[FFmpeg-trac] #3705(avcodec:open): Seeking fails for H264 file

[FFmpeg]

#3705: Seeking fails for H264 file
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             Reporter:  Aleksoid1978  |                    Owner:  (none)
                 Type:  defect        |                   Status:  open
             Priority:  normal        |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:  h264          |               Blocked By:
             Blocking:                |  Reproduced by developer:  1
Analyzed by developer:  0             |
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Comment (by Balling):

 Invalid file and invalid fix. You cannot mark each I frame as key frame
 because sometimes frames after I frame will need frames before, which
 means you cannot cleanly recover.

 Powerdvd just decodes all frames starting the first frame. So it is just a
 dup with #5309
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Ticket URL: <https://trac.ffmpeg.org/ticket/3705#comment:17>
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