How to access the content of BITBLT ?

Blitz3D Forums/Blitz3D Userlibs/How to access the content of BITBLT ?

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I'd like to capture a Frame of the MCI Avi player directly, but whatever I do, it writes to the screen. If I minimize the mci objects HWND, blitblit delivers trash, it really seems like i HAVE to capture it on the screen, although I'd prevere to do so "offscreen".