URL Snooper is not the best software for RTMP streams.

You can use CooJah + Blader for finding and downloading / capturing RTMP streams. You can also download / capture RTMP streams with freeware StreamTransport, Orbit Downloader / Grab Pro, shareware Replay Media Catcher, WM Recorder,...

See also:
FAQ: How to record/download/capture/save Adobe Flash .FLV video RTMP stream from embedded player
How do you use rtmp dump (rtmpdump tutorials)?