Comment 12 for bug 1103236

Mplayer is at the top when the video is played directly and in both modes you provided( -vo xv and -vo gl) , just like with vlc. Mplayer -vo xv is a lot better quality than mplayer -vo gl though; probably the best it's performed so far.

Also as previously stated-- the issue occurs with every media player, youtube videos (html5 and flash). Any HD video on youtube is really bad quality in HD (especially 1080p) but in Mac OSX all players run with exceptional quality and without lag in all videos.