[FFmpeg-trac] #11093(undetermined:new): ffmpeg overwrting channel layout, resluting in no sound in vlc

[FFmpeg]

#11093: ffmpeg overwrting channel layout, resluting in no sound in vlc
-------------------------------------+-------------------------------------
             Reporter:  solomoncyj   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  libopus      |               Blocked By:
  channel_layout                     |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 when i was encoding a dts 5.1 ch audio that had the layout of `C L R Ls Rs
 LFE` , file using `ffmpeg `via `libopus` ,  i found that the resulting
 file did not play in vlc, due to the channel layout being rewritten to `L
 R C Lb Rb LFE`, whereas the original file could. however if downmixed to
 stereo, there would be sound. the attached link contains a copy of the
 song file which i reported to have no audio when encoded into opus format
 in 5.1 ch mode . FFmpeg should retain the channel layout, or copy the data
 in the channel to the correct one in the output file

 How to reproduce:
 {{{
 % ffmpeg -i out.dts -c:a libopus -b:a 160k -af
 "channelmap=channel_layout=5.1" out.opus
 ffmpeg version 6.1.1
 built on dnf rpm fusion
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11093>
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