[FFmpeg-trac] #1035(FFplay:new): ffplay: after changing audio stream, audio video become out of sync

[FFmpeg]

#1035: ffplay: after changing audio stream, audio video become out of sync
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             Reporter:  rlf         |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  minor       |                Component:  FFplay
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by rlf):

 I confirm that after setting AV_NOSYNC_THRESHOLD 60.0, the problem goes
 away.

 But I don't understand why 10 seconds is not big enough. In my case, the
 sample is a Karaoke MTV. All audio streams in it is strictly sync-ed to
 the video stream. A-V will be sync-ed no matter which which audio stream
 is selected by command line such as:

     $ ffplay -ast 1 sample.mpg
     $ ffpaly -ast 2 sample.mpg

 but A-V will not be sync-ed after pressing 'a' during the playback
 process.

 I put the sample [ftp://115.236.58.114/sample/ktv/qingwang.mpg here].

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1035#comment:5>
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