ffmpeg中有两个debanding filter
deband

    ffmpeg -i input.mp4 -vf deband output.mp4

gradfun

    ffmpeg -i input.mp4 -vf gradfun output.mp4
https://blog.csdn.net/zhoudegui88/article/details/108987506

参数调节:

Remove banding artifacts from input video. It works by replacing banded pixels with average value of referenced pixels.

The filter accepts the following options:

1thr
2thr
3thr
4thr
https://ffmpeg.org/ffmpeg-filters.html
http://underpop.online.fr/f/ffmpeg/help/deband.htm.gz
https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/manipulating_video_colors/deband.html

Apply the filter with a 3.5 strength and radius of 8
gradfun=3.5:8
http://underpop.online.fr/f/ffmpeg/help/gradfun.htm.gz
 

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