I have MPlayer 1.0pre6-3.4.2 and mplayerplug-in-2.80-13.1. When I play videos on Firefox, I get no video and when I play it manually through mplayer command line, I get: The selected video_out device is incompatible with this codec. FATAL: Could not initialize video filters (-vf) or video output (-vo). I mainly want to play videos in firefox. What's up?