Seth,
Synchronization is done at a lower level. You need to get the movie
time base of the movie you want to be the master and then set the
master time base for the movie you want to be the slave. Since this is
done at the Movie primitive level it doesn't matter that you are using
QTMovieLayers. This is the basic code you need:
QTMovie *master... // initialized somewhere
QTMovie *slave... // Initialized somewhere
TimeBase mtb = GetMovieTimeBase([master quickTimeMovie]);
SetTimeBaseMasterTimeBase(mtb, GetMovieTimeBase([slave
quickTimeMovie]), nil);
Then call play on both movies:
[master play];
[slave play];
The docs for both of those time base calls are here:
http://developer.apple.com/documentation/QuickTime/Reference/QTRef_MovieManager/Reference/reference.html
As a side note, you are going to have some performance issues playing
back two movies. You will likely need to go to using OpenGL to squeeze
out every bit of performance. I wrote a blog post on how to composite
a movie in a CAOpenGLLayer here: http://www.cimgf.com/2008/09/10/core-animation-tutorial-rendering-quicktime-movies-in-a-caopengllayer/
. You can use this technique to composite multiple video channels at
once.
HTH,
-Matt
On Jan 2, 2009, at 3:13 PM, Seth Willits wrote:
Howdy guys,
I have a need to make sure multiple QTMovieLayers are in perfect
sync. In other words, I need them to start at exactly the same time.
If you just do a few [movieN play] in a row, they're slightly off
from each other.
Has anyone done this? Any suggestions? (I'd really rather not have
to pull frames out of the movie and manually draw them myself or
something like that.)
--
Seth Willits
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
