How to sync video and audio on a mp4 file?

Hi I need help on how to sync video and audio on a mp4 file I downloaded. The audio is behind and the video and nowhere in sync with the audio. I play the mp4 file on my phone same issue. play it on my computer same issue. Does anybody know of a program or a windows program that can help sync the audio and video... show more Hi I need help on how to sync video and audio on a mp4 file I downloaded. The audio is behind and the video and nowhere in sync with the audio. I play the mp4 file on my phone same issue. play it on my computer same issue. Does anybody know of a program or a windows program that can help sync the audio and video together on a mp4 file and thank you
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