- <dd><p>the input video width and height
- </p>
- </dd>
- <dt><samp class="option">out_w, ow</samp></dt>
- <dt><samp class="option">out_h, oh</samp></dt>
- <dd><p>the output width and height, that is the size of the padded area as
- specified by the <var class="var">width</var> and <var class="var">height</var> expressions
- </p>
- </dd>
- <dt><samp class="option">rotw(a)</samp></dt>
- <dt><samp class="option">roth(a)</samp></dt>
- <dd><p>the minimal width/height required for completely containing the input
- video rotated by <var class="var">a</var> radians.
- </p>
- <p>These are only available when computing the <samp class="option">out_w</samp> and
- <samp class="option">out_h</samp> expressions.
- </p></dd>
- </dl>
- <a name="Examples-158"></a>
- <h4 class="subsection">39.213.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-158" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-158" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Rotate the input by PI/6 radians clockwise:
- <div class="example">
- <pre class="example-preformatted">rotate=PI/6
- </pre></div>
- </li><li>Rotate the input by PI/6 radians counter-clockwise:
- <div class="example">
- <pre class="example-preformatted">rotate=-PI/6
- </pre></div>
- </li><li>Rotate the input by 45 degrees clockwise:
- <div class="example">
- <pre class="example-preformatted">rotate=45*PI/180
- </pre></div>
- </li><li>Apply a constant rotation with period T, starting from an angle of PI/3:
- <div class="example">
- <pre class="example-preformatted">rotate=PI/3+2*PI*t/T
- </pre></div>
- </li><li>Make the input video rotation oscillating with a period of T
- seconds and an amplitude of A radians:
- <div class="example">
- <pre class="example-preformatted">rotate=A*sin(2*PI/T*t)
- </pre></div>
- </li><li>Rotate the video, output size is chosen so that the whole rotating
- input video is always completely contained in the output:
- <div class="example">
- <pre class="example-preformatted">rotate='2*PI*t:ow=hypot(iw,ih):oh=ow'
- </pre></div>
- </li><li>Rotate the video, reduce the output size so that no background is ever
- shown:
- <div class="example">
- <pre class="example-preformatted">rotate=2*PI*t:ow='min(iw,ih)/sqrt(2)':oh=ow:c=none
- </pre></div>
- </li></ul>
- <a name="Commands-137"></a>
- <h4 class="subsection">39.213.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-137" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-137" aria-hidden="true">TOC</a></span></h4>
- <p>The filter supports the following commands:
- </p>
- <dl class="table">
- <dt><samp class="option">a, angle</samp></dt>
- <dd><p>Set the angle expression.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="sab"></a>
- <h3 class="section">39.214 sab<span class="pull-right"><a class="anchor hidden-xs" href="#sab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sab" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Shape Adaptive Blur.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_radius, lr</samp></dt>
- <dd><p>Set luma blur filter strength, must be a value in range 0.1-4.0, default
- value is 1.0. A greater value will result in a more blurred image, and
- in slower processing.
- </p>
- </dd>
- <dt><samp class="option">luma_pre_filter_radius, lpfr</samp></dt>
- <dd><p>Set luma pre-filter radius, must be a value in the 0.1-2.0 range, default
- value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">luma_strength, ls</samp></dt>
- <dd><p>Set luma maximum difference between pixels to still be considered, must
- be a value in the 0.1-100.0 range, default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">chroma_radius, cr</samp></dt>
- <dd><p>Set chroma blur filter strength, must be a value in range -0.9-4.0. A
- greater value will result in a more blurred image, and in slower
- processing.
- </p>
- </dd>
- <dt><samp class="option">chroma_pre_filter_radius, cpfr</samp></dt>
- <dd><p>Set chroma pre-filter radius, must be a value in the -0.9-2.0 range.
- </p>
- </dd>
- <dt><samp class="option">chroma_strength, cs</samp></dt>
- <dd><p>Set chroma maximum difference between pixels to still be considered,
- must be a value in the -0.9-100.0 range.
- </p></dd>
- </dl>
- <p>Each chroma option value, if not explicitly specified, is set to the
- corresponding luma option value.
- </p>
- <a class="anchor" id="scale"></a><a name="scale-1"></a>
- <h3 class="section">39.215 scale<span class="pull-right"><a class="anchor hidden-xs" href="#scale-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scale-1" aria-hidden="true">TOC</a></span></h3>
- <p>Scale (resize) the input video, using the libswscale library.
- </p>
- <p>The scale filter forces the output display aspect ratio to be the same
- of the input, by changing the output sample aspect ratio.
- </p>
- <p>If the input image format is different from the format requested by
- the next filter, the scale filter will convert the input to the
- requested format.
- </p>
- <a name="Options-122"></a>
- <h4 class="subsection">39.215.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-122" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-122" aria-hidden="true">TOC</a></span></h4>
- <p>The filter accepts the following options, any of the options supported
- by the libswscale scaler, as well as any of the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>See <a data-manual="ffmpeg-scaler" href="ffmpeg-scaler.html#scaler_005foptions">the ffmpeg-scaler manual</a> for
- the complete list of scaler options.
- </p>
- <dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Set the output video dimension expression. Default value is the input
- dimension.
- </p>
- <p>If the <var class="var">width</var> or <var class="var">w</var> value is 0, the input width is used for
- the output. If the <var class="var">height</var> or <var class="var">h</var> value is 0, the input height
- is used for the output.
- </p>
- <p>If one and only one of the values is -n with n >= 1, the scale filter
- will use a value that maintains the aspect ratio of the input image,
- calculated from the other specified dimension. After that it will,
- however, make sure that the calculated dimension is divisible by n and
- adjust the value if necessary.
- </p>
- <p>If both values are -n with n >= 1, the behavior will be identical to
- both values being set to 0 as previously detailed.
- </p>
- <p>See below for the list of accepted constants for use in the dimension
- expression.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Specify when to evaluate <var class="var">width</var> and <var class="var">height</var> expression. It accepts the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>Only evaluate expressions once during the filter initialization or when a command is processed.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Evaluate expressions for each incoming frame.
- </p>
- </dd>
- </dl>
- <p>Default value is ‘<samp class="samp">init</samp>’.
- </p>
- </dd>
- <dt><samp class="option">interl</samp></dt>
- <dd><p>Set the interlacing mode. It accepts the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">1</samp>’</dt>
- <dd><p>Force interlaced aware scaling.
- </p>
- </dd>
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>Do not apply interlaced scaling.
- </p>
- </dd>
- <dt>‘<samp class="samp">-1</samp>’</dt>
- <dd><p>Select interlaced aware scaling depending on whether the source frames
- are flagged as interlaced or not.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">0</samp>’.
- </p>
- </dd>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>Set libswscale scaling flags. See
- <a data-manual="ffmpeg-scaler" href="ffmpeg-scaler.html#sws_005fflags">the ffmpeg-scaler manual</a> for the
- complete list of values. If not explicitly specified the filter applies
- the default flags.
- </p>
- </dd>
- <dt><samp class="option">param0, param1</samp></dt>
- <dd><p>Set libswscale input parameters for scaling algorithms that need them. See
- <a data-manual="ffmpeg-scaler" href="ffmpeg-scaler.html#sws_005fparams">the ffmpeg-scaler manual</a> for the
- complete documentation. If not explicitly specified the filter applies
- empty parameters.
- </p>
- </dd>
- <dt><samp class="option">intent</samp></dt>
- <dd><p>Set the ICC rendering intent to use when transforming between different color
- spaces. It accepts the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">perceptual</samp>’</dt>
- <dd><p>Use a perceptually guided tone and gamut mapping curve. The exact details of
- the mapping used may change at any time and should not be relied on as stable.
- This intent is recommended for final viewing of image/video content in typical
- viewing settings.
- </p>
- </dd>
- <dt>‘<samp class="samp">relative_colorimetric</samp>’</dt>
- <dd><p>Statically clip out-of-gamut colors using a colorimetric clipping curve which
- attempts to find the colorimetrically least dissimilar in-gamut color. This
- intent performs white point adaptation and black point adaptation. This is
- the default. This intent is recommended wherever faithful color reproduction
- is of the utmost importance, even at the cost of clipping.
- </p>
- </dd>
- <dt>‘<samp class="samp">absolute_colorimetric</samp>’</dt>
- <dd><p>Hard clip out-of-gamut colors with no attempt at white or black point
- reproduction. This intent will reproduce in-gamut colors 1:1 on the output
- display as they would appear on the reference display, assuming the output
- display is appropriately calibrated.
- </p>
- </dd>
- <dt>‘<samp class="samp">saturation</samp>’</dt>
- <dd><p>Performs saturation mapping - that is, stretches the input color volume
- directly onto the output color volume, in non-linear fashion that preserves the
- original signal appearance as much as possible. This intent is recommended for
- signal content evaluation, as it will not lead to any clipping. It is roughly
- analogous to not performing any color mapping, although it still takes into
- account the mastering display primaries and any differences in encoding TRC.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set the video size. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">in_color_matrix</samp></dt>
- <dt><samp class="option">out_color_matrix</samp></dt>
- <dd><p>Set in/output YCbCr color space type.
- </p>
- <p>This allows the autodetected value to be overridden as well as allows forcing
- a specific value used for the output and encoder.
- </p>
- <p>If not specified, the color space type depends on the pixel format.
- </p>
- <p>Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Choose automatically.
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>Format conforming to International Telecommunication Union (ITU)
- Recommendation BT.709.
- </p>
- </dd>
- <dt>‘<samp class="samp">fcc</samp>’</dt>
- <dd><p>Set color space conforming to the United States Federal Communications
- Commission (FCC) Code of Federal Regulations (CFR) Title 47 (2003) 73.682 (a).
- </p>
- </dd>
- <dt>‘<samp class="samp">bt601</samp>’</dt>
- <dt>‘<samp class="samp">bt470</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>Set color space conforming to:
- </p>
- <ul class="itemize mark-bullet">
- <li>ITU Radiocommunication Sector (ITU-R) Recommendation BT.601
- </li><li>ITU-R Rec. BT.470-6 (1998) Systems B, B1, and G
- </li><li>Society of Motion Picture and Television Engineers (SMPTE) ST 170:2004
- </li></ul>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>Set color space conforming to SMPTE ST 240:1999.
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>Set color space conforming to ITU-R BT.2020 non-constant luminance system.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">in_range</samp></dt>
- <dt><samp class="option">out_range</samp></dt>
- <dd><p>Set in/output YCbCr sample range.
- </p>
- <p>This allows the autodetected value to be overridden as well as allows forcing
- a specific value used for the output and encoder. If not specified, the
- range depends on the pixel format. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto/unknown</samp>’</dt>
- <dd><p>Choose automatically.
- </p>
- </dd>
- <dt>‘<samp class="samp">jpeg/full/pc</samp>’</dt>
- <dd><p>Set full range (0-255 in case of 8-bit luma).
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg/limited/tv</samp>’</dt>
- <dd><p>Set "MPEG" range (16-235 in case of 8-bit luma).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">in_chroma_loc</samp></dt>
- <dt><samp class="option">out_chroma_loc</samp></dt>
- <dd><p>Set in/output chroma sample location. If not specified, center-sited chroma
- is used by default. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto, unknown</samp>’</dt>
- <dt>‘<samp class="samp">left</samp>’</dt>
- <dt>‘<samp class="samp">center</samp>’</dt>
- <dt>‘<samp class="samp">topleft</samp>’</dt>
- <dt>‘<samp class="samp">top</samp>’</dt>
- <dt>‘<samp class="samp">bottomleft</samp>’</dt>
- <dt>‘<samp class="samp">bottom</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">in_primaries</samp></dt>
- <dt><samp class="option">out_primaries</samp></dt>
- <dd><p>Set in/output RGB primaries.
- </p>
- <p>This allows the autodetected value to be overridden as well as allows forcing
- a specific value used for the output and encoder. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Choose automatically. This is the default.
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dt>‘<samp class="samp">smpte431</samp>’</dt>
- <dt>‘<samp class="samp">smpte432</samp>’</dt>
- <dt>‘<samp class="samp">jedec-p22</samp>’</dt>
- <dt>‘<samp class="samp">ebu3213</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">in_transfer</samp></dt>
- <dt><samp class="option">out_transfer</samp></dt>
- <dd><p>Set in/output transfer response curve (TRC).
- </p>
- <p>This allows the autodetected value to be overridden as well as allows forcing
- a specific value used for the output and encoder. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Choose automatically. This is the default.
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dt>‘<samp class="samp">gamma22</samp>’</dt>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dt>‘<samp class="samp">gamma28</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dt>‘<samp class="samp">iec61966-2-1</samp>’</dt>
- <dt>‘<samp class="samp">srgb</samp>’</dt>
- <dt>‘<samp class="samp">iec61966-2-4</samp>’</dt>
- <dt>‘<samp class="samp">xvycc</samp>’</dt>
- <dt>‘<samp class="samp">bt1361e</samp>’</dt>
- <dt>‘<samp class="samp">bt2020-10</samp>’</dt>
- <dt>‘<samp class="samp">bt2020-12</samp>’</dt>
- <dt>‘<samp class="samp">smpte2084</samp>’</dt>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dt>‘<samp class="samp">arib-std-b67</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">force_original_aspect_ratio</samp></dt>
- <dd><p>Enable decreasing or increasing output video width or height if necessary to
- keep the original aspect ratio. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">disable</samp>’</dt>
- <dd><p>Scale the video as specified and disable this feature.
- </p>
- </dd>
- <dt>‘<samp class="samp">decrease</samp>’</dt>
- <dd><p>The output video dimensions will automatically be decreased if needed.
- </p>
- </dd>
- <dt>‘<samp class="samp">increase</samp>’</dt>
- <dd><p>The output video dimensions will automatically be increased if needed.
- </p>
- </dd>
- </dl>
- <p>One useful instance of this option is that when you know a specific device’s
- maximum allowed resolution, you can use this to limit the output video to
- that, while retaining the aspect ratio. For example, device A allows
- 1280x720 playback, and your video is 1920x800. Using this option (set it to
- decrease) and specifying 1280x720 to the command line makes the output
- 1280x533.
- </p>
- <p>Please note that this is a different thing than specifying -1 for <samp class="option">w</samp>
- or <samp class="option">h</samp>, you still need to specify the output resolution for this option
- to work.
- </p>
- </dd>
- <dt><samp class="option">force_divisible_by</samp></dt>
- <dd><p>Ensures that both the output dimensions, width and height, are divisible by the
- given integer when used together with <samp class="option">force_original_aspect_ratio</samp>. This
- works similar to using <code class="code">-n</code> in the <samp class="option">w</samp> and <samp class="option">h</samp> options.
- </p>
- <p>This option respects the value set for <samp class="option">force_original_aspect_ratio</samp>,
- increasing or decreasing the resolution accordingly. The video’s aspect ratio
- may be slightly modified.
- </p>
- <p>This option can be handy if you need to have a video fit within or exceed
- a defined resolution using <samp class="option">force_original_aspect_ratio</samp> but also have
- encoder restrictions on width or height divisibility.
- </p>
- </dd>
- <dt><samp class="option">reset_sar</samp></dt>
- <dd><p>Enabling this option leads to the output SAR being reset to 1.
- Additionally, if the user requests proportional scaling either
- through the width or height expressions, e.g. <code class="code">w=-4:h=360</code> or <code class="code">w=iw/2:h=-1</code>
- or by enabling <code class="code">force_original_aspect_ratio</code>, then the input DAR is taken into
- account and the output is scaled to produce square pixels.
- Default is false.
- </p>
- </dd>
- </dl>
- <p>The values of the <samp class="option">w</samp> and <samp class="option">h</samp> options are expressions
- containing the following constants:
- </p>
- <dl class="table">
- <dt><var class="var">in_w</var></dt>
- <dt><var class="var">in_h</var></dt>
- <dd><p>The input width and height
- </p>
- </dd>
- <dt><var class="var">iw</var></dt>
- <dt><var class="var">ih</var></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><var class="var">out_w</var></dt>
- <dt><var class="var">out_h</var></dt>
- <dd><p>The output (scaled) width and height
- </p>
- </dd>
- <dt><var class="var">ow</var></dt>
- <dt><var class="var">oh</var></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>
- </p>
- </dd>
- <dt><var class="var">a</var></dt>
- <dd><p>The same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><var class="var">sar</var></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><var class="var">dar</var></dt>
- <dd><p>The input display aspect ratio. Calculated from <code class="code">(iw / ih) * sar</code>.
- </p>
- </dd>
- <dt><var class="var">hsub</var></dt>
- <dt><var class="var">vsub</var></dt>
- <dd><p>horizontal and vertical input chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><var class="var">ohsub</var></dt>
- <dt><var class="var">ovsub</var></dt>
- <dd><p>horizontal and vertical output chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><var class="var">n</var></dt>
- <dd><p>The (sequential) number of the input frame, starting from 0.
- Only available with <code class="code">eval=frame</code>.
- </p>
- </dd>
- <dt><var class="var">t</var></dt>
- <dd><p>The presentation timestamp of the input frame, expressed as a number of
- seconds. Only available with <code class="code">eval=frame</code>.
- </p>
- </dd>
- <dt><var class="var">pos</var></dt>
- <dd><p>The position (byte offset) of the frame in the input stream, or NaN if
- this information is unavailable and/or meaningless (for example in case of synthetic video).
- Only available with <code class="code">eval=frame</code>.
- Deprecated, do not use.
- </p>
- </dd>
- <dt><var class="var">ref_w, rw</var></dt>
- <dt><var class="var">ref_h, rh</var></dt>
- <dt><var class="var">ref_a</var></dt>
- <dt><var class="var">ref_dar, rdar</var></dt>
- <dt><var class="var">ref_n</var></dt>
- <dt><var class="var">ref_t</var></dt>
- <dt><var class="var">ref_pos</var></dt>
- <dd><p>Eqvuialent to the above, but for a second reference input. If any of these
- variables are present, this filter accepts two inputs.
- </p></dd>
- </dl>
- <a name="Examples-159"></a>
- <h4 class="subsection">39.215.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-159" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-159" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Scale the input video to a size of 200x100
- <div class="example">
- <pre class="example-preformatted">scale=w=200:h=100
- </pre></div>
- <p>This is equivalent to:
- </p><div class="example">
- <pre class="example-preformatted">scale=200:100
- </pre></div>
- <p>or:
- </p><div class="example">
- <pre class="example-preformatted">scale=200x100
- </pre></div>
- </li><li>Specify a size abbreviation for the output size:
- <div class="example">
- <pre class="example-preformatted">scale=qcif
- </pre></div>
- <p>which can also be written as:
- </p><div class="example">
- <pre class="example-preformatted">scale=size=qcif
- </pre></div>
- </li><li>Scale the input to 2x:
- <div class="example">
- <pre class="example-preformatted">scale=w=2*iw:h=2*ih
- </pre></div>
- </li><li>The above is the same as:
- <div class="example">
- <pre class="example-preformatted">scale=2*in_w:2*in_h
- </pre></div>
- </li><li>Scale the input to 2x with forced interlaced scaling:
- <div class="example">
- <pre class="example-preformatted">scale=2*iw:2*ih:interl=1
- </pre></div>
- </li><li>Scale the input to half size:
- <div class="example">
- <pre class="example-preformatted">scale=w=iw/2:h=ih/2
- </pre></div>
- </li><li>Increase the width, and set the height to the same size:
- <div class="example">
- <pre class="example-preformatted">scale=3/2*iw:ow
- </pre></div>
- </li><li>Seek Greek harmony:
- <div class="example">
- <pre class="example-preformatted">scale=iw:1/PHI*iw
- scale=ih*PHI:ih
- </pre></div>
- </li><li>Increase the height, and set the width to 3/2 of the height:
- <div class="example">
- <pre class="example-preformatted">scale=w=3/2*oh:h=3/5*ih
- </pre></div>
- </li><li>Increase the size, making the size a multiple of the chroma
- subsample values:
- <div class="example">
- <pre class="example-preformatted">scale="trunc(3/2*iw/hsub)*hsub:trunc(3/2*ih/vsub)*vsub"
- </pre></div>
- </li><li>Increase the width to a maximum of 500 pixels,
- keeping the same aspect ratio as the input:
- <div class="example">
- <pre class="example-preformatted">scale=w='min(500\, iw*3/2):h=-1'
- </pre></div>
- </li><li>Make pixels square by combining scale and setsar:
- <div class="example">
- <pre class="example-preformatted">scale='trunc(ih*dar):ih',setsar=1/1
- </pre></div>
- </li><li>Make pixels square using reset_sar,
- making sure the resulting resolution is even (required by some codecs):
- <div class="example">
- <pre class="example-preformatted">scale='-2:ih-mod(ih,2):reset_sar=1'
- </pre></div>
- </li><li>Scale to target exactly, however reset SAR to 1:
- <div class="example">
- <pre class="example-preformatted">scale='400:300:reset_sar=1'
- </pre></div>
- </li><li>Scale to even dimensions that fit within 400x300, preserving input SAR:
- <div class="example">
- <pre class="example-preformatted">scale='400:300:force_original_aspect_ratio=decrease:force_divisible_by=2'
- </pre></div>
- </li><li>Scale to produce square pixels with even dimensions that fit within 400x300:
- <div class="example">
- <pre class="example-preformatted">scale='400:300:force_original_aspect_ratio=decrease:force_divisible_by=2:reset_sar=1'
- </pre></div>
- </li><li>Scale a subtitle stream (sub) to match the main video (main) in size before
- overlaying. ("scale2ref")
- <div class="example">
- <pre class="example-preformatted">'[main]split[a][b]; [ref][a]scale=rw:rh[c]; [b][c]overlay'
- </pre></div>
- </li><li>Scale a logo to 1/10th the height of a video, while preserving its display
- aspect ratio.
- <div class="example">
- <pre class="example-preformatted">[logo-in][video-in]scale=w=oh*dar:h=rh/10[logo-out]
- </pre></div>
- </li></ul>
- <a name="Commands-138"></a>
- <h4 class="subsection">39.215.3 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-138" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-138" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Set the output video dimension expression.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="scharr"></a>
- <h3 class="section">39.216 scharr<span class="pull-right"><a class="anchor hidden-xs" href="#scharr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scharr" aria-hidden="true">TOC</a></span></h3>
- <p>Apply scharr operator to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- </p></dd>
- </dl>
- <a name="Commands-139"></a>
- <h4 class="subsection">39.216.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-139" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-139" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="scroll"></a>
- <h3 class="section">39.217 scroll<span class="pull-right"><a class="anchor hidden-xs" href="#scroll" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scroll" aria-hidden="true">TOC</a></span></h3>
- <p>Scroll input video horizontally and/or vertically by constant speed.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">horizontal, h</samp></dt>
- <dd><p>Set the horizontal scrolling speed. Default is 0. Allowed range is from -1 to 1.
- Negative values changes scrolling direction.
- </p>
- </dd>
- <dt><samp class="option">vertical, v</samp></dt>
- <dd><p>Set the vertical scrolling speed. Default is 0. Allowed range is from -1 to 1.
- Negative values changes scrolling direction.
- </p>
- </dd>
- <dt><samp class="option">hpos</samp></dt>
- <dd><p>Set the initial horizontal scrolling position. Default is 0. Allowed range is from 0 to 1.
- </p>
- </dd>
- <dt><samp class="option">vpos</samp></dt>
- <dd><p>Set the initial vertical scrolling position. Default is 0. Allowed range is from 0 to 1.
- </p></dd>
- </dl>
- <a name="Commands-140"></a>
- <h4 class="subsection">39.217.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-140" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-140" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following <a class="ref" href="#commands">commands</a>:
- </p><dl class="table">
- <dt><samp class="option">horizontal, h</samp></dt>
- <dd><p>Set the horizontal scrolling speed.
- </p></dd>
- <dt><samp class="option">vertical, v</samp></dt>
- <dd><p>Set the vertical scrolling speed.
- </p></dd>
- </dl>
- <a class="anchor" id="scdet"></a><a name="scdet-1"></a>
- <h3 class="section">39.218 scdet<span class="pull-right"><a class="anchor hidden-xs" href="#scdet-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scdet-1" aria-hidden="true">TOC</a></span></h3>
- <p>Detect video scene change.
- </p>
- <p>This filter sets frame metadata with mafd between frame, the scene score, and
- forward the frame to the next filter, so they can use these metadata to detect
- scene change or others.
- </p>
- <p>In addition, this filter logs a message and sets frame metadata when it detects
- a scene change by <samp class="option">threshold</samp>.
- </p>
- <p><code class="code">lavfi.scd.mafd</code> metadata keys are set with mafd for every frame.
- </p>
- <p><code class="code">lavfi.scd.score</code> metadata keys are set with scene change score for every frame
- to detect scene change.
- </p>
- <p><code class="code">lavfi.scd.time</code> metadata keys are set with current filtered frame time which
- detect scene change with <samp class="option">threshold</samp>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold, t</samp></dt>
- <dd><p>Set the scene change detection threshold as a percentage of maximum change. Good
- values are in the <code class="code">[8.0, 14.0]</code> range. The range for <samp class="option">threshold</samp> is
- <code class="code">[0., 100.]</code>.
- </p>
- <p>Default value is <code class="code">10.</code>.
- </p>
- </dd>
- <dt><samp class="option">sc_pass, s</samp></dt>
- <dd><p>Set the flag to pass scene change frames to the next filter. Default value is <code class="code">0</code>
- You can enable it if you want to get snapshot of scene change frames only.
- </p></dd>
- </dl>
- <a class="anchor" id="selectivecolor"></a><a name="selectivecolor-1"></a>
- <h3 class="section">39.219 selectivecolor<span class="pull-right"><a class="anchor hidden-xs" href="#selectivecolor-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-selectivecolor-1" aria-hidden="true">TOC</a></span></h3>
- <p>Adjust cyan, magenta, yellow and black (CMYK) to certain ranges of colors (such
- as "reds", "yellows", "greens", "cyans", ...). The adjustment range is defined
- by the "purity" of the color (that is, how saturated it already is).
- </p>
- <p>This filter is similar to the Adobe Photoshop Selective Color tool.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">correction_method</samp></dt>
- <dd><p>Select color correction method.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">absolute</samp>’</dt>
- <dd><p>Specified adjustments are applied "as-is" (added/subtracted to original pixel
- component value).
- </p></dd>
- <dt>‘<samp class="samp">relative</samp>’</dt>
- <dd><p>Specified adjustments are relative to the original component value.
- </p></dd>
- </dl>
- <p>Default is <code class="code">absolute</code>.
- </p></dd>
- <dt><samp class="option">reds</samp></dt>
- <dd><p>Adjustments for red pixels (pixels where the red component is the maximum)
- </p></dd>
- <dt><samp class="option">yellows</samp></dt>
- <dd><p>Adjustments for yellow pixels (pixels where the blue component is the minimum)
- </p></dd>
- <dt><samp class="option">greens</samp></dt>
- <dd><p>Adjustments for green pixels (pixels where the green component is the maximum)
- </p></dd>
- <dt><samp class="option">cyans</samp></dt>
- <dd><p>Adjustments for cyan pixels (pixels where the red component is the minimum)
- </p></dd>
- <dt><samp class="option">blues</samp></dt>
- <dd><p>Adjustments for blue pixels (pixels where the blue component is the maximum)
- </p></dd>
- <dt><samp class="option">magentas</samp></dt>
- <dd><p>Adjustments for magenta pixels (pixels where the green component is the minimum)
- </p></dd>
- <dt><samp class="option">whites</samp></dt>
- <dd><p>Adjustments for white pixels (pixels where all components are greater than 128)
- </p></dd>
- <dt><samp class="option">neutrals</samp></dt>
- <dd><p>Adjustments for all pixels except pure black and pure white
- </p></dd>
- <dt><samp class="option">blacks</samp></dt>
- <dd><p>Adjustments for black pixels (pixels where all components are lesser than 128)
- </p></dd>
- <dt><samp class="option">psfile</samp></dt>
- <dd><p>Specify a Photoshop selective color file (<code class="code">.asv</code>) to import the settings from.
- </p></dd>
- </dl>
- <p>All the adjustment settings (<samp class="option">reds</samp>, <samp class="option">yellows</samp>, ...) accept up to
- 4 space separated floating point adjustment values in the [-1,1] range,
- respectively to adjust the amount of cyan, magenta, yellow and black for the
- pixels of its range.
- </p>
- <a name="Examples-160"></a>
- <h4 class="subsection">39.219.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-160" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-160" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Increase cyan by 50% and reduce yellow by 33% in every green areas, and
- increase magenta by 27% in blue areas:
- <div class="example">
- <pre class="example-preformatted">selectivecolor=greens=.5 0 -.33 0:blues=0 .27
- </pre></div>
- </li><li>Use a Photoshop selective color preset:
- <div class="example">
- <pre class="example-preformatted">selectivecolor=psfile=MySelectiveColorPresets/Misty.asv
- </pre></div>
- </li></ul>
- <a class="anchor" id="separatefields"></a><a name="separatefields-1"></a>
- <h3 class="section">39.220 separatefields<span class="pull-right"><a class="anchor hidden-xs" href="#separatefields-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-separatefields-1" aria-hidden="true">TOC</a></span></h3>
- <p>The <code class="code">separatefields</code> takes a frame-based video input and splits
- each frame into its components fields, producing a new half height clip
- with twice the frame rate and twice the frame count.
- </p>
- <p>This filter use field-dominance information in frame to decide which
- of each pair of fields to place first in the output.
- If it gets it wrong use <a class="ref" href="#setfield">setfield</a> filter before <code class="code">separatefields</code> filter.
- </p>
- <a name="setdar_002c-setsar"></a>
- <h3 class="section">39.221 setdar, setsar<span class="pull-right"><a class="anchor hidden-xs" href="#setdar_002c-setsar" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-setdar_002c-setsar" aria-hidden="true">TOC</a></span></h3>
- <p>The <code class="code">setdar</code> filter sets the Display Aspect Ratio for the filter
- output video.
- </p>
- <p>This is done by changing the specified Sample (aka Pixel) Aspect
- Ratio, according to the following equation:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">DAR</var> = <var class="var">HORIZONTAL_RESOLUTION</var> / <var class="var">VERTICAL_RESOLUTION</var> * <var class="var">SAR</var>
- </pre></div>
- <p>Keep in mind that the <code class="code">setdar</code> filter does not modify the pixel
- dimensions of the video frame. Also, the display aspect ratio set by
- this filter may be changed by later filters in the filterchain,
- e.g. in case of scaling or if another "setdar" or a "setsar" filter is
- applied.
- </p>
- <p>The <code class="code">setsar</code> filter sets the Sample (aka Pixel) Aspect Ratio for
- the filter output video.
- </p>
- <p>Note that as a consequence of the application of this filter, the
- output display aspect ratio will change according to the equation
- above.
- </p>
- <p>Keep in mind that the sample aspect ratio set by the <code class="code">setsar</code>
- filter may be changed by later filters in the filterchain, e.g. if
- another "setsar" or a "setdar" filter is applied.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">r, ratio, dar (<code class="code">setdar</code> only), sar (<code class="code">setsar</code> only)</samp></dt>
- <dd><p>Set the aspect ratio used by the filter.
- </p>
- <p>The parameter can be a floating point number string, or an expression. If the
- parameter is not specified, the value "0" is assumed, meaning that the same
- input value is used.
- </p>
- </dd>
- <dt><samp class="option">max</samp></dt>
- <dd><p>Set the maximum integer value to use for expressing numerator and
- denominator when reducing the expressed aspect ratio to a rational.
- Default value is <code class="code">100</code>.
- </p>
- </dd>
- </dl>
- <p>The parameter <var class="var">sar</var> is an expression containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">w, h</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>Same as <var class="var">w</var> / <var class="var">h</var>.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>The input sample aspect ratio.
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>The input display aspect ratio. It is the same as
- (<var class="var">w</var> / <var class="var">h</var>) * <var class="var">sar</var>.
- </p>
- </dd>
- <dt><samp class="option">hsub, vsub</samp></dt>
- <dd><p>Horizontal and vertical chroma subsample values. For example, for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p></dd>
- </dl>
- <a name="Examples-161"></a>
- <h4 class="subsection">39.221.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-161" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-161" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>To change the display aspect ratio to 16:9, specify one of the following:
- <div class="example">
- <pre class="example-preformatted">setdar=dar=1.77777
- setdar=dar=16/9
- </pre></div>
- </li><li>To change the sample aspect ratio to 10:11, specify:
- <div class="example">
- <pre class="example-preformatted">setsar=sar=10/11
- </pre></div>
- </li><li>To set a display aspect ratio of 16:9, and specify a maximum integer value of
- 1000 in the aspect ratio reduction, use the command:
- <div class="example">
- <pre class="example-preformatted">setdar=ratio=16/9:max=1000
- </pre></div>
- </li></ul>
- <a class="anchor" id="setfield"></a><a name="setfield-1"></a>
- <h3 class="section">39.222 setfield<span class="pull-right"><a class="anchor hidden-xs" href="#setfield-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-setfield-1" aria-hidden="true">TOC</a></span></h3>
- <p>Force field for the output video frame.
- </p>
- <p>The <code class="code">setfield</code> filter marks the interlace type field for the
- output frames. It does not change the input frame, but only sets the
- corresponding property, which affects how the frame is treated by
- following filters (e.g. <code class="code">fieldorder</code> or <code class="code">yadif</code>).
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same field property.
- </p>
- </dd>
- <dt>‘<samp class="samp">bff</samp>’</dt>
- <dd><p>Mark the frame as bottom-field-first.
- </p>
- </dd>
- <dt>‘<samp class="samp">tff</samp>’</dt>
- <dd><p>Mark the frame as top-field-first.
- </p>
- </dd>
- <dt>‘<samp class="samp">prog</samp>’</dt>
- <dd><p>Mark the frame as progressive.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="setparams"></a><a name="setparams-1"></a>
- <h3 class="section">39.223 setparams<span class="pull-right"><a class="anchor hidden-xs" href="#setparams-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-setparams-1" aria-hidden="true">TOC</a></span></h3>
- <p>Force frame parameter for the output video frame.
- </p>
- <p>The <code class="code">setparams</code> filter marks interlace and color range for the
- output frames. It does not change the input frame, but only sets the
- corresponding property, which affects how the frame is treated by
- filters/encoders.
- </p>
- <dl class="table">
- <dt><samp class="option">field_mode</samp></dt>
- <dd><p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same field property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">bff</samp>’</dt>
- <dd><p>Mark the frame as bottom-field-first.
- </p>
- </dd>
- <dt>‘<samp class="samp">tff</samp>’</dt>
- <dd><p>Mark the frame as top-field-first.
- </p>
- </dd>
- <dt>‘<samp class="samp">prog</samp>’</dt>
- <dd><p>Mark the frame as progressive.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same color range property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">unspecified, unknown</samp>’</dt>
- <dd><p>Mark the frame as unspecified color range.
- </p>
- </dd>
- <dt>‘<samp class="samp">limited, tv, mpeg</samp>’</dt>
- <dd><p>Mark the frame as limited range.
- </p>
- </dd>
- <dt>‘<samp class="samp">full, pc, jpeg</samp>’</dt>
- <dd><p>Mark the frame as full range.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">color_primaries</samp></dt>
- <dd><p>Set the color primaries.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same color primaries property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dt>‘<samp class="samp">smpte431</samp>’</dt>
- <dt>‘<samp class="samp">smpte432</samp>’</dt>
- <dt>‘<samp class="samp">jedec-p22</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">color_trc</samp></dt>
- <dd><p>Set the color transfer.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same color trc property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dt>‘<samp class="samp">log100</samp>’</dt>
- <dt>‘<samp class="samp">log316</samp>’</dt>
- <dt>‘<samp class="samp">iec61966-2-4</samp>’</dt>
- <dt>‘<samp class="samp">bt1361e</samp>’</dt>
- <dt>‘<samp class="samp">iec61966-2-1</samp>’</dt>
- <dt>‘<samp class="samp">bt2020-10</samp>’</dt>
- <dt>‘<samp class="samp">bt2020-12</samp>’</dt>
- <dt>‘<samp class="samp">smpte2084</samp>’</dt>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dt>‘<samp class="samp">arib-std-b67</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">colorspace</samp></dt>
- <dd><p>Set the colorspace.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same colorspace property (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">gbr</samp>’</dt>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dt>‘<samp class="samp">unknown</samp>’</dt>
- <dt>‘<samp class="samp">fcc</samp>’</dt>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dt>‘<samp class="samp">ycgco</samp>’</dt>
- <dt>‘<samp class="samp">bt2020nc</samp>’</dt>
- <dt>‘<samp class="samp">bt2020c</samp>’</dt>
- <dt>‘<samp class="samp">smpte2085</samp>’</dt>
- <dt>‘<samp class="samp">chroma-derived-nc</samp>’</dt>
- <dt>‘<samp class="samp">chroma-derived-c</samp>’</dt>
- <dt>‘<samp class="samp">ictcp</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">chroma_location</samp></dt>
- <dd><p>Set the chroma sample location.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same chroma location (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">unspecified, unknown</samp>’</dt>
- <dt>‘<samp class="samp">left</samp>’</dt>
- <dt>‘<samp class="samp">center</samp>’</dt>
- <dt>‘<samp class="samp">topleft</samp>’</dt>
- <dt>‘<samp class="samp">top</samp>’</dt>
- <dt>‘<samp class="samp">bottomleft</samp>’</dt>
- <dt>‘<samp class="samp">bottom</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">alpha_mode</samp></dt>
- <dd><p>Set the alpha moda.
- Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same alpha mode (default).
- </p>
- </dd>
- <dt>‘<samp class="samp">unspecified, unknown</samp>’</dt>
- <dt>‘<samp class="samp">premultiplied</samp>’</dt>
- <dt>‘<samp class="samp">straight</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="shear"></a>
- <h3 class="section">39.224 shear<span class="pull-right"><a class="anchor hidden-xs" href="#shear" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-shear" aria-hidden="true">TOC</a></span></h3>
- <p>Apply shear transform to input video.
- </p>
- <p>This filter supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">shx</samp></dt>
- <dd><p>Shear factor in X-direction. Default value is 0.
- Allowed range is from -2 to 2.
- </p>
- </dd>
- <dt><samp class="option">shy</samp></dt>
- <dd><p>Shear factor in Y-direction. Default value is 0.
- Allowed range is from -2 to 2.
- </p>
- </dd>
- <dt><samp class="option">fillcolor, c</samp></dt>
- <dd><p>Set the color used to fill the output area not covered by the transformed
- video. For the general syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- If the special value "none" is selected then no
- background is printed (useful for example if the background is never shown).
- </p>
- <p>Default value is "black".
- </p>
- </dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Set interpolation type. Can be <code class="code">bilinear</code> or <code class="code">nearest</code>. Default is <code class="code">bilinear</code>.
- </p></dd>
- </dl>
- <a name="Commands-141"></a>
- <h4 class="subsection">39.224.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-141" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-141" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="showinfo-1"></a>
- <h3 class="section">39.225 showinfo<span class="pull-right"><a class="anchor hidden-xs" href="#showinfo-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showinfo-1" aria-hidden="true">TOC</a></span></h3>
- <p>Show a line containing various information for each input video frame.
- The input video is not modified.
- </p>
- <p>This filter supports the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">checksum</samp></dt>
- <dd><p>Calculate checksums of each plane. By default enabled.
- </p>
- </dd>
- <dt><samp class="option">udu_sei_as_ascii</samp></dt>
- <dd><p>Try to print user data unregistered SEI as ascii character when possible,
- in hex format otherwise.
- </p></dd>
- </dl>
- <p>The shown line contains a sequence of key/value pairs of the form
- <var class="var">key</var>:<var class="var">value</var>.
- </p>
- <p>The following values are shown in the output:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>The (sequential) number of the input frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>The Presentation TimeStamp of the input frame, expressed as a number of
- time base units. The time base unit depends on the filter input pad.
- </p>
- </dd>
- <dt><samp class="option">pts_time</samp></dt>
- <dd><p>The Presentation TimeStamp of the input frame, expressed as a number of
- seconds.
- </p>
- </dd>
- <dt><samp class="option">fmt</samp></dt>
- <dd><p>The pixel format name.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>The sample aspect ratio of the input frame, expressed in the form
- <var class="var">num</var>/<var class="var">den</var>.
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>The size of the input frame. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">i</samp></dt>
- <dd><p>The type of interlaced mode ("P" for "progressive", "T" for top field first, "B"
- for bottom field first).
- </p>
- </dd>
- <dt><samp class="option">iskey</samp></dt>
- <dd><p>This is 1 if the frame is a key frame, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>The picture type of the input frame ("I" for an I-frame, "P" for a
- P-frame, "B" for a B-frame, or "?" for an unknown type).
- Also refer to the documentation of the <code class="code">AVPictureType</code> enum and of
- the <code class="code">av_get_picture_type_char</code> function defined in
- <samp class="file">libavutil/avutil.h</samp>.
- </p>
- </dd>
- <dt><samp class="option">checksum</samp></dt>
- <dd><p>The Adler-32 checksum (printed in hexadecimal) of all the planes of the input frame.
- </p>
- </dd>
- <dt><samp class="option">plane_checksum</samp></dt>
- <dd><p>The Adler-32 checksum (printed in hexadecimal) of each plane of the input frame,
- expressed in the form "[<var class="var">c0</var> <var class="var">c1</var> <var class="var">c2</var> <var class="var">c3</var>]".
- </p>
- </dd>
- <dt><samp class="option">mean</samp></dt>
- <dd><p>The mean value of pixels in each plane of the input frame, expressed in the form
- "[<var class="var">mean0</var> <var class="var">mean1</var> <var class="var">mean2</var> <var class="var">mean3</var>]".
- </p>
- </dd>
- <dt><samp class="option">stdev</samp></dt>
- <dd><p>The standard deviation of pixel values in each plane of the input frame, expressed
- in the form "[<var class="var">stdev0</var> <var class="var">stdev1</var> <var class="var">stdev2</var> <var class="var">stdev3</var>]".
- </p>
- </dd>
- </dl>
- <a name="showpalette"></a>
- <h3 class="section">39.226 showpalette<span class="pull-right"><a class="anchor hidden-xs" href="#showpalette" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showpalette" aria-hidden="true">TOC</a></span></h3>
- <p>Displays the 256 colors palette of each frame. This filter is only relevant for
- <var class="var">pal8</var> pixel format frames.
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set the size of the box used to represent one palette color entry. Default is
- <code class="code">30</code> (for a <code class="code">30x30</code> pixel box).
- </p></dd>
- </dl>
- <a name="shuffleframes"></a>
- <h3 class="section">39.227 shuffleframes<span class="pull-right"><a class="anchor hidden-xs" href="#shuffleframes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-shuffleframes" aria-hidden="true">TOC</a></span></h3>
- <p>Reorder and/or duplicate and/or drop video frames.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mapping</samp></dt>
- <dd><p>Set the destination indexes of input frames.
- This is space or ’|’ separated list of indexes that maps input frames to output
- frames. Number of indexes also sets maximal value that each index may have.
- ’-1’ index have special meaning and that is to drop frame.
- </p></dd>
- </dl>
- <p>The first frame has the index 0. The default is to keep the input unchanged.
- </p>
- <a name="Examples-162"></a>
- <h4 class="subsection">39.227.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-162" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-162" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Swap second and third frame of every three frames of the input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf "shuffleframes=0 2 1" OUTPUT
- </pre></div>
- </li><li>Swap 10th and 1st frame of every ten frames of the input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf "shuffleframes=9 1 2 3 4 5 6 7 8 0" OUTPUT
- </pre></div>
- </li></ul>
- <a name="shufflepixels"></a>
- <h3 class="section">39.228 shufflepixels<span class="pull-right"><a class="anchor hidden-xs" href="#shufflepixels" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-shufflepixels" aria-hidden="true">TOC</a></span></h3>
- <p>Reorder pixels in video frames.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">direction, d</samp></dt>
- <dd><p>Set shuffle direction. Can be forward or inverse direction.
- Default direction is forward.
- </p>
- </dd>
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set shuffle mode. Can be horizontal, vertical or block mode.
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Set shuffle block_size. In case of horizontal shuffle mode only width
- part of size is used, and in case of vertical shuffle mode only height
- part of size is used.
- </p>
- </dd>
- <dt><samp class="option">seed, s</samp></dt>
- <dd><p>Set random seed used with shuffling pixels. Mainly useful to set to be able
- to reverse filtering process to get original input.
- For example, to reverse forward shuffle you need to use same parameters
- and exact same seed and to set direction to inverse.
- </p></dd>
- </dl>
- <a name="shuffleplanes"></a>
- <h3 class="section">39.229 shuffleplanes<span class="pull-right"><a class="anchor hidden-xs" href="#shuffleplanes" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-shuffleplanes" aria-hidden="true">TOC</a></span></h3>
- <p>Reorder and/or duplicate video planes.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">map0</samp></dt>
- <dd><p>The index of the input plane to be used as the first output plane.
- </p>
- </dd>
- <dt><samp class="option">map1</samp></dt>
- <dd><p>The index of the input plane to be used as the second output plane.
- </p>
- </dd>
- <dt><samp class="option">map2</samp></dt>
- <dd><p>The index of the input plane to be used as the third output plane.
- </p>
- </dd>
- <dt><samp class="option">map3</samp></dt>
- <dd><p>The index of the input plane to be used as the fourth output plane.
- </p>
- </dd>
- </dl>
- <p>The first plane has the index 0. The default is to keep the input unchanged.
- </p>
- <a name="Examples-163"></a>
- <h4 class="subsection">39.229.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-163" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-163" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Swap the second and third planes of the input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf shuffleplanes=0:2:1:3 OUTPUT
- </pre></div>
- </li></ul>
- <a class="anchor" id="signalstats"></a><a name="signalstats-1"></a>
- <h3 class="section">39.230 signalstats<span class="pull-right"><a class="anchor hidden-xs" href="#signalstats-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-signalstats-1" aria-hidden="true">TOC</a></span></h3>
- <p>Evaluate various visual metrics that assist in determining issues associated
- with the digitization of analog video media.
- </p>
- <p>By default the filter will log these metadata values:
- </p>
- <dl class="table">
- <dt><samp class="option">YMIN</samp></dt>
- <dd><p>Display the minimal Y value contained within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">YLOW</samp></dt>
- <dd><p>Display the Y value at the 10% percentile within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">YAVG</samp></dt>
- <dd><p>Display the average Y value within the input frame. Expressed in range of
- [0-255].
- </p>
- </dd>
- <dt><samp class="option">YHIGH</samp></dt>
- <dd><p>Display the Y value at the 90% percentile within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">YMAX</samp></dt>
- <dd><p>Display the maximum Y value contained within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">UMIN</samp></dt>
- <dd><p>Display the minimal U value contained within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">ULOW</samp></dt>
- <dd><p>Display the U value at the 10% percentile within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">UAVG</samp></dt>
- <dd><p>Display the average U value within the input frame. Expressed in range of
- [0-255].
- </p>
- </dd>
- <dt><samp class="option">UHIGH</samp></dt>
- <dd><p>Display the U value at the 90% percentile within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">UMAX</samp></dt>
- <dd><p>Display the maximum U value contained within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">VMIN</samp></dt>
- <dd><p>Display the minimal V value contained within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">VLOW</samp></dt>
- <dd><p>Display the V value at the 10% percentile within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">VAVG</samp></dt>
- <dd><p>Display the average V value within the input frame. Expressed in range of
- [0-255].
- </p>
- </dd>
- <dt><samp class="option">VHIGH</samp></dt>
- <dd><p>Display the V value at the 90% percentile within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">VMAX</samp></dt>
- <dd><p>Display the maximum V value contained within the input frame. Expressed in
- range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">SATMIN</samp></dt>
- <dd><p>Display the minimal saturation value contained within the input frame.
- Expressed in range of [0-~181.02].
- </p>
- </dd>
- <dt><samp class="option">SATLOW</samp></dt>
- <dd><p>Display the saturation value at the 10% percentile within the input frame.
- Expressed in range of [0-~181.02].
- </p>
- </dd>
- <dt><samp class="option">SATAVG</samp></dt>
- <dd><p>Display the average saturation value within the input frame. Expressed in range
- of [0-~181.02].
- </p>
- </dd>
- <dt><samp class="option">SATHIGH</samp></dt>
- <dd><p>Display the saturation value at the 90% percentile within the input frame.
- Expressed in range of [0-~181.02].
- </p>
- </dd>
- <dt><samp class="option">SATMAX</samp></dt>
- <dd><p>Display the maximum saturation value contained within the input frame.
- Expressed in range of [0-~181.02].
- </p>
- </dd>
- <dt><samp class="option">HUEMED</samp></dt>
- <dd><p>Display the median value for hue within the input frame. Expressed in range of
- [0-360].
- </p>
- </dd>
- <dt><samp class="option">HUEAVG</samp></dt>
- <dd><p>Display the average value for hue within the input frame. Expressed in range of
- [0-360].
- </p>
- </dd>
- <dt><samp class="option">YDIF</samp></dt>
- <dd><p>Display the average of sample value difference between all values of the Y
- plane in the current frame and corresponding values of the previous input frame.
- Expressed in range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">UDIF</samp></dt>
- <dd><p>Display the average of sample value difference between all values of the U
- plane in the current frame and corresponding values of the previous input frame.
- Expressed in range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">VDIF</samp></dt>
- <dd><p>Display the average of sample value difference between all values of the V
- plane in the current frame and corresponding values of the previous input frame.
- Expressed in range of [0-255].
- </p>
- </dd>
- <dt><samp class="option">YBITDEPTH</samp></dt>
- <dd><p>Display bit depth of Y plane in current frame.
- Expressed in range of [0-16].
- </p>
- </dd>
- <dt><samp class="option">UBITDEPTH</samp></dt>
- <dd><p>Display bit depth of U plane in current frame.
- Expressed in range of [0-16].
- </p>
- </dd>
- <dt><samp class="option">VBITDEPTH</samp></dt>
- <dd><p>Display bit depth of V plane in current frame.
- Expressed in range of [0-16].
- </p></dd>
- </dl>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">stat</samp></dt>
- <dt><samp class="option">out</samp></dt>
- <dd>
- <p><samp class="option">stat</samp> specify an additional form of image analysis.
- <samp class="option">out</samp> output video with the specified type of pixel highlighted.
- </p>
- <p>Both options accept the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">tout</samp>’</dt>
- <dd><p>Identify <var class="var">temporal outliers</var> pixels. A <var class="var">temporal outlier</var> is a pixel
- unlike the neighboring pixels of the same field. Examples of temporal outliers
- include the results of video dropouts, head clogs, or tape tracking issues.
- </p>
- </dd>
- <dt>‘<samp class="samp">vrep</samp>’</dt>
- <dd><p>Identify <var class="var">vertical line repetition</var>. Vertical line repetition includes
- similar rows of pixels within a frame. In born-digital video vertical line
- repetition is common, but this pattern is uncommon in video digitized from an
- analog source. When it occurs in video that results from the digitization of an
- analog source it can indicate concealment from a dropout compensator.
- </p>
- </dd>
- <dt>‘<samp class="samp">brng</samp>’</dt>
- <dd><p>Identify pixels that fall outside of legal broadcast range.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">color, c</samp></dt>
- <dd><p>Set the highlight color for the <samp class="option">out</samp> option. The default color is
- yellow.
- </p></dd>
- </dl>
- <a name="Examples-164"></a>
- <h4 class="subsection">39.230.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-164" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-164" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Output data of various video metrics:
- <div class="example">
- <pre class="example-preformatted">ffprobe -f lavfi movie=example.mov,signalstats="stat=tout+vrep+brng" -show_frames
- </pre></div>
- </li><li>Output specific data about the minimum and maximum values of the Y plane per frame:
- <div class="example">
- <pre class="example-preformatted">ffprobe -f lavfi movie=example.mov,signalstats -show_entries frame_tags=lavfi.signalstats.YMAX,lavfi.signalstats.YMIN
- </pre></div>
- </li><li>Playback video while highlighting pixels that are outside of broadcast range in red.
- <div class="example">
- <pre class="example-preformatted">ffplay example.mov -vf signalstats="out=brng:color=red"
- </pre></div>
- </li><li>Playback video with signalstats metadata drawn over the frame.
- <div class="example">
- <pre class="example-preformatted">ffplay example.mov -vf signalstats=stat=brng+vrep+tout,drawtext=fontfile=FreeSerif.ttf:textfile=signalstat_drawtext.txt
- </pre></div>
- <p>The contents of signalstat_drawtext.txt used in the command are:
- </p><div class="example">
- <pre class="example-preformatted">time %{pts:hms}
- Y (%{metadata:lavfi.signalstats.YMIN}-%{metadata:lavfi.signalstats.YMAX})
- U (%{metadata:lavfi.signalstats.UMIN}-%{metadata:lavfi.signalstats.UMAX})
- V (%{metadata:lavfi.signalstats.VMIN}-%{metadata:lavfi.signalstats.VMAX})
- saturation maximum: %{metadata:lavfi.signalstats.SATMAX}
- </pre></div>
- </li></ul>
- <a class="anchor" id="signature"></a><a name="signature-1"></a>
- <h3 class="section">39.231 signature<span class="pull-right"><a class="anchor hidden-xs" href="#signature-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-signature-1" aria-hidden="true">TOC</a></span></h3>
- <p>Calculates the MPEG-7 Video Signature. The filter can handle more than one
- input. In this case the matching between the inputs can be calculated additionally.
- The filter always passes through the first input. The signature of each stream can
- be written into a file.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">detectmode</samp></dt>
- <dd><p>Enable or disable the matching process.
- </p>
- <p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">off</samp>’</dt>
- <dd><p>Disable the calculation of a matching (default).
- </p></dd>
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>Calculate the matching for the whole video and output whether the whole video
- matches or only parts.
- </p></dd>
- <dt>‘<samp class="samp">fast</samp>’</dt>
- <dd><p>Calculate only until a matching is found or the video ends. Should be faster in
- some cases.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">nb_inputs</samp></dt>
- <dd><p>Set the number of inputs. The option value must be a non negative integer.
- Default value is 1.
- </p>
- </dd>
- <dt><samp class="option">filename</samp></dt>
- <dd><p>Set the path to which the output is written. If there is more than one input,
- the path must be a prototype, i.e. must contain %d or %0nd (where n is a positive
- integer), that will be replaced with the input number. If no filename is
- specified, no output will be written. This is the default.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Choose the output format.
- </p>
- <p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">binary</samp>’</dt>
- <dd><p>Use the specified binary representation (default).
- </p></dd>
- <dt>‘<samp class="samp">xml</samp>’</dt>
- <dd><p>Use the specified xml representation.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">th_d</samp></dt>
- <dd><p>Set threshold to detect one word as similar. The option value must be an integer
- greater than zero. The default value is 9000.
- </p>
- </dd>
- <dt><samp class="option">th_dc</samp></dt>
- <dd><p>Set threshold to detect all words as similar. The option value must be an integer
- greater than zero. The default value is 60000.
- </p>
- </dd>
- <dt><samp class="option">th_xh</samp></dt>
- <dd><p>Set threshold to detect frames as similar. The option value must be an integer
- greater than zero. The default value is 116.
- </p>
- </dd>
- <dt><samp class="option">th_di</samp></dt>
- <dd><p>Set the minimum length of a sequence in frames to recognize it as matching
- sequence. The option value must be a non negative integer value.
- The default value is 0.
- </p>
- </dd>
- <dt><samp class="option">th_it</samp></dt>
- <dd><p>Set the minimum relation, that matching frames to all frames must have.
- The option value must be a double value between 0 and 1. The default value is 0.5.
- </p></dd>
- </dl>
- <a name="Examples-165"></a>
- <h4 class="subsection">39.231.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-165" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-165" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>To calculate the signature of an input video and store it in signature.bin:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv -vf signature=filename=signature.bin -map 0:v -f null -
- </pre></div>
- </li><li>To detect whether two videos match and store the signatures in XML format in
- signature0.xml and signature1.xml:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0:v][1:v] signature=nb_inputs=2:detectmode=full:format=xml:filename=signature%d.xml" -map :v -f null -
- </pre></div>
- </li></ul>
- <a class="anchor" id="siti"></a><a name="siti-1"></a>
- <h3 class="section">39.232 siti<span class="pull-right"><a class="anchor hidden-xs" href="#siti-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-siti-1" aria-hidden="true">TOC</a></span></h3>
- <p>Calculate Spatial Information (SI) and Temporal Information (TI) scores for a video,
- as defined in ITU-T Rec. P.910 (11/21): Subjective video quality assessment methods
- for multimedia applications. Available PDF at <a class="url" href="https://www.itu.int/rec/T-REC-P.910-202111-S/en">https://www.itu.int/rec/T-REC-P.910-202111-S/en</a>.
- Note that this is a legacy implementation that corresponds to a superseded recommendation.
- Refer to ITU-T Rec. P.910 (07/22) for the latest version: <a class="url" href="https://www.itu.int/rec/T-REC-P.910-202207-I/en">https://www.itu.int/rec/T-REC-P.910-202207-I/en</a>
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">print_summary</samp></dt>
- <dd><p>If set to 1, Summary statistics will be printed to the console. Default 0.
- </p></dd>
- </dl>
- <a name="Examples-166"></a>
- <h4 class="subsection">39.232.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-166" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-166" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>To calculate SI/TI metrics and print summary:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mp4 -vf siti=print_summary=1 -f null -
- </pre></div>
- </li></ul>
- <a class="anchor" id="smartblur"></a><a name="smartblur-1"></a>
- <h3 class="section">39.233 smartblur<span class="pull-right"><a class="anchor hidden-xs" href="#smartblur-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-smartblur-1" aria-hidden="true">TOC</a></span></h3>
- <p>Blur the input video without impacting the outlines.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_radius, lr</samp></dt>
- <dd><p>Set the luma radius. The option value must be a float number in
- the range [0.1,5.0] that specifies the variance of the gaussian filter
- used to blur the image (slower if larger). Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">luma_strength, ls</samp></dt>
- <dd><p>Set the luma strength. The option value must be a float number
- in the range [-1.0,1.0] that configures the blurring. A value included
- in [0.0,1.0] will blur the image whereas a value included in
- [-1.0,0.0] will sharpen the image. Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">luma_threshold, lt</samp></dt>
- <dd><p>Set the luma threshold used as a coefficient to determine
- whether a pixel should be blurred or not. The option value must be an
- integer in the range [-30,30]. A value of 0 will filter all the image,
- a value included in [0,30] will filter flat areas and a value included
- in [-30,0] will filter edges. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">chroma_radius, cr</samp></dt>
- <dd><p>Set the chroma radius. The option value must be a float number in
- the range [0.1,5.0] that specifies the variance of the gaussian filter
- used to blur the image (slower if larger). Default value is <samp class="option">luma_radius</samp>.
- </p>
- </dd>
- <dt><samp class="option">chroma_strength, cs</samp></dt>
- <dd><p>Set the chroma strength. The option value must be a float number
- in the range [-1.0,1.0] that configures the blurring. A value included
- in [0.0,1.0] will blur the image whereas a value included in
- [-1.0,0.0] will sharpen the image. Default value is <samp class="option">luma_strength</samp>.
- </p>
- </dd>
- <dt><samp class="option">chroma_threshold, ct</samp></dt>
- <dd><p>Set the chroma threshold used as a coefficient to determine
- whether a pixel should be blurred or not. The option value must be an
- integer in the range [-30,30]. A value of 0 will filter all the image,
- a value included in [0,30] will filter flat areas and a value included
- in [-30,0] will filter edges. Default value is <samp class="option">luma_threshold</samp>.
- </p>
- </dd>
- <dt><samp class="option">alpha_radius, ar</samp></dt>
- <dd><p>Set the alpha radius. The option value must be a float number in
- the range [0.1,5.0] that specifies the variance of the gaussian filter
- used to blur the image (slower if larger). Default value is <samp class="option">luma_radius</samp>.
- </p>
- </dd>
- <dt><samp class="option">alpha_strength, as</samp></dt>
- <dd><p>Set the alpha strength. The option value must be a float number
- in the range [-1.0,1.0] that configures the blurring. A value included
- in [0.0,1.0] will blur the image whereas a value included in
- [-1.0,0.0] will sharpen the image. Default value is <samp class="option">luma_strength</samp>.
- </p>
- </dd>
- <dt><samp class="option">alpha_threshold, at</samp></dt>
- <dd><p>Set the alpha threshold used as a coefficient to determine
- whether a pixel should be blurred or not. The option value must be an
- integer in the range [-30,30]. A value of 0 will filter all the image,
- a value included in [0,30] will filter flat areas and a value included
- in [-30,0] will filter edges. Default value is <samp class="option">luma_threshold</samp>.
- </p></dd>
- </dl>
- <p>If a chroma or alpha option is not explicitly set, the corresponding luma value
- is set.
- </p>
- <a name="sobel"></a>
- <h3 class="section">39.234 sobel<span class="pull-right"><a class="anchor hidden-xs" href="#sobel" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sobel" aria-hidden="true">TOC</a></span></h3>
- <p>Apply sobel operator to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- </p></dd>
- </dl>
- <a name="Commands-142"></a>
- <h4 class="subsection">39.234.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-142" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-142" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a class="anchor" id="spp"></a><a name="spp-1"></a>
- <h3 class="section">39.235 spp<span class="pull-right"><a class="anchor hidden-xs" href="#spp-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-spp-1" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a simple postprocessing filter that compresses and decompresses the image
- at several (or - in the case of <samp class="option">quality</samp> level <code class="code">6</code> - all) shifts
- and average the results.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">quality</samp></dt>
- <dd><p>Set quality. This option defines the number of levels for averaging. It accepts
- an integer in the range 0-6. If set to <code class="code">0</code>, the filter will have no
- effect. A value of <code class="code">6</code> means the higher quality. For each increment of
- that value the speed drops by a factor of approximately 2. Default value is
- <code class="code">3</code>.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Force a constant quantization parameter. If not set, the filter will use the QP
- from the video stream (if available).
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set thresholding mode. Available modes are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">hard</samp>’</dt>
- <dd><p>Set hard thresholding (default).
- </p></dd>
- <dt>‘<samp class="samp">soft</samp>’</dt>
- <dd><p>Set soft thresholding (better de-ringing effect, but likely blurrier).
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">use_bframe_qp</samp></dt>
- <dd><p>Enable the use of the QP from the B-Frames if set to <code class="code">1</code>. Using this
- option may cause flicker since the B-Frames have often larger QP. Default is
- <code class="code">0</code> (not enabled).
- </p></dd>
- </dl>
- <a name="Commands-143"></a>
- <h4 class="subsection">39.235.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-143" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-143" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">quality, level</samp></dt>
- <dd><p>Set quality level. The value <code class="code">max</code> can be used to set the maximum level,
- currently <code class="code">6</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="sr"></a><a name="sr-1"></a>
- <h3 class="section">39.236 sr<span class="pull-right"><a class="anchor hidden-xs" href="#sr-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sr-1" aria-hidden="true">TOC</a></span></h3>
- <p>Scale the input by applying one of the super-resolution methods based on
- convolutional neural networks. Supported models:
- </p>
- <ul class="itemize mark-bullet">
- <li>Super-Resolution Convolutional Neural Network model (SRCNN).
- See <a class="url" href="https://arxiv.org/abs/1501.00092">https://arxiv.org/abs/1501.00092</a>.
- </li><li>Efficient Sub-Pixel Convolutional Neural Network model (ESPCN).
- See <a class="url" href="https://arxiv.org/abs/1609.05158">https://arxiv.org/abs/1609.05158</a>.
- </li></ul>
- <p>Training scripts as well as scripts for model file (.pb) saving can be found at
- <a class="url" href="https://github.com/XueweiMeng/sr/tree/sr_dnn_native">https://github.com/XueweiMeng/sr/tree/sr_dnn_native</a>. Original repository
- is at <a class="url" href="https://github.com/HighVoltageRocknRoll/sr.git">https://github.com/HighVoltageRocknRoll/sr.git</a>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dnn_backend</samp></dt>
- <dd><p>Specify which DNN backend to use for model loading and execution. This option accepts
- the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">tensorflow</samp>’</dt>
- <dd><p>TensorFlow backend. To enable this backend you
- need to install the TensorFlow for C library (see
- <a class="url" href="https://www.tensorflow.org/install/lang_c">https://www.tensorflow.org/install/lang_c</a>) and configure FFmpeg with
- <code class="code">--enable-libtensorflow</code>
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">model</samp></dt>
- <dd><p>Set path to model file specifying network architecture and its parameters.
- Note that different backends use different file formats. TensorFlow, OpenVINO backend
- can load files for only its format.
- </p>
- </dd>
- <dt><samp class="option">scale_factor</samp></dt>
- <dd><p>Set scale factor for SRCNN model. Allowed values are <code class="code">2</code>, <code class="code">3</code> and <code class="code">4</code>.
- Default value is <code class="code">2</code>. Scale factor is necessary for SRCNN model, because it accepts
- input upscaled using bicubic upscaling with proper scale factor.
- </p></dd>
- </dl>
- <p>To get full functionality (such as async execution), please use the <a class="ref" href="#dnn_005fprocessing">dnn_processing</a> filter.
- </p>
- <a class="anchor" id="sr_005famf"></a><a name="sr_005famf-1"></a>
- <h3 class="section">39.237 sr_amf<span class="pull-right"><a class="anchor hidden-xs" href="#sr_005famf-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sr_005famf-1" aria-hidden="true">TOC</a></span></h3>
- <p>Upscale (size increasing) for the input video using AMD Advanced Media Framework library for hardware acceleration.
- Use advanced algorithms for upscaling with higher output quality.
- Setting the output width and height works in the same way as for the <a class="ref" href="#scale">scale</a> filter.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the output video dimension expression. Default value is the input dimension.
- </p>
- <p>Allows for the same expressions as the <a class="ref" href="#scale">scale</a> filter.
- </p>
- </dd>
- <dt><samp class="option">algorithm</samp></dt>
- <dd><p>Sets the algorithm used for scaling:
- </p>
- <dl class="table">
- <dt><var class="var">bilinear</var></dt>
- <dd><p>Bilinear
- </p>
- </dd>
- <dt><var class="var">bicubic</var></dt>
- <dd><p>Bicubic
- </p>
- </dd>
- <dt><var class="var">sr1-0</var></dt>
- <dd><p>Video SR1.0
- This is a default value
- </p>
- </dd>
- <dt><var class="var">point</var></dt>
- <dd><p>Point
- </p>
- </dd>
- <dt><var class="var">sr1-1</var></dt>
- <dd><p>Video SR1.1
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">sharpness</samp></dt>
- <dd><p>Control hq scaler sharpening. The value is a float in the range of [0.0, 2.0]
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Controls the output pixel format. By default, or if none is specified, the input
- pixel format is used.
- </p>
- </dd>
- <dt><samp class="option">keep-ratio</samp></dt>
- <dd><p>Force the scaler to keep the aspect ratio of the input image when the output size has a different aspect ratio.
- Default value is false.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>Specifies whether the output image outside the region of interest,
- which does not fill the entire output surface should be filled with a solid color.
- </p>
- </dd>
- </dl>
- <a name="Examples-167"></a>
- <h4 class="subsection">39.237.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-167" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-167" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Scale input to 720p, keeping aspect ratio and ensuring the output is yuv420p.
- <div class="example">
- <pre class="example-preformatted">sr_amf=-2:720:format=yuv420p
- </pre></div>
- </li><li>Upscale to 4K with algorithm video SR1.1.
- <div class="example">
- <pre class="example-preformatted">sr_amf=4096:2160:algorithm=sr1-1
- </pre></div>
- </li></ul>
- <a name="ssim"></a>
- <h3 class="section">39.238 ssim<span class="pull-right"><a class="anchor hidden-xs" href="#ssim" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ssim" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the SSIM (Structural SImilarity Metric) between two input videos.
- </p>
- <p>This filter takes in input two input videos, the first input is
- considered the "main" source and is passed unchanged to the
- output. The second input is used as a "reference" video for computing
- the SSIM.
- </p>
- <p>Both video inputs must have the same resolution and pixel format for
- this filter to work correctly. Also it assumes that both inputs
- have the same number of frames, which are compared one by one.
- </p>
- <p>The filter stores the calculated SSIM of each frame.
- </p>
- <p>The description of the accepted parameters follows.
- </p>
- <dl class="table">
- <dt><samp class="option">stats_file, f</samp></dt>
- <dd><p>If specified the filter will use the named file to save the SSIM of
- each individual frame. When filename equals "-" the data is sent to
- standard output.
- </p></dd>
- </dl>
- <p>The file printed if <var class="var">stats_file</var> is selected, contains a sequence of
- key/value pairs of the form <var class="var">key</var>:<var class="var">value</var> for each compared
- couple of frames.
- </p>
- <p>A description of each shown parameter follows:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>sequential number of the input frame, starting from 1
- </p>
- </dd>
- <dt><samp class="option">Y, U, V, R, G, B</samp></dt>
- <dd><p>SSIM of the compared frames for the component specified by the suffix.
- </p>
- </dd>
- <dt><samp class="option">All</samp></dt>
- <dd><p>SSIM of the compared frames for the whole frame.
- </p>
- </dd>
- <dt><samp class="option">dB</samp></dt>
- <dd><p>Same as above but in dB representation.
- </p></dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="Examples-168"></a>
- <h4 class="subsection">39.238.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-168" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-168" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>For example:
- <div class="example">
- <pre class="example-preformatted">movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
- [main][ref] ssim="stats_file=stats.log" [out]
- </pre></div>
- <p>On this example the input file being processed is compared with the
- reference file <samp class="file">ref_movie.mpg</samp>. The SSIM of each individual frame
- is stored in <samp class="file">stats.log</samp>.
- </p>
- </li><li>Another example with both psnr and ssim at same time:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mpg -lavfi "ssim;[0:v][1:v]psnr" -f null -
- </pre></div>
- </li><li>Another example with different containers:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" -f null -
- </pre></div>
- </li></ul>
- <a name="stereo3d"></a>
- <h3 class="section">39.239 stereo3d<span class="pull-right"><a class="anchor hidden-xs" href="#stereo3d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-stereo3d" aria-hidden="true">TOC</a></span></h3>
- <p>Convert between different stereoscopic image formats.
- </p>
- <p>The filters accept the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">in</samp></dt>
- <dd><p>Set stereoscopic image format of input.
