Yes, but the program has the ability to load an avi file and create a separate sound stream. Its recommended as many avi files will give a/v synch errors when writing to DVD. I use it for all my avi movies.

Give it a shot. It may not work but it takes only a minute or so to create a wave.

Edit: Just noticedy you successfully got a video file, so this should allow you to use the audio file to fill in the missing sound.