[FFmpeg-trac] #10207(undetermined:open): aac 6 channels -> ac3 6 channels fails (Back Centre, Cb not supported)) (was: aac 6 channels -> ac3 6 channels fails)

[FFmpeg]

#10207: aac 6 channels -> ac3 6 channels fails (Back Centre, Cb not supported))
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             Reporter:  Andres Rohr  |                    Owner:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  aac, ac3     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by Balling):

 * keywords:  6 channels, aac, ac3 => aac, ac3
 * status:  new => open
 * summary:  aac 6 channels -> ac3 6 channels fails =>
     aac 6 channels -> ac3 6 channels fails (Back Centre, Cb not
     supported))

Comment:

 "aac 6 channels" Your little file has Cb channel in place of LFE. That
 channel is Back Centre. We do support this, but AC3 does not, so it needs
 convertion and '''we do not support that'''.

 See this for clarity, last MediaInfo Name says that Cb means back center
 that is right behind your head perfectly.
 https://mediaarea.net/AudioChannelLayout

 Older version just creates L R C Ls Rs file, i.e. 5.0 file.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10207#comment:1>
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