I test a lot of software for reviews for NeatNetTricks.com
I'm currently testing Applian's "ReplayCapture Suite". $79
The converter as a stand alone is $29.95 It converts video, audio, rips/burns & copies DVD, works with flv, iPod/iPhone.
It does a ton of stuff including converting almost anything.
The video converter module works sweet. It dumb simple. Just drop whatever file and select MP4 output. I just converted 3 Qik video files over to MP4.
It also captures .flv from the web as well as audio MP3 etc. it has a "splitter/joiner feature that I haven't tried yet.
Costs money but works great.
Capture Streaming Video and Record Streaming Audio