1 \input texinfo @c -*- texinfo -*-
3 @settitle Platform Specific information
5 @center @titlefont{Platform Specific information}
14 Some parts of FFmpeg cannot be built with version 2.15 of the GNU
15 assembler which is still provided by a few AMD64 distributions. To
16 make sure your compiler really uses the required version of gas
17 after a binutils upgrade, run:
20 $(gcc -print-prog-name=as) --version
23 If not, then you should install a different compiler that has no
24 hard-coded path to gas. In the worst case pass @code{--disable-asm}
29 BSD make will not build FFmpeg, you need to install and use GNU Make
32 @section (Open)Solaris
34 GNU Make is required to build FFmpeg, so you have to invoke (@file{gmake}),
35 standard Solaris Make will not work. When building with a non-c99 front-end
36 (gcc, generic suncc) add either @code{--extra-libs=/usr/lib/values-xpg6.o}
37 or @code{--extra-libs=/usr/lib/64/values-xpg6.o} to the configure options
38 since the libc is not c99-compliant by default. The probes performed by
39 configure may raise an exception leading to the death of configure itself
40 due to a bug in the system shell. Simply invoke a different shell such as
41 bash directly to work around this:
48 @section Darwin (Mac OS X, iPhone)
50 The toolchain provided with Xcode is sufficient to build the basic
53 Mac OS X on PowerPC or ARM (iPhone) requires a preprocessor from
54 @url{http://github.com/yuvi/gas-preprocessor} to build the optimized
55 assembler functions. Just download the Perl script and put it somewhere
56 in your PATH, FFmpeg's configure will pick it up automatically.
58 Mac OS X on amd64 and x86 requires @command{yasm} to build most of the
59 optimized assembler functions. @uref{http://www.finkproject.org/, Fink},
60 @uref{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix},
61 @uref{http://mxcl.github.com/homebrew/, Homebrew}
62 or @uref{http://www.macports.org, MacPorts} can easily provide it.
67 Using a cross-compiler is preferred for various reasons.
68 @url{http://www.delorie.com/howto/djgpp/linux-x-djgpp.html}
73 For information about compiling FFmpeg on OS/2 see
74 @url{http://www.edm2.com/index.php/FFmpeg}.
79 To get help and instructions for building FFmpeg under Windows, check out
80 the FFmpeg Windows Help Forum at
81 @url{http://ffmpeg.arrozcru.org/}.
83 @section Native Windows compilation
85 FFmpeg can be built to run natively on Windows using the MinGW tools. Install
86 the latest versions of MSYS and MinGW from @url{http://www.mingw.org/}.
87 You can find detailed installation instructions in the download
90 FFmpeg does not build out-of-the-box with the packages the automated MinGW
91 installer provides. It also requires coreutils to be installed and many other
92 packages updated to the latest version. The minimum version for some packages
97 @item msys-make 3.81-2 (note: not mingw32-make)
99 @item mingw-runtime 3.15
102 FFmpeg automatically passes @code{-fno-common} to the compiler to work around
103 a GCC bug (see @url{http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216}).
109 @item Building natively using MSYS can be sped up by disabling implicit rules
110 in the Makefile by calling @code{make -r} instead of plain @code{make}. This
111 speed up is close to non-existent for normal one-off builds and is only
112 noticeable when running make for a second time (for example in
113 @code{make install}).
115 @item In order to compile FFplay, you must have the MinGW development library
116 of @uref{http://www.libsdl.org/, SDL}.
117 Edit the @file{bin/sdl-config} script so that it points to the correct prefix
118 where SDL was installed. Verify that @file{sdl-config} can be launched from
119 the MSYS command line.
121 @item By using @code{./configure --enable-shared} when configuring FFmpeg,
122 you can build the FFmpeg libraries (e.g. libavutil, libavcodec,
123 libavformat) as DLLs.
127 @section Microsoft Visual C++ compatibility
129 As stated in the FAQ, FFmpeg will not compile under MSVC++. However, if you
130 want to use the libav* libraries in your own applications, you can still
131 compile those applications using MSVC++. But the libav* libraries you link
132 to @emph{must} be built with MinGW. However, you will not be able to debug
133 inside the libav* libraries, since MSVC++ does not recognize the debug
134 symbols generated by GCC.
135 We strongly recommend you to move over from MSVC++ to MinGW tools.
137 This description of how to use the FFmpeg libraries with MSVC++ is based on
138 Microsoft Visual C++ 2005 Express Edition. If you have a different version,
139 you might have to modify the procedures slightly.
