[FFmpeg-trac] #8529(avfilter:new): the ssim_c1 has bug in vf_ssim.c

FFmpeg trac at avcodec.org
Fri Mar 27 11:25:24 EET 2020


#8529: the ssim_c1 has bug in vf_ssim.c
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             Reporter:  wangwei1237  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  ssim         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+------------------------------------

Comment (by Balling):

 So, ssim_c1 is defined as (k_1 * L)^2, where k_1 is 0.01 and L is
 PIXEL_MAX (it is a define that is 255 for 8 bit). It means that everything
 is already squared... so it can be 64 == 8 * 8, dunno. Anyway, you forgot
 + 0.5

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Ticket URL: <https://trac.ffmpeg.org/ticket/8529#comment:4>
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