[FFmpeg-trac] #5369(undetermined:open): new audiotoolbox encoder does not support AAC encoding with more than 2 channels

[FFmpeg]

#5369: new audiotoolbox encoder does not support AAC encoding with more than 2
channels
-------------------------------------+-------------------------------------
             Reporter:  julian       |                    Owner:  11rcombs
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
  audiotoolbox osx                   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [comment:4 julian]:
 > but if additionally include an AC3 surround copy of the very same
 audiotrack it fails with the audiotoolbox code complaining:
 >
 > ffmpeg -i test.mkv  -map 0:0 -map 0:1 -map 0:1 -vcodec copy -c:a:0 aac
 -ac:0 2 -b:a:0 128k  -c:a:1 ac3 -ac:1 6 -b:a:1 448k test.mp4

 The syntax of {{{-ac}}} is unexpected, see ticket #4823.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5369#comment:5>
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