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wang-bin
54 lines
2.1 KiB
Markdown
54 lines
2.1 KiB
Markdown
## FFmpeg Build Script
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I write a script to simplify the build. The script is in QtAV/scripts/build_ffmpeg.sh. It supports mingw gcc, msvc(2013), android, maemo5, maemo6(meego), sailfish os etc. Just put the script in ffmpeg source tree and run
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./build_ffmpeg.sh
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To cross build for android, maemo etc, you have to set some vars, for example NDK_ROOT for android. The vars can be set in config-android.sh, config-maemo5.sh etc.
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#### Install
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make install prefix=some_dir
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ref: http://ffmpeg.org/platform.html#Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows
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## Build with VC
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Open vs prompt, go to msys' bin dir and run
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sh --login -i
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Then your are ready to use bash environment and with VC environment. Then go to ffmpeg source dir and run './build_ffmpeg.sh vc'
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if get error about gawk, just ignore `make -ki`
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## Additional Tools for Windows
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Your msys may lack of some command line tools that ffmpeg build system needs, such as pr, od, install, pkg-config, nasm. You can download one of build-ffmpeg-win-additinal-tools_msys2/gnuwin32.7z here: https://sourceforge.net/projects/qtav/files/depends/
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extract and append it's bin dir to PATH. then you can build ffmpeg with gcc or vc.
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If you build with vc and not vs2013, you have to download [c99wrap](https://github.com/libav/c99-to-c89/)
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## Use MinGW libraries in VC
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If we build FFmpeg using mingw gcc, the `*,lib` are also created and installed in /usr/local/bin. So VC linker can use those. `*,lib` are generated by vc toolchain's `lib.exe` and `link.exe` if they are found. Otherwise `dlltool` is used. You may need additional link flag `/SAFESEH:NO` when linking to libs created by dlltool to avoid link error.
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If gcc does not create `*.lib`, for example, portaudio, then you can do it yourself.
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dlltool -m i386 -d libportaudio-2.dll.def -l portaudio.lib -D libportaudio-2.dll
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the def file can be found in lib/.lib for portaudio
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## Build PortAudio
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cmake is recommended. It's not difficult.
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## Build QtAV
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https://github.com/wang-bin/QtAV/wiki/Build-QtAV
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[prebuilt FFmpeg+portuaido](https://sourceforge.net/projects/qtav/files/depends) |