- </p>
- <p>Available values for input image formats are:
- </p><dl class="table">
- <dt>‘<samp class="samp">sbsl</samp>’</dt>
- <dd><p>side by side parallel (left eye left, right eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">sbsr</samp>’</dt>
- <dd><p>side by side crosseye (right eye left, left eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">sbs2l</samp>’</dt>
- <dd><p>side by side parallel with half width resolution
- (left eye left, right eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">sbs2r</samp>’</dt>
- <dd><p>side by side crosseye with half width resolution
- (right eye left, left eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">abl</samp>’</dt>
- <dt>‘<samp class="samp">tbl</samp>’</dt>
- <dd><p>above-below (left eye above, right eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">abr</samp>’</dt>
- <dt>‘<samp class="samp">tbr</samp>’</dt>
- <dd><p>above-below (right eye above, left eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">ab2l</samp>’</dt>
- <dt>‘<samp class="samp">tb2l</samp>’</dt>
- <dd><p>above-below with half height resolution
- (left eye above, right eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">ab2r</samp>’</dt>
- <dt>‘<samp class="samp">tb2r</samp>’</dt>
- <dd><p>above-below with half height resolution
- (right eye above, left eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">al</samp>’</dt>
- <dd><p>alternating frames (left eye first, right eye second)
- </p>
- </dd>
- <dt>‘<samp class="samp">ar</samp>’</dt>
- <dd><p>alternating frames (right eye first, left eye second)
- </p>
- </dd>
- <dt>‘<samp class="samp">irl</samp>’</dt>
- <dd><p>interleaved rows (left eye has top row, right eye starts on next row)
- </p>
- </dd>
- <dt>‘<samp class="samp">irr</samp>’</dt>
- <dd><p>interleaved rows (right eye has top row, left eye starts on next row)
- </p>
- </dd>
- <dt>‘<samp class="samp">icl</samp>’</dt>
- <dd><p>interleaved columns, left eye first
- </p>
- </dd>
- <dt>‘<samp class="samp">icr</samp>’</dt>
- <dd><p>interleaved columns, right eye first
- </p>
- <p>Default value is ‘<samp class="samp">sbsl</samp>’.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">out</samp></dt>
- <dd><p>Set stereoscopic image format of output.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">sbsl</samp>’</dt>
- <dd><p>side by side parallel (left eye left, right eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">sbsr</samp>’</dt>
- <dd><p>side by side crosseye (right eye left, left eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">sbs2l</samp>’</dt>
- <dd><p>side by side parallel with half width resolution
- (left eye left, right eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">sbs2r</samp>’</dt>
- <dd><p>side by side crosseye with half width resolution
- (right eye left, left eye right)
- </p>
- </dd>
- <dt>‘<samp class="samp">abl</samp>’</dt>
- <dt>‘<samp class="samp">tbl</samp>’</dt>
- <dd><p>above-below (left eye above, right eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">abr</samp>’</dt>
- <dt>‘<samp class="samp">tbr</samp>’</dt>
- <dd><p>above-below (right eye above, left eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">ab2l</samp>’</dt>
- <dt>‘<samp class="samp">tb2l</samp>’</dt>
- <dd><p>above-below with half height resolution
- (left eye above, right eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">ab2r</samp>’</dt>
- <dt>‘<samp class="samp">tb2r</samp>’</dt>
- <dd><p>above-below with half height resolution
- (right eye above, left eye below)
- </p>
- </dd>
- <dt>‘<samp class="samp">al</samp>’</dt>
- <dd><p>alternating frames (left eye first, right eye second)
- </p>
- </dd>
- <dt>‘<samp class="samp">ar</samp>’</dt>
- <dd><p>alternating frames (right eye first, left eye second)
- </p>
- </dd>
- <dt>‘<samp class="samp">irl</samp>’</dt>
- <dd><p>interleaved rows (left eye has top row, right eye starts on next row)
- </p>
- </dd>
- <dt>‘<samp class="samp">irr</samp>’</dt>
- <dd><p>interleaved rows (right eye has top row, left eye starts on next row)
- </p>
- </dd>
- <dt>‘<samp class="samp">arbg</samp>’</dt>
- <dd><p>anaglyph red/blue gray
- (red filter on left eye, blue filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">argg</samp>’</dt>
- <dd><p>anaglyph red/green gray
- (red filter on left eye, green filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">arcg</samp>’</dt>
- <dd><p>anaglyph red/cyan gray
- (red filter on left eye, cyan filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">arch</samp>’</dt>
- <dd><p>anaglyph red/cyan half colored
- (red filter on left eye, cyan filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">arcc</samp>’</dt>
- <dd><p>anaglyph red/cyan color
- (red filter on left eye, cyan filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">arcd</samp>’</dt>
- <dd><p>anaglyph red/cyan color optimized with the least squares projection of dubois
- (red filter on left eye, cyan filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">agmg</samp>’</dt>
- <dd><p>anaglyph green/magenta gray
- (green filter on left eye, magenta filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">agmh</samp>’</dt>
- <dd><p>anaglyph green/magenta half colored
- (green filter on left eye, magenta filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">agmc</samp>’</dt>
- <dd><p>anaglyph green/magenta colored
- (green filter on left eye, magenta filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">agmd</samp>’</dt>
- <dd><p>anaglyph green/magenta color optimized with the least squares projection of dubois
- (green filter on left eye, magenta filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">aybg</samp>’</dt>
- <dd><p>anaglyph yellow/blue gray
- (yellow filter on left eye, blue filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">aybh</samp>’</dt>
- <dd><p>anaglyph yellow/blue half colored
- (yellow filter on left eye, blue filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">aybc</samp>’</dt>
- <dd><p>anaglyph yellow/blue colored
- (yellow filter on left eye, blue filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">aybd</samp>’</dt>
- <dd><p>anaglyph yellow/blue color optimized with the least squares projection of dubois
- (yellow filter on left eye, blue filter on right eye)
- </p>
- </dd>
- <dt>‘<samp class="samp">ml</samp>’</dt>
- <dd><p>mono output (left eye only)
- </p>
- </dd>
- <dt>‘<samp class="samp">mr</samp>’</dt>
- <dd><p>mono output (right eye only)
- </p>
- </dd>
- <dt>‘<samp class="samp">chl</samp>’</dt>
- <dd><p>checkerboard, left eye first
- </p>
- </dd>
- <dt>‘<samp class="samp">chr</samp>’</dt>
- <dd><p>checkerboard, right eye first
- </p>
- </dd>
- <dt>‘<samp class="samp">icl</samp>’</dt>
- <dd><p>interleaved columns, left eye first
- </p>
- </dd>
- <dt>‘<samp class="samp">icr</samp>’</dt>
- <dd><p>interleaved columns, right eye first
- </p>
- </dd>
- <dt>‘<samp class="samp">hdmi</samp>’</dt>
- <dd><p>HDMI frame pack
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">arcd</samp>’.
- </p></dd>
- </dl>
- <a name="Examples-169"></a>
- <h4 class="subsection">39.239.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-169" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-169" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert input video from side by side parallel to anaglyph yellow/blue dubois:
- <div class="example">
- <pre class="example-preformatted">stereo3d=sbsl:aybd
- </pre></div>
- </li><li>Convert input video from above below (left eye above, right eye below) to side by side crosseye.
- <div class="example">
- <pre class="example-preformatted">stereo3d=abl:sbsr
- </pre></div>
- </li></ul>
- <a name="streamselect_002c-astreamselect"></a>
- <h3 class="section">39.240 streamselect, astreamselect<span class="pull-right"><a class="anchor hidden-xs" href="#streamselect_002c-astreamselect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-streamselect_002c-astreamselect" aria-hidden="true">TOC</a></span></h3>
- <p>Select video or audio streams.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set number of inputs. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">map</samp></dt>
- <dd><p>Set input indexes to remap to outputs.
- </p></dd>
- </dl>
- <a name="Commands-144"></a>
- <h4 class="subsection">39.240.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-144" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-144" aria-hidden="true">TOC</a></span></h4>
- <p>The <code class="code">streamselect</code> and <code class="code">astreamselect</code> filter supports the following
- commands:
- </p>
- <dl class="table">
- <dt><samp class="option">map</samp></dt>
- <dd><p>Set input indexes to remap to outputs.
- </p></dd>
- </dl>
- <a name="Examples-170"></a>
- <h4 class="subsection">39.240.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-170" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-170" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Select first 5 seconds 1st stream and rest of time 2nd stream:
- <div class="example">
- <pre class="example-preformatted">sendcmd='5.0 streamselect map 1',streamselect=inputs=2:map=0
- </pre></div>
- </li><li>Same as above, but for audio:
- <div class="example">
- <pre class="example-preformatted">asendcmd='5.0 astreamselect map 1',astreamselect=inputs=2:map=0
- </pre></div>
- </li></ul>
- <a class="anchor" id="subtitles"></a><a name="subtitles-1"></a>
- <h3 class="section">39.241 subtitles<span class="pull-right"><a class="anchor hidden-xs" href="#subtitles-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-subtitles-1" aria-hidden="true">TOC</a></span></h3>
- <p>Draw subtitles on top of input video using the libass library.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-libass</code>. This filter also requires a build with libavcodec and
- libavformat to convert the passed subtitles file to ASS (Advanced Substation
- Alpha) subtitles format.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">filename, f</samp></dt>
- <dd><p>Set the filename of the subtitle file to read. It must be specified.
- </p>
- </dd>
- <dt><samp class="option">original_size</samp></dt>
- <dd><p>Specify the size of the original video, the video for which the ASS file
- was composed. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Due to a misdesign in ASS aspect ratio arithmetic, this is necessary to
- correctly scale the fonts if the aspect ratio has been changed.
- </p>
- </dd>
- <dt><samp class="option">fontsdir</samp></dt>
- <dd><p>Set a directory path containing fonts that can be used by the filter.
- These fonts will be used in addition to whatever the font provider uses.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>Process alpha channel, by default alpha channel is untouched.
- </p>
- </dd>
- <dt><samp class="option">charenc</samp></dt>
- <dd><p>Set subtitles input character encoding. <code class="code">subtitles</code> filter only. Only
- useful if not UTF-8.
- </p>
- </dd>
- <dt><samp class="option">stream_index, si</samp></dt>
- <dd><p>Set subtitles stream index. <code class="code">subtitles</code> filter only.
- </p>
- </dd>
- <dt><samp class="option">force_style</samp></dt>
- <dd><p>Override default style or script info parameters of the subtitles. It accepts a
- string containing ASS style format <code class="code">KEY=VALUE</code> couples separated by ",".
- </p>
- </dd>
- <dt><samp class="option">wrap_unicode</samp></dt>
- <dd><p>Break lines according to the Unicode Line Breaking Algorithm. Availability requires
- at least libass release 0.17.0 (or LIBASS_VERSION 0x01600010), <em class="emph">and</em> libass must
- have been built with libunibreak.
- </p>
- <p>The option is enabled by default except for native ASS.
- </p></dd>
- </dl>
- <p>If the first key is not specified, it is assumed that the first value
- specifies the <samp class="option">filename</samp>.
- </p>
- <p>For example, to render the file <samp class="file">sub.srt</samp> on top of the input
- video, use the command:
- </p><div class="example">
- <pre class="example-preformatted">subtitles=sub.srt
- </pre></div>
- <p>which is equivalent to:
- </p><div class="example">
- <pre class="example-preformatted">subtitles=filename=sub.srt
- </pre></div>
- <p>To render the default subtitles stream from file <samp class="file">video.mkv</samp>, use:
- </p><div class="example">
- <pre class="example-preformatted">subtitles=video.mkv
- </pre></div>
- <p>To render the second subtitles stream from that file, use:
- </p><div class="example">
- <pre class="example-preformatted">subtitles=video.mkv:si=1
- </pre></div>
- <p>To make the subtitles stream from <samp class="file">sub.srt</samp> appear in 80% transparent blue
- <code class="code">DejaVu Serif</code>, use:
- </p><div class="example">
- <pre class="example-preformatted">subtitles=sub.srt:force_style='Fontname=DejaVu Serif,PrimaryColour=&HCCFF0000'
- </pre></div>
- <a name="super2xsai"></a>
- <h3 class="section">39.242 super2xsai<span class="pull-right"><a class="anchor hidden-xs" href="#super2xsai" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-super2xsai" aria-hidden="true">TOC</a></span></h3>
- <p>Scale the input by 2x and smooth using the Super2xSaI (Scale and
- Interpolate) pixel art scaling algorithm.
- </p>
- <p>Useful for enlarging pixel art images without reducing sharpness.
- </p>
- <a name="swaprect"></a>
- <h3 class="section">39.243 swaprect<span class="pull-right"><a class="anchor hidden-xs" href="#swaprect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-swaprect" aria-hidden="true">TOC</a></span></h3>
- <p>Swap two rectangular objects in video.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dd><p>Set object width.
- </p>
- </dd>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set object height.
- </p>
- </dd>
- <dt><samp class="option">x1</samp></dt>
- <dd><p>Set 1st rect x coordinate.
- </p>
- </dd>
- <dt><samp class="option">y1</samp></dt>
- <dd><p>Set 1st rect y coordinate.
- </p>
- </dd>
- <dt><samp class="option">x2</samp></dt>
- <dd><p>Set 2nd rect x coordinate.
- </p>
- </dd>
- <dt><samp class="option">y2</samp></dt>
- <dd><p>Set 2nd rect y coordinate.
- </p>
- <p>All expressions are evaluated once for each frame.
- </p></dd>
- </dl>
- <p>The all options are expressions containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>same as <var class="var">w</var> / <var class="var">h</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">w</var> / <var class="var">h</var>) * <var class="var">sar</var>
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>The number of the input frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The timestamp expressed in seconds. It’s NAN if the input timestamp is unknown.
- </p>
- </dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>the position in the file of the input frame, NAN if unknown; deprecated,
- do not use
- </p></dd>
- </dl>
- <a name="Commands-145"></a>
- <h4 class="subsection">39.243.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-145" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-145" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="swapuv"></a>
- <h3 class="section">39.244 swapuv<span class="pull-right"><a class="anchor hidden-xs" href="#swapuv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-swapuv" aria-hidden="true">TOC</a></span></h3>
- <p>Swap U & V plane.
- </p>
- <a name="tblend"></a>
- <h3 class="section">39.245 tblend<span class="pull-right"><a class="anchor hidden-xs" href="#tblend" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tblend" aria-hidden="true">TOC</a></span></h3>
- <p>Blend successive video frames.
- </p>
- <p>See <a class="ref" href="#blend">blend</a>
- </p>
- <a name="telecine"></a>
- <h3 class="section">39.246 telecine<span class="pull-right"><a class="anchor hidden-xs" href="#telecine" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-telecine" aria-hidden="true">TOC</a></span></h3>
- <p>Apply telecine process to the video.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">first_field</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">top, t</samp>’</dt>
- <dd><p>top field first
- </p></dd>
- <dt>‘<samp class="samp">bottom, b</samp>’</dt>
- <dd><p>bottom field first
- The default value is <code class="code">top</code>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">pattern</samp></dt>
- <dd><p>A string of numbers representing the pulldown pattern you wish to apply.
- The default value is <code class="code">23</code>.
- </p></dd>
- </dl>
- <div class="example">
- <pre class="example-preformatted">Some typical patterns:
- NTSC output (30i):
- 27.5p: 32222
- 24p: 23 (classic)
- 24p: 2332 (preferred)
- 20p: 33
- 18p: 334
- 16p: 3444
- PAL output (25i):
- 27.5p: 12222
- 24p: 222222222223 ("Euro pulldown")
- 16.67p: 33
- 16p: 33333334
- </pre></div>
- <a name="thistogram"></a>
- <h3 class="section">39.247 thistogram<span class="pull-right"><a class="anchor hidden-xs" href="#thistogram" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-thistogram" aria-hidden="true">TOC</a></span></h3>
- <p>Compute and draw a color distribution histogram for the input video across time.
- </p>
- <p>Unlike <a class="ref" href="#histogram">histogram</a> video filter which only shows histogram of single input frame
- at certain time, this filter shows also past histograms of number of frames defined
- by <code class="code">width</code> option.
- </p>
- <p>The computed histogram is a representation of the color component
- distribution in an image.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dd><p>Set width of single color component output. Default value is <code class="code">0</code>.
- Value of <code class="code">0</code> means width will be picked from input video.
- This also set number of passed histograms to keep.
- Allowed range is [0, 8192].
- </p>
- </dd>
- <dt><samp class="option">display_mode, d</samp></dt>
- <dd><p>Set display mode.
- It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">stack</samp>’</dt>
- <dd><p>Per color component graphs are placed below each other.
- </p>
- </dd>
- <dt>‘<samp class="samp">parade</samp>’</dt>
- <dd><p>Per color component graphs are placed side by side.
- </p>
- </dd>
- <dt>‘<samp class="samp">overlay</samp>’</dt>
- <dd><p>Presents information identical to that in the <code class="code">parade</code>, except
- that the graphs representing color components are superimposed directly
- over one another.
- </p></dd>
- </dl>
- <p>Default is <code class="code">stack</code>.
- </p>
- </dd>
- <dt><samp class="option">levels_mode, m</samp></dt>
- <dd><p>Set mode. Can be either <code class="code">linear</code>, or <code class="code">logarithmic</code>.
- Default is <code class="code">linear</code>.
- </p>
- </dd>
- <dt><samp class="option">components, c</samp></dt>
- <dd><p>Set what color components to display.
- Default is <code class="code">7</code>.
- </p>
- </dd>
- <dt><samp class="option">bgopacity, b</samp></dt>
- <dd><p>Set background opacity. Default is <code class="code">0.9</code>.
- </p>
- </dd>
- <dt><samp class="option">envelope, e</samp></dt>
- <dd><p>Show envelope. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">ecolor, ec</samp></dt>
- <dd><p>Set envelope color. Default is <code class="code">gold</code>.
- </p>
- </dd>
- <dt><samp class="option">slide</samp></dt>
- <dd><p>Set slide mode.
- </p>
- <p>Available values for slide is:
- </p><dl class="table">
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Draw new frame when right border is reached.
- </p>
- </dd>
- <dt>‘<samp class="samp">replace</samp>’</dt>
- <dd><p>Replace old columns with new ones.
- </p>
- </dd>
- <dt>‘<samp class="samp">scroll</samp>’</dt>
- <dd><p>Scroll from right to left.
- </p>
- </dd>
- <dt>‘<samp class="samp">rscroll</samp>’</dt>
- <dd><p>Scroll from left to right.
- </p>
- </dd>
- <dt>‘<samp class="samp">picture</samp>’</dt>
- <dd><p>Draw single picture.
- </p></dd>
- </dl>
- <p>Default is <code class="code">replace</code>.
- </p></dd>
- </dl>
- <a name="threshold"></a>
- <h3 class="section">39.248 threshold<span class="pull-right"><a class="anchor hidden-xs" href="#threshold" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-threshold" aria-hidden="true">TOC</a></span></h3>
- <p>Apply threshold effect to video stream.
- </p>
- <p>This filter needs four video streams to perform thresholding.
- First stream is stream we are filtering.
- Second stream is holding threshold values, third stream is holding min values,
- and last, fourth stream is holding max values.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p></dd>
- </dl>
- <p>For example if first stream pixel’s component value is less then threshold value
- of pixel component from 2nd threshold stream, third stream value will picked,
- otherwise fourth stream pixel component value will be picked.
- </p>
- <p>Using color source filter one can perform various types of thresholding:
- </p>
- <a name="Commands-146"></a>
- <h4 class="subsection">39.248.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-146" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-146" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-171"></a>
- <h4 class="subsection">39.248.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-171" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-171" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Binary threshold, using gray color as threshold:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=black -f lavfi -i color=white -lavfi threshold output.avi
- </pre></div>
- </li><li>Inverted binary threshold, using gray color as threshold:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=white -f lavfi -i color=black -lavfi threshold output.avi
- </pre></div>
- </li><li>Truncate binary threshold, using gray color as threshold:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i 320x240.avi -f lavfi -i color=gray -i 320x240.avi -f lavfi -i color=gray -lavfi threshold output.avi
- </pre></div>
- </li><li>Threshold to zero, using gray color as threshold:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=white -i 320x240.avi -lavfi threshold output.avi
- </pre></div>
- </li><li>Inverted threshold to zero, using gray color as threshold:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i 320x240.avi -f lavfi -i color=gray -i 320x240.avi -f lavfi -i color=white -lavfi threshold output.avi
- </pre></div>
- </li></ul>
- <a name="thumbnail"></a>
- <h3 class="section">39.249 thumbnail<span class="pull-right"><a class="anchor hidden-xs" href="#thumbnail" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-thumbnail" aria-hidden="true">TOC</a></span></h3>
- <p>Select the most representative frame in a given sequence of consecutive frames.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the frames batch size to analyze; in a set of <var class="var">n</var> frames, the filter
- will pick one of them, and then handle the next batch of <var class="var">n</var> frames until
- the end. Default is <code class="code">100</code>.
- </p>
- </dd>
- <dt><samp class="option">log</samp></dt>
- <dd><p>Set the log level to display picked frame stats.
- Default is <code class="code">info</code>.
- </p></dd>
- </dl>
- <p>Since the filter keeps track of the whole frames sequence, a bigger <var class="var">n</var>
- value will result in a higher memory usage, so a high value is not recommended.
- </p>
- <a name="Examples-172"></a>
- <h4 class="subsection">39.249.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-172" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-172" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Extract one picture each 50 frames:
- <div class="example">
- <pre class="example-preformatted">thumbnail=50
- </pre></div>
- </li><li>Complete example of a thumbnail creation with <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png
- </pre></div>
- </li></ul>
- <a class="anchor" id="tile"></a><a name="tile-1"></a>
- <h3 class="section">39.250 tile<span class="pull-right"><a class="anchor hidden-xs" href="#tile-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tile-1" aria-hidden="true">TOC</a></span></h3>
- <p>Tile several successive frames together.
- </p>
- <p>The <a class="ref" href="#untile">untile</a> filter can do the reverse.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">layout</samp></dt>
- <dd><p>Set the grid size in the form <code class="code">COLUMNSxROWS</code>. Range is up to UINT_MAX cells.
- Default is <code class="code">6x5</code>.
- </p>
- </dd>
- <dt><samp class="option">nb_frames</samp></dt>
- <dd><p>Set the maximum number of frames to render in the given area. It must be less
- than or equal to <var class="var">w</var>x<var class="var">h</var>. The default value is <code class="code">0</code>, meaning all
- the area will be used.
- </p>
- </dd>
- <dt><samp class="option">margin</samp></dt>
- <dd><p>Set the outer border margin in pixels. Range is 0 to 1024. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">padding</samp></dt>
- <dd><p>Set the inner border thickness (i.e. the number of pixels between frames). For
- more advanced padding options (such as having different values for the edges),
- refer to the pad video filter. Range is 0 to 1024. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify the color of the unused area. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- The default value of <var class="var">color</var> is "black".
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set the number of frames to overlap when tiling several successive frames together.
- The value must be between <code class="code">0</code> and <var class="var">nb_frames - 1</var>. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">init_padding</samp></dt>
- <dd><p>Set the number of frames to initially be empty before displaying first output frame.
- This controls how soon will one get first output frame.
- The value must be between <code class="code">0</code> and <var class="var">nb_frames - 1</var>. Default is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="Examples-173"></a>
- <h4 class="subsection">39.250.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-173" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-173" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Produce 8x8 PNG tiles of all keyframes (<samp class="option">-skip_frame nokey</samp>) in a movie:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -skip_frame nokey -i file.avi -vf 'scale=128:72,tile=8x8' -an -vsync 0 keyframes%03d.png
- </pre></div>
- <p>The <samp class="option">-vsync 0</samp> is necessary to prevent <code class="command">ffmpeg</code> from
- duplicating each output frame to accommodate the originally detected frame
- rate.
- </p>
- </li><li>Display <code class="code">5</code> pictures in an area of <code class="code">3x2</code> frames,
- with <code class="code">7</code> pixels between them, and <code class="code">2</code> pixels of initial margin, using
- mixed flat and named options:
- <div class="example">
- <pre class="example-preformatted">tile=3x2:nb_frames=5:padding=7:margin=2
- </pre></div>
- </li></ul>
- <a name="tiltandshift"></a>
- <h3 class="section">39.251 tiltandshift<span class="pull-right"><a class="anchor hidden-xs" href="#tiltandshift" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tiltandshift" aria-hidden="true">TOC</a></span></h3>
- <p>Apply tilt-and-shift effect.
- </p>
- <p>What happens when you invert time and space?
- </p>
- <p>Normally a video is composed of several frames that represent a different
- instant of time and shows a scene that evolves in the space captured by the
- frame. This filter is the antipode of that concept, taking inspiration from
- tilt and shift photography.
- </p>
- <p>A filtered frame contains the whole timeline of events composing the sequence,
- and this is obtained by placing a slice of pixels from each frame into a single
- one. However, since there are no infinite-width frames, this is done up the
- width of the input frame, and a video is recomposed by shifting away one
- column for each subsequent frame. In order to map space to time, the filter
- tilts each input frame as well, so that motion is preserved. This is accomplished
- by progressively selecting a different column from each input frame.
- </p>
- <p>The end result is a sort of inverted parallax, so that far away objects move
- much faster that the ones in the front. The ideal conditions for this video
- effect are when there is either very little motion and the background is static,
- or when there is a lot of motion and a very wide depth of field (e.g. wide
- panorama, while moving on a train).
- </p>
- <p>The filter accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">tilt</samp></dt>
- <dd><p>Tilt video while shifting (default). When unset, video will be sliding a
- static image, composed of the first column of each frame.
- </p>
- </dd>
- <dt><samp class="option">start</samp></dt>
- <dd><p>What to do at the start of filtering (see below).
- </p>
- </dd>
- <dt><samp class="option">end</samp></dt>
- <dd><p>What to do at the end of filtering (see below).
- </p>
- </dd>
- <dt><samp class="option">hold</samp></dt>
- <dd><p>How many columns should pass through before start of filtering.
- </p>
- </dd>
- <dt><samp class="option">pad</samp></dt>
- <dd><p>How many columns should be inserted before end of filtering.
- </p>
- </dd>
- </dl>
- <p>Normally the filter shifts and tilts from the very first frame, and stops when
- the last one is received. However, before filtering starts, normal video may
- be preserved, so that the effect is slowly shifted in its place. Similarly,
- the last video frame may be reconstructed at the end. Alternatively it is
- possible to just start and end with black.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Filtering starts immediately and ends when the last frame is received.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>The first frames or the very last frame are kept intact during processing.
- </p>
- </dd>
- <dt>‘<samp class="samp">black</samp>’</dt>
- <dd><p>Black is padded at the beginning or at the end of filtering.
- </p>
- </dd>
- </dl>
- <a name="tinterlace"></a>
- <h3 class="section">39.252 tinterlace<span class="pull-right"><a class="anchor hidden-xs" href="#tinterlace" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tinterlace" aria-hidden="true">TOC</a></span></h3>
- <p>Perform various types of temporal field interlacing.
- </p>
- <p>Frames are counted starting from 1, so the first input frame is
- considered odd.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Specify the mode of the interlacing. This option can also be specified
- as a value alone. See below for a list of values for this option.
- </p>
- <p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">merge, 0</samp>’</dt>
- <dd><p>Move odd frames into the upper field, even into the lower field,
- generating a double height frame at half frame rate.
- </p><div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- Output:
- 11111 33333
- 22222 44444
- 11111 33333
- 22222 44444
- 11111 33333
- 22222 44444
- 11111 33333
- 22222 44444
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">drop_even, 1</samp>’</dt>
- <dd><p>Only output odd frames, even frames are dropped, generating a frame with
- unchanged height at half frame rate.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- Output:
- 11111 33333
- 11111 33333
- 11111 33333
- 11111 33333
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">drop_odd, 2</samp>’</dt>
- <dd><p>Only output even frames, odd frames are dropped, generating a frame with
- unchanged height at half frame rate.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- Output:
- 22222 44444
- 22222 44444
- 22222 44444
- 22222 44444
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">pad, 3</samp>’</dt>
- <dd><p>Expand each frame to full height, but pad alternate lines with black,
- generating a frame with double height at the same input frame rate.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- Output:
- 11111 ..... 33333 .....
- ..... 22222 ..... 44444
- 11111 ..... 33333 .....
- ..... 22222 ..... 44444
- 11111 ..... 33333 .....
- ..... 22222 ..... 44444
- 11111 ..... 33333 .....
- ..... 22222 ..... 44444
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">interleave_top, 4</samp>’</dt>
- <dd><p>Interleave the upper field from odd frames with the lower field from
- even frames, generating a frame with unchanged height at half frame rate.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111<- 22222 33333<- 44444
- 11111 22222<- 33333 44444<-
- 11111<- 22222 33333<- 44444
- 11111 22222<- 33333 44444<-
- Output:
- 11111 33333
- 22222 44444
- 11111 33333
- 22222 44444
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">interleave_bottom, 5</samp>’</dt>
- <dd><p>Interleave the lower field from odd frames with the upper field from
- even frames, generating a frame with unchanged height at half frame rate.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222<- 33333 44444<-
- 11111<- 22222 33333<- 44444
- 11111 22222<- 33333 44444<-
- 11111<- 22222 33333<- 44444
- Output:
- 22222 44444
- 11111 33333
- 22222 44444
- 11111 33333
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">interlacex2, 6</samp>’</dt>
- <dd><p>Double frame rate with unchanged height. Frames are inserted each
- containing the second temporal field from the previous input frame and
- the first temporal field from the next input frame. This mode relies on
- the top_field_first flag. Useful for interlaced video displays with no
- field synchronisation.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- Output:
- 11111 22222 22222 33333 33333 44444 44444
- 11111 11111 22222 22222 33333 33333 44444
- 11111 22222 22222 33333 33333 44444 44444
- 11111 11111 22222 22222 33333 33333 44444
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">mergex2, 7</samp>’</dt>
- <dd><p>Move odd frames into the upper field, even into the lower field,
- generating a double height frame at same frame rate.
- </p>
- <div class="example">
- <pre class="example-preformatted"> ------> time
- Input:
- Frame 1 Frame 2 Frame 3 Frame 4
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- 11111 22222 33333 44444
- Output:
- 11111 33333 33333 55555
- 22222 22222 44444 44444
- 11111 33333 33333 55555
- 22222 22222 44444 44444
- 11111 33333 33333 55555
- 22222 22222 44444 44444
- 11111 33333 33333 55555
- 22222 22222 44444 44444
- </pre></div>
- </dd>
- </dl>
- <p>Numeric values are deprecated but are accepted for backward
- compatibility reasons.
- </p>
- <p>Default mode is <code class="code">merge</code>.
- </p>
- </dd>
- <dt><samp class="option">flags</samp></dt>
- <dd><p>Specify flags influencing the filter process.
- </p>
- <p>Available value for <var class="var">flags</var> is:
- </p>
- <dl class="table">
- <dt><samp class="option">low_pass_filter, vlpf</samp></dt>
- <dd><p>Enable linear vertical low-pass filtering in the filter.
- Vertical low-pass filtering is required when creating an interlaced
- destination from a progressive source which contains high-frequency
- vertical detail. Filtering will reduce interlace ’twitter’ and Moire
- patterning.
- </p>
- </dd>
- <dt><samp class="option">complex_filter, cvlpf</samp></dt>
- <dd><p>Enable complex vertical low-pass filtering.
- This will slightly less reduce interlace ’twitter’ and Moire
- patterning but better retain detail and subjective sharpness impression.
- </p>
- </dd>
- <dt><samp class="option">bypass_il</samp></dt>
- <dd><p>Bypass already interlaced frames, only adjust the frame rate.
- </p></dd>
- </dl>
- <p>Vertical low-pass filtering and bypassing already interlaced frames can only be
- enabled for <samp class="option">mode</samp> <var class="var">interleave_top</var> and <var class="var">interleave_bottom</var>.
- </p>
- </dd>
- </dl>
- <a name="tmedian"></a>
- <h3 class="section">39.253 tmedian<span class="pull-right"><a class="anchor hidden-xs" href="#tmedian" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tmedian" aria-hidden="true">TOC</a></span></h3>
- <p>Pick median pixels from several successive input video frames.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set radius of median filter.
- Default is 1. Allowed range is from 1 to 127.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">15</code>, by which all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">percentile</samp></dt>
- <dd><p>Set median percentile. Default value is <code class="code">0.5</code>.
- Default value of <code class="code">0.5</code> will pick always median values, while <code class="code">0</code> will pick
- minimum values, and <code class="code">1</code> maximum values.
- </p></dd>
- </dl>
- <a name="Commands-147"></a>
- <h4 class="subsection">39.253.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-147" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-147" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports all above options as <a class="ref" href="#commands">commands</a>, excluding option <code class="code">radius</code>.
- </p>
- <a name="tmidequalizer"></a>
- <h3 class="section">39.254 tmidequalizer<span class="pull-right"><a class="anchor hidden-xs" href="#tmidequalizer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tmidequalizer" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Temporal Midway Video Equalization effect.
- </p>
- <p>Midway Video Equalization adjusts a sequence of video frames to have the same
- histograms, while maintaining their dynamics as much as possible. It’s
- useful for e.g. matching exposures from a video frames sequence.
- </p>
- <p>This filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">radius</samp></dt>
- <dd><p>Set filtering radius. Default is <code class="code">5</code>. Allowed range is from 1 to 127.
- </p>
- </dd>
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>Set filtering sigma. Default is <code class="code">0.5</code>. This controls strength of filtering.
- Setting this option to 0 effectively does nothing.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process. Default is <code class="code">15</code>, which is all available planes.
- </p></dd>
- </dl>
- <a name="tmix"></a>
- <h3 class="section">39.255 tmix<span class="pull-right"><a class="anchor hidden-xs" href="#tmix" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tmix" aria-hidden="true">TOC</a></span></h3>
- <p>Mix successive video frames.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">frames</samp></dt>
- <dd><p>The number of successive frames to mix. If unspecified, it defaults to 3.
- </p>
- </dd>
- <dt><samp class="option">weights</samp></dt>
- <dd><p>Specify weight of each input video frame.
- Each weight is separated by space. If number of weights is smaller than
- number of <var class="var">frames</var> last specified weight will be used for all remaining
- unset weights.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Specify scale, if it is set it will be multiplied with sum
- of each weight multiplied with pixel values to give final destination
- pixel value. By default <var class="var">scale</var> is auto scaled to sum of weights.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default is all. Allowed range is from 0 to 15.
- </p></dd>
- </dl>
- <a name="Examples-174"></a>
- <h4 class="subsection">39.255.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-174" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-174" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Average 7 successive frames:
- <div class="example">
- <pre class="example-preformatted">tmix=frames=7:weights="1 1 1 1 1 1 1"
- </pre></div>
- </li><li>Apply simple temporal convolution:
- <div class="example">
- <pre class="example-preformatted">tmix=frames=3:weights="-1 3 -1"
- </pre></div>
- </li><li>Similar as above but only showing temporal differences:
- <div class="example">
- <pre class="example-preformatted">tmix=frames=3:weights="-1 2 -1":scale=1
- </pre></div>
- </li></ul>
- <a name="Commands-148"></a>
- <h4 class="subsection">39.255.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-148" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-148" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">weights</samp></dt>
- <dt><samp class="option">scale</samp></dt>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Syntax is same as option with same name.
- </p></dd>
- </dl>
- <a class="anchor" id="tonemap"></a><a name="tonemap-1"></a>
- <h3 class="section">39.256 tonemap<span class="pull-right"><a class="anchor hidden-xs" href="#tonemap-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tonemap-1" aria-hidden="true">TOC</a></span></h3>
- <p>Tone map colors from different dynamic ranges.
- </p>
- <p>This filter expects data in single precision floating point, as it needs to
- operate on (and can output) out-of-range values. Another filter, such as
- <a class="ref" href="#zscale">zscale</a>, is needed to convert the resulting frame to a usable format.
- </p>
- <p>The tonemapping algorithms implemented only work on linear light, so input
- data should be linearized beforehand (and possibly correctly tagged).
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf zscale=transfer=linear,tonemap=clip,zscale=transfer=bt709,format=yuv420p OUTPUT
- </pre></div>
- <a name="Options-123"></a>
- <h4 class="subsection">39.256.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-123" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-123" aria-hidden="true">TOC</a></span></h4>
- <p>The filter accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">tonemap</samp></dt>
- <dd><p>Set the tone map algorithm to use.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">none</var></dt>
- <dd><p>Do not apply any tone map, only desaturate overbright pixels.
- </p>
- </dd>
- <dt><var class="var">clip</var></dt>
- <dd><p>Hard-clip any out-of-range values. Use it for perfect color accuracy for
- in-range values, while distorting out-of-range values.
- </p>
- </dd>
- <dt><var class="var">linear</var></dt>
- <dd><p>Stretch the entire reference gamut to a linear multiple of the display.
- </p>
- </dd>
- <dt><var class="var">gamma</var></dt>
- <dd><p>Fit a logarithmic transfer between the tone curves.
- </p>
- </dd>
- <dt><var class="var">reinhard</var></dt>
- <dd><p>Preserve overall image brightness with a simple curve, using nonlinear
- contrast, which results in flattening details and degrading color accuracy.
- </p>
- </dd>
- <dt><var class="var">hable</var></dt>
- <dd><p>Preserve both dark and bright details better than <var class="var">reinhard</var>, at the cost
- of slightly darkening everything. Use it when detail preservation is more
- important than color and brightness accuracy.
- </p>
- </dd>
- <dt><var class="var">mobius</var></dt>
- <dd><p>Smoothly map out-of-range values, while retaining contrast and colors for
- in-range material as much as possible. Use it when color accuracy is more
- important than detail preservation.
- </p></dd>
- </dl>
- <p>Default is none.
- </p>
- </dd>
- <dt><samp class="option">param</samp></dt>
- <dd><p>Tune the tone mapping algorithm.
- </p>
- <p>This affects the following algorithms:
- </p><dl class="table">
- <dt><var class="var">none</var></dt>
- <dd><p>Ignored.
- </p>
- </dd>
- <dt><var class="var">linear</var></dt>
- <dd><p>Specifies the scale factor to use while stretching.
- Default to 1.0.
- </p>
- </dd>
- <dt><var class="var">gamma</var></dt>
- <dd><p>Specifies the exponent of the function.
- Default to 1.8.
- </p>
- </dd>
- <dt><var class="var">clip</var></dt>
- <dd><p>Specify an extra linear coefficient to multiply into the signal before clipping.
- Default to 1.0.
- </p>
- </dd>
- <dt><var class="var">reinhard</var></dt>
- <dd><p>Specify the local contrast coefficient at the display peak.
- Default to 0.5, which means that in-gamut values will be about half as bright
- as when clipping.
- </p>
- </dd>
- <dt><var class="var">hable</var></dt>
- <dd><p>Ignored.
- </p>
- </dd>
- <dt><var class="var">mobius</var></dt>
- <dd><p>Specify the transition point from linear to mobius transform. Every value
- below this point is guaranteed to be mapped 1:1. The higher the value, the
- more accurate the result will be, at the cost of losing bright details.
- Default to 0.3, which due to the steep initial slope still preserves in-range
- colors fairly accurately.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">desat</samp></dt>
- <dd><p>Apply desaturation for highlights that exceed this level of brightness. The
- higher the parameter, the more color information will be preserved. This
- setting helps prevent unnaturally blown-out colors for super-highlights, by
- (smoothly) turning into white instead. This makes images feel more natural,
- at the cost of reducing information about out-of-range colors.
- </p>
- <p>The default of 2.0 is somewhat conservative and will mostly just apply to
- skies or directly sunlit surfaces. A setting of 0.0 disables this option.
- </p>
- <p>This option works only if the input frame has a supported color tag.
- </p>
- </dd>
- <dt><samp class="option">peak</samp></dt>
- <dd><p>Override signal/nominal/reference peak with this value. Useful when the
- embedded peak information in display metadata is not reliable or when tone
- mapping from a lower range to a higher range.
- </p></dd>
- </dl>
- <a name="tpad"></a>
- <h3 class="section">39.257 tpad<span class="pull-right"><a class="anchor hidden-xs" href="#tpad" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tpad" aria-hidden="true">TOC</a></span></h3>
- <p>Temporarily pad video frames.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">start</samp></dt>
- <dd><p>Specify number of delay frames before input video stream. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">stop</samp></dt>
- <dd><p>Specify number of padding frames after input video stream.
- Set to -1 to pad indefinitely. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">start_mode</samp></dt>
- <dd><p>Set kind of frames added to beginning of stream.
- Can be either <var class="var">add</var> or <var class="var">clone</var>.
- With <var class="var">add</var> frames of solid-color are added.
- With <var class="var">clone</var> frames are clones of first frame.
- Default is <var class="var">add</var>.
- </p>
- </dd>
- <dt><samp class="option">stop_mode</samp></dt>
- <dd><p>Set kind of frames added to end of stream.
- Can be either <var class="var">add</var> or <var class="var">clone</var>.
- With <var class="var">add</var> frames of solid-color are added.
- With <var class="var">clone</var> frames are clones of last frame.
- Default is <var class="var">add</var>.
- </p>
- </dd>
- <dt><samp class="option">start_duration, stop_duration</samp></dt>
- <dd><p>Specify the duration of the start/stop delay. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- These options override <var class="var">start</var> and <var class="var">stop</var>. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify the color of the padded area. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>.
- </p>
- <p>The default value of <var class="var">color</var> is "black".
- </p></dd>
- </dl>
- <a class="anchor" id="transpose"></a><a name="transpose-1"></a>
- <h3 class="section">39.258 transpose<span class="pull-right"><a class="anchor hidden-xs" href="#transpose-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-transpose-1" aria-hidden="true">TOC</a></span></h3>
- <p>Transpose rows with columns in the input video and optionally flip it.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">dir</samp></dt>
- <dd><p>Specify the transposition direction.
- </p>
- <p>Can assume the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">0, 4, cclock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise and vertically flip (default), that is:
- </p><div class="example">
- <pre class="example-preformatted">L.R L.l
- . . -> . .
- l.r R.r
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">1, 5, clock</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise, that is:
- </p><div class="example">
- <pre class="example-preformatted">L.R l.L
- . . -> . .
- l.r r.R
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">2, 6, cclock</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise, that is:
- </p><div class="example">
- <pre class="example-preformatted">L.R R.r
- . . -> . .
- l.r L.l
- </pre></div>
- </dd>
- <dt>‘<samp class="samp">3, 7, clock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise and vertically flip, that is:
- </p><div class="example">
- <pre class="example-preformatted">L.R r.R
- . . -> . .
- l.r l.L
- </pre></div>
- </dd>
- </dl>
- <p>For values between 4-7, the transposition is only done if the input
- video geometry is portrait and not landscape. These values are
- deprecated, the <code class="code">passthrough</code> option should be used instead.
- </p>
- <p>Numerical values are deprecated, and should be dropped in favor of
- symbolic constants.
- </p>
- </dd>
- <dt><samp class="option">passthrough</samp></dt>
- <dd><p>Do not apply the transposition if the input geometry matches the one
- specified by the specified value. It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Always apply transposition.
- </p></dd>
- <dt>‘<samp class="samp">portrait</samp>’</dt>
- <dd><p>Preserve portrait geometry (when <var class="var">height</var> >= <var class="var">width</var>).
- </p></dd>
- <dt>‘<samp class="samp">landscape</samp>’</dt>
- <dd><p>Preserve landscape geometry (when <var class="var">width</var> >= <var class="var">height</var>).
- </p></dd>
- </dl>
- <p>Default value is <code class="code">none</code>.
- </p></dd>
- </dl>
- <p>For example to rotate by 90 degrees clockwise and preserve portrait
- layout:
- </p><div class="example">
- <pre class="example-preformatted">transpose=dir=1:passthrough=portrait
- </pre></div>
- <p>The command above can also be specified as:
- </p><div class="example">
- <pre class="example-preformatted">transpose=1:portrait
- </pre></div>
- <a name="trim"></a>
- <h3 class="section">39.259 trim<span class="pull-right"><a class="anchor hidden-xs" href="#trim" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-trim" aria-hidden="true">TOC</a></span></h3>
- <p>Trim the input so that the output contains one continuous subpart of the input.
- </p>
- <p>It accepts the following parameters:
- </p><dl class="table">
- <dt><samp class="option">start</samp></dt>
- <dd><p>Specify the time of the start of the kept section, i.e. the frame with the
- timestamp <var class="var">start</var> will be the first frame in the output.
- </p>
- </dd>
- <dt><samp class="option">end</samp></dt>
- <dd><p>Specify the time of the first frame that will be dropped, i.e. the frame
- immediately preceding the one with the timestamp <var class="var">end</var> will be the last
- frame in the output.
- </p>
- </dd>
- <dt><samp class="option">start_pts</samp></dt>
- <dd><p>This is the same as <var class="var">start</var>, except this option sets the start timestamp
- in timebase units instead of seconds.
- </p>
- </dd>
- <dt><samp class="option">end_pts</samp></dt>
- <dd><p>This is the same as <var class="var">end</var>, except this option sets the end timestamp
- in timebase units instead of seconds.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>The maximum duration of the output in seconds.
- </p>
- </dd>
- <dt><samp class="option">start_frame</samp></dt>
- <dd><p>The number of the first frame that should be passed to the output.
- </p>
- </dd>
- <dt><samp class="option">end_frame</samp></dt>
- <dd><p>The number of the first frame that should be dropped.
- </p></dd>
- </dl>
- <p><samp class="option">start</samp>, <samp class="option">end</samp>, and <samp class="option">duration</samp> are expressed as time
- duration specifications; see
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>Note that the first two sets of the start/end options and the <samp class="option">duration</samp>
- option look at the frame timestamp, while the _frame variants simply count the
- frames that pass through the filter. Also note that this filter does not modify
- the timestamps. If you wish for the output timestamps to start at zero, insert a
- setpts filter after the trim filter.
- </p>
- <p>If multiple start or end options are set, this filter tries to be greedy and
- keep all the frames that match at least one of the specified constraints. To keep
- only the part that matches all the constraints at once, chain multiple trim
- filters.
- </p>
- <p>The defaults are such that all the input is kept. So it is possible to set e.g.
- just the end values to keep everything before the specified time.
- </p>
- <p>Examples:
- </p><ul class="itemize mark-bullet">
- <li>Drop everything except the second minute of input:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf trim=60:120
- </pre></div>
- </li><li>Keep only the first second:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -vf trim=duration=1
- </pre></div>
- </li></ul>
- <a name="unpremultiply"></a>
- <h3 class="section">39.260 unpremultiply<span class="pull-right"><a class="anchor hidden-xs" href="#unpremultiply" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-unpremultiply" aria-hidden="true">TOC</a></span></h3>
- <p>Apply alpha unpremultiply effect to input video stream using first plane
- of second stream as alpha.
- </p>
- <p>Both streams must have same dimensions and same pixel format.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes will be processed, unprocessed planes will be copied.
- By default value 0xf, all planes will be processed.
- </p>
- <p>If the format has 1 or 2 components, then luma is bit 0.
- If the format has 3 or 4 components:
- for RGB formats bit 0 is green, bit 1 is blue and bit 2 is red;
- for YUV formats bit 0 is luma, bit 1 is chroma-U and bit 2 is chroma-V.
- If present, the alpha channel is always the last bit.
- </p>
- </dd>
- <dt><samp class="option">inplace</samp></dt>
- <dd><p>Do not require 2nd input for processing, instead use alpha plane from input stream.
- </p></dd>
- </dl>
- <a class="anchor" id="unsharp"></a><a name="unsharp-1"></a>
- <h3 class="section">39.261 unsharp<span class="pull-right"><a class="anchor hidden-xs" href="#unsharp-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-unsharp-1" aria-hidden="true">TOC</a></span></h3>
- <p>Sharpen or blur the input video.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_msize_x, lx</samp></dt>
- <dd><p>Set the luma matrix horizontal size. It must be an odd integer between
- 3 and 23. The default value is 5.
- </p>
- </dd>
- <dt><samp class="option">luma_msize_y, ly</samp></dt>
- <dd><p>Set the luma matrix vertical size. It must be an odd integer between 3
- and 23. The default value is 5.
- </p>
- </dd>
- <dt><samp class="option">luma_amount, la</samp></dt>
- <dd><p>Set the luma effect strength. It must be a floating point number, reasonable
- values lay between -1.5 and 1.5.
- </p>
- <p>Negative values will blur the input video, while positive values will
- sharpen it, a value of zero will disable the effect.
- </p>
- <p>Default value is 1.0.
- </p>
- </dd>
- <dt><samp class="option">chroma_msize_x, cx</samp></dt>
- <dd><p>Set the chroma matrix horizontal size. It must be an odd integer
- between 3 and 23. The default value is 5.
- </p>
- </dd>
- <dt><samp class="option">chroma_msize_y, cy</samp></dt>
- <dd><p>Set the chroma matrix vertical size. It must be an odd integer
- between 3 and 23. The default value is 5.
- </p>
- </dd>
- <dt><samp class="option">chroma_amount, ca</samp></dt>
- <dd><p>Set the chroma effect strength. It must be a floating point number, reasonable
- values lay between -1.5 and 1.5.
- </p>
- <p>Negative values will blur the input video, while positive values will
- sharpen it, a value of zero will disable the effect.
- </p>
- <p>Default value is 0.0.
- </p>
- </dd>
- <dt><samp class="option">alpha_msize_x, ax</samp></dt>
- <dd><p>Set the alpha matrix horizontal size. It must be an odd integer
- between 3 and 23. The default value is 5.
- </p>
- </dd>
- <dt><samp class="option">alpha_msize_y, ay</samp></dt>
- <dd><p>Set the alpha matrix vertical size. It must be an odd integer
- between 3 and 23. The default value is 5.
- </p>
- </dd>
- <dt><samp class="option">alpha_amount, aa</samp></dt>
- <dd><p>Set the alpha effect strength. It must be a floating point number, reasonable
- values lay between -1.5 and 1.5.
- </p>
- <p>Negative values will blur the input video, while positive values will
- sharpen it, a value of zero will disable the effect.
- </p>
- <p>Default value is 0.0.
- </p>
- </dd>
- </dl>
- <p>All parameters are optional and default to the equivalent of the
- string ’5:5:1.0:5:5:0.0’.
- </p>
- <a name="Examples-175"></a>
- <h4 class="subsection">39.261.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-175" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-175" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply strong luma sharpen effect:
- <div class="example">
- <pre class="example-preformatted">unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5
- </pre></div>
- </li><li>Apply a strong blur of both luma and chroma parameters:
- <div class="example">
- <pre class="example-preformatted">unsharp=7:7:-2:7:7:-2
- </pre></div>
- </li></ul>
- <a class="anchor" id="untile"></a><a name="untile-1"></a>
- <h3 class="section">39.262 untile<span class="pull-right"><a class="anchor hidden-xs" href="#untile-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-untile-1" aria-hidden="true">TOC</a></span></h3>
- <p>Decompose a video made of tiled images into the individual images.
- </p>
- <p>The frame rate of the output video is the frame rate of the input video
- multiplied by the number of tiles.
- </p>
- <p>This filter does the reverse of <a class="ref" href="#tile">tile</a>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">layout</samp></dt>
- <dd><p>Set the grid size (i.e. the number of lines and columns). For the syntax of
- this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p></dd>
- </dl>
- <a name="Examples-176"></a>
- <h4 class="subsection">39.262.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-176" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-176" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Produce a 1-second video from a still image file made of 25 frames stacked
- vertically, like an analogic film reel:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -r 1 -i image.jpg -vf untile=1x25 movie.mkv
- </pre></div>
- </li></ul>
- <a name="uspp"></a>
- <h3 class="section">39.263 uspp<span class="pull-right"><a class="anchor hidden-xs" href="#uspp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-uspp" aria-hidden="true">TOC</a></span></h3>
- <p>Apply ultra slow/simple postprocessing filter that compresses and decompresses
- the image at several (or - in the case of <samp class="option">quality</samp> level <code class="code">8</code> - all)
- shifts and average the results.
- </p>
- <p>The way this differs from the behavior of spp is that uspp actually encodes &
- decodes each case with libavcodec Snow, whereas spp uses a simplified intra only 8x8
- DCT similar to MJPEG.
- </p>
- <p>This filter is not available in ffmpeg versions between 5.0 and 6.0.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">quality</samp></dt>
- <dd><p>Set quality. This option defines the number of levels for averaging. It accepts
- an integer in the range 0-8. If set to <code class="code">0</code>, the filter will have no
- effect. A value of <code class="code">8</code> means the higher quality. For each increment of
- that value the speed drops by a factor of approximately 2. Default value is
- <code class="code">3</code>.
- </p>
- </dd>
- <dt><samp class="option">qp</samp></dt>
- <dd><p>Force a constant quantization parameter. If not set, the filter will use the QP
- from the video stream (if available).
- </p>
- </dd>
- <dt><samp class="option">codec</samp></dt>
- <dd><p>Use specified codec instead of snow.
- </p></dd>
- </dl>
- <a name="v360"></a>
- <h3 class="section">39.264 v360<span class="pull-right"><a class="anchor hidden-xs" href="#v360" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-v360" aria-hidden="true">TOC</a></span></h3>
- <p>Convert 360 videos between various formats.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">input</samp></dt>
- <dt><samp class="option">output</samp></dt>
- <dd><p>Set format of the input/output video.
- </p>
- <p>Available formats:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">e</samp>’</dt>
- <dt>‘<samp class="samp">equirect</samp>’</dt>
- <dd><p>Equirectangular projection.
- </p>
- </dd>
- <dt>‘<samp class="samp">c3x2</samp>’</dt>
- <dt>‘<samp class="samp">c6x1</samp>’</dt>
- <dt>‘<samp class="samp">c1x6</samp>’</dt>
- <dd><p>Cubemap with 3x2/6x1/1x6 layout.
- </p>
- <p>Format specific options:
- </p>
- <dl class="table">
- <dt><samp class="option">in_pad</samp></dt>
- <dt><samp class="option">out_pad</samp></dt>
- <dd><p>Set padding proportion for the input/output cubemap. Values in decimals.
- </p>
- <p>Example values:
- </p><dl class="table">
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>No padding.
- </p></dd>
- <dt>‘<samp class="samp">0.01</samp>’</dt>
- <dd><p>1% of face is padding. For example, with 1920x1280 resolution face size would be 640x640 and padding would be 3 pixels from each side. (640 * 0.01 = 6 pixels)
- </p></dd>
- </dl>
- <p>Default value is <b class="b">‘<samp class="samp">0</samp>’</b>.
- Maximum value is <b class="b">‘<samp class="samp">0.1</samp>’</b>.
- </p>
- </dd>
- <dt><samp class="option">fin_pad</samp></dt>
- <dt><samp class="option">fout_pad</samp></dt>
- <dd><p>Set fixed padding for the input/output cubemap. Values in pixels.
- </p>
- <p>Default value is <b class="b">‘<samp class="samp">0</samp>’</b>. If greater than zero it overrides other padding options.
- </p>
- </dd>
- <dt><samp class="option">in_forder</samp></dt>
- <dt><samp class="option">out_forder</samp></dt>
- <dd><p>Set order of faces for the input/output cubemap. Choose one direction for each position.
- </p>
- <p>Designation of directions:
- </p><dl class="table">
- <dt>‘<samp class="samp">r</samp>’</dt>
- <dd><p>right
- </p></dd>
- <dt>‘<samp class="samp">l</samp>’</dt>
- <dd><p>left
- </p></dd>
- <dt>‘<samp class="samp">u</samp>’</dt>
- <dd><p>up
- </p></dd>
- <dt>‘<samp class="samp">d</samp>’</dt>
- <dd><p>down
- </p></dd>
- <dt>‘<samp class="samp">f</samp>’</dt>
- <dd><p>forward
- </p></dd>
- <dt>‘<samp class="samp">b</samp>’</dt>
- <dd><p>back
- </p></dd>
- </dl>
- <p>Default value is <b class="b">‘<samp class="samp">rludfb</samp>’</b>.
- </p>
- </dd>
- <dt><samp class="option">in_frot</samp></dt>
- <dt><samp class="option">out_frot</samp></dt>
- <dd><p>Set rotation of faces for the input/output cubemap. Choose one angle for each position.
- </p>
- <p>Designation of angles:
- </p><dl class="table">
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>0 degrees clockwise
- </p></dd>
- <dt>‘<samp class="samp">1</samp>’</dt>
- <dd><p>90 degrees clockwise
- </p></dd>
- <dt>‘<samp class="samp">2</samp>’</dt>
- <dd><p>180 degrees clockwise
- </p></dd>
- <dt>‘<samp class="samp">3</samp>’</dt>
- <dd><p>270 degrees clockwise
- </p></dd>
- </dl>
- <p>Default value is <b class="b">‘<samp class="samp">000000</samp>’</b>.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">eac</samp>’</dt>
- <dd><p>Equi-Angular Cubemap.
- </p>
- </dd>
- <dt>‘<samp class="samp">flat</samp>’</dt>
- <dt>‘<samp class="samp">gnomonic</samp>’</dt>
- <dt>‘<samp class="samp">rectilinear</samp>’</dt>
- <dd><p>Regular video.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">dfisheye</samp>’</dt>
- <dd><p>Dual fisheye.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">barrel</samp>’</dt>
- <dt>‘<samp class="samp">fb</samp>’</dt>
- <dt>‘<samp class="samp">barrelsplit</samp>’</dt>
- <dd><p>Facebook’s 360 formats.
- </p>
- </dd>
- <dt>‘<samp class="samp">sg</samp>’</dt>
- <dd><p>Stereographic format.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">mercator</samp>’</dt>
- <dd><p>Mercator format.
- </p>
- </dd>
- <dt>‘<samp class="samp">ball</samp>’</dt>
- <dd><p>Ball format, gives significant distortion toward the back.
- </p>
- </dd>
- <dt>‘<samp class="samp">hammer</samp>’</dt>
- <dd><p>Hammer-Aitoff map projection format.
- </p>
- </dd>
- <dt>‘<samp class="samp">sinusoidal</samp>’</dt>
- <dd><p>Sinusoidal map projection format.
- </p>
- </dd>
- <dt>‘<samp class="samp">fisheye</samp>’</dt>
- <dd><p>Fisheye projection.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">pannini</samp>’</dt>
- <dd><p>Pannini projection.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dd><p>Set output pannini parameter.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dd><p>Set input pannini parameter.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">cylindrical</samp>’</dt>
- <dd><p>Cylindrical projection.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">perspective</samp>’</dt>
- <dd><p>Perspective projection. <i class="i">(output only)</i>
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">v_fov</samp></dt>
- <dd><p>Set perspective parameter.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">tetrahedron</samp>’</dt>
- <dd><p>Tetrahedron projection.
- </p>
- </dd>
- <dt>‘<samp class="samp">tsp</samp>’</dt>
- <dd><p>Truncated square pyramid projection.
- </p>
- </dd>
- <dt>‘<samp class="samp">he</samp>’</dt>
- <dt>‘<samp class="samp">hequirect</samp>’</dt>
- <dd><p>Half equirectangular projection.
- </p>
- </dd>
- <dt>‘<samp class="samp">equisolid</samp>’</dt>
- <dd><p>Equisolid format.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">og</samp>’</dt>
- <dd><p>Orthographic format.
- </p>
- <p>Format specific options:
- </p><dl class="table">
- <dt><samp class="option">h_fov</samp></dt>
- <dt><samp class="option">v_fov</samp></dt>
- <dt><samp class="option">d_fov</samp></dt>
- <dd><p>Set output horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p>
- </dd>
- <dt><samp class="option">ih_fov</samp></dt>
- <dt><samp class="option">iv_fov</samp></dt>
- <dt><samp class="option">id_fov</samp></dt>
- <dd><p>Set input horizontal/vertical/diagonal field of view. Values in degrees.
- </p>
- <p>If diagonal field of view is set it overrides horizontal and vertical field of view.
- </p></dd>
- </dl>
- </dd>
- <dt>‘<samp class="samp">octahedron</samp>’</dt>
- <dd><p>Octahedron projection.
- </p>
- </dd>
- <dt>‘<samp class="samp">cylindricalea</samp>’</dt>
- <dd><p>Cylindrical Equal Area projection.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Set interpolation method.<br>
- <i class="i">Note: more complex interpolation methods require much more memory to run.</i>
- </p>
- <p>Available methods:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">near</samp>’</dt>
- <dt>‘<samp class="samp">nearest</samp>’</dt>
- <dd><p>Nearest neighbour.
- </p></dd>
- <dt>‘<samp class="samp">line</samp>’</dt>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Bilinear interpolation.
- </p></dd>
- <dt>‘<samp class="samp">lagrange9</samp>’</dt>
- <dd><p>Lagrange9 interpolation.
- </p></dd>
- <dt>‘<samp class="samp">cube</samp>’</dt>
- <dt>‘<samp class="samp">cubic</samp>’</dt>
- <dd><p>Bicubic interpolation.
- </p></dd>
- <dt>‘<samp class="samp">lanc</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dd><p>Lanczos interpolation.
- </p></dd>
- <dt>‘<samp class="samp">sp16</samp>’</dt>
- <dt>‘<samp class="samp">spline16</samp>’</dt>
- <dd><p>Spline16 interpolation.
- </p></dd>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">gaussian</samp>’</dt>
- <dd><p>Gaussian interpolation.
- </p></dd>
- <dt>‘<samp class="samp">mitchell</samp>’</dt>
- <dd><p>Mitchell interpolation.
- </p></dd>
- </dl>
- <p>Default value is <b class="b">‘<samp class="samp">line</samp>’</b>.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the output video resolution.
- </p>
- <p>Default resolution depends on formats.
- </p>
- </dd>
- <dt><samp class="option">in_stereo</samp></dt>
- <dt><samp class="option">out_stereo</samp></dt>
- <dd><p>Set the input/output stereo format.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">2d</samp>’</dt>
- <dd><p>2D mono
- </p></dd>
- <dt>‘<samp class="samp">sbs</samp>’</dt>
- <dd><p>Side by side
- </p></dd>
- <dt>‘<samp class="samp">tb</samp>’</dt>
- <dd><p>Top bottom
- </p></dd>
- </dl>
- <p>Default value is <b class="b">‘<samp class="samp">2d</samp>’</b> for input and output format.
- </p>
- </dd>
- <dt><samp class="option">yaw</samp></dt>
- <dt><samp class="option">pitch</samp></dt>
- <dt><samp class="option">roll</samp></dt>
- <dd><p>Set rotation for the output video. Values in degrees.
- </p>
- </dd>
- <dt><samp class="option">rorder</samp></dt>
- <dd><p>Set rotation order for the output video. Choose one item for each position.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">y, Y</samp>’</dt>
- <dd><p>yaw
- </p></dd>
- <dt>‘<samp class="samp">p, P</samp>’</dt>
- <dd><p>pitch
- </p></dd>
- <dt>‘<samp class="samp">r, R</samp>’</dt>
- <dd><p>roll
- </p></dd>
- </dl>
- <p>Default value is <b class="b">‘<samp class="samp">ypr</samp>’</b>.
- </p>
- </dd>
- <dt><samp class="option">h_flip</samp></dt>
- <dt><samp class="option">v_flip</samp></dt>
- <dt><samp class="option">d_flip</samp></dt>
- <dd><p>Flip the output video horizontally(swaps left-right)/vertically(swaps up-down)/in-depth(swaps back-forward). Boolean values.
- </p>
- </dd>
- <dt><samp class="option">ih_flip</samp></dt>
- <dt><samp class="option">iv_flip</samp></dt>
- <dd><p>Set if input video is flipped horizontally/vertically. Boolean values.
- </p>
- </dd>
- <dt><samp class="option">in_trans</samp></dt>
- <dd><p>Set if input video is transposed. Boolean value, by default disabled.
- </p>
- </dd>
- <dt><samp class="option">out_trans</samp></dt>
- <dd><p>Set if output video needs to be transposed. Boolean value, by default disabled.
- </p>
- </dd>
- <dt><samp class="option">h_offset</samp></dt>
- <dt><samp class="option">v_offset</samp></dt>
- <dd><p>Set output horizontal/vertical off-axis offset. Default is set to 0.
- Allowed range is from -1 to 1.
- </p>
- </dd>
- <dt><samp class="option">alpha_mask</samp></dt>
- <dd><p>Build mask in alpha plane for all unmapped pixels by marking them fully transparent. Boolean value, by default disabled.
- </p>
- </dd>
- <dt><samp class="option">reset_rot</samp></dt>
- <dd><p>Reset rotation of output video. Boolean value, by default disabled.
- </p></dd>
- </dl>
- <a name="Examples-177"></a>
- <h4 class="subsection">39.264.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-177" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-177" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert equirectangular video to cubemap with 3x2 layout and 1% padding using bicubic interpolation:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv -vf v360=e:c3x2:cubic:out_pad=0.01 output.mkv
- </pre></div>
- </li><li>Extract back view of Equi-Angular Cubemap:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.mkv -vf v360=eac:flat:yaw=180 output.mkv
- </pre></div>
- </li><li>Convert transposed and horizontally flipped Equi-Angular Cubemap in side-by-side stereo format to equirectangular top-bottom stereo format:
- <div class="example">
- <pre class="example-preformatted">v360=eac:equirect:in_stereo=sbs:in_trans=1:ih_flip=1:out_stereo=tb
- </pre></div>
- </li></ul>
- <a name="Commands-149"></a>
- <h4 class="subsection">39.264.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-149" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-149" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports subset of above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="vaguedenoiser"></a>
- <h3 class="section">39.265 vaguedenoiser<span class="pull-right"><a class="anchor hidden-xs" href="#vaguedenoiser" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vaguedenoiser" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a wavelet based denoiser.
- </p>
- <p>It transforms each frame from the video input into the wavelet domain,
- using Cohen-Daubechies-Feauveau 9/7. Then it applies some filtering to
- the obtained coefficients. It does an inverse wavelet transform after.
- Due to wavelet properties, it should give a nice smoothed result, and
- reduced noise, without blurring picture features.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>The filtering strength. The higher, the more filtered the video will be.
- Hard thresholding can use a higher threshold than soft thresholding
- before the video looks overfiltered. Default value is 2.
- </p>
- </dd>
- <dt><samp class="option">method</samp></dt>
- <dd><p>The filtering method the filter will use.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">hard</samp>’</dt>
- <dd><p>All values under the threshold will be zeroed.
- </p>
- </dd>
- <dt>‘<samp class="samp">soft</samp>’</dt>
- <dd><p>All values under the threshold will be zeroed. All values above will be
- reduced by the threshold.
- </p>
- </dd>
- <dt>‘<samp class="samp">garrote</samp>’</dt>
- <dd><p>Scales or nullifies coefficients - intermediary between (more) soft and
- (less) hard thresholding.
- </p></dd>
- </dl>
- <p>Default is garrote.
- </p>
- </dd>
- <dt><samp class="option">nsteps</samp></dt>
- <dd><p>Number of times, the wavelet will decompose the picture. Picture can’t
- be decomposed beyond a particular point (typically, 8 for a 640x480
- frame - as 2^9 = 512 > 480). Valid values are integers between 1 and 32. Default value is 6.
- </p>
- </dd>
- <dt><samp class="option">percent</samp></dt>
- <dd><p>Partial of full denoising (limited coefficients shrinking), from 0 to 100. Default value is 85.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>A list of the planes to process. By default all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>The threshold type the filter will use.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">universal</samp>’</dt>
- <dd><p>Threshold used is same for all decompositions.
- </p>
- </dd>
- <dt>‘<samp class="samp">bayes</samp>’</dt>
- <dd><p>Threshold used depends also on each decomposition coefficients.
- </p></dd>
- </dl>
- <p>Default is universal.
- </p></dd>
- </dl>
- <a name="varblur"></a>
- <h3 class="section">39.266 varblur<span class="pull-right"><a class="anchor hidden-xs" href="#varblur" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-varblur" aria-hidden="true">TOC</a></span></h3>
- <p>Apply variable blur filter by using 2nd video stream to set blur radius.
- The 2nd stream must have the same dimensions.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">min_r</samp></dt>
- <dd><p>Set min allowed radius. Allowed range is from 0 to 254. Default is 0.
- </p></dd>
- <dt><samp class="option">max_r</samp></dt>
- <dd><p>Set max allowed radius. Allowed range is from 1 to 255. Default is 8.
- </p></dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process. By default, all are used.
- </p></dd>
- </dl>
- <p>The <code class="code">varblur</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="Commands-150"></a>
- <h4 class="subsection">39.266.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-150" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-150" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports all the above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="vectorscope"></a>
- <h3 class="section">39.267 vectorscope<span class="pull-right"><a class="anchor hidden-xs" href="#vectorscope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vectorscope" aria-hidden="true">TOC</a></span></h3>
- <p>Display 2 color component values in the two dimensional graph (which is called
- a vectorscope).
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set vectorscope mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">gray</samp>’</dt>
- <dt>‘<samp class="samp">tint</samp>’</dt>
- <dd><p>Gray values are displayed on graph, higher brightness means more pixels have
- same component color value on location in graph. This is the default mode.
- </p>
- </dd>
- <dt>‘<samp class="samp">color</samp>’</dt>
- <dd><p>Gray values are displayed on graph. Surrounding pixels values which are not
- present in video frame are drawn in gradient of 2 color components which are
- set by option <code class="code">x</code> and <code class="code">y</code>. The 3rd color component is static.
- </p>
- </dd>
- <dt>‘<samp class="samp">color2</samp>’</dt>
- <dd><p>Actual color components values present in video frame are displayed on graph.
- </p>
- </dd>
- <dt>‘<samp class="samp">color3</samp>’</dt>
- <dd><p>Similar as color2 but higher frequency of same values <code class="code">x</code> and <code class="code">y</code>
- on graph increases value of another color component, which is luminance by
- default values of <code class="code">x</code> and <code class="code">y</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">color4</samp>’</dt>
- <dd><p>Actual colors present in video frame are displayed on graph. If two different
- colors map to same position on graph then color with higher value of component
- not present in graph is picked.
- </p>
- </dd>
- <dt>‘<samp class="samp">color5</samp>’</dt>
- <dd><p>Gray values are displayed on graph. Similar to <code class="code">color</code> but with 3rd color
- component picked from radial gradient.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set which color component will be represented on X-axis. Default is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set which color component will be represented on Y-axis. Default is <code class="code">2</code>.
- </p>
- </dd>
- <dt><samp class="option">intensity, i</samp></dt>
- <dd><p>Set intensity, used by modes: gray, color, color3 and color5 for increasing brightness
- of color component which represents frequency of (X, Y) location in graph.
- </p>
- </dd>
- <dt><samp class="option">envelope, e</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No envelope, this is default.
- </p>
- </dd>
- <dt>‘<samp class="samp">instant</samp>’</dt>
- <dd><p>Instant envelope, even darkest single pixel will be clearly highlighted.
- </p>
- </dd>
- <dt>‘<samp class="samp">peak</samp>’</dt>
- <dd><p>Hold maximum and minimum values presented in graph over time. This way you
- can still spot out of range values without constantly looking at vectorscope.
- </p>
- </dd>
- <dt>‘<samp class="samp">peak+instant</samp>’</dt>
- <dd><p>Peak and instant envelope combined together.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">graticule, g</samp></dt>
- <dd><p>Set what kind of graticule to draw.
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dt>‘<samp class="samp">green</samp>’</dt>
- <dt>‘<samp class="samp">color</samp>’</dt>
- <dt>‘<samp class="samp">invert</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">opacity, o</samp></dt>
- <dd><p>Set graticule opacity.
- </p>
- </dd>
- <dt><samp class="option">flags, f</samp></dt>
- <dd><p>Set graticule flags.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">white</samp>’</dt>
- <dd><p>Draw graticule for white point.
- </p>
- </dd>
- <dt>‘<samp class="samp">black</samp>’</dt>
- <dd><p>Draw graticule for black point.
- </p>
- </dd>
- <dt>‘<samp class="samp">name</samp>’</dt>
- <dd><p>Draw color points short names.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">bgopacity, b</samp></dt>
- <dd><p>Set background opacity.
- </p>
- </dd>
- <dt><samp class="option">lthreshold, l</samp></dt>
- <dd><p>Set low threshold for color component not represented on X or Y axis.
- Values lower than this value will be ignored. Default is 0.
- Note this value is multiplied with actual max possible value one pixel component
- can have. So for 8-bit input and low threshold value of 0.1 actual threshold
- is 0.1 * 255 = 25.
- </p>
- </dd>
- <dt><samp class="option">hthreshold, h</samp></dt>
- <dd><p>Set high threshold for color component not represented on X or Y axis.
- Values higher than this value will be ignored. Default is 1.
- Note this value is multiplied with actual max possible value one pixel component
- can have. So for 8-bit input and high threshold value of 0.9 actual threshold
- is 0.9 * 255 = 230.
- </p>
- </dd>
- <dt><samp class="option">colorspace, c</samp></dt>
- <dd><p>Set what kind of colorspace to use when drawing graticule.
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dt>‘<samp class="samp">601</samp>’</dt>
- <dt>‘<samp class="samp">709</samp>’</dt>
- </dl>
- <p>Default is auto.
