[FFmpeg-trac] #5309(undetermined:new): Seek doesn't work in some .mp4 files

[FFmpeg]

#5309: Seek doesn't work in some .mp4 files
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             Reporter:  Arnaud       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  h264 mov     |               Resolution:
  seek                               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 No IDR- (and no I-) frames are necessary to seek a valid H.264 stream,
 recovery points are sufficient. A stream analyzer is needed to find out if
 your stream does contain more than one recovery point.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5309#comment:14>
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