real and media player


hey guys
well i am using mac osx tiger on a apple imac g5,but i have a slight problem when it comes to streaming videos and audio. i cant seem to play them using windows media player or real. real plays the video, but no sound and wmp just says it doesnt support the format, even though i am sure it does. for example when i go to the bbc website and try to open there video player i get no sound on real and nothing on wmp. anyone know how to fix this.