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  18. <a name="SEC_Top"></a>
  19. <div class="element-contents" id="SEC_Contents">
  20. <h2 class="contents-heading">Table of Contents</h2>
  21. <div class="contents">
  22. <ul class="toc-numbered-mark">
  23. <li><a id="toc-Unix_002dlike" href="#Unix_002dlike">1 Unix-like</a>
  24. <ul class="toc-numbered-mark">
  25. <li><a id="toc-Advanced-linking-configuration" href="#Advanced-linking-configuration">1.1 Advanced linking configuration</a></li>
  26. <li><a id="toc-BSD" href="#BSD">1.2 BSD</a></li>
  27. <li><a id="toc-_0028Open_0029Solaris" href="#g_t_0028Open_0029Solaris">1.3 (Open)Solaris</a></li>
  28. <li><a id="toc-Darwin-_0028Mac-OS-X_002c-iPhone_0029" href="#Darwin-_0028Mac-OS-X_002c-iPhone_0029">1.4 Darwin (Mac OS X, iPhone)</a></li>
  29. </ul></li>
  30. <li><a id="toc-DOS" href="#DOS">2 DOS</a></li>
  31. <li><a id="toc-OS_002f2" href="#OS_002f2">3 OS/2</a></li>
  32. <li><a id="toc-Windows" href="#Windows">4 Windows</a>
  33. <ul class="toc-numbered-mark">
  34. <li><a id="toc-Native-Windows-compilation-using-MinGW-or-MinGW_002dw64" href="#Native-Windows-compilation-using-MinGW-or-MinGW_002dw64">4.1 Native Windows compilation using MinGW or MinGW-w64</a>
  35. <ul class="toc-numbered-mark">
  36. <li><a id="toc-Native-Windows-compilation-using-MSYS2" href="#Native-Windows-compilation-using-MSYS2">4.1.1 Native Windows compilation using MSYS2</a></li>
  37. </ul></li>
  38. <li><a id="toc-Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows" href="#Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows">4.2 Microsoft Visual C++ or Intel C++ Compiler for Windows</a>
  39. <ul class="toc-numbered-mark">
  40. <li><a id="toc-Linking-to-FFmpeg-with-Microsoft-Visual-C_002b_002b" href="#Linking-to-FFmpeg-with-Microsoft-Visual-C_002b_002b">4.2.1 Linking to FFmpeg with Microsoft Visual C++</a></li>
  41. </ul></li>
  42. <li><a id="toc-Cross-compilation-for-Windows-with-Linux-1" href="#Cross-compilation-for-Windows-with-Linux-1">4.3 Cross compilation for Windows with Linux</a></li>
  43. <li><a id="toc-Compilation-under-Cygwin" href="#Compilation-under-Cygwin">4.4 Compilation under Cygwin</a></li>
  44. <li><a id="toc-Crosscompilation-for-Windows-under-Cygwin" href="#Crosscompilation-for-Windows-under-Cygwin">4.5 Crosscompilation for Windows under Cygwin</a></li>
  45. <li><a id="toc-ARM64EC" href="#ARM64EC">4.6 ARM64EC</a></li>
  46. </ul></li>
  47. </ul>
  48. </div>
  49. </div>
  50. <a name="Unix_002dlike"></a>
  51. <h2 class="chapter">1 Unix-like<span class="pull-right"><a class="anchor hidden-xs" href="#Unix_002dlike" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Unix_002dlike" aria-hidden="true">TOC</a></span></h2>
  52. <p>Some parts of FFmpeg cannot be built with version 2.15 of the GNU
  53. assembler which is still provided by a few AMD64 distributions. To
  54. make sure your compiler really uses the required version of gas
  55. after a binutils upgrade, run:
  56. </p>
  57. <div class="example">
  58. <pre class="example-preformatted">$(gcc -print-prog-name=as) --version
  59. </pre></div>
  60. <p>If not, then you should install a different compiler that has no
  61. hard-coded path to gas. In the worst case pass <code class="code">--disable-asm</code>
  62. to configure.
