Please look through the following related threads

How to record macromedia flash .FLV RTMP streams from MySpace and other web-sites
http://stream-recorder.com/forum/showthread.php?t=16

Getting/Capturing/Downloading .FLV flash videos streamed through the http protocol
http://stream-recorder.com/forum/showthread.php?t=81

How to download video from Gofish.com and Foxnews.com -http flash .flv and .swf video
http://stream-recorder.com/forum/showthread.php?t=140

And here is a flash download FAQ
http://all-streaming-media.com/strea...load-flash.htm

One more thing. You may use flash decompiller to get audio from downloaded flash files.

If you post a URL I will try to provide more details.