Start recording with your stream capture software such as Replay Media Catcher or WM Recorder first and then

• open your web-browser,
• navigate to a web-page with an embedded player
• and play the stream.

When I tried to record with Replay Media Catcher, I found a URL which began with "http://" and had ".flv" at the end. You can use these terms as filters for URL Snooper.

The HTTP flash .FLV video is cached when you view it. So either grab it from the cache folder of your browser or empty the cache and try to record the video.