Hacker News Reader

Probably not what you are looking for, but I hacked this together a while ago just for fun: http://tunetab.us :)

I don't know about local files, but mpsyt is great for listening to music on YouTube.

Yeah, I use it already, it's great. Alas I need to run something else for the local library.

I would have hoped there's a program that can do both.

Mopidy with a cli mpd client.

mpv