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# Building FFmpeg on Windows
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The script ffmpeg_build.sh allows compiling FFmpeg on Windows for the following targets :
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- Win32 using VS2010
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- Android arm/arm64/x86/x86_64/mips/mips64 using GCC.
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## Prerequisites
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- MSYS : http://www.mingw.org or MSYS2 (https://msys2.github.io/)
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- FFmpeg sources : get the sources of a release from https://github.com/FFmpeg/ (tested with 2.8.4)
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- YASM : http://yasm.tortall.net/Download.html (use a "Win32 .exe" release) (note : needs VC2010 redistributable)
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Rename the YASM executable to yasm.exe and put in in your PATH.
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To speed up the build, you can specify the number of parallel `make` jobs at line 37 in the script `ffmpeg_build.sh` :
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add `-j <number of jobs>` to the first `make` instruction.
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Note that this might not work with MSYS 1 (the one supplied with MinGW32).
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The script allows to build both release and debug versions of the library.
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## Building for Win32 with VS2013
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### Prerequisites
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- C99-to-C89 : https://github.com/libav/c99-to-c89/releases
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Needed because VS only supports C99 from version 2013 onwards.
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- msinttypes : https://code.google.com/p/msinttypes/
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For inttypes.h and possibly stdint.h if your VS doesn't already have it.
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Unzip C99-to-C89 and msinttypes to the same folder.
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Add this folder to your PATH and INCLUDE variables (create INCLUDE if needed).
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### Build
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Launch a Visual Studio shell (there should be a shortcut in your start menu).
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This opens a cmd window with pre-configured env variables that MSVC needs.
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From this shell, launch an MSYS shell (msys.bat).
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You can now close the initial VS shell.
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In the MSYS shell, make sure cl and link point to VS executables (`which cl`, `which link`).
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If it isn't the case : `export PATH="<path to your VS install>/VC/BIN":$PATH`
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Also check `which make` and if needed in msys2 use pacman commands to sync make.
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You can now build FFmpeg (use absolute paths to specify directories) :
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`./ffmpeg_build.sh win32 <debug/release> <ffmpeg sources dir> <build destination dir>`
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If the build fails because of mutliple int type declarations, remove stdint.h from the folder where you unpacked msinttypes.
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*Note* : You can't link a debug Scol build with a release FFmpeg build, and vice versa.
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## Building for Android
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### Prerequisites
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- Android NDK (tested with 10e)
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### Build
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In an MSYS shell, build FFmpeg with the desired options (use absolute paths to specify directories) :
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`./ffmpeg_build.sh android <debug/release> <ffmpeg sources dir> <build destination dir> <ANDROID_NDK_PATH> <ANDROID_TARGET_API> <ANDROID_TARGET_ABI> <GCC_VERSION>`
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