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

[FFmpeg]

#4160: problem encoding opus file with unusual channel mask
-------------------------------------+-------------------------------------
             Reporter:  divide       |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  2.5
  undetermined                       |               Blocked By:
             Keywords:  opus encode  |  Reproduced by developer:  0
  multichannel channel mask          |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: trying to encode opus audio file with unusual channel
 mask (for example FL+FR+BL) generates an error.
 How to reproduce: ffmpeg -i 3flfrbl.wav 3flfrbl.opus
 {{{
 % ffmpeg -i 3flfrbl.wav 3flfrbl.opus
 ffmpeg version 2.5
 built on December 3rd 2014
 }}}

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