- </p>
- </dd>
- <dt><samp class="option">tint0, t0</samp></dt>
- <dt><samp class="option">tint1, t1</samp></dt>
- <dd><p>Set color tint for gray/tint vectorscope mode. By default both options are zero.
- This means no tint, and output will remain gray.
- </p></dd>
- </dl>
- <a class="anchor" id="vidstabdetect"></a><a name="vidstabdetect-1"></a>
- <h3 class="section">39.268 vidstabdetect<span class="pull-right"><a class="anchor hidden-xs" href="#vidstabdetect-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vidstabdetect-1" aria-hidden="true">TOC</a></span></h3>
- <p>Analyze video stabilization/deshaking. Perform pass 1 of 2, see
- <a class="ref" href="#vidstabtransform">vidstabtransform</a> for pass 2.
- </p>
- <p>This filter generates a file with relative translation and rotation
- transform information about subsequent frames, which is then used by
- the <a class="ref" href="#vidstabtransform">vidstabtransform</a> filter.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-libvidstab</code>.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">result</samp></dt>
- <dd><p>Set the path to the file used to write the transforms information.
- Default value is <samp class="file">transforms.trf</samp>.
- </p>
- </dd>
- <dt><samp class="option">shakiness</samp></dt>
- <dd><p>Set how shaky the video is and how quick the camera is. It accepts an
- integer in the range 1-10, a value of 1 means little shakiness, a
- value of 10 means strong shakiness. Default value is 5.
- </p>
- </dd>
- <dt><samp class="option">accuracy</samp></dt>
- <dd><p>Set the accuracy of the detection process. It must be a value in the
- range 1-15. A value of 1 means low accuracy, a value of 15 means high
- accuracy. Default value is 15.
- </p>
- </dd>
- <dt><samp class="option">stepsize</samp></dt>
- <dd><p>Set stepsize of the search process. The region around minimum is
- scanned with 1 pixel resolution. Default value is 6.
- </p>
- </dd>
- <dt><samp class="option">mincontrast</samp></dt>
- <dd><p>Set minimum contrast. Below this value a local measurement field is
- discarded. Must be a floating point value in the range 0-1. Default
- value is 0.3.
- </p>
- </dd>
- <dt><samp class="option">tripod</samp></dt>
- <dd><p>Set reference frame number for tripod mode.
- </p>
- <p>If enabled, the motion of the frames is compared to a reference frame
- in the filtered stream, identified by the specified number. The idea
- is to compensate all movements in a more-or-less static scene and keep
- the camera view absolutely still.
- </p>
- <p>If set to 0, it is disabled. The frames are counted starting from 1.
- </p>
- </dd>
- <dt><samp class="option">show</samp></dt>
- <dd><p>Show fields and transforms in the resulting frames. It accepts an
- integer in the range 0-2. Default value is 0, which disables any
- visualization.
- </p>
- </dd>
- <dt><samp class="option">fileformat</samp></dt>
- <dd><p>Format for the transforms data file to be written.
- Acceptable values are
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">ascii</samp>’</dt>
- <dd><p>Human-readable plain text
- </p>
- </dd>
- <dt>‘<samp class="samp">binary</samp>’</dt>
- <dd><p>Binary format, roughly 40% smaller than <code class="code">ascii</code>. (<em class="emph">default</em>)
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-178"></a>
- <h4 class="subsection">39.268.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-178" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-178" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use default values:
- <div class="example">
- <pre class="example-preformatted">vidstabdetect
- </pre></div>
- </li><li>Analyze strongly shaky movie and put the results in file
- <samp class="file">mytransforms.trf</samp>:
- <div class="example">
- <pre class="example-preformatted">vidstabdetect=shakiness=10:accuracy=15:result="mytransforms.trf"
- </pre></div>
- </li><li>Visualize the result of internal transformations in the resulting
- video:
- <div class="example">
- <pre class="example-preformatted">vidstabdetect=show=1
- </pre></div>
- </li><li>Analyze a video with medium shakiness using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input -vf vidstabdetect=shakiness=5:show=1 dummy.avi
- </pre></div>
- </li></ul>
- <a class="anchor" id="vidstabtransform"></a><a name="vidstabtransform-1"></a>
- <h3 class="section">39.269 vidstabtransform<span class="pull-right"><a class="anchor hidden-xs" href="#vidstabtransform-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vidstabtransform-1" aria-hidden="true">TOC</a></span></h3>
- <p>Video stabilization/deshaking: pass 2 of 2,
- see <a class="ref" href="#vidstabdetect">vidstabdetect</a> for pass 1.
- </p>
- <p>Read a file with transform information for each frame and
- apply/compensate them. Together with the <a class="ref" href="#vidstabdetect">vidstabdetect</a>
- filter this can be used to deshake videos. See also
- <a class="url" href="http://public.hronopik.de/vid.stab">http://public.hronopik.de/vid.stab</a>. It is important to also use
- the <a class="ref" href="#unsharp">unsharp</a> filter, see below.
- </p>
- <p>To enable compilation of this filter you need to configure FFmpeg with
- <code class="code">--enable-libvidstab</code>.
- </p>
- <a name="Options-124"></a>
- <h4 class="subsection">39.269.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-124" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-124" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">input</samp></dt>
- <dd><p>Set path to the file used to read the transforms. Default value is
- <samp class="file">transforms.trf</samp>.
- </p>
- </dd>
- <dt><samp class="option">smoothing</samp></dt>
- <dd><p>Set the number of frames (value*2 + 1) used for lowpass filtering the
- camera movements. Default value is 10.
- </p>
- <p>For example a number of 10 means that 21 frames are used (10 in the
- past and 10 in the future) to smoothen the motion in the video. A
- larger value leads to a smoother video, but limits the acceleration of
- the camera (pan/tilt movements). 0 is a special case where a static
- camera is simulated.
- </p>
- </dd>
- <dt><samp class="option">optalgo</samp></dt>
- <dd><p>Set the camera path optimization algorithm.
- </p>
- <p>Accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dd><p>gaussian kernel low-pass filter on camera motion (default)
- </p></dd>
- <dt>‘<samp class="samp">avg</samp>’</dt>
- <dd><p>averaging on transformations
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">maxshift</samp></dt>
- <dd><p>Set maximal number of pixels to translate frames. Default value is -1,
- meaning no limit.
- </p>
- </dd>
- <dt><samp class="option">maxangle</samp></dt>
- <dd><p>Set maximal angle in radians (degree*PI/180) to rotate frames. Default
- value is -1, meaning no limit.
- </p>
- </dd>
- <dt><samp class="option">crop</samp></dt>
- <dd><p>Specify how to deal with borders that may be visible due to movement
- compensation.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">keep</samp>’</dt>
- <dd><p>keep image information from previous frame (default)
- </p></dd>
- <dt>‘<samp class="samp">black</samp>’</dt>
- <dd><p>fill the border black
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">invert</samp></dt>
- <dd><p>Invert transforms if set to 1. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">relative</samp></dt>
- <dd><p>Consider transforms as relative to previous frame if set to 1,
- absolute if set to 0. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">zoom</samp></dt>
- <dd><p>Set percentage to zoom. A positive value will result in a zoom-in
- effect, a negative value in a zoom-out effect. Default value is 0 (no
- zoom).
- </p>
- </dd>
- <dt><samp class="option">optzoom</samp></dt>
- <dd><p>Set optimal zooming to avoid borders.
- </p>
- <p>Accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">0</samp>’</dt>
- <dd><p>disabled
- </p></dd>
- <dt>‘<samp class="samp">1</samp>’</dt>
- <dd><p>optimal static zoom value is determined (only very strong movements
- will lead to visible borders) (default)
- </p></dd>
- <dt>‘<samp class="samp">2</samp>’</dt>
- <dd><p>optimal adaptive zoom value is determined (no borders will be
- visible), see <samp class="option">zoomspeed</samp>
- </p></dd>
- </dl>
- <p>Note that the value given at zoom is added to the one calculated here.
- </p>
- </dd>
- <dt><samp class="option">zoomspeed</samp></dt>
- <dd><p>Set percent to zoom maximally each frame (enabled when
- <samp class="option">optzoom</samp> is set to 2). Range is from 0 to 5, default value is
- 0.25.
- </p>
- </dd>
- <dt><samp class="option">interpol</samp></dt>
- <dd><p>Specify type of interpolation.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">no</samp>’</dt>
- <dd><p>no interpolation
- </p></dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>linear only horizontal
- </p></dd>
- <dt>‘<samp class="samp">bilinear</samp>’</dt>
- <dd><p>linear in both directions (default)
- </p></dd>
- <dt>‘<samp class="samp">bicubic</samp>’</dt>
- <dd><p>cubic in both directions (slow)
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">tripod</samp></dt>
- <dd><p>Enable virtual tripod mode if set to 1, which is equivalent to
- <code class="code">relative=0:smoothing=0</code>. Default value is 0.
- </p>
- <p>Use also <code class="code">tripod</code> option of <a class="ref" href="#vidstabdetect">vidstabdetect</a>.
- </p>
- </dd>
- <dt><samp class="option">debug</samp></dt>
- <dd><p>Increase log verbosity if set to 1. Also the detected global motions
- are written to the temporary file <samp class="file">global_motions.trf</samp>. Default
- value is 0.
- </p></dd>
- </dl>
- <a name="Examples-179"></a>
- <h4 class="subsection">39.269.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-179" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-179" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use <code class="command">ffmpeg</code> for a typical stabilization with default values:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i inp.mpeg -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 inp_stabilized.mpeg
- </pre></div>
- <p>Note the use of the <a class="ref" href="#unsharp">unsharp</a> filter which is always recommended.
- </p>
- </li><li>Zoom in a bit more and load transform data from a given file:
- <div class="example">
- <pre class="example-preformatted">vidstabtransform=zoom=5:input="mytransforms.trf"
- </pre></div>
- </li><li>Smoothen the video even more:
- <div class="example">
- <pre class="example-preformatted">vidstabtransform=smoothing=30
- </pre></div>
- </li></ul>
- <a name="vflip"></a>
- <h3 class="section">39.270 vflip<span class="pull-right"><a class="anchor hidden-xs" href="#vflip" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vflip" aria-hidden="true">TOC</a></span></h3>
- <p>Flip the input video vertically.
- </p>
- <p>For example, to vertically flip a video with <code class="command">ffmpeg</code>:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i in.avi -vf "vflip" out.avi
- </pre></div>
- <a name="vfrdet"></a>
- <h3 class="section">39.271 vfrdet<span class="pull-right"><a class="anchor hidden-xs" href="#vfrdet" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vfrdet" aria-hidden="true">TOC</a></span></h3>
- <p>Detect variable frame rate video.
- </p>
- <p>This filter tries to detect if the input is variable or constant frame rate.
- </p>
- <p>At end it will output number of frames detected as having variable delta pts,
- and ones with constant delta pts.
- If there was frames with variable delta, than it will also show min, max and
- average delta encountered.
- </p>
- <a name="vibrance"></a>
- <h3 class="section">39.272 vibrance<span class="pull-right"><a class="anchor hidden-xs" href="#vibrance" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vibrance" aria-hidden="true">TOC</a></span></h3>
- <p>Boost or alter saturation.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">intensity</samp></dt>
- <dd><p>Set strength of boost if positive value or strength of alter if negative value.
- Default is 0. Allowed range is from -2 to 2.
- </p>
- </dd>
- <dt><samp class="option">rbal</samp></dt>
- <dd><p>Set the red balance. Default is 1. Allowed range is from -10 to 10.
- </p>
- </dd>
- <dt><samp class="option">gbal</samp></dt>
- <dd><p>Set the green balance. Default is 1. Allowed range is from -10 to 10.
- </p>
- </dd>
- <dt><samp class="option">bbal</samp></dt>
- <dd><p>Set the blue balance. Default is 1. Allowed range is from -10 to 10.
- </p>
- </dd>
- <dt><samp class="option">rlum</samp></dt>
- <dd><p>Set the red luma coefficient.
- </p>
- </dd>
- <dt><samp class="option">glum</samp></dt>
- <dd><p>Set the green luma coefficient.
- </p>
- </dd>
- <dt><samp class="option">blum</samp></dt>
- <dd><p>Set the blue luma coefficient.
- </p>
- </dd>
- <dt><samp class="option">alternate</samp></dt>
- <dd><p>If <code class="code">intensity</code> is negative and this is set to 1, colors will change,
- otherwise colors will be less saturated, more towards gray.
- </p></dd>
- </dl>
- <a name="Commands-151"></a>
- <h4 class="subsection">39.272.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-151" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-151" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="vif"></a>
- <h3 class="section">39.273 vif<span class="pull-right"><a class="anchor hidden-xs" href="#vif" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vif" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the average VIF (Visual Information Fidelity) between two input videos.
- </p>
- <p>This filter takes two input videos.
- </p>
- <p>Both input videos must have the same resolution and pixel format for
- this filter to work correctly. Also it assumes that both inputs
- have the same number of frames, which are compared one by one.
- </p>
- <p>The obtained average VIF score is printed through the logging system.
- </p>
- <p>The filter stores the calculated VIF score of each frame.
- </p>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>In the below example the input file <samp class="file">main.mpg</samp> being processed is compared
- with the reference file <samp class="file">ref.mpg</samp>.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i main.mpg -i ref.mpg -lavfi vif -f null -
- </pre></div>
- <a class="anchor" id="vignette"></a><a name="vignette-1"></a>
- <h3 class="section">39.274 vignette<span class="pull-right"><a class="anchor hidden-xs" href="#vignette-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vignette-1" aria-hidden="true">TOC</a></span></h3>
- <p>Make or reverse a natural vignetting effect.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">angle, a</samp></dt>
- <dd><p>Set lens angle expression as a number of radians.
- </p>
- <p>The value is clipped in the <code class="code">[0,PI/2]</code> range.
- </p>
- <p>Default value: <code class="code">"PI/5"</code>
- </p>
- </dd>
- <dt><samp class="option">x0</samp></dt>
- <dt><samp class="option">y0</samp></dt>
- <dd><p>Set center coordinates expressions. Respectively <code class="code">"w/2"</code> and <code class="code">"h/2"</code>
- by default.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set forward/backward mode.
- </p>
- <p>Available modes are:
- </p><dl class="table">
- <dt>‘<samp class="samp">forward</samp>’</dt>
- <dd><p>The larger the distance from the central point, the darker the image becomes.
- </p>
- </dd>
- <dt>‘<samp class="samp">backward</samp>’</dt>
- <dd><p>The larger the distance from the central point, the brighter the image becomes.
- This can be used to reverse a vignette effect, though there is no automatic
- detection to extract the lens <samp class="option">angle</samp> and other settings (yet). It can
- also be used to create a burning effect.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">forward</samp>’.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set evaluation mode for the expressions (<samp class="option">angle</samp>, <samp class="option">x0</samp>, <samp class="option">y0</samp>).
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>Evaluate expressions only once during the filter initialization.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Evaluate expressions for each incoming frame. This is way slower than the
- ‘<samp class="samp">init</samp>’ mode since it requires all the scalers to be re-computed, but it
- allows advanced dynamic expressions.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">init</samp>’.
- </p>
- </dd>
- <dt><samp class="option">dither</samp></dt>
- <dd><p>Set dithering to reduce the circular banding effects. Default is <code class="code">1</code>
- (enabled).
- </p>
- </dd>
- <dt><samp class="option">aspect</samp></dt>
- <dd><p>Set vignette aspect. This setting allows one to adjust the shape of the vignette.
- Setting this value to the SAR of the input will make a rectangular vignetting
- following the dimensions of the video.
- </p>
- <p>Default is <code class="code">1/1</code>.
- </p></dd>
- </dl>
- <a name="Expressions"></a>
- <h4 class="subsection">39.274.1 Expressions<span class="pull-right"><a class="anchor hidden-xs" href="#Expressions" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Expressions" aria-hidden="true">TOC</a></span></h4>
- <p>The <samp class="option">alpha</samp>, <samp class="option">x0</samp> and <samp class="option">y0</samp> expressions can contain the
- following parameters.
- </p>
- <dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>input width and height
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>the number of input frame, starting from 0
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>the PTS (Presentation TimeStamp) time of the filtered video frame, expressed in
- <var class="var">TB</var> units, NAN if undefined
- </p>
- </dd>
- <dt><samp class="option">r</samp></dt>
- <dd><p>frame rate of the input video, NAN if the input frame rate is unknown
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>the PTS (Presentation TimeStamp) of the filtered video frame,
- expressed in seconds, NAN if undefined
- </p>
- </dd>
- <dt><samp class="option">tb</samp></dt>
- <dd><p>time base of the input video
- </p></dd>
- </dl>
- <a name="Examples-180"></a>
- <h4 class="subsection">39.274.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-180" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-180" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply simple strong vignetting effect:
- <div class="example">
- <pre class="example-preformatted">vignette=PI/4
- </pre></div>
- </li><li>Make a flickering vignetting:
- <div class="example">
- <pre class="example-preformatted">vignette='PI/4+random(1)*PI/50':eval=frame
- </pre></div>
- </li></ul>
- <a name="vmafmotion"></a>
- <h3 class="section">39.275 vmafmotion<span class="pull-right"><a class="anchor hidden-xs" href="#vmafmotion" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vmafmotion" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the average VMAF motion score of a video.
- It is one of the component metrics of VMAF.
- </p>
- <p>The obtained average motion score is printed through the logging system.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">stats_file</samp></dt>
- <dd><p>If specified, the filter will use the named file to save the motion score of
- each frame with respect to the previous frame.
- When filename equals "-" the data is sent to standard output.
- </p></dd>
- </dl>
- <p>Example:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -i ref.mpg -vf vmafmotion -f null -
- </pre></div>
- <a class="anchor" id="vpp_005famf"></a><a name="vpp_005famf-1"></a>
- <h3 class="section">39.276 vpp_amf<span class="pull-right"><a class="anchor hidden-xs" href="#vpp_005famf-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vpp_005famf-1" aria-hidden="true">TOC</a></span></h3>
- <p>Scale (resize) and convert colorspace, transfer characteristics or color primaries for the input video, using AMD Advanced Media Framework library for hardware acceleration.
- Setting the output width and height works in the same way as for the <a class="ref" href="#scale">scale</a> filter.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the output video dimension expression. Default value is the input dimension.
- </p>
- <p>Allows for the same expressions as the <a class="ref" href="#scale">scale</a> filter.
- </p>
- </dd>
- <dt><samp class="option">scale_type</samp></dt>
- <dd><p>Sets the algorithm used for scaling:
- </p>
- <dl class="table">
- <dt><var class="var">bilinear</var></dt>
- <dd><p>Bilinear
- </p>
- <p>This is the default.
- </p>
- </dd>
- <dt><var class="var">bicubic</var></dt>
- <dd><p>Bicubic
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Controls the output pixel format. By default, or if none is specified, the input
- pixel format is used.
- </p>
- </dd>
- <dt><samp class="option">force_original_aspect_ratio</samp></dt>
- <dt><samp class="option">force_divisible_by</samp></dt>
- <dd><p>Work the same as the identical <a class="ref" href="#scale">scale</a> filter options.
- </p>
- </dd>
- <dt><samp class="option">reset_sar</samp></dt>
- <dd><p>Works the same as the identical <a class="ref" href="#scale">scale</a> filter option.
- </p>
- <a class="anchor" id="color_005fprofile"></a></dd>
- <dt><samp class="option">color_profile</samp></dt>
- <dd><p>Specify all color properties at once.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt601</samp>’</dt>
- <dd><p>BT.601
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>BT.2020
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">trc</samp></dt>
- <dd><p>Specify output transfer characteristics.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">gamma22</samp>’</dt>
- <dd><p>Constant gamma of 2.2
- </p>
- </dd>
- <dt>‘<samp class="samp">gamma28</samp>’</dt>
- <dd><p>Constant gamma of 2.8
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dd><p>Linear
- </p>
- </dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>LOG
- </p>
- </dd>
- <dt>‘<samp class="samp">log-sqrt</samp>’</dt>
- <dd><p>LOG_SQRT
- </p>
- </dd>
- <dt>‘<samp class="samp">iec61966-2-4</samp>’</dt>
- <dd><p>iec61966-2-4
- </p>
- </dd>
- <dt>‘<samp class="samp">bt1361-ecg</samp>’</dt>
- <dd><p>BT1361_ECG
- </p>
- </dd>
- <dt>‘<samp class="samp">iec61966-2-1</samp>’</dt>
- <dd><p>iec61966-2-1
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020-10</samp>’</dt>
- <dd><p>BT.2020 for 10-bits content
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020-12</samp>’</dt>
- <dd><p>BT.2020 for 12-bits content
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte2084</samp>’</dt>
- <dd><p>SMPTE2084
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dd><p>SMPTE428
- </p>
- </dd>
- <dt>‘<samp class="samp">arib-std-b67</samp>’</dt>
- <dd><p>ARIB_STD_B67
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">primaries</samp></dt>
- <dd><p>Specify output color primaries.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470m</samp>’</dt>
- <dd><p>BT.470M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG or BT.601-6 625
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M or BT.601-6 525
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">film</samp>’</dt>
- <dd><p>film
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020</samp>’</dt>
- <dd><p>BT.2020
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte428</samp>’</dt>
- <dd><p>SMPTE-428
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte431</samp>’</dt>
- <dd><p>SMPTE-431
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte432</samp>’</dt>
- <dd><p>SMPTE-432
- </p>
- </dd>
- <dt>‘<samp class="samp">jedec-p22</samp>’</dt>
- <dd><p>JEDEC P22 phosphors
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-181"></a>
- <h4 class="subsection">39.276.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-181" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-181" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Scale input to 720p, keeping aspect ratio and ensuring the output is yuv420p.
- <div class="example">
- <pre class="example-preformatted">vpp_amf=-2:720:format=yuv420p
- </pre></div>
- </li><li>Upscale to 4K and change color profile to bt2020.
- <div class="example">
- <pre class="example-preformatted">vpp_amf=4096:2160:color_profile=bt2020
- </pre></div>
- </li></ul>
- <a class="anchor" id="vstack"></a><a name="vstack-1"></a>
- <h3 class="section">39.277 vstack<span class="pull-right"><a class="anchor hidden-xs" href="#vstack-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vstack-1" aria-hidden="true">TOC</a></span></h3>
- <p>Stack input videos vertically.
- </p>
- <p>All streams must be of same pixel format and of same width.
- </p>
- <p>Note that this filter is faster than using <a class="ref" href="#overlay">overlay</a> and <a class="ref" href="#pad">pad</a> filter
- to create same output.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set number of input streams. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>If set to 1, force the output to terminate when the shortest input
- terminates. Default value is 0.
- </p></dd>
- </dl>
- <a name="w3fdif"></a>
- <h3 class="section">39.278 w3fdif<span class="pull-right"><a class="anchor hidden-xs" href="#w3fdif" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-w3fdif" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlace the input video ("w3fdif" stands for "Weston 3 Field
- Deinterlacing Filter").
- </p>
- <p>Based on the process described by Martin Weston for BBC R&D, and
- implemented based on the de-interlace algorithm written by Jim
- Easterbrook for BBC R&D, the Weston 3 field deinterlacing filter
- uses filter coefficients calculated by BBC R&D.
- </p>
- <p>This filter uses field-dominance information in frame to decide which
- of each pair of fields to place first in the output.
- If it gets it wrong use <a class="ref" href="#setfield">setfield</a> filter before <code class="code">w3fdif</code> filter.
- </p>
- <p>There are two sets of filter coefficients, so called "simple"
- and "complex". Which set of filter coefficients is used can
- be set by passing an optional parameter:
- </p>
- <dl class="table">
- <dt><samp class="option">filter</samp></dt>
- <dd><p>Set the interlacing filter coefficients. Accepts one of the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">simple</samp>’</dt>
- <dd><p>Simple filter coefficient set.
- </p></dd>
- <dt>‘<samp class="samp">complex</samp>’</dt>
- <dd><p>More-complex filter coefficient set.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">complex</samp>’.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">field</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">all</samp>’</dt>
- <dd><p>Deinterlace all frames,
- </p></dd>
- <dt>‘<samp class="samp">interlaced</samp>’</dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">all</samp>’.
- </p></dd>
- </dl>
- <a name="Commands-152"></a>
- <h4 class="subsection">39.278.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-152" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-152" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="waveform"></a>
- <h3 class="section">39.279 waveform<span class="pull-right"><a class="anchor hidden-xs" href="#waveform" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-waveform" aria-hidden="true">TOC</a></span></h3>
- <p>Video waveform monitor.
- </p>
- <p>The waveform monitor plots color component intensity. By default luma
- only. Each column of the waveform corresponds to a column of pixels in the
- source video.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Can be either <code class="code">row</code>, or <code class="code">column</code>. Default is <code class="code">column</code>.
- In row mode, the graph on the left side represents color component value 0 and
- the right side represents value = 255. In column mode, the top side represents
- color component value = 0 and bottom side represents value = 255.
- </p>
- </dd>
- <dt><samp class="option">intensity, i</samp></dt>
- <dd><p>Set intensity. Smaller values are useful to find out how many values of the same
- luminance are distributed across input rows/columns.
- Default value is <code class="code">0.04</code>. Allowed range is [0, 1].
- </p>
- </dd>
- <dt><samp class="option">mirror, r</samp></dt>
- <dd><p>Set mirroring mode. <code class="code">0</code> means unmirrored, <code class="code">1</code> means mirrored.
- In mirrored mode, higher values will be represented on the left
- side for <code class="code">row</code> mode and at the top for <code class="code">column</code> mode. Default is
- <code class="code">1</code> (mirrored).
- </p>
- </dd>
- <dt><samp class="option">display, d</samp></dt>
- <dd><p>Set display mode.
- It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">overlay</samp>’</dt>
- <dd><p>Presents information identical to that in the <code class="code">parade</code>, except
- that the graphs representing color components are superimposed directly
- over one another.
- </p>
- <p>This display mode makes it easier to spot relative differences or similarities
- in overlapping areas of the color components that are supposed to be identical,
- such as neutral whites, grays, or blacks.
- </p>
- </dd>
- <dt>‘<samp class="samp">stack</samp>’</dt>
- <dd><p>Display separate graph for the color components side by side in
- <code class="code">row</code> mode or one below the other in <code class="code">column</code> mode.
- </p>
- </dd>
- <dt>‘<samp class="samp">parade</samp>’</dt>
- <dd><p>Display separate graph for the color components side by side in
- <code class="code">column</code> mode or one below the other in <code class="code">row</code> mode.
- </p>
- <p>Using this display mode makes it easy to spot color casts in the highlights
- and shadows of an image, by comparing the contours of the top and the bottom
- graphs of each waveform. Since whites, grays, and blacks are characterized
- by exactly equal amounts of red, green, and blue, neutral areas of the picture
- should display three waveforms of roughly equal width/height. If not, the
- correction is easy to perform by making level adjustments the three waveforms.
- </p></dd>
- </dl>
- <p>Default is <code class="code">stack</code>.
- </p>
- </dd>
- <dt><samp class="option">components, c</samp></dt>
- <dd><p>Set which color components to display. Default is 1, which means only luma
- or red color component if input is in RGB colorspace. If is set for example to
- 7 it will display all 3 (if) available color components.
- </p>
- </dd>
- <dt><samp class="option">envelope, e</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No envelope, this is default.
- </p>
- </dd>
- <dt>‘<samp class="samp">instant</samp>’</dt>
- <dd><p>Instant envelope, minimum and maximum values presented in graph will be easily
- visible even with small <code class="code">step</code> value.
- </p>
- </dd>
- <dt>‘<samp class="samp">peak</samp>’</dt>
- <dd><p>Hold minimum and maximum values presented in graph across time. This way you
- can still spot out of range values without constantly looking at waveforms.
- </p>
- </dd>
- <dt>‘<samp class="samp">peak+instant</samp>’</dt>
- <dd><p>Peak and instant envelope combined together.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">filter, f</samp></dt>
- <dd><dl class="table">
- <dt>‘<samp class="samp">lowpass</samp>’</dt>
- <dd><p>No filtering, this is default.
- </p>
- </dd>
- <dt>‘<samp class="samp">flat</samp>’</dt>
- <dd><p>Luma and chroma combined together.
- </p>
- </dd>
- <dt>‘<samp class="samp">aflat</samp>’</dt>
- <dd><p>Similar as above, but shows difference between blue and red chroma.
- </p>
- </dd>
- <dt>‘<samp class="samp">xflat</samp>’</dt>
- <dd><p>Similar as above, but use different colors.
- </p>
- </dd>
- <dt>‘<samp class="samp">yflat</samp>’</dt>
- <dd><p>Similar as above, but again with different colors.
- </p>
- </dd>
- <dt>‘<samp class="samp">chroma</samp>’</dt>
- <dd><p>Displays only chroma.
- </p>
- </dd>
- <dt>‘<samp class="samp">color</samp>’</dt>
- <dd><p>Displays actual color value on waveform.
- </p>
- </dd>
- <dt>‘<samp class="samp">acolor</samp>’</dt>
- <dd><p>Similar as above, but with luma showing frequency of chroma values.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">graticule, g</samp></dt>
- <dd><p>Set which graticule to display.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Do not display graticule.
- </p>
- </dd>
- <dt>‘<samp class="samp">green</samp>’</dt>
- <dd><p>Display green graticule showing legal broadcast ranges.
- </p>
- </dd>
- <dt>‘<samp class="samp">orange</samp>’</dt>
- <dd><p>Display orange graticule showing legal broadcast ranges.
- </p>
- </dd>
- <dt>‘<samp class="samp">invert</samp>’</dt>
- <dd><p>Display invert graticule showing legal broadcast ranges.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">opacity, o</samp></dt>
- <dd><p>Set graticule opacity.
- </p>
- </dd>
- <dt><samp class="option">flags, fl</samp></dt>
- <dd><p>Set graticule flags.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">numbers</samp>’</dt>
- <dd><p>Draw numbers above lines. By default enabled.
- </p>
- </dd>
- <dt>‘<samp class="samp">dots</samp>’</dt>
- <dd><p>Draw dots instead of lines.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">scale, s</samp></dt>
- <dd><p>Set scale used for displaying graticule.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">digital</samp>’</dt>
- <dt>‘<samp class="samp">millivolts</samp>’</dt>
- <dt>‘<samp class="samp">ire</samp>’</dt>
- </dl>
- <p>Default is digital.
- </p>
- </dd>
- <dt><samp class="option">bgopacity, b</samp></dt>
- <dd><p>Set background opacity.
- </p>
- </dd>
- <dt><samp class="option">tint0, t0</samp></dt>
- <dt><samp class="option">tint1, t1</samp></dt>
- <dd><p>Set tint for output.
- Only used with lowpass filter and when display is not overlay and input
- pixel formats are not RGB.
- </p>
- </dd>
- <dt><samp class="option">fitmode, fm</samp></dt>
- <dd><p>Set sample aspect ratio of video output frames.
- Can be used to configure waveform so it is not
- stretched too much in one of directions.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Set sample aspect ration to 1/1.
- </p></dd>
- <dt>‘<samp class="samp">size</samp>’</dt>
- <dd><p>Set sample aspect ratio to match input size of video
- </p></dd>
- </dl>
- <p>Default is ‘<samp class="samp">none</samp>’.
- </p>
- </dd>
- <dt><samp class="option">input</samp></dt>
- <dd><p>Set input formats for filter to pick from.
- Can be ‘<samp class="samp">all</samp>’, for selecting from all available formats,
- or ‘<samp class="samp">first</samp>’, for selecting first available format.
- Default is ‘<samp class="samp">first</samp>’.
- </p></dd>
- </dl>
- <a name="weave_002c-doubleweave"></a>
- <h3 class="section">39.280 weave, doubleweave<span class="pull-right"><a class="anchor hidden-xs" href="#weave_002c-doubleweave" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-weave_002c-doubleweave" aria-hidden="true">TOC</a></span></h3>
- <p>The <code class="code">weave</code> takes a field-based video input and join
- each two sequential fields into single frame, producing a new double
- height clip with half the frame rate and half the frame count.
- </p>
- <p>The <code class="code">doubleweave</code> works same as <code class="code">weave</code> but without
- halving frame rate and frame count.
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">first_field</samp></dt>
- <dd><p>Set first field. Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">top, t</samp>’</dt>
- <dd><p>Set the frame as top-field-first.
- </p>
- </dd>
- <dt>‘<samp class="samp">bottom, b</samp>’</dt>
- <dd><p>Set the frame as bottom-field-first.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-182"></a>
- <h4 class="subsection">39.280.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-182" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-182" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Interlace video using <a class="ref" href="#select">select</a> and <a class="ref" href="#separatefields">separatefields</a> filter:
- <div class="example">
- <pre class="example-preformatted">separatefields,select=eq(mod(n,4),0)+eq(mod(n,4),3),weave
- </pre></div>
- </li></ul>
- <a name="xbr"></a>
- <h3 class="section">39.281 xbr<span class="pull-right"><a class="anchor hidden-xs" href="#xbr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xbr" aria-hidden="true">TOC</a></span></h3>
- <p>Apply the xBR high-quality magnification filter which is designed for pixel
- art. It follows a set of edge-detection rules, see
- <a class="url" href="https://forums.libretro.com/t/xbr-algorithm-tutorial/123">https://forums.libretro.com/t/xbr-algorithm-tutorial/123</a>.
- </p>
- <p>It accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the scaling dimension: <code class="code">2</code> for <code class="code">2xBR</code>, <code class="code">3</code> for
- <code class="code">3xBR</code> and <code class="code">4</code> for <code class="code">4xBR</code>.
- Default is <code class="code">3</code>.
- </p></dd>
- </dl>
- <a name="xcorrelate"></a>
- <h3 class="section">39.282 xcorrelate<span class="pull-right"><a class="anchor hidden-xs" href="#xcorrelate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xcorrelate" aria-hidden="true">TOC</a></span></h3>
- <p>Apply normalized cross-correlation between first and second input video stream.
- </p>
- <p>Second input video stream dimensions must be lower than first input video stream.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to process.
- </p>
- </dd>
- <dt><samp class="option">secondary</samp></dt>
- <dd><p>Set which secondary video frames will be processed from second input video stream,
- can be <var class="var">first</var> or <var class="var">all</var>. Default is <var class="var">all</var>.
- </p></dd>
- </dl>
- <p>The <code class="code">xcorrelate</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="xfade"></a>
- <h3 class="section">39.283 xfade<span class="pull-right"><a class="anchor hidden-xs" href="#xfade" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xfade" aria-hidden="true">TOC</a></span></h3>
- <p>Apply cross fade from one input video stream to another input video stream.
- The cross fade is applied for specified duration.
- </p>
- <p>Both inputs must be constant frame-rate and have the same resolution, pixel format,
- frame rate and timebase.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">transition</samp></dt>
- <dd><p>Set one of available transition effects:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">custom</samp>’</dt>
- <dt>‘<samp class="samp">fade</samp>’</dt>
- <dt>‘<samp class="samp">wipeleft</samp>’</dt>
- <dt>‘<samp class="samp">wiperight</samp>’</dt>
- <dt>‘<samp class="samp">wipeup</samp>’</dt>
- <dt>‘<samp class="samp">wipedown</samp>’</dt>
- <dt>‘<samp class="samp">slideleft</samp>’</dt>
- <dt>‘<samp class="samp">slideright</samp>’</dt>
- <dt>‘<samp class="samp">slideup</samp>’</dt>
- <dt>‘<samp class="samp">slidedown</samp>’</dt>
- <dt>‘<samp class="samp">circlecrop</samp>’</dt>
- <dt>‘<samp class="samp">rectcrop</samp>’</dt>
- <dt>‘<samp class="samp">distance</samp>’</dt>
- <dt>‘<samp class="samp">fadeblack</samp>’</dt>
- <dt>‘<samp class="samp">fadewhite</samp>’</dt>
- <dt>‘<samp class="samp">radial</samp>’</dt>
- <dt>‘<samp class="samp">smoothleft</samp>’</dt>
- <dt>‘<samp class="samp">smoothright</samp>’</dt>
- <dt>‘<samp class="samp">smoothup</samp>’</dt>
- <dt>‘<samp class="samp">smoothdown</samp>’</dt>
- <dt>‘<samp class="samp">circleopen</samp>’</dt>
- <dt>‘<samp class="samp">circleclose</samp>’</dt>
- <dt>‘<samp class="samp">vertopen</samp>’</dt>
- <dt>‘<samp class="samp">vertclose</samp>’</dt>
- <dt>‘<samp class="samp">horzopen</samp>’</dt>
- <dt>‘<samp class="samp">horzclose</samp>’</dt>
- <dt>‘<samp class="samp">dissolve</samp>’</dt>
- <dt>‘<samp class="samp">pixelize</samp>’</dt>
- <dt>‘<samp class="samp">diagtl</samp>’</dt>
- <dt>‘<samp class="samp">diagtr</samp>’</dt>
- <dt>‘<samp class="samp">diagbl</samp>’</dt>
- <dt>‘<samp class="samp">diagbr</samp>’</dt>
- <dt>‘<samp class="samp">hlslice</samp>’</dt>
- <dt>‘<samp class="samp">hrslice</samp>’</dt>
- <dt>‘<samp class="samp">vuslice</samp>’</dt>
- <dt>‘<samp class="samp">vdslice</samp>’</dt>
- <dt>‘<samp class="samp">hblur</samp>’</dt>
- <dt>‘<samp class="samp">fadegrays</samp>’</dt>
- <dt>‘<samp class="samp">wipetl</samp>’</dt>
- <dt>‘<samp class="samp">wipetr</samp>’</dt>
- <dt>‘<samp class="samp">wipebl</samp>’</dt>
- <dt>‘<samp class="samp">wipebr</samp>’</dt>
- <dt>‘<samp class="samp">squeezeh</samp>’</dt>
- <dt>‘<samp class="samp">squeezev</samp>’</dt>
- <dt>‘<samp class="samp">zoomin</samp>’</dt>
- <dt>‘<samp class="samp">fadefast</samp>’</dt>
- <dt>‘<samp class="samp">fadeslow</samp>’</dt>
- <dt>‘<samp class="samp">hlwind</samp>’</dt>
- <dt>‘<samp class="samp">hrwind</samp>’</dt>
- <dt>‘<samp class="samp">vuwind</samp>’</dt>
- <dt>‘<samp class="samp">vdwind</samp>’</dt>
- <dt>‘<samp class="samp">coverleft</samp>’</dt>
- <dt>‘<samp class="samp">coverright</samp>’</dt>
- <dt>‘<samp class="samp">coverup</samp>’</dt>
- <dt>‘<samp class="samp">coverdown</samp>’</dt>
- <dt>‘<samp class="samp">revealleft</samp>’</dt>
- <dt>‘<samp class="samp">revealright</samp>’</dt>
- <dt>‘<samp class="samp">revealup</samp>’</dt>
- <dt>‘<samp class="samp">revealdown</samp>’</dt>
- </dl>
- <p>Default transition effect is fade.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>Set cross fade duration in seconds.
- Range is 0 to 60 seconds.
- Default duration is 1 second.
- </p>
- </dd>
- <dt><samp class="option">offset</samp></dt>
- <dd><p>Set cross fade start relative to first input stream in seconds.
- Default offset is 0.
- </p>
- </dd>
- <dt><samp class="option">expr</samp></dt>
- <dd><p>Set expression for custom transition effect.
- </p>
- <p>The expressions can use the following variables and functions:
- </p>
- <dl class="table">
- <dt><samp class="option">X</samp></dt>
- <dt><samp class="option">Y</samp></dt>
- <dd><p>The coordinates of the current sample.
- </p>
- </dd>
- <dt><samp class="option">W</samp></dt>
- <dt><samp class="option">H</samp></dt>
- <dd><p>The width and height of the image.
- </p>
- </dd>
- <dt><samp class="option">P</samp></dt>
- <dd><p>Progress of transition effect.
- </p>
- </dd>
- <dt><samp class="option">PLANE</samp></dt>
- <dd><p>Currently processed plane.
- </p>
- </dd>
- <dt><samp class="option">A</samp></dt>
- <dd><p>Return value of first input at current location and plane.
- </p>
- </dd>
- <dt><samp class="option">B</samp></dt>
- <dd><p>Return value of second input at current location and plane.
- </p>
- </dd>
- <dt><samp class="option">a0(x, y)</samp></dt>
- <dt><samp class="option">a1(x, y)</samp></dt>
- <dt><samp class="option">a2(x, y)</samp></dt>
- <dt><samp class="option">a3(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the
- first/second/third/fourth component of first input.
- </p>
- </dd>
- <dt><samp class="option">b0(x, y)</samp></dt>
- <dt><samp class="option">b1(x, y)</samp></dt>
- <dt><samp class="option">b2(x, y)</samp></dt>
- <dt><samp class="option">b3(x, y)</samp></dt>
- <dd><p>Return the value of the pixel at location (<var class="var">x</var>,<var class="var">y</var>) of the
- first/second/third/fourth component of second input.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-183"></a>
- <h4 class="subsection">39.283.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-183" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-183" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Cross fade from one input video to another input video, with fade transition and duration of transition
- of 2 seconds starting at offset of 5 seconds:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i first.mp4 -i second.mp4 -filter_complex xfade=transition=fade:duration=2:offset=5 output.mp4
- </pre></div>
- </li></ul>
- <a name="xmedian"></a>
- <h3 class="section">39.284 xmedian<span class="pull-right"><a class="anchor hidden-xs" href="#xmedian" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xmedian" aria-hidden="true">TOC</a></span></h3>
- <p>Pick median pixels from several input videos.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set number of inputs.
- Default is 3. Allowed range is from 3 to 255.
- If number of inputs is even number, than result will be mean value between two median values.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">15</code>, by which all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">percentile</samp></dt>
- <dd><p>Set median percentile. Default value is <code class="code">0.5</code>.
- Default value of <code class="code">0.5</code> will pick always median values, while <code class="code">0</code> will pick
- minimum values, and <code class="code">1</code> maximum values.
- </p></dd>
- </dl>
- <a name="Commands-153"></a>
- <h4 class="subsection">39.284.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-153" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-153" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports all above options as <a class="ref" href="#commands">commands</a>, excluding option <code class="code">inputs</code>.
- </p>
- <a class="anchor" id="xpsnr"></a><a name="xpsnr-1"></a>
- <h3 class="section">39.285 xpsnr<span class="pull-right"><a class="anchor hidden-xs" href="#xpsnr-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xpsnr-1" aria-hidden="true">TOC</a></span></h3>
- <p>Obtain the average (across all input frames) and minimum (across all color plane averages)
- eXtended Perceptually weighted peak Signal-to-Noise Ratio (XPSNR) between two input videos.
- </p>
- <p>The XPSNR is a low-complexity psychovisually motivated distortion measurement algorithm for
- assessing the difference between two video streams or images. This is especially useful for
- objectively quantifying the distortions caused by video and image codecs, as an alternative
- to a formal subjective test. The logarithmic XPSNR output values are in a similar range as
- those of traditional <a class="ref" href="#psnr">psnr</a> assessments but better reflect human impressions of visual
- coding quality. More details on the XPSNR measure, which essentially represents a blockwise
- weighted variant of the PSNR measure, can be found in the following freely available papers:
- </p>
- <ul class="itemize mark-bullet">
- <li>C. R. Helmrich, M. Siekmann, S. Becker, S. Bosse, D. Marpe, and T. Wiegand, "XPSNR: A
- Low-Complexity Extension of the Perceptually Weighted Peak Signal-to-Noise Ratio for
- High-Resolution Video Quality Assessment," in Proc. IEEE Int. Conf. Acoustics, Speech,
- Sig. Process. (ICASSP), virt./online, May 2020. <a class="url" href="www.ecodis.de/xpsnr.htm">www.ecodis.de/xpsnr.htm</a>
- </li><li>C. R. Helmrich, S. Bosse, H. Schwarz, D. Marpe, and T. Wiegand, "A Study of the
- Extended Perceptually Weighted Peak Signal-to-Noise Ratio (XPSNR) for Video Compression
- with Different Resolutions and Bit Depths," ITU Journal: ICT Discoveries, vol. 3, no.
- 1, pp. 65 - 72, May 2020. <a class="url" href="http://handle.itu.int/11.1002/pub/8153d78b-en">http://handle.itu.int/11.1002/pub/8153d78b-en</a>
- </li></ul>
- <p>When publishing the results of XPSNR assessments obtained using, e.g., this FFmpeg filter, a
- reference to the above papers as a means of documentation is strongly encouraged. The filter
- requires two input videos. The first input is considered a (usually not distorted) reference
- source and is passed unchanged to the output, whereas the second input is a (distorted) test
- signal. Except for the bit depth, these two video inputs must have the same pixel format. In
- addition, for best performance, both compared input videos should be in YCbCr color format.
- </p>
- <p>The obtained overall XPSNR values mentioned above are printed through the logging system. In
- case of input with multiple color planes, we suggest reporting of the minimum XPSNR average.
- </p>
- <p>The following parameter, which behaves like the one for the <a class="ref" href="#psnr">psnr</a> filter, is accepted:
- </p>
- <dl class="table">
- <dt><samp class="option">stats_file, f</samp></dt>
- <dd><p>If specified, the filter will use the named file to save the XPSNR value of each individual
- frame and color plane. When the file name equals "-", that data is sent to standard output.
- </p></dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a name="Examples-184"></a>
- <h4 class="subsection">39.285.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-184" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-184" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>XPSNR analysis of two 1080p HD videos, ref_source.yuv and test_video.yuv, both at 24 frames
- per second, with color format 4:2:0, bit depth 8, and output of a logfile named "xpsnr.log":
- <div class="example">
- <pre class="example-preformatted">ffmpeg -s 1920x1080 -framerate 24 -pix_fmt yuv420p -i ref_source.yuv -s 1920x1080 -framerate
- 24 -pix_fmt yuv420p -i test_video.yuv -lavfi xpsnr="stats_file=xpsnr.log" -f null -
- </pre></div>
- </li><li>XPSNR analysis of two 2160p UHD videos, ref_source.yuv with bit depth 8 and test_video.yuv
- with bit depth 10, both at 60 frames per second with color format 4:2:0, no logfile output:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -s 3840x2160 -framerate 60 -pix_fmt yuv420p -i ref_source.yuv -s 3840x2160 -framerate
- 60 -pix_fmt yuv420p10le -i test_video.yuv -lavfi xpsnr="stats_file=-" -f null -
- </pre></div>
- </li></ul>
- <a class="anchor" id="xstack"></a><a name="xstack-1"></a>
- <h3 class="section">39.286 xstack<span class="pull-right"><a class="anchor hidden-xs" href="#xstack-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xstack-1" aria-hidden="true">TOC</a></span></h3>
- <p>Stack video inputs into custom layout.
- </p>
- <p>All streams must be of same pixel format.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Set number of input streams. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">layout</samp></dt>
- <dd><p>Specify layout of inputs.
- This option requires the desired layout configuration to be explicitly set by the user.
- This sets position of each video input in output. Each input
- is separated by ’|’.
- The first number represents the column, and the second number represents the row.
- Numbers start at 0 and are separated by ’_’. Optionally one can use wX and hX,
- where X is video input from which to take width or height.
- Multiple values can be used when separated by ’+’. In such
- case values are summed together.
- </p>
- <p>Note that if inputs are of different sizes gaps may appear, as not all of
- the output video frame will be filled. Similarly, videos can overlap each
- other if their position doesn’t leave enough space for the full frame of
- adjoining videos.
- </p>
- <p>For 2 inputs, a default layout of <code class="code">0_0|w0_0</code> (equivalent to
- <code class="code">grid=2x1</code>) is set. In all other cases, a layout or a grid must be set by
- the user. Either <code class="code">grid</code> or <code class="code">layout</code> can be specified at a time.
- Specifying both will result in an error.
- </p>
- </dd>
- <dt><samp class="option">grid</samp></dt>
- <dd><p>Specify a fixed size grid of inputs.
- This option is used to create a fixed size grid of the input streams. Set the
- grid size in the form <code class="code">COLUMNSxROWS</code>. There must be <code class="code">ROWS * COLUMNS</code>
- input streams and they will be arranged as a grid with <code class="code">ROWS</code> rows and
- <code class="code">COLUMNS</code> columns. When using this option, each input stream within a row
- must have the same height and all the rows must have the same width.
- </p>
- <p>If <code class="code">grid</code> is set, then <code class="code">inputs</code> option is ignored and is implicitly
- set to <code class="code">ROWS * COLUMNS</code>.
- </p>
- <p>For 2 inputs, a default grid of <code class="code">2x1</code> (equivalent to
- <code class="code">layout=0_0|w0_0</code>) is set. In all other cases, a layout or a grid must be
- set by the user. Either <code class="code">grid</code> or <code class="code">layout</code> can be specified at a time.
- Specifying both will result in an error.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>If set to 1, force the output to terminate when the shortest input
- terminates. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>If set to valid color, all unused pixels will be filled with that color.
- By default fill is set to none, so it is disabled.
- </p></dd>
- </dl>
- <a name="Examples-185"></a>
- <h4 class="subsection">39.286.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-185" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-185" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Display 4 inputs into 2x2 grid.
- <p>Layout:
- </p><div class="example">
- <pre class="example-preformatted">input1(0, 0) | input3(w0, 0)
- input2(0, h0) | input4(w0, h0)
- </pre></div>
- <div class="example">
- <pre class="example-preformatted">xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0
- </pre></div>
- <p>Note that if inputs are of different sizes, gaps or overlaps may occur.
- </p>
- </li><li>Display 4 inputs into 1x4 grid.
- <p>Layout:
- </p><div class="example">
- <pre class="example-preformatted">input1(0, 0)
- input2(0, h0)
- input3(0, h0+h1)
- input4(0, h0+h1+h2)
- </pre></div>
- <div class="example">
- <pre class="example-preformatted">xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
- </pre></div>
- <p>Note that if inputs are of different widths, unused space will appear.
- </p>
- </li><li>Display 9 inputs into 3x3 grid.
- <p>Layout:
- </p><div class="example">
- <pre class="example-preformatted">input1(0, 0) | input4(w0, 0) | input7(w0+w3, 0)
- input2(0, h0) | input5(w0, h0) | input8(w0+w3, h0)
- input3(0, h0+h1) | input6(w0, h0+h1) | input9(w0+w3, h0+h1)
- </pre></div>
- <div class="example">
- <pre class="example-preformatted">xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w3_0|w0+w3_h0|w0+w3_h0+h1
- </pre></div>
- <p>Note that if inputs are of different sizes, gaps or overlaps may occur.
- </p>
- </li><li>Display 16 inputs into 4x4 grid.
- <p>Layout:
- </p><div class="example">
- <pre class="example-preformatted">input1(0, 0) | input5(w0, 0) | input9 (w0+w4, 0) | input13(w0+w4+w8, 0)
- input2(0, h0) | input6(w0, h0) | input10(w0+w4, h0) | input14(w0+w4+w8, h0)
- input3(0, h0+h1) | input7(w0, h0+h1) | input11(w0+w4, h0+h1) | input15(w0+w4+w8, h0+h1)
- input4(0, h0+h1+h2)| input8(w0, h0+h1+h2)| input12(w0+w4, h0+h1+h2)| input16(w0+w4+w8, h0+h1+h2)
- </pre></div>
- <div class="example">
- <pre class="example-preformatted">xstack=inputs=16:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2|w0_0|w0_h0|w0_h0+h1|w0_h0+h1+h2|w0+w4_0|
- w0+w4_h0|w0+w4_h0+h1|w0+w4_h0+h1+h2|w0+w4+w8_0|w0+w4+w8_h0|w0+w4+w8_h0+h1|w0+w4+w8_h0+h1+h2
- </pre></div>
- <p>Note that if inputs are of different sizes, gaps or overlaps may occur.
- </p>
- </li></ul>
- <a class="anchor" id="yadif"></a><a name="yadif-1"></a>
- <h3 class="section">39.287 yadif<span class="pull-right"><a class="anchor hidden-xs" href="#yadif-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-yadif-1" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlace the input video ("yadif" means "yet another deinterlacing
- filter").
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, send_frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">1, send_field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- <dt><samp class="option">2, send_frame_nospatial</samp></dt>
- <dd><p>Like <code class="code">send_frame</code>, but it skips the spatial interlacing check.
- </p></dd>
- <dt><samp class="option">3, send_field_nospatial</samp></dt>
- <dd><p>Like <code class="code">send_field</code>, but it skips the spatial interlacing check.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">send_frame</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">1, bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">-1, auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following
- values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, all</samp></dt>
- <dd><p>Deinterlace all frames.
- </p></dd>
- <dt><samp class="option">1, interlaced</samp></dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">all</code>.
- </p></dd>
- </dl>
- <a name="yaepblur"></a>
- <h3 class="section">39.288 yaepblur<span class="pull-right"><a class="anchor hidden-xs" href="#yaepblur" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-yaepblur" aria-hidden="true">TOC</a></span></h3>
- <p>Apply blur filter while preserving edges ("yaepblur" means "yet another edge preserving blur filter").
- The algorithm is described in
- "J. S. Lee, Digital image enhancement and noise filtering by use of local statistics, IEEE Trans. Pattern Anal. Mach. Intell. PAMI-2, 1980."
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">radius, r</samp></dt>
- <dd><p>Set the window radius. Default value is 3.
- </p>
- </dd>
- <dt><samp class="option">planes, p</samp></dt>
- <dd><p>Set which planes to filter. Default is only the first plane.
- </p>
- </dd>
- <dt><samp class="option">sigma, s</samp></dt>
- <dd><p>Set blur strength. Default value is 128.
- </p></dd>
- </dl>
- <a name="Commands-154"></a>
- <h4 class="subsection">39.288.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-154" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-154" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports same <a class="ref" href="#commands">commands</a> as options.
- </p>
- <a name="zoompan"></a>
- <h3 class="section">39.289 zoompan<span class="pull-right"><a class="anchor hidden-xs" href="#zoompan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-zoompan" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Zoom & Pan effect.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">zoom, z</samp></dt>
- <dd><p>Set the zoom expression. Range is 1-10. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set the x and y expression. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">d</samp></dt>
- <dd><p>Set the duration expression in number of frames.
- This sets for how many number of frames effect will last for
- single input image. Default is 90.
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set the output image size, default is ’hd720’.
- </p>
- </dd>
- <dt><samp class="option">fps</samp></dt>
- <dd><p>Set the output frame rate, default is ’25’.
- </p></dd>
- </dl>
- <p>Each expression can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">in_w, iw</samp></dt>
- <dd><p>Input width.
- </p>
- </dd>
- <dt><samp class="option">in_h, ih</samp></dt>
- <dd><p>Input height.
- </p>
- </dd>
- <dt><samp class="option">out_w, ow</samp></dt>
- <dd><p>Output width.
- </p>
- </dd>
- <dt><samp class="option">out_h, oh</samp></dt>
- <dd><p>Output height.
- </p>
- </dd>
- <dt><samp class="option">in</samp></dt>
- <dd><p>Input frame count.
- </p>
- </dd>
- <dt><samp class="option">on</samp></dt>
- <dd><p>Output frame count.
- </p>
- </dd>
- <dt><samp class="option">in_time, it</samp></dt>
- <dd><p>The input timestamp expressed in seconds. It’s NAN if the input timestamp is unknown.
- </p>
- </dd>
- <dt><samp class="option">out_time, time, ot</samp></dt>
- <dd><p>The output timestamp expressed in seconds.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Last calculated ’x’ and ’y’ position from ’x’ and ’y’ expression
- for current input frame.
- </p>
- </dd>
- <dt><samp class="option">px</samp></dt>
- <dt><samp class="option">py</samp></dt>
- <dd><p>’x’ and ’y’ of last output frame of previous input frame or 0 when there was
- not yet such frame (first input frame).
- </p>
- </dd>
- <dt><samp class="option">zoom</samp></dt>
- <dd><p>Last calculated zoom from ’z’ expression for current input frame.
- </p>
- </dd>
- <dt><samp class="option">pzoom</samp></dt>
- <dd><p>Last calculated zoom of last output frame of previous input frame.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>Number of output frames for current input frame. Calculated from ’d’ expression
- for each input frame.
- </p>
- </dd>
- <dt><samp class="option">pduration</samp></dt>
- <dd><p>number of output frames created for previous input frame
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>Rational number: input width / input height
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>display aspect ratio
- </p>
- </dd>
- </dl>
- <a name="Examples-186"></a>
- <h4 class="subsection">39.289.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-186" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-186" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Zoom in up to 1.5x and pan at same time to some spot near center of picture:
- <div class="example">
- <pre class="example-preformatted">zoompan=z='min(zoom+0.0015,1.5)':d=700:x='if(gte(zoom,1.5),x,x+1/a)':y='if(gte(zoom,1.5),y,y+1)':s=640x360
- </pre></div>
- </li><li>Zoom in up to 1.5x and pan always at center of picture:
- <div class="example">
- <pre class="example-preformatted">zoompan=z='min(zoom+0.0015,1.5)':d=700:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
- </pre></div>
- </li><li>Same as above but without pausing:
- <div class="example">
- <pre class="example-preformatted">zoompan=z='min(max(zoom,pzoom)+0.0015,1.5)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
- </pre></div>
- </li><li>Zoom in 2x into center of picture only for the first second of the input video:
- <div class="example">
- <pre class="example-preformatted">zoompan=z='if(between(in_time,0,1),2,1)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
- </pre></div>
- </li></ul>
- <a class="anchor" id="zscale"></a><a name="zscale-1"></a>
- <h3 class="section">39.290 zscale<span class="pull-right"><a class="anchor hidden-xs" href="#zscale-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-zscale-1" aria-hidden="true">TOC</a></span></h3>
- <p>Scale (resize) the input video, using the z.lib library:
- <a class="url" href="https://github.com/sekrit-twc/zimg">https://github.com/sekrit-twc/zimg</a>. To enable compilation of this
- filter, you need to configure FFmpeg with <code class="code">--enable-libzimg</code>.
- </p>
- <p>The zscale filter forces the output display aspect ratio to be the same
- as the input, by changing the output sample aspect ratio.
- </p>
- <p>If the input image format is different from the format requested by
- the next filter, the zscale filter will convert the input to the
- requested format.
- </p>
- <a name="Options-125"></a>
- <h4 class="subsection">39.290.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-125" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-125" aria-hidden="true">TOC</a></span></h4>
- <p>The filter accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Set the output video dimension expression. Default value is the input
- dimension.
- </p>
- <p>If the <var class="var">width</var> or <var class="var">w</var> value is 0, the input width is used for
- the output. If the <var class="var">height</var> or <var class="var">h</var> value is 0, the input height
- is used for the output.
- </p>
- <p>If one and only one of the values is -n with n >= 1, the zscale filter
- will use a value that maintains the aspect ratio of the input image,
- calculated from the other specified dimension. After that it will,
- however, make sure that the calculated dimension is divisible by n and
- adjust the value if necessary.
- </p>
- <p>If both values are -n with n >= 1, the behavior will be identical to
- both values being set to 0 as previously detailed.
- </p>
- <p>See below for the list of accepted constants for use in the dimension
- expression.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set the video size. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">dither, d</samp></dt>
- <dd><p>Set the dither type.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">none</var></dt>
- <dt><var class="var">ordered</var></dt>
- <dt><var class="var">random</var></dt>
- <dt><var class="var">error_diffusion</var></dt>
- </dl>
- <p>Default is none.
- </p>
- </dd>
- <dt><samp class="option">filter, f</samp></dt>
- <dd><p>Set the resize filter type.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">point</var></dt>
- <dt><var class="var">bilinear</var></dt>
- <dt><var class="var">bicubic</var></dt>
- <dt><var class="var">spline16</var></dt>
- <dt><var class="var">spline36</var></dt>
- <dt><var class="var">spline64</var></dt>
- <dt><var class="var">lanczos</var></dt>
- </dl>
- <p>Default is bilinear.
- </p>
- </dd>
- <dt><samp class="option">range, r</samp></dt>
- <dd><p>Set the color range.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">limited</var></dt>
- <dt><var class="var">full</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">primaries, p</samp></dt>
- <dd><p>Set the color primaries.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">709</var></dt>
- <dt><var class="var">unspecified</var></dt>
- <dt><var class="var">170m</var></dt>
- <dt><var class="var">240m</var></dt>
- <dt><var class="var">2020</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">transfer, t</samp></dt>
- <dd><p>Set the transfer characteristics.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">709</var></dt>
- <dt><var class="var">unspecified</var></dt>
- <dt><var class="var">601</var></dt>
- <dt><var class="var">linear</var></dt>
- <dt><var class="var">2020_10</var></dt>
- <dt><var class="var">2020_12</var></dt>
- <dt><var class="var">smpte2084</var></dt>
- <dt><var class="var">iec61966-2-1</var></dt>
- <dt><var class="var">arib-std-b67</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">matrix, m</samp></dt>
- <dd><p>Set the colorspace matrix.
- </p>
- <p>Possible value are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">709</var></dt>
- <dt><var class="var">unspecified</var></dt>
- <dt><var class="var">470bg</var></dt>
- <dt><var class="var">170m</var></dt>
- <dt><var class="var">2020_ncl</var></dt>
- <dt><var class="var">2020_cl</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">rangein, rin</samp></dt>
- <dd><p>Set the input color range.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">limited</var></dt>
- <dt><var class="var">full</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">primariesin, pin</samp></dt>
- <dd><p>Set the input color primaries.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">709</var></dt>
- <dt><var class="var">unspecified</var></dt>
- <dt><var class="var">170m</var></dt>
- <dt><var class="var">240m</var></dt>
- <dt><var class="var">2020</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">transferin, tin</samp></dt>
- <dd><p>Set the input transfer characteristics.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">709</var></dt>
- <dt><var class="var">unspecified</var></dt>
- <dt><var class="var">601</var></dt>
- <dt><var class="var">linear</var></dt>
- <dt><var class="var">2020_10</var></dt>
- <dt><var class="var">2020_12</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">matrixin, min</samp></dt>
- <dd><p>Set the input colorspace matrix.
- </p>
- <p>Possible value are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">709</var></dt>
- <dt><var class="var">unspecified</var></dt>
- <dt><var class="var">470bg</var></dt>
- <dt><var class="var">170m</var></dt>
- <dt><var class="var">2020_ncl</var></dt>
- <dt><var class="var">2020_cl</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">chromal, c</samp></dt>
- <dd><p>Set the output chroma location.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">left</var></dt>
- <dt><var class="var">center</var></dt>
- <dt><var class="var">topleft</var></dt>
- <dt><var class="var">top</var></dt>
- <dt><var class="var">bottomleft</var></dt>
- <dt><var class="var">bottom</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">chromalin, cin</samp></dt>
- <dd><p>Set the input chroma location.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">input</var></dt>
- <dt><var class="var">left</var></dt>
- <dt><var class="var">center</var></dt>
- <dt><var class="var">topleft</var></dt>
- <dt><var class="var">top</var></dt>
- <dt><var class="var">bottomleft</var></dt>
- <dt><var class="var">bottom</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">npl</samp></dt>
- <dd><p>Set the nominal peak luminance.
- </p>
- </dd>
- <dt><samp class="option">param_a</samp></dt>
- <dd><p>Parameter A for scaling filters. Parameter "b" for bicubic, and the number of
- filter taps for lanczos.
- </p>
- </dd>
- <dt><samp class="option">param_b</samp></dt>
- <dd><p>Parameter B for scaling filters. Parameter "c" for bicubic.
- </p></dd>
- </dl>
- <p>The values of the <samp class="option">w</samp> and <samp class="option">h</samp> options are expressions
- containing the following constants:
- </p>
- <dl class="table">
- <dt><var class="var">in_w</var></dt>
- <dt><var class="var">in_h</var></dt>
- <dd><p>The input width and height
- </p>
- </dd>
- <dt><var class="var">iw</var></dt>
- <dt><var class="var">ih</var></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><var class="var">out_w</var></dt>
- <dt><var class="var">out_h</var></dt>
- <dd><p>The output (scaled) width and height
- </p>
- </dd>
- <dt><var class="var">ow</var></dt>
- <dt><var class="var">oh</var></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>
- </p>
- </dd>
- <dt><var class="var">a</var></dt>
- <dd><p>The same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><var class="var">sar</var></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><var class="var">dar</var></dt>
- <dd><p>The input display aspect ratio. Calculated from <code class="code">(iw / ih) * sar</code>.
- </p>
- </dd>
- <dt><var class="var">hsub</var></dt>
- <dt><var class="var">vsub</var></dt>
- <dd><p>horizontal and vertical input chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p>
- </dd>
- <dt><var class="var">ohsub</var></dt>
- <dt><var class="var">ovsub</var></dt>
- <dd><p>horizontal and vertical output chroma subsample values. For example for the
- pixel format "yuv422p" <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p></dd>
- </dl>
- <a name="Commands-155"></a>
- <h4 class="subsection">39.290.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-155" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-155" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Set the output video dimension expression.
- The command accepts the same syntax of the corresponding option.
- </p>
- <p>If the specified expression is not valid, it is kept at its current
- value.
- </p></dd>
- </dl>
- <a name="CUDA-Video-Filters"></a>
- <h2 class="chapter">40 CUDA Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#CUDA-Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-CUDA-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>To enable CUDA and/or NPP filters please refer to configuration guidelines for <a class="ref" href="#CUDA">CUDA</a> and for <a class="ref" href="#CUDA-NPP">CUDA NPP</a> filters.
- </p>
- <p>Running CUDA filters requires you to initialize a hardware device and to pass that device to all filters in any filter graph.
- </p><dl class="table">
- <dt><samp class="option">-init_hw_device cuda[=<var class="var">name</var>][:<var class="var">device</var>[,<var class="var">key=value</var>...]]</samp></dt>
- <dd><p>Initialise a new hardware device of type <var class="var">cuda</var> called <var class="var">name</var>, using the
- given device parameters.
- </p>
- </dd>
- <dt><samp class="option">-filter_hw_device <var class="var">name</var></samp></dt>
- <dd><p>Pass the hardware device called <var class="var">name</var> to all filters in any filter graph.
- </p>
- </dd>
- </dl>
- <p>For more detailed information see <a class="url" href="https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options">https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options</a>
- </p>
- <ul class="itemize mark-bullet">
- <li>Example of initializing second CUDA device on the system and running scale_cuda and bilateral_cuda filters.
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -init_hw_device cuda:1 -filter_complex \
- "[0:v]scale_cuda=format=yuv444p[scaled_video];[scaled_video]bilateral_cuda=window_size=9:sigmaS=3.0:sigmaR=50.0" \
- -an -sn -c:v h264_nvenc -cq 20 out.mp4
- </pre></div>
- </li></ul>
- <p>Since CUDA filters operate exclusively on GPU memory, frame data must sometimes be uploaded (<a class="ref" href="#hwupload">hwupload</a>) to hardware surfaces associated with the appropriate CUDA device before processing, and downloaded (<a class="ref" href="#hwdownload">hwdownload</a>) back to normal memory afterward, if required. Whether <a class="ref" href="#hwupload">hwupload</a> or <a class="ref" href="#hwdownload">hwdownload</a> is necessary depends on the specific workflow:
- </p>
- <ul class="itemize mark-bullet">
- <li>If the input frames are already in GPU memory (e.g., when using <code class="code">-hwaccel cuda</code> or <code class="code">-hwaccel_output_format cuda</code>), explicit use of <a class="ref" href="#hwupload">hwupload</a> is not needed, as the data is already in the appropriate memory space.
- </li><li>If the input frames are in CPU memory (e.g., software-decoded frames or frames processed by CPU-based filters), it is necessary to use <a class="ref" href="#hwupload">hwupload</a> to transfer the data to GPU memory for CUDA processing.
- </li><li>If the output of the CUDA filters needs to be further processed by software-based filters or saved in a format not supported by GPU-based encoders, <a class="ref" href="#hwdownload">hwdownload</a> is required to transfer the data back to CPU memory.
- </li></ul>
- <p>Note that <a class="ref" href="#hwupload">hwupload</a> uploads data to a surface with the same layout as the software frame, so it may be necessary to add a <a class="ref" href="#format">format</a> filter immediately before <a class="ref" href="#hwupload">hwupload</a> to ensure the input is in the correct format. Similarly, <a class="ref" href="#hwdownload">hwdownload</a> may not support all output formats, so an additional <a class="ref" href="#format">format</a> filter may need to be inserted immediately after <a class="ref" href="#hwdownload">hwdownload</a> in the filter graph to ensure compatibility.
- </p>
- <a class="anchor" id="CUDA"></a><a name="CUDA-1"></a>
- <h3 class="section">40.1 CUDA<span class="pull-right"><a class="anchor hidden-xs" href="#CUDA-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-CUDA-1" aria-hidden="true">TOC</a></span></h3>
- <p>Below is a description of the currently available Nvidia CUDA video filters.
- </p>
- <p>Prerequisites:
- </p><ul class="itemize mark-bullet">
- <li>Install Nvidia CUDA Toolkit
- </li></ul>
- <p>Note: If FFmpeg detects the Nvidia CUDA Toolkit during configuration, it will enable CUDA filters automatically without requiring any additional flags. If you want to explicitly enable them, use the following options:
- </p>
- <ul class="itemize mark-bullet">
- <li>Configure FFmpeg with <code class="code">--enable-cuda-nvcc --enable-nonfree</code>.
- </li><li>Configure FFmpeg with <code class="code">--enable-cuda-llvm</code>. Additional requirement: <code class="code">llvm</code> lib must be installed.
- </li></ul>
- <a name="bilateral_005fcuda"></a>
- <h4 class="subsection">40.1.1 bilateral_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#bilateral_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bilateral_005fcuda" aria-hidden="true">TOC</a></span></h4>
- <p>CUDA accelerated bilateral filter, an edge preserving filter.
- This filter is mathematically accurate thanks to the use of GPU acceleration.
- For best output quality, use one to one chroma subsampling, i.e. yuv444p format.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">sigmaS</samp></dt>
- <dd><p>Set sigma of gaussian function to calculate spatial weight, also called sigma space.
- Allowed range is 0.1 to 512. Default is 0.1.
- </p>
- </dd>
- <dt><samp class="option">sigmaR</samp></dt>
- <dd><p>Set sigma of gaussian function to calculate color range weight, also called sigma color.
- Allowed range is 0.1 to 512. Default is 0.1.
- </p>
- </dd>
- <dt><samp class="option">window_size</samp></dt>
- <dd><p>Set window size of the bilateral function to determine the number of neighbours to loop on.
- If the number entered is even, one will be added automatically.
- Allowed range is 1 to 255. Default is 1.
- </p></dd>
- </dl>
- <a name="Examples-187"></a>
- <h4 class="subsubsection">40.1.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-187" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-187" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply the bilateral filter on a video.
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -v verbose \
- -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 \
- -init_hw_device cuda \
- -filter_complex \
- " \
- [0:v]scale_cuda=format=yuv444p[scaled_video];
- [scaled_video]bilateral_cuda=window_size=9:sigmaS=3.0:sigmaR=50.0" \
- -an -sn -c:v h264_nvenc -cq 20 out.mp4
- </pre></div>
- </li></ul>
- <a name="bwdif_005fcuda"></a>
- <h4 class="subsection">40.1.2 bwdif_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#bwdif_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bwdif_005fcuda" aria-hidden="true">TOC</a></span></h4>
- <p>Deinterlace the input video using the <a class="ref" href="#bwdif">bwdif</a> algorithm, but implemented
- in CUDA so that it can work as part of a GPU accelerated pipeline with nvdec
- and/or nvenc.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, send_frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">1, send_field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">send_field</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">1, bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">-1, auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following
- values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, all</samp></dt>
- <dd><p>Deinterlace all frames.
- </p></dd>
- <dt><samp class="option">1, interlaced</samp></dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">all</code>.
