[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 divide):

 This file was created on purpose with an unusual channel mask to see how
 opus encoder would react.
 Using FFMpeg, while most non-destructive formats such as .caf, .aiff,
 .wav, .flac store the data and channel mask properly, .aac and .ogg store
 the 3 channels "as is", assuming FL+FR+FC (which is okay since I guess
 thoses formats don't have a way to store channel mask).
 FFmpeg should do the same for .opus, instead of just failing with an
 error.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4160#comment:8>
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