If you have a mp4 video file where the audio and video are out of sync this is how to sync them
Programs used
1.)
http://www.aoamedia.com/audioextractor.htm2.)
http://www.womble.com/products/dvd.html Download the free trial
What to do1.) Install all the programs
2.) Open up AoA audio extractor and select you video file by clicking on add file and navigating to the place where the mp4 is. Leave all the settings alone and click start.
3.) When its done open up Womble MPEG video wizard DVD and click on the folder at the top with the arrow
4.)navigate to c:/myaudio/filename.mp3
5.)click on the file with the arrow again and navigate to where you have the video
6.)Drag the video file to the thing with the camera and the audio file to the thing with the violin
7.)right click on the camera and click mute
8.)make shure both the audio and video line up
9.)press the red dot button on the bottom and export it as an mp4 again
All your problems fixed!