#53 Audio off with stream video (realplayer)

[Revuelta]

I am trying to watch and hear this stream address (for
RealPlayer):

rtsp://147.102.247.3:5554/encoder/tv.rm

The video image is ok, but I am cannot hear the audio. Is there
anything I must install or change? Audio settings are ok in
preferences.

I am using a PowerBook G4/500 with 756 RAM and MacOs 10.3.5.

Thanks in advance for your help.