[FFmpeg-trac] #9560(undetermined:new): SSIM result will be lower than expected when use .mkv
FFmpeg
trac at avcodec.org
Tue Dec 21 08:55:22 EET 2021
#9560: SSIM result will be lower than expected when use .mkv
-------------------------------------+-------------------------------------
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):
Replying to [comment:5 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
>
>
Great thanks!
"settb=1/AVTB" option works fine for SSIM curation.
{{{
D:\bin\ffmpeg>ffmpeg -i x264.mkv -i origin.m2ts -an -lavfi
"[0:v]settb=1/AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=1/AVTB,setpts=PTS-
STARTPTS[ref];[main][ref]ssim" -f null -
[Parsed_ssim_4 @ 00000203074e1140] SSIM Y:0.983138 (17.731021) U:0.992124
(21.037030) V:0.993634 (21.961672) All:0.986385 (18.659951)
}}}
I hope that this information will be added to the examples in the
documentation.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9560#comment:7>
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