[FFmpeg-trac] #7384(avcodec:reopened): FFmpeg 4.0 does not set 5.1 surround sound into audio stream when converting mkv video with 5.1 surround sound

[FFmpeg]

#7384: FFmpeg 4.0 does not set 5.1 surround sound into audio stream when
converting mkv video with 5.1 surround sound
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             Reporter:  itrdev      |                    Owner:
                 Type:  defect      |                   Status:  reopened
             Priority:  important   |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  aac         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by itrdev):

 My general question is how I should convert videos with different channels
 layouts to save theirs layouts with ffmpeg 4.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7384#comment:9>
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