141 @subsection Using static libraries
143 Assuming you have just built and installed FFmpeg in @file{/usr/local}.
147 @item Create a new console application ("File / New / Project") and then
148 select "Win32 Console Application". On the appropriate page of the
149 Application Wizard, uncheck the "Precompiled headers" option.
151 @item Write the source code for your application, or, for testing, just
152 copy the code from an existing sample application into the source file
153 that MSVC++ has already created for you. For example, you can copy
154 @file{libavformat/output-example.c} from the FFmpeg distribution.
156 @item Open the "Project / Properties" dialog box. In the "Configuration"
157 combo box, select "All Configurations" so that the changes you make will
158 affect both debug and release builds. In the tree view on the left hand
159 side, select "C/C++ / General", then edit the "Additional Include
160 Directories" setting to contain the path where the FFmpeg includes were
161 installed (i.e. @file{c:\msys\1.0\local\include}).
162 Do not add MinGW's include directory here, or the include files will
163 conflict with MSVC's.
165 @item Still in the "Project / Properties" dialog box, select
166 "Linker / General" from the tree view and edit the
167 "Additional Library Directories" setting to contain the @file{lib}
168 directory where FFmpeg was installed (i.e. @file{c:\msys\1.0\local\lib}),
169 the directory where MinGW libs are installed (i.e. @file{c:\mingw\lib}),
170 and the directory where MinGW's GCC libs are installed
171 (i.e. @file{C:\mingw\lib\gcc\mingw32\4.2.1-sjlj}). Then select
172 "Linker / Input" from the tree view, and add the files @file{libavformat.a},
173 @file{libavcodec.a}, @file{libavutil.a}, @file{libmingwex.a},
174 @file{libgcc.a}, and any other libraries you used (i.e. @file{libz.a})
175 to the end of "Additional Dependencies".
177 @item Now, select "C/C++ / Code Generation" from the tree view. Select
178 "Debug" in the "Configuration" combo box. Make sure that "Runtime
179 Library" is set to "Multi-threaded Debug DLL". Then, select "Release" in
180 the "Configuration" combo box and make sure that "Runtime Library" is
181 set to "Multi-threaded DLL".
183 @item Click "OK" to close the "Project / Properties" dialog box.
185 @item MSVC++ lacks some C99 header files that are fundamental for FFmpeg.
186 Get msinttypes from @url{http://code.google.com/p/msinttypes/downloads/list}
187 and install it in MSVC++'s include directory
188 (i.e. @file{C:\Program Files\Microsoft Visual Studio 8\VC\include}).
190 @item MSVC++ also does not understand the @code{inline} keyword used by
191 FFmpeg, so you must add this line before @code{#include}ing libav*:
193 #define inline _inline
196 @item Build your application, everything should work.
200 @subsection Using shared libraries
202 This is how to create DLL and LIB files that are compatible with MSVC++:
206 @item Add a call to @file{vcvars32.bat} (which sets up the environment
207 variables for the Visual C++ tools) as the first line of @file{msys.bat}.
208 The standard location for @file{vcvars32.bat} is
209 @file{C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat},
210 and the standard location for @file{msys.bat} is @file{C:\msys\1.0\msys.bat}.
211 If this corresponds to your setup, add the following line as the first line
215 call "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat"
218 Alternatively, you may start the @file{Visual Studio 2005 Command Prompt},
219 and run @file{c:\msys\1.0\msys.bat} from there.
221 @item Within the MSYS shell, run @code{lib.exe}. If you get a help message
222 from @file{Microsoft (R) Library Manager}, this means your environment
223 variables are set up correctly, the @file{Microsoft (R) Library Manager}
224 is on the path and will be used by FFmpeg to create
225 MSVC++-compatible import libraries.
227 @item Build FFmpeg with
230 ./configure --enable-shared
235 Your install path (@file{/usr/local/} by default) should now have the
236 necessary DLL and LIB files under the @file{bin} directory.
240 Alternatively, build the libraries with a cross compiler, according to
241 the instructions below in @ref{Cross compilation for Windows with Linux}.
243 To use those files with MSVC++, do the same as you would do with
244 the static libraries, as described above. But in Step 4,
245 you should only need to add the directory where the LIB files are installed
246 (i.e. @file{c:\msys\usr\local\bin}). This is not a typo, the LIB files are
247 installed in the @file{bin} directory. And instead of adding the static
248 libraries (@file{libxxx.a} files) you should add the MSVC import libraries
249 (@file{avcodec.lib}, @file{avformat.lib}, and
250 @file{avutil.lib}). Note that you should not use the GCC import
251 libraries (@file{libxxx.dll.a} files), as these will give you undefined
252 reference errors. There should be no need for @file{libmingwex.a},
253 @file{libgcc.a}, and @file{wsock32.lib}, nor any other external library
254 statically linked into the DLLs.