- </p></dd>
- </dl>
- <a name="chromakey_005fcuda"></a>
- <h4 class="subsection">40.1.3 chromakey_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#chromakey_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromakey_005fcuda" aria-hidden="true">TOC</a></span></h4>
- <p>CUDA accelerated YUV colorspace color/chroma keying.
- </p>
- <p>This filter works like normal chromakey filter but operates on CUDA frames.
- for more details and parameters see <a class="ref" href="#chromakey">chromakey</a>.
- </p>
- <a name="Examples-188"></a>
- <h4 class="subsubsection">40.1.3.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-188" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-188" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make all the green pixels in the input video transparent and use it as an overlay for another video:
- <div class="example">
- <pre class="example-preformatted">./ffmpeg \
- -hwaccel cuda -hwaccel_output_format cuda -i input_green.mp4 \
- -hwaccel cuda -hwaccel_output_format cuda -i base_video.mp4 \
- -init_hw_device cuda \
- -filter_complex \
- " \
- [0:v]chromakey_cuda=0x25302D:0.1:0.12:1[overlay_video]; \
- [1:v]scale_cuda=format=yuv420p[base]; \
- [base][overlay_video]overlay_cuda" \
- -an -sn -c:v h264_nvenc -cq 20 output.mp4
- </pre></div>
- </li><li>Process two software sources, explicitly uploading the frames:
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -init_hw_device cuda=cuda -filter_hw_device cuda \
- -f lavfi -i color=size=800x600:color=white,format=yuv420p \
- -f lavfi -i yuvtestsrc=size=200x200,format=yuv420p \
- -filter_complex \
- " \
- [0]hwupload[under]; \
- [1]hwupload,chromakey_cuda=green:0.1:0.12[over]; \
- [under][over]overlay_cuda" \
- -c:v hevc_nvenc -cq 18 -preset slow output.mp4
- </pre></div>
- </li></ul>
- <a name="colorspace_005fcuda"></a>
- <h4 class="subsection">40.1.4 colorspace_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#colorspace_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorspace_005fcuda" aria-hidden="true">TOC</a></span></h4>
- <p>CUDA accelerated implementation of the colorspace filter.
- </p>
- <p>It is by no means feature complete compared to the software colorspace filter,
- and at the current time only supports color range conversion between jpeg/full
- and mpeg/limited range.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">range</samp></dt>
- <dd><p>Specify output color range.
- </p>
- <p>The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">tv</samp>’</dt>
- <dd><p>TV (restricted) range
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg</samp>’</dt>
- <dd><p>MPEG (restricted) range
- </p>
- </dd>
- <dt>‘<samp class="samp">pc</samp>’</dt>
- <dd><p>PC (full) range
- </p>
- </dd>
- <dt>‘<samp class="samp">jpeg</samp>’</dt>
- <dd><p>JPEG (full) range
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a class="anchor" id="overlay_005fcuda"></a><a name="overlay_005fcuda-1"></a>
- <h4 class="subsection">40.1.5 overlay_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#overlay_005fcuda-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-overlay_005fcuda-1" aria-hidden="true">TOC</a></span></h4>
- <p>Overlay one video on top of another.
- </p>
- <p>This is the CUDA variant of the <a class="ref" href="#overlay">overlay</a> filter.
- It only accepts CUDA frames. The underlying input pixel formats have to match.
- </p>
- <p>It takes two inputs and has one output. The first input is the "main"
- video on which the second input is overlaid.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set expressions for the x and y coordinates of the overlaid video
- on the main video.
- </p>
- <p>They can contain the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">main_w, W</samp></dt>
- <dt><samp class="option">main_h, H</samp></dt>
- <dd><p>The main input width and height.
- </p>
- </dd>
- <dt><samp class="option">overlay_w, w</samp></dt>
- <dt><samp class="option">overlay_h, h</samp></dt>
- <dd><p>The overlay input width and height.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The computed values for <var class="var">x</var> and <var class="var">y</var>. They are evaluated for
- each new frame.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>The ordinal index of the main input frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>The byte offset position in the file of the main input frame, NAN if unknown.
- Deprecated, do not use.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The timestamp of the main input frame, expressed in seconds, NAN if unknown.
- </p>
- </dd>
- </dl>
- <p>Default value is "0" for both expressions.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Set when the expressions for <samp class="option">x</samp> and <samp class="option">y</samp> are evaluated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt><samp class="option">init</samp></dt>
- <dd><p>Evaluate expressions once during filter initialization or
- when a command is processed.
- </p>
- </dd>
- <dt><samp class="option">frame</samp></dt>
- <dd><p>Evaluate expressions for each incoming frame
- </p></dd>
- </dl>
- <p>Default value is <samp class="option">frame</samp>.
- </p>
- </dd>
- <dt><samp class="option">eof_action</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">repeatlast</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <a class="anchor" id="pad_005fcuda"></a><a name="pad_005fcuda-1"></a>
- <h4 class="subsection">40.1.6 pad_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#pad_005fcuda-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pad_005fcuda-1" aria-hidden="true">TOC</a></span></h4>
- <p>Add paddings to an input video stream using CUDA.
- </p>
- <p>This filter is the CUDA-accelerated version of the <a class="ref" href="#pad">pad</a> filter. It accepts the same options and expressions and provides the same core functionality.
- For a detailed description of available options, please see the documentation for the <a class="ref" href="#pad">pad</a> filter.
- </p>
- <a name="Examples-189"></a>
- <h4 class="subsubsection">40.1.6.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-189" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-189" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Add a 200-pixel black border to all sides of a video frame:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -vf "pad_cuda=w=iw+400:h=ih+400:x=200:y=200" -c:v h264_nvenc out.mp4
- </pre></div>
- </li><li>Pad the input video to a 16:9 aspect ratio, filling with the color "blue":
- <div class="example">
- <pre class="example-preformatted">ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -vf "pad_cuda=w=ih*16/9/sar:h=ih:x=(ow-iw)/2:y=(oh-ih)/2:color=blue" -c:v h264_nvenc out.mp4
- </pre></div>
- </li></ul>
- <a class="anchor" id="scale_005fcuda"></a><a name="scale_005fcuda-1"></a>
- <h4 class="subsection">40.1.7 scale_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#scale_005fcuda-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scale_005fcuda-1" aria-hidden="true">TOC</a></span></h4>
- <p>Scale (resize) and convert (pixel format) the input video, using accelerated CUDA kernels.
- Setting the output width and height works in the same way as for the <a class="ref" href="#scale">scale</a> filter.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the output video dimension expression. Default value is the input dimension.
- </p>
- <p>Allows for the same expressions as the <a class="ref" href="#scale">scale</a> filter.
- </p>
- </dd>
- <dt><samp class="option">interp_algo</samp></dt>
- <dd><p>Sets the algorithm used for scaling:
- </p>
- <dl class="table">
- <dt><var class="var">nearest</var></dt>
- <dd><p>Nearest neighbour
- </p>
- <p>Used by default if input parameters match the desired output.
- </p>
- </dd>
- <dt><var class="var">bilinear</var></dt>
- <dd><p>Bilinear
- </p>
- </dd>
- <dt><var class="var">bicubic</var></dt>
- <dd><p>Bicubic
- </p>
- <p>This is the default.
- </p>
- </dd>
- <dt><var class="var">lanczos</var></dt>
- <dd><p>Lanczos
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Controls the output pixel format. By default, or if none is specified, the input
- pixel format is used.
- </p>
- <p>The filter does not support converting between YUV and RGB pixel formats.
- </p>
- </dd>
- <dt><samp class="option">passthrough</samp></dt>
- <dd><p>If set to 0, every frame is processed, even if no conversion is necessary.
- This mode can be useful to use the filter as a buffer for a downstream
- frame-consumer that exhausts the limited decoder frame pool.
- </p>
- <p>If set to 1, frames are passed through as-is if they match the desired output
- parameters. This is the default behaviour.
- </p>
- </dd>
- <dt><samp class="option">param</samp></dt>
- <dd><p>Algorithm-Specific parameter.
- </p>
- <p>Affects the curves of the bicubic algorithm.
- </p>
- </dd>
- <dt><samp class="option">force_original_aspect_ratio</samp></dt>
- <dt><samp class="option">force_divisible_by</samp></dt>
- <dd><p>Work the same as the identical <a class="ref" href="#scale">scale</a> filter options.
- </p>
- </dd>
- <dt><samp class="option">reset_sar</samp></dt>
- <dd><p>Works the same as the identical <a class="ref" href="#scale">scale</a> filter option.
- </p>
- </dd>
- </dl>
- <a name="Examples-190"></a>
- <h4 class="subsubsection">40.1.7.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-190" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-190" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Scale input to 720p, keeping aspect ratio and ensuring the output is yuv420p.
- <div class="example">
- <pre class="example-preformatted">scale_cuda=-2:720:format=yuv420p
- </pre></div>
- </li><li>Upscale to 4K using nearest neighbour algorithm.
- <div class="example">
- <pre class="example-preformatted">scale_cuda=4096:2160:interp_algo=nearest
- </pre></div>
- </li><li>Don’t do any conversion or scaling, but copy all input frames into newly allocated ones.
- This can be useful to deal with a filter and encode chain that otherwise exhausts the
- decoders frame pool.
- <div class="example">
- <pre class="example-preformatted">scale_cuda=passthrough=0
- </pre></div>
- </li></ul>
- <a name="thumbnail_005fcuda"></a>
- <h4 class="subsection">40.1.8 thumbnail_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#thumbnail_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-thumbnail_005fcuda" aria-hidden="true">TOC</a></span></h4>
- <p>Select the most representative frame in a given sequence of consecutive frames using CUDA.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the frames batch size to analyze; in a set of <var class="var">n</var> frames, the filter
- will pick one of them, and then handle the next batch of <var class="var">n</var> frames until
- the end. Default is <code class="code">100</code>.
- </p></dd>
- </dl>
- <p>Since the filter keeps track of the whole frames sequence, a bigger <var class="var">n</var>
- value will result in a higher memory usage, so a high value is not recommended.
- </p>
- <a name="Example-11"></a>
- <h4 class="subsubsection">40.1.8.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-11" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-11" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Thumbnails are extracted from every <var class="var">n</var>=150-frame batch, selecting one per batch. Chosen frames are then scaled with <a class="ref" href="#scale_005fcuda">scale_cuda</a>.
- <div class="example">
- <pre class="example-preformatted">./ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i ./input.mp4 -vf "thumbnail_cuda=150,scale_cuda=1920:1080,hwdownload,format=nv12" ./output/out%03d.png
- </pre></div>
- </li></ul>
- <a name="yadif_005fcuda"></a>
- <h4 class="subsection">40.1.9 yadif_cuda<span class="pull-right"><a class="anchor hidden-xs" href="#yadif_005fcuda" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-yadif_005fcuda" aria-hidden="true">TOC</a></span></h4>
- <p>Deinterlace the input video using the <a class="ref" href="#yadif">yadif</a> algorithm, but implemented
- in CUDA so that it can work as part of a GPU accelerated pipeline with nvdec
- and/or nvenc.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, send_frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">1, send_field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- <dt><samp class="option">2, send_frame_nospatial</samp></dt>
- <dd><p>Like <code class="code">send_frame</code>, but it skips the spatial interlacing check.
- </p></dd>
- <dt><samp class="option">3, send_field_nospatial</samp></dt>
- <dd><p>Like <code class="code">send_field</code>, but it skips the spatial interlacing check.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">send_frame</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">1, bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">-1, auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following
- values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, all</samp></dt>
- <dd><p>Deinterlace all frames.
- </p></dd>
- <dt><samp class="option">1, interlaced</samp></dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">all</code>.
- </p></dd>
- </dl>
- <a class="anchor" id="CUDA-NPP"></a><a name="CUDA-NPP-1"></a>
- <h3 class="section">40.2 CUDA NPP<span class="pull-right"><a class="anchor hidden-xs" href="#CUDA-NPP-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-CUDA-NPP-1" aria-hidden="true">TOC</a></span></h3>
- <p>Below is a description of the currently available NVIDIA Performance Primitives (libnpp) video filters.
- </p>
- <p>Prerequisites:
- </p><ul class="itemize mark-bullet">
- <li>Install Nvidia CUDA Toolkit
- </li><li>Install libnpp
- </li></ul>
- <p>To enable CUDA NPP filters:
- </p>
- <ul class="itemize mark-bullet">
- <li>Configure FFmpeg with <code class="code">--enable-nonfree --enable-libnpp</code>.
- </li></ul>
- <a class="anchor" id="scale_005fnpp"></a><a name="scale_005fnpp-1"></a>
- <h4 class="subsection">40.2.1 scale_npp<span class="pull-right"><a class="anchor hidden-xs" href="#scale_005fnpp-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scale_005fnpp-1" aria-hidden="true">TOC</a></span></h4>
- <p>Use the NVIDIA Performance Primitives (libnpp) to perform scaling and/or pixel
- format conversion on CUDA video frames. Setting the output width and height
- works in the same way as for the <var class="var">scale</var> filter.
- </p>
- <p>The following additional options are accepted:
- </p><dl class="table">
- <dt><samp class="option">format</samp></dt>
- <dd><p>The pixel format of the output CUDA frames. If set to the string "same" (the
- default), the input format will be kept. Note that automatic format negotiation
- and conversion is not yet supported for hardware frames
- </p>
- </dd>
- <dt><samp class="option">interp_algo</samp></dt>
- <dd><p>The interpolation algorithm used for resizing. One of the following:
- </p><dl class="table">
- <dt><samp class="option">nn</samp></dt>
- <dd><p>Nearest neighbour.
- </p>
- </dd>
- <dt><samp class="option">linear</samp></dt>
- <dt><samp class="option">cubic</samp></dt>
- <dt><samp class="option">cubic2p_bspline</samp></dt>
- <dd><p>2-parameter cubic (B=1, C=0)
- </p>
- </dd>
- <dt><samp class="option">cubic2p_catmullrom</samp></dt>
- <dd><p>2-parameter cubic (B=0, C=1/2)
- </p>
- </dd>
- <dt><samp class="option">cubic2p_b05c03</samp></dt>
- <dd><p>2-parameter cubic (B=1/2, C=3/10)
- </p>
- </dd>
- <dt><samp class="option">super</samp></dt>
- <dd><p>Supersampling
- </p>
- </dd>
- <dt><samp class="option">lanczos</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">force_original_aspect_ratio</samp></dt>
- <dd><p>Enable decreasing or increasing output video width or height if necessary to
- keep the original aspect ratio. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">disable</samp>’</dt>
- <dd><p>Scale the video as specified and disable this feature.
- </p>
- </dd>
- <dt>‘<samp class="samp">decrease</samp>’</dt>
- <dd><p>The output video dimensions will automatically be decreased if needed.
- </p>
- </dd>
- <dt>‘<samp class="samp">increase</samp>’</dt>
- <dd><p>The output video dimensions will automatically be increased if needed.
- </p>
- </dd>
- </dl>
- <p>One useful instance of this option is that when you know a specific device’s
- maximum allowed resolution, you can use this to limit the output video to
- that, while retaining the aspect ratio. For example, device A allows
- 1280x720 playback, and your video is 1920x800. Using this option (set it to
- decrease) and specifying 1280x720 to the command line makes the output
- 1280x533.
- </p>
- <p>Please note that this is a different thing than specifying -1 for <samp class="option">w</samp>
- or <samp class="option">h</samp>, you still need to specify the output resolution for this option
- to work.
- </p>
- </dd>
- <dt><samp class="option">force_divisible_by</samp></dt>
- <dd><p>Ensures that both the output dimensions, width and height, are divisible by the
- given integer when used together with <samp class="option">force_original_aspect_ratio</samp>. This
- works similar to using <code class="code">-n</code> in the <samp class="option">w</samp> and <samp class="option">h</samp> options.
- </p>
- <p>This option respects the value set for <samp class="option">force_original_aspect_ratio</samp>,
- increasing or decreasing the resolution accordingly. The video’s aspect ratio
- may be slightly modified.
- </p>
- <p>This option can be handy if you need to have a video fit within or exceed
- a defined resolution using <samp class="option">force_original_aspect_ratio</samp> but also have
- encoder restrictions on width or height divisibility.
- </p>
- </dd>
- <dt><samp class="option">reset_sar</samp></dt>
- <dd><p>Works the same as the identical <a class="ref" href="#scale">scale</a> filter option.
- </p>
- </dd>
- <dt><samp class="option">eval</samp></dt>
- <dd><p>Specify when to evaluate <var class="var">width</var> and <var class="var">height</var> expression. It accepts the following values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">init</samp>’</dt>
- <dd><p>Only evaluate expressions once during the filter initialization or when a command is processed.
- </p>
- </dd>
- <dt>‘<samp class="samp">frame</samp>’</dt>
- <dd><p>Evaluate expressions for each incoming frame.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <p>The values of the <samp class="option">w</samp> and <samp class="option">h</samp> options are expressions
- containing the following constants:
- </p>
- <dl class="table">
- <dt><var class="var">in_w</var></dt>
- <dt><var class="var">in_h</var></dt>
- <dd><p>The input width and height
- </p>
- </dd>
- <dt><var class="var">iw</var></dt>
- <dt><var class="var">ih</var></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><var class="var">out_w</var></dt>
- <dt><var class="var">out_h</var></dt>
- <dd><p>The output (scaled) width and height
- </p>
- </dd>
- <dt><var class="var">ow</var></dt>
- <dt><var class="var">oh</var></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>
- </p>
- </dd>
- <dt><var class="var">a</var></dt>
- <dd><p>The same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><var class="var">sar</var></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><var class="var">dar</var></dt>
- <dd><p>The input display aspect ratio. Calculated from <code class="code">(iw / ih) * sar</code>.
- </p>
- </dd>
- <dt><var class="var">n</var></dt>
- <dd><p>The (sequential) number of the input frame, starting from 0.
- Only available with <code class="code">eval=frame</code>.
- </p>
- </dd>
- <dt><var class="var">t</var></dt>
- <dd><p>The presentation timestamp of the input frame, expressed as a number of
- seconds. Only available with <code class="code">eval=frame</code>.
- </p>
- </dd>
- <dt><var class="var">pos</var></dt>
- <dd><p>The position (byte offset) of the frame in the input stream, or NaN if
- this information is unavailable and/or meaningless (for example in case of synthetic video).
- Only available with <code class="code">eval=frame</code>.
- Deprecated, do not use.
- </p></dd>
- </dl>
- <a name="scale2ref_005fnpp"></a>
- <h4 class="subsection">40.2.2 scale2ref_npp<span class="pull-right"><a class="anchor hidden-xs" href="#scale2ref_005fnpp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scale2ref_005fnpp" aria-hidden="true">TOC</a></span></h4>
- <p>Use the NVIDIA Performance Primitives (libnpp) to scale (resize) the input
- video, based on a reference video.
- </p>
- <p>See the <a class="ref" href="#scale_005fnpp">scale_npp</a> filter for available options, scale2ref_npp supports the same
- but uses the reference video instead of the main input as basis. scale2ref_npp
- also supports the following additional constants for the <samp class="option">w</samp> and
- <samp class="option">h</samp> options:
- </p>
- <dl class="table">
- <dt><var class="var">main_w</var></dt>
- <dt><var class="var">main_h</var></dt>
- <dd><p>The main input video’s width and height
- </p>
- </dd>
- <dt><var class="var">main_a</var></dt>
- <dd><p>The same as <var class="var">main_w</var> / <var class="var">main_h</var>
- </p>
- </dd>
- <dt><var class="var">main_sar</var></dt>
- <dd><p>The main input video’s sample aspect ratio
- </p>
- </dd>
- <dt><var class="var">main_dar, mdar</var></dt>
- <dd><p>The main input video’s display aspect ratio. Calculated from
- <code class="code">(main_w / main_h) * main_sar</code>.
- </p>
- </dd>
- <dt><var class="var">main_n</var></dt>
- <dd><p>The (sequential) number of the main input frame, starting from 0.
- Only available with <code class="code">eval=frame</code>.
- </p>
- </dd>
- <dt><var class="var">main_t</var></dt>
- <dd><p>The presentation timestamp of the main input frame, expressed as a number of
- seconds. Only available with <code class="code">eval=frame</code>.
- </p>
- </dd>
- <dt><var class="var">main_pos</var></dt>
- <dd><p>The position (byte offset) of the frame in the main input stream, or NaN if
- this information is unavailable and/or meaningless (for example in case of synthetic video).
- Only available with <code class="code">eval=frame</code>.
- </p></dd>
- </dl>
- <a name="Examples-191"></a>
- <h4 class="subsubsection">40.2.2.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-191" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-191" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Scale a subtitle stream (b) to match the main video (a) in size before overlaying
- <div class="example">
- <pre class="example-preformatted">'scale2ref_npp[b][a];[a][b]overlay_cuda'
- </pre></div>
- </li><li>Scale a logo to 1/10th the height of a video, while preserving its display aspect ratio.
- <div class="example">
- <pre class="example-preformatted">[logo-in][video-in]scale2ref_npp=w=oh*mdar:h=ih/10[logo-out][video-out]
- </pre></div>
- </li></ul>
- <a name="sharpen_005fnpp"></a>
- <h4 class="subsection">40.2.3 sharpen_npp<span class="pull-right"><a class="anchor hidden-xs" href="#sharpen_005fnpp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sharpen_005fnpp" aria-hidden="true">TOC</a></span></h4>
- <p>Use the NVIDIA Performance Primitives (libnpp) to perform image sharpening with
- border control.
- </p>
- <p>The following additional options are accepted:
- </p><dl class="table">
- <dt><samp class="option">border_type</samp></dt>
- <dd><p>Type of sampling to be used ad frame borders. One of the following:
- </p><dl class="table">
- <dt><samp class="option">replicate</samp></dt>
- <dd><p>Replicate pixel values.
- </p>
- </dd>
- </dl>
- </dd>
- </dl>
- <a name="transpose_005fnpp"></a>
- <h4 class="subsection">40.2.4 transpose_npp<span class="pull-right"><a class="anchor hidden-xs" href="#transpose_005fnpp" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-transpose_005fnpp" aria-hidden="true">TOC</a></span></h4>
- <p>Transpose rows with columns in the input video and optionally flip it.
- For more in depth examples see the <a class="ref" href="#transpose">transpose</a> video filter, which shares mostly the same options.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">dir</samp></dt>
- <dd><p>Specify the transposition direction.
- </p>
- <p>Can assume the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">cclock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise and vertically flip. (default)
- </p>
- </dd>
- <dt>‘<samp class="samp">clock</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">cclock</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">clock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise and vertically flip.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">passthrough</samp></dt>
- <dd><p>Do not apply the transposition if the input geometry matches the one
- specified by the specified value. It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Always apply transposition. (default)
- </p></dd>
- <dt>‘<samp class="samp">portrait</samp>’</dt>
- <dd><p>Preserve portrait geometry (when <var class="var">height</var> >= <var class="var">width</var>).
- </p></dd>
- <dt>‘<samp class="samp">landscape</samp>’</dt>
- <dd><p>Preserve landscape geometry (when <var class="var">width</var> >= <var class="var">height</var>).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="OpenCL-Video-Filters"></a>
- <h2 class="chapter">41 OpenCL Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#OpenCL-Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-OpenCL-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available OpenCL video filters.
- </p>
- <p>To enable compilation of these filters you need to configure FFmpeg with
- <code class="code">--enable-opencl</code>.
- </p>
- <p>Running OpenCL filters requires you to initialize a hardware device and to pass that device to all filters in any filter graph.
- </p><dl class="table">
- <dt><samp class="option">-init_hw_device opencl[=<var class="var">name</var>][:<var class="var">device</var>[,<var class="var">key=value</var>...]]</samp></dt>
- <dd><p>Initialise a new hardware device of type <var class="var">opencl</var> called <var class="var">name</var>, using the
- given device parameters.
- </p>
- </dd>
- <dt><samp class="option">-filter_hw_device <var class="var">name</var></samp></dt>
- <dd><p>Pass the hardware device called <var class="var">name</var> to all filters in any filter graph.
- </p>
- </dd>
- </dl>
- <p>For more detailed information see <a class="url" href="https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options">https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options</a>
- </p>
- <ul class="itemize mark-bullet">
- <li>Example of choosing the first device on the second platform and running avgblur_opencl filter with default parameters on it.
- <div class="example">
- <pre class="example-preformatted">-init_hw_device opencl=gpu:1.0 -filter_hw_device gpu -i INPUT -vf "hwupload, avgblur_opencl, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <p>Since OpenCL filters are not able to access frame data in normal memory, all frame data needs to be uploaded(<a class="ref" href="#hwupload">hwupload</a>) to hardware surfaces connected to the appropriate device before being used and then downloaded(<a class="ref" href="#hwdownload">hwdownload</a>) back to normal memory. Note that <a class="ref" href="#hwupload">hwupload</a> will upload to a surface with the same layout as the software frame, so it may be necessary to add a <a class="ref" href="#format">format</a> filter immediately before to get the input into the right format and <a class="ref" href="#hwdownload">hwdownload</a> does not support all formats on the output - it may be necessary to insert an additional <a class="ref" href="#format">format</a> filter immediately following in the graph to get the output in a supported format.
- </p>
- <a name="avgblur_005fopencl"></a>
- <h3 class="section">41.1 avgblur_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#avgblur_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avgblur_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply average blur filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sizeX</samp></dt>
- <dd><p>Set horizontal radius size.
- Range is <code class="code">[1, 1024]</code> and default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">0xf</code>, by which all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">sizeY</samp></dt>
- <dd><p>Set vertical radius size. Range is <code class="code">[1, 1024]</code> and default value is <code class="code">0</code>. If zero, <code class="code">sizeX</code> value will be used.
- </p></dd>
- </dl>
- <a name="Example-12"></a>
- <h4 class="subsection">41.1.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-12" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-12" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply average blur filter with horizontal and vertical size of 3, setting each pixel of the output to the average value of the 7x7 region centered on it in the input. For pixels on the edges of the image, the region does not extend beyond the image boundaries, and so out-of-range coordinates are not used in the calculations.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, avgblur_opencl=3, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="boxblur_005fopencl"></a>
- <h3 class="section">41.2 boxblur_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#boxblur_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-boxblur_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply a boxblur algorithm to the input video.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_radius, lr</samp></dt>
- <dt><samp class="option">luma_power, lp</samp></dt>
- <dt><samp class="option">chroma_radius, cr</samp></dt>
- <dt><samp class="option">chroma_power, cp</samp></dt>
- <dt><samp class="option">alpha_radius, ar</samp></dt>
- <dt><samp class="option">alpha_power, ap</samp></dt>
- </dl>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">luma_radius, lr</samp></dt>
- <dt><samp class="option">chroma_radius, cr</samp></dt>
- <dt><samp class="option">alpha_radius, ar</samp></dt>
- <dd><p>Set an expression for the box radius in pixels used for blurring the
- corresponding input plane.
- </p>
- <p>The radius value must be a non-negative number, and must not be
- greater than the value of the expression <code class="code">min(w,h)/2</code> for the
- luma and alpha planes, and of <code class="code">min(cw,ch)/2</code> for the chroma
- planes.
- </p>
- <p>Default value for <samp class="option">luma_radius</samp> is "2". If not specified,
- <samp class="option">chroma_radius</samp> and <samp class="option">alpha_radius</samp> default to the
- corresponding value set for <samp class="option">luma_radius</samp>.
- </p>
- <p>The expressions can contain the following constants:
- </p><dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The input width and height in pixels.
- </p>
- </dd>
- <dt><samp class="option">cw</samp></dt>
- <dt><samp class="option">ch</samp></dt>
- <dd><p>The input chroma image width and height in pixels.
- </p>
- </dd>
- <dt><samp class="option">hsub</samp></dt>
- <dt><samp class="option">vsub</samp></dt>
- <dd><p>The horizontal and vertical chroma subsample values. For example, for the
- pixel format "yuv422p", <var class="var">hsub</var> is 2 and <var class="var">vsub</var> is 1.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">luma_power, lp</samp></dt>
- <dt><samp class="option">chroma_power, cp</samp></dt>
- <dt><samp class="option">alpha_power, ap</samp></dt>
- <dd><p>Specify how many times the boxblur filter is applied to the
- corresponding plane.
- </p>
- <p>Default value for <samp class="option">luma_power</samp> is 2. If not specified,
- <samp class="option">chroma_power</samp> and <samp class="option">alpha_power</samp> default to the
- corresponding value set for <samp class="option">luma_power</samp>.
- </p>
- <p>A value of 0 will disable the effect.
- </p></dd>
- </dl>
- <a name="Examples-192"></a>
- <h4 class="subsection">41.2.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-192" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-192" aria-hidden="true">TOC</a></span></h4>
- <p>Apply boxblur filter, setting each pixel of the output to the average value of box-radiuses <var class="var">luma_radius</var>, <var class="var">chroma_radius</var>, <var class="var">alpha_radius</var> for each plane respectively. The filter will apply <var class="var">luma_power</var>, <var class="var">chroma_power</var>, <var class="var">alpha_power</var> times onto the corresponding plane. For pixels on the edges of the image, the radius does not extend beyond the image boundaries, and so out-of-range coordinates are not used in the calculations.
- </p>
- <ul class="itemize mark-bullet">
- <li>Apply a boxblur filter with the luma, chroma, and alpha radius
- set to 2 and luma, chroma, and alpha power set to 3. The filter will run 3 times with box-radius set to 2 for every plane of the image.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, boxblur_opencl=luma_radius=2:luma_power=3, hwdownload" OUTPUT
- -i INPUT -vf "hwupload, boxblur_opencl=2:3, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply a boxblur filter with luma radius set to 2, luma_power to 1, chroma_radius to 4, chroma_power to 5, alpha_radius to 3 and alpha_power to 7.
- <p>For the luma plane, a 2x2 box radius will be run once.
- </p>
- <p>For the chroma plane, a 4x4 box radius will be run 5 times.
- </p>
- <p>For the alpha plane, a 3x3 box radius will be run 7 times.
- </p><div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, boxblur_opencl=2:1:4:5:3:7, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="colorkey_005fopencl"></a>
- <h3 class="section">41.3 colorkey_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#colorkey_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-colorkey_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>RGB colorspace color keying.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>The color which will be replaced with transparency.
- </p>
- </dd>
- <dt><samp class="option">similarity</samp></dt>
- <dd><p>Similarity percentage with the key color.
- </p>
- <p>0.01 matches only the exact key color, while 1.0 matches everything.
- </p>
- </dd>
- <dt><samp class="option">blend</samp></dt>
- <dd><p>Blend percentage.
- </p>
- <p>0.0 makes pixels either fully transparent, or not transparent at all.
- </p>
- <p>Higher values result in semi-transparent pixels, with a higher transparency
- the more similar the pixels color is to the key color.
- </p></dd>
- </dl>
- <a name="Examples-193"></a>
- <h4 class="subsection">41.3.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-193" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-193" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Make every semi-green pixel in the input transparent with some slight blending:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, colorkey_opencl=green:0.3:0.1, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="convolution_005fopencl"></a>
- <h3 class="section">41.4 convolution_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#convolution_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-convolution_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply convolution of 3x3, 5x5, 7x7 matrix.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">0m</samp></dt>
- <dt><samp class="option">1m</samp></dt>
- <dt><samp class="option">2m</samp></dt>
- <dt><samp class="option">3m</samp></dt>
- <dd><p>Set matrix for each plane.
- Matrix is sequence of 9, 25 or 49 signed numbers.
- Default value for each plane is <code class="code">0 0 0 0 1 0 0 0 0</code>.
- </p>
- </dd>
- <dt><samp class="option">0rdiv</samp></dt>
- <dt><samp class="option">1rdiv</samp></dt>
- <dt><samp class="option">2rdiv</samp></dt>
- <dt><samp class="option">3rdiv</samp></dt>
- <dd><p>Set multiplier for calculated value for each plane.
- If unset or 0, it will be sum of all matrix elements.
- The option value must be a float number greater or equal to <code class="code">0.0</code>. Default value is <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">0bias</samp></dt>
- <dt><samp class="option">1bias</samp></dt>
- <dt><samp class="option">2bias</samp></dt>
- <dt><samp class="option">3bias</samp></dt>
- <dd><p>Set bias for each plane. This value is added to the result of the multiplication.
- Useful for making the overall image brighter or darker.
- The option value must be a float number greater or equal to <code class="code">0.0</code>. Default value is <code class="code">0.0</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-194"></a>
- <h4 class="subsection">41.4.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-194" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-194" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply sharpen:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, convolution_opencl=0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply blur:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, convolution_opencl=1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply edge enhance:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, convolution_opencl=0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply edge detect:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, convolution_opencl=0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply laplacian edge detector which includes diagonals:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, convolution_opencl=1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply emboss:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, convolution_opencl=-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="erosion_005fopencl"></a>
- <h3 class="section">41.5 erosion_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#erosion_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-erosion_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply erosion effect to the video.
- </p>
- <p>This filter replaces the pixel by the local(3x3) minimum.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold0</samp></dt>
- <dt><samp class="option">threshold1</samp></dt>
- <dt><samp class="option">threshold2</samp></dt>
- <dt><samp class="option">threshold3</samp></dt>
- <dd><p>Limit the maximum change for each plane. Range is <code class="code">[0, 65535]</code> and default value is <code class="code">65535</code>.
- If <code class="code">0</code>, plane will remain unchanged.
- </p>
- </dd>
- <dt><samp class="option">coordinates</samp></dt>
- <dd><p>Flag which specifies the pixel to refer to.
- Range is <code class="code">[0, 255]</code> and default value is <code class="code">255</code>, i.e. all eight pixels are used.
- </p>
- <p>Flags to local 3x3 coordinates region centered on <code class="code">x</code>:
- </p>
- <p>1 2 3
- </p>
- <p>4 x 5
- </p>
- <p>6 7 8
- </p></dd>
- </dl>
- <a name="Example-13"></a>
- <h4 class="subsection">41.5.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-13" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-13" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply erosion filter with threshold0 set to 30, threshold1 set 40, threshold2 set to 50 and coordinates set to 231, setting each pixel of the output to the local minimum between pixels: 1, 2, 3, 6, 7, 8 of the 3x3 region centered on it in the input. If the difference between input pixel and local minimum is more then threshold of the corresponding plane, output pixel will be set to input pixel - threshold of corresponding plane.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, erosion_opencl=30:40:50:coordinates=231, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="deshake_005fopencl"></a>
- <h3 class="section">41.6 deshake_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#deshake_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-deshake_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Feature-point based video stabilization filter.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">tripod</samp></dt>
- <dd><p>Simulates a tripod by preventing any camera movement whatsoever from the original frame. Defaults to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">debug</samp></dt>
- <dd><p>Whether or not additional debug info should be displayed, both in the processed output and in the console.
- </p>
- <p>Note that in order to see console debug output you will also need to pass <code class="code">-v verbose</code> to ffmpeg.
- </p>
- <p>Viewing point matches in the output video is only supported for RGB input.
- </p>
- <p>Defaults to <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">adaptive_crop</samp></dt>
- <dd><p>Whether or not to do a tiny bit of cropping at the borders to cut down on the amount of mirrored pixels.
- </p>
- <p>Defaults to <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">refine_features</samp></dt>
- <dd><p>Whether or not feature points should be refined at a sub-pixel level.
- </p>
- <p>This can be turned off for a slight performance gain at the cost of precision.
- </p>
- <p>Defaults to <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">smooth_strength</samp></dt>
- <dd><p>The strength of the smoothing applied to the camera path from <code class="code">0.0</code> to <code class="code">1.0</code>.
- </p>
- <p><code class="code">1.0</code> is the maximum smoothing strength while values less than that result in less smoothing.
- </p>
- <p><code class="code">0.0</code> causes the filter to adaptively choose a smoothing strength on a per-frame basis.
- </p>
- <p>Defaults to <code class="code">0.0</code>.
- </p>
- </dd>
- <dt><samp class="option">smooth_window_multiplier</samp></dt>
- <dd><p>Controls the size of the smoothing window (the number of frames buffered to determine motion information from).
- </p>
- <p>The size of the smoothing window is determined by multiplying the framerate of the video by this number.
- </p>
- <p>Acceptable values range from <code class="code">0.1</code> to <code class="code">10.0</code>.
- </p>
- <p>Larger values increase the amount of motion data available for determining how to smooth the camera path,
- potentially improving smoothness, but also increase latency and memory usage.
- </p>
- <p>Defaults to <code class="code">2.0</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-195"></a>
- <h4 class="subsection">41.6.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-195" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-195" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Stabilize a video with a fixed, medium smoothing strength:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, deshake_opencl=smooth_strength=0.5, hwdownload" OUTPUT
- </pre></div>
- </li><li>Stabilize a video with debugging (both in console and in rendered video):
- <div class="example">
- <pre class="example-preformatted">-i INPUT -filter_complex "[0:v]format=rgba, hwupload, deshake_opencl=debug=1, hwdownload, format=rgba, format=yuv420p" -v verbose OUTPUT
- </pre></div>
- </li></ul>
- <a name="dilation_005fopencl"></a>
- <h3 class="section">41.7 dilation_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#dilation_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dilation_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply dilation effect to the video.
- </p>
- <p>This filter replaces the pixel by the local(3x3) maximum.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">threshold0</samp></dt>
- <dt><samp class="option">threshold1</samp></dt>
- <dt><samp class="option">threshold2</samp></dt>
- <dt><samp class="option">threshold3</samp></dt>
- <dd><p>Limit the maximum change for each plane. Range is <code class="code">[0, 65535]</code> and default value is <code class="code">65535</code>.
- If <code class="code">0</code>, plane will remain unchanged.
- </p>
- </dd>
- <dt><samp class="option">coordinates</samp></dt>
- <dd><p>Flag which specifies the pixel to refer to.
- Range is <code class="code">[0, 255]</code> and default value is <code class="code">255</code>, i.e. all eight pixels are used.
- </p>
- <p>Flags to local 3x3 coordinates region centered on <code class="code">x</code>:
- </p>
- <p>1 2 3
- </p>
- <p>4 x 5
- </p>
- <p>6 7 8
- </p></dd>
- </dl>
- <a name="Example-14"></a>
- <h4 class="subsection">41.7.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-14" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-14" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply dilation filter with threshold0 set to 30, threshold1 set 40, threshold2 set to 50 and coordinates set to 231, setting each pixel of the output to the local maximum between pixels: 1, 2, 3, 6, 7, 8 of the 3x3 region centered on it in the input. If the difference between input pixel and local maximum is more then threshold of the corresponding plane, output pixel will be set to input pixel + threshold of corresponding plane.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, dilation_opencl=30:40:50:coordinates=231, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a class="anchor" id="nlmeans_005fopencl"></a><a name="nlmeans_005fopencl-1"></a>
- <h3 class="section">41.8 nlmeans_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#nlmeans_005fopencl-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-nlmeans_005fopencl-1" aria-hidden="true">TOC</a></span></h3>
- <p>Non-local Means denoise filter through OpenCL, this filter accepts same options as <a class="ref" href="#nlmeans">nlmeans</a>.
- </p>
- <a name="overlay_005fopencl"></a>
- <h3 class="section">41.9 overlay_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#overlay_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-overlay_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Overlay one video on top of another.
- </p>
- <p>It takes two inputs and has one output. The first input is the "main" video on which the second input is overlaid.
- This filter requires same memory layout for all the inputs. So, format conversion may be needed.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set the x coordinate of the overlaid video on the main video.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set the y coordinate of the overlaid video on the main video.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-196"></a>
- <h4 class="subsection">41.9.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-196" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-196" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Overlay an image LOGO at the top-left corner of the INPUT video. Both inputs are yuv420p format.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuv420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
- </pre></div>
- </li><li>The inputs have same memory layout for color channels , the overlay has additional alpha plane, like INPUT is yuv420p, and the LOGO is yuva420p.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="pad_005fopencl"></a>
- <h3 class="section">41.10 pad_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#pad_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pad_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Add paddings to the input image, and place the original input at the
- provided <var class="var">x</var>, <var class="var">y</var> coordinates.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Specify an expression for the size of the output image with the
- paddings added. If the value for <var class="var">width</var> or <var class="var">height</var> is 0, the
- corresponding input size is used for the output.
- </p>
- <p>The <var class="var">width</var> expression can reference the value set by the
- <var class="var">height</var> expression, and vice versa.
- </p>
- <p>The default value of <var class="var">width</var> and <var class="var">height</var> is 0.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Specify the offsets to place the input image at within the padded area,
- with respect to the top/left border of the output image.
- </p>
- <p>The <var class="var">x</var> expression can reference the value set by the <var class="var">y</var>
- expression, and vice versa.
- </p>
- <p>The default value of <var class="var">x</var> and <var class="var">y</var> is 0.
- </p>
- <p>If <var class="var">x</var> or <var class="var">y</var> evaluate to a negative number, they’ll be changed
- so the input image is centered on the padded area.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify the color of the padded area. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>.
- </p>
- </dd>
- <dt><samp class="option">aspect</samp></dt>
- <dd><p>Pad to an aspect instead to a resolution.
- </p></dd>
- </dl>
- <p>The value for the <var class="var">width</var>, <var class="var">height</var>, <var class="var">x</var>, and <var class="var">y</var>
- options are expressions containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">in_w</samp></dt>
- <dt><samp class="option">in_h</samp></dt>
- <dd><p>The input video width and height.
- </p>
- </dd>
- <dt><samp class="option">iw</samp></dt>
- <dt><samp class="option">ih</samp></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><samp class="option">out_w</samp></dt>
- <dt><samp class="option">out_h</samp></dt>
- <dd><p>The output width and height (the size of the padded area), as
- specified by the <var class="var">width</var> and <var class="var">height</var> expressions.
- </p>
- </dd>
- <dt><samp class="option">ow</samp></dt>
- <dt><samp class="option">oh</samp></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The x and y offsets as specified by the <var class="var">x</var> and <var class="var">y</var>
- expressions, or NAN if not yet specified.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">iw</var> / <var class="var">ih</var>) * <var class="var">sar</var>
- </p></dd>
- </dl>
- <a name="prewitt_005fopencl"></a>
- <h3 class="section">41.11 prewitt_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#prewitt_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-prewitt_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply the Prewitt operator (<a class="url" href="https://en.wikipedia.org/wiki/Prewitt_operator">https://en.wikipedia.org/wiki/Prewitt_operator</a>) to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">0xf</code>, by which all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- Range is <code class="code">[0.0, 65535]</code> and default value is <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- Range is <code class="code">[-65535, 65535]</code> and default value is <code class="code">0.0</code>.
- </p></dd>
- </dl>
- <a name="Example-15"></a>
- <h4 class="subsection">41.11.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-15" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-15" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply the Prewitt operator with scale set to 2 and delta set to 10.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, prewitt_opencl=scale=2:delta=10, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a class="anchor" id="program_005fopencl"></a><a name="program_005fopencl-1"></a>
- <h3 class="section">41.12 program_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#program_005fopencl-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-program_005fopencl-1" aria-hidden="true">TOC</a></span></h3>
- <p>Filter video using an OpenCL program.
- </p>
- <dl class="table">
- <dt><samp class="option">source</samp></dt>
- <dd><p>OpenCL program source file.
- </p>
- </dd>
- <dt><samp class="option">kernel</samp></dt>
- <dd><p>Kernel name in program.
- </p>
- </dd>
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>Number of inputs to the filter. Defaults to 1.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Size of output frames. Defaults to the same as the first input.
- </p>
- </dd>
- </dl>
- <p>The <code class="code">program_opencl</code> filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p>
- <p>The program source file must contain a kernel function with the given name,
- which will be run once for each plane of the output. Each run on a plane
- gets enqueued as a separate 2D global NDRange with one work-item for each
- pixel to be generated. The global ID offset for each work-item is therefore
- the coordinates of a pixel in the destination image.
- </p>
- <p>The kernel function needs to take the following arguments:
- </p><ul class="itemize mark-bullet">
- <li>Destination image, <var class="var">__write_only image2d_t</var>.
- <p>This image will become the output; the kernel should write all of it.
- </p></li><li>Frame index, <var class="var">unsigned int</var>.
- <p>This is a counter starting from zero and increasing by one for each frame.
- </p></li><li>Source images, <var class="var">__read_only image2d_t</var>.
- <p>These are the most recent images on each input. The kernel may read from
- them to generate the output, but they can’t be written to.
- </p></li></ul>
- <p>Example programs:
- </p>
- <ul class="itemize mark-bullet">
- <li>Copy the input to the output (output must be the same size as the input).
- <pre class="verbatim">__kernel void copy(__write_only image2d_t destination,
- unsigned int index,
- __read_only image2d_t source)
- {
- const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE;
- int2 location = (int2)(get_global_id(0), get_global_id(1));
- float4 value = read_imagef(source, sampler, location);
- write_imagef(destination, location, value);
- }
- </pre>
- </li><li>Apply a simple transformation, rotating the input by an amount increasing
- with the index counter. Pixel values are linearly interpolated by the
- sampler, and the output need not have the same dimensions as the input.
- <pre class="verbatim">__kernel void rotate_image(__write_only image2d_t dst,
- unsigned int index,
- __read_only image2d_t src)
- {
- const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
- CLK_FILTER_LINEAR);
- float angle = (float)index / 100.0f;
- float2 dst_dim = convert_float2(get_image_dim(dst));
- float2 src_dim = convert_float2(get_image_dim(src));
- float2 dst_cen = dst_dim / 2.0f;
- float2 src_cen = src_dim / 2.0f;
- int2 dst_loc = (int2)(get_global_id(0), get_global_id(1));
- float2 dst_pos = convert_float2(dst_loc) - dst_cen;
- float2 src_pos = {
- cos(angle) * dst_pos.x - sin(angle) * dst_pos.y,
- sin(angle) * dst_pos.x + cos(angle) * dst_pos.y
- };
- src_pos = src_pos * src_dim / dst_dim;
- float2 src_loc = src_pos + src_cen;
- if (src_loc.x < 0.0f || src_loc.y < 0.0f ||
- src_loc.x > src_dim.x || src_loc.y > src_dim.y)
- write_imagef(dst, dst_loc, 0.5f);
- else
- write_imagef(dst, dst_loc, read_imagef(src, sampler, src_loc));
- }
- </pre>
- </li><li>Blend two inputs together, with the amount of each input used varying
- with the index counter.
- <pre class="verbatim">__kernel void blend_images(__write_only image2d_t dst,
- unsigned int index,
- __read_only image2d_t src1,
- __read_only image2d_t src2)
- {
- const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
- CLK_FILTER_LINEAR);
- float blend = (cos((float)index / 50.0f) + 1.0f) / 2.0f;
- int2 dst_loc = (int2)(get_global_id(0), get_global_id(1));
- int2 src1_loc = dst_loc * get_image_dim(src1) / get_image_dim(dst);
- int2 src2_loc = dst_loc * get_image_dim(src2) / get_image_dim(dst);
- float4 val1 = read_imagef(src1, sampler, src1_loc);
- float4 val2 = read_imagef(src2, sampler, src2_loc);
- write_imagef(dst, dst_loc, val1 * blend + val2 * (1.0f - blend));
- }
- </pre>
- </li></ul>
- <a name="remap_005fopencl"></a>
- <h3 class="section">41.13 remap_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#remap_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-remap_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Remap pixels using 2nd: Xmap and 3rd: Ymap input video stream.
- </p>
- <p>Destination pixel at position (X, Y) will be picked from source (x, y) position
- where x = Xmap(X, Y) and y = Ymap(X, Y). If mapping values are out of range, zero
- value for pixel will be used for destination pixel.
- </p>
- <p>Xmap and Ymap input video streams must be of same dimensions. Output video stream
- will have Xmap/Ymap video stream dimensions.
- Xmap and Ymap input video streams are 32bit float pixel format, single channel.
- </p>
- <dl class="table">
- <dt><samp class="option">interp</samp></dt>
- <dd><p>Specify interpolation used for remapping of pixels.
- Allowed values are <code class="code">near</code> and <code class="code">linear</code>.
- Default value is <code class="code">linear</code>.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>Specify the color of the unmapped pixels. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>. Default color is <code class="code">black</code>.
- </p></dd>
- </dl>
- <a name="roberts_005fopencl"></a>
- <h3 class="section">41.14 roberts_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#roberts_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-roberts_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply the Roberts cross operator (<a class="url" href="https://en.wikipedia.org/wiki/Roberts_cross">https://en.wikipedia.org/wiki/Roberts_cross</a>) to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">0xf</code>, by which all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- Range is <code class="code">[0.0, 65535]</code> and default value is <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- Range is <code class="code">[-65535, 65535]</code> and default value is <code class="code">0.0</code>.
- </p></dd>
- </dl>
- <a name="Example-16"></a>
- <h4 class="subsection">41.14.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-16" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-16" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply the Roberts cross operator with scale set to 2 and delta set to 10
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, roberts_opencl=scale=2:delta=10, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="sobel_005fopencl"></a>
- <h3 class="section">41.15 sobel_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#sobel_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sobel_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Apply the Sobel operator (<a class="url" href="https://en.wikipedia.org/wiki/Sobel_operator">https://en.wikipedia.org/wiki/Sobel_operator</a>) to input video stream.
- </p>
- <p>The filter accepts the following option:
- </p>
- <dl class="table">
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">0xf</code>, by which all planes are processed.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set value which will be multiplied with filtered result.
- Range is <code class="code">[0.0, 65535]</code> and default value is <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">delta</samp></dt>
- <dd><p>Set value which will be added to filtered result.
- Range is <code class="code">[-65535, 65535]</code> and default value is <code class="code">0.0</code>.
- </p></dd>
- </dl>
- <a name="Example-17"></a>
- <h4 class="subsection">41.15.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-17" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-17" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply sobel operator with scale set to 2 and delta set to 10
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, sobel_opencl=scale=2:delta=10, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="tonemap_005fopencl"></a>
- <h3 class="section">41.16 tonemap_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#tonemap_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tonemap_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Perform HDR(PQ/HLG) to SDR conversion with tone-mapping.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">tonemap</samp></dt>
- <dd><p>Specify the tone-mapping operator to be used. Same as tonemap option in <a class="ref" href="#tonemap">tonemap</a>.
- </p>
- </dd>
- <dt><samp class="option">param</samp></dt>
- <dd><p>Tune the tone mapping algorithm. same as param option in <a class="ref" href="#tonemap">tonemap</a>.
- </p>
- </dd>
- <dt><samp class="option">desat</samp></dt>
- <dd><p>Apply desaturation for highlights that exceed this level of brightness. The
- higher the parameter, the more color information will be preserved. This
- setting helps prevent unnaturally blown-out colors for super-highlights, by
- (smoothly) turning into white instead. This makes images feel more natural,
- at the cost of reducing information about out-of-range colors.
- </p>
- <p>The default value is 0.5, and the algorithm here is a little different from
- the cpu version tonemap currently. A setting of 0.0 disables this option.
- </p>
- </dd>
- <dt><samp class="option">threshold</samp></dt>
- <dd><p>The tonemapping algorithm parameters is fine-tuned per each scene. And a threshold
- is used to detect whether the scene has changed or not. If the distance between
- the current frame average brightness and the current running average exceeds
- a threshold value, we would re-calculate scene average and peak brightness.
- The default value is 0.2.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Specify the output pixel format.
- </p>
- <p>Currently supported formats are:
- </p><dl class="table">
- <dt><var class="var">p010</var></dt>
- <dt><var class="var">nv12</var></dt>
- </dl>
- </dd>
- <dt><samp class="option">range, r</samp></dt>
- <dd><p>Set the output color range.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">tv/mpeg</var></dt>
- <dt><var class="var">pc/jpeg</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">primaries, p</samp></dt>
- <dd><p>Set the output color primaries.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">bt709</var></dt>
- <dt><var class="var">bt2020</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- <dt><samp class="option">transfer, t</samp></dt>
- <dd><p>Set the output transfer characteristics.
- </p>
- <p>Possible values are:
- </p><dl class="table">
- <dt><var class="var">bt709</var></dt>
- <dt><var class="var">bt2020</var></dt>
- </dl>
- <p>Default is bt709.
- </p>
- </dd>
- <dt><samp class="option">matrix, m</samp></dt>
- <dd><p>Set the output colorspace matrix.
- </p>
- <p>Possible value are:
- </p><dl class="table">
- <dt><var class="var">bt709</var></dt>
- <dt><var class="var">bt2020</var></dt>
- </dl>
- <p>Default is same as input.
- </p>
- </dd>
- </dl>
- <a name="Example-18"></a>
- <h4 class="subsection">41.16.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-18" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-18" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert HDR(PQ/HLG) video to bt2020-transfer-characteristic p010 format using linear operator.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "format=p010,hwupload,tonemap_opencl=t=bt2020:tonemap=linear:format=p010,hwdownload,format=p010" OUTPUT
- </pre></div>
- </li></ul>
- <a name="unsharp_005fopencl"></a>
- <h3 class="section">41.17 unsharp_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#unsharp_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-unsharp_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Sharpen or blur the input video.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">luma_msize_x, lx</samp></dt>
- <dd><p>Set the luma matrix horizontal size.
- Range is <code class="code">[1, 23]</code> and default value is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">luma_msize_y, ly</samp></dt>
- <dd><p>Set the luma matrix vertical size.
- Range is <code class="code">[1, 23]</code> and default value is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">luma_amount, la</samp></dt>
- <dd><p>Set the luma effect strength.
- Range is <code class="code">[-10, 10]</code> and default value is <code class="code">1.0</code>.
- </p>
- <p>Negative values will blur the input video, while positive values will
- sharpen it, a value of zero will disable the effect.
- </p>
- </dd>
- <dt><samp class="option">chroma_msize_x, cx</samp></dt>
- <dd><p>Set the chroma matrix horizontal size.
- Range is <code class="code">[1, 23]</code> and default value is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">chroma_msize_y, cy</samp></dt>
- <dd><p>Set the chroma matrix vertical size.
- Range is <code class="code">[1, 23]</code> and default value is <code class="code">5</code>.
- </p>
- </dd>
- <dt><samp class="option">chroma_amount, ca</samp></dt>
- <dd><p>Set the chroma effect strength.
- Range is <code class="code">[-10, 10]</code> and default value is <code class="code">0.0</code>.
- </p>
- <p>Negative values will blur the input video, while positive values will
- sharpen it, a value of zero will disable the effect.
- </p>
- </dd>
- </dl>
- <p>All parameters are optional and default to the equivalent of the
- string ’5:5:1.0:5:5:0.0’.
- </p>
- <a name="Examples-197"></a>
- <h4 class="subsection">41.17.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-197" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-197" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Apply strong luma sharpen effect:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, unsharp_opencl=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5, hwdownload" OUTPUT
- </pre></div>
- </li><li>Apply a strong blur of both luma and chroma parameters:
- <div class="example">
- <pre class="example-preformatted">-i INPUT -vf "hwupload, unsharp_opencl=7:7:-2:7:7:-2, hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <a name="xfade_005fopencl"></a>
- <h3 class="section">41.18 xfade_opencl<span class="pull-right"><a class="anchor hidden-xs" href="#xfade_005fopencl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xfade_005fopencl" aria-hidden="true">TOC</a></span></h3>
- <p>Cross fade two videos with custom transition effect by using OpenCL.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">transition</samp></dt>
- <dd><p>Set one of possible transition effects.
- </p>
- <dl class="table">
- <dt><samp class="option">custom</samp></dt>
- <dd><p>Select custom transition effect, the actual transition description
- will be picked from source and kernel options.
- </p>
- </dd>
- <dt><samp class="option">fade</samp></dt>
- <dt><samp class="option">wipeleft</samp></dt>
- <dt><samp class="option">wiperight</samp></dt>
- <dt><samp class="option">wipeup</samp></dt>
- <dt><samp class="option">wipedown</samp></dt>
- <dt><samp class="option">slideleft</samp></dt>
- <dt><samp class="option">slideright</samp></dt>
- <dt><samp class="option">slideup</samp></dt>
- <dt><samp class="option">slidedown</samp></dt>
- <dd>
- <p>Default transition is fade.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">source</samp></dt>
- <dd><p>OpenCL program source file for custom transition.
- </p>
- </dd>
- <dt><samp class="option">kernel</samp></dt>
- <dd><p>Set name of kernel to use for custom transition from program source file.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>Set duration of video transition.
- </p>
- </dd>
- <dt><samp class="option">offset</samp></dt>
- <dd><p>Set time of start of transition relative to first video.
- </p></dd>
- </dl>
- <p>The program source file must contain a kernel function with the given name,
- which will be run once for each plane of the output. Each run on a plane
- gets enqueued as a separate 2D global NDRange with one work-item for each
- pixel to be generated. The global ID offset for each work-item is therefore
- the coordinates of a pixel in the destination image.
- </p>
- <p>The kernel function needs to take the following arguments:
- </p><ul class="itemize mark-bullet">
- <li>Destination image, <var class="var">__write_only image2d_t</var>.
- <p>This image will become the output; the kernel should write all of it.
- </p>
- </li><li>First Source image, <var class="var">__read_only image2d_t</var>.
- Second Source image, <var class="var">__read_only image2d_t</var>.
- <p>These are the most recent images on each input. The kernel may read from
- them to generate the output, but they can’t be written to.
- </p>
- </li><li>Transition progress, <var class="var">float</var>. This value is always between 0 and 1 inclusive.
- </li></ul>
- <p>Example programs:
- </p>
- <ul class="itemize mark-bullet">
- <li>Apply dots curtain transition effect:
- <pre class="verbatim">__kernel void blend_images(__write_only image2d_t dst,
- __read_only image2d_t src1,
- __read_only image2d_t src2,
- float progress)
- {
- const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
- CLK_FILTER_LINEAR);
- int2 p = (int2)(get_global_id(0), get_global_id(1));
- float2 rp = (float2)(get_global_id(0), get_global_id(1));
- float2 dim = (float2)(get_image_dim(src1).x, get_image_dim(src1).y);
- rp = rp / dim;
- float2 dots = (float2)(20.0, 20.0);
- float2 center = (float2)(0,0);
- float2 unused;
- float4 val1 = read_imagef(src1, sampler, p);
- float4 val2 = read_imagef(src2, sampler, p);
- bool next = distance(fract(rp * dots, &unused), (float2)(0.5, 0.5)) < (progress / distance(rp, center));
- write_imagef(dst, p, next ? val1 : val2);
- }
- </pre>
- </li></ul>
- <a name="VAAPI-Video-Filters"></a>
- <h2 class="chapter">42 VAAPI Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#VAAPI-Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-VAAPI-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>VAAPI Video filters are usually used with VAAPI decoder and VAAPI encoder. Below is a description of VAAPI video filters.
- </p>
- <p>To enable compilation of these filters you need to configure FFmpeg with
- <code class="code">--enable-vaapi</code>.
- </p>
- <p>To use vaapi filters, you need to setup the vaapi device correctly. For more information, please read <a class="url" href="https://trac.ffmpeg.org/wiki/Hardware/VAAPI">https://trac.ffmpeg.org/wiki/Hardware/VAAPI</a>
- </p>
- <a name="overlay_005fvaapi"></a>
- <h3 class="section">42.1 overlay_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#overlay_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-overlay_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Overlay one video on the top of another.
- </p>
- <p>It takes two inputs and has one output. The first input is the "main" video on which the second input is overlaid.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set expressions for the x and y coordinates of the overlaid video
- on the main video.
- </p>
- <p>Default value is "0" for both expressions.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set expressions for the width and height the overlaid video
- on the main video.
- </p>
- <p>Default values are ’overlay_iw’ for ’w’ and ’overlay_ih*w/overlay_iw’ for ’h’.
- </p>
- <p>The expressions can contain the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">main_w, W</samp></dt>
- <dt><samp class="option">main_h, H</samp></dt>
- <dd><p>The main input width and height.
- </p>
- </dd>
- <dt><samp class="option">overlay_iw</samp></dt>
- <dt><samp class="option">overlay_ih</samp></dt>
- <dd><p>The overlay input width and height.
- </p>
- </dd>
- <dt><samp class="option">overlay_w, w</samp></dt>
- <dt><samp class="option">overlay_h, h</samp></dt>
- <dd><p>The overlay output width and height.
- </p>
- </dd>
- <dt><samp class="option">overlay_x, x</samp></dt>
- <dt><samp class="option">overlay_y, y</samp></dt>
- <dd><p>Position of the overlay layer inside of main
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>Set transparency of overlaid video. Allowed range is 0.0 to 1.0.
- Higher value means lower transparency.
- Default value is <code class="code">1.0</code>.
- </p>
- </dd>
- <dt><samp class="option">eof_action</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- <dt><samp class="option">repeatlast</samp></dt>
- <dd><p>See <a class="ref" href="#framesync">framesync</a>.
- </p>
- </dd>
- </dl>
- <p>This filter also supports the <a class="ref" href="#framesync">framesync</a> options.
- </p><a name="Examples-198"></a>
- <h4 class="subsection">42.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-198" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-198" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Overlay an image LOGO at the top-left corner of the INPUT video. Both inputs for this filter are yuv420p format.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuv420p, hwupload[b], [a][b]overlay_vaapi" OUTPUT
- </pre></div>
- </li><li>Overlay an image LOGO at the offset (200, 100) from the top-left corner of the INPUT video.
- The inputs have same memory layout for color channels, the overlay has additional alpha plane, like INPUT is yuv420p, and the LOGO is yuva420p.
- <div class="example">
- <pre class="example-preformatted">-i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_vaapi=x=200:y=100:w=400:h=300:alpha=1.0, hwdownload, format=nv12" OUTPUT
- </pre></div>
- </li></ul>
- <a name="tonemap_005fvaapi"></a>
- <h3 class="section">42.2 tonemap_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#tonemap_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-tonemap_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Perform HDR-to-SDR or HDR-to-HDR tone-mapping.
- It currently only accepts HDR10 as input.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">format</samp></dt>
- <dd><p>Specify the output pixel format.
- </p>
- <p>Default is nv12 for HDR-to-SDR tone-mapping and p010 for HDR-to-HDR
- tone-mapping.
- </p>
- </dd>
- <dt><samp class="option">primaries, p</samp></dt>
- <dd><p>Set the output color primaries.
- </p>
- <p>Default is bt709 for HDR-to-SDR tone-mapping and same as input for HDR-to-HDR
- tone-mapping.
- </p>
- </dd>
- <dt><samp class="option">transfer, t</samp></dt>
- <dd><p>Set the output transfer characteristics.
- </p>
- <p>Default is bt709 for HDR-to-SDR tone-mapping and same as input for HDR-to-HDR
- tone-mapping.
- </p>
- </dd>
- <dt><samp class="option">matrix, m</samp></dt>
- <dd><p>Set the output colorspace matrix.
- </p>
- <p>Default is bt709 for HDR-to-SDR tone-mapping and same as input for HDR-to-HDR
- tone-mapping.
- </p>
- </dd>
- <dt><samp class="option">display</samp></dt>
- <dd><p>Set the output mastering display colour volume. It is given by a ’|’-separated
- list of two values, two values are space separated. It set display primaries
- x & y in G, B, R order, then white point x & y, the nominal minimum & maximum
- display luminances.
- </p>
- <p>HDR-to-HDR tone-mapping will be performed when this option is set.
- </p>
- </dd>
- <dt><samp class="option">light</samp></dt>
- <dd><p>Set the output content light level information. It accepts 2 space-separated
- values, the first input is the maximum light level and the second input is
- the maximum average light level.
- </p>
- <p>It is ignored for HDR-to-SDR tone-mapping, and optional for HDR-to-HDR
- tone-mapping.
- </p>
- </dd>
- </dl>
- <a name="Example-19"></a>
- <h4 class="subsection">42.2.1 Example<span class="pull-right"><a class="anchor hidden-xs" href="#Example-19" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Example-19" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Convert HDR(HDR10) video to bt2020-transfer-characteristic p010 format
- <div class="example">
- <pre class="example-preformatted">tonemap_vaapi=format=p010:t=bt2020-10
- </pre></div>
- </li><li>Convert HDR video to HDR video
- <div class="example">
- <pre class="example-preformatted">tonemap_vaapi=display=7500\ 3000|34000\ 16000|13250\ 34500|15635\ 16450|500\ 10000000
- </pre></div>
- </li></ul>
- <a name="hstack_005fvaapi"></a>
- <h3 class="section">42.3 hstack_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#hstack_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hstack_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Stack input videos horizontally.
- </p>
- <p>This is the VA-API variant of the <a class="ref" href="#hstack">hstack</a> filter, each input stream may
- have different height, this filter will scale down/up each input stream while
- keeping the original aspect.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>See <a class="ref" href="#hstack">hstack</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#hstack">hstack</a>.
- </p>
- </dd>
- <dt><samp class="option">height</samp></dt>
- <dd><p>Set height of output. If set to 0, this filter will set height of output to
- height of the first input stream. Default value is 0.
- </p></dd>
- </dl>
- <a name="vstack_005fvaapi"></a>
- <h3 class="section">42.4 vstack_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#vstack_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vstack_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Stack input videos vertically.
- </p>
- <p>This is the VA-API variant of the <a class="ref" href="#vstack">vstack</a> filter, each input stream may
- have different width, this filter will scale down/up each input stream while
- keeping the original aspect.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>See <a class="ref" href="#vstack">vstack</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#vstack">vstack</a>.
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>Set width of output. If set to 0, this filter will set width of output to
- width of the first input stream. Default value is 0.
- </p></dd>
- </dl>
- <a name="xstack_005fvaapi"></a>
- <h3 class="section">42.5 xstack_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#xstack_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xstack_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Stack video inputs into custom layout.
- </p>
- <p>This is the VA-API variant of the <a class="ref" href="#xstack">xstack</a> filter, each input stream may
- have different size, this filter will scale down/up each input stream to the
- given output size, or the size of the first input stream.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p>
- </dd>
- <dt><samp class="option">layout</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- Moreover, this permits the user to supply output size for each input stream.
- </p><div class="example">
- <pre class="example-preformatted">xstack_vaapi=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
- </pre></div>
- </dd>
- <dt><samp class="option">grid</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p>
- </dd>
- <dt><samp class="option">grid_tile_size</samp></dt>
- <dd><p>Set output size for each input stream when <samp class="option">grid</samp> is set. If this option
- is not set, this filter will set output size by default to the size of the
- first input stream. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p></dd>
- </dl>
- <a name="pad_005fvaapi"></a>
- <h3 class="section">42.6 pad_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#pad_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pad_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Add paddings to the input image, and place the original input at the
- provided <var class="var">x</var>, <var class="var">y</var> coordinates.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>Specify an expression for the size of the output image with the
- paddings added. If the value for <var class="var">width</var> or <var class="var">height</var> is 0, the
- corresponding input size is used for the output.
- </p>
- <p>The <var class="var">width</var> expression can reference the value set by the
- <var class="var">height</var> expression, and vice versa.
- </p>
- <p>The default value of <var class="var">width</var> and <var class="var">height</var> is 0.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Specify the offsets to place the input image at within the padded area,
- with respect to the top/left border of the output image.
- </p>
- <p>The <var class="var">x</var> expression can reference the value set by the <var class="var">y</var>
- expression, and vice versa.
- </p>
- <p>The default value of <var class="var">x</var> and <var class="var">y</var> is 0.
- </p>
- <p>If <var class="var">x</var> or <var class="var">y</var> evaluate to a negative number, they’ll be changed
- so the input image is centered on the padded area.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify the color of the padded area. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils
- manual</a>.
- </p>
- </dd>
- <dt><samp class="option">aspect</samp></dt>
- <dd><p>Pad to an aspect instead to a resolution.
- </p></dd>
- </dl>
- <p>The value for the <var class="var">width</var>, <var class="var">height</var>, <var class="var">x</var>, and <var class="var">y</var>
- options are expressions containing the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">in_w</samp></dt>
- <dt><samp class="option">in_h</samp></dt>
- <dd><p>The input video width and height.
- </p>
- </dd>
- <dt><samp class="option">iw</samp></dt>
- <dt><samp class="option">ih</samp></dt>
- <dd><p>These are the same as <var class="var">in_w</var> and <var class="var">in_h</var>.
- </p>
- </dd>
- <dt><samp class="option">out_w</samp></dt>
- <dt><samp class="option">out_h</samp></dt>
- <dd><p>The output width and height (the size of the padded area), as
- specified by the <var class="var">width</var> and <var class="var">height</var> expressions.
- </p>
- </dd>
- <dt><samp class="option">ow</samp></dt>
- <dt><samp class="option">oh</samp></dt>
- <dd><p>These are the same as <var class="var">out_w</var> and <var class="var">out_h</var>.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The x and y offsets as specified by the <var class="var">x</var> and <var class="var">y</var>
- expressions, or NAN if not yet specified.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>same as <var class="var">iw</var> / <var class="var">ih</var>
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>input sample aspect ratio
- </p>
- </dd>
- <dt><samp class="option">dar</samp></dt>
- <dd><p>input display aspect ratio, it is the same as (<var class="var">iw</var> / <var class="var">ih</var>) * <var class="var">sar</var>
- </p></dd>
- </dl>
- <a name="drawbox_005fvaapi"></a>
- <h3 class="section">42.7 drawbox_vaapi<span class="pull-right"><a class="anchor hidden-xs" href="#drawbox_005fvaapi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-drawbox_005fvaapi" aria-hidden="true">TOC</a></span></h3>
- <p>Draw a colored box on the input image.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The expressions which specify the top left corner coordinates of the box. It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">width, w</samp></dt>
- <dt><samp class="option">height, h</samp></dt>
- <dd><p>The expressions which specify the width and height of the box; if 0 they are interpreted as
- the input width and height. It defaults to 0.
- </p>
- </dd>
- <dt><samp class="option">color, c</samp></dt>
- <dd><p>Specify the color of the box to write. For the general syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">thickness, t</samp></dt>
- <dd><p>The expression which sets the thickness of the box edge.
- A value of <code class="code">fill</code> will create a filled box. Default value is <code class="code">3</code>.
- </p>
- <p>See below for the list of accepted constants.
- </p>
- </dd>
- <dt><samp class="option">replace</samp></dt>
- <dd><p>With value <code class="code">1</code>, the pixels of the painted box will overwrite the video’s color and alpha pixels.
- Default is <code class="code">0</code>, which composites the box onto the input video.
- </p></dd>
- </dl>
- <p>The parameters for <var class="var">x</var>, <var class="var">y</var>, <var class="var">w</var> and <var class="var">h</var> and <var class="var">t</var> are expressions containing the
- following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">in_h, ih</samp></dt>
- <dt><samp class="option">in_w, iw</samp></dt>
- <dd><p>The input width and height.
- </p>
- </dd>
- <dt><samp class="option">x</samp></dt>
- <dt><samp class="option">y</samp></dt>
- <dd><p>The x and y offset coordinates where the box is drawn.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>The width and height of the drawn box.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The thickness of the drawn box.
- </p>
- </dd>
- </dl>
- <a name="Examples-199"></a>
- <h4 class="subsection">42.7.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-199" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-199" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Draw a black box around the edge of the input image:
- <div class="example">
- <pre class="example-preformatted">drawbox
- </pre></div>
- </li><li>Draw a box with color red and an opacity of 50%:
- <div class="example">
- <pre class="example-preformatted">drawbox=10:20:200:60:red@0.5
- </pre></div>
- <p>The previous example can be specified as:
- </p><div class="example">
- <pre class="example-preformatted">drawbox=x=10:y=20:w=200:h=60:color=red@0.5
- </pre></div>
- </li><li>Fill the box with pink color:
- <div class="example">
- <pre class="example-preformatted">drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=fill
- </pre></div>
- </li><li>Draw a 2-pixel red 2.40:1 mask:
- <div class="example">
- <pre class="example-preformatted">drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red
- </pre></div>
- </li></ul>
- <a name="VideoToolbox-Video-Filters"></a>
- <h2 class="chapter">43 VideoToolbox Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#VideoToolbox-Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-VideoToolbox-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available VideoToolbox video filters.
