Invalid chunksize is a valid error message for that stream since that is what the BBC sends. Try this command works on a SuSe system on Radio 2 mplayer -vc null -vo null -cache 128 -af volume=0,resample=44100:0:1,channels=2 rtsp://rmlivev8.bbc.net.uk/farm/*/ev7/live24/radio2/live/r2_dsat_g2.ra