Problem in displaying the image over the playing video.

void CVMR9Dlg::OnBnClickedDrawimage()
{
        pVmr->QueryInterface(IID_IVMRMixerBitmap9, (void**)&pMixerBmp);
	ZeroMemory(&alphaBitmap, sizeof(alphaBitmap) );
	const float EDGE_BUFFER  = 0.04f;
	CDC * pdc = GetDC();
	CDC mCompatibleDC;
	HBITMAP hBitmap =LoadBitmap(AfxGetApp()>m_hInstance,
                                    MAKEINTRESOURCE(IDB_BITMAP1));
  	BITMAP bm;
        GetObject(hBitmap, sizeof(bm), &bm);
        int mBitmapWidth = bm.bmWidth;
	int mBitmapHeight= bm.bmHeight;
	mCompatibleDC.CreateCompatibleDC(pdc);
	mCompatibleDC.SelectObject(hBitmap);
	CRect reSrc(0,0,mBitmapWidth,mBitmapHeight);
	CRect reDst;
	//mVideoClass.ShowImage(&mCompatibleDC,reSrc);
	alphaBitmap.dwFlags |= VMR9AlphaBitmap_hDC;
	alphaBitmap.hdc = mCompatibleDC.m_hDC;
	alphaBitmap.rSrc = reSrc;
	CRect mRect;
	mRect.SetRect(0,0,45,75);
        LONG cx, cy;
        pWc->GetNativeVideoSize(&cx, &cy, NULL, NULL);
	// This value is used to reposition the bitmap in composition space.
	float fBmpCompWidth = (float)45 / (float)cx;
       //rDest specifies the destination rectangle in composition space (0.0f to 1.0f)
        alphaBitmap.rDest.right  = 1.0f - EDGE_BUFFER;
	alphaBitmap.rDest.left   = 1.0f - fBmpCompWidth- EDGE_BUFFER;
	float mTop = (float)(cy - 75) / (float)cy - EDGE_BUFFER;
	alphaBitmap.rDest.top = mTop;
	float mBottom = 1.0f - EDGE_BUFFER;
	alphaBitmap.rDest.bottom = mBottom; 
	pRect = alphaBitmap.rDest;
	// Set the transparency value (1.0 is opaque, 0.0 is transparent).
        alphaBitmap.fAlpha = 0.0;
	// Set the COLORREF so that the bitmap outline will be transparent
	alphaBitmap.dwFlags |= VMR9AlphaBitmap_SrcColorKey; 
        alphaBitmap.clrSrcKey = RGB(0, 255, 0);
	pMixerBmp->SetAlphaBitmap(&alphaBitmap);	
}