[Bug 723327] matroskademux: Set buffer offsets for output

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723327
  GStreamer | gst-plugins-good | git

--- Comment #9 from Brendan Long <self at brendanlong.com> 2014-02-04 23:55:58 UTC ---
(In reply to comment #8)
> (In reply to comment #6)
> > What cue identifier?
> 
> http://dev.w3.org/html5/webvtt/#dfn-webvtt-cue-identifier

Cues aren't required to have an ID though (like they are in SRT). Most WebVTT
files I've seen don't include IDs at all.

This isn't something we're trying to expose to JavaScript, we just need *any*
way to determine if two cues are the same cue (not just identical content). I
haven't been able to think of anything except the byte offset in the file
though. Keeping track of the number of cues we've seen, like the frame number
for video would be nice, but I'm not sure if there's any way to do that if we
jump to the middle of a file.

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