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The rest of rules.mak assumes that either of them is set (and check either "ifdef USE_FFMPEG" or "ifdef USE_LIBAV"), but by default neither is set. If using the "ifndef USE_LIBAV" branch and fetching sources from ffmpeg, make sure USE_FFMPEG is set in the rest of the makefile. Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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