-vf "scale=-2:'min(${HEIGHT},ih)'"

is added to the ffmpeg CLI to cause it to use an even width pixel at the same HEIGHT as original

And audio works too (with 720p video fragment):

How to use G'MIC filters on video

I spent some time trying to figure out how to apply G’MIC filters to videos. I am fairly sure G’MIC has an option to do this directly but could not find it and decided to make a bash script anyway, as a learning exercise. This cobble-slop comes from a hundred scripts around the globe.

Lime Bar (www.limebar.space)

Still a work in progress.

Show me if you make anything interesting with it!

gmic_video.sh -i pexelsInput.mp4 -o processed.mp4 -f "fx_charcoal 65,70,170,0,1,0,50,70,255,255,255,0,0,0,0" -f "fx_rotate_tiles 5,5,15,3,3,1.8"

fx_diffusiontensors 10,50,50,5,3,1,0.15,1,0,3,0

for the record this is really slow on my crap PC and some filters are more time intensive than others -- definitely want to scale video to desired output size first

for example these settings yield this filter input

-f "fx_charcoal 65,70,170,0,1,0,50,70,255,255,255,0,0,0,0"

A variant may be to use that same grid breakdown but use it in a vert. column 3-5 squares wide, have a sort of wave fliping to b/w that washes from L>R.

Neat!

Can you share the script?