elbg

doc

https://ffmpeg.org/ffmpeg-filters.html#elbg, https://ffmpeg.org/ffmpeg-filters.html#deband

see also

deband

Watch on youtube.com

#! /bin/sh
pref="`basename $0 .sh`"
ifn="Pexels Videos 1457810.mp4"
#
ffmpeg -y -i "${ifn}" -filter_complex "
[0:v]elbg=l=${l:-64}:n=${n:-1}
" ${pref}.mp4

l=256	00:00:00
l=128	00:01:11
l=64	00:02:22
l=8	00:03:33
l=4	00:04:44