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I have used this one and it worked well:

IplImage* frame_r = cvCreateImage(size, IPL_DEPTH_8U, 1);
IplImage* frame_g = cvCreateImage(size, IPL_DEPTH_8U, 1);
IplImage* frame_b = cvCreateImage(size, IPL_DEPTH_8U, 1);

    cvSplit(frame, frame_b, frame_g, frame_r, NULL);