Re: QTMovie grabing while playback

FROM : Randall Meadows
DATE : Wed Apr 23 19:58:02 2008

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).