[FFmpeg-trac] #911(undetermined:closed): ffplay can't handle timecodes of WMV2 video correctly

[FFmpeg]

#911: ffplay can't handle timecodes of WMV2 video correctly
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             Reporter:               |                    Owner:
  zhushisongzhu                      |                   Status:  closed
                 Type:  defect       |                Component:
             Priority:  important    |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  asf wmv2     |  worksforme
  seeking                            |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [comment:5 zhushisongzhu]:
 > I see that we can just seek from one keyframe to another keyframe and we
 can't seek between two keyframes.

 > But why can windows media player can control time progress bar smoothly
 and correctly?

 I do not understand the question.

 > I play the video using your suggested command: mplayer hzvideo.wmv
 -lavdopts skipframe=nonkey
 > The video output is frozen.

 I only suggested this command line (that forces MPlayer to skip all non-
 key frames) to allow you to reproduce the fact that the sample only
 contains two keyframes: The output is not frozen, the first keyframe is
 shown for ten seconds, the second keyframe is shown for the remaining
 playback time.

 I was able to test your sample with WMP on older hardware (2GHz Athlon):
 If I seek to "09:17:26" on the counter in the right upper corner, seeking
 (back and forth) is very fast, if I try to seek to "09:17:24" seeking
 takes much longer, indicating I was right when I wrote above that WMP also
 has to seek back to the beginning, it has to decode all frames between the
 last keyframe and the specified seeking position to create the allusion of
 random seeking.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/911#comment:6>
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