[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
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             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            |
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Comment (by blacktrash):

 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 ?

 I can still reproduce the difference with ffmpeg version N-64623-g15e933b
 and libvpx v1.3.0-3444-g84744a4:

 {{{
 ffmpeg -y -i BigBuckBunny_640x360.m4v -f webm -c:v libvpx -auto-alt-ref 1
 -b:v 300k -c:a libvorbis -b:a 64k -pass 1 async.webm
 ffmpeg -y -i BigBuckBunny_640x360.m4v -f webm -c:v libvpx -auto-alt-ref 1
 -b:v 300k -c:a libvorbis -b:a 64k -pass 2 async.webm
 ffmpeg -y -i BigBuckBunny_640x360.m4v -f webm -c:v libvpx -auto-alt-ref 1
 -max_interleave_delta 0 -b:v 300k -c:a libvorbis -b:a 64k -pass 1
 sync.webm
 ffmpeg -y -i BigBuckBunny_640x360.m4v -f webm -c:v libvpx -auto-alt-ref 1
 -max_interleave_delta 0 -b:v 300k -c:a libvorbis -b:a 64k -pass 2
 sync.webm
 }}}

 Without {{{-max-interleave-delta 0}}} a-v desync on seek.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3440#comment:11>
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