[FFmpeg-trac] #4954(avformat:open): joint stereo indicator missing from mp3 headers

[FFmpeg]

#4954: joint stereo indicator missing from mp3 headers
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             Reporter:  pico4743    |                    Owner:  (none)
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mp3         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by GraniteStateColin):

 Replying to [comment:14 Balling]:
 > >the use of SoX, which has not similarly improved,
 >
 > This makes no sense. Both we and Sox use the only encoder, lame. Other
 encoders exist, I know of two and also something from apple, but they are
 not reference level.
 >
 > Apple:
 https://hydrogenaud.io/index.php/topic,104575.msg857777.html#msg857777

 Perhaps that is a good clue as to where ffmpeg goes wrong. Please perform
 the test examples provided to see the problem. It can be reproduced with
 100% consistency within about 1 minute by anyone.
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Ticket URL: <https://trac.ffmpeg.org/ticket/4954#comment:15>
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