[FFmpeg-trac] #9703(undetermined:new): Multichannel wav muxed in mkv
FFmpeg
trac at avcodec.org
Tue Mar 29 15:49:30 EEST 2022
#9703: Multichannel wav muxed in mkv
-------------------------------------+-------------------------------------
Reporter: Jose | Owner: (none)
Peirote |
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Jose Peirote:
Old description:
> How to reproduce:
> ffmpeg -i input.mkv -i L_R_C_Cb.wav -acodec copy output.mkv
>
> The PCM track is created with CodecID A_PCM/INT/LIT and lost the channel
> map.
> That track is wrong extracted/played like with the default for 4
> channels: L R Ls Rs
>
> The track must be muxed with CodecID A_MS/ACM to preserve the channel map
> in the Codec Private data (a copy of the fmt chunk from
> WAVE_EXTENSIBLE_FORMAT header)
>
> That method is used OK with wformat (from wav header) not 1,3,0xfffe. I
> suggest must be used also for 0xfffe (WAVE_EXTENSIBLE_FORMAT header)
>
> More info here:
> https://forum.doom9.org/showthread.php?p=1966534#post1966534
New description:
How to reproduce:
ffmpeg -i input.mkv -i L_R_C_Cb.wav -codec copy output.mkv
The PCM track is created with CodecID A_PCM/INT/LIT and lost the channel
map.
That track is wrong extracted/played like with the default for 4 channels:
L R Ls Rs
The track must be muxed with CodecID A_MS/ACM to preserve the channel map
in the Codec Private data (a copy of the fmt chunk from
WAVE_EXTENSIBLE_FORMAT header)
That method is used OK with wformat (from wav header) not 1,3,0xfffe. I
suggest must be used also for 0xfffe (WAVE_EXTENSIBLE_FORMAT header)
More info here:
https://forum.doom9.org/showthread.php?p=1966534#post1966534
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Ticket URL: <https://trac.ffmpeg.org/ticket/9703#comment:1>
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