[FFmpeg-trac] #2062(avcodec:new): Playback of HD-PVR recordings corrupted when using VDPAU

[FFmpeg]

#2062: Playback of HD-PVR recordings corrupted when using VDPAU
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             Reporter:  jyavenard    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  unspecified  |               Resolution:
             Keywords:  vdpau h264   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Glidos):

 Yes nice. Indeed that avoids the large has_b_frames value occuring during
 playback of the HDPVR sample I've been using for testing. So you already
 had places where inconsistencies were detected, and now you are resetting
 last_pocs there. My only remaining concern is that the tests don't (seem)
 to target the specific case of a large backwards transition in poc, and I
 don't know how to reason that that happening would always trigger also the
 tests you have in place. So I wonder if it will fix some hdpvr samples and
 not others.

 Concerning the mistriggering you saw when trying my patch, as you say it
 was unintended, but it was benign. The unnecessary case is when a poc is
 first entered into an empty last_pocs list (all INT_MIN, that is). It's
 benign because in that case, both branches of the 'if' lead to the same
 final program state. I've updated my patch to avoid triggering in that
 case:
 https://github.com/Glidos/mythtv/commit/f9579b5982cfc7a18c189ed62ddf23eb73d95825,
 although I don't expect us to need it now we have yours.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2062#comment:10>
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