[FFmpeg-trac] #9377(undetermined:new): QSV MPEG2 => H264 transcode PSNR dropped by 32%

[FFmpeg]

#9377: QSV MPEG2 => H264 transcode PSNR dropped by 32%
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             Reporter:  eero-t       |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by wenbin,chen):

 On my side:
 2021-06-19 2cf95f2dd9: lavfi/dnn_backend_openvino.c: fix crash when target
 is not specified
 PSNR y:27.821483 u:44.197586 v:43.288310 average:29.526907 min:12.768913
 max:77.215654

 2021-06-20 efc22e63e5: lavfi/vf_vpp_qsv: fix the time_base for outlink
 PSNR y:27.821483 u:44.197586 v:43.288310 average:29.526907 min:12.768913
 max:77.215654

 2021-10-23 069f7831a2: avfilter/vf_owdenoise: relicense my code
 PSNR y:47.045426 u:52.790706 v:52.699500 average:48.257933 min:35.995547
 max:77.215654

 On the latest commit, the PSNR increases. Seems someone fix the issue.
 I cannot reproduce the PSNR drop between the two commits provided by you.
 Is it a stream specified problem?
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Ticket URL: <https://trac.ffmpeg.org/ticket/9377#comment:3>
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