[vlc-devel] Re: Perceptible Latency [was Re: Re: CVS Commit (fenrir)]

Stephan Assmus stippi at yellowbites.com
Wed Apr 30 08:28:29 CEST 2003

> cvs at videolan.org wrote:
> >Update of /cvs/videolan/vlc/include
> >Modified Files:
> >	vlc_config.h 
> >
> >Log Message:
> > * vlc_config.h: increased AOUT_PTS_TOLERANCE to 40ms, it avoids a 
> > lot of
> >resampling with some files while keeping good synchronisation.
> > Anybody has an idea of the maximum desynchronisation between audio 
> > and
> >video that still be imperceptible ?
> >
> >
> >  
> >
> The acceptable latency between audio is video is considered 
> imperceptible below 200ms but it really depends on the application.
> For basic interactivity everything below 250 ms is acceptable. 
> Everything below 150 ms is excellent.

250 ms means 6 frames in a cinema movie. I really don't think this 
would go unnoticed! 40 ms would probably be ok, as it is only about one 
frame. I'm certain I would notice a desynchronization of 2-3 frames. 
Maybe 250 ms is ok for interactivity, but not for a movie player. Do 
you know how much work is put into making the sound of a movie? Playing 
it back 6 frames to late definitely spoils it all. :-)


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