Xvid Video Squeezed Vertically

Was trying to launch a video from Sapphire that is in widescreen. For video is says "Xvid (Perian), 720 x 304 (446 x 304), Millions"


When the video is played it appears that it has a 4:3 aspect ratio even though it is a widescreen movie. Does anybody know of a way that I can fix this?


Many thanks!