  63. </p>
  64. <a name="Advanced-linking-configuration"></a>
  65. <h3 class="section">1.1 Advanced linking configuration<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-linking-configuration" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-linking-configuration" aria-hidden="true">TOC</a></span></h3>
  66. <p>If you compiled FFmpeg libraries statically and you want to use them to
  67. build your own shared library, you may need to force PIC support (with
  68. <code class="code">--enable-pic</code> during FFmpeg configure) and add the following option
  69. to your project LDFLAGS:
  70. </p>
  71. <div class="example">
  72. <pre class="example-preformatted">-Wl,-Bsymbolic
  73. </pre></div>
  74. <p>If your target platform requires position independent binaries, you should
  75. pass the correct linking flag (e.g. <code class="code">-pie</code>) to <code class="code">--extra-ldexeflags</code>.
  76. </p>
  77. <a name="BSD"></a>
  78. <h3 class="section">1.2 BSD<span class="pull-right"><a class="anchor hidden-xs" href="#BSD" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-BSD" aria-hidden="true">TOC</a></span></h3>
  79. <p>BSD make will not build FFmpeg, you need to install and use GNU Make
  80. (<code class="command">gmake</code>).
  81. </p>
  82. <a name="g_t_0028Open_0029Solaris"></a>
  83. <h3 class="section">1.3 (Open)Solaris<span class="pull-right"><a class="anchor hidden-xs" href="#_0028Open_0029Solaris" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-_0028Open_0029Solaris" aria-hidden="true">TOC</a></span></h3>
  84. <p>GNU Make is required to build FFmpeg, so you have to invoke (<code class="command">gmake</code>),
  85. standard Solaris Make will not work. When building with a non-c99 front-end
  86. (gcc, generic suncc) add either <code class="code">--extra-libs=/usr/lib/values-xpg6.o</code>
  87. or <code class="code">--extra-libs=/usr/lib/64/values-xpg6.o</code> to the configure options
  88. since the libc is not c99-compliant by default. The probes performed by
  89. configure may raise an exception leading to the death of configure itself
  90. due to a bug in the system shell. Simply invoke a different shell such as
  91. bash directly to work around this:
  92. </p>
  93. <div class="example">
  94. <pre class="example-preformatted">bash ./configure
  95. </pre></div>
  96. <a class="anchor" id="Darwin"></a><a name="Darwin-_0028Mac-OS-X_002c-iPhone_0029"></a>
  97. <h3 class="section">1.4 Darwin (Mac OS X, iPhone)<span class="pull-right"><a class="anchor hidden-xs" href="#Darwin-_0028Mac-OS-X_002c-iPhone_0029" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Darwin-_0028Mac-OS-X_002c-iPhone_0029" aria-hidden="true">TOC</a></span></h3>
  98. <p>The toolchain provided with Xcode is sufficient to build the basic
  99. unaccelerated code.
  100. </p>
  101. <p>Mac OS X on PowerPC or ARM (iPhone) requires a preprocessor from
  102. <a class="url" href="https://github.com/FFmpeg/gas-preprocessor">https://github.com/FFmpeg/gas-preprocessor</a> or
  103. <a class="url" href="https://github.com/yuvi/gas-preprocessor">https://github.com/yuvi/gas-preprocessor</a>(currently outdated) to build the optimized
  104. assembly functions. Put the Perl script somewhere
  105. in your PATH, FFmpeg&rsquo;s configure will pick it up automatically.
  106. </p>
  107. <p>Mac OS X on amd64 and x86 requires <code class="command">nasm</code> to build most of the
  108. optimized assembly functions. <a class="uref" href="http://www.finkproject.org/">Fink</a>,
  109. <a class="uref" href="https://wiki.gentoo.org/wiki/Project:Prefix">Gentoo Prefix</a>,
  110. <a class="uref" href="https://mxcl.github.com/homebrew/">Homebrew</a>
  111. or <a class="uref" href="http://www.macports.org">MacPorts</a> can easily provide it.
  112. </p>
  113. <a name="DOS"></a>
  114. <h2 class="chapter">2 DOS<span class="pull-right"><a class="anchor hidden-xs" href="#DOS" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-DOS" aria-hidden="true">TOC</a></span></h2>
  115. <p>Using a cross-compiler is preferred for various reasons.
