Using Ulead Dvd Workshop

I've got a a couple of NTSC Xvid files that I want to put on dvd by using Ulead, i've tried a few time to do this but I keep getting "Failed to convert video file", now I use to convert PAL divx but that was a little while ago and i'm just woudering if i'm meant to have some sort of correct settings for why it keeps on failing. The reason I want to try Ulead is that i've tried other ways but even though they seem to come out ok near the middle of a movie things seem to go a little out of sync but I don't remember that happening to me when using divx in ulead. So should frame size be anything inparticular aswell as video video data rate and audio bitrate ? I've tried it on 720 x 576, 3800 kbps so it will fill up the dvd-r and audio: 384
 
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