ulParam1 (ULONG)

      This parameter can contain any of the following flags:

      MCI_NOTIFY

        A notification message will be posted to the window specified in the hwndCallback parameter of the data structure pointed to by the pParam2 parameter. The notification will be posted when the action indicated by this message is completed or when an error occurs.
      MCI_WAIT
        Control is not to be returned until the action indicated by this message is completed or an error occurs.
      MCI_CONVERT
        Specifies that the image format will be converted to the OS/2 bitmap format. The default is the device-specific format.
      Digital Video Extensions

      The following flag applies to digital video devices:

      MCI_USE_HW_BUFFER

        If this flag is specified, a capture will be from the capture video buffer. If this flag is not specified, a capture will be from the movie element and not the contents of the capture video buffer generated by MCI_CAPTURE.
      Video Overlay Extensions

      The following flag applies to video overlay devices:

      MCI_GET_HW_BUFFER_PTR

        Requests a pointer to the hardware buffer.

        M-Motion specific: Not supported.

      MCI_USE_HW_BUFFER
        Indicates that the hardware buffer contains the image data.

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