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

[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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Comment (by Andres Rohr):

 Thanks for the quick response.

 I see. Tested that specifying the output option "-ac 5" drops the Back
 Centre and solves the problem. But the average user can't understand why
 the processing fails. He doesn't know which channels are inside. If there
 would be a clearer info that only one channel is making all the trouble
 and that reducing the channels with "-ac 5" would solve the problem, would
 be a nice addition.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10207#comment:4>
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