Re: QTMovie grabing while playback

FROM : Jean-Daniel Dupas
DATE : Wed Apr 23 20:15:39 2008

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.