Another possibility is:
because you are using compressed video format with a compressed sound format. and then re-rendering to a further compressed video format without changing sound file format.
It's got to do with how Group of Frames (GOP) work during compression and encoding
Convert the sound file to .wav format and your out of sync issues should not be a problem.
I can give more details if you can tell me what properties are your sound files and your original video files and what are you trying to make (eg for youtube)
Quote: Originally Posted by
KeithMoon2112 
Ok. I'm a drummer and i like to make drumming vidoes. Well we got a new
computer and Vista instead of XP. So the new movie maker is really stupid.
Everytime i get the music and the drumming perfectly togerther, and i save
it, i got to publish it. I publish it. Then i watch it, and the music and
video arn't together anymore!!!! some1 plz tell me wat to do. Thanx.