  116. <a class="url" href="http://www.delorie.com/howto/djgpp/linux-x-djgpp.html">http://www.delorie.com/howto/djgpp/linux-x-djgpp.html</a>
  117. </p>
  118. <a name="OS_002f2"></a>
  119. <h2 class="chapter">3 OS/2<span class="pull-right"><a class="anchor hidden-xs" href="#OS_002f2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-OS_002f2" aria-hidden="true">TOC</a></span></h2>
  120. <p>For information about compiling FFmpeg on OS/2 see
  121. <a class="url" href="http://www.edm2.com/index.php/FFmpeg">http://www.edm2.com/index.php/FFmpeg</a>.
  122. </p>
  123. <a name="Windows"></a>
  124. <h2 class="chapter">4 Windows<span class="pull-right"><a class="anchor hidden-xs" href="#Windows" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Windows" aria-hidden="true">TOC</a></span></h2>
  125. <a name="Native-Windows-compilation-using-MinGW-or-MinGW_002dw64"></a>
  126. <h3 class="section">4.1 Native Windows compilation using MinGW or MinGW-w64<span class="pull-right"><a class="anchor hidden-xs" href="#Native-Windows-compilation-using-MinGW-or-MinGW_002dw64" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Native-Windows-compilation-using-MinGW-or-MinGW_002dw64" aria-hidden="true">TOC</a></span></h3>
  127. <p>FFmpeg can be built to run natively on Windows using the MinGW-w64
  128. toolchain. Install the latest versions of MSYS2 and MinGW-w64 from
  129. <a class="url" href="http://msys2.github.io/">http://msys2.github.io/</a> and/or <a class="url" href="http://mingw-w64.sourceforge.net/">http://mingw-w64.sourceforge.net/</a>.
  130. You can find detailed installation instructions in the download section and
  131. the FAQ.
  132. </p>
  133. <p>Notes:
  134. </p>
  135. <ul class="itemize mark-bullet">
  136. <li>Building for the MSYS environment is discouraged, MSYS2 provides a full
  137. MinGW-w64 environment through <samp class="file">mingw64_shell.bat</samp> or
  138. <samp class="file">mingw32_shell.bat</samp> that should be used instead of the environment
  139. provided by <samp class="file">msys2_shell.bat</samp>.
  140. </li><li>Building using MSYS2 can be sped up by disabling implicit rules in the
  141. Makefile by calling <code class="code">make -r</code> instead of plain <code class="code">make</code>. This
  142. speed up is close to non-existent for normal one-off builds and is only
  143. noticeable when running make for a second time (for example during
  144. <code class="code">make install</code>).
  145. </li><li>In order to compile FFplay, you must have the MinGW development library
  146. of <a class="uref" href="http://www.libsdl.org/">SDL</a> and <code class="code">pkg-config</code> installed.
  147. </li><li>By using <code class="code">./configure --enable-shared</code> when configuring FFmpeg,
  148. you can build the FFmpeg libraries (e.g. libavutil, libavcodec,
  149. libavformat) as DLLs.
  150. </li></ul>
  151. <a name="Native-Windows-compilation-using-MSYS2"></a>
  152. <h4 class="subsection">4.1.1 Native Windows compilation using MSYS2<span class="pull-right"><a class="anchor hidden-xs" href="#Native-Windows-compilation-using-MSYS2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Native-Windows-compilation-using-MSYS2" aria-hidden="true">TOC</a></span></h4>
  153. <p>The MSYS2 MinGW-w64 environment provides ready to use toolchains and dependencies
  154. through <code class="command">pacman</code>.
  155. </p>
  156. <p>Make sure to use <samp class="file">mingw64_shell.bat</samp> or <samp class="file">mingw32_shell.bat</samp> to have
  157. the correct MinGW-w64 environment. The default install provides shortcuts to
  158. them under <code class="command">MinGW-w64 Win64 Shell</code> and <code class="command">MinGW-w64 Win32 Shell</code>.
