[FFmpeg-trac] #8515(avcodec:open): vc1_parser erroneously flagged every packet as keyframe

[FFmpeg]

#8515: vc1_parser erroneously flagged every packet as keyframe
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             Reporter:  HolyWu       |                    Owner:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  vc1          |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 Replying to [comment:4 mkver]:
 > It happens whenever the PARSER_FLAG_COMPLETE_FRAMES is set (it is for
 Matroska), because unesc_index is never reset in this case after having
 parsed the first frame.

 Can you fix it? Or just revert 701e8b42e12ad625c64ceae2252acb1de390278c.
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Ticket URL: <https://trac.ffmpeg.org/ticket/8515#comment:5>
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