[FFmpeg-trac] #8126(undetermined:new): When I play a mkv(video:avc/audio:flac) not from the begining, it blurred.

[FFmpeg]

#8126: When I play a mkv(video:avc/audio:flac) not from the begining,it blurred.
-------------------------------------+-------------------------------------
             Reporter:  WillFarmer   |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  4.2
  undetermined                       |
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 How to reproduce:
 {{{
 % ffplay -ss 00:00:10 Joout.mkv
 ffmpeg version new
 built on Linux
 }}}
 When I play the Joout.mkv not from the begining, it blurred.But I play
 from the begining, it plays OK.
 Below is logs:
 {{{
     top block unavailable for requested intra mode -1
     error while decoding MB 9 0, bytestream 146931
     concealing 8160 DC, 8160 AC, 8160 MV errors in I frame
     ..........
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8126>
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