audio/video synch

[frequency]

hey guys, i used psp video9 and clonedvd mobile and both are gettin me kinda frustrated here. when both programs encode my dvd movie to mp4 format, the video always seems to fastfoward throughout the movie. the audio plays at its normal speed. i tried different methods. i tried encoding it straight from the dvd and the other from the dvd ripped to my hdd. i have been unsuccessful. if anyone has encountered this problem and has fixed it. let me know as well. i have had success with other formats(avi.,mpeg,mpg,mov.).