[FFmpeg-trac] #8578(avformat:new): FFmpeg 4.2 breaks Matroska streaming

[FFmpeg]

#8578: FFmpeg 4.2 breaks Matroska streaming
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             Reporter:  Sesse        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mkv          |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by mkver):

 Now that you have mentioned the markers: They are broken: The check for
 the beginning of a new cluster should be "if (mkv->cluster_pos == -1)" and
 not "if (!mkv->cluster_pos)". Will send a patch.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8578#comment:5>
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