[FFmpeg-trac] #9460(avfilter:new): ssim only 0.47 while PSNR is 37, and skimage's result is 0.914 (was: ssim issue)
FFmpeg
trac at avcodec.org
Mon Oct 18 16:11:15 EEST 2021
#9460: ssim only 0.47 while PSNR is 37, and skimage's result is 0.914
------------------------------------+------------------------------------
Reporter: xmufzy | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: avfilter
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by xmufzy):
* summary: ssim issue => ssim only 0.47 while PSNR is 37, and skimage's
result is 0.914
Old description:
> Summary of the bug:
> How to reproduce:
> {{{
> % ffmpeg.exe -i ./src0.png -i src1.png -lavfi ssim -f null -
> ffmpeg version
> ffmpeg version N-104375-g77970abb71-20211017 Copyright (c) 2000-2021 the
> FFmpeg developers
> N-104375-g77970abb71 (centos & ubuntu)
> built on ...
>
> Stream #1:0: Video: png, rgb24(pc), 460x460, 25 fps, 25 tbr, 25 tbn
> Stream mapping:
> Stream #0:0 (png) -> ssim:main
> Stream #1:0 (png) -> ssim:reference
> ssim -> Stream #0:0 (wrapped_avframe)
> Press [q] to stop, [?] for help
> Output #0, null, to 'pipe:':
> Metadata:
> encoder : Lavf59.6.100
> Stream #0:0: Video: wrapped_avframe, gbrp(pc, gbr/unknown/unknown,
> progressive), 460x460, q=2-31, 200 kb/s, 25 fps, 25 tbn (default)
> Metadata:
> encoder : Lavc59.12.100 wrapped_avframe
> frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
> speed=1.45x
> video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: unknown
> }}}
> Patches should be submitted to the ffmpeg-devel mailing list and not this
> bug tracker.
New description:
Summary of the bug:
How to reproduce:
{{{
[Parsed_psnr_0 @ 0x13ac300] PSNR r:38.074962 g:39.999312 b:35.868513
average:37.655646 min:37.655646 max:37.655646
% ffmpeg.exe -i ./src0.png -i src1.png -lavfi ssim -f null -
ffmpeg version
ffmpeg version N-104375-g77970abb71-20211017 Copyright (c) 2000-2021 the
FFmpeg developers
N-104375-g77970abb71 (centos & ubuntu)
built on ...
Stream #1:0: Video: png, rgb24(pc), 460x460, 25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 (png) -> ssim:main
Stream #1:0 (png) -> ssim:reference
ssim -> Stream #0:0 (wrapped_avframe)
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf59.6.100
Stream #0:0: Video: wrapped_avframe, gbrp(pc, gbr/unknown/unknown,
progressive), 460x460, q=2-31, 200 kb/s, 25 fps, 25 tbn (default)
Metadata:
encoder : Lavc59.12.100 wrapped_avframe
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
speed=1.45x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
}}}
Patches should be submitted to the ffmpeg-devel mailing list and not this
bug tracker.
--
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Ticket URL: <https://trac.ffmpeg.org/ticket/9460#comment:1>
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