  159. </p>
  160. <div class="example">
  161. <pre class="example-preformatted"># normal msys2 packages
  162. pacman -S make pkgconf diffutils
  163. # mingw-w64 packages and toolchains
  164. pacman -S mingw-w64-x86_64-nasm mingw-w64-x86_64-gcc mingw-w64-x86_64-SDL2
  165. </pre></div>
  166. <p>To target 32 bits replace <code class="code">x86_64</code> with <code class="code">i686</code> in the command above.
  167. </p>
  168. <a name="Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows"></a>
  169. <h3 class="section">4.2 Microsoft Visual C++ or Intel C++ Compiler for Windows<span class="pull-right"><a class="anchor hidden-xs" href="#Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows" aria-hidden="true">TOC</a></span></h3>
  170. <p>FFmpeg can be built with MSVC 2013 or later.
  171. </p>
  172. <p>You will need the following prerequisites:
  173. </p>
  174. <ul class="itemize mark-bullet">
  175. <li><a class="uref" href="http://msys2.github.io/">MSYS2</a>
  176. </li><li><a class="uref" href="http://www.nasm.us/">NASM</a>
  177. (Also available via MSYS2&rsquo;s package manager.)
  178. </li></ul>
  179. <p>To set up a proper environment in MSYS2, you need to run <code class="code">msys_shell.bat</code> from
  180. the Visual Studio or Intel Compiler command prompt.
  181. </p>
  182. <p>Place <code class="code">nasm.exe</code> somewhere in your <code class="code">PATH</code>.
  183. </p>
  184. <p>Next, make sure any other headers and libs you want to use, such as zlib, are
  185. located in a spot that the compiler can see. Do so by modifying the <code class="code">LIB</code>
  186. and <code class="code">INCLUDE</code> environment variables to include the <strong class="strong">Windows-style</strong>
  187. paths to these directories. Alternatively, you can try to use the
  188. <code class="code">--extra-cflags</code>/<code class="code">--extra-ldflags</code> configure options.
  189. </p>
  190. <p>Finally, run:
  191. </p>
  192. <div class="example">
  193. <pre class="example-preformatted">For MSVC:
  194. ./configure --toolchain=msvc
  195. For ICL:
  196. ./configure --toolchain=icl
  197. make
  198. make install
  199. </pre></div>
  200. <p>If you wish to compile shared libraries, add <code class="code">--enable-shared</code> to your
  201. configure options. Note that due to the way MSVC and ICL handle DLL imports and
  202. exports, you cannot compile static and shared libraries at the same time, and
  203. enabling shared libraries will automatically disable the static ones.
  204. </p>
  205. <p>Notes:
  206. </p>
  207. <ul class="itemize mark-bullet">
  208. <li>If you wish to build with zlib support, you will have to grab a compatible
  209. zlib binary from somewhere, with an MSVC import lib, or if you wish to link
  210. statically, you can follow the instructions below to build a compatible
  211. <code class="code">zlib.lib</code> with MSVC. Regardless of which method you use, you must still
  212. follow step 3, or compilation will fail.
  213. <ol class="enumerate">
  214. <li> Grab the <a class="uref" href="http://zlib.net/">zlib sources</a>.
  215. </li><li> Edit <code class="code">win32/Makefile.msc</code> so that it uses -MT instead of -MD, since
  216. this is how FFmpeg is built as well.
  217. </li><li> Edit <code class="code">zconf.h</code> and remove its inclusion of <code class="code">unistd.h</code>. This gets
  218. erroneously included when building FFmpeg.
  219. </li><li> Run <code class="code">nmake -f win32/Makefile.msc</code>.
  220. </li><li> Move <code class="code">zlib.lib</code>, <code class="code">zconf.h</code>, and <code class="code">zlib.h</code> to somewhere MSVC
  221. can see.
  222. </li></ol>
  223. </li><li>FFmpeg has been tested with the following on i686 and x86_64:
  224. <ul class="itemize mark-bullet">
  225. <li>Visual Studio 2013 Pro and Express
  226. </li><li>Intel Composer XE 2013
  227. </li><li>Intel Composer XE 2013 SP1
  228. </li></ul>
  229. <p>Anything else is not officially supported.
