[FFmpeg-trac] #6913(undetermined:new): 24h test pattern encode results in corrupted output and fails to play correctly in ffplay

[FFmpeg]

#6913: 24h test pattern encode results in corrupted output and fails to play
correctly in ffplay
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             Reporter:  fiuqwb       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by fiuqwb):

 With no audio, with 256x144 resolution and lixb264: issue remains, though
 slightly different in appearance. Now there are pauses in playback
 (picture freezes for a second, FFplay console output keeps counting
 timestamp but no other numbers change) instead of visual garbage. No
 errors are printed to FFplay stderr.

 Hypothesis: some threshold value is no longer exceeded due to smaller data
 size from smaller resolution, so the visible behavior changes but the
 internal issue creating the bad data remains.

 With no audio, with 256x144 resolution and huffyuv: issue does not
 reproduce.

 With no audio, with 256x144 resolution and -vcodec mpeg4 -qscale 2: issue
 does not reproduce.

 I will also try larger resolution with mpeg4, to verify that a smaller
 data size does not simply hide the problem, though it will take a while to
 do the encode due to the larger size - will report back tomorrow on
 results for that.

 It seems likely that the issue is related specifically to libx264. If the
 mpeg4 test with larger resolution also does not reproduce the issue, what
 would be the appropriate next steps here?

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Ticket URL: <https://trac.ffmpeg.org/ticket/6913#comment:4>
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