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Adds dependency to libavfilter, which provides many useful utilities such as hardware encoding, mixing audio or rotating video. Access to libavfilter is done through the MediaFilter class, which takes a filter graph string and AVFrames as input and outputs filtered AVFrames. Adds unit tests for MediaFilter. Change-Id: I0bf3869a9f19ad9cbbe1fc5e2d37eb83ece66ccc Reviewed-by: Sebastien Blin <sebastien.blin@savoirfairelinux.com>
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