  230. </p>
  231. </li></ul>
  232. <a name="Linking-to-FFmpeg-with-Microsoft-Visual-C_002b_002b"></a>
  233. <h4 class="subsection">4.2.1 Linking to FFmpeg with Microsoft Visual C++<span class="pull-right"><a class="anchor hidden-xs" href="#Linking-to-FFmpeg-with-Microsoft-Visual-C_002b_002b" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Linking-to-FFmpeg-with-Microsoft-Visual-C_002b_002b" aria-hidden="true">TOC</a></span></h4>
  234. <p>If you plan to link with MSVC-built static libraries, you will need
  235. to make sure you have <code class="code">Runtime Library</code> set to
  236. <code class="code">Multi-threaded (/MT)</code> in your project&rsquo;s settings.
  237. </p>
  238. <p>You will need to define <code class="code">inline</code> to something MSVC understands:
  239. </p><div class="example">
  240. <pre class="example-preformatted">#define inline __inline
  241. </pre></div>
  242. <p>Also note, that as stated in <strong class="strong">Microsoft Visual C++</strong>, you will need
  243. an MSVC-compatible <a class="uref" href="http://code.google.com/p/msinttypes/">inttypes.h</a>.
  244. </p>
  245. <p>If you plan on using import libraries created by dlltool, you must
  246. set <code class="code">References</code> to <code class="code">No (/OPT:NOREF)</code> under the linker optimization
  247. settings, otherwise the resulting binaries will fail during runtime.
  248. This is not required when using import libraries generated by <code class="code">lib.exe</code>.
  249. This issue is reported upstream at
  250. <a class="url" href="http://sourceware.org/bugzilla/show_bug.cgi?id=12633">http://sourceware.org/bugzilla/show_bug.cgi?id=12633</a>.
  251. </p>
  252. <p>To create import libraries that work with the <code class="code">/OPT:REF</code> option
  253. (which is enabled by default in Release mode), follow these steps:
  254. </p>
  255. <ol class="enumerate">
  256. <li> Open the <em class="emph">Visual Studio Command Prompt</em>.
  257. <p>Alternatively, in a normal command line prompt, call <samp class="file">vcvars32.bat</samp>
  258. which sets up the environment variables for the Visual C++ tools
  259. (the standard location for this file is something like
  260. <samp class="file">C:\Program Files (x86_\Microsoft Visual Studio 10.0\VC\bin\vcvars32.bat</samp>).
  261. </p>
  262. </li><li> Enter the <samp class="file">bin</samp> directory where the created LIB and DLL files
  263. are stored.
  264. </li><li> Generate new import libraries with <code class="command">lib.exe</code>:
  265. <div class="example">
  266. <pre class="example-preformatted">lib /machine:i386 /def:..\lib\foo-version.def /out:foo.lib
  267. </pre></div>
  268. <p>Replace <code class="code">foo-version</code> and <code class="code">foo</code> with the respective library names.
  269. </p>
  270. </li></ol>
  271. <a class="anchor" id="Cross-compilation-for-Windows-with-Linux"></a><a name="Cross-compilation-for-Windows-with-Linux-1"></a>
  272. <h3 class="section">4.3 Cross compilation for Windows with Linux<span class="pull-right"><a class="anchor hidden-xs" href="#Cross-compilation-for-Windows-with-Linux-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Cross-compilation-for-Windows-with-Linux-1" aria-hidden="true">TOC</a></span></h3>
  273. <p>You must use the MinGW cross compilation tools available at
  274. <a class="url" href="http://www.mingw.org/">http://www.mingw.org/</a>.
  275. </p>
  276. <p>Then configure FFmpeg with the following options:
  277. </p><div class="example">
  278. <pre class="example-preformatted">./configure --target-os=mingw32 --cross-prefix=i386-mingw32msvc-
  279. </pre></div>
  280. <p>(you can change the cross-prefix according to the prefix chosen for the
  281. MinGW tools).
  282. </p>
  283. <p>Then you can easily test FFmpeg with <a class="uref" href="http://www.winehq.com/">Wine</a>.
