mplayer should do that. also have a look at the -dumpstream option
if you want to save the file

* Steven M. Bellovin <smb@cs.columbia.edu> wrote:
| Is there any way to open an rtsp URL (for a .au file) on NetBSD?  I
| generally use either galeon12 or firefox-gtk as my browser.
|
| 		--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb

   -- Sebastian Prause