Thanks if you're reading this. First of all, I got to say that I have Ubuntu 12.10 (I had 12.04 before, and it was playing videos great, but then I upgraded it).
Ok, so, I'm watching some video and then it just stops moving but the audio keeps up. The video keeps running when I move the mouse.
I tried playing a video on a Ubuntu 13.04 liveCD, but I can't install anything and the default video player needs codecs to play .flv videos.