Re: QTMovie grabing while playback
Re: QTMovie grabing while playback
- Subject: Re: QTMovie grabing while playback
- From: "douglas a. welton" <email@hidden>
- Date: Wed, 23 Apr 2008 16:08:38 -0400
Bob & Randall,
If all you want to do is slap some arbitrary text over a movie, I
would suggest that you take a look at using QTMovieLayer and
CATextLayer as the mechanism for doing this. I don't have any code
that I can share with you on this, but a previous client project used
these two Core Animation objects with excellent results.
regards,
douglas
On Apr 23, 2008, at 2:39 PM, Bob Smith wrote:
On Wed, 23 Apr 2008 20:15:39 +0200
Jean-Daniel Dupas <email@hidden> wrote:
Le 23 avr. 08 à 19:58, Randall Meadows a écrit :
On Apr 23, 2008, at 11:30 AM, Bob Smith wrote:
On Apr 23, 2008, at 10:05 AM, douglas a. welton wrote:
QTMovieView has a delegate method
- (CIImage*) view: (QTMovieView *)Target_View
willDisplayImage: (CIImage *)New_Image
This method gives you a CIImage to play with before it is
displayed in the Target_View. Check the header file for
QTMovieView.h (near the bottom). I think the the MyMovieFilter
sample code uses this method.
I cannot find this method in the documentation, where is it
described? Is it in the public interface? This is the perfect
solution to a similar problem I'm having with a Cocoa app using
QuickTime, but I don't want to use undocumented private APIs.
I think he means QTCaptureView. It's not undocumented; you'll
find it in the QTCaptureView class reference material (available
in QT 7.2.1 and later).
Whether it's relevant for you or not depends on how you're
displaying the movie. I *think* (but am not 100% sure) that this
delegate method is only valid for this particular type of view
(which displays a video preview of a capture session).
This delegate method was also added to QTMovieView. It's really
helpfull for example if you want to apply some effect or if you
want to insert text in your movie.
Exactly what I'm trying to do, add text overlay to any movie being
played. I have been using the Core Video display link which is fine
most of the time, except for unknown reasons it doesn't work with a
streaming video source. QTMovieView plays streams just fine, so if
I can hook in to it's Core Image processing chain to add my
overlays, problem solved.
One question, is it correct to assume the delegate method might be
called on a secondary thread?
Thanks!
Bob
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden