Replay Media Catcher 4 in the RTMP recording mode and CooJah without Blader can capture RTMP streams in real time while you watch them.

You can also record such videos from screen using screen video capture software.

If you want other users to help you, you need to post the web-site name (or a web-page that you want to record from). Providing more details on the programs that you have tried is also useful.

p.s. If you want to record adult video chats, see the following forum:
http://stream-recorder.com/forum/vid...ideos-f40.html