Vine Reveals Its Secret Recipe for Pitch-perfect Audio Loops

MP4s were never intended to loop. But for Vines, loops are the chief currency of success. Indeed, Vine keeps track of loops on each video (hit a million and you really have something).In order to solve the problem, Vine's original engineer and co-founder Dom Hoffmann realized he could trim the AAC audio and MP4 video by a fraction of a second on each end, ultimately cutting off .10 seconds to ensure that the audio and video start and end at the same time.