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Sometimes my media/movie won''t show on the screen if I use Fullscreen Mode, but it worked fine if I used windowed mode. can somebody tell me why ?? This is the code that I use to play my media file :
void CGameApp:layFMV(const unsigned short *fname)
{

	IGraphBuilder *pGraph;
    IMediaControl *pMediaControl;
    IMediaEvent   *pEvent;
	IVideoWindow    *pVidWin = NULL;

    CoInitialize(NULL);
    ShowWindow( m_hWnd, SW_SHOWDEFAULT );
	HRESULT hr;		
    UpdateWindow( m_hWnd );
    // Create the filter graph manager and query for interfaces.
    CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 
                        IID_IGraphBuilder, (void **)&pGraph);
    pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
    pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
	pGraph->QueryInterface(IID_IVideoWindow, (void **)&pVidWin);

    // Build the graph. IMPORTANT: Change string to a file  on your system.
    pGraph->RenderFile((const unsigned short*)fname, NULL);
	
	//Set the video window.
    pVidWin->put_Owner((OAHWND)m_hWnd);
    pVidWin->put_WindowStyle(WS_CHILD);

	pVidWin->put_Visible(OATRUE);
    RECT grc;
    GetClientRect(m_hWnd, &grc);
    pVidWin->SetWindowPosition(0, 0, grc.right, grc.bottom);

	long lEventCode=0x0000;
    long lParam1;
	long lParam2;

    // Run the graph.
    while(!(m_pDInput->GetAction()&BESCAPE)&&(lEventCode!=EC_COMPLETE))
	{
		pMediaControl->Run();
		pEvent->GetEvent(&lEventCode,&lParam1,&lParam2,100);
	}

	pMediaControl->Stop();
    // Wait for completion. 
   // long evCode;
    //pEvent->WaitForCompletion(INFINITE, &evCode);

    // Clean up.
    pVidWin->put_Visible(OAFALSE);
    pVidWin->put_Owner((OAHWND)m_hWnd);  
	pEvent->Release();
    pMediaControl->Release();
    pVidWin->Release();
    pGraph->Release();

} 
I hope it;s not too long, but it''s basically ripped from the docs.

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