No Audio captured when buring VCD using Nero 6

I tried to burin VCD using Nero 6 from AVI file. The buring process was successful, when I played it on my VCD player, the pictures were great, but no audio, like a silent pcitures. I tried to play it on computer too, same no sound. I email Nero support they asked me to upgrade the firmware which I did, but did not work. They can not do anything more. can somebody help me?