[FFmpeg-trac] #7254(avcodec:new): ffmpeg h264_qsv encoder can not output QP to evaluate encoding quality

FFmpeg trac at avcodec.org
Mon Jun 11 08:42:42 EEST 2018


#7254: ffmpeg h264_qsv encoder can not output QP to evaluate encoding quality
-------------------------------------+-------------------------------------
             Reporter:  jianhui      |                     Type:
               Status:  new          |  enhancement
            Component:  avcodec      |                 Priority:  normal
             Keywords:  qsv encoder  |                  Version:  git-
  PSNR QP                            |  master
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:
   I use ffmpeg h264_qsv to do transcoding, and want to get the PSNR or QP
 after transcoding to evaluate encoding quality. Once the PSNR or QP is too
 low, I will change coding parameter to re-transcoding to meet the minimum
 quality requirement.
   But both PSNR and QP are not supported by latest h264_qsv.

 How to reproduce:
   ffmpeg -i input -codec h264_qsv -psnr out.mp4

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Ticket URL: <https://trac.ffmpeg.org/ticket/7254>
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