In the broadcast world, audio/video sync can vary depending upon how much digital video action is taking place. The more "movement" in the video (action scenes), the longer it takes to process, compared to the audio stream. The sync difference is measurable in a piece as short as one minute long.
For more details, here is a link from a recent Broadcast Engineering describing how difficult it is to try and correct: http://broadcastengineering.com/test_measurement/maintaining-lip-sync/ The problem can be caused/corrected by equipment, source material, editors, and uplink/downlink operators. A transmission can have more than a dozen hops in it, with each hop introducing its own set of errors. However, there is no guaranteed solution out there yet. Digital TV is a perfect picture which will show up all of it's faults perfectly. :) Richard P. Steve Rigby wrote: > In fact, one can experience time shifts in > the amount of delay between audio and video as a program progresses. It may > be more or less out of sync at varying points in the program. A real > quality control issue, yet digital TV is touted a being a giant leap forward > in terms of quality. Not altogether true, obviously. > > Steve > > ************************************************************************* ** List info, subscription management, list rules, archives, privacy ** ** policy, calmness, a member map, and more at http://www.cguys.org/ ** *************************************************************************
