[FFmpeg-trac] #3440(avformat:open): vp8: a/v desync on seek with -auto-alt-ref 1

[FFmpeg]

#3440: vp8: a/v desync on seek with -auto-alt-ref 1
-------------------------------------+-------------------------------------
             Reporter:  blacktrash   |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  libvpx       |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 Replying to [comment:10 michael]:
 > i tried to encode 2 files one with -max_interleave_delta 0 and one
 without, but they dont differ.
 > How can i reproduce the difference with -max_interleave_delta 0 that
 fixes this ?
 {{{
 $ md5sum BigBuckBunny_640x360.m4v
 bc59ea5addcb3efb82a8865574e7763c  BigBuckBunny_640x360.m4v
 }}}
 {{{
 $ ffmpeg -i BigBuckBunny_640x360.m4v -auto-alt-ref 1 -strict -2 -pass 1
 test.webm
 $ ffmpeg -i BigBuckBunny_640x360.m4v -auto-alt-ref 1 -strict -2 -pass 2 -y
 test.webm
 }}}
 {{{
 $ ffmpeg -i BigBuckBunny_640x360.m4v -auto-alt-ref 1 -strict -2
 -max_interleave_delta 0 -pass 1 test2.webm
 $ ffmpeg -i BigBuckBunny_640x360.m4v -auto-alt-ref 1 -strict -2
 -max_interleave_delta 0 -pass 2 -y test2.webm
 }}}
 The second output file is smaller, seeking works better even with ffplay
 (seeking in the first output file with MPlayer and vlc leads to massive
 A/V desync).

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Ticket URL: <https://trac.ffmpeg.org/ticket/3440#comment:12>
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