If the audio does not align with the actors' lip movements, it is often a processing delay rather than a file corruption. : Use a versatile media player like VLC Media Player . You can manually adjust audio delay by pressing the key (to move audio back) or
The solution often depends on the device or software you are using to play the file.
To permanently lock the corrected audio sync into the file without wasting hours re-rendering the whole movie: Download and open . File > Open your media file.