[FFmpeg-trac] #7384(avcodec:closed): 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:  closed
             Priority:  important   |                Component:  avcodec
              Version:  git-master  |               Resolution:  invalid
             Keywords:  aac         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Changes (by atomnuker):

 * status:  open => closed
 * resolution:   => invalid


Comment:

 The issue is that the file signals a layout of 5.1(side), but the AAC spec
 only supports 5.1(rear channels instead of side). Hence, to express that
 the encoder uses a not-so-universally supported feature to signal the non-
 standard layout. Firefox 62.0 here supports decoding it just fine, so
 maybe whatever you're using is old.
 You can convert between 5.1(side) and 5.1(rear) by specifying
 -channel_layout "5.1".

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Ticket URL: <https://trac.ffmpeg.org/ticket/7384#comment:3>
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