Re: using QTNewGWorldFromPtr to switch offscreen buffer

Subject: Re: using QTNewGWorldFromPtr to switch offscreen buffer
From: Sam Bushell <email@hidden>
Date: Mon, 2 Jul 2007 12:59:07 -0700
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"Christian Bechette" <email@hidden>

I wrote some code that basically changes the offscreen buffer on a frame by frame basis in between MoviesTask calls, my goal is to have quicktime draw into my own buffers which I can then use for purposes other than rendering to the screen. The code I have now is relatively slow I'd like to have your inputs on how I can make it more efficient. [..] Can anyone please provide some pointers as to what I could do to speed things up, maybe use a different subset of the quicktime API?

Check out the modern sample code that uses CoreVideo-based APIs to enable multi-buffer decompression, such as:

http://developer.apple.com/samplecode/CIVideoDemoGL/index.html http://developer.apple.com/samplecode/QTQuartzPlayer/index.html http://developer.apple.com/samplecode/MovieVideoChart/index.html http://developer.apple.com/samplecode/CaptureAndCompressIPBMovie/ index.html

Sam Bushell
QuickTime Engineering


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