- </p>
- <p>VideoToolbox filter depends on VideoToolbox framework, and is auto detected
- when building ffmpeg for an Apple platform such as macOS. Add
- <code class="code">--enable-videotoolbox</code> to configure if autodetect is disabled.
- </p>
- <a name="scale_005fvt"></a>
- <h3 class="section">43.1 scale_vt<span class="pull-right"><a class="anchor hidden-xs" href="#scale_005fvt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-scale_005fvt" aria-hidden="true">TOC</a></span></h3>
- <p>Scale and convert the color parameters using VTPixelTransferSession.
- </p>
- <p>The filter accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">w</samp></dt>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set the output video dimension expression. Default value is the input dimension.
- </p>
- </dd>
- <dt><samp class="option">color_matrix</samp></dt>
- <dd><p>Set the output colorspace matrix.
- </p>
- </dd>
- <dt><samp class="option">color_primaries</samp></dt>
- <dd><p>Set the output color primaries.
- </p>
- </dd>
- <dt><samp class="option">color_transfer</samp></dt>
- <dd><p>Set the output transfer characteristics.
- </p>
- </dd>
- </dl>
- <a name="Examples-200"></a>
- <h4 class="subsection">43.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-200" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-200" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Perform HDR to SDR conversion, and scale to half size of input
- <div class="example">
- <pre class="example-preformatted">ffmpeg -hwaccel videotoolbox \
- -hwaccel_output_format videotoolbox_vld \
- -i hdr.mov \
- -c:v hevc_videotoolbox \
- -profile:v main \
- -b:v 3M \
- -vf scale_vt=w=iw/2:h=ih/2:color_matrix=bt709:color_primaries=bt709:color_transfer=bt709 \
- -c:a copy \
- -tag:v hvc1 \
- sdr.mp4
- </pre></div>
- </li></ul>
- <a name="transpose_005fvt"></a>
- <h3 class="section">43.2 transpose_vt<span class="pull-right"><a class="anchor hidden-xs" href="#transpose_005fvt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-transpose_005fvt" aria-hidden="true">TOC</a></span></h3>
- <p>Transpose rows with columns in the input video and optionally flip it.
- For more in depth examples see the <a class="ref" href="#transpose">transpose</a> video filter, which shares mostly the same options.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">dir</samp></dt>
- <dd><p>Specify the transposition direction.
- </p>
- <p>Can assume the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">cclock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise and vertically flip. (default)
- </p>
- </dd>
- <dt>‘<samp class="samp">clock</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">cclock</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">clock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise and vertically flip.
- </p>
- </dd>
- <dt>‘<samp class="samp">hflip</samp>’</dt>
- <dd><p>Flip the input video horizontally.
- </p>
- </dd>
- <dt>‘<samp class="samp">vflip</samp>’</dt>
- <dd><p>Flip the input video vertically.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">passthrough</samp></dt>
- <dd><p>Do not apply the transposition if the input geometry matches the one
- specified by the specified value. It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Always apply transposition. (default)
- </p></dd>
- <dt>‘<samp class="samp">portrait</samp>’</dt>
- <dd><p>Preserve portrait geometry (when <var class="var">height</var> >= <var class="var">width</var>).
- </p></dd>
- <dt>‘<samp class="samp">landscape</samp>’</dt>
- <dd><p>Preserve landscape geometry (when <var class="var">width</var> >= <var class="var">height</var>).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Vulkan-Video-Filters"></a>
- <h2 class="chapter">44 Vulkan Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#Vulkan-Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Vulkan-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available Vulkan video filters.
- </p>
- <p>To enable compilation of these filters you need to configure FFmpeg with
- <code class="code">--enable-vulkan</code> and either <code class="code">--enable-libglslang</code> or <code class="code">--enable-libshaderc</code>.
- </p>
- <p>Running Vulkan filters requires you to initialize a hardware device and to pass that device to all filters in any filter graph.
- </p><dl class="table">
- <dt><samp class="option">-init_hw_device vulkan[=<var class="var">name</var>][:<var class="var">device</var>[,<var class="var">key=value</var>...]]</samp></dt>
- <dd><p>Initialise a new hardware device of type <var class="var">vulkan</var> called <var class="var">name</var>, using the
- given device parameters and options in <var class="var">key=value</var>. The following options
- are supported:
- </p>
- <dl class="table">
- <dt><samp class="option">debug</samp></dt>
- <dd><p>Switches validation layers on if set to 1.
- </p>
- </dd>
- <dt><samp class="option">linear_images</samp></dt>
- <dd><p>Allocates linear images. Does not apply to decoding.
- </p>
- </dd>
- <dt><samp class="option">disable_multiplane</samp></dt>
- <dd><p>Disables multiplane images. Does not apply to decoding.
- </p>
- </dd>
- <dt><samp class="option">avoid_host_import</samp></dt>
- <dd><p>Avoids the use of dynamic host memory imports, in favor of a regular memcpy()
- into a previously mapped buffer.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">-filter_hw_device <var class="var">name</var></samp></dt>
- <dd><p>Pass the hardware device called <var class="var">name</var> to all filters in any filter graph.
- </p>
- </dd>
- </dl>
- <p>For more detailed information see <a class="url" href="https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options">https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options</a>
- </p>
- <ul class="itemize mark-bullet">
- <li>Example of choosing the first device and running nlmeans_vulkan filter with default parameters on it.
- <div class="example">
- <pre class="example-preformatted">-init_hw_device vulkan=vk:0 -filter_hw_device vk -i INPUT -vf "hwupload,nlmeans_vulkan,hwdownload" OUTPUT
- </pre></div>
- </li></ul>
- <p>As Vulkan filters are not able to access frame data in normal memory, all frame data needs to be uploaded (<a class="ref" href="#hwupload">hwupload</a>) to hardware surfaces connected to the appropriate device before being used and then downloaded (<a class="ref" href="#hwdownload">hwdownload</a>) back to normal memory. Note that <a class="ref" href="#hwupload">hwupload</a> will upload to a frame with the same layout as the software frame, so it may be necessary to add a <a class="ref" href="#format">format</a> filter immediately before to get the input into the right format and <a class="ref" href="#hwdownload">hwdownload</a> does not support all formats on the output - it is usually necessary to insert an additional <a class="ref" href="#format">format</a> filter immediately following in the graph to get the output in a supported format.
- </p>
- <a name="avgblur_005fvulkan"></a>
- <h3 class="section">44.1 avgblur_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#avgblur_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avgblur_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Apply an average blur filter, implemented on the GPU using Vulkan.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sizeX</samp></dt>
- <dd><p>Set horizontal radius size.
- Range is <code class="code">[1, 32]</code> and default value is <code class="code">3</code>.
- </p>
- </dd>
- <dt><samp class="option">sizeY</samp></dt>
- <dd><p>Set vertical radius size. Range is <code class="code">[1, 32]</code> and default value is <code class="code">3</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. Default value is <code class="code">0xf</code>, by which all planes are processed.
- </p></dd>
- </dl>
- <a name="blend_005fvulkan"></a>
- <h3 class="section">44.2 blend_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#blend_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-blend_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Blend two Vulkan frames into each other.
- </p>
- <p>The <code class="code">blend</code> filter takes two input streams and outputs one
- stream, the first input is the "top" layer and second input is
- "bottom" layer. By default, the output terminates when the longest input terminates.
- </p>
- <p>A description of the accepted options follows.
- </p>
- <dl class="table">
- <dt><samp class="option">c0_mode</samp></dt>
- <dt><samp class="option">c1_mode</samp></dt>
- <dt><samp class="option">c2_mode</samp></dt>
- <dt><samp class="option">c3_mode</samp></dt>
- <dt><samp class="option">all_mode</samp></dt>
- <dd><p>Set blend mode for specific pixel component or all pixel components in case
- of <var class="var">all_mode</var>. Default value is <code class="code">normal</code>.
- </p>
- <p>Available values for component modes are:
- </p><dl class="table">
- <dt>‘<samp class="samp">normal</samp>’</dt>
- <dt>‘<samp class="samp">multiply</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="bwdif_005fvulkan"></a>
- <h3 class="section">44.3 bwdif_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#bwdif_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bwdif_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Deinterlacer using <a class="ref" href="#bwdif">bwdif</a>, the "Bob Weaver Deinterlacing Filter" algorithm, implemented
- on the GPU using Vulkan.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>The interlacing mode to adopt. It accepts one of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, send_frame</samp></dt>
- <dd><p>Output one frame for each frame.
- </p></dd>
- <dt><samp class="option">1, send_field</samp></dt>
- <dd><p>Output one frame for each field.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">send_field</code>.
- </p>
- </dd>
- <dt><samp class="option">parity</samp></dt>
- <dd><p>The picture field parity assumed for the input interlaced video. It accepts one
- of the following values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, tff</samp></dt>
- <dd><p>Assume the top field is first.
- </p></dd>
- <dt><samp class="option">1, bff</samp></dt>
- <dd><p>Assume the bottom field is first.
- </p></dd>
- <dt><samp class="option">-1, auto</samp></dt>
- <dd><p>Enable automatic detection of field parity.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">auto</code>.
- If the interlacing is unknown or the decoder does not export this information,
- top field first will be assumed.
- </p>
- </dd>
- <dt><samp class="option">deint</samp></dt>
- <dd><p>Specify which frames to deinterlace. Accepts one of the following
- values:
- </p>
- <dl class="table">
- <dt><samp class="option">0, all</samp></dt>
- <dd><p>Deinterlace all frames.
- </p></dd>
- <dt><samp class="option">1, interlaced</samp></dt>
- <dd><p>Only deinterlace frames marked as interlaced.
- </p></dd>
- </dl>
- <p>The default value is <code class="code">all</code>.
- </p></dd>
- </dl>
- <a name="chromaber_005fvulkan"></a>
- <h3 class="section">44.4 chromaber_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#chromaber_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-chromaber_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Apply an effect that emulates chromatic aberration. Works best with RGB inputs,
- but provides a similar effect with YCbCr inputs too.
- </p>
- <dl class="table">
- <dt><samp class="option">dist_x</samp></dt>
- <dd><p>Horizontal displacement multiplier. Each chroma pixel’s position will be multiplied
- by this amount, starting from the center of the image. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">dist_y</samp></dt>
- <dd><p>Similarly, this sets the vertical displacement multiplier. Default is <code class="code">0</code>.
- </p>
- </dd>
- </dl>
- <a name="color_005fvulkan"></a>
- <h3 class="section">44.5 color_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#color_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-color_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Video source that creates a Vulkan frame of a solid color.
- Useful for benchmarking, or overlaying.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">color</samp></dt>
- <dd><p>The color to use. Either a name, or a hexadecimal value.
- The default value is <code class="code">black</code>.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>The size of the output frame. Default value is <code class="code">1920x1080</code>.
- </p>
- </dd>
- <dt><samp class="option">rate</samp></dt>
- <dd><p>The framerate to output at. Default value is <code class="code">60</code> frames per second.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>The video duration. Default value is <code class="code">-0.000001</code>.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>The video signal aspect ratio. Default value is <code class="code">1/1</code>.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>The pixel format of the output Vulkan frames. Default value is <code class="code">yuv444p</code>.
- </p>
- </dd>
- <dt><samp class="option">out_range</samp></dt>
- <dd><p>Set the output YCbCr sample range.
- </p>
- <p>This allows the autodetected value to be overridden as well as allows forcing
- a specific value used for the output and encoder. If not specified, the
- range depends on the pixel format. Possible values:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto/unknown</samp>’</dt>
- <dd><p>Choose automatically.
- </p>
- </dd>
- <dt>‘<samp class="samp">jpeg/full/pc</samp>’</dt>
- <dd><p>Set full range (0-255 in case of 8-bit luma).
- </p>
- </dd>
- <dt>‘<samp class="samp">mpeg/limited/tv</samp>’</dt>
- <dd><p>Set "MPEG" range (16-235 in case of 8-bit luma).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="vflip_005fvulkan"></a>
- <h3 class="section">44.6 vflip_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#vflip_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vflip_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Flips an image vertically.
- </p>
- <a name="hflip_005fvulkan"></a>
- <h3 class="section">44.7 hflip_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#hflip_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hflip_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Flips an image horizontally.
- </p>
- <a name="flip_005fvulkan"></a>
- <h3 class="section">44.8 flip_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#flip_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-flip_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Flips an image along both the vertical and horizontal axis.
- </p>
- <a name="gblur_005fvulkan"></a>
- <h3 class="section">44.9 gblur_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#gblur_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gblur_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Apply Gaussian blur filter on Vulkan frames.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sigma</samp></dt>
- <dd><p>Set horizontal sigma, standard deviation of Gaussian blur. Default is <code class="code">0.5</code>.
- </p>
- </dd>
- <dt><samp class="option">sigmaV</samp></dt>
- <dd><p>Set vertical sigma, if negative it will be same as <code class="code">sigma</code>.
- Default is <code class="code">-1</code>.
- </p>
- </dd>
- <dt><samp class="option">planes</samp></dt>
- <dd><p>Set which planes to filter. By default all planes are filtered.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set the kernel size along the horizontal axis. Default is <code class="code">19</code>.
- </p>
- </dd>
- <dt><samp class="option">sizeV</samp></dt>
- <dd><p>Set the kernel size along the vertical axis. Default is <code class="code">0</code>,
- which sets to use the same value as <var class="var">size</var>.
- </p>
- </dd>
- </dl>
- <a name="nlmeans_005fvulkan"></a>
- <h3 class="section">44.10 nlmeans_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#nlmeans_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-nlmeans_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Denoise frames using Non-Local Means algorithm, implemented on the GPU using
- Vulkan.
- Supports more pixel formats than <a class="ref" href="#nlmeans">nlmeans</a> or <a class="ref" href="#nlmeans_005fopencl">nlmeans_opencl</a>, including
- alpha channel support.
- </p>
- <p>The filter accepts the following options.
- </p>
- <dl class="table">
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set denoising strength for all components. Default is 1.0. Must be in range [0.0, 100.0].
- </p>
- </dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>Set patch size for all planes. Default is 7. Must be odd number in range [0, 99].
- </p>
- </dd>
- <dt><samp class="option">r</samp></dt>
- <dd><p>Set research size. Default is 15. Must be odd number in range [0, 99].
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>Set parallelism. Default is 8. Must be a number in the range [1, 64].
- Larger values will use more VRAM but may not result in greater speed.
- The optimal value is hardware and input dependent.
- </p>
- </dd>
- <dt><samp class="option">s0</samp></dt>
- <dt><samp class="option">s1</samp></dt>
- <dt><samp class="option">s2</samp></dt>
- <dt><samp class="option">s3</samp></dt>
- <dd><p>Set denoising strength for a specific component. Default is <var class="var">1.0</var>, equal to <samp class="option">s</samp>.
- Must be in range [0.0, 100.0]. 0.0 disables denoising in that component.
- </p>
- </dd>
- <dt><samp class="option">p0</samp></dt>
- <dt><samp class="option">p1</samp></dt>
- <dt><samp class="option">p2</samp></dt>
- <dt><samp class="option">p3</samp></dt>
- <dd><p>Set patch size for a specific component. Default is <var class="var">7</var>, equal to <samp class="option">p</samp>.
- Must be odd number in range [0, 99].
- </p>
- </dd>
- </dl>
- <a name="overlay_005fvulkan"></a>
- <h3 class="section">44.11 overlay_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#overlay_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-overlay_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Overlay one video on top of another.
- </p>
- <p>It takes two inputs and has one output. The first input is the "main" video on which the second input is overlaid.
- This filter requires all inputs to use the same pixel format. So, format conversion may be needed.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">x</samp></dt>
- <dd><p>Set the x coordinate of the overlaid video on the main video.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">y</samp></dt>
- <dd><p>Set the y coordinate of the overlaid video on the main video.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- </dl>
- <a name="transpose_005fvulkan"></a>
- <h3 class="section">44.12 transpose_vulkan<span class="pull-right"><a class="anchor hidden-xs" href="#transpose_005fvulkan" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-transpose_005fvulkan" aria-hidden="true">TOC</a></span></h3>
- <p>Transpose rows with columns in the input video and optionally flip it.
- For more in depth examples see the <a class="ref" href="#transpose">transpose</a> video filter, which shares mostly the same options.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">dir</samp></dt>
- <dd><p>Specify the transposition direction.
- </p>
- <p>Can assume the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">cclock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise and vertically flip. (default)
- </p>
- </dd>
- <dt>‘<samp class="samp">clock</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">cclock</samp>’</dt>
- <dd><p>Rotate by 90 degrees counterclockwise.
- </p>
- </dd>
- <dt>‘<samp class="samp">clock_flip</samp>’</dt>
- <dd><p>Rotate by 90 degrees clockwise and vertically flip.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">passthrough</samp></dt>
- <dd><p>Do not apply the transposition if the input geometry matches the one
- specified by the specified value. It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Always apply transposition. (default)
- </p></dd>
- <dt>‘<samp class="samp">portrait</samp>’</dt>
- <dd><p>Preserve portrait geometry (when <var class="var">height</var> >= <var class="var">width</var>).
- </p></dd>
- <dt>‘<samp class="samp">landscape</samp>’</dt>
- <dd><p>Preserve landscape geometry (when <var class="var">width</var> >= <var class="var">height</var>).
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="QSV-Video-Filters"></a>
- <h2 class="chapter">45 QSV Video Filters<span class="pull-right"><a class="anchor hidden-xs" href="#QSV-Video-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-QSV-Video-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available QSV video filters.
- </p>
- <p>To enable compilation of these filters you need to configure FFmpeg with
- <code class="code">--enable-libmfx</code> or <code class="code">--enable-libvpl</code>.
- </p>
- <p>To use QSV filters, you need to setup the QSV device correctly. For more information, please read <a class="url" href="https://trac.ffmpeg.org/wiki/Hardware/QuickSync">https://trac.ffmpeg.org/wiki/Hardware/QuickSync</a>
- </p>
- <a name="hstack_005fqsv"></a>
- <h3 class="section">45.1 hstack_qsv<span class="pull-right"><a class="anchor hidden-xs" href="#hstack_005fqsv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-hstack_005fqsv" aria-hidden="true">TOC</a></span></h3>
- <p>Stack input videos horizontally.
- </p>
- <p>This is the QSV variant of the <a class="ref" href="#hstack">hstack</a> filter, each input stream may
- have different height, this filter will scale down/up each input stream while
- keeping the original aspect.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>See <a class="ref" href="#hstack">hstack</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#hstack">hstack</a>.
- </p>
- </dd>
- <dt><samp class="option">height</samp></dt>
- <dd><p>Set height of output. If set to 0, this filter will set height of output to
- height of the first input stream. Default value is 0.
- </p></dd>
- </dl>
- <a name="vstack_005fqsv"></a>
- <h3 class="section">45.2 vstack_qsv<span class="pull-right"><a class="anchor hidden-xs" href="#vstack_005fqsv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vstack_005fqsv" aria-hidden="true">TOC</a></span></h3>
- <p>Stack input videos vertically.
- </p>
- <p>This is the QSV variant of the <a class="ref" href="#vstack">vstack</a> filter, each input stream may
- have different width, this filter will scale down/up each input stream while
- keeping the original aspect.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>See <a class="ref" href="#vstack">vstack</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#vstack">vstack</a>.
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>Set width of output. If set to 0, this filter will set width of output to
- width of the first input stream. Default value is 0.
- </p></dd>
- </dl>
- <a name="xstack_005fqsv"></a>
- <h3 class="section">45.3 xstack_qsv<span class="pull-right"><a class="anchor hidden-xs" href="#xstack_005fqsv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xstack_005fqsv" aria-hidden="true">TOC</a></span></h3>
- <p>Stack video inputs into custom layout.
- </p>
- <p>This is the QSV variant of the <a class="ref" href="#xstack">xstack</a> filter.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">inputs</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p>
- </dd>
- <dt><samp class="option">layout</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- Moreover, this permits the user to supply output size for each input stream.
- </p><div class="example">
- <pre class="example-preformatted">xstack_qsv=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
- </pre></div>
- </dd>
- <dt><samp class="option">grid</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p>
- </dd>
- <dt><samp class="option">grid_tile_size</samp></dt>
- <dd><p>Set output size for each input stream when <samp class="option">grid</samp> is set. If this option
- is not set, this filter will set output size by default to the size of the
- first input stream. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">fill</samp></dt>
- <dd><p>See <a class="ref" href="#xstack">xstack</a>.
- </p></dd>
- </dl>
- <a name="Video-Sources"></a>
- <h2 class="chapter">46 Video Sources<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Sources" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Sources" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available video sources.
- </p>
- <a name="buffer"></a>
- <h3 class="section">46.1 buffer<span class="pull-right"><a class="anchor hidden-xs" href="#buffer" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-buffer" aria-hidden="true">TOC</a></span></h3>
- <p>Buffer video frames, and make them available to the filter chain.
- </p>
- <p>This source is mainly intended for a programmatic use, in particular
- through the interface defined in <samp class="file">libavfilter/buffersrc.h</samp>.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Specify the size (width and height) of the buffered video frames. For the
- syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>The input video width.
- </p>
- </dd>
- <dt><samp class="option">height</samp></dt>
- <dd><p>The input video height.
- </p>
- </dd>
- <dt><samp class="option">pix_fmt</samp></dt>
- <dd><p>A string representing the pixel format of the buffered video frames.
- It may be a number corresponding to a pixel format, or a pixel format
- name.
- </p>
- </dd>
- <dt><samp class="option">time_base</samp></dt>
- <dd><p>Specify the timebase assumed by the timestamps of the buffered frames.
- </p>
- </dd>
- <dt><samp class="option">frame_rate</samp></dt>
- <dd><p>Specify the frame rate expected for the video stream.
- </p>
- </dd>
- <dt><samp class="option">colorspace</samp></dt>
- <dd><p>A string representing the color space of the buffered video frames.
- It may be a number corresponding to a color space, or a color space
- name.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>A string representing the color range of the buffered video frames.
- It may be a number corresponding to a color range, or a color range
- name.
- </p>
- </dd>
- <dt><samp class="option">alpha_mode</samp></dt>
- <dd><p>A string representing the alpha mode of the buffered video frames.
- It may be a number corresponding to an alpha mode, or an alpha mode
- name.
- </p>
- </dd>
- <dt><samp class="option">pixel_aspect, sar</samp></dt>
- <dd><p>The sample (pixel) aspect ratio of the input video.
- </p>
- </dd>
- <dt><samp class="option">hw_frames_ctx</samp></dt>
- <dd><p>When using a hardware pixel format, this should be a reference to an
- AVHWFramesContext describing input frames.
- </p></dd>
- </dl>
- <p>For example:
- </p><div class="example">
- <pre class="example-preformatted">buffer=width=320:height=240:pix_fmt=yuv410p:time_base=1/24:sar=1
- </pre></div>
- <p>will instruct the source to accept video frames with size 320x240 and
- with format "yuv410p", assuming 1/24 as the timestamps timebase and
- square pixels (1:1 sample aspect ratio).
- Since the pixel format with name "yuv410p" corresponds to the number 6
- (check the enum AVPixelFormat definition in <samp class="file">libavutil/pixfmt.h</samp>),
- this example corresponds to:
- </p><div class="example">
- <pre class="example-preformatted">buffer=size=320x240:pixfmt=6:time_base=1/24:pixel_aspect=1/1
- </pre></div>
- <p>Alternatively, the options can be specified as a flat string, but this
- syntax is deprecated:
- </p>
- <p><var class="var">width</var>:<var class="var">height</var>:<var class="var">pix_fmt</var>:<var class="var">time_base.num</var>:<var class="var">time_base.den</var>:<var class="var">pixel_aspect.num</var>:<var class="var">pixel_aspect.den</var>
- </p>
- <a name="cellauto"></a>
- <h3 class="section">46.2 cellauto<span class="pull-right"><a class="anchor hidden-xs" href="#cellauto" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-cellauto" aria-hidden="true">TOC</a></span></h3>
- <p>Create a pattern generated by an elementary cellular automaton.
- </p>
- <p>The initial state of the cellular automaton can be defined through the
- <samp class="option">filename</samp> and <samp class="option">pattern</samp> options. If such options are
- not specified an initial state is created randomly.
- </p>
- <p>At each new frame a new row in the video is filled with the result of
- the cellular automaton next generation. The behavior when the whole
- frame is filled is defined by the <samp class="option">scroll</samp> option.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">filename, f</samp></dt>
- <dd><p>Read the initial cellular automaton state, i.e. the starting row, from
- the specified file.
- In the file, each non-whitespace character is considered an alive
- cell, a newline will terminate the row, and further characters in the
- file will be ignored.
- </p>
- </dd>
- <dt><samp class="option">pattern, p</samp></dt>
- <dd><p>Read the initial cellular automaton state, i.e. the starting row, from
- the specified string.
- </p>
- <p>Each non-whitespace character in the string is considered an alive
- cell, a newline will terminate the row, and further characters in the
- string will be ignored.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the video rate, that is the number of frames generated per second.
- Default is 25.
- </p>
- </dd>
- <dt><samp class="option">random_fill_ratio, ratio</samp></dt>
- <dd><p>Set the random fill ratio for the initial cellular automaton row. It
- is a floating point number value ranging from 0 to 1, defaults to
- 1/PHI.
- </p>
- <p>This option is ignored when a file or a pattern is specified.
- </p>
- </dd>
- <dt><samp class="option">random_seed, seed</samp></dt>
- <dd><p>Set the seed for filling randomly the initial row, must be an integer
- included between 0 and UINT32_MAX. If not specified, or if explicitly
- set to -1, the filter will try to use a good random seed on a best
- effort basis.
- </p>
- </dd>
- <dt><samp class="option">rule</samp></dt>
- <dd><p>Set the cellular automaton rule, it is a number ranging from 0 to 255.
- Default value is 110.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set the size of the output video. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- <p>If <samp class="option">filename</samp> or <samp class="option">pattern</samp> is specified, the size is set
- by default to the width of the specified initial state row, and the
- height is set to <var class="var">width</var> * PHI.
- </p>
- <p>If <samp class="option">size</samp> is set, it must contain the width of the specified
- pattern string, and the specified pattern will be centered in the
- larger row.
- </p>
- <p>If a filename or a pattern string is not specified, the size value
- defaults to "320x518" (used for a randomly generated initial state).
- </p>
- </dd>
- <dt><samp class="option">scroll</samp></dt>
- <dd><p>If set to 1, scroll the output upward when all the rows in the output
- have been already filled. If set to 0, the new generated row will be
- written over the top row just after the bottom row is filled.
- Defaults to 1.
- </p>
- </dd>
- <dt><samp class="option">start_full, full</samp></dt>
- <dd><p>If set to 1, completely fill the output with generated rows before
- outputting the first frame.
- This is the default behavior, for disabling set the value to 0.
- </p>
- </dd>
- <dt><samp class="option">stitch</samp></dt>
- <dd><p>If set to 1, stitch the left and right row edges together.
- This is the default behavior, for disabling set the value to 0.
- </p></dd>
- </dl>
- <a name="Examples-201"></a>
- <h4 class="subsection">46.2.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-201" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-201" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Read the initial state from <samp class="file">pattern</samp>, and specify an output of
- size 200x400.
- <div class="example">
- <pre class="example-preformatted">cellauto=f=pattern:s=200x400
- </pre></div>
- </li><li>Generate a random initial row with a width of 200 cells, with a fill
- ratio of 2/3:
- <div class="example">
- <pre class="example-preformatted">cellauto=ratio=2/3:s=200x200
- </pre></div>
- </li><li>Create a pattern generated by rule 18 starting by a single alive cell
- centered on an initial row with width 100:
- <div class="example">
- <pre class="example-preformatted">cellauto=p=@:s=100x400:full=0:rule=18
- </pre></div>
- </li><li>Specify a more elaborated initial pattern:
- <div class="example">
- <pre class="example-preformatted">cellauto=p='@@ @ @@':s=100x400:full=0:rule=18
- </pre></div>
- </li></ul>
- <a class="anchor" id="coreimagesrc"></a><a name="coreimagesrc-1"></a>
- <h3 class="section">46.3 coreimagesrc<span class="pull-right"><a class="anchor hidden-xs" href="#coreimagesrc-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-coreimagesrc-1" aria-hidden="true">TOC</a></span></h3>
- <p>Video source generated on GPU using Apple’s CoreImage API on OSX.
- </p>
- <p>This video source is a specialized version of the <a class="ref" href="#coreimage">coreimage</a> video filter.
- Use a core image generator at the beginning of the applied filterchain to
- generate the content.
- </p>
- <p>The coreimagesrc video source accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">list_generators</samp></dt>
- <dd><p>List all available generators along with all their respective options as well as
- possible minimum and maximum values along with the default values.
- </p><div class="example">
- <pre class="example-preformatted">list_generators=true
- </pre></div>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the size of the sourced video. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- The default value is <code class="code">320x240</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Specify the frame rate of the sourced video, as the number of frames
- generated per second. It has to be a string in the format
- <var class="var">frame_rate_num</var>/<var class="var">frame_rate_den</var>, an integer number, a floating point
- number or a valid video frame rate abbreviation. The default value is
- "25".
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>Set the sample aspect ratio of the sourced video.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the duration of the sourced video. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>If not specified, or the expressed duration is negative, the video is
- supposed to be generated forever.
- </p></dd>
- </dl>
- <p>Additionally, all options of the <a class="ref" href="#coreimage">coreimage</a> video filter are accepted.
- A complete filterchain can be used for further processing of the
- generated input without CPU-HOST transfer. See <a class="ref" href="#coreimage">coreimage</a> documentation
- and examples for details.
- </p>
- <a name="Examples-202"></a>
- <h4 class="subsection">46.3.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-202" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-202" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Use CIQRCodeGenerator to create a QR code for the FFmpeg homepage,
- given as complete and escaped command-line for Apple’s standard bash shell:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i coreimagesrc=s=100x100:filter=CIQRCodeGenerator@inputMessage=https\\\\\://FFmpeg.org/@inputCorrectionLevel=H -frames:v 1 QRCode.png
- </pre></div>
- <p>This example is equivalent to the QRCode example of <a class="ref" href="#coreimage">coreimage</a> without the
- need for a nullsrc video source.
- </p></li></ul>
- <a name="ddagrab"></a>
- <h3 class="section">46.4 ddagrab<span class="pull-right"><a class="anchor hidden-xs" href="#ddagrab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ddagrab" aria-hidden="true">TOC</a></span></h3>
- <p>Captures the Windows Desktop via Desktop Duplication API.
- </p>
- <p>The filter exclusively returns D3D11 Hardware Frames, for on-gpu encoding
- or processing. So an explicit <a class="ref" href="#hwdownload">hwdownload</a> is needed for any kind of
- software processing.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">output_idx</samp></dt>
- <dd><p>DXGI Output Index to capture.
- </p>
- <p>Usually corresponds to the index Windows has given the screen minus one,
- so it’s starting at 0.
- </p>
- <p>Defaults to output 0.
- </p>
- </dd>
- <dt><samp class="option">draw_mouse</samp></dt>
- <dd><p>Whether to draw the mouse cursor.
- </p>
- <p>Defaults to true.
- </p>
- <p>Only affects hardware cursors. If a game or application renders its own cursor,
- it’ll always be captured.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>Maximum framerate at which the desktop will be captured - the interval between
- successive frames will not be smaller than the inverse of the framerate. When
- <var class="var">dup_frames</var> is true (the default) and the desktop is not being updated
- often enough, the filter will duplicate a previous frame. Note that there is no
- background buffering going on, so when the filter is not polled often enough
- then the actual inter-frame interval may be significantly larger.
- </p>
- <p>Defaults to 30 FPS.
- </p>
- </dd>
- <dt><samp class="option">video_size</samp></dt>
- <dd><p>Specify the size of the captured video.
- </p>
- <p>Defaults to the full size of the screen.
- </p>
- <p>Cropped from the bottom/right if smaller than screen size.
- </p>
- </dd>
- <dt><samp class="option">offset_x</samp></dt>
- <dd><p>Horizontal offset of the captured video.
- </p>
- </dd>
- <dt><samp class="option">offset_y</samp></dt>
- <dd><p>Vertical offset of the captured video.
- </p>
- </dd>
- <dt><samp class="option">output_fmt</samp></dt>
- <dd><p>Desired filter output format.
- Defaults to 8 Bit BGRA.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Passes all supported output formats to DDA and returns what DDA decides to use.
- </p></dd>
- <dt>‘<samp class="samp">8bit</samp>’</dt>
- <dt>‘<samp class="samp">bgra</samp>’</dt>
- <dd><p>8 Bit formats always work, and DDA will convert to them if necessary.
- </p></dd>
- <dt>‘<samp class="samp">10bit</samp>’</dt>
- <dt>‘<samp class="samp">x2bgr10</samp>’</dt>
- <dd><p>Filter initialization will fail if 10 bit format is requested but unavailable.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dup_frames</samp></dt>
- <dd><p>When this option is set to true (the default), the filter will duplicate frames
- when the desktop has not been updated in order to maintain approximately
- constant target framerate. When this option is set to false, the filter will
- wait for the desktop to be updated (inter-frame intervals may vary significantly
- in this case).
- </p>
- </dd>
- </dl>
- <a name="Examples-203"></a>
- <h4 class="subsection">46.4.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-203" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-203" aria-hidden="true">TOC</a></span></h4>
- <p>Capture primary screen and encode using nvenc:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -f lavfi -i ddagrab -c:v h264_nvenc -cq 18 output.mp4
- </pre></div>
- <p>You can also skip the lavfi device and directly use the filter.
- Also demonstrates downloading the frame and encoding with libx264.
- Explicit output format specification is required in this case:
- </p><div class="example">
- <pre class="example-preformatted">ffmpeg -filter_complex ddagrab=output_idx=1:framerate=60,hwdownload,format=bgra -c:v libx264 -crf 18 output.mp4
- </pre></div>
- <p>If you want to capture only a subsection of the desktop, this can be achieved
- by specifying a smaller size and its offsets into the screen:
- </p><div class="example">
- <pre class="example-preformatted">ddagrab=video_size=800x600:offset_x=100:offset_y=100
- </pre></div>
- <a name="gfxcapture"></a>
- <h3 class="section">46.5 gfxcapture<span class="pull-right"><a class="anchor hidden-xs" href="#gfxcapture" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gfxcapture" aria-hidden="true">TOC</a></span></h3>
- <p>Capture windows or monitors using Windows.Graphics.Capture API.
- </p>
- <p>This source provides low overhead capture of application windows or entire monitors.
- The filter outputs hardware frames in <code class="code">d3d11</code> format; use <code class="code">hwdownload,format=</code>
- if system memory frames are required.
- </p>
- <p>The window to be captured can be selected via regular expressions on its title,
- class name or backing executable name, by explicit native handles, or by monitor
- index or explicit native handle. A window must match all provided expressions to be
- selected. The first matching window will be picked, in whatever order Windows
- returns them.
- </p>
- <p>Explicit handles (<samp class="option">hwnd</samp>, <samp class="option">hmonitor</samp>) override pattern or index
- based selection. If neither handles nor a monitor index are given, the first
- window matching the provided regular expressions is captured.
- </p>
- <p>This source does NOT hold a stable FPS. It returns frames at whatever rate the compositor
- provides them, only capped by the <samp class="option">max_framerate</samp>.
- If you need a stable rate, you need to add an fps filter to drop/duplicate frames as needed.
- </p>
- <p>If the capture source disappears mid-capture (window closed, monitor disconnected), the filter will return EOF.
- </p>
- <p>This source accepts the following options:
- </p><dl class="table">
- <dt><samp class="option">window_title</samp></dt>
- <dd><p>ECMAScript regular expression matched against the window title. Supports a
- PCRE style <code class="code">(?i)</code> prefix for case-insensitive matching.
- </p>
- </dd>
- <dt><samp class="option">window_class</samp></dt>
- <dd><p>As <samp class="option">window_title</samp>, but matched against the window class name.
- </p>
- </dd>
- <dt><samp class="option">window_exe</samp></dt>
- <dd><p>As <samp class="option">window_title</samp>, but matched against the executable file name of the
- window’s process.
- </p>
- </dd>
- <dt><samp class="option">monitor_idx</samp></dt>
- <dd><p>Zero-based index of the monitor to capture.
- </p>
- <p>Can also be set to <code class="code">window</code> to capture the monitor the selected window
- is displayed on at filter initialization time.
- </p>
- </dd>
- <dt><samp class="option">hwnd</samp></dt>
- <dd><p>Explicit native window handle (HWND).
- </p>
- </dd>
- <dt><samp class="option">hmonitor</samp></dt>
- <dd><p>Explicit native monitor handle (HMONITOR).
- </p>
- </dd>
- <dt><samp class="option">capture_cursor</samp></dt>
- <dd><p>Capture the mouse cursor. Enabled by default.
- </p>
- </dd>
- <dt><samp class="option">capture_border</samp></dt>
- <dd><p>Capture the full area of the window, including its window decorarions/border.
- Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">display_border</samp></dt>
- <dd><p>Draw a yellow highlight border around the captured window. Disabled by default.
- </p>
- </dd>
- <dt><samp class="option">max_framerate</samp></dt>
- <dd><p>Maximum capture frame rate. Accepts a video rate (e.g. <code class="code">30</code>, <code class="code">60/1</code>,
- <code class="code">24000/1001</code>). The default is <code class="code">60</code> FPS.
- The actual rate is the rate at which the compositor renders the window/monitor,
- capped by this option.
- </p>
- </dd>
- <dt><samp class="option">width</samp></dt>
- <dd><p>Force the output canvas width. If zero (default) the initial captured source
- width is used. If a negative number is provided, the width will be rounded
- down to the next multiple of that number.
- </p>
- <p>See <samp class="option">resize_mode</samp>.
- </p>
- </dd>
- <dt><samp class="option">height</samp></dt>
- <dd><p>Force the output canvas height. If zero (default) the initial captured source
- height is used. If a negative number is provided, the height will be rounded
- down to the next multiple of that number.
- </p>
- <p>See <samp class="option">resize_mode</samp>.
- </p>
- </dd>
- <dt><samp class="option">crop_left</samp></dt>
- <dd><p>Crop this many pixels from the left side of the captured frames.
- </p>
- </dd>
- <dt><samp class="option">crop_top</samp></dt>
- <dd><p>Crop this many pixels from the left side of the captured frames.
- </p>
- </dd>
- <dt><samp class="option">crop_right</samp></dt>
- <dd><p>Crop this many pixels from the left side of the captured frames.
- </p>
- </dd>
- <dt><samp class="option">crop_bottom</samp></dt>
- <dd><p>Crop this many pixels from the left side of the captured frames.
- </p>
- </dd>
- <dt><samp class="option">premultiplied</samp></dt>
- <dd><p>If set to 1, return frames with premultiplied alpha. Default is 0 (straight
- alpha).
- </p>
- </dd>
- <dt><samp class="option">resize_mode</samp></dt>
- <dd><p>Defines how the captured content is fitted into the output canvas size.
- Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">crop</samp>’</dt>
- <dd><p>Crop (or pad with black) to the canvas size. (default)
- </p></dd>
- <dt>‘<samp class="samp">scale</samp>’</dt>
- <dd><p>Scale the source to fill the canvas, potentially altering aspect ratio.
- </p></dd>
- <dt>‘<samp class="samp">scale_aspect</samp>’</dt>
- <dd><p>Scale the source to fit inside the canvas while preserving aspect ratio.
- Remaining area is filled with black.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">scale_mode</samp></dt>
- <dd><p>Scaling algorithm used when resizing is required.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">point</samp>’</dt>
- <dd><p>Nearest neighbour (pixelated) scaling.
- </p></dd>
- <dt>‘<samp class="samp">bilinear</samp>’</dt>
- <dd><p>Bilinear filtering. (default)
- </p></dd>
- <dt>‘<samp class="samp">bicubic</samp>’</dt>
- <dd><p>Bicubic filtering. Potentially more blurry, but fewer scaling artifacts depending on contents.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">output_fmt</samp></dt>
- <dd><p>Desired output pixel format inside the D3D11 hardware frames.
- </p>
- <p>Possible values:
- </p><dl class="table">
- <dt>‘<samp class="samp">bgra</samp>’</dt>
- <dt>‘<samp class="samp">8bit</samp>’</dt>
- <dd><p>8 bit BGRA output (default)
- </p></dd>
- <dt>‘<samp class="samp">x2bgr10</samp>’</dt>
- <dt>‘<samp class="samp">10bit</samp>’</dt>
- <dd><p>10 bit BGR output
- </p></dd>
- <dt>‘<samp class="samp">rgbaf16</samp>’</dt>
- <dt>‘<samp class="samp">16bit</samp>’</dt>
- <dd><p>16bit float RGBA output
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-204"></a>
- <h4 class="subsection">46.5.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-204" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-204" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Capture a window by title (case-insensitive) at a maximum of 60 fps:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -filter_complex gfxcapture=window_title='(?i)My Application':max_framerate=60,hwdownload,format=bgra,format=yuv420p -c:v libx264 -crf 15 capture.mp4
- </pre></div>
- </li><li>Capture monitor 1 at native refresh, 10bit color depth, scale to 1920x1080 preserving aspect:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -filter_complex gfxcapture=monitor_idx=1:width=1920:height=1080:resize_mode=scale_aspect:output_fmt=10bit -c:v hevc_nvenc -cq 15 capture.mp4
- </pre></div>
- </li><li>Capture a window by executable name, draw border, force point scaling, fixed 60 fps:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -filter_complex gfxcapture=window_exe='^firefox.exe$':display_border=1:scale_mode=point,fps=60 -rc qvbr -qvbr_quality_level 15 -c:v h264_amf capture.mp4
- </pre></div>
- </li></ul>
- <a name="gradients"></a>
- <h3 class="section">46.6 gradients<span class="pull-right"><a class="anchor hidden-xs" href="#gradients" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gradients" aria-hidden="true">TOC</a></span></h3>
- <p>Generate several gradients.
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set frame size. For the syntax of this option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video
- size" section in the ffmpeg-utils manual</a>. Default value is "640x480".
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">c0, c1, c2, c3, c4, c5, c6, c7</samp></dt>
- <dd><p>Set 8 colors. Default values for colors is to pick random one.
- </p>
- </dd>
- <dt><samp class="option">x0, y0, y0, y1</samp></dt>
- <dd><p>Set gradient line source and destination points. If negative or out of range, random ones
- are picked.
- </p>
- </dd>
- <dt><samp class="option">nb_colors, n</samp></dt>
- <dd><p>Set number of colors to use at once. Allowed range is from 2 to 8. Default value is 2.
- </p>
- </dd>
- <dt><samp class="option">seed</samp></dt>
- <dd><p>Set seed for picking gradient line points.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the duration of the sourced video. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>If not specified, or the expressed duration is negative, the video is
- supposed to be generated forever.
- </p>
- </dd>
- <dt><samp class="option">speed</samp></dt>
- <dd><p>Set speed of gradients rotation.
- </p>
- </dd>
- <dt><samp class="option">type, t</samp></dt>
- <dd><p>Set type of gradients.
- Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">linear</samp>’</dt>
- <dt>‘<samp class="samp">radial</samp>’</dt>
- <dt>‘<samp class="samp">circular</samp>’</dt>
- <dt>‘<samp class="samp">spiral</samp>’</dt>
- <dt>‘<samp class="samp">square</samp>’</dt>
- </dl>
- <p>Default type is <var class="var">linear</var>.
- </p></dd>
- </dl>
- <a name="Commands-156"></a>
- <h4 class="subsection">46.6.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-156" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-156" aria-hidden="true">TOC</a></span></h4>
- <p>This source supports the some above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="mandelbrot"></a>
- <h3 class="section">46.7 mandelbrot<span class="pull-right"><a class="anchor hidden-xs" href="#mandelbrot" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mandelbrot" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a Mandelbrot set fractal, and progressively zoom towards the
- point specified with <var class="var">start_x</var> and <var class="var">start_y</var>.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">end_pts</samp></dt>
- <dd><p>Set the terminal pts value. Default value is 400.
- </p>
- </dd>
- <dt><samp class="option">end_scale</samp></dt>
- <dd><p>Set the terminal scale value.
- Must be a floating point value. Default value is 0.3.
- </p>
- </dd>
- <dt><samp class="option">inner</samp></dt>
- <dd><p>Set the inner coloring mode, that is the algorithm used to draw the
- Mandelbrot fractal internal region.
- </p>
- <p>It shall assume one of the following values:
- </p><dl class="table">
- <dt><samp class="option">black</samp></dt>
- <dd><p>Set black mode.
- </p></dd>
- <dt><samp class="option">convergence</samp></dt>
- <dd><p>Show time until convergence.
- </p></dd>
- <dt><samp class="option">mincol</samp></dt>
- <dd><p>Set color based on point closest to the origin of the iterations.
- </p></dd>
- <dt><samp class="option">period</samp></dt>
- <dd><p>Set period mode.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">mincol</var>.
- </p>
- </dd>
- <dt><samp class="option">bailout</samp></dt>
- <dd><p>Set the bailout value. Default value is 10.0.
- </p>
- </dd>
- <dt><samp class="option">maxiter</samp></dt>
- <dd><p>Set the maximum of iterations performed by the rendering
- algorithm. Default value is 7189.
- </p>
- </dd>
- <dt><samp class="option">outer</samp></dt>
- <dd><p>Set outer coloring mode.
- It shall assume one of following values:
- </p><dl class="table">
- <dt><samp class="option">iteration_count</samp></dt>
- <dd><p>Set iteration count mode.
- </p></dd>
- <dt><samp class="option">normalized_iteration_count</samp></dt>
- <dd><p>set normalized iteration count mode.
- </p></dd>
- </dl>
- <p>Default value is <var class="var">normalized_iteration_count</var>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set frame size. For the syntax of this option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video
- size" section in the ffmpeg-utils manual</a>. Default value is "640x480".
- </p>
- </dd>
- <dt><samp class="option">start_scale</samp></dt>
- <dd><p>Set the initial scale value. Default value is 3.0.
- </p>
- </dd>
- <dt><samp class="option">start_x</samp></dt>
- <dd><p>Set the initial x position. Must be a floating point value between
- -100 and 100. Default value is -0.743643887037158704752191506114774.
- </p>
- </dd>
- <dt><samp class="option">start_y</samp></dt>
- <dd><p>Set the initial y position. Must be a floating point value between
- -100 and 100. Default value is -0.131825904205311970493132056385139.
- </p></dd>
- </dl>
- <a name="mptestsrc"></a>
- <h3 class="section">46.8 mptestsrc<span class="pull-right"><a class="anchor hidden-xs" href="#mptestsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-mptestsrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate various test patterns, as generated by the MPlayer test filter.
- </p>
- <p>The size of the generated video is fixed, and is 512x512.
- This source is useful in particular for testing encoding features.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Specify the frame rate of the sourced video, as the number of frames
- generated per second. It has to be a string in the format
- <var class="var">frame_rate_num</var>/<var class="var">frame_rate_den</var>, an integer number, a floating point
- number or a valid video frame rate abbreviation. The default value is
- "25".
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the duration of the sourced video. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>If not specified, or the expressed duration is negative, the video is
- supposed to be generated forever.
- </p>
- </dd>
- <dt><samp class="option">test, t</samp></dt>
- <dd>
- <p>Set the number or the name of the test to perform. Supported tests are:
- </p><dl class="table">
- <dt><samp class="option">dc_luma</samp></dt>
- <dt><samp class="option">dc_chroma</samp></dt>
- <dt><samp class="option">freq_luma</samp></dt>
- <dt><samp class="option">freq_chroma</samp></dt>
- <dt><samp class="option">amp_luma</samp></dt>
- <dt><samp class="option">amp_chroma</samp></dt>
- <dt><samp class="option">cbp</samp></dt>
- <dt><samp class="option">mv</samp></dt>
- <dt><samp class="option">ring1</samp></dt>
- <dt><samp class="option">ring2</samp></dt>
- <dt><samp class="option">all</samp></dt>
- <dt><samp class="option">max_frames, m</samp></dt>
- <dd><p>Set the maximum number of frames generated for each test, default value is 30.
- </p>
- </dd>
- </dl>
- <p>Default value is "all", which will cycle through the list of all tests.
- </p></dd>
- </dl>
- <p>Some examples:
- </p><div class="example">
- <pre class="example-preformatted">mptestsrc=t=dc_luma
- </pre></div>
- <p>will generate a "dc_luma" test pattern.
- </p>
- <a name="frei0r_005fsrc"></a>
- <h3 class="section">46.9 frei0r_src<span class="pull-right"><a class="anchor hidden-xs" href="#frei0r_005fsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-frei0r_005fsrc" aria-hidden="true">TOC</a></span></h3>
- <p>Provide a frei0r source.
- </p>
- <p>To enable compilation of this filter you need to install the frei0r
- header and configure FFmpeg with <code class="code">--enable-frei0r</code>.
- </p>
- <p>This source accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">size</samp></dt>
- <dd><p>The size of the video to generate. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">framerate</samp></dt>
- <dd><p>The framerate of the generated video. It may be a string of the form
- <var class="var">num</var>/<var class="var">den</var> or a frame rate abbreviation.
- </p>
- </dd>
- <dt><samp class="option">filter_name</samp></dt>
- <dd><p>The name to the frei0r source to load. For more information regarding frei0r and
- how to set the parameters, read the <a class="ref" href="#frei0r">frei0r</a> section in the video filters
- documentation.
- </p>
- </dd>
- <dt><samp class="option">filter_params</samp></dt>
- <dd><p>A ’|’-separated list of parameters to pass to the frei0r source.
- </p>
- </dd>
- </dl>
- <p>For example, to generate a frei0r partik0l source with size 200x200
- and frame rate 10 which is overlaid on the overlay filter main input:
- </p><div class="example">
- <pre class="example-preformatted">frei0r_src=size=200x200:framerate=10:filter_name=partik0l:filter_params=1234 [overlay]; [in][overlay] overlay
- </pre></div>
- <a name="life"></a>
- <h3 class="section">46.10 life<span class="pull-right"><a class="anchor hidden-xs" href="#life" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-life" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a life pattern.
- </p>
- <p>This source is based on a generalization of John Conway’s life game.
- </p>
- <p>The sourced input represents a life grid, each pixel represents a cell
- which can be in one of two possible states, alive or dead. Every cell
- interacts with its eight neighbours, which are the cells that are
- horizontally, vertically, or diagonally adjacent.
- </p>
- <p>At each interaction the grid evolves according to the adopted rule,
- which specifies the number of neighbor alive cells which will make a
- cell stay alive or born. The <samp class="option">rule</samp> option allows one to specify
- the rule to adopt.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">filename, f</samp></dt>
- <dd><p>Set the file from which to read the initial grid state. In the file,
- each non-whitespace character is considered an alive cell, and newline
- is used to delimit the end of each row.
- </p>
- <p>If this option is not specified, the initial grid is generated
- randomly.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the video rate, that is the number of frames generated per second.
- Default is 25.
- </p>
- </dd>
- <dt><samp class="option">random_fill_ratio, ratio</samp></dt>
- <dd><p>Set the random fill ratio for the initial random grid. It is a
- floating point number value ranging from 0 to 1, defaults to 1/PHI.
- It is ignored when a file is specified.
- </p>
- </dd>
- <dt><samp class="option">random_seed, seed</samp></dt>
- <dd><p>Set the seed for filling the initial random grid, must be an integer
- included between 0 and UINT32_MAX. If not specified, or if explicitly
- set to -1, the filter will try to use a good random seed on a best
- effort basis.
- </p>
- </dd>
- <dt><samp class="option">rule</samp></dt>
- <dd><p>Set the life rule.
- </p>
- <p>A rule can be specified with a code of the kind "S<var class="var">NS</var>/B<var class="var">NB</var>",
- where <var class="var">NS</var> and <var class="var">NB</var> are sequences of numbers in the range 0-8,
- <var class="var">NS</var> specifies the number of alive neighbor cells which make a
- live cell stay alive, and <var class="var">NB</var> the number of alive neighbor cells
- which make a dead cell to become alive (i.e. to "born").
- "s" and "b" can be used in place of "S" and "B", respectively.
- </p>
- <p>Alternatively a rule can be specified by an 18-bits integer. The 9
- high order bits are used to encode the next cell state if it is alive
- for each number of neighbor alive cells, the low order bits specify
- the rule for "borning" new cells. Higher order bits encode for an
- higher number of neighbor cells.
- For example the number 6153 = <code class="code">(12<<9)+9</code> specifies a stay alive
- rule of 12 and a born rule of 9, which corresponds to "S23/B03".
- </p>
- <p>Default value is "S23/B3", which is the original Conway’s game of life
- rule, and will keep a cell alive if it has 2 or 3 neighbor alive
- cells, and will born a new cell if there are three alive cells around
- a dead cell.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set the size of the output video. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- </p>
- <p>If <samp class="option">filename</samp> is specified, the size is set by default to the
- same size of the input file. If <samp class="option">size</samp> is set, it must contain
- the size specified in the input file, and the initial grid defined in
- that file is centered in the larger resulting area.
- </p>
- <p>If a filename is not specified, the size value defaults to "320x240"
- (used for a randomly generated initial grid).
- </p>
- </dd>
- <dt><samp class="option">stitch</samp></dt>
- <dd><p>If set to 1, stitch the left and right grid edges together, and the
- top and bottom edges also. Defaults to 1.
- </p>
- </dd>
- <dt><samp class="option">mold</samp></dt>
- <dd><p>Set cell mold speed. If set, a dead cell will go from <samp class="option">death_color</samp> to
- <samp class="option">mold_color</samp> with a step of <samp class="option">mold</samp>. <samp class="option">mold</samp> can have a
- value from 0 to 255.
- </p>
- </dd>
- <dt><samp class="option">life_color</samp></dt>
- <dd><p>Set the color of living (or new born) cells.
- </p>
- </dd>
- <dt><samp class="option">death_color</samp></dt>
- <dd><p>Set the color of dead cells. If <samp class="option">mold</samp> is set, this is the first color
- used to represent a dead cell.
- </p>
- </dd>
- <dt><samp class="option">mold_color</samp></dt>
- <dd><p>Set mold color, for definitely dead and moldy cells.
- </p>
- <p>For the syntax of these 3 color options, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the
- ffmpeg-utils manual</a>.
- </p></dd>
- </dl>
- <a name="Examples-205"></a>
- <h4 class="subsection">46.10.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-205" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-205" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Read a grid from <samp class="file">pattern</samp>, and center it on a grid of size
- 300x300 pixels:
- <div class="example">
- <pre class="example-preformatted">life=f=pattern:s=300x300
- </pre></div>
- </li><li>Generate a random grid of size 200x200, with a fill ratio of 2/3:
- <div class="example">
- <pre class="example-preformatted">life=ratio=2/3:s=200x200
- </pre></div>
- </li><li>Specify a custom rule for evolving a randomly generated grid:
- <div class="example">
- <pre class="example-preformatted">life=rule=S14/B34
- </pre></div>
- </li><li>Full example with slow death effect (mold) using <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi life=s=300x200:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800:flags=16
- </pre></div>
- </li></ul>
- <a name="perlin"></a>
- <h3 class="section">46.11 perlin<span class="pull-right"><a class="anchor hidden-xs" href="#perlin" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-perlin" aria-hidden="true">TOC</a></span></h3>
- <p>Generate Perlin noise.
- </p>
- <p>Perlin noise is a kind of noise with local continuity in space. This
- can be used to generate patterns with continuity in space and time,
- e.g. to simulate smoke, fluids, or terrain.
- </p>
- <p>In case more than one octave is specified through the <samp class="option">octaves</samp>
- option, Perlin noise is generated as a sum of components, each one
- with doubled frequency. In this case the <samp class="option">persistence</samp> option
- specify the ratio of the amplitude with respect to the previous
- component. More octave components enable to specify more high
- frequency details in the generated noise (e.g. small size variations
- due to boulders in a generated terrain).
- </p>
- <a name="Options-126"></a>
- <h4 class="subsection">46.11.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-126" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-126" aria-hidden="true">TOC</a></span></h4>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the size (width and height) of the buffered video frames. For the
- syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">320x240</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Specify the frame rate expected for the video stream, expressed as a
- number of frames per second. Default value is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">octaves</samp></dt>
- <dd><p>Specify the total number of components making up the noise, each one
- with doubled frequency. Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">persistence</samp></dt>
- <dd><p>Set the ratio used to compute the amplitude of the next octave
- component with respect to the previous component amplitude. Default
- value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">xscale</samp></dt>
- <dt><samp class="option">yscale</samp></dt>
- <dd><p>Define a scale factor used to multiple the x, y coordinates. This can
- be useful to define an effect with a pattern stretched along the x or
- y axis. Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">tscale</samp></dt>
- <dd><p>Define a scale factor used to multiple the time coordinate. This can
- be useful to change the time variation speed. Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">random_mode</samp></dt>
- <dd><p>Set random mode used to compute initial pattern.
- </p>
- <p>Supported values are:
- </p><dl class="table">
- <dt><samp class="option">random</samp></dt>
- <dd><p>Compute and use random seed.
- </p>
- </dd>
- <dt><samp class="option">ken</samp></dt>
- <dd><p>Use the predefined initial pattern defined by Ken Perlin in the
- original article, can be useful to compare the output with other
- sources.
- </p>
- </dd>
- <dt><samp class="option">seed</samp></dt>
- <dd><p>Use the value specified by <samp class="option">random_seed</samp> option.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">random</code>.
- </p>
- </dd>
- <dt><samp class="option">random_seed, seed</samp></dt>
- <dd><p>When <samp class="option">random_mode</samp> is set to <var class="var">random_seed</var>, use this value
- to compute the initial pattern. Default value is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="Examples-206"></a>
- <h4 class="subsection">46.11.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-206" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-206" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate single component:
- <div class="example">
- <pre class="example-preformatted">perlin
- </pre></div>
- </li><li>Use Perlin noise with 7 components, each one with a halved contribution
- to total amplitude:
- <div class="example">
- <pre class="example-preformatted">perlin=octaves=7:persistence=0.5
- </pre></div>
- </li><li>Chain Perlin noise with the <a class="ref" href="#lutyuv">lutyuv</a> to generate a black&white
- effect:
- <div class="example">
- <pre class="example-preformatted">perlin=octaves=3:tscale=0.3,lutyuv=y='if(lt(val\,128)\,255\,0)'
- </pre></div>
- </li><li>Stretch noise along the y axis, and convert gray level to red-only
- signal:
- <div class="example">
- <pre class="example-preformatted">perlin=octaves=7:tscale=0.4:yscale=0.3,lutrgb=r=val:b=0:g=0
- </pre></div>
- </li></ul>
- <a name="qrencodesrc"></a>
- <h3 class="section">46.12 qrencodesrc<span class="pull-right"><a class="anchor hidden-xs" href="#qrencodesrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-qrencodesrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a QR code using the libqrencode library (see
- <a class="url" href="https://fukuchi.org/works/qrencode/">https://fukuchi.org/works/qrencode/</a>).
- </p>
- <p>To enable the compilation of this source, you need to configure FFmpeg with
- <code class="code">--enable-libqrencode</code>.
- </p>
- <p>The QR code is generated from the provided text or text pattern. The
- corresponding QR code is scaled and put in the video output according to the
- specified output size options.
- </p>
- <p>In case no text is specified, the QR code is not generated, but an empty colored
- output is returned instead.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">qrcode_width, q</samp></dt>
- <dt><samp class="option">padded_qrcode_width, Q</samp></dt>
- <dd><p>Specify an expression for the width of the rendered QR code, with and without
- padding. The <var class="var">qrcode_width</var> expression can reference the value set by the
- <var class="var">padded_qrcode_width</var> expression, and vice versa.
- By default <var class="var">padded_qrcode_width</var> is set to <var class="var">qrcode_width</var>, meaning that
- there is no padding.
- </p>
- <p>These expressions are evaluated only once, when initializing the source.
- See the <a class="ref" href="#qrencode_005fexpressions">qrencode Expressions</a> section for details.
- </p>
- <p>Note that some of the constants are missing for the source (for example the
- <var class="var">x</var> or <var class="var">t</var> or ¸<var class="var">n</var>), since they only makes sense when evaluating the
- expression for each frame rather than at initialization time.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Specify the frame rate of the sourced video, as the number of frames
- generated per second. It has to be a string in the format
- <var class="var">frame_rate_num</var>/<var class="var">frame_rate_den</var>, an integer number, a floating point
- number or a valid video frame rate abbreviation. The default value is
- "25".
- </p>
- </dd>
- <dt><samp class="option">case_sensitive, cs</samp></dt>
- <dd><p>Instruct libqrencode to use case sensitive encoding. This is enabled by
- default. This can be disabled to reduce the QR encoding size.
- </p>
- </dd>
- <dt><samp class="option">level, l</samp></dt>
- <dd><p>Specify the QR encoding error correction level. With an higher correction level,
- the encoding size will increase but the code will be more robust to corruption.
- Lower level is <var class="var">L</var>.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">L</samp>’</dt>
- <dt>‘<samp class="samp">M</samp>’</dt>
- <dt>‘<samp class="samp">Q</samp>’</dt>
- <dt>‘<samp class="samp">H</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">expansion</samp></dt>
- <dd><p>Select how the input text is expanded. Can be either <code class="code">none</code>, or
- <code class="code">normal</code> (default). See the <a class="ref" href="#qrencode_005ftext_005fexpansion">qrencode Text expansion</a>
- section for details.
- </p>
- </dd>
- <dt><samp class="option">text</samp></dt>
- <dt><samp class="option">textfile</samp></dt>
- <dd><p>Define the text to be rendered. In case neither is specified, no QR is encoded
- (just an empty colored frame).
- </p>
- <p>In case expansion is enabled, the text is treated as a text template, using the
- qrencode expansion mechanism. See the <a class="ref" href="#qrencode_005ftext_005fexpansion">qrencode
- Text expansion</a> section for details.
- </p>
- </dd>
- <dt><samp class="option">background_color, bc</samp></dt>
- <dt><samp class="option">foreground_color, fc</samp></dt>
- <dd><p>Set the QR code and background color. The default value of
- <var class="var">foreground_color</var> is "black", the default value of <var class="var">background_color</var>
- is "white".
- </p>
- <p>For the syntax of the color options, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color"
- section in the ffmpeg-utils manual</a>.
- </p></dd>
- </dl>
- <a name="Examples-207"></a>
- <h4 class="subsection">46.12.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-207" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-207" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate a QR code encoding the specified text with the default size:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=www.ffmpeg.org
- </pre></div>
- </li><li>Same as below, but select blue on pink colors:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=www.ffmpeg.org:bc=pink:fc=blue
- </pre></div>
- </li><li>Generate a QR code with width of 200 pixels and padding, making the padded width
- 4/3 of the QR code width:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=www.ffmpeg.org:q=200:Q=4/3*q
- </pre></div>
- </li><li>Generate a QR code with padded width of 200 pixels and padding, making the QR
- code width 3/4 of the padded width:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=www.ffmpeg.org:Q=200:q=3/4*Q
- </pre></div>
- </li><li>Generate a QR code encoding the frame number:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=%{n}
- </pre></div>
- </li><li>Generate a QR code encoding the GMT timestamp:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=%{gmtime}
- </pre></div>
- </li><li>Generate a QR code encoding the timestamp expressed as a float:
- <div class="example">
- <pre class="example-preformatted">qrencodesrc=text=%{pts}
- </pre></div>
- </li></ul>
- <a class="anchor" id="allrgb"></a><a class="anchor" id="allyuv"></a><a class="anchor" id="color"></a><a class="anchor" id="colorchart"></a><a class="anchor" id="colorspectrum"></a><a class="anchor" id="haldclutsrc"></a><a class="anchor" id="nullsrc"></a><a class="anchor" id="pal75bars"></a><a class="anchor" id="pal100bars"></a><a class="anchor" id="rgbtestsrc"></a><a class="anchor" id="smptebars"></a><a class="anchor" id="smptehdbars"></a><a class="anchor" id="testsrc"></a><a class="anchor" id="testsrc2"></a><a class="anchor" id="yuvtestsrc"></a><a name="allrgb_002c-allyuv_002c-color_002c-colorchart_002c-colorspectrum_002c-haldclutsrc_002c-nullsrc_002c-pal75bars_002c-pal100bars_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc"></a>
- <h3 class="section">46.13 allrgb, allyuv, color, colorchart, colorspectrum, haldclutsrc, nullsrc, pal75bars, pal100bars, rgbtestsrc, smptebars, smptehdbars, testsrc, testsrc2, yuvtestsrc<span class="pull-right"><a class="anchor hidden-xs" href="#allrgb_002c-allyuv_002c-color_002c-colorchart_002c-colorspectrum_002c-haldclutsrc_002c-nullsrc_002c-pal75bars_002c-pal100bars_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-allrgb_002c-allyuv_002c-color_002c-colorchart_002c-colorspectrum_002c-haldclutsrc_002c-nullsrc_002c-pal75bars_002c-pal100bars_002c-rgbtestsrc_002c-smptebars_002c-smptehdbars_002c-testsrc_002c-testsrc2_002c-yuvtestsrc" aria-hidden="true">TOC</a></span></h3>
- <p>The <code class="code">allrgb</code> source returns frames of size 4096x4096 of all rgb colors.
- </p>
- <p>The <code class="code">allyuv</code> source returns frames of size 4096x4096 of all yuv colors.
- </p>
- <p>The <code class="code">color</code> source provides an uniformly colored input.
- </p>
- <p>The <code class="code">colorchart</code> source provides a colors checker chart.
- </p>
- <p>The <code class="code">colorspectrum</code> source provides a color spectrum input.
- </p>
- <p>The <code class="code">haldclutsrc</code> source provides an identity Hald CLUT. See also
- <a class="ref" href="#haldclut">haldclut</a> filter.
- </p>
- <p>The <code class="code">nullsrc</code> source returns unprocessed video frames. It is
- mainly useful to be employed in analysis / debugging tools, or as the
- source for filters which ignore the input data.
- </p>
- <p>The <code class="code">pal75bars</code> source generates a color bars pattern, based on
- EBU PAL recommendations with 75% color levels.
- </p>
- <p>The <code class="code">pal100bars</code> source generates a color bars pattern, based on
- EBU PAL recommendations with 100% color levels.
- </p>
- <p>The <code class="code">rgbtestsrc</code> source generates an RGB test pattern useful for
- detecting RGB vs BGR issues. You should see a red, green and blue
- stripe from top to bottom.
- </p>
- <p>The <code class="code">smptebars</code> source generates a color bars pattern, based on
- the SMPTE Engineering Guideline EG 1-1990.
- </p>
- <p>The <code class="code">smptehdbars</code> source generates a color bars pattern, based on
- the SMPTE RP 219-2002.
- </p>
- <p>The <code class="code">testsrc</code> source generates a test video pattern, showing a
- color pattern, a scrolling gradient and a timestamp. This is mainly
- intended for testing purposes.
- </p>
- <p>The <code class="code">testsrc2</code> source is similar to testsrc, but supports more
- pixel formats instead of just <code class="code">rgb24</code>. This allows using it as an
- input for other tests without requiring a format conversion.
- </p>
- <p>The <code class="code">yuvtestsrc</code> source generates an YUV test pattern. You should
- see a y, cb and cr stripe from top to bottom.
- </p>
- <p>The sources accept the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">level</samp></dt>
- <dd><p>Specify the level of the Hald CLUT, only available in the <code class="code">haldclutsrc</code>
- source. A level of <code class="code">N</code> generates a picture of <code class="code">N*N*N</code> by <code class="code">N*N*N</code>
- pixels to be used as identity matrix for 3D lookup tables. Each component is
- coded on a <code class="code">1/(N*N)</code> scale.
- </p>
- </dd>
- <dt><samp class="option">color, c</samp></dt>
- <dd><p>Specify the color of the source, only available in the <code class="code">color</code>
- source. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#color-syntax">"Color" section in the ffmpeg-utils manual</a>.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the size of the sourced video. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- The default value is <code class="code">320x240</code>.
- </p>
- <p>This option is not available with the <code class="code">allrgb</code>, <code class="code">allyuv</code>, and
- <code class="code">haldclutsrc</code> filters.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Specify the frame rate of the sourced video, as the number of frames
- generated per second. It has to be a string in the format
- <var class="var">frame_rate_num</var>/<var class="var">frame_rate_den</var>, an integer number, a floating point
- number or a valid video frame rate abbreviation. The default value is
- "25".
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the duration of the sourced video. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>If not specified, or the expressed duration is negative, the video is
- supposed to be generated forever.
- </p>
- <p>Since the frame rate is used as time base, all frames including the last one
- will have their full duration. If the specified duration is not a multiple
- of the frame duration, it will be rounded up.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>Set the sample aspect ratio of the sourced video.
- </p>
- </dd>
- <dt><samp class="option">alpha</samp></dt>
- <dd><p>Specify the alpha (opacity) of the background, only available in the
- <code class="code">testsrc2</code> source. The value must be between 0 (fully transparent) and
- 255 (fully opaque, the default).
- </p>
- </dd>
- <dt><samp class="option">decimals, n</samp></dt>
- <dd><p>Set the number of decimals to show in the timestamp, only available in the
- <code class="code">testsrc</code> source.
- </p>
- <p>The displayed timestamp value will correspond to the original
- timestamp value multiplied by the power of 10 of the specified
- value. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set the type of the color spectrum, only available in the
- <code class="code">colorspectrum</code> source. Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">black</samp>’</dt>
- <dt>‘<samp class="samp">white</samp>’</dt>
- <dt>‘<samp class="samp">all</samp>’</dt>
- </dl>
- </dd>
- <dt><samp class="option">patch_size</samp></dt>
- <dd><p>Set patch size of single color patch, only available in the
- <code class="code">colorchart</code> source. Default is <code class="code">64x64</code>.
- </p>
- </dd>
- <dt><samp class="option">preset</samp></dt>
- <dd><p>Set colorchecker colors preset, only available in the
- <code class="code">colorchart</code> source.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">reference</samp>’</dt>
- <dt>‘<samp class="samp">skintones</samp>’</dt>
- </dl>
- <p>Default value is <code class="code">reference</code>.
- </p></dd>
- </dl>
- <a name="Examples-208"></a>
- <h4 class="subsection">46.13.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-208" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-208" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate a video with a duration of 5.3 seconds, with size
- 176x144 and a frame rate of 10 frames per second:
- <div class="example">
- <pre class="example-preformatted">testsrc=duration=5.3:size=qcif:rate=10
- </pre></div>
- </li><li>The following graph description will generate a red source
- with an opacity of 0.2, with size "qcif" and a frame rate of 10
- frames per second:
- <div class="example">
- <pre class="example-preformatted">color=c=red@0.2:s=qcif:r=10
- </pre></div>
- </li><li>If the input content is to be ignored, <code class="code">nullsrc</code> can be used. The
- following command generates noise in the luma plane by employing
- the <code class="code">geq</code> filter:
- <div class="example">
- <pre class="example-preformatted">nullsrc=s=256x256, geq=random(1)*255:128:128
- </pre></div>
- </li></ul>
- <a name="Commands-157"></a>
- <h4 class="subsection">46.13.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-157" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-157" aria-hidden="true">TOC</a></span></h4>
- <p>The <code class="code">color</code> source supports the following commands:
- </p>
- <dl class="table">
- <dt><samp class="option">c, color</samp></dt>
- <dd><p>Set the color of the created image. Accepts the same syntax of the
- corresponding <samp class="option">color</samp> option.
