[FFmpeg-trac] #2516(undetermined:new): pgssub produce warnings and are blinking

FFmpeg trac at avcodec.org
Thu Jul 17 20:24:52 CEST 2014

#2516: pgssub produce warnings and are blinking
             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  git-master   |  undetermined
             Keywords:  pgssub       |               Resolution:
  regression videolan                |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by JohnAStebbins):

 Has anyone confirmed that kagero_cut.ts has a *valid* PGS stream.  I just
 took a closer look and it is violating the PGS spec or at least abusing it
 horribly.  The spec states that the presentation time for a PGS sub is the
 PTS of the PES containing the presentation segment. The spec also states
 that only one presentation segment may be active at any point in time.
 This stream has multiple presentation segments that have the same PTS.

 The fix that was committed for this appears very wrong to me, though it
 might be working around problems created by this broken stream.

Ticket URL: <https://trac.ffmpeg.org/ticket/2516#comment:10>
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