It is common in video player software these days to use neural network based filters to upscale and downscale, eg see https://artoriuz.github.io/mpv_upscaling.h

It is common in video player software these days to use neural network based filters to upscale and downscale, eg see https://artoriuz.github.io/mpv_upscaling.html https://artoriuz.github.io/mpv_upscaling.html