libavutil-dev 6:9.20-0ubuntu0.14.04.1 (armhf binary) in ubuntu trusty

 Libav is a complete, cross-platform solution to decode, encode, record,
 convert and stream audio and video.
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 This is the common utility library from Libav.
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 This package contains the header files and static libraries needed to
 compile applications or shared objects that use libavutil.