[FFmpeg-trac] #9560(undetermined:new): SSIM result will be lower than expected when use .mkv

[FFmpeg]

#9560: SSIM result will be lower than expected when use .mkv
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             Reporter:  rxf91        |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  ssim         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by rxf91):

 Thank you. I understand "-c: v copy" to mkv.
 But what about encoding in x264?
 Both mp4 and mkv have fixed frame rate of 23.976 (24000/1001) fps(by
 mediainfo), and the SSIM calculated by x264 is the same, but the SSIM
 calculated by ffmpeg (after encoding) is different.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9560#comment:4>
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