[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 pkv):

 The default channel layouts supported by aac encoder are:
 mono, stereo, 3.0, 4.0, 5.0 and 5.1
 (FC, FL+FR, FL+FR+FC, FL+FR+FC+BC, FL+FR+FC+BL+BR, FL+FR+FC+BL+BR+LFE).
 If one of your layouts is one of those, they will be encoded as before.
 If your layout is not one of them but is close, for instance 5.1(side),
 you can do as atomnuker said:
 ffmpeg -channel_layout 5.1 -i input etc...

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Ticket URL: <https://trac.ffmpeg.org/ticket/7384#comment:10>
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