Imho, mpv is better. It has better support for AV1, is faster, and has no problems with audio, but VLC has a better interface with more options. I made the transition from VLC to MPV a few months ago and don't regret it.
I want to but don't know how or what commands to run to see what the issue exactly is. But I've tested on my 1650 and my Rx 5500. If you have 4GB of VRAM and try to game gnome does not like that. On KDE it will slow to a crawl but won't crash.
This is different. I'm talking about video memory. But yeah systemd oomd is shite. It works sometimes, when it does it takes a while of waiting before it does anything
Decibels seems to be an audio player to playback individual files, like maybe a voice memo or single music track. I personally use Gapless when I want to play music with shuffle and playlists.
I'm sure it's very nice but tying an audio player app, or a text editor, an rss reader, or any other such tool to one specific desktop environment is an unbearably stupid idea and makes me think that both Gnome and KDE have made a seriously wrong turn somewhere.
I was annoyed that Gnome didn't have a very basic "sound file player", everything polished wanted to be something more, like support for music libraries, etc. I downloaded a single wav file, I want to listen what's in it, there was no perfect app for that.