[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:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  libopus      |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by Elliot Lee):

 So in order to check which channel layouts are allowed,
 libavcodec/libopusenc.c uses libavcodec/vorbis_data.c's array of
 ff_vorbis_ch_layouts. I think the root of the problem is that
 ff_vorbis_ch_layouts does not list AV_CHANNEL_LAYOUT_5POINT1 as a possible
 channel layout. Is there any reason why it's not there?
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Ticket URL: <https://trac.ffmpeg.org/ticket/5718#comment:27>
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