Best Video Player on Steam Deck in Game Mode (not VLC)

Best media player for Steam Deck that works offline with files. Ideal for music and videos that you’ve downloaded. It supports all needed formats and runs in game mode under SteamOS. It has controller support and UI is friendly to touch.
Supports mkv, mp4, avi, mov and others...
Many codecs supported.
It's easy to install. It runs right away, but it's not too easy to fully configure it.
Don't mention the name in the comments. It looks that this player is blacklisted by YT. But it's still just a player. Dunno why.