I've been using Haruna for a while instead of VLC because it works with Wayland. Menus can be hidden, lots of options: configurable hotkeys, VAAPI enabled, allow multiple instances, etc. It remembers position in last video when reopened, overall it's very nice.
Need to try it out!
This could be the Qt replacement for Celluloid, a modern flatpacked MPV GUI
mpc-qt is also pretty good
No flatpak, but could be worth the effort.
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