"FFplay is a very simple and portable media player using the FFmpeg libraries and the SDL library. It is mostly used as a testbed for the various FFmpeg APIs. "

https://ffmpeg.org/ffplay-all.html

just install ffmpeg for ffplay sudo apt install ffmpeg (you probably already have it as it is core part of most distributions for video playback.

there is no gui for ffplay that i am aware of, its all controlled via the keyboard.

Ive been using rox-filer lately, the "set run action" makes it easy to have ffplay run as a sort of library front end, you could of course use any file manager but rox is simple and small and rocks.One click and i have whatever vid i want up a running or it can be run from the terminal lto get all the verbose format info as the video is playing.

few scrots.