[FFmpeg-trac] #9481(undetermined:new): VA-API + QSV H264 => MPEG2 transcode PSNR dropped by 25%

[FFmpeg]

#9481: VA-API + QSV H264 => MPEG2 transcode PSNR dropped by 25%
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             Reporter:  eero-t       |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by wenbin,chen):

 I found the problem is not about VA-API. Between two commits, the encoded
 stream is identical. It is PSNR calculation command that returns different
 results. If I run PSNR calculation command on the same output video on two
 commits, I get different result.
 The decoded yuv data of build-in 264 decoder on two commit have same md5
 value, so seems it is an issue of PSNR filter.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9481#comment:2>
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