[FFmpeg-trac] #9781(avfilter:reopened): zscale adds distortion when resampling video data

[FFmpeg]

#9781: zscale adds distortion when resampling video data
-------------------------------------+-------------------------------------
             Reporter:  Llyw         |                    Owner:  (none)
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  zscale       |               Blocked By:
  distortion                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Llyw):

 * status:  closed => reopened
 * resolution:  invalid =>

Comment:

 I do not understand how that is invalid. The PNGs are screenshots of VLC,
 where I used the advance-by-1-frame option to forward to the same frame in
 all three files before taking the screenshot.

 If you don't feel like taking the screenshots seriously, at least try my
 reproducer command using the `zscale` filter and compare the git-master
 and 5.0.1 output. The difference will be immediately apparent. You are
 also free to try any other input, but it did take me several hours to come
 up with an easy enough reproducer so I must ask you to put at least some
 effort into this.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9781#comment:3>
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