I’ve been using my presets with Soqueroeu-TV’s Backgrounds for this same purpose just haven’t shared any screenshots or videos for copyright reasons.
I find the FFMPEG limited in what formats it likes to play compared to LAV Filters. I wish whoever maintains the core can provide some updates to make it more universal on modern formats.
You can also talk to @Duimon, @soqueroeu, @TheNamec, @Orionsangel and @hgoda90 for assistance with things like the double bezel and implementing and integrating my presets and HSM Mega Bezel with different graphics and overlays.
They focus mainly on that while I’m not a graphic artist. I mainly focus on developing CRT Shader Presets that affect the pixels on the tube itself, giving it a more CRT like look and feel.
Also, could your FFMPEG core be automatically switching back to GLCore due to a Core Override you might have saved?