Just taking a look here... It would probably be worth working from the rips themselves. When you extract the movies from the PSX verison you either need something that can read the videos themselves or you need to convert them to raw video/audio files and then covert to the format of your choice. So it would definitely be better to work with the raw AVIs just to avoid any compression issues caused by converting to MP4. The file size does make it a bit of an issue for file sharing though.
The issues I'm having with the free AI Upscalers though are with edge detection, especially around eys. Hair also alternates between great looking and painted on, but I'm definitely getting better results working from the raw files than the converted ones. https://drive.google.com/open?id=1JnxYpC8SmSyvb-pl-ZpWCcIm3ludNOMI
Yep, I find I have to use different AI models for different scenes then edit them back together. Sometimes different models between jump cuts
. It can be time consuming.
From my observations, it's not so much that the software has more trouble with eyes than anything else - it's just that our brains are way
more attuned to eyes. We're really looking for detail there, and we're far more sensitive to things like irises, eyelid curves, specular shines etc. in eyes either not looking realistically round, or distorting a bit when they move through an area that used to be a transition between pixels and the software hasn't done a perfect job of tracking the shape/motion between frames. If you're really looking for it, there's a lot of that going on throughout the image - we just really
notice it on eyes.