Very nice work...but...

[Zibri]

... to make this filter kick serious ass you should do this:

1. implement shader loading
2. make it compatible with shadertoy.

This would open a world of filters to apply to any video/audio source.

Unfortunately I am not able to do that...but it should be easy for you (and today ffmpeg 4 has been released!)

[moea]

I have a version of it that loads shaders from the filesystem, and one that supports ISF, but so far have tried to keep the public version simple.

[Zibri]

if it works with shadertoy shaders I would like to try it

[Zibri]

or even better.. support a shader like this https://www.mameau.com/mame-glsl-shaders-setup/
would be great