[FFmpeg-trac] #1924(avformat:closed): ASS subtitles are demuxed inconsistently

[FFmpeg]

#1924: ASS subtitles are demuxed inconsistently
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             Reporter:  gjdfgh       |                    Owner:
                 Type:  enhancement  |                   Status:  closed
             Priority:  normal       |                Component:  avformat
              Version:  unspecified  |               Resolution:  invalid
             Keywords:  ass          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by reimar):

 I would consider this a feature request to allow handling seeking in
 different, possibly better ways.
 I don't really agree that not flushing is better: It results in random
 behaviour after seeking, entirely dependent on what parts of the video you
 watched before.
 The fully working way to support this would be to index the file and mark
 "key frames", i.e. positions where you can start playback exactly because
 none of the subtitles before that point influence the rendering of those
 after.
 This is the same way we handle audio and video.
 On second thought, I think I kind of agree it is a bug that we do not do
 it like this.
 The ReadOrder method on the other hand to me seems like a really messy
 hack that doesn't work properly half of the time and due to its random
 behaviour gives a rather bad experience.
 I admit it would be easier to add than 100% perfect seeking support
 though.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1924#comment:12>
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