[FFmpeg-trac] #4145(undetermined:new): when rebroadcasting/streaming to flv format with aac_adtstoasc bitstream filter, sound gets removed

[FFmpeg]

#4145: when rebroadcasting/streaming to flv format with aac_adtstoasc bitstream
filter, sound gets removed
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             Reporter:  PyroDevil    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  rtmp         |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by ipacker):

 I believe YouTube recently (June 2017) made changes to their ingestion
 system and this problem can now be seen against their rtmp receiver too.
 Previously YouTube were accepting these streams.

 It seems to be caused when taking a video/audio stream from HLS/MPEGTS and
 passing it to RTMP via codec copy and aac_adtstoasc. Re-encoding just the
 audio fixes the problem instantly.

 Tested using latest git head from 14th June 2017.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4145#comment:11>
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