[FFmpeg-trac] #5718(avcodec:open): ffmpeg not remapping channels for libopus automatically

[FFmpeg]

#5718: ffmpeg not remapping channels for libopus automatically
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             Reporter:  agressiv     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  libopus      |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by mgraczyk):

 agressiv, thanks for that. I see that opusenc has a few special cases for
 moving rear to side and side to rear. I would have liked to preserve the
 behavior in this case as it was before 37941878f by default. I am hopeful
 we can restore this behavior without removing the mapping_family argument.

 All,
 Would it make sense to add these special cases explicitly to libopusenc.c,
 and log a warning as is done by opusenc?

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Ticket URL: <https://trac.ffmpeg.org/ticket/5718#comment:7>
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