https://ffmpeg.org/ffmpeg-filters.html#elbg, https://ffmpeg.org/ffmpeg-filters.html#deband
deband
#! /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
l=128
l=64
l=8
l=4
limiter