It’s cool to see more people writing posts and experimenting on this topic. I was surprised at how little info I could find trying to research this about a year ago, and spent a decent chunk of this year experimenting with trying to create vintage/retro video filters using FFmpeg. If anyone is curious, I shared a bunch of my notes on this topic here a little while ago: https://zayne.io/articles/vintage-camera-filters-with-ffmpeg
Disclaimer: I’m still an FFmpeg noob