  284. </p>
  285. <a name="Compilation-under-Cygwin"></a>
  286. <h3 class="section">4.4 Compilation under Cygwin<span class="pull-right"><a class="anchor hidden-xs" href="#Compilation-under-Cygwin" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Compilation-under-Cygwin" aria-hidden="true">TOC</a></span></h3>
  287. <p>Please use Cygwin 1.7.x as the obsolete 1.5.x Cygwin versions lack
  288. llrint() in its C library.
  289. </p>
  290. <p>Install your Cygwin with all the &quot;Base&quot; packages, plus the
  291. following &quot;Devel&quot; ones:
  292. </p><div class="example">
  293. <pre class="example-preformatted">binutils, gcc4-core, make, git, mingw-runtime, texinfo
  294. </pre></div>
  295. <p>In order to run FATE you will also need the following &quot;Utils&quot; packages:
  296. </p><div class="example">
  297. <pre class="example-preformatted">diffutils
  298. </pre></div>
  299. <p>If you want to build FFmpeg with additional libraries, download Cygwin
  300. &quot;Devel&quot; packages for Ogg and Vorbis from any Cygwin packages repository:
  301. </p><div class="example">
  302. <pre class="example-preformatted">libogg-devel, libvorbis-devel
  303. </pre></div>
  304. <p>These library packages are only available from
  305. <a class="uref" href="http://sourceware.org/cygwinports/">Cygwin Ports</a>:
  306. </p>
  307. <div class="example">
  308. <pre class="example-preformatted">libSDL-devel, libgsm-devel, libmp3lame-devel,
  309. speex-devel, libtheora-devel, libxvidcore-devel
  310. </pre></div>
  311. <p>The recommendation for x264 is to build it from source, as it evolves too
  312. quickly for Cygwin Ports to be up to date.
  313. </p>
  314. <a name="Crosscompilation-for-Windows-under-Cygwin"></a>
  315. <h3 class="section">4.5 Crosscompilation for Windows under Cygwin<span class="pull-right"><a class="anchor hidden-xs" href="#Crosscompilation-for-Windows-under-Cygwin" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Crosscompilation-for-Windows-under-Cygwin" aria-hidden="true">TOC</a></span></h3>
  316. <p>With Cygwin you can create Windows binaries that do not need the cygwin1.dll.
  317. </p>
  318. <p>Just install your Cygwin as explained before, plus these additional
  319. &quot;Devel&quot; packages:
  320. </p><div class="example">
  321. <pre class="example-preformatted">gcc-mingw-core, mingw-runtime, mingw-zlib
  322. </pre></div>
  323. <p>and add some special flags to your configure invocation.
  324. </p>
  325. <p>For a static build run
  326. </p><div class="example">
  327. <pre class="example-preformatted">./configure --target-os=mingw32 --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
  328. </pre></div>
  329. <p>and for a build with shared libraries
  330. </p><div class="example">
  331. <pre class="example-preformatted">./configure --target-os=mingw32 --enable-shared --disable-static --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
  332. </pre></div>
  333. <a name="ARM64EC"></a>
  334. <h3 class="section">4.6 ARM64EC<span class="pull-right"><a class="anchor hidden-xs" href="#ARM64EC" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-ARM64EC" aria-hidden="true">TOC</a></span></h3>
  335. <p>FFmpeg does not intend to support the Windows ARM64EC build configuration;
  336. patches for changing the individual libraries for the purposes of ARM64EC will
  337. not be accepted.
  338. </p>
  339. <p>It may still be possible to build FFmpeg in this build configuration;
  340. such a build may seem to work to some extent. Such a build may have some
  341. amounts of ABI inconsistencies though - which we are not willing to fix.
  342. </p>
  343. <p>(Changing aarch64 assembly code to strictly support ARM64EC would require
  344. ifdeffing/changing essentially all such assembly code, and would be a
  345. huge maintenance burden. Additionally, changing the library ABI
  346. surfaces to fix ABI inconsistencies could require extensive and intrusive
  347. changes.)
  348. </p>
  349. <p style="font-size: small;">
  350. This document was generated using <a class="uref" href="https://www.gnu.org/software/texinfo/"><em class="emph">makeinfo</em></a>.
  351. </p>
  352. </div>
  353. </body>
  354. </html>