The following code illustrates how to freeze the motion of a video image.

    MCI_VID_RECT_PARMS mciFreezeParms;
    USHORT  usUserParm = 0;
    ULONG   ulReturn;

    /* Freezing OUTSIDE a sub-rectangle of the window */
    memset (&mciFreezeParms, 0x00, sizeof (MCI_VID_RECT_PARMS));
    mciFreezeParms.hwndCallback = hwndNotify;
    mciFreezeParms.rc.xLeft   = lX1;
    mciFreezeParms.rc.yBottom = lY1;
    mciFreezeParms.rc.xRight  = lX2;
    mciFreezeParms.rc.yTop    = lY2;

    ulReturn = mciSendCommand(usDeviceID,
                          MCI_FREEZE,
                          MCI_WAIT |
                          MCI_OVLY_FREEZE_RECT_OUTSIDE |
                          MCI_OVLY_FREEZE
                          (PVOID)&mciFreezeParms,
                          usUserParm);