Re: Play loop issue when using QuickTime to play .qtz file
Re: Play loop issue when using QuickTime to play .qtz file
- Subject: Re: Play loop issue when using QuickTime to play .qtz file
- From: "John C. Randolph" <email@hidden>
- Date: Wed, 21 Mar 2007 11:30:06 -0700
On Mar 21, 2007, at 2:00 PM, Lucidian.Coaste.Strife wrote:
Hi Everyone.
I found some odd issue(as to me):
When you play the .qtz file with the QuartzComposer, you will find
there is no concept about the duration - in constract to
QuartComposer , when you play the .qtz file with the QuickTime
player, all of the .qtz files have the duration with the value of
30.0 seconds.
I discovered that when I played the .qtz file-"Particle
System.qtz"(You can search it through spotlight).
If you set the playing mode to loop, the render scene begins at the
blue-white center. When you reach the end at 30.0 seconds, you will
find the rendering operation completely return to very beginning.
However, when you play it with QuartzComposer, you will not find the
issue.
More clearly, you can open the file I mentioned above with QuickTime
and QuartzComposer simultaneously. Start both at same time, when the
time reaches to 30.0 second , you will understand what I mean.(The
quick time is set to the loop playing mode).
Can anyone explain how can this happen? Thank you all in advanced.
The problem you're seeing is due to the fact that Quicktime doesn't
really have a concept of a movie that goes forever, so when you play a
composition as a quicktime movie, there's a default duration that is
assumed. You can change that duration, although I don't remember how
off the top of my head. If you ask this question on the Quartz
Composer Dev list, I'm sure you'll get an answer very quickly.
-jcr
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