- </p></dd>
- </dl>
- <a name="openclsrc"></a>
- <h3 class="section">46.14 openclsrc<span class="pull-right"><a class="anchor hidden-xs" href="#openclsrc" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-openclsrc" aria-hidden="true">TOC</a></span></h3>
- <p>Generate video using an OpenCL program.
- </p>
- <dl class="table">
- <dt><samp class="option">source</samp></dt>
- <dd><p>OpenCL program source file.
- </p>
- </dd>
- <dt><samp class="option">kernel</samp></dt>
- <dd><p>Kernel name in program.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Size of frames to generate. This must be set.
- </p>
- </dd>
- <dt><samp class="option">format</samp></dt>
- <dd><p>Pixel format to use for the generated frames. This must be set.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Number of frames generated every second. Default value is ’25’.
- </p>
- </dd>
- </dl>
- <p>For details of how the program loading works, see the <a class="ref" href="#program_005fopencl">program_opencl</a>
- filter.
- </p>
- <p>Example programs:
- </p>
- <ul class="itemize mark-bullet">
- <li>Generate a colour ramp by setting pixel values from the position of the pixel
- in the output image. (Note that this will work with all pixel formats, but
- the generated output will not be the same.)
- <pre class="verbatim">__kernel void ramp(__write_only image2d_t dst,
- unsigned int index)
- {
- int2 loc = (int2)(get_global_id(0), get_global_id(1));
- float4 val;
- val.xy = val.zw = convert_float2(loc) / convert_float2(get_image_dim(dst));
- write_imagef(dst, loc, val);
- }
- </pre>
- </li><li>Generate a Sierpinski carpet pattern, panning by a single pixel each frame.
- <pre class="verbatim">__kernel void sierpinski_carpet(__write_only image2d_t dst,
- unsigned int index)
- {
- int2 loc = (int2)(get_global_id(0), get_global_id(1));
- float4 value = 0.0f;
- int x = loc.x + index;
- int y = loc.y + index;
- while (x > 0 || y > 0) {
- if (x % 3 == 1 && y % 3 == 1) {
- value = 1.0f;
- break;
- }
- x /= 3;
- y /= 3;
- }
- write_imagef(dst, loc, value);
- }
- </pre>
- </li></ul>
- <a name="sierpinski"></a>
- <h3 class="section">46.15 sierpinski<span class="pull-right"><a class="anchor hidden-xs" href="#sierpinski" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sierpinski" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a Sierpinski carpet/triangle fractal, and randomly pan around.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set frame size. For the syntax of this option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video
- size" section in the ffmpeg-utils manual</a>. Default value is "640x480".
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">seed</samp></dt>
- <dd><p>Set seed which is used for random panning.
- </p>
- </dd>
- <dt><samp class="option">jump</samp></dt>
- <dd><p>Set max jump for single pan destination. Allowed range is from 1 to 10000.
- </p>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set fractal type, can be default <code class="code">carpet</code> or <code class="code">triangle</code>.
- </p></dd>
- </dl>
- <a name="zoneplate"></a>
- <h3 class="section">46.16 zoneplate<span class="pull-right"><a class="anchor hidden-xs" href="#zoneplate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-zoneplate" aria-hidden="true">TOC</a></span></h3>
- <p>Generate a zoneplate test video pattern.
- </p>
- <p>This source accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set frame size. For the syntax of this option, check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video
- size" section in the ffmpeg-utils manual</a>. Default value is "320x240".
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set the duration of the sourced video. See
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>
- for the accepted syntax.
- </p>
- <p>If not specified, or the expressed duration is negative, the video is
- supposed to be generated forever.
- </p>
- </dd>
- <dt><samp class="option">sar</samp></dt>
- <dd><p>Set the sample aspect ratio of the sourced video.
- </p>
- </dd>
- <dt><samp class="option">precision</samp></dt>
- <dd><p>Set precision in bits for look-up table for sine calculations. Default value is 10.
- Allowed range is from 4 to 16.
- </p>
- </dd>
- <dt><samp class="option">xo</samp></dt>
- <dd><p>Set horizontal axis offset for output signal. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">yo</samp></dt>
- <dd><p>Set vertical axis offset for output signal. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">to</samp></dt>
- <dd><p>Set time axis offset for output signal. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">k0</samp></dt>
- <dd><p>Set 0-order, constant added to signal phase. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">kx</samp></dt>
- <dd><p>Set 1-order, phase factor multiplier for horizontal axis. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">ky</samp></dt>
- <dd><p>Set 1-order, phase factor multiplier for vertical axis. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">kt</samp></dt>
- <dd><p>Set 1-order, phase factor multiplier for time axis. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">kxt, kyt, kxy</samp></dt>
- <dd><p>Set phase factor multipliers for combination of spatial and temporal axis.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">kx2</samp></dt>
- <dd><p>Set 2-order, phase factor multiplier for horizontal axis. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">ky2</samp></dt>
- <dd><p>Set 2-order, phase factor multiplier for vertical axis. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">kt2</samp></dt>
- <dd><p>Set 2-order, phase factor multiplier for time axis. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">ku</samp></dt>
- <dd><p>Set the constant added to final phase to produce chroma-blue component of signal.
- Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">kv</samp></dt>
- <dd><p>Set the constant added to final phase to produce chroma-red component of signal.
- Default value is 0.
- </p></dd>
- </dl>
- <a name="Commands-158"></a>
- <h4 class="subsection">46.16.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-158" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-158" aria-hidden="true">TOC</a></span></h4>
- <p>This source supports the some above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="Examples-209"></a>
- <h4 class="subsection">46.16.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-209" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-209" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Generate horizontal color sine sweep:
- <div class="example">
- <pre class="example-preformatted">zoneplate=ku=512:kv=0:kt2=0:kx2=256:s=wvga:xo=-426:kt=11
- </pre></div>
- </li><li>Generate vertical color sine sweep:
- <div class="example">
- <pre class="example-preformatted">zoneplate=ku=512:kv=0:kt2=0:ky2=156:s=wvga:yo=-240:kt=11
- </pre></div>
- </li><li>Generate circular zone-plate:
- <div class="example">
- <pre class="example-preformatted">zoneplate=ku=512:kv=100:kt2=0:ky2=256:kx2=556:s=wvga:yo=0:kt=11
- </pre></div>
- </li></ul>
- <a name="Video-Sinks"></a>
- <h2 class="chapter">47 Video Sinks<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Sinks" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Sinks" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available video sinks.
- </p>
- <a name="buffersink"></a>
- <h3 class="section">47.1 buffersink<span class="pull-right"><a class="anchor hidden-xs" href="#buffersink" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-buffersink" aria-hidden="true">TOC</a></span></h3>
- <p>Buffer video frames, and make them available to the end of the filter
- graph.
- </p>
- <p>This sink is mainly intended for programmatic use, in particular
- through the interface defined in <samp class="file">libavfilter/buffersink.h</samp>
- or the options system.
- </p>
- <p>It accepts a pointer to an AVBufferSinkContext structure, which
- defines the incoming buffers’ formats, to be passed as the opaque
- parameter to <code class="code">avfilter_init_filter</code> for initialization.
- </p>
- <a name="nullsink"></a>
- <h3 class="section">47.2 nullsink<span class="pull-right"><a class="anchor hidden-xs" href="#nullsink" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-nullsink" aria-hidden="true">TOC</a></span></h3>
- <p>Null video sink: do absolutely nothing with the input video. It is
- mainly useful as a template and for use in analysis / debugging
- tools.
- </p>
- <a name="Multimedia-Filters"></a>
- <h2 class="chapter">48 Multimedia Filters<span class="pull-right"><a class="anchor hidden-xs" href="#Multimedia-Filters" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Multimedia-Filters" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available multimedia filters.
- </p>
- <a name="a3dscope"></a>
- <h3 class="section">48.1 a3dscope<span class="pull-right"><a class="anchor hidden-xs" href="#a3dscope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-a3dscope" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to 3d scope video output.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">hd720</code>.
- </p>
- </dd>
- <dt><samp class="option">fov</samp></dt>
- <dd><p>Set the camera field of view. Default is 90 degrees.
- Allowed range is from 40 to 150.
- </p>
- </dd>
- <dt><samp class="option">roll</samp></dt>
- <dd><p>Set the camera roll.
- </p>
- </dd>
- <dt><samp class="option">pitch</samp></dt>
- <dd><p>Set the camera pitch.
- </p>
- </dd>
- <dt><samp class="option">yaw</samp></dt>
- <dd><p>Set the camera yaw.
- </p>
- </dd>
- <dt><samp class="option">xzoom</samp></dt>
- <dd><p>Set the camera zoom on X-axis.
- </p>
- </dd>
- <dt><samp class="option">yzoom</samp></dt>
- <dd><p>Set the camera zoom on Y-axis.
- </p>
- </dd>
- <dt><samp class="option">zzoom</samp></dt>
- <dd><p>Set the camera zoom on Z-axis.
- </p>
- </dd>
- <dt><samp class="option">xpos</samp></dt>
- <dd><p>Set the camera position on X-axis.
- </p>
- </dd>
- <dt><samp class="option">ypos</samp></dt>
- <dd><p>Set the camera position on Y-axis.
- </p>
- </dd>
- <dt><samp class="option">zpos</samp></dt>
- <dd><p>Set the camera position on Z-axis.
- </p>
- </dd>
- <dt><samp class="option">length</samp></dt>
- <dd><p>Set the length of displayed audio waves in number of frames.
- </p></dd>
- </dl>
- <a name="Commands-159"></a>
- <h4 class="subsection">48.1.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-159" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-159" aria-hidden="true">TOC</a></span></h4>
- <p>Filter supports the some above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="abitscope"></a>
- <h3 class="section">48.2 abitscope<span class="pull-right"><a class="anchor hidden-xs" href="#abitscope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-abitscope" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a video output, displaying the audio bit scope.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">1024x256</code>.
- </p>
- </dd>
- <dt><samp class="option">colors</samp></dt>
- <dd><p>Specify list of colors separated by space or by ’|’ which will be used to
- draw channels. Unrecognized or missing colors will be replaced
- by white color.
- </p>
- </dd>
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set output mode. Can be <code class="code">bars</code> or <code class="code">trace</code>. Default is <code class="code">bars</code>.
- </p></dd>
- </dl>
- <a name="adrawgraph"></a>
- <h3 class="section">48.3 adrawgraph<span class="pull-right"><a class="anchor hidden-xs" href="#adrawgraph" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-adrawgraph" aria-hidden="true">TOC</a></span></h3>
- <p>Draw a graph using input audio metadata.
- </p>
- <p>See <a class="ref" href="#drawgraph">drawgraph</a>
- </p>
- <a name="agraphmonitor"></a>
- <h3 class="section">48.4 agraphmonitor<span class="pull-right"><a class="anchor hidden-xs" href="#agraphmonitor" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-agraphmonitor" aria-hidden="true">TOC</a></span></h3>
- <p>See <a class="ref" href="#graphmonitor">graphmonitor</a>.
- </p>
- <a name="ahistogram"></a>
- <h3 class="section">48.5 ahistogram<span class="pull-right"><a class="anchor hidden-xs" href="#ahistogram" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ahistogram" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a video output, displaying the volume histogram.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">dmode</samp></dt>
- <dd><p>Specify how histogram is calculated.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">single</samp>’</dt>
- <dd><p>Use single histogram for all channels.
- </p></dd>
- <dt>‘<samp class="samp">separate</samp>’</dt>
- <dd><p>Use separate histogram for each channel.
- </p></dd>
- </dl>
- <p>Default is <code class="code">single</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set frame rate, expressed as number of frames per second. Default
- value is "25".
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">hd720</code>.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set display scale.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>logarithmic
- </p></dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>square root
- </p></dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>cubic root
- </p></dd>
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>linear
- </p></dd>
- <dt>‘<samp class="samp">rlog</samp>’</dt>
- <dd><p>reverse logarithmic
- </p></dd>
- </dl>
- <p>Default is <code class="code">log</code>.
- </p>
- </dd>
- <dt><samp class="option">ascale</samp></dt>
- <dd><p>Set amplitude scale.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>logarithmic
- </p></dd>
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>linear
- </p></dd>
- </dl>
- <p>Default is <code class="code">log</code>.
- </p>
- </dd>
- <dt><samp class="option">acount</samp></dt>
- <dd><p>Set how much frames to accumulate in histogram.
- Default is 1. Setting this to -1 accumulates all frames.
- </p>
- </dd>
- <dt><samp class="option">rheight</samp></dt>
- <dd><p>Set histogram ratio of window height.
- </p>
- </dd>
- <dt><samp class="option">slide</samp></dt>
- <dd><p>Set sonogram sliding.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">replace</samp>’</dt>
- <dd><p>replace old rows with new ones.
- </p></dd>
- <dt>‘<samp class="samp">scroll</samp>’</dt>
- <dd><p>scroll from top to bottom.
- </p></dd>
- </dl>
- <p>Default is <code class="code">replace</code>.
- </p>
- </dd>
- <dt><samp class="option">hmode</samp></dt>
- <dd><p>Set histogram mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">abs</samp>’</dt>
- <dd><p>Use absolute values of samples.
- </p></dd>
- <dt>‘<samp class="samp">sign</samp>’</dt>
- <dd><p>Use untouched values of samples.
- </p></dd>
- </dl>
- <p>Default is <code class="code">abs</code>.
- </p></dd>
- </dl>
- <a name="aphasemeter"></a>
- <h3 class="section">48.6 aphasemeter<span class="pull-right"><a class="anchor hidden-xs" href="#aphasemeter" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-aphasemeter" aria-hidden="true">TOC</a></span></h3>
- <p>Measures phase of input audio, which is exported as metadata <code class="code">lavfi.aphasemeter.phase</code>,
- representing mean phase of current audio frame. A video output can also be produced and is
- enabled by default. The audio is passed through as first output.
- </p>
- <p>Audio will be rematrixed to stereo if it has a different channel layout. Phase value is in
- range <code class="code">[-1, 1]</code> where <code class="code">-1</code> means left and right channels are completely out of phase
- and <code class="code">1</code> means channels are in phase.
- </p>
- <p>The filter accepts the following options, all related to its video output:
- </p>
- <dl class="table">
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the output frame rate. Default value is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">800x400</code>.
- </p>
- </dd>
- <dt><samp class="option">rc</samp></dt>
- <dt><samp class="option">gc</samp></dt>
- <dt><samp class="option">bc</samp></dt>
- <dd><p>Specify the red, green, blue contrast. Default values are <code class="code">2</code>,
- <code class="code">7</code> and <code class="code">1</code>.
- Allowed range is <code class="code">[0, 255]</code>.
- </p>
- </dd>
- <dt><samp class="option">mpc</samp></dt>
- <dd><p>Set color which will be used for drawing median phase. If color is
- <code class="code">none</code> which is default, no median phase value will be drawn.
- </p>
- </dd>
- <dt><samp class="option">video</samp></dt>
- <dd><p>Enable video output. Default is enabled.
- </p></dd>
- </dl>
- <a name="phasing-detection"></a>
- <h4 class="subsection">48.6.1 phasing detection<span class="pull-right"><a class="anchor hidden-xs" href="#phasing-detection" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-phasing-detection" aria-hidden="true">TOC</a></span></h4>
- <p>The filter also detects out of phase and mono sequences in stereo streams.
- It logs the sequence start, end and duration when it lasts longer or as long as the minimum set.
- </p>
- <p>The filter accepts the following options for this detection:
- </p>
- <dl class="table">
- <dt><samp class="option">phasing</samp></dt>
- <dd><p>Enable mono and out of phase detection. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">tolerance, t</samp></dt>
- <dd><p>Set phase tolerance for mono detection, in amplitude ratio. Default is <code class="code">0</code>.
- Allowed range is <code class="code">[0, 1]</code>.
- </p>
- </dd>
- <dt><samp class="option">angle, a</samp></dt>
- <dd><p>Set angle threshold for out of phase detection, in degree. Default is <code class="code">170</code>.
- Allowed range is <code class="code">[90, 180]</code>.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set mono or out of phase duration until notification, expressed in seconds. Default is <code class="code">2</code>.
- </p></dd>
- </dl>
- <a name="Examples-210"></a>
- <h4 class="subsection">48.6.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-210" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-210" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Complete example with <code class="command">ffmpeg</code> to detect 1 second of mono with 0.001 phase tolerance:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i stereo.wav -af aphasemeter=video=0:phasing=1:duration=1:tolerance=0.001 -f null -
- </pre></div>
- </li></ul>
- <a name="avectorscope"></a>
- <h3 class="section">48.7 avectorscope<span class="pull-right"><a class="anchor hidden-xs" href="#avectorscope" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avectorscope" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a video output, representing the audio vector
- scope.
- </p>
- <p>The filter is used to measure the difference between channels of stereo
- audio stream. A monaural signal, consisting of identical left and right
- signal, results in straight vertical line. Any stereo separation is visible
- as a deviation from this line, creating a Lissajous figure.
- If the straight (or deviation from it) but horizontal line appears this
- indicates that the left and right channels are out of phase.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode, m</samp></dt>
- <dd><p>Set the vectorscope mode.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">lissajous</samp>’</dt>
- <dd><p>Lissajous rotated by 45 degrees.
- </p>
- </dd>
- <dt>‘<samp class="samp">lissajous_xy</samp>’</dt>
- <dd><p>Same as above but not rotated.
- </p>
- </dd>
- <dt>‘<samp class="samp">polar</samp>’</dt>
- <dd><p>Shape resembling half of circle.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">lissajous</samp>’.
- </p>
- </dd>
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">400x400</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the output frame rate. Default value is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">rc</samp></dt>
- <dt><samp class="option">gc</samp></dt>
- <dt><samp class="option">bc</samp></dt>
- <dt><samp class="option">ac</samp></dt>
- <dd><p>Specify the red, green, blue and alpha contrast. Default values are <code class="code">40</code>,
- <code class="code">160</code>, <code class="code">80</code> and <code class="code">255</code>.
- Allowed range is <code class="code">[0, 255]</code>.
- </p>
- </dd>
- <dt><samp class="option">rf</samp></dt>
- <dt><samp class="option">gf</samp></dt>
- <dt><samp class="option">bf</samp></dt>
- <dt><samp class="option">af</samp></dt>
- <dd><p>Specify the red, green, blue and alpha fade. Default values are <code class="code">15</code>,
- <code class="code">10</code>, <code class="code">5</code> and <code class="code">5</code>.
- Allowed range is <code class="code">[0, 255]</code>.
- </p>
- </dd>
- <dt><samp class="option">zoom</samp></dt>
- <dd><p>Set the zoom factor. Default value is <code class="code">1</code>. Allowed range is <code class="code">[0, 10]</code>.
- Values lower than <var class="var">1</var> will auto adjust zoom factor to maximal possible value.
- </p>
- </dd>
- <dt><samp class="option">draw</samp></dt>
- <dd><p>Set the vectorscope drawing mode.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">dot</samp>’</dt>
- <dd><p>Draw dot for each sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">line</samp>’</dt>
- <dd><p>Draw line between previous and current sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">aaline</samp>’</dt>
- <dd><p>Draw anti-aliased line between previous and current sample.
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">dot</samp>’.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Specify amplitude scale of audio samples.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>Linear.
- </p>
- </dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>Square root.
- </p>
- </dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>Cubic root.
- </p>
- </dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>Logarithmic.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">swap</samp></dt>
- <dd><p>Swap left channel axis with right channel axis.
- </p>
- </dd>
- <dt><samp class="option">mirror</samp></dt>
- <dd><p>Mirror axis.
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>No mirror.
- </p>
- </dd>
- <dt>‘<samp class="samp">x</samp>’</dt>
- <dd><p>Mirror only x axis.
- </p>
- </dd>
- <dt>‘<samp class="samp">y</samp>’</dt>
- <dd><p>Mirror only y axis.
- </p>
- </dd>
- <dt>‘<samp class="samp">xy</samp>’</dt>
- <dd><p>Mirror both axis.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-211"></a>
- <h4 class="subsection">48.7.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-211" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-211" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Complete example using <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
- [a] avectorscope=zoom=1.3:rc=2:gc=200:bc=10:rf=1:gf=8:bf=7 [out0]'
- </pre></div>
- </li></ul>
- <a name="Commands-160"></a>
- <h4 class="subsection">48.7.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-160" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-160" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the all above options as commands except options <code class="code">size</code> and <code class="code">rate</code>.
- </p>
- <a name="bench_002c-abench"></a>
- <h3 class="section">48.8 bench, abench<span class="pull-right"><a class="anchor hidden-xs" href="#bench_002c-abench" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bench_002c-abench" aria-hidden="true">TOC</a></span></h3>
- <p>Benchmark part of a filtergraph.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">action</samp></dt>
- <dd><p>Start or stop a timer.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">start</samp>’</dt>
- <dd><p>Get the current time, set it as frame metadata (using the key
- <code class="code">lavfi.bench.start_time</code>), and forward the frame to the next filter.
- </p>
- </dd>
- <dt>‘<samp class="samp">stop</samp>’</dt>
- <dd><p>Get the current time and fetch the <code class="code">lavfi.bench.start_time</code> metadata from
- the input frame metadata to get the time difference. Time difference, average,
- maximum and minimum time (respectively <code class="code">t</code>, <code class="code">avg</code>, <code class="code">max</code> and
- <code class="code">min</code>) are then printed. The timestamps are expressed in seconds.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-212"></a>
- <h4 class="subsection">48.8.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-212" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-212" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Benchmark <a class="ref" href="#selectivecolor">selectivecolor</a> filter:
- <div class="example">
- <pre class="example-preformatted">bench=start,selectivecolor=reds=-.2 .12 -.49,bench=stop
- </pre></div>
- </li></ul>
- <a class="anchor" id="concat-filter"></a><a name="concat-3"></a>
- <h3 class="section">48.9 concat<span class="pull-right"><a class="anchor hidden-xs" href="#concat-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-concat-3" aria-hidden="true">TOC</a></span></h3>
- <p>Concatenate audio and video streams, joining them together one after the
- other.
- </p>
- <p>The filter works on segments of synchronized video and audio streams. All
- segments must have the same number of streams of each type, and that will
- also be the number of streams at output.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the number of segments. Default is 2.
- </p>
- </dd>
- <dt><samp class="option">v</samp></dt>
- <dd><p>Set the number of output video streams, that is also the number of video
- streams in each segment. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">a</samp></dt>
- <dd><p>Set the number of output audio streams, that is also the number of audio
- streams in each segment. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">unsafe</samp></dt>
- <dd><p>Activate unsafe mode: do not fail if segments have a different format.
- </p>
- </dd>
- </dl>
- <p>The filter has <var class="var">v</var>+<var class="var">a</var> outputs: first <var class="var">v</var> video outputs, then
- <var class="var">a</var> audio outputs.
- </p>
- <p>There are <var class="var">n</var>x(<var class="var">v</var>+<var class="var">a</var>) inputs: first the inputs for the first
- segment, in the same order as the outputs, then the inputs for the second
- segment, etc.
- </p>
- <p>Related streams do not always have exactly the same duration, for various
- reasons including codec frame size or sloppy authoring. For that reason,
- related synchronized streams (e.g. a video and its audio track) should be
- concatenated at once. The concat filter will use the duration of the longest
- stream in each segment (except the last one), and if necessary pad shorter
- audio streams with silence.
- </p>
- <p>For this filter to work correctly, all segments must start at timestamp 0.
- </p>
- <p>All corresponding streams must have the same parameters in all segments; the
- filtering system will automatically select a common pixel format for video
- streams, and a common sample format, sample rate and channel layout for
- audio streams, but other settings, such as resolution, must be converted
- explicitly by the user.
- </p>
- <p>Different frame rates are acceptable but will result in variable frame rate
- at output; be sure to configure the output file to handle it.
- </p>
- <a name="Examples-213"></a>
- <h4 class="subsection">48.9.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-213" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-213" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Concatenate an opening, an episode and an ending, all in bilingual version
- (video in stream 0, audio in streams 1 and 2):
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv -filter_complex \
- '[0:0] [0:1] [0:2] [1:0] [1:1] [1:2] [2:0] [2:1] [2:2]
- concat=n=3:v=1:a=2 [v] [a1] [a2]' \
- -map '[v]' -map '[a1]' -map '[a2]' output.mkv
- </pre></div>
- </li><li>Concatenate two parts, handling audio and video separately, using the
- (a)movie sources, and adjusting the resolution:
- <div class="example">
- <pre class="example-preformatted">movie=part1.mp4, scale=512:288 [v1] ; amovie=part1.mp4 [a1] ;
- movie=part2.mp4, scale=512:288 [v2] ; amovie=part2.mp4 [a2] ;
- [v1] [v2] concat [outv] ; [a1] [a2] concat=v=0:a=1 [outa]
- </pre></div>
- <p>Note that a desync will happen at the stitch if the audio and video streams
- do not have exactly the same duration in the first file.
- </p>
- </li></ul>
- <a name="Commands-161"></a>
- <h4 class="subsection">48.9.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-161" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-161" aria-hidden="true">TOC</a></span></h4>
- <p>This filter supports the following commands:
- </p><dl class="table">
- <dt><samp class="option">next</samp></dt>
- <dd><p>Close the current segment and step to the next one
- </p></dd>
- </dl>
- <a class="anchor" id="ebur128"></a><a name="ebur128-1"></a>
- <h3 class="section">48.10 ebur128<span class="pull-right"><a class="anchor hidden-xs" href="#ebur128-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ebur128-1" aria-hidden="true">TOC</a></span></h3>
- <p>EBU R128 scanner filter. This filter takes an audio stream and analyzes its loudness
- level. By default, it logs a message at a frequency of 10Hz with the
- Momentary loudness (identified by <code class="code">M</code>), Short-term loudness (<code class="code">S</code>),
- Integrated loudness (<code class="code">I</code>) and Loudness Range (<code class="code">LRA</code>).
- </p>
- <p>The filter can only analyze streams which have
- sample format is double-precision floating point. The input stream will be converted to
- this specification, if needed. Users may need to insert aformat and/or aresample filters
- after this filter to obtain the original parameters.
- </p>
- <p>The filter also has a video output (see the <var class="var">video</var> option) with a real
- time graph to observe the loudness evolution. The graphic contains the logged
- message mentioned above, so it is not printed anymore when this option is set,
- unless the verbose logging is set. The main graphing area contains the
- short-term loudness (3 seconds of analysis), and the gauge on the right is for
- the momentary loudness (400 milliseconds), but can optionally be configured
- to instead display short-term loudness (see <var class="var">gauge</var>).
- </p>
- <p>The green area marks a +/- 1LU target range around the target loudness
- (-23LUFS by default, unless modified through <var class="var">target</var>).
- </p>
- <p>More information about the Loudness Recommendation EBU R128 on
- <a class="url" href="http://tech.ebu.ch/loudness">http://tech.ebu.ch/loudness</a>.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">video</samp></dt>
- <dd><p>Activate the video output. The audio stream is passed unchanged whether this
- option is set or no. The video stream will be the first output stream if
- activated. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">size</samp></dt>
- <dd><p>Set the video size. This option is for video only. For the syntax of this
- option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default and minimum resolution is <code class="code">640x480</code>.
- </p>
- </dd>
- <dt><samp class="option">meter</samp></dt>
- <dd><p>Set the EBU scale meter. Default is <code class="code">9</code>. Common values are <code class="code">9</code> and
- <code class="code">18</code>, respectively for EBU scale meter +9 and EBU scale meter +18. Any
- other integer value between this range is allowed.
- </p>
- </dd>
- <dt><samp class="option">metadata</samp></dt>
- <dd><p>Set metadata injection. If set to <code class="code">1</code>, the audio input will be segmented
- into 100ms output frames, each of them containing various loudness information
- in metadata. All the metadata keys are prefixed with <code class="code">lavfi.r128.</code>.
- </p>
- <p>Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">framelog</samp></dt>
- <dd><p>Force the frame logging level.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">quiet</samp>’</dt>
- <dd><p>logging disabled
- </p></dd>
- <dt>‘<samp class="samp">info</samp>’</dt>
- <dd><p>information logging level
- </p></dd>
- <dt>‘<samp class="samp">verbose</samp>’</dt>
- <dd><p>verbose logging level
- </p></dd>
- </dl>
- <p>By default, the logging level is set to <var class="var">info</var>. If the <samp class="option">video</samp> or
- the <samp class="option">metadata</samp> options are set, it switches to <var class="var">verbose</var>.
- </p>
- </dd>
- <dt><samp class="option">peak</samp></dt>
- <dd><p>Set peak mode(s).
- </p>
- <p>Available modes can be cumulated (the option is a <code class="code">flag</code> type). Possible
- values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Disable any peak mode (default).
- </p></dd>
- <dt>‘<samp class="samp">sample</samp>’</dt>
- <dd><p>Enable sample-peak mode.
- </p>
- <p>Simple peak mode looking for the higher sample value. It logs a message
- for sample-peak (identified by <code class="code">SPK</code>).
- </p></dd>
- <dt>‘<samp class="samp">true</samp>’</dt>
- <dd><p>Enable true-peak mode.
- </p>
- <p>If enabled, the peak lookup is done on an over-sampled version of the input
- stream for better peak accuracy. It logs a message for true-peak.
- (identified by <code class="code">TPK</code>) and true-peak per frame (identified by <code class="code">FTPK</code>).
- This mode requires a build with <code class="code">libswresample</code>.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">dualmono</samp></dt>
- <dd><p>Treat mono input files as "dual mono". If a mono file is intended for playback
- on a stereo system, its EBU R128 measurement will be perceptually incorrect.
- If set to <code class="code">true</code>, this option will compensate for this effect.
- Multi-channel input files are not affected by this option.
- </p>
- </dd>
- <dt><samp class="option">panlaw</samp></dt>
- <dd><p>Set a specific pan law to be used for the measurement of dual mono files.
- This parameter is optional, and has a default value of -3.01dB.
- </p>
- </dd>
- <dt><samp class="option">target</samp></dt>
- <dd><p>Set a specific target level (in LUFS) used as relative zero in the visualization.
- This parameter is optional and has a default value of -23LUFS as specified
- by EBU R128. However, material published online may prefer a level of -16LUFS
- (e.g. for use with podcasts or video platforms).
- </p>
- </dd>
- <dt><samp class="option">gauge</samp></dt>
- <dd><p>Set the value displayed by the gauge. Valid values are <code class="code">momentary</code> and s
- <code class="code">shortterm</code>. By default the momentary value will be used, but in certain
- scenarios it may be more useful to observe the short term value instead (e.g.
- live mixing).
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Sets the display scale for the loudness. Valid parameters are <code class="code">absolute</code>
- (in LUFS) or <code class="code">relative</code> (LU) relative to the target. This only affects the
- video output, not the summary or continuous log output.
- </p>
- </dd>
- <dt><samp class="option">integrated</samp></dt>
- <dd><p>Read-only exported value for measured integrated loudness, in LUFS.
- </p>
- </dd>
- <dt><samp class="option">range</samp></dt>
- <dd><p>Read-only exported value for measured loudness range, in LU.
- </p>
- </dd>
- <dt><samp class="option">lra_low</samp></dt>
- <dd><p>Read-only exported value for measured LRA low, in LUFS.
- </p>
- </dd>
- <dt><samp class="option">lra_high</samp></dt>
- <dd><p>Read-only exported value for measured LRA high, in LUFS.
- </p>
- </dd>
- <dt><samp class="option">sample_peak</samp></dt>
- <dd><p>Read-only exported value for measured sample peak, in dBFS.
- </p>
- </dd>
- <dt><samp class="option">true_peak</samp></dt>
- <dd><p>Read-only exported value for measured true peak, in dBFS.
- </p></dd>
- </dl>
- <a name="Examples-214"></a>
- <h4 class="subsection">48.10.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-214" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-214" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Real-time graph using <code class="command">ffplay</code>, with a EBU scale meter +18:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi -i "amovie=input.mp3,ebur128=video=1:meter=18 [out0][out1]"
- </pre></div>
- </li><li>Run an analysis with <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -nostats -i input.mp3 -filter_complex ebur128 -f null -
- </pre></div>
- </li></ul>
- <a name="interleave_002c-ainterleave"></a>
- <h3 class="section">48.11 interleave, ainterleave<span class="pull-right"><a class="anchor hidden-xs" href="#interleave_002c-ainterleave" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-interleave_002c-ainterleave" aria-hidden="true">TOC</a></span></h3>
- <p>Temporally interleave frames from several inputs.
- </p>
- <p><code class="code">interleave</code> works with video inputs, <code class="code">ainterleave</code> with audio.
- </p>
- <p>These filters read frames from several inputs and send the oldest
- queued frame to the output.
- </p>
- <p>Input streams must have well defined, monotonically increasing frame
- timestamp values.
- </p>
- <p>In order to submit one frame to output, these filters need to enqueue
- at least one frame for each input, so they cannot work in case one
- input is not yet terminated and will not receive incoming frames.
- </p>
- <p>For example consider the case when one input is a <code class="code">select</code> filter
- which always drops input frames. The <code class="code">interleave</code> filter will keep
- reading from that input, but it will never be able to send new frames
- to output until the input sends an end-of-stream signal.
- </p>
- <p>Also, depending on inputs synchronization, the filters will drop
- frames in case one input receives more frames than the other ones, and
- the queue is already filled.
- </p>
- <p>These filters accept the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">nb_inputs, n</samp></dt>
- <dd><p>Set the number of different inputs, it is 2 by default.
- </p>
- </dd>
- <dt><samp class="option">duration</samp></dt>
- <dd><p>How to determine the end-of-stream.
- </p>
- <dl class="table">
- <dt><samp class="option">longest</samp></dt>
- <dd><p>The duration of the longest input. (default)
- </p>
- </dd>
- <dt><samp class="option">shortest</samp></dt>
- <dd><p>The duration of the shortest input.
- </p>
- </dd>
- <dt><samp class="option">first</samp></dt>
- <dd><p>The duration of the first input.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="Examples-215"></a>
- <h4 class="subsection">48.11.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-215" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-215" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Interleave frames belonging to different streams using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i bambi.avi -i pr0n.mkv -filter_complex "[0:v][1:v] interleave" out.avi
- </pre></div>
- </li><li>Add flickering blur effect:
- <div class="example">
- <pre class="example-preformatted">select='if(gt(random(0), 0.2), 1, 2)':n=2 [tmp], boxblur=2:2, [tmp] interleave
- </pre></div>
- </li></ul>
- <a name="latency_002c-alatency"></a>
- <h3 class="section">48.12 latency, alatency<span class="pull-right"><a class="anchor hidden-xs" href="#latency_002c-alatency" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-latency_002c-alatency" aria-hidden="true">TOC</a></span></h3>
- <p>Measure filtering latency.
- </p>
- <p>Report previous filter filtering latency, delay in number of audio samples for audio filters
- or number of video frames for video filters.
- </p>
- <p>On end of input stream, filter will report min and max measured latency for previous running filter
- in filtergraph.
- </p>
- <a name="metadata_002c-ametadata"></a>
- <h3 class="section">48.13 metadata, ametadata<span class="pull-right"><a class="anchor hidden-xs" href="#metadata_002c-ametadata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-metadata_002c-ametadata" aria-hidden="true">TOC</a></span></h3>
- <p>Manipulate frame metadata.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set mode of operation of the filter.
- </p>
- <p>Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">select</samp>’</dt>
- <dd><p>If both <code class="code">value</code> and <code class="code">key</code> is set, select frames
- which have such metadata. If only <code class="code">key</code> is set, select
- every frame that has such key in metadata.
- </p>
- </dd>
- <dt>‘<samp class="samp">add</samp>’</dt>
- <dd><p>Add new metadata <code class="code">key</code> and <code class="code">value</code>. If key is already available
- do nothing.
- </p>
- </dd>
- <dt>‘<samp class="samp">modify</samp>’</dt>
- <dd><p>Modify value of already present key.
- </p>
- </dd>
- <dt>‘<samp class="samp">delete</samp>’</dt>
- <dd><p>If <code class="code">value</code> is set, delete only keys that have such value.
- Otherwise, delete key. If <code class="code">key</code> is not set, delete all metadata values in
- the frame.
- </p>
- </dd>
- <dt>‘<samp class="samp">print</samp>’</dt>
- <dd><p>Print key and its value if metadata was found. If <code class="code">key</code> is not set print all
- metadata values available in frame.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">key</samp></dt>
- <dd><p>Set key used with all modes. Must be set for all modes except <code class="code">print</code> and <code class="code">delete</code>.
- </p>
- </dd>
- <dt><samp class="option">value</samp></dt>
- <dd><p>Set metadata value which will be used. This option is mandatory for
- <code class="code">modify</code> and <code class="code">add</code> mode.
- </p>
- </dd>
- <dt><samp class="option">function</samp></dt>
- <dd><p>Which function to use when comparing metadata value and <code class="code">value</code>.
- </p>
- <p>Can be one of following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">same_str</samp>’</dt>
- <dd><p>Values are interpreted as strings, returns true if metadata value is same as <code class="code">value</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">starts_with</samp>’</dt>
- <dd><p>Values are interpreted as strings, returns true if metadata value starts with
- the <code class="code">value</code> option string.
- </p>
- </dd>
- <dt>‘<samp class="samp">less</samp>’</dt>
- <dd><p>Values are interpreted as floats, returns true if metadata value is less than <code class="code">value</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">equal</samp>’</dt>
- <dd><p>Values are interpreted as floats, returns true if <code class="code">value</code> is equal with metadata value.
- </p>
- </dd>
- <dt>‘<samp class="samp">greater</samp>’</dt>
- <dd><p>Values are interpreted as floats, returns true if metadata value is greater than <code class="code">value</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">expr</samp>’</dt>
- <dd><p>Values are interpreted as floats, returns true if expression from option <code class="code">expr</code>
- evaluates to true.
- </p>
- </dd>
- <dt>‘<samp class="samp">ends_with</samp>’</dt>
- <dd><p>Values are interpreted as strings, returns true if metadata value ends with
- the <code class="code">value</code> option string.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">expr</samp></dt>
- <dd><p>Set expression which is used when <code class="code">function</code> is set to <code class="code">expr</code>.
- The expression is evaluated through the eval API and can contain the following
- constants:
- </p>
- <dl class="table">
- <dt><samp class="option">VALUE1, FRAMEVAL</samp></dt>
- <dd><p>Float representation of <code class="code">value</code> from metadata key.
- </p>
- </dd>
- <dt><samp class="option">VALUE2, USERVAL</samp></dt>
- <dd><p>Float representation of <code class="code">value</code> as supplied by user in <code class="code">value</code> option.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">file</samp></dt>
- <dd><p>If specified in <code class="code">print</code> mode, output is written to the named file. Instead of
- plain filename any writable url can be specified. Filename “-” is a shorthand
- for standard output. If <code class="code">file</code> option is not set, output is written to the log
- with AV_LOG_INFO loglevel.
- </p>
- </dd>
- <dt><samp class="option">direct</samp></dt>
- <dd><p>Reduces buffering in print mode when output is written to a URL set using <var class="var">file</var>.
- </p>
- </dd>
- </dl>
- <a name="Examples-216"></a>
- <h4 class="subsection">48.13.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-216" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-216" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Print all metadata values for frames with key <code class="code">lavfi.signalstats.YDIF</code> with values
- between 0 and 1.
- <div class="example">
- <pre class="example-preformatted">signalstats,metadata=print:key=lavfi.signalstats.YDIF:value=0:function=expr:expr='between(VALUE1,0,1)'
- </pre></div>
- </li><li>Print silencedetect output to file <samp class="file">metadata.txt</samp>.
- <div class="example">
- <pre class="example-preformatted">silencedetect,ametadata=mode=print:file=metadata.txt
- </pre></div>
- </li><li>Direct all metadata to a pipe with file descriptor 4.
- <div class="example">
- <pre class="example-preformatted">metadata=mode=print:file='pipe\:4'
- </pre></div>
- </li></ul>
- <a name="perms_002c-aperms"></a>
- <h3 class="section">48.14 perms, aperms<span class="pull-right"><a class="anchor hidden-xs" href="#perms_002c-aperms" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-perms_002c-aperms" aria-hidden="true">TOC</a></span></h3>
- <p>Set read/write permissions for the output frames.
- </p>
- <p>These filters are mainly aimed at developers to test direct path in the
- following filter in the filtergraph.
- </p>
- <p>The filters accept the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Select the permissions mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">none</samp>’</dt>
- <dd><p>Do nothing. This is the default.
- </p></dd>
- <dt>‘<samp class="samp">ro</samp>’</dt>
- <dd><p>Set all the output frames read-only.
- </p></dd>
- <dt>‘<samp class="samp">rw</samp>’</dt>
- <dd><p>Set all the output frames directly writable.
- </p></dd>
- <dt>‘<samp class="samp">toggle</samp>’</dt>
- <dd><p>Make the frame read-only if writable, and writable if read-only.
- </p></dd>
- <dt>‘<samp class="samp">random</samp>’</dt>
- <dd><p>Set each output frame read-only or writable randomly.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">seed</samp></dt>
- <dd><p>Set the seed for the <var class="var">random</var> mode, must be an integer included between
- <code class="code">0</code> and <code class="code">UINT32_MAX</code>. If not specified, or if explicitly set to
- <code class="code">-1</code>, the filter will try to use a good random seed on a best effort
- basis.
- </p></dd>
- </dl>
- <p>Note: in case of auto-inserted filter between the permission filter and the
- following one, the permission might not be received as expected in that
- following filter. Inserting a <a class="ref" href="#format">format</a> or <a class="ref" href="#aformat">aformat</a> filter before the
- perms/aperms filter can avoid this problem.
- </p>
- <a name="realtime_002c-arealtime"></a>
- <h3 class="section">48.15 realtime, arealtime<span class="pull-right"><a class="anchor hidden-xs" href="#realtime_002c-arealtime" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-realtime_002c-arealtime" aria-hidden="true">TOC</a></span></h3>
- <p>Slow down filtering to match real time approximately.
- </p>
- <p>These filters will pause the filtering for a variable amount of time to
- match the output rate with the input timestamps.
- They are similar to the <samp class="option">re</samp> option to <code class="code">ffmpeg</code>.
- </p>
- <p>They accept the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">limit</samp></dt>
- <dd><p>Time limit for the pauses. Any pause longer than that will be considered
- a timestamp discontinuity and reset the timer. Default is 2 seconds.
- </p></dd>
- <dt><samp class="option">speed</samp></dt>
- <dd><p>Speed factor for processing. The value must be a float larger than zero.
- Values larger than 1.0 will result in faster than realtime processing,
- smaller will slow processing down. The <var class="var">limit</var> is automatically adapted
- accordingly. Default is 1.0.
- </p>
- <p>A processing speed faster than what is possible without these filters cannot
- be achieved.
- </p></dd>
- </dl>
- <a name="Commands-162"></a>
- <h4 class="subsection">48.15.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-162" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-162" aria-hidden="true">TOC</a></span></h4>
- <p>Both filters supports the all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="segment_002c-asegment"></a>
- <h3 class="section">48.16 segment, asegment<span class="pull-right"><a class="anchor hidden-xs" href="#segment_002c-asegment" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-segment_002c-asegment" aria-hidden="true">TOC</a></span></h3>
- <p>Split single input stream into multiple streams.
- </p>
- <p>This filter does opposite of concat filters.
- </p>
- <p><code class="code">segment</code> works on video frames, <code class="code">asegment</code> on audio samples.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">timestamps</samp></dt>
- <dd><p>Timestamps of output segments separated by ’|’. The first segment will run
- from the beginning of the input stream. The last segment will run until
- the end of the input stream
- </p>
- </dd>
- <dt><samp class="option">frames, samples</samp></dt>
- <dd><p>Exact frame/sample count to split the segments.
- </p></dd>
- </dl>
- <p>In all cases, prefixing an each segment with ’+’ will make it relative to the
- previous segment.
- </p>
- <a name="Examples-217"></a>
- <h4 class="subsection">48.16.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-217" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-217" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Split input audio stream into three output audio streams, starting at start of input audio stream
- and storing that in 1st output audio stream, then following at 60th second and storing than in 2nd
- output audio stream, and last after 150th second of input audio stream store in 3rd output audio stream:
- <div class="example">
- <pre class="example-preformatted">asegment=timestamps="60|150"
- </pre></div>
- </li></ul>
- <a class="anchor" id="select"></a><a name="select_002c-aselect"></a>
- <h3 class="section">48.17 select, aselect<span class="pull-right"><a class="anchor hidden-xs" href="#select_002c-aselect" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-select_002c-aselect" aria-hidden="true">TOC</a></span></h3>
- <p>Select frames to pass in output.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">expr, e</samp></dt>
- <dd><p>Set expression, which is evaluated for each input frame.
- </p>
- <p>If the expression is evaluated to zero, the frame is discarded.
- </p>
- <p>If the evaluation result is negative or NaN, the frame is sent to the
- first output; otherwise it is sent to the output with index
- <code class="code">ceil(val)-1</code>, assuming that the input index starts from 0.
- </p>
- <p>For example a value of <code class="code">1.2</code> corresponds to the output with index
- <code class="code">ceil(1.2)-1 = 2-1 = 1</code>, that is the second output.
- </p>
- </dd>
- <dt><samp class="option">outputs, n</samp></dt>
- <dd><p>Set the number of outputs. The output to which to send the selected
- frame is based on the result of the evaluation. Default value is 1.
- </p></dd>
- </dl>
- <p>The expression can contain the following constants:
- </p>
- <dl class="table">
- <dt><samp class="option">n</samp></dt>
- <dd><p>The (sequential) number of the filtered frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">selected_n</samp></dt>
- <dd><p>The (sequential) number of the selected frame, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">prev_selected_n</samp></dt>
- <dd><p>The sequential number of the last selected frame. It’s NAN if undefined.
- </p>
- </dd>
- <dt><samp class="option">TB</samp></dt>
- <dd><p>The timebase of the input timestamps.
- </p>
- </dd>
- <dt><samp class="option">pts</samp></dt>
- <dd><p>The PTS (Presentation TimeStamp) of the filtered frame,
- expressed in <var class="var">TB</var> units. It’s NAN if undefined.
- </p>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>The PTS of the filtered frame,
- expressed in seconds. It’s NAN if undefined.
- </p>
- </dd>
- <dt><samp class="option">prev_pts</samp></dt>
- <dd><p>The PTS of the previously filtered frame. It’s NAN if undefined.
- </p>
- </dd>
- <dt><samp class="option">prev_selected_pts</samp></dt>
- <dd><p>The PTS of the last previously filtered frame. It’s NAN if undefined.
- </p>
- </dd>
- <dt><samp class="option">prev_selected_t</samp></dt>
- <dd><p>The PTS of the last previously selected frame, expressed in seconds. It’s NAN if undefined.
- </p>
- </dd>
- <dt><samp class="option">start_pts</samp></dt>
- <dd><p>The first PTS in the stream which is not NAN. It remains NAN if not found.
- </p>
- </dd>
- <dt><samp class="option">start_t</samp></dt>
- <dd><p>The first PTS, in seconds, in the stream which is not NAN. It remains NAN if not found.
- </p>
- </dd>
- <dt><samp class="option">pict_type <em class="emph">(video only)</em></samp></dt>
- <dd><p>The type of the filtered frame. It can assume one of the following
- values:
- </p><dl class="table">
- <dt><samp class="option">I</samp></dt>
- <dt><samp class="option">P</samp></dt>
- <dt><samp class="option">B</samp></dt>
- <dt><samp class="option">S</samp></dt>
- <dt><samp class="option">SI</samp></dt>
- <dt><samp class="option">SP</samp></dt>
- <dt><samp class="option">BI</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">interlace_type <em class="emph">(video only)</em></samp></dt>
- <dd><p>The frame interlace type. It can assume one of the following values:
- </p><dl class="table">
- <dt><samp class="option">PROGRESSIVE</samp></dt>
- <dd><p>The frame is progressive (not interlaced).
- </p></dd>
- <dt><samp class="option">TOPFIRST</samp></dt>
- <dd><p>The frame is top-field-first.
- </p></dd>
- <dt><samp class="option">BOTTOMFIRST</samp></dt>
- <dd><p>The frame is bottom-field-first.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">consumed_sample_n <em class="emph">(audio only)</em></samp></dt>
- <dd><p>the number of selected samples before the current frame
- </p>
- </dd>
- <dt><samp class="option">samples_n <em class="emph">(audio only)</em></samp></dt>
- <dd><p>the number of samples in the current frame
- </p>
- </dd>
- <dt><samp class="option">sample_rate <em class="emph">(audio only)</em></samp></dt>
- <dd><p>the input sample rate
- </p>
- </dd>
- <dt><samp class="option">key</samp></dt>
- <dd><p>This is 1 if the filtered frame is a key-frame, 0 otherwise.
- </p>
- </dd>
- <dt><samp class="option">pos</samp></dt>
- <dd><p>the position in the file of the filtered frame, -1 if the information
- is not available (e.g. for synthetic video); deprecated, do not use
- </p>
- </dd>
- <dt><samp class="option">scene <em class="emph">(video only)</em></samp></dt>
- <dd><p>value between 0 and 1 to indicate a new scene; a low value reflects a low
- probability for the current frame to introduce a new scene, while a higher
- value means the current frame is more likely to be one (see the example below)
- </p>
- </dd>
- <dt><samp class="option">concatdec_select</samp></dt>
- <dd><p>The concat demuxer can select only part of a concat input file by setting an
- inpoint and an outpoint, but the output packets may not be entirely contained
- in the selected interval. By using this variable, it is possible to skip frames
- generated by the concat demuxer which are not exactly contained in the selected
- interval.
- </p>
- <p>This works by comparing the frame pts against the <var class="var">lavf.concat.start_time</var>
- and the <var class="var">lavf.concat.duration</var> packet metadata values which are also
- present in the decoded frames.
- </p>
- <p>The <var class="var">concatdec_select</var> variable is -1 if the frame pts is at least
- start_time and either the duration metadata is missing or the frame pts is less
- than start_time + duration, 0 otherwise, and NaN if the start_time metadata is
- missing.
- </p>
- <p>That basically means that an input frame is selected if its pts is within the
- interval set by the concat demuxer.
- </p>
- </dd>
- <dt><samp class="option">iw <em class="emph">(video only)</em></samp></dt>
- <dd><p>Represents the width of the input video frame.
- </p>
- </dd>
- <dt><samp class="option">ih <em class="emph">(video only)</em></samp></dt>
- <dd><p>Represents the height of the input video frame.
- </p>
- </dd>
- <dt><samp class="option">view <em class="emph">(video only)</em></samp></dt>
- <dd><p>View ID for multi-view video.
- </p>
- </dd>
- </dl>
- <p>The default value of the select expression is "1".
- </p>
- <a name="Examples-218"></a>
- <h4 class="subsection">48.17.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-218" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-218" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Select all frames in input:
- <div class="example">
- <pre class="example-preformatted">select
- </pre></div>
- <p>The example above is the same as:
- </p><div class="example">
- <pre class="example-preformatted">select=1
- </pre></div>
- </li><li>Skip all frames:
- <div class="example">
- <pre class="example-preformatted">select=0
- </pre></div>
- </li><li>Select only I-frames:
- <div class="example">
- <pre class="example-preformatted">select='eq(pict_type\,I)'
- </pre></div>
- </li><li>Select one frame every 100:
- <div class="example">
- <pre class="example-preformatted">select='not(mod(n\,100))'
- </pre></div>
- </li><li>Select only frames contained in the 10-20 time interval:
- <div class="example">
- <pre class="example-preformatted">select=between(t\,10\,20)
- </pre></div>
- </li><li>Select only I-frames contained in the 10-20 time interval:
- <div class="example">
- <pre class="example-preformatted">select=between(t\,10\,20)*eq(pict_type\,I)
- </pre></div>
- </li><li>Select frames with a minimum distance of 10 seconds:
- <div class="example">
- <pre class="example-preformatted">select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
- </pre></div>
- </li><li>Use aselect to select only audio frames with samples number > 100:
- <div class="example">
- <pre class="example-preformatted">aselect='gt(samples_n\,100)'
- </pre></div>
- </li><li>Create a mosaic of the first scenes:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i video.avi -vf select='gt(scene\,0.4)',scale=160:120,tile -frames:v 1 preview.png
- </pre></div>
- <p>Comparing <var class="var">scene</var> against a value between 0.3 and 0.5 is generally a sane
- choice.
- </p>
- </li><li>Send even and odd frames to separate outputs, and compose them:
- <div class="example">
- <pre class="example-preformatted">select=n=2:e='mod(n, 2)+1' [odd][even]; [odd] pad=h=2*ih [tmp]; [tmp][even] overlay=y=h
- </pre></div>
- </li><li>Select useful frames from an ffconcat file which is using inpoints and
- outpoints but where the source files are not intra frame only.
- <div class="example">
- <pre class="example-preformatted">ffmpeg -copyts -vsync 0 -segment_time_metadata 1 -i input.ffconcat -vf select=concatdec_select -af aselect=concatdec_select output.avi
- </pre></div>
- </li></ul>
- <a name="sendcmd_002c-asendcmd"></a>
- <h3 class="section">48.18 sendcmd, asendcmd<span class="pull-right"><a class="anchor hidden-xs" href="#sendcmd_002c-asendcmd" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sendcmd_002c-asendcmd" aria-hidden="true">TOC</a></span></h3>
- <p>Send commands to filters in the filtergraph.
- </p>
- <p>These filters read commands to be sent to other filters in the
- filtergraph.
- </p>
- <p><code class="code">sendcmd</code> must be inserted between two video filters,
- <code class="code">asendcmd</code> must be inserted between two audio filters, but apart
- from that they act the same way.
- </p>
- <p>The specification of commands can be provided in the filter arguments
- with the <var class="var">commands</var> option, or in a file specified by the
- <var class="var">filename</var> option.
- </p>
- <p>These filters accept the following options:
- </p><dl class="table">
- <dt><samp class="option">commands, c</samp></dt>
- <dd><p>Set the commands to be read and sent to the other filters.
- </p></dd>
- <dt><samp class="option">filename, f</samp></dt>
- <dd><p>Set the filename of the commands to be read and sent to the other
- filters.
- </p></dd>
- </dl>
- <a name="Commands-syntax"></a>
- <h4 class="subsection">48.18.1 Commands syntax<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-syntax" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-syntax" aria-hidden="true">TOC</a></span></h4>
- <p>A commands description consists of a sequence of interval
- specifications, comprising a list of commands to be executed when a
- particular event related to that interval occurs. The occurring event
- is typically the current frame time entering or leaving a given time
- interval.
- </p>
- <p>An interval is specified by the following syntax:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">START</var>[-<var class="var">END</var>] <var class="var">COMMANDS</var>;
- </pre></div>
- <p>The time interval is specified by the <var class="var">START</var> and <var class="var">END</var> times.
- <var class="var">END</var> is optional and defaults to the maximum time.
- </p>
- <p>The current frame time is considered within the specified interval if
- it is included in the interval [<var class="var">START</var>, <var class="var">END</var>), that is when
- the time is greater or equal to <var class="var">START</var> and is lesser than
- <var class="var">END</var>.
- </p>
- <p><var class="var">COMMANDS</var> consists of a sequence of one or more command
- specifications, separated by ",", relating to that interval. The
- syntax of a command specification is given by:
- </p><div class="example">
- <pre class="example-preformatted">[<var class="var">FLAGS</var>] <var class="var">TARGET</var> <var class="var">COMMAND</var> <var class="var">ARG</var>
- </pre></div>
- <p><var class="var">FLAGS</var> is optional and specifies the type of events relating to
- the time interval which enable sending the specified command, and must
- be a non-null sequence of identifier flags separated by "+" or "|" and
- enclosed between "[" and "]".
- </p>
- <p>The following flags are recognized:
- </p><dl class="table">
- <dt><samp class="option">enter</samp></dt>
- <dd><p>The command is sent when the current frame timestamp enters the
- specified interval. In other words, the command is sent when the
- previous frame timestamp was not in the given interval, and the
- current is.
- </p>
- </dd>
- <dt><samp class="option">leave</samp></dt>
- <dd><p>The command is sent when the current frame timestamp leaves the
- specified interval. In other words, the command is sent when the
- previous frame timestamp was in the given interval, and the
- current is not.
- </p>
- </dd>
- <dt><samp class="option">expr</samp></dt>
- <dd><p>The command <var class="var">ARG</var> is interpreted as expression and result of
- expression is passed as <var class="var">ARG</var>.
- </p>
- <p>The expression is evaluated through the eval API and can contain the following
- constants:
- </p>
- <dl class="table">
- <dt><samp class="option">POS</samp></dt>
- <dd><p>Original position in the file of the frame, or undefined if undefined
- for the current frame. Deprecated, do not use.
- </p>
- </dd>
- <dt><samp class="option">PTS</samp></dt>
- <dd><p>The presentation timestamp in input.
- </p>
- </dd>
- <dt><samp class="option">N</samp></dt>
- <dd><p>The count of the input frame for video or audio, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">T</samp></dt>
- <dd><p>The time in seconds of the current frame.
- </p>
- </dd>
- <dt><samp class="option">TS</samp></dt>
- <dd><p>The start time in seconds of the current command interval.
- </p>
- </dd>
- <dt><samp class="option">TE</samp></dt>
- <dd><p>The end time in seconds of the current command interval.
- </p>
- </dd>
- <dt><samp class="option">TI</samp></dt>
- <dd><p>The interpolated time of the current command interval, TI = (T - TS) / (TE - TS).
- </p>
- </dd>
- <dt><samp class="option">W</samp></dt>
- <dd><p>The video frame width.
- </p>
- </dd>
- <dt><samp class="option">H</samp></dt>
- <dd><p>The video frame height.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <p>If <var class="var">FLAGS</var> is not specified, a default value of <code class="code">[enter]</code> is
- assumed.
- </p>
- <p><var class="var">TARGET</var> specifies the target of the command, usually the name of
- the filter class or a specific filter instance name.
- </p>
- <p><var class="var">COMMAND</var> specifies the name of the command for the target filter.
- </p>
- <p><var class="var">ARG</var> is optional and specifies the optional list of argument for
- the given <var class="var">COMMAND</var>.
- </p>
- <p>Between one interval specification and another, whitespaces, or
- sequences of characters starting with <code class="code">#</code> until the end of line,
- are ignored and can be used to annotate comments.
- </p>
- <p>A simplified BNF description of the commands specification syntax
- follows:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">COMMAND_FLAG</var> ::= "enter" | "leave"
- <var class="var">COMMAND_FLAGS</var> ::= <var class="var">COMMAND_FLAG</var> [(+|"|")<var class="var">COMMAND_FLAG</var>]
- <var class="var">COMMAND</var> ::= ["[" <var class="var">COMMAND_FLAGS</var> "]"] <var class="var">TARGET</var> <var class="var">COMMAND</var> [<var class="var">ARG</var>]
- <var class="var">COMMANDS</var> ::= <var class="var">COMMAND</var> [,<var class="var">COMMANDS</var>]
- <var class="var">INTERVAL</var> ::= <var class="var">START</var>[-<var class="var">END</var>] <var class="var">COMMANDS</var>
- <var class="var">INTERVALS</var> ::= <var class="var">INTERVAL</var>[;<var class="var">INTERVALS</var>]
- </pre></div>
- <a name="Examples-219"></a>
- <h4 class="subsection">48.18.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-219" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-219" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Specify audio tempo change at second 4:
- <div class="example">
- <pre class="example-preformatted">asendcmd=c='4.0 atempo tempo 1.5',atempo
- </pre></div>
- </li><li>Target a specific filter instance:
- <div class="example">
- <pre class="example-preformatted">asendcmd=c='4.0 atempo@my tempo 1.5',atempo@my
- </pre></div>
- </li><li>Specify a list of drawtext and hue commands in a file.
- <div class="example">
- <pre class="example-preformatted"># show text in the interval 5-10
- 5.0-10.0 [enter] drawtext reinit 'fontfile=FreeSerif.ttf:text=hello world',
- [leave] drawtext reinit 'fontfile=FreeSerif.ttf:text=';
- # desaturate the image in the interval 15-20
- 15.0-20.0 [enter] hue s 0,
- [enter] drawtext reinit 'fontfile=FreeSerif.ttf:text=nocolor',
- [leave] hue s 1,
- [leave] drawtext reinit 'fontfile=FreeSerif.ttf:text=color';
- # apply an exponential saturation fade-out effect, starting from time 25
- 25 [enter] hue s exp(25-t)
- </pre></div>
- <p>A filtergraph allowing to read and process the above command list
- stored in a file <samp class="file">test.cmd</samp>, can be specified with:
- </p><div class="example">
- <pre class="example-preformatted">sendcmd=f=test.cmd,drawtext=fontfile=FreeSerif.ttf:text='',hue
- </pre></div>
- </li></ul>
- <a class="anchor" id="setpts"></a><a name="setpts_002c-asetpts"></a>
- <h3 class="section">48.19 setpts, asetpts<span class="pull-right"><a class="anchor hidden-xs" href="#setpts_002c-asetpts" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-setpts_002c-asetpts" aria-hidden="true">TOC</a></span></h3>
- <p>Change the PTS (presentation timestamp) of the input frames.
- </p>
- <p><code class="code">setpts</code> works on video frames, <code class="code">asetpts</code> on audio frames.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">expr</samp></dt>
- <dd><p>The expression which is evaluated for each frame to construct its timestamp.
- </p>
- </dd>
- <dt><samp class="option">strip_fps (<em class="emph">video only</em>)</samp></dt>
- <dd><p>Boolean option which determines if the original framerate and frame duration
- metadata is unset. If set to true, be advised that a sane frame rate should be
- explicitly specified if output is sent to a constant frame rate muxer.
- Default is <code class="code">false</code>.
- </p>
- </dd>
- </dl>
- <p>The expression is evaluated through the eval API and can contain the following
- constants:
- </p>
- <dl class="table">
- <dt><samp class="option">FRAME_RATE, FR</samp></dt>
- <dd><p>frame rate, only defined for constant frame-rate video
- </p>
- </dd>
- <dt><samp class="option">PTS</samp></dt>
- <dd><p>The presentation timestamp in input
- </p>
- </dd>
- <dt><samp class="option">N</samp></dt>
- <dd><p>The count of the input frame for video or the number of consumed samples,
- not including the current frame for audio, starting from 0.
- </p>
- </dd>
- <dt><samp class="option">NB_CONSUMED_SAMPLES</samp></dt>
- <dd><p>The number of consumed samples, not including the current frame (only
- audio)
- </p>
- </dd>
- <dt><samp class="option">NB_SAMPLES, S</samp></dt>
- <dd><p>The number of samples in the current frame (only audio)
- </p>
- </dd>
- <dt><samp class="option">SAMPLE_RATE, SR</samp></dt>
- <dd><p>The audio sample rate.
- </p>
- </dd>
- <dt><samp class="option">STARTPTS</samp></dt>
- <dd><p>The PTS of the first frame.
- </p>
- </dd>
- <dt><samp class="option">STARTT</samp></dt>
- <dd><p>the time in seconds of the first frame
- </p>
- </dd>
- <dt><samp class="option">INTERLACED</samp></dt>
- <dd><p>State whether the current frame is interlaced.
- </p>
- </dd>
- <dt><samp class="option">T</samp></dt>
- <dd><p>the time in seconds of the current frame
- </p>
- </dd>
- <dt><samp class="option">POS</samp></dt>
- <dd><p>original position in the file of the frame, or undefined if undefined
- for the current frame; deprecated, do not use
- </p>
- </dd>
- <dt><samp class="option">PREV_INPTS</samp></dt>
- <dd><p>The previous input PTS.
- </p>
- </dd>
- <dt><samp class="option">PREV_INT</samp></dt>
- <dd><p>previous input time in seconds
- </p>
- </dd>
- <dt><samp class="option">PREV_OUTPTS</samp></dt>
- <dd><p>The previous output PTS.
- </p>
- </dd>
- <dt><samp class="option">PREV_OUTT</samp></dt>
- <dd><p>previous output time in seconds
- </p>
- </dd>
- <dt><samp class="option">RTCTIME</samp></dt>
- <dd><p>The wallclock (RTC) time in microseconds. This is deprecated, use time(0)
- instead.
- </p>
- </dd>
- <dt><samp class="option">RTCSTART</samp></dt>
- <dd><p>The wallclock (RTC) time at the start of the movie in microseconds.
- </p>
- </dd>
- <dt><samp class="option">TB</samp></dt>
- <dd><p>The timebase of the input timestamps.
- </p>
- </dd>
- <dt><samp class="option">T_CHANGE</samp></dt>
- <dd><p>Time of the first frame after command was applied or time of the first frame if no commands.
- </p>
- </dd>
- </dl>
- <a name="Examples-220"></a>
- <h4 class="subsection">48.19.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-220" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-220" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Start counting PTS from zero
- <div class="example">
- <pre class="example-preformatted">setpts=PTS-STARTPTS
- </pre></div>
- </li><li>Apply fast motion effect:
- <div class="example">
- <pre class="example-preformatted">setpts=0.5*PTS
- </pre></div>
- </li><li>Apply slow motion effect:
- <div class="example">
- <pre class="example-preformatted">setpts=2.0*PTS
- </pre></div>
- </li><li>Set fixed rate of 25 frames per second:
- <div class="example">
- <pre class="example-preformatted">setpts=N/(25*TB)
- </pre></div>
- </li><li>Apply a random jitter effect of +/-100 TB units:
- <div class="example">
- <pre class="example-preformatted">setpts=PTS+randomi(0, -100\,100)
- </pre></div>
- </li><li>Set fixed rate 25 fps with some jitter:
- <div class="example">
- <pre class="example-preformatted">setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
- </pre></div>
- </li><li>Apply an offset of 10 seconds to the input PTS:
- <div class="example">
- <pre class="example-preformatted">setpts=PTS+10/TB
- </pre></div>
- </li><li>Generate timestamps from a "live source" and rebase onto the current timebase:
- <div class="example">
- <pre class="example-preformatted">setpts='(RTCTIME - RTCSTART) / (TB * 1000000)'
- </pre></div>
- </li><li>Generate timestamps by counting samples:
- <div class="example">
- <pre class="example-preformatted">asetpts=N/SR/TB
- </pre></div>
- </li></ul>
- <a name="Commands-163"></a>
- <h4 class="subsection">48.19.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-163" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-163" aria-hidden="true">TOC</a></span></h4>
- <p>Both filters support all above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a name="setrange"></a>
- <h3 class="section">48.20 setrange<span class="pull-right"><a class="anchor hidden-xs" href="#setrange" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-setrange" aria-hidden="true">TOC</a></span></h3>
- <p>Force color range for the output video frame.
- </p>
- <p>The <code class="code">setrange</code> filter marks the color range property for the
- output frames. It does not change the input frame, but only sets the
- corresponding property, which affects how the frame is treated by
- following filters.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">range</samp></dt>
- <dd><p>Available values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">auto</samp>’</dt>
- <dd><p>Keep the same color range property.
- </p>
- </dd>
- <dt>‘<samp class="samp">unspecified, unknown</samp>’</dt>
- <dd><p>Set the color range as unspecified.
- </p>
- </dd>
- <dt>‘<samp class="samp">limited, tv, mpeg</samp>’</dt>
- <dd><p>Set the color range as limited.
- </p>
- </dd>
- <dt>‘<samp class="samp">full, pc, jpeg</samp>’</dt>
- <dd><p>Set the color range as full.
- </p></dd>
- </dl>
- </dd>
- </dl>
- <a name="settb_002c-asettb"></a>
- <h3 class="section">48.21 settb, asettb<span class="pull-right"><a class="anchor hidden-xs" href="#settb_002c-asettb" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-settb_002c-asettb" aria-hidden="true">TOC</a></span></h3>
- <p>Set the timebase to use for the output frames timestamps.
- It is mainly useful for testing timebase configuration.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">expr, tb</samp></dt>
- <dd><p>The expression which is evaluated into the output timebase.
- </p>
- </dd>
- </dl>
- <p>The value for <samp class="option">tb</samp> is an arithmetic expression representing a
- rational. The expression can contain the constants "AVTB" (the default
- timebase), "intb" (the input timebase) and "sr" (the sample rate,
- audio only). Default value is "intb".
- </p>
- <a name="Examples-221"></a>
- <h4 class="subsection">48.21.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-221" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-221" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Set the timebase to 1/25:
- <div class="example">
- <pre class="example-preformatted">settb=expr=1/25
- </pre></div>
- </li><li>Set the timebase to 1/10:
- <div class="example">
- <pre class="example-preformatted">settb=expr=0.1
- </pre></div>
- </li><li>Set the timebase to 1001/1000:
- <div class="example">
- <pre class="example-preformatted">settb=1+0.001
- </pre></div>
- </li><li>Set the timebase to 2*intb:
- <div class="example">
- <pre class="example-preformatted">settb=2*intb
- </pre></div>
- </li><li>Set the default timebase value:
- <div class="example">
- <pre class="example-preformatted">settb=AVTB
- </pre></div>
- </li></ul>
- <a name="showcqt"></a>
- <h3 class="section">48.22 showcqt<span class="pull-right"><a class="anchor hidden-xs" href="#showcqt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showcqt" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a video output representing frequency spectrum
- logarithmically using Brown-Puckette constant Q transform algorithm with
- direct frequency domain coefficient calculation (but the transform itself
- is not really constant Q, instead the Q factor is actually variable/clamped),
- with musical tone scale, from E0 to D#10.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. It must be even. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">1920x1080</code>.
- </p>
- </dd>
- <dt><samp class="option">fps, rate, r</samp></dt>
- <dd><p>Set the output frame rate. Default value is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">bar_h</samp></dt>
- <dd><p>Set the bargraph height. It must be even. Default value is <code class="code">-1</code> which
- computes the bargraph height automatically.
- </p>
- </dd>
- <dt><samp class="option">axis_h</samp></dt>
- <dd><p>Set the axis height. It must be even. Default value is <code class="code">-1</code> which computes
- the axis height automatically.
- </p>
- </dd>
- <dt><samp class="option">sono_h</samp></dt>
- <dd><p>Set the sonogram height. It must be even. Default value is <code class="code">-1</code> which
- computes the sonogram height automatically.
- </p>
- </dd>
- <dt><samp class="option">fullhd</samp></dt>
- <dd><p>Set the fullhd resolution. This option is deprecated, use <var class="var">size</var>, <var class="var">s</var>
- instead. Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">sono_v, volume</samp></dt>
- <dd><p>Specify the sonogram volume expression. It can contain variables:
- </p><dl class="table">
- <dt><samp class="option">bar_v</samp></dt>
- <dd><p>the <var class="var">bar_v</var> evaluated expression
- </p></dd>
- <dt><samp class="option">frequency, freq, f</samp></dt>
- <dd><p>the frequency where it is evaluated
- </p></dd>
- <dt><samp class="option">timeclamp, tc</samp></dt>
- <dd><p>the value of <var class="var">timeclamp</var> option
- </p></dd>
- </dl>
- <p>and functions:
- </p><dl class="table">
- <dt><samp class="option">a_weighting(f)</samp></dt>
- <dd><p>A-weighting of equal loudness
- </p></dd>
- <dt><samp class="option">b_weighting(f)</samp></dt>
- <dd><p>B-weighting of equal loudness
- </p></dd>
- <dt><samp class="option">c_weighting(f)</samp></dt>
- <dd><p>C-weighting of equal loudness.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">16</code>.