256 FFmpeg headers do not declare global data for Windows DLLs through the usual
257 dllexport/dllimport interface. Such data will be exported properly while
258 building, but to use them in your MSVC++ code you will have to edit the
259 appropriate headers and mark the data as dllimport. For example, in
260 libavutil/pixdesc.h you should have:
262 extern __declspec(dllimport) const AVPixFmtDescriptor av_pix_fmt_descriptors[];
265 Note that using import libraries created by dlltool requires
266 the linker optimization option to be set to
267 "References: Keep Unreferenced Data (@code{/OPT:NOREF})", otherwise
268 the resulting binaries will fail during runtime. This isn't
269 required when using import libraries generated by lib.exe.
270 This issue is reported upstream at
271 @url{http://sourceware.org/bugzilla/show_bug.cgi?id=12633}.
273 To create import libraries that work with the @code{/OPT:REF} option
274 (which is enabled by default in Release mode), follow these steps:
278 @item Open @file{Visual Studio 2005 Command Prompt}.
280 Alternatively, in a normal command line prompt, call @file{vcvars32.bat}
281 which sets up the environment variables for the Visual C++ tools
282 (the standard location for this file is
283 @file{C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat}).
285 @item Enter the @file{bin} directory where the created LIB and DLL files
288 @item Generate new import libraries with @file{lib.exe}:
291 lib /machine:i386 /def:..\lib\avcodec-53.def /out:avcodec.lib
292 lib /machine:i386 /def:..\lib\avdevice-53.def /out:avdevice.lib
293 lib /machine:i386 /def:..\lib\avfilter-2.def /out:avfilter.lib
294 lib /machine:i386 /def:..\lib\avformat-53.def /out:avformat.lib
295 lib /machine:i386 /def:..\lib\avutil-51.def /out:avutil.lib
296 lib /machine:i386 /def:..\lib\swscale-2.def /out:swscale.lib
301 @anchor{Cross compilation for Windows with Linux}
302 @section Cross compilation for Windows with Linux
304 You must use the MinGW cross compilation tools available at
305 @url{http://www.mingw.org/}.
307 Then configure FFmpeg with the following options:
309 ./configure --target-os=mingw32 --cross-prefix=i386-mingw32msvc-
311 (you can change the cross-prefix according to the prefix chosen for the
314 Then you can easily test FFmpeg with @uref{http://www.winehq.com/, Wine}.
316 @section Compilation under Cygwin
318 Please use Cygwin 1.7.x as the obsolete 1.5.x Cygwin versions lack
319 llrint() in its C library.
321 Install your Cygwin with all the "Base" packages, plus the
322 following "Devel" ones:
324 binutils, gcc4-core, make, git, mingw-runtime, texi2html
327 And the following "Utils" one:
338 to make a static build.
340 The current @code{gcc4-core} package is buggy and needs this flag to build
344 ./configure --enable-shared --disable-static --extra-cflags=-fno-reorder-functions
347 If you want to build FFmpeg with additional libraries, download Cygwin
348 "Devel" packages for Ogg and Vorbis from any Cygwin packages repository:
350 libogg-devel, libvorbis-devel
353 These library packages are only available from
354 @uref{http://sourceware.org/cygwinports/, Cygwin Ports}:
357 yasm, libSDL-devel, libdirac-devel, libfaac-devel, libaacplus-devel, libgsm-devel,
358 libmp3lame-devel, libschroedinger1.0-devel, speex-devel, libtheora-devel,
362 The recommendation for libnut and x264 is to build them from source by
363 yourself, as they evolve too quickly for Cygwin Ports to be up to date.
365 Cygwin 1.7.x has IPv6 support. You can add IPv6 to Cygwin 1.5.x by means
366 of the @code{libgetaddrinfo-devel} package, available at Cygwin Ports.
368 @section Crosscompilation for Windows under Cygwin
370 With Cygwin you can create Windows binaries that do not need the cygwin1.dll.
372 Just install your Cygwin as explained before, plus these additional
375 gcc-mingw-core, mingw-runtime, mingw-zlib
378 and add some special flags to your configure invocation.
380 For a static build run
382 ./configure --target-os=mingw32 --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
385 and for a build with shared libraries
387 ./configure --target-os=mingw32 --enable-shared --disable-static --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin