I just recorded live RTMP .FLV video stream from Blog TV with Replay Media Catcher. You can use the following tutorial to learn more:
www.blogtv.com: How to record free streaming video from Blog TV

After recording the FLV video with Media Catcher, I was able to convert it to .mp4 iPod/iPhone video using built-in converter.

So please provide more details if you need any more assistance.