I know MPlayer worked fine before. I've re-installed Mint a few times, though.
Well, here's the problem:
When I try to play a file I get an error message saying "Error opening/initializing the selected video_out (-vo) device." If I click "OK" it will go on to playing the audio while it doesn't even show a video window. It seems to happen regardless of what file format I'm trying to play. I really can't make out what it's supposed to mean. (I have a feeling it might be something stupidly simple, though... <.<)