Hello. everyone I am very frustrated can anyone please help me out.

This is my problem I am tryint to convert a 2file svcd to dvd. I am using dvd santa, the problem is that when the conversion is over I have audio for 57 seconds and then after that I have no sound. What could be the problem ? I used the guide on this site am i missing something.

I tried using winavi but I got an out of sync issue with that method. So Iam very confused. Thanks