Mailing Lists: Apple Mailing Lists
 Image of Mac OS face in stamp
Re: How reliable is GetMovieTime()
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: How reliable is GetMovieTime()

On Monday, February 18, 2002, at 08:29 AM, Bob Sabiston wrote:

Yeah, I don't see why GetMovieTime should be off, unless sound gets streamed
through the hardware and isn't as trackable as video stuff? The quicktime
file I am playing is just sound, does that make a difference? My loop runs
fast enough, around 30 frames per second, so it isn't just a case of the
returned time being off by the time I get it. By "request the time" I just
mean I call GetMovieTime.

Is it possible that Quicktime actually runs ahead of the playing sound,
loading information into buffers and whatnot, so that the time returned by
GetMovieTime is actually forward in time from the part that's actually
playing? Anybody know?

If GetMovieTime really is reliable, any suggestions as to what else could be
happening?

There is a latency due to the playout pipeline after QT submits sound to the Sound Manager, which can cause a static offset, but shouldn't give a growing drift as you describe.

Using OS X or turning off VM on 9 should reduce this latency.
_______________________________________________
quicktime-api mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/quicktime-api
Do not post admin requests to the list. They will be ignored.
References: 
 >How reliable is GetMovieTime() (From: "Bob Sabiston" <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2011 Apple Inc. All rights reserved.