[FFmpeg-trac] #7502(undetermined:new): VAAPI encoding on Coffee Lake skipping/missing frames

FFmpeg trac at avcodec.org
Sun Oct 28 19:20:49 EET 2018

#7502: VAAPI encoding on Coffee Lake skipping/missing frames
             Reporter:  dseeker      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  vaapi        |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by jkqxz):

 Can you try with <https://lists.ffmpeg.org/pipermail/ffmpeg-
 devel/2018-October/235692.html> applied?

 The only problem I can see here is that the SAR gets written incorrectly
 because it doesn't fit in the 2^16^ range.  I'm not sure how that causes
 the observed issue, but fixing it seems to help.

 That is, if I fix the SAR in your file with:
 ffmpeg -i vaapi_skipping-frames_h264.mp4 -c:v copy -bsf:v
 h264_metadata=sample_aspect_ratio=1 output.mp4
 then the output file plays correctly where the input did not.

Ticket URL: <https://trac.ffmpeg.org/ticket/7502#comment:3>
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