If i transfer say a large avi or wmv file via dvdsanta to make it vob files for dvd burning the sound disappears maybe 10 mins into the film clip and cannot be retrieved even though it is still in the original clip, also i notice sometimes its as if you pressed the ff button on a video player as the pic seems to slightly speed up, then slow down within a few seconds, that may throw the sound out but has anyone got any clues or experienced the same thing ?

cheers in advance