Due to the intermittent motion of movie projectors and movie cameras, the sound cannot be located adjacent to the actual frames it is synced to, but instead must be offset by 21 frames (35mm). Because of this, a married print can not be edited, and thus should only be done when the picture and sound edits have been "locked", or finalized.
Due to the irregular movement of movie projectors and cameras, sound cannot be placed next to the actual frames it is synchronized with, but rather must be shifted by 21 frames (35mm). As a result, a married print cannot be edited, so it should only be done when both picture and sound edits have been "locked" or finalized.