I have apple macbook pro. In which I have a video file. When I play these file using the PREVIEW it works just fine. But when I play these video file using the QuickTime player it plays for few seconds but after that it stops and when I forward or rewind the video then the audio will only play for certain sec. these all problem is only with my QuickTime and not with PREVIEW. Does anyone know how I can work these file with my QuickTime?