Re: Grab image of individual frame from QuickTime ActiveX?

• Subject: Re: Grab image of individual frame from QuickTime ActiveX?
• From: John Cromie <email@hidden>
• Date: Wed, 01 Mar 2006 00:24:20 +0000
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Thanks for the suggestion -- but is there any way to do this from the QuickTime ActiveX control?
 
(CopyFrame(...) isn't documented for the ActiveX control, and results in a "not found" error if I try to use it with int  or VARIANT or no argument.)

From: John Cromie [ mailto:email@hidden]
Sent: Thu 23/02/2006 21:18
To: email@hidden
Cc: Dutton, Sam
Subject: Re: Grab image of individual frame from QuickTime ActiveX?



At 20:05 23/02/2006, Sam Dutton wrote:
>I'm using the QuickTime ActiveX control in a Windows XP C++ app using
>the Qt framework.
>
>Is there any way to get an image of a single frame? I'm doing
>screengrabs for the moment, which is pretty hacky, though it works fine
>(just for a preview).

One way is to use the CopyFrame(VARIANT Time) method of QTMovie to
put a grab of the specified frame on the clipboard. Then in Qt you
can easily use QApplication::clipboard() (or the Win32 clipboard
functions) to get the image in a useable format.

Something like:

     VARIANT vTime;
     VariantInit(&vTime);
     V_I4(&vTime) = 0;      // or whatever movie time you want e.g. PosterTime

     movie->CopyFrame(vTime);

     QPixmap pm = QApplication::clipboard()->pixmap();
     if ( !pm.isNull() )
     {
         // Draw movie frame, etc.
     }

Hope this helps.

_________________________________________________________
John Cromie
Skylark Associates Ltd.             http://www.skylark.ie

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