Movie problems

I’ve been using the MediaDisplay and MediaController components to show an MPEG movie but everytime I try to import the movie (so I can export it as a flv movie) I get a message in the dialog box warning me

Note: No supported audio track in this file was detected

Doesn’t happen with AVI’s but it does with MPEG’s

The end result is that I can see the movie in Flash and it streams and everything looks ok, but I can’t hear it.

Can anyone show me a way to display these movies without having to import them and then export them as FLV’s or is there a different way to import MPEG’s that I’m missing???