sound and youtube videos?

[budwieser]

Why does it seem that an awful lot of the music videos on youtube seem to be out of synch? Is it me or are they?
Example .....http://www.youtube.com/watch?v=BssFt...elated&search=

[icestar2]

That's very much out of sync. Ok song but boring video.

[Pedro1]

Sure is way way out man.

To be fair, A/V out-of-sync problem is not limited to videos on PCs. In theory and in practice, all digital video equipment have A/V sync problem.To the dismay of digital video enthusiasts, it is a fact that Audio/Video out of sync problem is unique to, or at least much more serious in, digitised video than in analogue video. VHS/Hi8 or other analogue video tapes have their audio signal recording physically attached together with their video recording media at a fixed position, therefore sychronised video/audio inputs always results in sychronised video/audio recording. When anaologue video tapes are being played back, as long as the recording materials are not physically deteriorated too much, analogue video and audio are always played back in sync. In digital video recording and play back, things can be very different. Synchronised video/audio input can be easily digitised as A/V out-of-sync, and synchronised digital video/audio recording can be played back out-of-sync.