My favourite feature of mpv is small but neat: going frame-by-frame forwards and backwards with the keys "." and ",". VLC can step forwards, but not backwards, which frustrated me a fair bit, because I like first stepping really fast forwards to go into the general vicinity of the frame I wanted to catch, necessarily overshooting the target a bit and then backing off a bit and narrowing down the frame with greater precision. VLC didn't allow me to do that, overshooting meant I needed to do the whole thing all over again; but mpv got me covered.
And worse yet, on VLC, often after single-stepping enough times, the video player or decoder stops advancing on pressing e. Resuming playback will either take a while to start playing or stop the file altogether.
