That is really a wierd problem ,that when I try to convert any video from one format to another ,I always get an unsycronized file where the video is always leading the audio by nearly 1 second,I even tried many software like xilisof,Imtoo,and much more still the same problem with them all.anybody has any idea what is wrong? Thanks.

Sounds like a codec problem I used to have this until I downloaded the proper codec to fix it. I forget the name of it so you will have to google. Also when converting from PAL to NTSC the audio doesnt get converted with the video so with the difference in frame rate the audio is behind the video, it starts out as a small difference then as the film progresses the difference is greater.