- </p>
- </dd>
- <dt><samp class="option">bar_v, volume2</samp></dt>
- <dd><p>Specify the bargraph volume expression. It can contain variables:
- </p><dl class="table">
- <dt><samp class="option">sono_v</samp></dt>
- <dd><p>the <var class="var">sono_v</var> evaluated expression
- </p></dd>
- <dt><samp class="option">frequency, freq, f</samp></dt>
- <dd><p>the frequency where it is evaluated
- </p></dd>
- <dt><samp class="option">timeclamp, tc</samp></dt>
- <dd><p>the value of <var class="var">timeclamp</var> option
- </p></dd>
- </dl>
- <p>and functions:
- </p><dl class="table">
- <dt><samp class="option">a_weighting(f)</samp></dt>
- <dd><p>A-weighting of equal loudness
- </p></dd>
- <dt><samp class="option">b_weighting(f)</samp></dt>
- <dd><p>B-weighting of equal loudness
- </p></dd>
- <dt><samp class="option">c_weighting(f)</samp></dt>
- <dd><p>C-weighting of equal loudness.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">sono_v</code>.
- </p>
- </dd>
- <dt><samp class="option">sono_g, gamma</samp></dt>
- <dd><p>Specify the sonogram gamma. Lower gamma makes the spectrum more contrast,
- higher gamma makes the spectrum having more range. Default value is <code class="code">3</code>.
- Acceptable range is <code class="code">[1, 7]</code>.
- </p>
- </dd>
- <dt><samp class="option">bar_g, gamma2</samp></dt>
- <dd><p>Specify the bargraph gamma. Default value is <code class="code">1</code>. Acceptable range is
- <code class="code">[1, 7]</code>.
- </p>
- </dd>
- <dt><samp class="option">bar_t</samp></dt>
- <dd><p>Specify the bargraph transparency level. Lower value makes the bargraph sharper.
- Default value is <code class="code">1</code>. Acceptable range is <code class="code">[0, 1]</code>.
- </p>
- </dd>
- <dt><samp class="option">timeclamp, tc</samp></dt>
- <dd><p>Specify the transform timeclamp. At low frequency, there is trade-off between
- accuracy in time domain and frequency domain. If timeclamp is lower,
- event in time domain is represented more accurately (such as fast bass drum),
- otherwise event in frequency domain is represented more accurately
- (such as bass guitar). Acceptable range is <code class="code">[0.002, 1]</code>. Default value is <code class="code">0.17</code>.
- </p>
- </dd>
- <dt><samp class="option">attack</samp></dt>
- <dd><p>Set attack time in seconds. The default is <code class="code">0</code> (disabled). Otherwise, it
- limits future samples by applying asymmetric windowing in time domain, useful
- when low latency is required. Accepted range is <code class="code">[0, 1]</code>.
- </p>
- </dd>
- <dt><samp class="option">basefreq</samp></dt>
- <dd><p>Specify the transform base frequency. Default value is <code class="code">20.01523126408007475</code>,
- which is frequency 50 cents below E0. Acceptable range is <code class="code">[10, 100000]</code>.
- </p>
- </dd>
- <dt><samp class="option">endfreq</samp></dt>
- <dd><p>Specify the transform end frequency. Default value is <code class="code">20495.59681441799654</code>,
- which is frequency 50 cents above D#10. Acceptable range is <code class="code">[10, 100000]</code>.
- </p>
- </dd>
- <dt><samp class="option">coeffclamp</samp></dt>
- <dd><p>This option is deprecated and ignored.
- </p>
- </dd>
- <dt><samp class="option">tlength</samp></dt>
- <dd><p>Specify the transform length in time domain. Use this option to control accuracy
- trade-off between time domain and frequency domain at every frequency sample.
- It can contain variables:
- </p><dl class="table">
- <dt><samp class="option">frequency, freq, f</samp></dt>
- <dd><p>the frequency where it is evaluated
- </p></dd>
- <dt><samp class="option">timeclamp, tc</samp></dt>
- <dd><p>the value of <var class="var">timeclamp</var> option.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">384*tc/(384+tc*f)</code>.
- </p>
- </dd>
- <dt><samp class="option">count</samp></dt>
- <dd><p>Specify the transform count for every video frame. Default value is <code class="code">6</code>.
- Acceptable range is <code class="code">[1, 30]</code>.
- </p>
- </dd>
- <dt><samp class="option">fcount</samp></dt>
- <dd><p>Specify the transform count for every single pixel. Default value is <code class="code">0</code>,
- which makes it computed automatically. Acceptable range is <code class="code">[0, 10]</code>.
- </p>
- </dd>
- <dt><samp class="option">fontfile</samp></dt>
- <dd><p>Specify font file for use with freetype to draw the axis. If not specified,
- use embedded font. Note that drawing with font file or embedded font is not
- implemented with custom <var class="var">basefreq</var> and <var class="var">endfreq</var>, use <var class="var">axisfile</var>
- option instead.
- </p>
- </dd>
- <dt><samp class="option">font</samp></dt>
- <dd><p>Specify fontconfig pattern. This has lower priority than <var class="var">fontfile</var>. The
- <code class="code">:</code> in the pattern may be replaced by <code class="code">|</code> to avoid unnecessary
- escaping.
- </p>
- </dd>
- <dt><samp class="option">fontcolor</samp></dt>
- <dd><p>Specify font color expression. This is arithmetic expression that should return
- integer value 0xRRGGBB. It can contain variables:
- </p><dl class="table">
- <dt><samp class="option">frequency, freq, f</samp></dt>
- <dd><p>the frequency where it is evaluated
- </p></dd>
- <dt><samp class="option">timeclamp, tc</samp></dt>
- <dd><p>the value of <var class="var">timeclamp</var> option
- </p></dd>
- </dl>
- <p>and functions:
- </p><dl class="table">
- <dt><samp class="option">midi(f)</samp></dt>
- <dd><p>midi number of frequency f, some midi numbers: E0(16), C1(24), C2(36), A4(69)
- </p></dd>
- <dt><samp class="option">r(x), g(x), b(x)</samp></dt>
- <dd><p>red, green, and blue value of intensity x.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">st(0, (midi(f)-59.5)/12);
- st(1, if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0));
- r(1-ld(1)) + b(ld(1))</code>.
- </p>
- </dd>
- <dt><samp class="option">axisfile</samp></dt>
- <dd><p>Specify image file to draw the axis. This option override <var class="var">fontfile</var> and
- <var class="var">fontcolor</var> option.
- </p>
- </dd>
- <dt><samp class="option">axis, text</samp></dt>
- <dd><p>Enable/disable drawing text to the axis. If it is set to <code class="code">0</code>, drawing to
- the axis is disabled, ignoring <var class="var">fontfile</var> and <var class="var">axisfile</var> option.
- Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">csp</samp></dt>
- <dd><p>Set colorspace. The accepted values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">unspecified</samp>’</dt>
- <dd><p>Unspecified (default)
- </p>
- </dd>
- <dt>‘<samp class="samp">bt709</samp>’</dt>
- <dd><p>BT.709
- </p>
- </dd>
- <dt>‘<samp class="samp">fcc</samp>’</dt>
- <dd><p>FCC
- </p>
- </dd>
- <dt>‘<samp class="samp">bt470bg</samp>’</dt>
- <dd><p>BT.470BG or BT.601-6 625
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte170m</samp>’</dt>
- <dd><p>SMPTE-170M or BT.601-6 525
- </p>
- </dd>
- <dt>‘<samp class="samp">smpte240m</samp>’</dt>
- <dd><p>SMPTE-240M
- </p>
- </dd>
- <dt>‘<samp class="samp">bt2020ncl</samp>’</dt>
- <dd><p>BT.2020 with non-constant luminance
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">cscheme</samp></dt>
- <dd><p>Set spectrogram color scheme. This is list of floating point values with format
- <code class="code">left_r|left_g|left_b|right_r|right_g|right_b</code>.
- The default is <code class="code">1|0.5|0|0|0.5|1</code>.
- </p>
- </dd>
- </dl>
- <a name="Examples-222"></a>
- <h4 class="subsection">48.22.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-222" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-222" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Playing audio while showing the spectrum:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt [out0]'
- </pre></div>
- </li><li>Same as above, but with frame rate 30 fps:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=fps=30:count=5 [out0]'
- </pre></div>
- </li><li>Playing at 1280x720:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=s=1280x720:count=4 [out0]'
- </pre></div>
- </li><li>Disable sonogram display:
- <div class="example">
- <pre class="example-preformatted">sono_h=0
- </pre></div>
- </li><li>A1 and its harmonics: A1, A2, (near)E3, A3:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
- asplit[a][out1]; [a] showcqt [out0]'
- </pre></div>
- </li><li>Same as above, but with more accuracy in frequency domain:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
- asplit[a][out1]; [a] showcqt=timeclamp=0.5 [out0]'
- </pre></div>
- </li><li>Custom volume:
- <div class="example">
- <pre class="example-preformatted">bar_v=10:sono_v=bar_v*a_weighting(f)
- </pre></div>
- </li><li>Custom gamma, now spectrum is linear to the amplitude.
- <div class="example">
- <pre class="example-preformatted">bar_g=2:sono_g=2
- </pre></div>
- </li><li>Custom tlength equation:
- <div class="example">
- <pre class="example-preformatted">tc=0.33:tlength='st(0,0.17); 384*tc / (384 / ld(0) + tc*f /(1-ld(0))) + 384*tc / (tc*f / ld(0) + 384 /(1-ld(0)))'
- </pre></div>
- </li><li>Custom fontcolor and fontfile, C-note is colored green, others are colored blue:
- <div class="example">
- <pre class="example-preformatted">fontcolor='if(mod(floor(midi(f)+0.5),12), 0x0000FF, g(1))':fontfile=myfont.ttf
- </pre></div>
- </li><li>Custom font using fontconfig:
- <div class="example">
- <pre class="example-preformatted">font='Courier New,Monospace,mono|bold'
- </pre></div>
- </li><li>Custom frequency range with custom axis using image file:
- <div class="example">
- <pre class="example-preformatted">axisfile=myaxis.png:basefreq=40:endfreq=10000
- </pre></div>
- </li></ul>
- <a name="showcwt"></a>
- <h3 class="section">48.23 showcwt<span class="pull-right"><a class="anchor hidden-xs" href="#showcwt" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showcwt" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to video output representing frequency spectrum
- using Continuous Wavelet Transform and Morlet wavelet.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option,
- check the <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">640x512</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the output frame rate. Default value is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set the frequency scale used. Allowed values are:
- </p>
- <dl class="table">
- <dt><samp class="option">linear</samp></dt>
- <dt><samp class="option">log</samp></dt>
- <dt><samp class="option">bark</samp></dt>
- <dt><samp class="option">mel</samp></dt>
- <dt><samp class="option">erbs</samp></dt>
- <dt><samp class="option">sqrt</samp></dt>
- <dt><samp class="option">cbrt</samp></dt>
- <dt><samp class="option">qdrt</samp></dt>
- <dt><samp class="option">fm</samp></dt>
- </dl>
- <p>Default value is <code class="code">linear</code>.
- </p>
- </dd>
- <dt><samp class="option">iscale</samp></dt>
- <dd><p>Set the intensity scale used. Allowed values are:
- </p>
- <dl class="table">
- <dt><samp class="option">linear</samp></dt>
- <dt><samp class="option">log</samp></dt>
- <dt><samp class="option">sqrt</samp></dt>
- <dt><samp class="option">cbrt</samp></dt>
- <dt><samp class="option">qdrt</samp></dt>
- </dl>
- <p>Default value is <code class="code">log</code>.
- </p>
- </dd>
- <dt><samp class="option">min</samp></dt>
- <dd><p>Set the minimum frequency that will be used in output.
- Default is <code class="code">20</code> Hz.
- </p>
- </dd>
- <dt><samp class="option">max</samp></dt>
- <dd><p>Set the maximum frequency that will be used in output.
- Default is <code class="code">20000</code> Hz. The real frequency upper limit
- depends on input audio’s sample rate and such will be enforced
- on this value when it is set to value greater than Nyquist frequency.
- </p>
- </dd>
- <dt><samp class="option">imin</samp></dt>
- <dd><p>Set the minimum intensity that will be used in output.
- </p>
- </dd>
- <dt><samp class="option">imax</samp></dt>
- <dd><p>Set the maximum intensity that will be used in output.
- </p>
- </dd>
- <dt><samp class="option">logb</samp></dt>
- <dd><p>Set the logarithmic basis for brightness strength when
- mapping calculated magnitude values to pixel values.
- Allowed range is from <code class="code">0</code> to <code class="code">1</code>.
- Default value is <code class="code">0.0001</code>.
- </p>
- </dd>
- <dt><samp class="option">deviation</samp></dt>
- <dd><p>Set the frequency deviation.
- Lower values than <code class="code">1</code> are more frequency oriented,
- while higher values than <code class="code">1</code> are more time oriented.
- Allowed range is from <code class="code">0</code> to <code class="code">10</code>.
- Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">pps</samp></dt>
- <dd><p>Set the number of pixel output per each second in one row.
- Allowed range is from <code class="code">1</code> to <code class="code">1024</code>.
- Default value is <code class="code">64</code>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set the output visual mode. Allowed values are:
- </p>
- <dl class="table">
- <dt><samp class="option">magnitude</samp></dt>
- <dd><p>Show magnitude.
- </p></dd>
- <dt><samp class="option">phase</samp></dt>
- <dd><p>Show only phase.
- </p></dd>
- <dt><samp class="option">magphase</samp></dt>
- <dd><p>Show combination of magnitude and phase.
- Magnitude is mapped to brightness and phase to color.
- </p></dd>
- <dt><samp class="option">channel</samp></dt>
- <dd><p>Show unique color per channel magnitude.
- </p></dd>
- <dt><samp class="option">stereo</samp></dt>
- <dd><p>Show unique color per stereo difference.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">magnitude</code>.
- </p>
- </dd>
- <dt><samp class="option">slide</samp></dt>
- <dd><p>Set the output slide method. Allowed values are:
- </p>
- <dl class="table">
- <dt><samp class="option">replace</samp></dt>
- <dt><samp class="option">scroll</samp></dt>
- <dt><samp class="option">frame</samp></dt>
- </dl>
- </dd>
- <dt><samp class="option">direction</samp></dt>
- <dd><p>Set the direction method for output slide method. Allowed values are:
- </p>
- <dl class="table">
- <dt><samp class="option">lr</samp></dt>
- <dd><p>Direction from left to right.
- </p></dd>
- <dt><samp class="option">rl</samp></dt>
- <dd><p>Direction from right to left.
- </p></dd>
- <dt><samp class="option">ud</samp></dt>
- <dd><p>Direction from up to down.
- </p></dd>
- <dt><samp class="option">du</samp></dt>
- <dd><p>Direction from down to up.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">bar</samp></dt>
- <dd><p>Set the ratio of bargraph display to display size. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">rotation</samp></dt>
- <dd><p>Set color rotation, must be in [-1.0, 1.0] range.
- Default value is <code class="code">0</code>.
- </p></dd>
- </dl>
- <a name="showfreqs"></a>
- <h3 class="section">48.24 showfreqs<span class="pull-right"><a class="anchor hidden-xs" href="#showfreqs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showfreqs" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to video output representing the audio power spectrum.
- Audio amplitude is on Y-axis while frequency is on X-axis.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify size of video. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default is <code class="code">1024x512</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set video rate. Default is <code class="code">25</code>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set display mode.
- This set how each frequency bin will be represented.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">line</samp>’</dt>
- <dt>‘<samp class="samp">bar</samp>’</dt>
- <dt>‘<samp class="samp">dot</samp>’</dt>
- </dl>
- <p>Default is <code class="code">bar</code>.
- </p>
- </dd>
- <dt><samp class="option">ascale</samp></dt>
- <dd><p>Set amplitude scale.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>Linear scale.
- </p>
- </dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>Square root scale.
- </p>
- </dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>Cubic root scale.
- </p>
- </dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>Logarithmic scale.
- </p></dd>
- </dl>
- <p>Default is <code class="code">log</code>.
- </p>
- </dd>
- <dt><samp class="option">fscale</samp></dt>
- <dd><p>Set frequency scale.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>Linear scale.
- </p>
- </dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>Logarithmic scale.
- </p>
- </dd>
- <dt>‘<samp class="samp">rlog</samp>’</dt>
- <dd><p>Reverse logarithmic scale.
- </p></dd>
- </dl>
- <p>Default is <code class="code">lin</code>.
- </p>
- </dd>
- <dt><samp class="option">win_size</samp></dt>
- <dd><p>Set window size. Allowed range is from 16 to 65536.
- </p>
- <p>Default is <code class="code">2048</code>
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set windowing function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default is <code class="code">hanning</code>.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set window overlap. In range <code class="code">[0, 1]</code>. Default is <code class="code">1</code>,
- which means optimal overlap for selected window function will be picked.
- </p>
- </dd>
- <dt><samp class="option">averaging</samp></dt>
- <dd><p>Set time averaging. Setting this to 0 will display current maximal peaks.
- Default is <code class="code">1</code>, which means time averaging is disabled.
- </p>
- </dd>
- <dt><samp class="option">colors</samp></dt>
- <dd><p>Specify list of colors separated by space or by ’|’ which will be used to
- draw channel frequencies. Unrecognized or missing colors will be replaced
- by white color.
- </p>
- </dd>
- <dt><samp class="option">cmode</samp></dt>
- <dd><p>Set channel display mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">combined</samp>’</dt>
- <dt>‘<samp class="samp">separate</samp>’</dt>
- </dl>
- <p>Default is <code class="code">combined</code>.
- </p>
- </dd>
- <dt><samp class="option">minamp</samp></dt>
- <dd><p>Set minimum amplitude used in <code class="code">log</code> amplitude scaler.
- </p>
- </dd>
- <dt><samp class="option">data</samp></dt>
- <dd><p>Set data display mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">magnitude</samp>’</dt>
- <dt>‘<samp class="samp">phase</samp>’</dt>
- <dt>‘<samp class="samp">delay</samp>’</dt>
- </dl>
- <p>Default is <code class="code">magnitude</code>.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set channels to use when processing audio. By default all are processed.
- </p></dd>
- </dl>
- <a name="showspatial"></a>
- <h3 class="section">48.25 showspatial<span class="pull-right"><a class="anchor hidden-xs" href="#showspatial" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showspatial" aria-hidden="true">TOC</a></span></h3>
- <p>Convert stereo input audio to a video output, representing the spatial relationship
- between two channels.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">512x512</code>.
- </p>
- </dd>
- <dt><samp class="option">win_size</samp></dt>
- <dd><p>Set window size. Allowed range is from <var class="var">1024</var> to <var class="var">65536</var>. Default size is <var class="var">4096</var>.
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hann</samp>’</dt>
- <dt>‘<samp class="samp">hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default value is <code class="code">hann</code>.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set output framerate.
- </p></dd>
- </dl>
- <a class="anchor" id="showspectrum"></a><a name="showspectrum-1"></a>
- <h3 class="section">48.26 showspectrum<span class="pull-right"><a class="anchor hidden-xs" href="#showspectrum-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showspectrum-1" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a video output, representing the audio frequency
- spectrum.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">640x512</code>.
- </p>
- </dd>
- <dt><samp class="option">slide</samp></dt>
- <dd><p>Specify how the spectrum should slide along the window.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">replace</samp>’</dt>
- <dd><p>the samples start again on the left when they reach the right
- </p></dd>
- <dt>‘<samp class="samp">scroll</samp>’</dt>
- <dd><p>the samples scroll from right to left
- </p></dd>
- <dt>‘<samp class="samp">fullframe</samp>’</dt>
- <dd><p>frames are only produced when the samples reach the right
- </p></dd>
- <dt>‘<samp class="samp">rscroll</samp>’</dt>
- <dd><p>the samples scroll from left to right
- </p></dd>
- <dt>‘<samp class="samp">lreplace</samp>’</dt>
- <dd><p>the samples start again on the right when they reach the left
- </p></dd>
- </dl>
- <p>Default value is <code class="code">replace</code>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Specify display mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">combined</samp>’</dt>
- <dd><p>all channels are displayed in the same row
- </p></dd>
- <dt>‘<samp class="samp">separate</samp>’</dt>
- <dd><p>all channels are displayed in separate rows
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">combined</samp>’.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify display color mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">channel</samp>’</dt>
- <dd><p>each channel is displayed in a separate color
- </p></dd>
- <dt>‘<samp class="samp">intensity</samp>’</dt>
- <dd><p>each channel is displayed using the same color scheme
- </p></dd>
- <dt>‘<samp class="samp">rainbow</samp>’</dt>
- <dd><p>each channel is displayed using the rainbow color scheme
- </p></dd>
- <dt>‘<samp class="samp">moreland</samp>’</dt>
- <dd><p>each channel is displayed using the moreland color scheme
- </p></dd>
- <dt>‘<samp class="samp">nebulae</samp>’</dt>
- <dd><p>each channel is displayed using the nebulae color scheme
- </p></dd>
- <dt>‘<samp class="samp">fire</samp>’</dt>
- <dd><p>each channel is displayed using the fire color scheme
- </p></dd>
- <dt>‘<samp class="samp">fiery</samp>’</dt>
- <dd><p>each channel is displayed using the fiery color scheme
- </p></dd>
- <dt>‘<samp class="samp">fruit</samp>’</dt>
- <dd><p>each channel is displayed using the fruit color scheme
- </p></dd>
- <dt>‘<samp class="samp">cool</samp>’</dt>
- <dd><p>each channel is displayed using the cool color scheme
- </p></dd>
- <dt>‘<samp class="samp">magma</samp>’</dt>
- <dd><p>each channel is displayed using the magma color scheme
- </p></dd>
- <dt>‘<samp class="samp">green</samp>’</dt>
- <dd><p>each channel is displayed using the green color scheme
- </p></dd>
- <dt>‘<samp class="samp">viridis</samp>’</dt>
- <dd><p>each channel is displayed using the viridis color scheme
- </p></dd>
- <dt>‘<samp class="samp">plasma</samp>’</dt>
- <dd><p>each channel is displayed using the plasma color scheme
- </p></dd>
- <dt>‘<samp class="samp">cividis</samp>’</dt>
- <dd><p>each channel is displayed using the cividis color scheme
- </p></dd>
- <dt>‘<samp class="samp">terrain</samp>’</dt>
- <dd><p>each channel is displayed using the terrain color scheme
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">channel</samp>’.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Specify scale used for calculating intensity color values.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>linear
- </p></dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>square root, default
- </p></dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>cubic root
- </p></dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>logarithmic
- </p></dd>
- <dt>‘<samp class="samp">4thrt</samp>’</dt>
- <dd><p>4th root
- </p></dd>
- <dt>‘<samp class="samp">5thrt</samp>’</dt>
- <dd><p>5th root
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">sqrt</samp>’.
- </p>
- </dd>
- <dt><samp class="option">fscale</samp></dt>
- <dd><p>Specify frequency scale.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>linear
- </p></dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>logarithmic
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">lin</samp>’.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set saturation modifier for displayed colors. Negative values provide
- alternative color scheme. <code class="code">0</code> is no saturation at all.
- Saturation must be in [-10.0, 10.0] range.
- Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hann</samp>’</dt>
- <dt>‘<samp class="samp">hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default value is <code class="code">hann</code>.
- </p>
- </dd>
- <dt><samp class="option">orientation</samp></dt>
- <dd><p>Set orientation of time vs frequency axis. Can be <code class="code">vertical</code> or
- <code class="code">horizontal</code>. Default is <code class="code">vertical</code>.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set ratio of overlap window. Default value is <code class="code">0</code>.
- When value is <code class="code">1</code> overlap is set to recommended size for specific
- window function currently used.
- </p>
- </dd>
- <dt><samp class="option">gain</samp></dt>
- <dd><p>Set scale gain for calculating intensity color values.
- Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">data</samp></dt>
- <dd><p>Set which data to display. Can be <code class="code">magnitude</code>, default or <code class="code">phase</code>,
- or unwrapped phase: <code class="code">uphase</code>.
- </p>
- </dd>
- <dt><samp class="option">rotation</samp></dt>
- <dd><p>Set color rotation, must be in [-1.0, 1.0] range.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">start</samp></dt>
- <dd><p>Set start frequency from which to display spectrogram. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">stop</samp></dt>
- <dd><p>Set stop frequency to which to display spectrogram. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">fps</samp></dt>
- <dd><p>Set upper frame rate limit. Default is <code class="code">auto</code>, unlimited.
- </p>
- </dd>
- <dt><samp class="option">legend</samp></dt>
- <dd><p>Draw time and frequency axes and legends. Default is disabled.
- </p>
- </dd>
- <dt><samp class="option">drange</samp></dt>
- <dd><p>Set dynamic range used to calculate intensity color values. Default is 120 dBFS.
- Allowed range is from 10 to 200.
- </p>
- </dd>
- <dt><samp class="option">limit</samp></dt>
- <dd><p>Set upper limit of input audio samples volume in dBFS. Default is 0 dBFS.
- Allowed range is from -100 to 100.
- </p>
- </dd>
- <dt><samp class="option">opacity</samp></dt>
- <dd><p>Set opacity strength when using pixel format output with alpha component.
- </p></dd>
- </dl>
- <p>The usage is very similar to the showwaves filter; see the examples in that
- section.
- </p>
- <a name="Examples-223"></a>
- <h4 class="subsection">48.26.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-223" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-223" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Large window with logarithmic color scaling:
- <div class="example">
- <pre class="example-preformatted">showspectrum=s=1280x480:scale=log
- </pre></div>
- </li><li>Complete example for a colored and sliding spectrum per channel using <code class="command">ffplay</code>:
- <div class="example">
- <pre class="example-preformatted">ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
- [a] showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt [out0]'
- </pre></div>
- </li></ul>
- <a name="showspectrumpic"></a>
- <h3 class="section">48.27 showspectrumpic<span class="pull-right"><a class="anchor hidden-xs" href="#showspectrumpic" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showspectrumpic" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a single video frame, representing the audio frequency
- spectrum.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">4096x2048</code>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Specify display mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">combined</samp>’</dt>
- <dd><p>all channels are displayed in the same row
- </p></dd>
- <dt>‘<samp class="samp">separate</samp>’</dt>
- <dd><p>all channels are displayed in separate rows
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">combined</samp>’.
- </p>
- </dd>
- <dt><samp class="option">color</samp></dt>
- <dd><p>Specify display color mode.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">channel</samp>’</dt>
- <dd><p>each channel is displayed in a separate color
- </p></dd>
- <dt>‘<samp class="samp">intensity</samp>’</dt>
- <dd><p>each channel is displayed using the same color scheme
- </p></dd>
- <dt>‘<samp class="samp">rainbow</samp>’</dt>
- <dd><p>each channel is displayed using the rainbow color scheme
- </p></dd>
- <dt>‘<samp class="samp">moreland</samp>’</dt>
- <dd><p>each channel is displayed using the moreland color scheme
- </p></dd>
- <dt>‘<samp class="samp">nebulae</samp>’</dt>
- <dd><p>each channel is displayed using the nebulae color scheme
- </p></dd>
- <dt>‘<samp class="samp">fire</samp>’</dt>
- <dd><p>each channel is displayed using the fire color scheme
- </p></dd>
- <dt>‘<samp class="samp">fiery</samp>’</dt>
- <dd><p>each channel is displayed using the fiery color scheme
- </p></dd>
- <dt>‘<samp class="samp">fruit</samp>’</dt>
- <dd><p>each channel is displayed using the fruit color scheme
- </p></dd>
- <dt>‘<samp class="samp">cool</samp>’</dt>
- <dd><p>each channel is displayed using the cool color scheme
- </p></dd>
- <dt>‘<samp class="samp">magma</samp>’</dt>
- <dd><p>each channel is displayed using the magma color scheme
- </p></dd>
- <dt>‘<samp class="samp">green</samp>’</dt>
- <dd><p>each channel is displayed using the green color scheme
- </p></dd>
- <dt>‘<samp class="samp">viridis</samp>’</dt>
- <dd><p>each channel is displayed using the viridis color scheme
- </p></dd>
- <dt>‘<samp class="samp">plasma</samp>’</dt>
- <dd><p>each channel is displayed using the plasma color scheme
- </p></dd>
- <dt>‘<samp class="samp">cividis</samp>’</dt>
- <dd><p>each channel is displayed using the cividis color scheme
- </p></dd>
- <dt>‘<samp class="samp">terrain</samp>’</dt>
- <dd><p>each channel is displayed using the terrain color scheme
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">intensity</samp>’.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Specify scale used for calculating intensity color values.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>linear
- </p></dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>square root, default
- </p></dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>cubic root
- </p></dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>logarithmic
- </p></dd>
- <dt>‘<samp class="samp">4thrt</samp>’</dt>
- <dd><p>4th root
- </p></dd>
- <dt>‘<samp class="samp">5thrt</samp>’</dt>
- <dd><p>5th root
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">log</samp>’.
- </p>
- </dd>
- <dt><samp class="option">fscale</samp></dt>
- <dd><p>Specify frequency scale.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>linear
- </p></dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>logarithmic
- </p></dd>
- </dl>
- <p>Default value is ‘<samp class="samp">lin</samp>’.
- </p>
- </dd>
- <dt><samp class="option">saturation</samp></dt>
- <dd><p>Set saturation modifier for displayed colors. Negative values provide
- alternative color scheme. <code class="code">0</code> is no saturation at all.
- Saturation must be in [-10.0, 10.0] range.
- Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function.
- </p>
- <p>It accepts the following values:
- </p><dl class="table">
- <dt>‘<samp class="samp">rect</samp>’</dt>
- <dt>‘<samp class="samp">bartlett</samp>’</dt>
- <dt>‘<samp class="samp">hann</samp>’</dt>
- <dt>‘<samp class="samp">hanning</samp>’</dt>
- <dt>‘<samp class="samp">hamming</samp>’</dt>
- <dt>‘<samp class="samp">blackman</samp>’</dt>
- <dt>‘<samp class="samp">welch</samp>’</dt>
- <dt>‘<samp class="samp">flattop</samp>’</dt>
- <dt>‘<samp class="samp">bharris</samp>’</dt>
- <dt>‘<samp class="samp">bnuttall</samp>’</dt>
- <dt>‘<samp class="samp">bhann</samp>’</dt>
- <dt>‘<samp class="samp">sine</samp>’</dt>
- <dt>‘<samp class="samp">nuttall</samp>’</dt>
- <dt>‘<samp class="samp">lanczos</samp>’</dt>
- <dt>‘<samp class="samp">gauss</samp>’</dt>
- <dt>‘<samp class="samp">tukey</samp>’</dt>
- <dt>‘<samp class="samp">dolph</samp>’</dt>
- <dt>‘<samp class="samp">cauchy</samp>’</dt>
- <dt>‘<samp class="samp">parzen</samp>’</dt>
- <dt>‘<samp class="samp">poisson</samp>’</dt>
- <dt>‘<samp class="samp">bohman</samp>’</dt>
- <dt>‘<samp class="samp">kaiser</samp>’</dt>
- </dl>
- <p>Default value is <code class="code">hann</code>.
- </p>
- </dd>
- <dt><samp class="option">orientation</samp></dt>
- <dd><p>Set orientation of time vs frequency axis. Can be <code class="code">vertical</code> or
- <code class="code">horizontal</code>. Default is <code class="code">vertical</code>.
- </p>
- </dd>
- <dt><samp class="option">gain</samp></dt>
- <dd><p>Set scale gain for calculating intensity color values.
- Default value is <code class="code">1</code>.
- </p>
- </dd>
- <dt><samp class="option">legend</samp></dt>
- <dd><p>Draw time and frequency axes and legends. Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">rotation</samp></dt>
- <dd><p>Set color rotation, must be in [-1.0, 1.0] range.
- Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">start</samp></dt>
- <dd><p>Set start frequency from which to display spectrogram. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">stop</samp></dt>
- <dd><p>Set stop frequency to which to display spectrogram. Default is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">drange</samp></dt>
- <dd><p>Set dynamic range used to calculate intensity color values. Default is 120 dBFS.
- Allowed range is from 10 to 200.
- </p>
- </dd>
- <dt><samp class="option">limit</samp></dt>
- <dd><p>Set upper limit of input audio samples volume in dBFS. Default is 0 dBFS.
- Allowed range is from -100 to 100.
- </p>
- </dd>
- <dt><samp class="option">opacity</samp></dt>
- <dd><p>Set opacity strength when using pixel format output with alpha component.
- </p></dd>
- </dl>
- <a name="Examples-224"></a>
- <h4 class="subsection">48.27.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-224" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-224" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Extract an audio spectrogram of a whole audio track
- in a 1024x1024 picture using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i audio.flac -lavfi showspectrumpic=s=1024x1024 spectrogram.png
- </pre></div>
- </li></ul>
- <a name="showvolume"></a>
- <h3 class="section">48.28 showvolume<span class="pull-right"><a class="anchor hidden-xs" href="#showvolume" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showvolume" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio volume to a video output.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set video rate.
- </p>
- </dd>
- <dt><samp class="option">b</samp></dt>
- <dd><p>Set border width, allowed range is [0, 5]. Default is 1.
- </p>
- </dd>
- <dt><samp class="option">w</samp></dt>
- <dd><p>Set channel width, allowed range is [80, 8192]. Default is 400.
- </p>
- </dd>
- <dt><samp class="option">h</samp></dt>
- <dd><p>Set channel height, allowed range is [1, 900]. Default is 20.
- </p>
- </dd>
- <dt><samp class="option">f</samp></dt>
- <dd><p>Set fade, allowed range is [0, 1]. Default is 0.95.
- </p>
- </dd>
- <dt><samp class="option">c</samp></dt>
- <dd><p>Set volume color expression.
- </p>
- <p>The expression can use the following variables:
- </p>
- <dl class="table">
- <dt><samp class="option">VOLUME</samp></dt>
- <dd><p>Current max volume of channel in dB.
- </p>
- </dd>
- <dt><samp class="option">PEAK</samp></dt>
- <dd><p>Current peak.
- </p>
- </dd>
- <dt><samp class="option">CHANNEL</samp></dt>
- <dd><p>Current channel number, starting from 0.
- </p></dd>
- </dl>
- </dd>
- <dt><samp class="option">t</samp></dt>
- <dd><p>If set, displays channel names. Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">v</samp></dt>
- <dd><p>If set, displays volume values. Default is enabled.
- </p>
- </dd>
- <dt><samp class="option">o</samp></dt>
- <dd><p>Set orientation, can be horizontal: <code class="code">h</code> or vertical: <code class="code">v</code>,
- default is <code class="code">h</code>.
- </p>
- </dd>
- <dt><samp class="option">s</samp></dt>
- <dd><p>Set step size, allowed range is [0, 5]. Default is 0, which means
- step is disabled.
- </p>
- </dd>
- <dt><samp class="option">p</samp></dt>
- <dd><p>Set background opacity, allowed range is [0, 1]. Default is 0.
- </p>
- </dd>
- <dt><samp class="option">m</samp></dt>
- <dd><p>Set metering mode, can be peak: <code class="code">p</code> or rms: <code class="code">r</code>,
- default is <code class="code">p</code>.
- </p>
- </dd>
- <dt><samp class="option">ds</samp></dt>
- <dd><p>Set display scale, can be linear: <code class="code">lin</code> or log: <code class="code">log</code>,
- default is <code class="code">lin</code>.
- </p>
- </dd>
- <dt><samp class="option">dm</samp></dt>
- <dd><p>In second.
- If set to > 0., display a line for the max level
- in the previous seconds.
- default is disabled: <code class="code">0.</code>
- </p>
- </dd>
- <dt><samp class="option">dmc</samp></dt>
- <dd><p>The color of the max line. Use when <code class="code">dm</code> option is set to > 0.
- default is: <code class="code">orange</code>
- </p></dd>
- </dl>
- <a name="showwaves"></a>
- <h3 class="section">48.29 showwaves<span class="pull-right"><a class="anchor hidden-xs" href="#showwaves" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showwaves" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a video output, representing the samples waves.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">600x240</code>.
- </p>
- </dd>
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set display mode.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">point</samp>’</dt>
- <dd><p>Draw a point for each sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">line</samp>’</dt>
- <dd><p>Draw a vertical line for each sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">p2p</samp>’</dt>
- <dd><p>Draw a point for each sample and a line between them.
- </p>
- </dd>
- <dt>‘<samp class="samp">cline</samp>’</dt>
- <dd><p>Draw a centered vertical line for each sample.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">point</code>.
- </p>
- </dd>
- <dt><samp class="option">n</samp></dt>
- <dd><p>Set the number of samples which are printed on the same column. A
- larger value will decrease the frame rate. Must be a positive
- integer. This option can be set only if the value for <var class="var">rate</var>
- is not explicitly specified.
- </p>
- </dd>
- <dt><samp class="option">rate, r</samp></dt>
- <dd><p>Set the (approximate) output frame rate. This is done by setting the
- option <var class="var">n</var>. Default value is "25".
- </p>
- </dd>
- <dt><samp class="option">split_channels</samp></dt>
- <dd><p>Set if channels should be drawn separately or overlap. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">colors</samp></dt>
- <dd><p>Set colors separated by ’|’ which are going to be used for drawing of each channel.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set amplitude scale.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>Linear.
- </p>
- </dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>Logarithmic.
- </p>
- </dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>Square root.
- </p>
- </dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>Cubic root.
- </p></dd>
- </dl>
- <p>Default is linear.
- </p>
- </dd>
- <dt><samp class="option">draw</samp></dt>
- <dd><p>Set the draw mode. This is mostly useful to set for high <var class="var">n</var>.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">scale</samp>’</dt>
- <dd><p>Scale pixel values for each drawn sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>Draw every sample directly.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">scale</code>.
- </p></dd>
- </dl>
- <a name="Examples-225"></a>
- <h4 class="subsection">48.29.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-225" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-225" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Output the input file audio and the corresponding video representation
- at the same time:
- <div class="example">
- <pre class="example-preformatted">amovie=a.mp3,asplit[out0],showwaves[out1]
- </pre></div>
- </li><li>Create a synthetic signal and show it with showwaves, forcing a
- frame rate of 30 frames per second:
- <div class="example">
- <pre class="example-preformatted">aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t):cos(2*PI*200*t),asplit[out0],showwaves=r=30[out1]
- </pre></div>
- </li></ul>
- <a name="showwavespic"></a>
- <h3 class="section">48.30 showwavespic<span class="pull-right"><a class="anchor hidden-xs" href="#showwavespic" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-showwavespic" aria-hidden="true">TOC</a></span></h3>
- <p>Convert input audio to a single video frame, representing the samples waves.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Specify the video size for the output. For the syntax of this option, check the
- <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#video-size-syntax">"Video size" section in the ffmpeg-utils manual</a>.
- Default value is <code class="code">600x240</code>.
- </p>
- </dd>
- <dt><samp class="option">split_channels</samp></dt>
- <dd><p>Set if channels should be drawn separately or overlap. Default value is 0.
- </p>
- </dd>
- <dt><samp class="option">colors</samp></dt>
- <dd><p>Set colors separated by ’|’ which are going to be used for drawing of each channel.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set amplitude scale.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">lin</samp>’</dt>
- <dd><p>Linear.
- </p>
- </dd>
- <dt>‘<samp class="samp">log</samp>’</dt>
- <dd><p>Logarithmic.
- </p>
- </dd>
- <dt>‘<samp class="samp">sqrt</samp>’</dt>
- <dd><p>Square root.
- </p>
- </dd>
- <dt>‘<samp class="samp">cbrt</samp>’</dt>
- <dd><p>Cubic root.
- </p></dd>
- </dl>
- <p>Default is linear.
- </p>
- </dd>
- <dt><samp class="option">draw</samp></dt>
- <dd><p>Set the draw mode.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">scale</samp>’</dt>
- <dd><p>Scale pixel values for each drawn sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">full</samp>’</dt>
- <dd><p>Draw every sample directly.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">scale</code>.
- </p>
- </dd>
- <dt><samp class="option">filter</samp></dt>
- <dd><p>Set the filter mode.
- </p>
- <p>Available values are:
- </p><dl class="table">
- <dt>‘<samp class="samp">average</samp>’</dt>
- <dd><p>Use average samples values for each drawn sample.
- </p>
- </dd>
- <dt>‘<samp class="samp">peak</samp>’</dt>
- <dd><p>Use peak samples values for each drawn sample.
- </p></dd>
- </dl>
- <p>Default value is <code class="code">average</code>.
- </p></dd>
- </dl>
- <a name="Examples-226"></a>
- <h4 class="subsection">48.30.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-226" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-226" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Extract a channel split representation of the wave form of a whole audio track
- in a 1024x800 picture using <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i audio.flac -lavfi showwavespic=split_channels=1:s=1024x800 waveform.png
- </pre></div>
- </li></ul>
- <a name="sidedata_002c-asidedata"></a>
- <h3 class="section">48.31 sidedata, asidedata<span class="pull-right"><a class="anchor hidden-xs" href="#sidedata_002c-asidedata" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sidedata_002c-asidedata" aria-hidden="true">TOC</a></span></h3>
- <p>Delete frame side data, or select frames based on it.
- </p>
- <p>This filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">mode</samp></dt>
- <dd><p>Set mode of operation of the filter.
- </p>
- <p>Can be one of the following:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">select</samp>’</dt>
- <dd><p>Select every frame with side data of <code class="code">type</code>.
- </p>
- </dd>
- <dt>‘<samp class="samp">delete</samp>’</dt>
- <dd><p>Delete side data of <code class="code">type</code>. If <code class="code">type</code> is not set, delete all side
- data in the frame.
- </p>
- </dd>
- </dl>
- </dd>
- <dt><samp class="option">type</samp></dt>
- <dd><p>Set side data type used with all modes. Must be set for <code class="code">select</code> mode.
- </p>
- <p>Possible values are:
- </p>
- <dl class="table">
- <dt>‘<samp class="samp">PANSCAN</samp>’</dt>
- <dt>‘<samp class="samp">A53_CC</samp>’</dt>
- <dt>‘<samp class="samp">STEREO3D</samp>’</dt>
- <dt>‘<samp class="samp">MATRIXENCODING</samp>’</dt>
- <dt>‘<samp class="samp">DOWNMIX_INFO</samp>’</dt>
- <dt>‘<samp class="samp">REPLAYGAIN</samp>’</dt>
- <dt>‘<samp class="samp">DISPLAYMATRIX</samp>’</dt>
- <dt>‘<samp class="samp">AFD</samp>’</dt>
- <dt>‘<samp class="samp">MOTION_VECTORS</samp>’</dt>
- <dt>‘<samp class="samp">SKIP_SAMPLES</samp>’</dt>
- <dt>‘<samp class="samp">AUDIO_SERVICE_TYPE</samp>’</dt>
- <dt>‘<samp class="samp">MASTERING_DISPLAY_METADATA</samp>’</dt>
- <dt>‘<samp class="samp">GOP_TIMECODE</samp>’</dt>
- <dt>‘<samp class="samp">SPHERICAL</samp>’</dt>
- <dt>‘<samp class="samp">CONTENT_LIGHT_LEVEL</samp>’</dt>
- <dt>‘<samp class="samp">ICC_PROFILE</samp>’</dt>
- <dt>‘<samp class="samp">S12M_TIMECODE</samp>’</dt>
- <dt>‘<samp class="samp">DYNAMIC_HDR_PLUS</samp>’</dt>
- <dt>‘<samp class="samp">REGIONS_OF_INTEREST</samp>’</dt>
- <dt>‘<samp class="samp">VIDEO_ENC_PARAMS</samp>’</dt>
- <dt>‘<samp class="samp">SEI_UNREGISTERED</samp>’</dt>
- <dt>‘<samp class="samp">FILM_GRAIN_PARAMS</samp>’</dt>
- <dt>‘<samp class="samp">DETECTION_BOUNDING_BOXES</samp>’</dt>
- <dt>‘<samp class="samp">DETECTION_BBOXES</samp>’</dt>
- <dt>‘<samp class="samp">DOVI_RPU_BUFFER</samp>’</dt>
- <dt>‘<samp class="samp">DOVI_METADATA</samp>’</dt>
- <dt>‘<samp class="samp">DYNAMIC_HDR_VIVID</samp>’</dt>
- <dt>‘<samp class="samp">AMBIENT_VIEWING_ENVIRONMENT</samp>’</dt>
- <dt>‘<samp class="samp">VIDEO_HINT</samp>’</dt>
- </dl>
- </dd>
- </dl>
- <a name="spectrumsynth"></a>
- <h3 class="section">48.32 spectrumsynth<span class="pull-right"><a class="anchor hidden-xs" href="#spectrumsynth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-spectrumsynth" aria-hidden="true">TOC</a></span></h3>
- <p>Synthesize audio from 2 input video spectrums, first input stream represents
- magnitude across time and second represents phase across time.
- The filter will transform from frequency domain as displayed in videos back
- to time domain as presented in audio output.
- </p>
- <p>This filter is primarily created for reversing processed <a class="ref" href="#showspectrum">showspectrum</a>
- filter outputs, but can synthesize sound from other spectrograms too.
- But in such case results are going to be poor if the phase data is not
- available, because in such cases phase data need to be recreated, usually
- it’s just recreated from random noise.
- For best results use gray only output (<code class="code">channel</code> color mode in
- <a class="ref" href="#showspectrum">showspectrum</a> filter) and <code class="code">log</code> scale for magnitude video and
- <code class="code">lin</code> scale for phase video. To produce phase, for 2nd video, use
- <code class="code">data</code> option. Inputs videos should generally use <code class="code">fullframe</code>
- slide mode as that saves resources needed for decoding video.
- </p>
- <p>The filter accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">sample_rate</samp></dt>
- <dd><p>Specify sample rate of output audio, the sample rate of audio from which
- spectrum was generated may differ.
- </p>
- </dd>
- <dt><samp class="option">channels</samp></dt>
- <dd><p>Set number of channels represented in input video spectrums.
- </p>
- </dd>
- <dt><samp class="option">scale</samp></dt>
- <dd><p>Set scale which was used when generating magnitude input spectrum.
- Can be <code class="code">lin</code> or <code class="code">log</code>. Default is <code class="code">log</code>.
- </p>
- </dd>
- <dt><samp class="option">slide</samp></dt>
- <dd><p>Set slide which was used when generating inputs spectrums.
- Can be <code class="code">replace</code>, <code class="code">scroll</code>, <code class="code">fullframe</code> or <code class="code">rscroll</code>.
- Default is <code class="code">fullframe</code>.
- </p>
- </dd>
- <dt><samp class="option">win_func</samp></dt>
- <dd><p>Set window function used for resynthesis.
- </p>
- </dd>
- <dt><samp class="option">overlap</samp></dt>
- <dd><p>Set window overlap. In range <code class="code">[0, 1]</code>. Default is <code class="code">1</code>,
- which means optimal overlap for selected window function will be picked.
- </p>
- </dd>
- <dt><samp class="option">orientation</samp></dt>
- <dd><p>Set orientation of input videos. Can be <code class="code">vertical</code> or <code class="code">horizontal</code>.
- Default is <code class="code">vertical</code>.
- </p></dd>
- </dl>
- <a name="Examples-227"></a>
- <h4 class="subsection">48.32.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-227" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-227" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>First create magnitude and phase videos from audio, assuming audio is stereo with 44100 sample rate,
- then resynthesize videos back to audio with spectrumsynth:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i input.flac -lavfi showspectrum=mode=separate:scale=log:overlap=0.875:color=channel:slide=fullframe:data=magnitude -an -c:v rawvideo magnitude.nut
- ffmpeg -i input.flac -lavfi showspectrum=mode=separate:scale=lin:overlap=0.875:color=channel:slide=fullframe:data=phase -an -c:v rawvideo phase.nut
- ffmpeg -i magnitude.nut -i phase.nut -lavfi spectrumsynth=channels=2:sample_rate=44100:win_func=hann:overlap=0.875:slide=fullframe output.flac
- </pre></div>
- </li></ul>
- <a name="split_002c-asplit"></a>
- <h3 class="section">48.33 split, asplit<span class="pull-right"><a class="anchor hidden-xs" href="#split_002c-asplit" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-split_002c-asplit" aria-hidden="true">TOC</a></span></h3>
- <p>Split input into several identical outputs.
- </p>
- <p><code class="code">asplit</code> works with audio input, <code class="code">split</code> with video.
- </p>
- <p>The filter accepts a single parameter which specifies the number of outputs. If
- unspecified, it defaults to 2.
- </p>
- <a name="Examples-228"></a>
- <h4 class="subsection">48.33.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-228" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-228" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Create two separate outputs from the same input:
- <div class="example">
- <pre class="example-preformatted">[in] split [out0][out1]
- </pre></div>
- </li><li>To create 3 or more outputs, you need to specify the number of
- outputs, like in:
- <div class="example">
- <pre class="example-preformatted">[in] asplit=3 [out0][out1][out2]
- </pre></div>
- </li><li>Create two separate outputs from the same input, one cropped and
- one padded:
- <div class="example">
- <pre class="example-preformatted">[in] split [splitout1][splitout2];
- [splitout1] crop=100:100:0:0 [cropout];
- [splitout2] pad=200:200:100:100 [padout];
- </pre></div>
- </li><li>Create 5 copies of the input audio with <code class="command">ffmpeg</code>:
- <div class="example">
- <pre class="example-preformatted">ffmpeg -i INPUT -filter_complex asplit=5 OUTPUT
- </pre></div>
- </li></ul>
- <a name="zmq_002c-azmq"></a>
- <h3 class="section">48.34 zmq, azmq<span class="pull-right"><a class="anchor hidden-xs" href="#zmq_002c-azmq" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-zmq_002c-azmq" aria-hidden="true">TOC</a></span></h3>
- <p>Receive commands sent through a libzmq client, and forward them to
- filters in the filtergraph.
- </p>
- <p><code class="code">zmq</code> and <code class="code">azmq</code> work as a pass-through filters. <code class="code">zmq</code>
- must be inserted between two video filters, <code class="code">azmq</code> between two
- audio filters. Both are capable to send messages to any filter type.
- </p>
- <p>To enable these filters you need to install the libzmq library and
- headers and configure FFmpeg with <code class="code">--enable-libzmq</code>.
- </p>
- <p>For more information about libzmq see:
- <a class="url" href="http://www.zeromq.org/">http://www.zeromq.org/</a>
- </p>
- <p>The <code class="code">zmq</code> and <code class="code">azmq</code> filters work as a libzmq server, which
- receives messages sent through a network interface defined by the
- <samp class="option">bind_address</samp> (or the abbreviation "<samp class="option">b</samp>") option.
- Default value of this option is <samp class="file">tcp://localhost:5555</samp>. You may
- want to alter this value to your needs, but do not forget to escape any
- ’:’ signs (see <a class="ref" href="#filtergraph-escaping">filtergraph escaping</a>).
- </p>
- <p>The received message must be in the form:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">TARGET</var> <var class="var">COMMAND</var> [<var class="var">ARG</var>]
- </pre></div>
- <p><var class="var">TARGET</var> specifies the target of the command, usually the name of
- the filter class or a specific filter instance name. The default
- filter instance name uses the pattern ‘<samp class="samp">Parsed_<filter_name>_<index></samp>’,
- but you can override this by using the ‘<samp class="samp">filter_name@id</samp>’ syntax
- (see <a class="ref" href="#Filtergraph-syntax">Filtergraph syntax</a>).
- </p>
- <p><var class="var">COMMAND</var> specifies the name of the command for the target filter.
- </p>
- <p><var class="var">ARG</var> is optional and specifies the optional argument list for the
- given <var class="var">COMMAND</var>.
- </p>
- <p>Upon reception, the message is processed and the corresponding command
- is injected into the filtergraph. Depending on the result, the filter
- will send a reply to the client, adopting the format:
- </p><div class="example">
- <pre class="example-preformatted"><var class="var">ERROR_CODE</var> <var class="var">ERROR_REASON</var>
- <var class="var">MESSAGE</var>
- </pre></div>
- <p><var class="var">MESSAGE</var> is optional.
- </p>
- <a name="Examples-229"></a>
- <h4 class="subsection">48.34.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-229" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-229" aria-hidden="true">TOC</a></span></h4>
- <p>Look at <samp class="file">tools/zmqsend</samp> for an example of a zmq client which can
- be used to send commands processed by these filters.
- </p>
- <p>Consider the following filtergraph generated by <code class="command">ffplay</code>.
- In this example the last overlay filter has an instance name. All other
- filters will have default instance names.
- </p>
- <div class="example">
- <pre class="example-preformatted">ffplay -dumpgraph 1 -f lavfi "
- color=s=100x100:c=red [l];
- color=s=100x100:c=blue [r];
- nullsrc=s=200x100, zmq [bg];
- [bg][l] overlay [bg+l];
- [bg+l][r] overlay@my=x=100 "
- </pre></div>
- <p>To change the color of the left side of the video, the following
- command can be used:
- </p><div class="example">
- <pre class="example-preformatted">echo Parsed_color_0 c yellow | tools/zmqsend
- </pre></div>
- <p>To change the right side:
- </p><div class="example">
- <pre class="example-preformatted">echo Parsed_color_1 c pink | tools/zmqsend
- </pre></div>
- <p>To change the position of the right side:
- </p><div class="example">
- <pre class="example-preformatted">echo overlay@my x 150 | tools/zmqsend
- </pre></div>
- <a name="Multimedia-Sources"></a>
- <h2 class="chapter">49 Multimedia Sources<span class="pull-right"><a class="anchor hidden-xs" href="#Multimedia-Sources" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Multimedia-Sources" aria-hidden="true">TOC</a></span></h2>
- <p>Below is a description of the currently available multimedia sources.
- </p>
- <a name="amovie"></a>
- <h3 class="section">49.1 amovie<span class="pull-right"><a class="anchor hidden-xs" href="#amovie" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-amovie" aria-hidden="true">TOC</a></span></h3>
- <p>This is the same as <a class="ref" href="#movie">movie</a> source, except it selects an audio
- stream by default.
- </p>
- <a name="avsynctest"></a>
- <h3 class="section">49.2 avsynctest<span class="pull-right"><a class="anchor hidden-xs" href="#avsynctest" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avsynctest" aria-hidden="true">TOC</a></span></h3>
- <p>Generate an Audio/Video Sync Test.
- </p>
- <p>Generated stream periodically shows flash video frame and emits beep in audio.
- Useful to inspect A/V sync issues.
- </p>
- <p>It accepts the following options:
- </p>
- <dl class="table">
- <dt><samp class="option">size, s</samp></dt>
- <dd><p>Set output video size. Default value is <code class="code">hd720</code>.
- </p>
- </dd>
- <dt><samp class="option">framerate, fr</samp></dt>
- <dd><p>Set output video frame rate. Default value is <code class="code">30</code>.
- </p>
- </dd>
- <dt><samp class="option">samplerate, sr</samp></dt>
- <dd><p>Set output audio sample rate. Default value is <code class="code">44100</code>.
- </p>
- </dd>
- <dt><samp class="option">amplitude, a</samp></dt>
- <dd><p>Set output audio beep amplitude. Default value is <code class="code">0.7</code>.
- </p>
- </dd>
- <dt><samp class="option">period, p</samp></dt>
- <dd><p>Set output audio beep period in seconds. Default value is <code class="code">3</code>.
- </p>
- </dd>
- <dt><samp class="option">delay, dl</samp></dt>
- <dd><p>Set output video flash delay in number of frames. Default value is <code class="code">0</code>.
- </p>
- </dd>
- <dt><samp class="option">cycle, c</samp></dt>
- <dd><p>Enable cycling of video delays, by default is disabled.
- </p>
- </dd>
- <dt><samp class="option">duration, d</samp></dt>
- <dd><p>Set stream output duration. By default duration is unlimited.
- </p>
- </dd>
- <dt><samp class="option">fg, bg, ag</samp></dt>
- <dd><p>Set foreground/background/additional color.
- </p></dd>
- </dl>
- <a name="Commands-164"></a>
- <h4 class="subsection">49.2.1 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-164" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-164" aria-hidden="true">TOC</a></span></h4>
- <p>This source supports the some above options as <a class="ref" href="#commands">commands</a>.
- </p>
- <a class="anchor" id="movie"></a><a name="movie-1"></a>
- <h3 class="section">49.3 movie<span class="pull-right"><a class="anchor hidden-xs" href="#movie-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-movie-1" aria-hidden="true">TOC</a></span></h3>
- <p>Read audio and/or video stream(s) from a movie container.
- </p>
- <p>It accepts the following parameters:
- </p>
- <dl class="table">
- <dt><samp class="option">filename</samp></dt>
- <dd><p>The name of the resource to read (not necessarily a file; it can also be a
- device or a stream accessed through some protocol).
- </p>
- </dd>
- <dt><samp class="option">format_name, f</samp></dt>
- <dd><p>Specifies the format assumed for the movie to read, and can be either
- the name of a container or an input device. If not specified, the
- format is guessed from <var class="var">movie_name</var> or by probing.
- </p>
- </dd>
- <dt><samp class="option">seek_point, sp</samp></dt>
- <dd><p>Specifies the seek point in seconds. The frames will be output
- starting from this seek point. The parameter is evaluated with
- <code class="code">av_strtod</code>, so the numerical value may be suffixed by an IS
- postfix. The default value is "0".
- </p>
- </dd>
- <dt><samp class="option">streams, s</samp></dt>
- <dd><p>Specifies the streams to read. Several streams can be specified,
- separated by "+". The source will then have as many outputs, in the
- same order. The syntax is explained in the <a data-manual="ffmpeg" href="ffmpeg.html#Stream-specifiers">"Stream specifiers"
- section in the ffmpeg manual</a>. Two special names, "dv" and "da" specify
- respectively the default (best suited) video and audio stream. Default
- is "dv", or "da" if the filter is called as "amovie".
- </p>
- </dd>
- <dt><samp class="option">stream_index, si</samp></dt>
- <dd><p>Specifies the index of the video stream to read. If the value is -1,
- the most suitable video stream will be automatically selected. The default
- value is "-1". Deprecated. If the filter is called "amovie", it will select
- audio instead of video.
- </p>
- </dd>
- <dt><samp class="option">loop</samp></dt>
- <dd><p>Specifies how many times to read the stream in sequence.
- If the value is 0, the stream will be looped infinitely.
- Default value is "1".
- </p>
- <p>Note that when the movie is looped the source timestamps are not
- changed, so it will generate non monotonically increasing timestamps.
- </p>
- </dd>
- <dt><samp class="option">discontinuity</samp></dt>
- <dd><p>Specifies the time difference between frames above which the point is
- considered a timestamp discontinuity which is removed by adjusting the later
- timestamps.
- </p>
- </dd>
- <dt><samp class="option">dec_threads</samp></dt>
- <dd><p>Specifies the number of threads for decoding
- </p>
- </dd>
- <dt><samp class="option">format_opts</samp></dt>
- <dd><p>Specify format options for the opened file. Format options can be specified
- as a list of <var class="var">key</var>=<var class="var">value</var> pairs separated by ’:’. The following example
- shows how to add protocol_whitelist and protocol_blacklist options:
- </p><div class="example">
- <pre class="example-preformatted">ffplay -f lavfi
- "movie=filename='1.sdp':format_opts='protocol_whitelist=file,rtp,udp\:protocol_blacklist=http'"
- </pre></div>
- </dd>
- </dl>
- <p>It allows overlaying a second video on top of the main input of
- a filtergraph, as shown in this graph:
- </p><div class="example">
- <pre class="example-preformatted">input -----------> deltapts0 --> overlay --> output
- ^
- |
- movie --> scale--> deltapts1 -------+
- </pre></div>
- <a name="Examples-230"></a>
- <h4 class="subsection">49.3.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-230" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-230" aria-hidden="true">TOC</a></span></h4>
- <ul class="itemize mark-bullet">
- <li>Skip 3.2 seconds from the start of the AVI file in.avi, and overlay it
- on top of the input labelled "in":
- <div class="example">
- <pre class="example-preformatted">movie=in.avi:seek_point=3.2, scale=180:-1, setpts=PTS-STARTPTS [over];
- [in] setpts=PTS-STARTPTS [main];
- [main][over] overlay=16:16 [out]
- </pre></div>
- </li><li>Read from a video4linux2 device, and overlay it on top of the input
- labelled "in":
- <div class="example">
- <pre class="example-preformatted">movie=/dev/video0:f=video4linux2, scale=180:-1, setpts=PTS-STARTPTS [over];
- [in] setpts=PTS-STARTPTS [main];
- [main][over] overlay=16:16 [out]
- </pre></div>
- </li><li>Read the first video stream and the audio stream with id 0x81 from
- dvd.vob; the video is connected to the pad named "video" and the audio is
- connected to the pad named "audio":
- <div class="example">
- <pre class="example-preformatted">movie=dvd.vob:s=v:0+#0x81 [video] [audio]
- </pre></div>
- </li></ul>
- <a name="Commands-165"></a>
- <h4 class="subsection">49.3.2 Commands<span class="pull-right"><a class="anchor hidden-xs" href="#Commands-165" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Commands-165" aria-hidden="true">TOC</a></span></h4>
- <p>Both movie and amovie support the following commands:
- </p><dl class="table">
- <dt><samp class="option">seek</samp></dt>
- <dd><p>Perform seek using "av_seek_frame".
- The syntax is: seek <var class="var">stream_index</var>|<var class="var">timestamp</var>|<var class="var">flags</var>
- </p><ul class="itemize mark-bullet">
- <li><var class="var">stream_index</var>: If stream_index is -1, a default
- stream is selected, and <var class="var">timestamp</var> is automatically converted
- from AV_TIME_BASE units to the stream specific time_base.
- </li><li><var class="var">timestamp</var>: Timestamp in AVStream.time_base units
- or, if no stream is specified, in AV_TIME_BASE units.
- </li><li><var class="var">flags</var>: Flags which select direction and seeking mode.
- </li></ul>
- </dd>
- <dt><samp class="option">get_duration</samp></dt>
- <dd><p>Get movie duration in AV_TIME_BASE units.
- </p>
- </dd>
- </dl>
- <a name="External-libraries"></a>
- <h2 class="chapter">50 External libraries<span class="pull-right"><a class="anchor hidden-xs" href="#External-libraries" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-External-libraries" aria-hidden="true">TOC</a></span></h2>
- <p>FFmpeg can be hooked up with a number of external libraries to add support
- for more formats. None of them are used by default, their use has to be
- explicitly requested by passing the appropriate flags to
- <code class="command">./configure</code>.
- </p>
- <a name="Alliance-for-Open-Media-_0028AOM_0029"></a>
- <h3 class="section">50.1 Alliance for Open Media (AOM)<span class="pull-right"><a class="anchor hidden-xs" href="#Alliance-for-Open-Media-_0028AOM_0029" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Alliance-for-Open-Media-_0028AOM_0029" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the AOM library for AV1 decoding and encoding.
- </p>
- <p>Go to <a class="url" href="http://aomedia.org/">http://aomedia.org/</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libaom</code> to configure to
- enable it.
- </p>
- <a name="AMD-AMF_002fVCE"></a>
- <h3 class="section">50.2 AMD AMF/VCE<span class="pull-right"><a class="anchor hidden-xs" href="#AMD-AMF_002fVCE" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AMD-AMF_002fVCE" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can use the AMD Advanced Media Framework library
- for accelerated H.264 and HEVC(only windows) encoding on hardware with Video Coding Engine (VCE).
- </p>
- <p>To enable support you must obtain the AMF framework header files(version 1.4.9+) from
- <a class="url" href="https://github.com/GPUOpen-LibrariesAndSDKs/AMF.git">https://github.com/GPUOpen-LibrariesAndSDKs/AMF.git</a>.
- </p>
- <p>Create an <code class="code">AMF/</code> directory in the system include path.
- Copy the contents of <code class="code">AMF/amf/public/include/</code> into that directory.
- Then configure FFmpeg with <code class="code">--enable-amf</code>.
- </p>
- <p>Initialization of amf encoder occurs in this order:
- 1) trying to initialize through dx11(only windows)
- 2) trying to initialize through dx9(only windows)
- 3) trying to initialize through vulkan
- </p>
- <p>To use h.264(AMD VCE) encoder on linux amdgru-pro version 19.20+ and amf-amdgpu-pro
- package(amdgru-pro contains, but does not install automatically) are required.
- </p>
- <p>This driver can be installed using amdgpu-pro-install script in official amd driver archive.
- </p>
- <a name="AviSynth"></a>
- <h3 class="section">50.3 AviSynth<span class="pull-right"><a class="anchor hidden-xs" href="#AviSynth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AviSynth" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can read AviSynth scripts as input. To enable support, pass
- <code class="code">--enable-avisynth</code> to configure after installing the headers
- provided by <a class="url" href="https://github.com/AviSynth/AviSynthPlus">AviSynth+</a>.
- AviSynth+ can be configured to install only the headers by either
- passing <code class="code">-DHEADERS_ONLY:bool=on</code> to the normal CMake-based build
- system, or by using the supplied <code class="code">GNUmakefile</code>.
- </p>
- <p>For Windows, supported AviSynth variants are
- <a class="url" href="http://avisynth.nl">AviSynth 2.6 RC1 or higher</a> for 32-bit builds and
- <a class="url" href="http://avisynth.nl/index.php/AviSynth+">AviSynth+ r1718 or higher</a> for 32-bit and 64-bit builds.
- </p>
- <p>For Linux, macOS, and BSD, the only supported AviSynth variant is
- <a class="url" href="https://github.com/AviSynth/AviSynthPlus">AviSynth+</a>, starting with version 3.5.
- </p>
- <div class="info">
- <p>In 2016, AviSynth+ added support for building with GCC. However, due to
- the eccentricities of Windows’ calling conventions, 32-bit GCC builds
- of AviSynth+ are not compatible with typical 32-bit builds of FFmpeg.
- </p>
- <p>By default, FFmpeg assumes compatibility with 32-bit MSVC builds of
- AviSynth+ since that is the most widely-used and entrenched build
- configuration. Users can override this and enable support for 32-bit
- GCC builds of AviSynth+ by passing <code class="code">-DAVSC_WIN32_GCC32</code> to
- <code class="code">--extra-cflags</code> when configuring FFmpeg.
- </p>
- <p>64-bit builds of FFmpeg are not affected, and can use either MSVC or
- GCC builds of AviSynth+ without any special flags.
- </p></div>
- <div class="info">
- <p>AviSynth(+) is loaded dynamically. Distributors can build FFmpeg
- with <code class="code">--enable-avisynth</code>, and the binaries will work regardless
- of the end user having AviSynth installed. If/when an end user
- would like to use AviSynth scripts, then they can install AviSynth(+)
- and FFmpeg will be able to find and use it to open scripts.
- </p></div>
- <a name="Chromaprint"></a>
- <h3 class="section">50.4 Chromaprint<span class="pull-right"><a class="anchor hidden-xs" href="#Chromaprint" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Chromaprint" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the Chromaprint library for generating audio fingerprints.
- Pass <code class="code">--enable-chromaprint</code> to configure to
- enable it. See <a class="url" href="https://acoustid.org/chromaprint">https://acoustid.org/chromaprint</a>.
- </p>
- <a name="codec2-1"></a>
- <h3 class="section">50.5 codec2<span class="pull-right"><a class="anchor hidden-xs" href="#codec2-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-codec2-1" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the codec2 library for codec2 decoding and encoding.
- There is currently no native decoder, so libcodec2 must be used for decoding.
- </p>
- <p>Go to <a class="url" href="http://freedv.org/">http://freedv.org/</a>, download "Codec 2 source archive".
- Build and install using CMake. Debian users can install the libcodec2-dev package instead.
- Once libcodec2 is installed you can pass <code class="code">--enable-libcodec2</code> to configure to enable it.
- </p>
- <p>The easiest way to use codec2 is with .c2 files, since they contain the mode information required for decoding.
- To encode such a file, use a .c2 file extension and give the libcodec2 encoder the -mode option:
- <code class="code">ffmpeg -i input.wav -mode 700C output.c2</code>.
- Playback is as simple as <code class="code">ffplay output.c2</code>.
- For a list of supported modes, run <code class="code">ffmpeg -h encoder=libcodec2</code>.
- Raw codec2 files are also supported.
- To make sense of them the mode in use needs to be specified as a format option:
- <code class="code">ffmpeg -f codec2raw -mode 1300 -i input.raw output.wav</code>.
- </p>
- <a name="dav1d"></a>
- <h3 class="section">50.6 dav1d<span class="pull-right"><a class="anchor hidden-xs" href="#dav1d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dav1d" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the dav1d library for AV1 video decoding.
- </p>
- <p>Go to <a class="url" href="https://code.videolan.org/videolan/dav1d">https://code.videolan.org/videolan/dav1d</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libdav1d</code> to configure to enable it.
- </p>
- <a name="davs2"></a>
- <h3 class="section">50.7 davs2<span class="pull-right"><a class="anchor hidden-xs" href="#davs2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-davs2" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the davs2 library for AVS2-P2/IEEE1857.4 video decoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/pkuvcl/davs2">https://github.com/pkuvcl/davs2</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libdavs2</code> to configure to
- enable it.
- </p>
- <div class="info">
- <p>libdavs2 is under the GNU Public License Version 2 or later
- (see <a class="url" href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html">http://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a> for
- details), you must upgrade FFmpeg’s license to GPL in order to use it.
- </p></div>
- <a name="uavs3d"></a>
- <h3 class="section">50.8 uavs3d<span class="pull-right"><a class="anchor hidden-xs" href="#uavs3d" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-uavs3d" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the uavs3d library for AVS3-P2/IEEE1857.10 video decoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/uavs3/uavs3d">https://github.com/uavs3/uavs3d</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libuavs3d</code> to configure to
- enable it.
- </p>
- <a name="Game-Music-Emu"></a>
- <h3 class="section">50.9 Game Music Emu<span class="pull-right"><a class="anchor hidden-xs" href="#Game-Music-Emu" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Game-Music-Emu" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the Game Music Emu library to read audio from supported video game
- music file formats. Pass <code class="code">--enable-libgme</code> to configure to
- enable it. See <a class="url" href="https://bitbucket.org/mpyne/game-music-emu/overview">https://bitbucket.org/mpyne/game-music-emu/overview</a>.
- </p>
- <a name="Intel-QuickSync-Video"></a>
- <h3 class="section">50.10 Intel QuickSync Video<span class="pull-right"><a class="anchor hidden-xs" href="#Intel-QuickSync-Video" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Intel-QuickSync-Video" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can use Intel QuickSync Video (QSV) for accelerated decoding and encoding
- of multiple codecs. To use QSV, FFmpeg must be linked against the <code class="code">libmfx</code>
- dispatcher, which loads the actual decoding libraries.
- </p>
- <p>The dispatcher is open source and can be downloaded from
- <a class="url" href="https://github.com/lu-zero/mfx_dispatch.git">https://github.com/lu-zero/mfx_dispatch.git</a>. FFmpeg needs to be configured
- with the <code class="code">--enable-libmfx</code> option and <code class="code">pkg-config</code> needs to be able to
- locate the dispatcher’s <code class="code">.pc</code> files.
- </p>
- <a name="Kvazaar"></a>
- <h3 class="section">50.11 Kvazaar<span class="pull-right"><a class="anchor hidden-xs" href="#Kvazaar" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Kvazaar" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the Kvazaar library for HEVC encoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/ultravideo/kvazaar">https://github.com/ultravideo/kvazaar</a> and follow the
- instructions for installing the library. Then pass
- <code class="code">--enable-libkvazaar</code> to configure to enable it.
- </p>
- <a name="LAME"></a>
- <h3 class="section">50.12 LAME<span class="pull-right"><a class="anchor hidden-xs" href="#LAME" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-LAME" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the LAME library for MP3 encoding.
- </p>
- <p>Go to <a class="url" href="http://lame.sourceforge.net/">http://lame.sourceforge.net/</a> and follow the
- instructions for installing the library.
- Then pass <code class="code">--enable-libmp3lame</code> to configure to enable it.
- </p>
- <a name="LCEVCdec"></a>
- <h3 class="section">50.13 LCEVCdec<span class="pull-right"><a class="anchor hidden-xs" href="#LCEVCdec" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-LCEVCdec" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the liblcevc_dec library for LCEVC enhancement layer
- decoding on supported bitstreams.
