[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 pdr0):

 The timebase of mkv container is 1ms, so the timestamps will be different
 and you will get "jitter" , thus different results

 The examples in the documentation say differently - but it should be
 settb=1/AVTB ; not settb=AVTB for PSNR, SSIM calculations . Works here for
 normalizing the timebase
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Ticket URL: <https://trac.ffmpeg.org/ticket/9560#comment:5>
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