Problem record RTMP flash video stream from ustream.tv

When i record a RTMP Flash stream from ustream using FLV Recorder it auto picks up the url and downloads which is great but once i stop the feed to finish it and load it up it shows the file as being 0b although while downloading it shows its picked up more than a good few mb. it saves a temp file showing the full file size but even that doesnt load in any flv players. So im pretty lost.

Replay Media Catcher can only download around 1mb of a stream from ustream before it mentions can only download a partial piece of the file.

I don't mind using screen capture programs but my problem i find is the audio goes out of sync with the video and when i try interlacing the file doesn't save as i tend to record over 1-3 hours of stream.

Any one got any good tips for me?