- </p>
- <p>Go to <a class="url" href="https://github.com/v-novaltd/LCEVCdec">https://github.com/v-novaltd/LCEVCdec</a> and follow the instructions
- for installing the library. Then pass <code class="code">--enable-liblcevc-dec</code> to configure to
- enable it.
- </p>
- <div class="info">
- <p>LCEVCdec is under the BSD-3-Clause-Clear License.
- </p></div>
- <a name="libilbc-1"></a>
- <h3 class="section">50.14 libilbc<span class="pull-right"><a class="anchor hidden-xs" href="#libilbc-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libilbc-1" aria-hidden="true">TOC</a></span></h3>
- <p>iLBC is a narrowband speech codec that has been made freely available
- by Google as part of the WebRTC project. libilbc is a packaging friendly
- copy of the iLBC codec. FFmpeg can make use of the libilbc library for
- iLBC decoding and encoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/TimothyGu/libilbc">https://github.com/TimothyGu/libilbc</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libilbc</code> to configure to
- enable it.
- </p>
- <a name="libjxl-1"></a>
- <h3 class="section">50.15 libjxl<span class="pull-right"><a class="anchor hidden-xs" href="#libjxl-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libjxl-1" aria-hidden="true">TOC</a></span></h3>
- <p>JPEG XL is an image format intended to fully replace legacy JPEG for an extended
- period of life. See <a class="url" href="https://jpegxl.info/">https://jpegxl.info/</a> for more information, and see
- <a class="url" href="https://github.com/libjxl/libjxl">https://github.com/libjxl/libjxl</a> for the library source. You can pass
- <code class="code">--enable-libjxl</code> to configure in order enable the libjxl wrapper.
- </p>
- <a name="libvpx-1"></a>
- <h3 class="section">50.16 libvpx<span class="pull-right"><a class="anchor hidden-xs" href="#libvpx-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libvpx-1" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the libvpx library for VP8/VP9 decoding and encoding.
- </p>
- <p>Go to <a class="url" href="http://www.webmproject.org/">http://www.webmproject.org/</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libvpx</code> to configure to
- enable it.
- </p>
- <a name="ModPlug"></a>
- <h3 class="section">50.17 ModPlug<span class="pull-right"><a class="anchor hidden-xs" href="#ModPlug" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ModPlug" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of this library, originating in Modplug-XMMS, to read from MOD-like music files.
- See <a class="url" href="https://github.com/Konstanty/libmodplug">https://github.com/Konstanty/libmodplug</a>. Pass <code class="code">--enable-libmodplug</code> to configure to
- enable it.
- </p>
- <a name="OpenCORE_002c-VisualOn_002c-and-Fraunhofer-libraries"></a>
- <h3 class="section">50.18 OpenCORE, VisualOn, and Fraunhofer libraries<span class="pull-right"><a class="anchor hidden-xs" href="#OpenCORE_002c-VisualOn_002c-and-Fraunhofer-libraries" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-OpenCORE_002c-VisualOn_002c-and-Fraunhofer-libraries" aria-hidden="true">TOC</a></span></h3>
- <p>Spun off Google Android sources, OpenCore, VisualOn and Fraunhofer
- libraries provide encoders for a number of audio codecs.
- </p>
- <div class="info">
- <p>OpenCORE and VisualOn libraries are under the Apache License 2.0
- (see <a class="url" href="http://www.apache.org/licenses/LICENSE-2.0">http://www.apache.org/licenses/LICENSE-2.0</a> for details), which is
- incompatible to the LGPL version 2.1 and GPL version 2. You have to
- upgrade FFmpeg’s license to LGPL version 3 (or if you have enabled
- GPL components, GPL version 3) by passing <code class="code">--enable-version3</code> to configure in
- order to use it.
- </p>
- <p>The license of the Fraunhofer AAC library is incompatible with the GPL.
- Therefore, for GPL builds, you have to pass <code class="code">--enable-nonfree</code> to
- configure in order to use it. To the best of our knowledge, it is
- compatible with the LGPL.
- </p></div>
- <a name="OpenCORE-AMR"></a>
- <h4 class="subsection">50.18.1 OpenCORE AMR<span class="pull-right"><a class="anchor hidden-xs" href="#OpenCORE-AMR" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-OpenCORE-AMR" aria-hidden="true">TOC</a></span></h4>
- <p>FFmpeg can make use of the OpenCORE libraries for AMR-NB
- decoding/encoding and AMR-WB decoding.
- </p>
- <p>Go to <a class="url" href="http://sourceforge.net/projects/opencore-amr/">http://sourceforge.net/projects/opencore-amr/</a> and follow the
- instructions for installing the libraries.
- Then pass <code class="code">--enable-libopencore-amrnb</code> and/or
- <code class="code">--enable-libopencore-amrwb</code> to configure to enable them.
- </p>
- <a name="VisualOn-AMR_002dWB-encoder-library"></a>
- <h4 class="subsection">50.18.2 VisualOn AMR-WB encoder library<span class="pull-right"><a class="anchor hidden-xs" href="#VisualOn-AMR_002dWB-encoder-library" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-VisualOn-AMR_002dWB-encoder-library" aria-hidden="true">TOC</a></span></h4>
- <p>FFmpeg can make use of the VisualOn AMR-WBenc library for AMR-WB encoding.
- </p>
- <p>Go to <a class="url" href="http://sourceforge.net/projects/opencore-amr/">http://sourceforge.net/projects/opencore-amr/</a> and follow the
- instructions for installing the library.
- Then pass <code class="code">--enable-libvo-amrwbenc</code> to configure to enable it.
- </p>
- <a name="Fraunhofer-AAC-library"></a>
- <h4 class="subsection">50.18.3 Fraunhofer AAC library<span class="pull-right"><a class="anchor hidden-xs" href="#Fraunhofer-AAC-library" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Fraunhofer-AAC-library" aria-hidden="true">TOC</a></span></h4>
- <p>FFmpeg can make use of the Fraunhofer AAC library for AAC decoding & encoding.
- </p>
- <p>Go to <a class="url" href="http://sourceforge.net/projects/opencore-amr/">http://sourceforge.net/projects/opencore-amr/</a> and follow the
- instructions for installing the library.
- Then pass <code class="code">--enable-libfdk-aac</code> to configure to enable it.
- </p>
- <a name="Fraunhofer-MPEG_002dH-3D-Audio-decoder-library"></a>
- <h4 class="subsection">50.18.4 Fraunhofer MPEG-H 3D Audio decoder library<span class="pull-right"><a class="anchor hidden-xs" href="#Fraunhofer-MPEG_002dH-3D-Audio-decoder-library" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Fraunhofer-MPEG_002dH-3D-Audio-decoder-library" aria-hidden="true">TOC</a></span></h4>
- <p>FFmpeg can make use of the Fraunhofer MPEG-H decoder library for MPEG-H 3DA decoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/Fraunhofer-IIS/mpeghdec">https://github.com/Fraunhofer-IIS/mpeghdec</a> and follow the
- instructions for installing the library.
- Then pass <code class="code">--enable-libmpeghdec --enable-nonfree</code> to configure to enable it.
- </p>
- <a name="LC3-library"></a>
- <h4 class="subsection">50.18.5 LC3 library<span class="pull-right"><a class="anchor hidden-xs" href="#LC3-library" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-LC3-library" aria-hidden="true">TOC</a></span></h4>
- <p>FFmpeg can make use of the Google LC3 library for LC3 decoding & encoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/google/liblc3/">https://github.com/google/liblc3/</a> and follow the instructions for
- installing the library.
- Then pass <code class="code">--enable-liblc3</code> to configure to enable it.
- </p>
- <a name="OpenH264"></a>
- <h3 class="section">50.19 OpenH264<span class="pull-right"><a class="anchor hidden-xs" href="#OpenH264" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-OpenH264" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the OpenH264 library for H.264 decoding and encoding.
- </p>
- <p>Go to <a class="url" href="http://www.openh264.org/">http://www.openh264.org/</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libopenh264</code> to configure to
- enable it.
- </p>
- <p>For decoding, this library is much more limited than the built-in decoder
- in libavcodec; currently, this library lacks support for decoding B-frames
- and some other main/high profile features. (It currently only supports
- constrained baseline profile and CABAC.) Using it is mostly useful for
- testing and for taking advantage of Cisco’s patent portfolio license
- (<a class="url" href="http://www.openh264.org/BINARY_LICENSE.txt">http://www.openh264.org/BINARY_LICENSE.txt</a>).
- </p>
- <a name="OpenJPEG"></a>
- <h3 class="section">50.20 OpenJPEG<span class="pull-right"><a class="anchor hidden-xs" href="#OpenJPEG" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-OpenJPEG" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can use the OpenJPEG libraries for decoding/encoding J2K videos. Go to
- <a class="url" href="http://www.openjpeg.org/">http://www.openjpeg.org/</a> to get the libraries and follow the installation
- instructions. To enable using OpenJPEG in FFmpeg, pass <code class="code">--enable-libopenjpeg</code> to
- <samp class="file">./configure</samp>.
- </p>
- <a name="rav1e"></a>
- <h3 class="section">50.21 rav1e<span class="pull-right"><a class="anchor hidden-xs" href="#rav1e" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-rav1e" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of rav1e (Rust AV1 Encoder) via its C bindings to encode videos.
- Go to <a class="url" href="https://github.com/xiph/rav1e/">https://github.com/xiph/rav1e/</a> and follow the instructions to build
- the C library. To enable using rav1e in FFmpeg, pass <code class="code">--enable-librav1e</code>
- to <samp class="file">./configure</samp>.
- </p>
- <a name="SVT_002dAV1"></a>
- <h3 class="section">50.22 SVT-AV1<span class="pull-right"><a class="anchor hidden-xs" href="#SVT_002dAV1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-SVT_002dAV1" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the Scalable Video Technology for AV1 library for AV1 encoding.
- </p>
- <p>Go to <a class="url" href="https://gitlab.com/AOMediaCodec/SVT-AV1/">https://gitlab.com/AOMediaCodec/SVT-AV1/</a> and follow the instructions
- for installing the library. Then pass <code class="code">--enable-libsvtav1</code> to configure to
- enable it.
- </p>
- <a name="SVT_002dJPEG_002dXS"></a>
- <h3 class="section">50.23 SVT-JPEG-XS<span class="pull-right"><a class="anchor hidden-xs" href="#SVT_002dJPEG_002dXS" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-SVT_002dJPEG_002dXS" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the Scalable Video Technology for JPEG-XS library for JPEG-XS
- decoding and encoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/OpenVisualCloud/SVT-JPEG-XS">https://github.com/OpenVisualCloud/SVT-JPEG-XS</a> and follow the instructions
- for installing the library. Then pass <code class="code">--enable-libsvtjpegxs</code> to configure to
- enable it.
- </p>
- <a name="TwoLAME"></a>
- <h3 class="section">50.24 TwoLAME<span class="pull-right"><a class="anchor hidden-xs" href="#TwoLAME" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-TwoLAME" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the TwoLAME library for MP2 encoding.
- </p>
- <p>Go to <a class="url" href="http://www.twolame.org/">http://www.twolame.org/</a> and follow the
- instructions for installing the library.
- Then pass <code class="code">--enable-libtwolame</code> to configure to enable it.
- </p>
- <a name="VapourSynth"></a>
- <h3 class="section">50.25 VapourSynth<span class="pull-right"><a class="anchor hidden-xs" href="#VapourSynth" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-VapourSynth" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can read VapourSynth scripts as input. To enable support, pass
- <code class="code">--enable-vapoursynth</code> to configure. Vapoursynth is detected via
- <code class="code">pkg-config</code>. Versions 42 or greater supported.
- See <a class="url" href="http://www.vapoursynth.com/">http://www.vapoursynth.com/</a>.
- </p>
- <p>Due to security concerns, Vapoursynth scripts will not
- be autodetected so the input format has to be forced. For ff* CLI tools,
- add <code class="code">-f vapoursynth</code> before the input <code class="code">-i yourscript.vpy</code>.
- </p>
- <a name="x264"></a>
- <h3 class="section">50.26 x264<span class="pull-right"><a class="anchor hidden-xs" href="#x264" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-x264" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the x264 library for H.264 encoding.
- </p>
- <p>Go to <a class="url" href="http://www.videolan.org/developers/x264.html">http://www.videolan.org/developers/x264.html</a> and follow the
- instructions for installing the library. Then pass <code class="code">--enable-libx264</code> to
- configure to enable it.
- </p>
- <div class="info">
- <p>x264 is under the GNU Public License Version 2 or later
- (see <a class="url" href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html">http://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a> for
- details), you must upgrade FFmpeg’s license to GPL in order to use it.
- </p></div>
- <a name="x265"></a>
- <h3 class="section">50.27 x265<span class="pull-right"><a class="anchor hidden-xs" href="#x265" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-x265" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the x265 library for HEVC encoding.
- </p>
- <p>Go to <a class="url" href="http://x265.org/developers.html">http://x265.org/developers.html</a> and follow the instructions
- for installing the library. Then pass <code class="code">--enable-libx265</code> to configure
- to enable it.
- </p>
- <div class="info">
- <p>x265 is under the GNU Public License Version 2 or later
- (see <a class="url" href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html">http://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a> for
- details), you must upgrade FFmpeg’s license to GPL in order to use it.
- </p></div>
- <a name="xavs"></a>
- <h3 class="section">50.28 xavs<span class="pull-right"><a class="anchor hidden-xs" href="#xavs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xavs" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the xavs library for AVS encoding.
- </p>
- <p>Go to <a class="url" href="http://xavs.sf.net/">http://xavs.sf.net/</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libxavs</code> to configure to
- enable it.
- </p>
- <a name="xavs2"></a>
- <h3 class="section">50.29 xavs2<span class="pull-right"><a class="anchor hidden-xs" href="#xavs2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xavs2" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the xavs2 library for AVS2-P2/IEEE1857.4 video encoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/pkuvcl/xavs2">https://github.com/pkuvcl/xavs2</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libxavs2</code> to configure to
- enable it.
- </p>
- <div class="info">
- <p>libxavs2 is under the GNU Public License Version 2 or later
- (see <a class="url" href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html">http://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a> for
- details), you must upgrade FFmpeg’s license to GPL in order to use it.
- </p></div>
- <a name="eXtra_002dfast-Essential-Video-Encoder-_0028XEVE_0029"></a>
- <h3 class="section">50.30 eXtra-fast Essential Video Encoder (XEVE)<span class="pull-right"><a class="anchor hidden-xs" href="#eXtra_002dfast-Essential-Video-Encoder-_0028XEVE_0029" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-eXtra_002dfast-Essential-Video-Encoder-_0028XEVE_0029" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the XEVE library for EVC video encoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/mpeg5/xeve">https://github.com/mpeg5/xeve</a> and follow the instructions for
- installing the XEVE library. Then pass <code class="code">--enable-libxeve</code> to configure to
- enable it.
- </p>
- <a name="eXtra_002dfast-Essential-Video-Decoder-_0028XEVD_0029"></a>
- <h3 class="section">50.31 eXtra-fast Essential Video Decoder (XEVD)<span class="pull-right"><a class="anchor hidden-xs" href="#eXtra_002dfast-Essential-Video-Decoder-_0028XEVD_0029" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-eXtra_002dfast-Essential-Video-Decoder-_0028XEVD_0029" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can make use of the XEVD library for EVC video decoding.
- </p>
- <p>Go to <a class="url" href="https://github.com/mpeg5/xevd">https://github.com/mpeg5/xevd</a> and follow the instructions for
- installing the XEVD library. Then pass <code class="code">--enable-libxevd</code> to configure to
- enable it.
- </p>
- <a name="ZVBI"></a>
- <h3 class="section">50.32 ZVBI<span class="pull-right"><a class="anchor hidden-xs" href="#ZVBI" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ZVBI" aria-hidden="true">TOC</a></span></h3>
- <p>ZVBI is a VBI decoding library which can be used by FFmpeg to decode DVB
- teletext pages and DVB teletext subtitles.
- </p>
- <p>Go to <a class="url" href="http://sourceforge.net/projects/zapping/">http://sourceforge.net/projects/zapping/</a> and follow the instructions for
- installing the library. Then pass <code class="code">--enable-libzvbi</code> to configure to
- enable it.
- </p>
- <a name="Supported-File-Formats_002c-Codecs-or-Features"></a>
- <h2 class="chapter">51 Supported File Formats, Codecs or Features<span class="pull-right"><a class="anchor hidden-xs" href="#Supported-File-Formats_002c-Codecs-or-Features" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Supported-File-Formats_002c-Codecs-or-Features" aria-hidden="true">TOC</a></span></h2>
- <p>You can use the <code class="code">-formats</code> and <code class="code">-codecs</code> options to have an exhaustive list.
- </p>
- <a name="File-Formats"></a>
- <h3 class="section">51.1 File Formats<span class="pull-right"><a class="anchor hidden-xs" href="#File-Formats" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-File-Formats" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg supports the following file formats through the <code class="code">libavformat</code>
- library:
- </p>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Encoding</td><td width="10%">Decoding</td><td width="40%">Comments</td></tr>
- <tr><td width="40%">3dostr</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">4xm</td><td width="10%"></td><td width="10%">X</td><td width="40%">4X Technologies format, used in some games.</td></tr>
- <tr><td width="40%">8088flex TMV</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">AAX</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audible Enhanced Audio format, used in audiobooks.</td></tr>
- <tr><td width="40%">AA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audible Format 2, 3, and 4, used in audiobooks.</td></tr>
- <tr><td width="40%">ACT Voice</td><td width="10%"></td><td width="10%">X</td><td width="40%">contains G.729 audio</td></tr>
- <tr><td width="40%">Adobe Filmstrip</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Audio IFF (AIFF)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">American Laser Games MM</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used in games like Mad Dog McCree.</td></tr>
- <tr><td width="40%">3GPP AMR</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Amazing Studio Packed Animation File</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used in game Heart Of Darkness.</td></tr>
- <tr><td width="40%">Apple HTTP Live Streaming</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Artworx Data Format</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Interplay ACM</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio only format used in some Interplay games.</td></tr>
- <tr><td width="40%">ADP</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the Nintendo Gamecube.</td></tr>
- <tr><td width="40%">AFC</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the Nintendo Gamecube.</td></tr>
- <tr><td width="40%">ADS/SS2</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the PS2.</td></tr>
- <tr><td width="40%">APNG</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ASF</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Advanced / Active Streaming Format.</td></tr>
- <tr><td width="40%">AST</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Audio format used on the Nintendo Wii.</td></tr>
- <tr><td width="40%">AVI</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">AviSynth</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">AVR</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on Mac.</td></tr>
- <tr><td width="40%">AVS</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used by the Creature Shock game.</td></tr>
- <tr><td width="40%">Beam Software SIFF</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio and video format used in some games by Beam Software.</td></tr>
- <tr><td width="40%">Bethesda Softworks VID</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in some games from Bethesda Softworks.</td></tr>
- <tr><td width="40%">Binary text</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Bink</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used by many games.</td></tr>
- <tr><td width="40%">Bink Audio</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio only multimedia format used by some games.</td></tr>
- <tr><td width="40%">Bitmap Brothers JV</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Z and Z95 games.</td></tr>
- <tr><td width="40%">BRP</td><td width="10%"></td><td width="10%">X</td><td width="40%">Argonaut Games format.</td></tr>
- <tr><td width="40%">Brute Force & Ignorance</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in the game Flash Traffic: City of Angels.</td></tr>
- <tr><td width="40%">BFSTM</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the Nintendo WiiU (based on BRSTM).</td></tr>
- <tr><td width="40%">BRSTM</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the Nintendo Wii.</td></tr>
- <tr><td width="40%">BW64</td><td width="10%"></td><td width="10%">X</td><td width="40%">Broadcast Wave 64bit.</td></tr>
- <tr><td width="40%">BWF</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">codec2 (raw)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Must be given -mode format option to decode correctly.</td></tr>
- <tr><td width="40%">codec2 (.c2 files)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Contains header with version and mode info, simplifying playback.</td></tr>
- <tr><td width="40%">CRI ADX</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Audio-only format used in console video games.</td></tr>
- <tr><td width="40%">CRI AIX</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">CRI HCA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio-only format used in console video games.</td></tr>
- <tr><td width="40%">Discworld II BMV</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Interplay C93</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in the game Cyberia from Interplay.</td></tr>
- <tr><td width="40%">Delphine Software International CIN</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used by Delphine Software games.</td></tr>
- <tr><td width="40%">Digital Speech Standard (DSS)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">CD+G</td><td width="10%"></td><td width="10%">X</td><td width="40%">Video format used by CD+G karaoke disks</td></tr>
- <tr><td width="40%">Phantom Cine</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Commodore CDXL</td><td width="10%"></td><td width="10%">X</td><td width="40%">Amiga CD video format</td></tr>
- <tr><td width="40%">Core Audio Format</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Apple Core Audio Format</td></tr>
- <tr><td width="40%">CRC testing format</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">Creative Voice</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Created for the Sound Blaster Pro.</td></tr>
- <tr><td width="40%">CRYO APC</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used in some games by CRYO Interactive Entertainment.</td></tr>
- <tr><td width="40%">D-Cinema audio</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Deluxe Paint Animation</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DCSTR</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DFA</td><td width="10%"></td><td width="10%">X</td><td width="40%">This format is used in Chronomaster game</td></tr>
- <tr><td width="40%">DirectDraw Surface</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DSD Stream File (DSF)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DV video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">DXA</td><td width="10%"></td><td width="10%">X</td><td width="40%">This format is used in the non-Windows version of the Feeble Files
- game and different game cutscenes repacked for use with ScummVM.</td></tr>
- <tr><td width="40%">Electronic Arts cdata</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Electronic Arts Multimedia</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in various EA games; files have extensions like WVE and UV2.</td></tr>
- <tr><td width="40%">Ensoniq Paris Audio File</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">FFM (FFserver live feed)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Flash (SWF)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Flash 9 (AVM2)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Only embedded audio is decoded.</td></tr>
- <tr><td width="40%">FLI/FLC/FLX animation</td><td width="10%"></td><td width="10%">X</td><td width="40%">.fli/.flc files</td></tr>
- <tr><td width="40%">Flash Video (FLV)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Macromedia Flash video files</td></tr>
- <tr><td width="40%">framecrc testing format</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">FunCom ISS</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used in various games from FunCom like The Longest Journey.</td></tr>
- <tr><td width="40%">G.723.1</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">G.726</td><td width="10%"></td><td width="10%">X</td><td width="40%">Both left- and right-justified.</td></tr>
- <tr><td width="40%">G.729 BIT</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">G.729 raw</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">GENH</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format for various games.</td></tr>
- <tr><td width="40%">GIF Animation</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">GXF</td><td width="10%">X</td><td width="10%">X</td><td width="40%">General eXchange Format SMPTE 360M, used by Thomson Grass Valley
- playout servers.</td></tr>
- <tr><td width="40%">HNM</td><td width="10%"></td><td width="10%">X</td><td width="40%">Only version 4 supported, used in some games from Cryo Interactive</td></tr>
- <tr><td width="40%">iCEDraw File</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ICO</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Microsoft Windows ICO</td></tr>
- <tr><td width="40%">id Quake II CIN video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">id RoQ</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Quake III, Jedi Knight 2 and other computer games.</td></tr>
- <tr><td width="40%">IEC61937 encapsulation</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">IFF</td><td width="10%"></td><td width="10%">X</td><td width="40%">Interchange File Format</td></tr>
- <tr><td width="40%">IFV</td><td width="10%"></td><td width="10%">X</td><td width="40%">A format used by some old CCTV DVRs.</td></tr>
- <tr><td width="40%">iLBC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Interplay MVE</td><td width="10%"></td><td width="10%">X</td><td width="40%">Format used in various Interplay computer games.</td></tr>
- <tr><td width="40%">Iterated Systems ClearVideo</td><td width="10%"></td><td width="10%">X</td><td width="40%">I-frames only</td></tr>
- <tr><td width="40%">IV8</td><td width="10%"></td><td width="10%">X</td><td width="40%">A format generated by IndigoVision 8000 video server.</td></tr>
- <tr><td width="40%">IVF (On2)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">A format used by libvpx</td></tr>
- <tr><td width="40%">Internet Video Recording</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">IRCAM</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">LAF</td><td width="10%"></td><td width="10%">X</td><td width="40%">Limitless Audio Format</td></tr>
- <tr><td width="40%">LATM</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">LMLM4</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used by Linux Media Labs MPEG-4 PCI boards</td></tr>
- <tr><td width="40%">LOAS</td><td width="10%"></td><td width="10%">X</td><td width="40%">contains LATM multiplexed AAC audio</td></tr>
- <tr><td width="40%">LRC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">LVF</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">LXF</td><td width="10%"></td><td width="10%">X</td><td width="40%">VR native stream format, used by Leitch/Harris’ video servers.</td></tr>
- <tr><td width="40%">Magic Lantern Video (MLV)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Matroska</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Matroska audio</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">FFmpeg metadata</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Metadata in text format.</td></tr>
- <tr><td width="40%">MAXIS XA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Sim City 3000; file extension .xa.</td></tr>
- <tr><td width="40%">MCA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in some games from Capcom; file extension .mca.</td></tr>
- <tr><td width="40%">MD Studio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Metal Gear Solid: The Twin Snakes</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Megalux Frame</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used by Megalux Ultimate Paint</td></tr>
- <tr><td width="40%">MobiClip MODS</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MobiClip MOFLEX</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Mobotix .mxg</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Monkey’s Audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Motion Pixels MVI</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MOV/QuickTime/MP4</td><td width="10%">X</td><td width="10%">X</td><td width="40%">3GP, 3GP2, PSP, iPod variants supported</td></tr>
- <tr><td width="40%">MP2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MP3</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-1 System</td><td width="10%">X</td><td width="10%">X</td><td width="40%">muxed audio and video, VCD format supported</td></tr>
- <tr><td width="40%">MPEG-PS (program stream)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">also known as <code class="code">VOB</code> file, SVCD and DVD format supported</td></tr>
- <tr><td width="40%">MPEG-TS (transport stream)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">also known as DVB Transport Stream</td></tr>
- <tr><td width="40%">MPEG-4</td><td width="10%">X</td><td width="10%">X</td><td width="40%">MPEG-4 is a variant of QuickTime.</td></tr>
- <tr><td width="40%">MSF</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the PS3.</td></tr>
- <tr><td width="40%">Mirillis FIC video</td><td width="10%"></td><td width="10%">X</td><td width="40%">No cursor rendering.</td></tr>
- <tr><td width="40%">MIDI Sample Dump Standard</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MIME multipart JPEG</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">MSN TCP webcam</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used by MSN Messenger webcam streams.</td></tr>
- <tr><td width="40%">MTV</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Musepack</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Musepack SV8</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Material eXchange Format (MXF)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">SMPTE 377M, used by D-Cinema, broadcast industry.</td></tr>
- <tr><td width="40%">Material eXchange Format (MXF), D-10 Mapping</td><td width="10%">X</td><td width="10%">X</td><td width="40%">SMPTE 386M, D-10/IMX Mapping.</td></tr>
- <tr><td width="40%">NC camera feed</td><td width="10%"></td><td width="10%">X</td><td width="40%">NC (AVIP NC4600) camera streams</td></tr>
- <tr><td width="40%">NIST SPeech HEader REsources</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Computerized Speech Lab NSP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">NTT TwinVQ (VQF)</td><td width="10%"></td><td width="10%">X</td><td width="40%">Nippon Telegraph and Telephone Corporation TwinVQ.</td></tr>
- <tr><td width="40%">Nullsoft Streaming Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">NuppelVideo</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">NUT</td><td width="10%">X</td><td width="10%">X</td><td width="40%">NUT Open Container Format</td></tr>
- <tr><td width="40%">Ogg</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Playstation Portable PMP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Portable Voice Format</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RK Audio (RKA)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">TechnoTrend PVA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used by TechnoTrend DVB PCI boards.</td></tr>
- <tr><td width="40%">QCP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw ADTS (AAC)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw AC-3</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw AMR-NB</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw AMR-WB</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw APAC</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw APV</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw aptX</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw aptX HD</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw Bonk</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw Chinese AVS video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw DFPWM</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw Dirac</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw DNxHD</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw DTS</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw DTS-HD</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw E-AC-3</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw EVC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw FLAC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw G.728</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw GSM</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw H.261</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw H.263</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw H.264</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw HEVC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw Ingenient MJPEG</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw MJPEG</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw MLP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw MPEG</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw MPEG-1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw MPEG-2</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw MPEG-4</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw NULL</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">raw video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw id RoQ</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">raw OBU</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw OSQ</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw SBC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw Shorten</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw TAK</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw TrueHD</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw VC-1</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM A-law</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM mu-law</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM Archimedes VIDC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 8 bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 16 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 16 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 24 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 24 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 32 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 32 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 64 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM signed 64 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 8 bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 16 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 16 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 24 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 24 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 32 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM unsigned 32 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM 16.8 floating point little-endian</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM 24.0 floating point little-endian</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM floating-point 32 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM floating-point 32 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM floating-point 64 bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">raw PCM floating-point 64 bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">RDT</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">REDCODE R3D</td><td width="10%"></td><td width="10%">X</td><td width="40%">File format used by RED Digital cameras, contains JPEG 2000 frames and PCM audio.</td></tr>
- <tr><td width="40%">RealMedia</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Redirector</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RedSpark</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Renderware TeXture Dictionary</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Resolume DXV</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Encoding is only supported for the DXT1 (Normal Quality, No Alpha) texture format.</td></tr>
- <tr><td width="40%">RF64</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RL2</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio and video format used in some games by Entertainment Software Partners.</td></tr>
- <tr><td width="40%">RPL/ARMovie</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Lego Mindstorms RSO</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">RSD</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMP</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Output is performed by publishing stream to RTMP server</td></tr>
- <tr><td width="40%">RTP</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTSP</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Sample Dump eXchange</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SAP</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SBG</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SDNS</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SDP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SER</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Digital Pictures SGA</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Sega FILM/CPK</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in many Sega Saturn console games.</td></tr>
- <tr><td width="40%">Silicon Graphics Movie</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Sierra SOL</td><td width="10%"></td><td width="10%">X</td><td width="40%">.sol files used in Sierra Online games.</td></tr>
- <tr><td width="40%">Sierra VMD</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Sierra CD-ROM games.</td></tr>
- <tr><td width="40%">Smacker</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used by many games.</td></tr>
- <tr><td width="40%">SMJPEG</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in certain Loki game ports.</td></tr>
- <tr><td width="40%">SMPTE 337M encapsulation</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Smush</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used in some LucasArts games.</td></tr>
- <tr><td width="40%">Sony OpenMG (OMA)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Audio format used in Sony Sonic Stage and Sony Vegas.</td></tr>
- <tr><td width="40%">Sony PlayStation STR</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Sony Wave64 (W64)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SoX native format</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SUN AU format</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SUP raw PGS subtitles</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SVAG</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used in Konami PS2 games.</td></tr>
- <tr><td width="40%">TDSC</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Text files</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">THP</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used on the Nintendo GameCube.</td></tr>
- <tr><td width="40%">Tiertex Limited SEQ</td><td width="10%"></td><td width="10%">X</td><td width="40%">Tiertex .seq files used in the DOS CD-ROM version of the game Flashback.</td></tr>
- <tr><td width="40%">True Audio</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">VAG</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used in many Sony PS2 games.</td></tr>
- <tr><td width="40%">VC-1 test bitstream</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Vidvox Hap</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Vivo</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">VPK</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used in Sony PS games.</td></tr>
- <tr><td width="40%">Marble WADY</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">WAV</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Waveform Archiver</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">WavPack</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">WebM</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Televison (WTV)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Wing Commander III movie</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used in Origin’s Wing Commander III computer game.</td></tr>
- <tr><td width="40%">Westwood Studios audio</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Multimedia format used in Westwood Studios games.</td></tr>
- <tr><td width="40%">Westwood Studios VQA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Multimedia format used in Westwood Studios games.</td></tr>
- <tr><td width="40%">Wideband Single-bit Data (WSD)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">WVE</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Konami XMD</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">XMV</td><td width="10%"></td><td width="10%">X</td><td width="40%">Microsoft video container used in Xbox games.</td></tr>
- <tr><td width="40%">XVAG</td><td width="10%"></td><td width="10%">X</td><td width="40%">Audio format used on the PS3.</td></tr>
- <tr><td width="40%">xWMA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Microsoft audio container used by XAudio 2.</td></tr>
- <tr><td width="40%">eXtended BINary text (XBIN)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">YUV4MPEG pipe</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Psygnosis YOP</td><td width="10%"></td><td width="10%">X</td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that the feature in that column (encoding / decoding) is supported.
- </p>
- <a name="Image-Formats"></a>
- <h3 class="section">51.2 Image Formats<span class="pull-right"><a class="anchor hidden-xs" href="#Image-Formats" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Image-Formats" aria-hidden="true">TOC</a></span></h3>
- <p>FFmpeg can read and write images for each frame of a video sequence. The
- following image formats are supported:
- </p>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Encoding</td><td width="10%">Decoding</td><td width="40%">Comments</td></tr>
- <tr><td width="40%">.Y.U.V</td><td width="10%">X</td><td width="10%">X</td><td width="40%">one raw file per component</td></tr>
- <tr><td width="40%">Alias PIX</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Alias/Wavefront PIX image format</td></tr>
- <tr><td width="40%">animated GIF</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">APNG</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Animated Portable Network Graphics</td></tr>
- <tr><td width="40%">BMP</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Microsoft BMP image</td></tr>
- <tr><td width="40%">BRender PIX</td><td width="10%"></td><td width="10%">X</td><td width="40%">Argonaut BRender 3D engine image format.</td></tr>
- <tr><td width="40%">CRI</td><td width="10%"></td><td width="10%">X</td><td width="40%">Cintel RAW</td></tr>
- <tr><td width="40%">DPX</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Digital Picture Exchange</td></tr>
- <tr><td width="40%">EXR</td><td width="10%"></td><td width="10%">X</td><td width="40%">OpenEXR</td></tr>
- <tr><td width="40%">FITS</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Flexible Image Transport System</td></tr>
- <tr><td width="40%">HDR</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Radiance HDR RGBE Image format</td></tr>
- <tr><td width="40%">IMG</td><td width="10%"></td><td width="10%">X</td><td width="40%">GEM Raster image</td></tr>
- <tr><td width="40%">JPEG</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Progressive JPEG is not supported.</td></tr>
- <tr><td width="40%">JPEG 2000</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">JPEG-LS</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">JPEG-XS</td><td width="10%">E</td><td width="10%">E</td><td width="40%">Supported through external library libsvtjpegxs</td></tr>
- <tr><td width="40%">LJPEG</td><td width="10%">X</td><td width="10%"></td><td width="40%">Lossless JPEG</td></tr>
- <tr><td width="40%">Media 100</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MSP</td><td width="10%"></td><td width="10%">X</td><td width="40%">Microsoft Paint image</td></tr>
- <tr><td width="40%">PAM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">PAM is a PNM extension with alpha support.</td></tr>
- <tr><td width="40%">PBM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Portable BitMap image</td></tr>
- <tr><td width="40%">PCD</td><td width="10%"></td><td width="10%">X</td><td width="40%">PhotoCD</td></tr>
- <tr><td width="40%">PCX</td><td width="10%">X</td><td width="10%">X</td><td width="40%">PC Paintbrush</td></tr>
- <tr><td width="40%">PFM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Portable FloatMap image</td></tr>
- <tr><td width="40%">PGM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Portable GrayMap image</td></tr>
- <tr><td width="40%">PGMYUV</td><td width="10%">X</td><td width="10%">X</td><td width="40%">PGM with U and V components in YUV 4:2:0</td></tr>
- <tr><td width="40%">PGX</td><td width="10%"></td><td width="10%">X</td><td width="40%">PGX file decoder</td></tr>
- <tr><td width="40%">PHM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Portable HalfFloatMap image</td></tr>
- <tr><td width="40%">PIC</td><td width="10%"></td><td width="10%">X</td><td width="40%">Pictor/PC Paint</td></tr>
- <tr><td width="40%">PNG</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Portable Network Graphics image</td></tr>
- <tr><td width="40%">PPM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Portable PixelMap image</td></tr>
- <tr><td width="40%">PSD</td><td width="10%"></td><td width="10%">X</td><td width="40%">Photoshop</td></tr>
- <tr><td width="40%">PTX</td><td width="10%"></td><td width="10%">X</td><td width="40%">V.Flash PTX format</td></tr>
- <tr><td width="40%">QOI</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Quite OK Image format</td></tr>
- <tr><td width="40%">SGI</td><td width="10%">X</td><td width="10%">X</td><td width="40%">SGI RGB image format</td></tr>
- <tr><td width="40%">Sun Rasterfile</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Sun RAS image format</td></tr>
- <tr><td width="40%">TIFF</td><td width="10%">X</td><td width="10%">X</td><td width="40%">YUV, JPEG and some extension is not supported yet.</td></tr>
- <tr><td width="40%">Truevision Targa</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Targa (.TGA) image format</td></tr>
- <tr><td width="40%">VBN</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Vizrt Binary Image format</td></tr>
- <tr><td width="40%">WBMP</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Wireless Application Protocol Bitmap image format</td></tr>
- <tr><td width="40%">WebP</td><td width="10%">E</td><td width="10%">X</td><td width="40%">WebP image format, encoding supported through external library libwebp</td></tr>
- <tr><td width="40%">XBM</td><td width="10%">X</td><td width="10%">X</td><td width="40%">X BitMap image format</td></tr>
- <tr><td width="40%">XFace</td><td width="10%">X</td><td width="10%">X</td><td width="40%">X-Face image format</td></tr>
- <tr><td width="40%">XPM</td><td width="10%"></td><td width="10%">X</td><td width="40%">X PixMap image format</td></tr>
- <tr><td width="40%">XWD</td><td width="10%">X</td><td width="10%">X</td><td width="40%">X Window Dump image format</td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that the feature in that column (encoding / decoding) is supported.
- </p>
- <p><code class="code">E</code> means that support is provided through an external library.
- </p>
- <a name="Video-Codecs"></a>
- <h3 class="section">51.3 Video Codecs<span class="pull-right"><a class="anchor hidden-xs" href="#Video-Codecs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-Codecs" aria-hidden="true">TOC</a></span></h3>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Encoding</td><td width="10%">Decoding</td><td width="40%">Comments</td></tr>
- <tr><td width="40%">4X Movie</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in certain computer games.</td></tr>
- <tr><td width="40%">8088flex TMV</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">A64 multicolor</td><td width="10%">X</td><td width="10%"></td><td width="40%">Creates video suitable to be played on a commodore 64 (multicolor mode).</td></tr>
- <tr><td width="40%">Amazing Studio PAF Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">American Laser Games MM</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in games like Mad Dog McCree.</td></tr>
- <tr><td width="40%">Amuse Graphics Movie</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">AMV Video</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Chinese MP3 players.</td></tr>
- <tr><td width="40%">ANSI/ASCII art</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Apple Intermediate Codec</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Apple MJPEG-B</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Apple Pixlet</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Apple ProRes</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: apch,apcn,apcs,apco,ap4h,ap4x</td></tr>
- <tr><td width="40%">Apple QuickDraw</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: qdrw</td></tr>
- <tr><td width="40%">APV</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Argonaut Video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in some Argonaut games.</td></tr>
- <tr><td width="40%">Asus v1</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: ASV1</td></tr>
- <tr><td width="40%">Asus v2</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: ASV2</td></tr>
- <tr><td width="40%">ATI VCR1</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VCR1</td></tr>
- <tr><td width="40%">ATI VCR2</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VCR2</td></tr>
- <tr><td width="40%">Auravision Aura</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Auravision Aura 2</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Autodesk Animator Flic video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Autodesk RLE</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: AASC</td></tr>
- <tr><td width="40%">AV1</td><td width="10%">E</td><td width="10%">E</td><td width="40%">Supported through external libraries libaom, libdav1d, librav1e and libsvtav1</td></tr>
- <tr><td width="40%">Avid 1:1 10-bit RGB Packer</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: AVrp</td></tr>
- <tr><td width="40%">AVS (Audio Video Standard) video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Video encoding used by the Creature Shock game.</td></tr>
- <tr><td width="40%">AVS2-P2/IEEE1857.4</td><td width="10%">E</td><td width="10%">E</td><td width="40%">Supported through external libraries libxavs2 and libdavs2</td></tr>
- <tr><td width="40%">AVS3-P2/IEEE1857.10</td><td width="10%"></td><td width="10%">E</td><td width="40%">Supported through external library libuavs3d</td></tr>
- <tr><td width="40%">AYUV</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Microsoft uncompressed packed 4:4:4:4</td></tr>
- <tr><td width="40%">Beam Software VB</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Bethesda VID video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in some games from Bethesda Softworks.</td></tr>
- <tr><td width="40%">Bink Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">BitJazz SheerVideo</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Bitmap Brothers JV video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">y41p Brooktree uncompressed 4:1:1 12-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Brooktree ProSumer Video</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: BT20</td></tr>
- <tr><td width="40%">Brute Force & Ignorance</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in the game Flash Traffic: City of Angels.</td></tr>
- <tr><td width="40%">C93 video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in Cyberia game.</td></tr>
- <tr><td width="40%">CamStudio</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: CSCD</td></tr>
- <tr><td width="40%">CD+G</td><td width="10%"></td><td width="10%">X</td><td width="40%">Video codec for CD+G karaoke disks</td></tr>
- <tr><td width="40%">CDXL</td><td width="10%"></td><td width="10%">X</td><td width="40%">Amiga CD video codec</td></tr>
- <tr><td width="40%">Chinese AVS video</td><td width="10%">E</td><td width="10%">X</td><td width="40%">AVS1-P2, JiZhun profile, encoding through external library libxavs</td></tr>
- <tr><td width="40%">Delphine Software International CIN video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in Delphine Software International games.</td></tr>
- <tr><td width="40%">Discworld II BMV Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">CineForm HD</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Canopus HQ</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Canopus HQA</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Canopus HQX</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Canopus Lossless Codec</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">CDToons</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in various Broderbund games.</td></tr>
- <tr><td width="40%">Cinepak</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Cirrus Logic AccuPak</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: CLJR</td></tr>
- <tr><td width="40%">CPiA Video Format</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Creative YUV (CYUV)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DFA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in Chronomaster game.</td></tr>
- <tr><td width="40%">Dirac</td><td width="10%">E</td><td width="10%">X</td><td width="40%">supported though the native vc2 (Dirac Pro) encoder</td></tr>
- <tr><td width="40%">Deluxe Paint Animation</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DNxHD</td><td width="10%">X</td><td width="10%">X</td><td width="40%">aka SMPTE VC3</td></tr>
- <tr><td width="40%">Duck TrueMotion 1.0</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: DUCK</td></tr>
- <tr><td width="40%">Duck TrueMotion 2.0</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: TM20</td></tr>
- <tr><td width="40%">Duck TrueMotion 2.0 RT</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: TR20</td></tr>
- <tr><td width="40%">DV (Digital Video)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Dxtory capture format</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Feeble Files/ScummVM DXA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec originally used in Feeble Files game.</td></tr>
- <tr><td width="40%">Electronic Arts CMV video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in NHL 95 game.</td></tr>
- <tr><td width="40%">Electronic Arts Madcow video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Electronic Arts TGV video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Electronic Arts TGQ video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Electronic Arts TQI video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Escape 124</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Escape 130</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">EVC / MPEG-5 Part 1</td><td width="10%">E</td><td width="10%">E</td><td width="40%">encoding and decoding supported through external libraries libxeve and libxevd</td></tr>
- <tr><td width="40%">FFmpeg video codec #1</td><td width="10%">X</td><td width="10%">X</td><td width="40%">lossless codec (fourcc: FFV1)</td></tr>
- <tr><td width="40%">Flash Screen Video v1</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: FSV1</td></tr>
- <tr><td width="40%">Flash Screen Video v2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Flash Video (FLV)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Sorenson H.263 used in Flash</td></tr>
- <tr><td width="40%">FM Screen Capture Codec</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Forward Uncompressed</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Fraps</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Go2Meeting</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: G2M2, G2M3</td></tr>
- <tr><td width="40%">Go2Webinar</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: G2M4</td></tr>
- <tr><td width="40%">Gremlin Digital Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">H.261</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">H.263 / H.263-1996</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">H.263+ / H.263-1998 / H.263 version 2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libx264 and OpenH264</td></tr>
- <tr><td width="40%">HEVC</td><td width="10%">X</td><td width="10%">X</td><td width="40%">encoding supported through external library libx265 and libkvazaar</td></tr>
- <tr><td width="40%">HNM version 4</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">HuffYUV</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">HuffYUV FFmpeg variant</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">IBM Ultimotion</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: ULTI</td></tr>
- <tr><td width="40%">id Cinematic video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Quake II.</td></tr>
- <tr><td width="40%">id RoQ video</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Quake III, Jedi Knight 2, other computer games.</td></tr>
- <tr><td width="40%">IFF ILBM</td><td width="10%"></td><td width="10%">X</td><td width="40%">IFF interleaved bitmap</td></tr>
- <tr><td width="40%">IFF ByteRun1</td><td width="10%"></td><td width="10%">X</td><td width="40%">IFF run length encoded bitmap</td></tr>
- <tr><td width="40%">Infinity IMM4</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Intel H.263</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Intel Indeo 2</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Intel Indeo 3</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Intel Indeo 4</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Intel Indeo 5</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Interplay C93</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in the game Cyberia from Interplay.</td></tr>
- <tr><td width="40%">Interplay MVE video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Interplay .MVE files.</td></tr>
- <tr><td width="40%">J2K</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Karl Morton’s video codec</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in Worms games.</td></tr>
- <tr><td width="40%">Kega Game Video (KGV1)</td><td width="10%"></td><td width="10%">X</td><td width="40%">Kega emulator screen capture codec.</td></tr>
- <tr><td width="40%">Lagarith</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">LCEVC / MPEG-5 LCEVC / MPEG-5 Part 2</td><td width="10%"></td><td width="10%">E</td><td width="40%">decoding supported through external library liblcevc-dec</td></tr>
- <tr><td width="40%">LCL (LossLess Codec Library) MSZH</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">LCL (LossLess Codec Library) ZLIB</td><td width="10%">E</td><td width="10%">E</td></tr>
- <tr><td width="40%">LEAD MCMP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">LOCO</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">LucasArts SANM/Smush</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in LucasArts games / SMUSH animations.</td></tr>
- <tr><td width="40%">lossless MJPEG</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MagicYUV Video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Mandsoft Screen Capture Codec</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Microsoft ATC Screen</td><td width="10%"></td><td width="10%">X</td><td width="40%">Also known as Microsoft Screen 3.</td></tr>
- <tr><td width="40%">Microsoft Expression Encoder Screen</td><td width="10%"></td><td width="10%">X</td><td width="40%">Also known as Microsoft Titanium Screen 2.</td></tr>
- <tr><td width="40%">Microsoft RLE</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Microsoft Screen 1</td><td width="10%"></td><td width="10%">X</td><td width="40%">Also known as Windows Media Video V7 Screen.</td></tr>
- <tr><td width="40%">Microsoft Screen 2</td><td width="10%"></td><td width="10%">X</td><td width="40%">Also known as Windows Media Video V9 Screen.</td></tr>
- <tr><td width="40%">Microsoft Video 1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Mimic</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in MSN Messenger Webcam streams.</td></tr>
- <tr><td width="40%">Miro VideoXL</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VIXL</td></tr>
- <tr><td width="40%">MJPEG (Motion JPEG)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Mobotix MxPEG video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Motion Pixels video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-1 video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-2 video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-4 part 2</td><td width="10%">X</td><td width="10%">X</td><td width="40%">libxvidcore can be used alternatively for encoding.</td></tr>
- <tr><td width="40%">MPEG-4 part 2 Microsoft variant version 1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-4 part 2 Microsoft variant version 2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-4 part 2 Microsoft variant version 3</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Newtek SpeedHQ</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Nintendo Gamecube THP video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">NotchLC</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">NuppelVideo/RTjpeg</td><td width="10%"></td><td width="10%">X</td><td width="40%">Video encoding used in NuppelVideo files.</td></tr>
- <tr><td width="40%">On2 VP3</td><td width="10%"></td><td width="10%">X</td><td width="40%">still experimental</td></tr>
- <tr><td width="40%">On2 VP4</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VP40</td></tr>
- <tr><td width="40%">On2 VP5</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VP50</td></tr>
- <tr><td width="40%">On2 VP6</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VP60,VP61,VP62</td></tr>
- <tr><td width="40%">On2 VP7</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: VP70,VP71</td></tr>
- <tr><td width="40%">VP8</td><td width="10%">E</td><td width="10%">X</td><td width="40%">fourcc: VP80, encoding supported through external library libvpx</td></tr>
- <tr><td width="40%">VP9</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libvpx</td></tr>
- <tr><td width="40%">Pinnacle TARGA CineWave YUV16</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: Y216</td></tr>
- <tr><td width="40%">Q-team QPEG</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourccs: QPEG, Q1.0, Q1.1</td></tr>
- <tr><td width="40%">QuickTime 8BPS video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">QuickTime Animation (RLE) video</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: ’rle ’</td></tr>
- <tr><td width="40%">QuickTime Graphics (SMC)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: ’smc ’</td></tr>
- <tr><td width="40%">QuickTime video (RPZA)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: rpza</td></tr>
- <tr><td width="40%">R10K AJA Kona 10-bit RGB Codec</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">R210 Quicktime Uncompressed RGB 10-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Raw Video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">RealVideo 1.0</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">RealVideo 2.0</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">RealVideo 3.0</td><td width="10%"></td><td width="10%">X</td><td width="40%">still far from ideal</td></tr>
- <tr><td width="40%">RealVideo 4.0</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RealVideo 6.0</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Renderware TXD (TeXture Dictionary)</td><td width="10%"></td><td width="10%">X</td><td width="40%">Texture dictionaries used by the Renderware Engine.</td></tr>
- <tr><td width="40%">RivaTuner Video</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: ’RTV1’</td></tr>
- <tr><td width="40%">RL2 video</td><td width="10%"></td><td width="10%">X</td><td width="40%">used in some games by Entertainment Software Partners</td></tr>
- <tr><td width="40%">ScreenPressor</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Screenpresso</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Screen Recorder Gold Codec</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Sierra VMD video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Sierra VMD files.</td></tr>
- <tr><td width="40%">Silicon Graphics Motion Video Compressor 1 (MVC1)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Silicon Graphics Motion Video Compressor 2 (MVC2)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Silicon Graphics RLE 8-bit video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Smacker video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Video encoding used in Smacker.</td></tr>
- <tr><td width="40%">SMPTE VC-1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Snow</td><td width="10%">X</td><td width="10%">X</td><td width="40%">experimental wavelet codec (fourcc: SNOW)</td></tr>
- <tr><td width="40%">Sony PlayStation MDEC (Motion DECoder)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Sorenson Vector Quantizer 1</td><td width="10%">X</td><td width="10%">X</td><td width="40%">fourcc: SVQ1</td></tr>
- <tr><td width="40%">Sorenson Vector Quantizer 3</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: SVQ3</td></tr>
- <tr><td width="40%">Sunplus JPEG (SP5X)</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: SP5X</td></tr>
- <tr><td width="40%">TechSmith Screen Capture Codec</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: TSCC</td></tr>
- <tr><td width="40%">TechSmith Screen Capture Codec 2</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: TSC2</td></tr>
- <tr><td width="40%">Theora</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libtheora</td></tr>
- <tr><td width="40%">Tiertex Limited SEQ video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in DOS CD-ROM FlashBack game.</td></tr>
- <tr><td width="40%">Ut Video</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">v210 QuickTime uncompressed 4:2:2 10-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">v308 QuickTime uncompressed 4:4:4</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">v408 QuickTime uncompressed 4:4:4:4</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">v410 QuickTime uncompressed 4:4:4 10-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">VBLE Lossless Codec</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">vMix Video</td><td width="10%"></td><td width="10%">X</td><td width="40%">fourcc: ’VMX1’</td></tr>
- <tr><td width="40%">VMware Screen Codec / VMware Video</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in videos captured by VMware.</td></tr>
- <tr><td width="40%">Westwood Studios VQA (Vector Quantized Animation) video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Image</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Video 7</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Video 8</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Video 9</td><td width="10%"></td><td width="10%">X</td><td width="40%">not completely working</td></tr>
- <tr><td width="40%">Wing Commander III / Xan</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Wing Commander III .MVE files.</td></tr>
- <tr><td width="40%">Wing Commander IV / Xan</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Wing Commander IV.</td></tr>
- <tr><td width="40%">Winnov WNV1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">WMV7</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">YAMAHA SMAF</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Psygnosis YOP Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">yuv4</td><td width="10%">X</td><td width="10%">X</td><td width="40%">libquicktime uncompressed packed 4:2:0</td></tr>
- <tr><td width="40%">ZeroCodec Lossless Video</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ZLIB</td><td width="10%">X</td><td width="10%">X</td><td width="40%">part of LCL, encoder experimental</td></tr>
- <tr><td width="40%">Zip Motion Blocks Video</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Encoder works only in PAL8.</td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that the feature in that column (encoding / decoding) is supported.
- </p>
- <p><code class="code">E</code> means that support is provided through an external library.
- </p>
- <a name="Audio-Codecs"></a>
- <h3 class="section">51.4 Audio Codecs<span class="pull-right"><a class="anchor hidden-xs" href="#Audio-Codecs" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Audio-Codecs" aria-hidden="true">TOC</a></span></h3>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Encoding</td><td width="10%">Decoding</td><td width="40%">Comments</td></tr>
- <tr><td width="40%">8SVX exponential</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">8SVX fibonacci</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">AAC</td><td width="10%">EX</td><td width="10%">X</td><td width="40%">encoding supported through internal encoder and external library libfdk-aac</td></tr>
- <tr><td width="40%">AAC+</td><td width="10%">E</td><td width="10%">IX</td><td width="40%">encoding supported through external library libfdk-aac</td></tr>
- <tr><td width="40%">AC-3</td><td width="10%">IX</td><td width="10%">IX</td></tr>
- <tr><td width="40%">ACELP.KELVIN</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM 4X Movie</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Yamaha AICA</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM AmuseGraphics Movie</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Argonaut Games</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM CDROM XA</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Creative Technology</td><td width="10%"></td><td width="10%">X</td><td width="40%">16 -> 4, 8 -> 4, 8 -> 3, 8 -> 2</td></tr>
- <tr><td width="40%">ADPCM Electronic Arts</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in various EA titles.</td></tr>
- <tr><td width="40%">ADPCM Electronic Arts Maxis CDROM XS</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Sim City 3000.</td></tr>
- <tr><td width="40%">ADPCM Electronic Arts R1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Electronic Arts R2</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Electronic Arts R3</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Electronic Arts XAS</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM G.722</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM G.726</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Acorn Replay</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA AMV</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in AMV files</td></tr>
- <tr><td width="40%">ADPCM IMA Cunning Developments</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Electronic Arts EACS</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Electronic Arts SEAD</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Funcom</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA High Voltage Software ALP</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Mobiclip MOFLEX</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA QuickTime</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Simon & Schuster Interactive</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Ubisoft APM</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Loki SDL MJPEG</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA WAV</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Westwood</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM ISS IMA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in FunCom games.</td></tr>
- <tr><td width="40%">ADPCM IMA Dialogic</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Duck DK3</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in some Sega Saturn console games.</td></tr>
- <tr><td width="40%">ADPCM IMA Duck DK4</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in some Sega Saturn console games.</td></tr>
- <tr><td width="40%">ADPCM IMA Radical</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM IMA Xbox</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Microsoft</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM MS IMA</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Nintendo Gamecube AFC</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Nintendo Gamecube DTK</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Nintendo THP</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Playstation</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM QT IMA</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Sanyo</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM SEGA CRI ADX</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Sega Dreamcast games.</td></tr>
- <tr><td width="40%">ADPCM Shockwave Flash</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Sound Blaster Pro 2-bit</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Sound Blaster Pro 2.6-bit</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Sound Blaster Pro 4-bit</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM VIMA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in LucasArts SMUSH animations.</td></tr>
- <tr><td width="40%">ADPCM Konami XMD</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Westwood Studios IMA</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Westwood Studios games like Command and Conquer.</td></tr>
- <tr><td width="40%">ADPCM Yamaha</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">ADPCM Zork</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">AMR-NB</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libopencore-amrnb</td></tr>
- <tr><td width="40%">AMR-WB</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libvo-amrwbenc</td></tr>
- <tr><td width="40%">Amazing Studio PAF Audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Apple lossless audio</td><td width="10%">X</td><td width="10%">X</td><td width="40%">QuickTime fourcc ’alac’</td></tr>
- <tr><td width="40%">aptX</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Bluetooth A2DP</td></tr>
- <tr><td width="40%">aptX HD</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Bluetooth A2DP</td></tr>
- <tr><td width="40%">ATRAC1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ATRAC3</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ATRAC3+</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">ATRAC9</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Bink Audio</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Bink and Smacker files in many games.</td></tr>
- <tr><td width="40%">Bonk audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">CELT</td><td width="10%"></td><td width="10%">E</td><td width="40%">decoding supported through external library libcelt</td></tr>
- <tr><td width="40%">codec2</td><td width="10%">E</td><td width="10%">E</td><td width="40%">en/decoding supported through external library libcodec2</td></tr>
- <tr><td width="40%">CRI HCA</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Delphine Software International CIN audio</td><td width="10%"></td><td width="10%">X</td><td width="40%">Codec used in Delphine Software International games.</td></tr>
- <tr><td width="40%">DFPWM</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Digital Speech Standard - Standard Play mode (DSS SP)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Discworld II BMV Audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">COOK</td><td width="10%"></td><td width="10%">X</td><td width="40%">All versions except 5.1 are supported.</td></tr>
- <tr><td width="40%">DCA (DTS Coherent Acoustics)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">supported extensions: XCh, XXCH, X96, XBR, XLL, LBR (partially)</td></tr>
- <tr><td width="40%">Dolby E</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DPCM Cuberoot-Delta-Exact</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in few games.</td></tr>
- <tr><td width="40%">DPCM Gremlin</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DPCM id RoQ</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Quake III, Jedi Knight 2 and other computer games.</td></tr>
- <tr><td width="40%">DPCM Marble WADY</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DPCM Interplay</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in various Interplay computer games.</td></tr>
- <tr><td width="40%">DPCM Squareroot-Delta-Exact</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in various games.</td></tr>
- <tr><td width="40%">DPCM Sierra Online</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Sierra Online game audio files.</td></tr>
- <tr><td width="40%">DPCM Sol</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DPCM Xan</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Origin’s Wing Commander IV AVI files.</td></tr>
- <tr><td width="40%">DPCM Xilam DERF</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DSD (Direct Stream Digital), least significant bit first</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DSD (Direct Stream Digital), most significant bit first</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DSD (Direct Stream Digital), least significant bit first, planar</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DSD (Direct Stream Digital), most significant bit first, planar</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DSP Group TrueSpeech</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DST (Direct Stream Transfer)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DV audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Enhanced AC-3</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">EVRC (Enhanced Variable Rate Codec)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">FLAC (Free Lossless Audio Codec)</td><td width="10%">X</td><td width="10%">IX</td></tr>
- <tr><td width="40%">FTR Voice</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">G.723.1</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">G.728</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">G.729</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">GSM</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libgsm</td></tr>
- <tr><td width="40%">GSM Microsoft variant</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libgsm</td></tr>
- <tr><td width="40%">IAC (Indeo Audio Coder)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">iLBC (Internet Low Bitrate Codec)</td><td width="10%">E</td><td width="10%">EX</td><td width="40%">encoding and decoding supported through external library libilbc</td></tr>
- <tr><td width="40%">IMC (Intel Music Coder)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Interplay ACM</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">LC3</td><td width="10%">E</td><td width="10%">E</td><td width="40%">supported through external library liblc3</td></tr>
- <tr><td width="40%">MACE (Macintosh Audio Compression/Expansion) 6:1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Marian’s A-pac audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MI-SC4 (Micronas SC-4 Audio)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MLP (Meridian Lossless Packing)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in DVD-Audio discs.</td></tr>
- <tr><td width="40%">Monkey’s Audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MP1 (MPEG audio layer 1)</td><td width="10%"></td><td width="10%">IX</td></tr>
- <tr><td width="40%">MP2 (MPEG audio layer 2)</td><td width="10%">IX</td><td width="10%">IX</td><td width="40%">encoding supported also through external library TwoLAME</td></tr>
- <tr><td width="40%">MP3 (MPEG audio layer 3)</td><td width="10%">E</td><td width="10%">IX</td><td width="40%">encoding supported through external library LAME, ADU MP3 and MP3onMP4 also supported</td></tr>
- <tr><td width="40%">MPEG-4 Audio Lossless Coding (ALS)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG-H 3D Audio</td><td width="10%"></td><td width="10%">E</td><td width="40%">decoding supported through external library libmpeghdec</td></tr>
- <tr><td width="40%">MobiClip FastAudio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Musepack SV7</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Musepack SV8</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Nellymoser Asao</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">On2 AVC (Audio for Video Codec)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Opus</td><td width="10%">E</td><td width="10%">X</td><td width="40%">encoding supported through external library libopus</td></tr>
- <tr><td width="40%">OSQ (Original Sound Quality)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM A-law</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM mu-law</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM Archimedes VIDC</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 8-bit planar</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 16-bit big-endian planar</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 16-bit little-endian planar</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 24-bit little-endian planar</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 32-bit little-endian planar</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM 32-bit floating point big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM 32-bit floating point little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM 64-bit floating point big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM 64-bit floating point little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM D-Cinema audio signed 24-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 8-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 16-bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 16-bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 24-bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 24-bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 32-bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 32-bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM signed 16/20/24-bit big-endian in MPEG-TS</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 8-bit</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 16-bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 16-bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 24-bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 24-bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 32-bit big-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM unsigned 32-bit little-endian</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PCM SGA</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">QCELP / PureVoice</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">QDesign Music Codec 1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">QDesign Music Codec 2</td><td width="10%"></td><td width="10%">X</td><td width="40%">There are still some distortions.</td></tr>
- <tr><td width="40%">RealAudio 1.0 (14.4K)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Real 14400 bit/s codec</td></tr>
- <tr><td width="40%">RealAudio 2.0 (28.8K)</td><td width="10%"></td><td width="10%">X</td><td width="40%">Real 28800 bit/s codec</td></tr>
- <tr><td width="40%">RealAudio 3.0 (dnet)</td><td width="10%">IX</td><td width="10%">X</td><td width="40%">Real low bitrate AC-3 codec</td></tr>
- <tr><td width="40%">RealAudio Lossless</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RealAudio SIPR / ACELP.NET</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RK Audio (RKA)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SBC (low-complexity subband codec)</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in Bluetooth A2DP</td></tr>
- <tr><td width="40%">Shorten</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Sierra VMD audio</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in Sierra VMD files.</td></tr>
- <tr><td width="40%">Smacker audio</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SMPTE 302M AES3 audio</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Sonic</td><td width="10%">X</td><td width="10%">X</td><td width="40%">experimental codec</td></tr>
- <tr><td width="40%">Sonic lossless</td><td width="10%">X</td><td width="10%">X</td><td width="40%">experimental codec</td></tr>
- <tr><td width="40%">Speex</td><td width="10%">E</td><td width="10%">EX</td><td width="40%">supported through external library libspeex</td></tr>
- <tr><td width="40%">TAK (Tom’s lossless Audio Kompressor)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">True Audio (TTA)</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">TrueHD</td><td width="10%">X</td><td width="10%">X</td><td width="40%">Used in HD-DVD and Blu-Ray discs.</td></tr>
- <tr><td width="40%">TwinVQ (VQF flavor)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">VIMA</td><td width="10%"></td><td width="10%">X</td><td width="40%">Used in LucasArts SMUSH animations.</td></tr>
- <tr><td width="40%">ViewQuest VQC</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Vorbis</td><td width="10%">E</td><td width="10%">X</td><td width="40%">A native but very primitive encoder exists.</td></tr>
- <tr><td width="40%">Voxware MetaSound</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Waveform Archiver</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">WavPack</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Westwood Audio (SND1)</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Audio 1</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Audio 2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Audio Lossless</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Audio Pro</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Windows Media Audio Voice</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Xbox Media Audio 1</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Xbox Media Audio 2</td><td width="10%"></td><td width="10%">X</td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that the feature in that column (encoding / decoding) is supported.
- </p>
- <p><code class="code">E</code> means that support is provided through an external library.
- </p>
- <p><code class="code">I</code> means that an integer-only version is available, too (ensures high
- performance on systems without hardware floating point support).
- </p>
- <a name="Subtitle-Formats"></a>
- <h3 class="section">51.5 Subtitle Formats<span class="pull-right"><a class="anchor hidden-xs" href="#Subtitle-Formats" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Subtitle-Formats" aria-hidden="true">TOC</a></span></h3>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Muxing</td><td width="10%">Demuxing</td><td width="10%">Encoding</td><td width="10%">Decoding</td></tr>
- <tr><td width="40%">3GPP Timed Text</td><td width="10%"></td><td width="10%"></td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">AQTitle</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DVB</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">DVB teletext</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">E</td></tr>
- <tr><td width="40%">DVD</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">JACOsub</td><td width="10%">X</td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MicroDVD</td><td width="10%">X</td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MPL2</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">MPsub (MPlayer)</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">PGS</td><td width="10%"></td><td width="10%"></td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">PJS (Phoenix)</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">RealText</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SAMI</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Spruce format (STL)</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SSA/ASS</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SubRip (SRT)</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SubViewer v1</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">SubViewer</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">TED Talks captions</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">TTML</td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">VobSub (IDX+SUB)</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">VPlayer</td><td width="10%"></td><td width="10%">X</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">WebVTT</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">XSUB</td><td width="10%"></td><td width="10%"></td><td width="10%">X</td><td width="10%">X</td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that the feature is supported.
- </p>
- <p><code class="code">E</code> means that support is provided through an external library.
- </p>
- <a name="Network-Protocols"></a>
- <h3 class="section">51.6 Network Protocols<span class="pull-right"><a class="anchor hidden-xs" href="#Network-Protocols" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Network-Protocols" aria-hidden="true">TOC</a></span></h3>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Support</td></tr>
- <tr><td width="40%">AMQP</td><td width="10%">E</td></tr>
- <tr><td width="40%">file</td><td width="10%">X</td></tr>
- <tr><td width="40%">FTP</td><td width="10%">X</td></tr>
- <tr><td width="40%">Gopher</td><td width="10%">X</td></tr>
- <tr><td width="40%">Gophers</td><td width="10%">X</td></tr>
- <tr><td width="40%">HLS</td><td width="10%">X</td></tr>
- <tr><td width="40%">HTTP</td><td width="10%">X</td></tr>
- <tr><td width="40%">HTTPS</td><td width="10%">X</td></tr>
- <tr><td width="40%">Icecast</td><td width="10%">X</td></tr>
- <tr><td width="40%">MMSH</td><td width="10%">X</td></tr>
- <tr><td width="40%">MMST</td><td width="10%">X</td></tr>
- <tr><td width="40%">pipe</td><td width="10%">X</td></tr>
- <tr><td width="40%">Pro-MPEG FEC</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMP</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMPE</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMPS</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMPT</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMPTE</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTMPTS</td><td width="10%">X</td></tr>
- <tr><td width="40%">RTP</td><td width="10%">X</td></tr>
- <tr><td width="40%">SAMBA</td><td width="10%">E</td></tr>
- <tr><td width="40%">SCTP</td><td width="10%">X</td></tr>
- <tr><td width="40%">SFTP</td><td width="10%">E</td></tr>
- <tr><td width="40%">TCP</td><td width="10%">X</td></tr>
- <tr><td width="40%">TLS</td><td width="10%">X</td></tr>
- <tr><td width="40%">UDP</td><td width="10%">X</td></tr>
- <tr><td width="40%">ZMQ</td><td width="10%">E</td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that the protocol is supported.
- </p>
- <p><code class="code">E</code> means that support is provided through an external library.
- </p>
- <a name="Input_002fOutput-Devices"></a>
- <h3 class="section">51.7 Input/Output Devices<span class="pull-right"><a class="anchor hidden-xs" href="#Input_002fOutput-Devices" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Input_002fOutput-Devices" aria-hidden="true">TOC</a></span></h3>
- <table class="multitable">
- <tbody><tr><td width="40%">Name</td><td width="10%">Input</td><td width="10%">Output</td></tr>
- <tr><td width="40%">ALSA</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">BKTR</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">caca</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">DV1394</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">Lavfi virtual device</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">Linux framebuffer</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">JACK</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">LIBCDIO</td><td width="10%">X</td></tr>
- <tr><td width="40%">LIBDC1394</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">OpenAL</td><td width="10%">X</td></tr>
- <tr><td width="40%">OpenGL</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">OSS</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">PulseAudio</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">SDL</td><td width="10%"></td><td width="10%">X</td></tr>
- <tr><td width="40%">Video4Linux2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">VfW capture</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">X11 grabbing</td><td width="10%">X</td><td width="10%"></td></tr>
- <tr><td width="40%">Win32 grabbing</td><td width="10%">X</td><td width="10%"></td></tr>
- </tbody>
- </table>
- <p><code class="code">X</code> means that input/output is supported.
- </p>
- <a name="Timecode"></a>
- <h3 class="section">51.8 Timecode<span class="pull-right"><a class="anchor hidden-xs" href="#Timecode" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Timecode" aria-hidden="true">TOC</a></span></h3>
- <table class="multitable">
- <tbody><tr><td width="40%">Codec/format</td><td width="10%">Read</td><td width="10%">Write</td></tr>
- <tr><td width="40%">AVI</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">DV</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">GXF</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MOV</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MPEG1/2</td><td width="10%">X</td><td width="10%">X</td></tr>
- <tr><td width="40%">MXF</td><td width="10%">X</td><td width="10%">X</td></tr>
- </tbody>
- </table>
- <a name="See-Also"></a>
- <h2 class="chapter">52 See Also<span class="pull-right"><a class="anchor hidden-xs" href="#See-Also" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-See-Also" aria-hidden="true">TOC</a></span></h2>
- <p><a class="url" href="ffmpeg.html">ffmpeg</a>
- <a class="url" href="ffplay.html">ffplay</a>, <a class="url" href="ffprobe.html">ffprobe</a>,
- <a class="url" href="ffmpeg-utils.html">ffmpeg-utils</a>,
- <a class="url" href="ffmpeg-scaler.html">ffmpeg-scaler</a>,
- <a class="url" href="ffmpeg-resampler.html">ffmpeg-resampler</a>,
- <a class="url" href="ffmpeg-codecs.html">ffmpeg-codecs</a>,
- <a class="url" href="ffmpeg-bitstream-filters.html">ffmpeg-bitstream-filters</a>,
- <a class="url" href="ffmpeg-formats.html">ffmpeg-formats</a>,
- <a class="url" href="ffmpeg-devices.html">ffmpeg-devices</a>,
- <a class="url" href="ffmpeg-protocols.html">ffmpeg-protocols</a>,
- <a class="url" href="ffmpeg-filters.html">ffmpeg-filters</a>
- </p>
- <a name="Authors"></a>
- <h2 class="chapter">53 Authors<span class="pull-right"><a class="anchor hidden-xs" href="#Authors" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Authors" aria-hidden="true">TOC</a></span></h2>
- <p>The FFmpeg developers.
- </p>
- <p>For details about the authorship, see the Git history of the project
- (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
- <code class="command">git log</code> in the FFmpeg source directory, or browsing the
- online repository at <a class="url" href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</a>.
- </p>
- <p>Maintainers for the specific components are listed in the file
- <samp class="file">MAINTAINERS</samp> in the source code tree.
- </p>
- <p style="font-size: small;">
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