Recently I have recorded some videotape recording to avi format by the using the AVS Video Recorder. After the completion I went back to check those converted video. While playing I have noticed that audio is about half a second faster than the normal video. I mean I listen audio first and then video comes. It is really distracting on playback. For that reason I have converted AVI to M4V but still there is no change. What kind of adjustments should I make to sync the video and audio simultaneously?