[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   |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  libopus      |               Blocked By:
  channel_layout                     |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by solomoncyj:

Old description:

> 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.

New description:

 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`. however if downmixed to stereo, there would be sound.
 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.

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Ticket URL: <https://trac.ffmpeg.org/ticket/11093#comment:1>
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