[FFmpeg-trac] #9559(avfilter:new): vf_scale: param0 and param1 flooring decimals

[FFmpeg]

#9559: vf_scale: param0 and param1 flooring decimals
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             Reporter:  Mugnum    |                     Type:  defect
               Status:  new       |                 Priority:  minor
            Component:  avfilter  |                  Version:  git-master
             Keywords:  scale     |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:

 When using '''scale''' filter with bicubic algorithm, the '''param0''' and
 '''param1''' values are floored.
 For example, when inputting -param0 1.67, it behaves as if I entered
 -param0 1.00.

 Here's a demonstration of resulting files using utility Resample Scope:
 1) [https://imgur.com/a/IRVtRqI] vf_scale -- only integers work
 2) [https://imgur.com/a/1oyoptU] vf_scale_cuda -- decimals work, however
 filter has only 1 parameter

 How to reproduce:
 {{{
 ffmpeg -i pl.png
   -vf "scale=300:300:flags=bicubic:param0=0.33:param1=2/3" 0.png
   -vf "scale=300:300:flags=bicubic:param0=0.99:param1=5/6" 1.png
   -vf "scale=300:300:flags=bicubic:param0=1.00:param1=1"   2.png
 ffmpeg version n4.4.1-2-gcc33e73618-20211219 Copyright (c) 2000-2021 the
 FFmpeg developers
   built with gcc 11.2.0 (crosstool-NG 1.24.0.498_5075e1f)
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9559>
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