[FFmpeg-trac] #296(undetermined:open): avi file can't be seeked

[FFmpeg]

#296: avi file can't be seeked
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             Reporter:  ami_stuff    |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  msvideo1     |               Resolution:
  seek                               |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by DonMoir):

 These type of files fail into a category where the main background does
 not change often and it is appropriate for them to have one or just a few
 keyframes.

 first_keyframe_only_confused.mov and first_keyframe_only_count.mkv are the
 same as evbpic.avi in the sense they all only have 1 first keyframe. They
 also can be seeked into easily and quickly if little more work is
 performed when seeking.

 no_keyframes_filecopy.avi has no keyframes and so the first frame must be
 artificially marked as a keyframe for it to work and then proceed with
 exact timestamp seeking on it.

 The same problem is going to exist on files where the keyframes are
 sparse, but more than one, in that you will notice large jumps when trying
 to seek with ffmpeg.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/296#comment:7>
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