libav-dbg 6:9.20-0ubuntu0.14.04.1 (arm64 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 package contains debug data of the Libav related shared libraries.
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 Most people will not need this package. Please install it to produce useful
 stacktraces to help debugging the Libav library.