[FFmpeg-trac] #4160(undetermined:new): problem encoding opus file with unusual channel mask

[FFmpeg]

#4160: problem encoding opus file with unusual channel mask
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             Reporter:  divide  |                    Owner:
                 Type:  defect  |                   Status:  new
             Priority:  normal  |                Component:  undetermined
              Version:  2.5     |               Resolution:
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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Comment (by derf):

 One could encode this as channel mapping family 1 with 5 channels, and use
 the channel mapping table to map the C and BR channels to silence (so they
 would not need to be encoded or decoded).

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Ticket URL: <https://trac.ffmpeg.org/ticket/4160#comment:5>
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