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Article #361

Re: What are the requirements on audio/video synchronization?

#361
From: Eric Miller
Date: Wed, 12 Aug 1992 19:34
22 lines
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In article <1992Aug7.171104.9943@waikato.ac.nz> ldo@waikato.ac.nz (Lawrence D'Oliveiro, Waikato University) writes:
>In article <14358@borg.cs.unc.edu>, jeffay@jeffay.cs.unc.edu (Kevin Jeffay) writes:
>>
>> Greetings -- I am trying to determine the requirements on lip synchronization
>> for applications such as video conferencing. <deleted stuff>  ... For
>> example, can people tell if audio is say 50ms. ahead or behind the video
>> (and does it bother them)?
>
>Speaking entirely from personal experience, I'd say people would be pretty
>tolerant of discrepancies in synchronization between audio and video. I think
>you could have a shift of maybe a tenth of a second without it becoming really
>noticeable.

Unfortunately, I don't have a documented reference for these figures, but I
have often heard the numbers 30-40 ms used as a worst case for lip sync.

Eric Miller

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*  The opinions expressed here are mine, and may not reflect those of     *
*    Microware Systems or its other employees.                            *
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Message-ID: <1992Aug12.193425.18140@microware.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!mcrware!eric
References: <14358@borg.cs.unc.edu> <1992Aug7.171104.9943@waikato.ac.nz>

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Newsgroups: comp.multimedia
Path: arc1-ca.pugleaf.net!sparky!uunet!mcrware!eric
From: eric@microware.com (Eric Miller)
Subject: Re: What are the requirements on audio/video synchronization?
Message-ID: <1992Aug12.193425.18140@microware.com>
Summary: 30-40 ms
Keywords: lip sync
Sender: mcrware!ericm
Nntp-Posting-Host: rama
Organization: Microware Systems Corp., Des Moines, Iowa
References: <14358@borg.cs.unc.edu> <1992Aug7.171104.9943@waikato.ac.nz>
Date: Wed, 12 Aug 1992 19:34:25 GMT
Lines: 22