One of my main entertainment on a computer is Twitch. I even has multiple tab open with multiple streams, so I can switch like with TV. Wow, I feel old now.
I also like to make my system minimal and I love command line software. With i3 you can have a video player left, and chat on the right side in a terminal window.
Because mpv is minimal and it's fast, and can play everything. I think it's based on mplayer probably.