Merge commit '79041d92ee7421853ee8c57fc13891cb0c272e0e' into release/2.2
* commit '79041d92ee7421853ee8c57fc13891cb0c272e0e': matroska: add the Opus mapping Conflicts: libavformat/matroska.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
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