[FFmpeg-trac] #3182(avformat:new): A/V desync when transcoding MPEG-TS streams if an audio track disappears

[FFmpeg]

#3182: A/V desync when transcoding MPEG-TS streams if an audio track disappears
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             Reporter:  aurelien    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mpegts      |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by aurelien):

 I managed to get a real sample this night on a Chinese channel.
 I uploaded it on the FTP (ntd_gap_sound.ts).

 There is the end of a Nissan commercial, the start of an unknown one then
 a test card, then a black screen and no sound for ~47s.
 After some time a news broadcast starts.

 Here are the timestamps :
 00:12s : test card + black screen and no sound
 00:59s : news broadcast starts

 When encoded with ffmpeg I get :
 00:12s : test card + black screen and no sound
 00:32s : news broadcast _sound_ starts
 00:59s : news broadcast _video_ starts

 Is this sample OK for you ?

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Ticket URL: <https://trac.ffmpeg.org/ticket/3182#comment:2>
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