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QtAV Build Configurations
Since QtAV 1.3.1, you can configure how to build QtAV in a easier way.
When running qmake, qmake will do some tests to check the building environment and the features can be enabled. The default behavior is to check all the features in both $$EssentialDepends and $$OptionalDepends(see QtAV.pro) and to build all parts in source tree including examples, tests. Now you can simply select what you want to check and build using a user.conf in QtAV source directory.
Currently features in $$EssentialDepends will always be checked: avutil, avcodec, avformat, swscale, swresample, avresample, gl. Features in $$OptionalDepends will also be checked by default.
Features in $$OptionalDepends can be disabled by adding a CONFIG value in QtAV_SRC_DIR/user.conf(create it if not exists). For example, to disable vaapi, just add:
CONFIG += no-vaapi
All options available are: no-openal, no-portaudio, no-direct2d, no-gdiplus, no-dxva, no-xv, no-vaapi, no-cedarv.
config.tests will check what features QtAV can support. It may takes a few seconds. Some you may skip these checking to save time. You can add
CONFIG += no_config_tests
in QtAV_SRC/user.conf to disable it then qmake will be faster. But you then must enable the features you want manually in user.conf. All features available are $$OptionalDepends. For example, to enable avresample, add
CONFIG += config_avresample
in user.conf.
It is supported since 1.4.2. You can add CONFIG += static_ffmpeg in QTAV_BUILD_DIR/.qmake.cache. Additional link flags will be added. Only ffmpeg build with QtAV/script/build_ffmpeg.sh is tested.
QtAV built from a newer linux system like ubuntu 14.04 may not work on old system like ubuntu 12.04 because of some symbols is missing. For example, clock_get_time is in glibc>=2.17 and librt. An convenience option is added since 1.4.2. Just add CONFIG += glibc_compat in QTAV_BUILD_DIR/.qmake.cache
more flexible configuration, such as build path, blablabla.