[FFmpeg-trac] #5641(avformat:open): Support WebVTT according to MKV specs

[FFmpeg]

#5641: Support WebVTT according to MKV specs
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             Reporter:  RiCON       |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  webvtt mkv  |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Comment (by ale5000):

 There are 2 commits to support WebVTT parsing, could they be be ported
 back to main ffmpeg?

 They are here:
 https://git.1f0.de/gitweb/?p=ffmpeg.git;a=commit;h=66185f50f8297454c599186067ae2c2b229870a9;js=1
 https://git.1f0.de/gitweb/?p=ffmpeg.git;a=commit;h=803713d8ba6da8d4d0c4de23cbe1ab33e3864f60;js=1

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Ticket URL: <https://trac.ffmpeg.org/ticket/5641#comment:5>
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