According to persistence of vision man can see 24 frames per second so that he know it is moving, so sounds made in second should be synchronized by 1/24 so that lips and vocal transmission should not over lap that means it seems real time voice takings. Now a days good mechanism did it so splendid way that we forgot about synchronizations, but in movie in order to reduce noise and other ambient sound lying there you should use frame per frame adjustments also.
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