Celluloid is a simple media player that can play virtually all video and audio formats. It supports playlists and MPRIS2 media player controls. The design of Celluloid follows the GNOME Human Interface Guidelines, but can also be adapted for other systems that don't use client-side decorations (CSD). It is based on the mpv library and GTK.
Features:
I'd recommend the flatpak version of this app as it is less likely to be out of date. Works better than VLC for playing videos from my local sambashare media server. Only problem is I don't think there are any options for looking at info of the video being played such as resolution or bitrate but I think that goes hand in hand with this being a self-described "simple" media player.
Ever since 19.3, i've used the Celluloid that comes with it by default, and i'm a fan. It has played countless albums of lossless music and occasionally MP3's as well without a hitch. I've also used it as an aide for making .m3u playlist. No complaints here.
Music playback is audiophile quality. Offloads processing from cpu to hardware well. Very low noise and no errors, hiccups or bugs. One of the best playback programs for Linux.