[FFmpeg-trac] #2263(undetermined:new): MKV: keyframe not used when using -ss on input?

[FFmpeg]

#2263: MKV: keyframe not used when using -ss on input?
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             Reporter:  eelco        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mkv h264     |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by eelco):

 Yes. I originally noticed the problem because I was trying to make a frame
 image at about 30 minutes, which took several minutes.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2263#comment:3>
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