Convert video tape to DVD

I'm trying to convert some video tapes into DVD. First I captured the video into MP2 format using PowerVCR, then burnt the MP2 files into DVD format using Nero 6. But when I tried to view the DVD on my computer (with a DVD player software), I could only see the picture but no sound. Then I tried to open the file on the DVD, I could be able to see the pics and the sound, but the pics and sound are asynchronized. Does anyone out there know the probelm? And do you know if there's a software that can capture the video directly onto the DVD without the MP2 conversion step as I'm using?

Thanx in advance.

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