Mpeg to DVD movies...no sound?

[evewasdyn]

I tried a few simple mpegs to DVD using Nero Vision Express. Only prob is ...no sound at all.
Mind you, i did just use video i downloaded before to test(cough,porn). But i tried it a few times, and tried playback on a Poineer DVD player, and my sisters cheap $100 Wal-Mart one.
Now heres the kicker...it plays with sound on 2 different DVD roms in my computers.

Is this common. Or do i need yet another Plugin for converting sound file format as well?