Naked Science Forum

Life Sciences => Physiology & Medicine => Topic started by: CliffordK on 06/07/2012 00:42:55

Title: Why is a delay between video and audio so annoying?
Post by: CliffordK on 06/07/2012 00:42:55
Most of us can not lipread.  Or at least we don't think we can.

So, why is a delay between video and audio in a film so annoying?

In fact, it seems to be worse to have a delay of second or so than having a film that is dubbed.
Title: Re: Why is a delay between video and audio so annoying?
Post by: Geezer on 06/07/2012 01:05:47
The visual information my be redundant, but we seem to process it anyway. If it's inconsistent with the audible information, our brains complain!

I don't think it makes much difference which is lagging - it's just the fact that it's inconsistent.
Title: Re: Why is a delay between video and audio so annoying?
Post by: cheryl j on 06/07/2012 02:29:11
Plus its usually a crappy movie set in ancient Greece with  Hercules throwing paper mache boulders.
Title: Re: Why is a delay between video and audio so annoying?
Post by: evan_au on 07/07/2012 13:02:07
Our brains unconsciously know that light is faster than sound. So our brains are moderately tolerant of sound lagging behind the picture (up to 45ms), but are less tolerant of the sound arriving before the picture (15ms).

http://en.wikipedia.org/wiki/Audio_to_video_synchronization#Recommendations