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

FFmpeg trac at avcodec.org
Thu Oct 28 15:02:15 EEST 2021

#9377: QSV MPEG2 => H264 transcode PSNR dropped by 32%
             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            |
Comment (by eero-t):

 Note: the "A decode call did not consume any data: expect more data at
 input" messages in FFmpeg output are there also before PSNR regression,
 they are not new.

 FYI: When asking FFmpeg to calculate SSIM between the original and
 transcoded file instead of PSNR, the  regression is ~5%.  Performance is
 not impacted.
Ticket URL: <https://trac.ffmpeg.org/ticket/9377#comment:5>
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