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Re: CSequence and getSimilarity function

On Monday, Feb 24, 2003, at 21:41 Australia/Melbourne, Esteban Luengo wrote:

MoviePlayer myPlayer = new MoviePlayer (m);
MoviePlayer mp = (MoviePlayer)myPlayer;
myQTCanvas.setClient (myPlayer, true);

I need to write a process in
background mode. It is possible to compare 2 frames in a QTCanvas that is
invisble in the screen?. Thanks a lot.

so first - the problem - if you grab the canvas pixels for a movie, you DO NOT grab the hardware drawing overlay.

The hardware overlay (usually) gets used when ever the video is compressed with a codec that works best in a YUV colour space - eg: mpeg, dv, h263 etc etc.

So, you need to set the gworld of the movie to the offscreen QDGraphics and NOT add it to the QTCanvas. (ie: you must make your own movie controller etc - adding it to the canvas will CHANGE the gworld of the movie);

Putting the movie offscreen makes it render using all software... be aware - this is lower performance than using the hardware drawing (if you are trying to do this real time etc).

you could then use one of the compositor classes to draw this offscreen image to a onscreen one for monitoring...


cheers,

dean perry
abstract plane pty. ltd.
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References: 
 >CSequence and getSimilarity function (From: "Esteban Luengo" <email@hidden>)



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