I think that may not be on them. I think it would be a matter of tweaking the FFmpeg core in RetroArch but I don’t know if it has live video cropping as a feature especially when within the confines of RetroArch. Scaling? Maybe but that’s not really what I’m after.
Searching online I am getting either command line options or unrelated results about CRT gaming.
Are there collections of that or would I be doing what I am now and checking individual files?
Searching aspect ratio and 4:3 doesn’t seem to pull up much