in my opinion today the most optimal is Under the player https://trueplayers.ru/potplayer, it has all the most necessary functions and reads almost all formats. Plus, there is no advertising in it, unlike KMP
Without a doubt - Media Player Classiс: Home Cinema. Free, reads absolutely all formats of video and music, simple, clear, convenient, translated into a thousand languages, multifunctional, without ads and other nonsense. I have been using it for 5 years now and do not complain a bit. I recommend.
If you take a video player for your computer, I advise you to install BSPlayer. I like the simplicity of working with subtitles: turn them on and watch. Plus a simple interface with many functions.