[FFmpeg-trac] #11232(avformat:new): M4A metadata did not correct indicate VBR

[FFmpeg]

#11232: M4A metadata did not correct indicate VBR
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             Reporter:  Xafg        |                    Owner:  (none)
                 Type:  defect      |                   Status:  new
             Priority:  minor       |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mov         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by Xafg):

 -c:a libfdk_aac -b:a 128k -vbr 3 with this setting generates variable
 bitrate to mp4 container, however if I remove -b:a 128k it goes back to
 constant mode. And I think it applies to every container
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Ticket URL: <https://trac.ffmpeg.org/ticket/11232#comment:3>
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