[FFmpeg-trac] #598(avformat:open): Subtitle on some BD/m2ts files are not handle.

[FFmpeg]

#598: Subtitle on some BD/m2ts files are not handle.
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             Reporter:  Sebastiii    |                    Owner:  michael
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  subtitle     |               Blocked By:
  m2ts pmt bluray                    |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by Andrea3000):

 Replying to [comment:14 cehoyos]:
 > The change in pat_cb() alone seems sufficient.
 >
 > Do you know why ffplay shows the subtitles in 00002_nosubs_detected.m2ts
 only for one frame?

 I know it.

 It's a behavior that I've encountered only with Avatar's subtitles.
 After quite every correct subtitles there is a blank subtitle with a start
 time that is few milliseconds later than (or even equal to) the start time
 of the previous correct subtitles. Since blank subtitles are used to mark
 clearing of old subtitle before displaying the new one, the correct
 subtitles is cleared immediadetly after having been shown.
 I can also affirm that this issue is related to the timing because after
 the blank subtitle with wrong start time is decoded, the next frame is a
 new correct subtitle to be displayed and not the blank subtitles which
 should clear the old one at the right time. It seems that the blank
 subtitle has a start time which is equal to the start time of the previous
 correct subtitle rather than having the start time equal to the end time
 of the sub (the correct end time obviously, not the 20s timeout which the
 actual decoder set).

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/598#comment:18>
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