Ultimate SMPlayer guide:
Download:
https://www.smplayer.info/en/downloadsUncheck mplayer during install, you'll only want the mpv backend.
It'll also automatically download youtube-dl for you.
In SMPlayer preferences go to Network section and set support to mpv+ytdl, quality whatever.
Want captions? Go to Advanced -> mplayer/mpv and put the following in the Options box:
>--sub-create-cc-track=yesWant to crop the 16:9 stream to 4:3 for optimal viewing and screenshots? Same section as above but as a video filter:
>crop=iw*.75:ih:(iw-(iw*.75))/2:0 
