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

[FFmpeg]

#5718: ffmpeg not remapping channels for libopus automatically
-------------------------------------+-------------------------------------
             Reporter:  agressiv     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  libopus      |               Blocked By:
  channelmap                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 {{{
 [libopus @ 00000000026ad020] Invalid channel layout 5.1(side) for
 specified mapping family -1.
 }}}

 Summary of the bug:
 Encode a 5.1 audio file with 5.1(side) channel map
 How to reproduce:
 {{{
 % ffmpeg -i movie-with-51side.mkv -c:a libopus -b:a 256k output.mkv
 ffmpeg version N-81025-g25ca74d
 built on July 15 2016
 }}}

 ffmpeg version N-80101-gd970f7b automatically remapped these to the rear
 channels since libopus doesn't seem to allow side channels.  I now have to
 explicitly add:

 {{{
 -af "channelmap=channel_layout=5.1"
 }}}

 Not sure if this is expected behavior or not.  Without this channelmap, it
 aborts.  Command-line opusenc automatically remaps as well.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5718>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker