video skills needed

Is there anybody who could fix a video clip for me? The problem is that the audio doesn't synch right with the video--it starts out okay but then there are some glitches in the file, or something, and it gets more and more out of synch.

It's 7:57 minutes long, a 30 MB .flv file (I tried to convert it to .avi but then I lost the audio entirely).

I will write a drabble/ficlet for whoever can help me.