I can advice Macvide ScreenCap. It can record video from fullscreen and selected area. So, you should open your stream video player fullscreen and push record. Sounds easly, I think. Try...
here's a good article that lists some cheaper programs... http://www.freemacblog.com/mac-options-for-capturing-a-video-of-your-screen/ you could also try going to www.download.com or www.versiontracker.com and do a search for video capture in the mac osx section. I myself have never tried any of the screen video/audio capture products.. sorry.
Thanks Timmysw & Vantrells I will try what you suggusted. If you find anything new please let me know. Again Thanks