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4349 Serge 1 
FFmpeg currently uses a custom build system, this text attempts to document
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some of its obscure features and options.
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Makefile variables:
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V
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    Disable the default terse mode, the full command issued by make and its
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    output will be shown on the screen.
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DESTDIR
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    Destination directory for the install targets, useful to prepare packages
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    or install FFmpeg in cross-environments.
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Makefile targets:
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all
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    Default target, builds all the libraries and the executables.
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fate
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    Run the fate test suite, note you must have installed it
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fate-list
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    Will list all fate/regression test targets
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install
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    Install headers, libraries and programs.
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libavformat/output-example
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    Build the libavformat basic example.
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libavcodec/api-example
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    Build the libavcodec basic example.
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libswscale/swscale-test
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    Build the swscale self-test (useful also as example).
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Useful standard make commands:
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make -t
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    Touch all files that otherwise would be build, this is useful to reduce
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    unneeded rebuilding when changing headers, but note you must force rebuilds
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    of files that actually need it by hand then.
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make -j
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    rebuild with multiple jobs at the same time. Faster on multi processor systems
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make -k
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    continue build in case of errors, this is useful for the regression tests
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    sometimes but note it will still not run all reg tests.
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