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MCI_UNFREEZE (VIDEO OVERLAY)
 
        This MCI command message restores motion to an area of the video
        buffer frozen with MCI_FREEZE. This command is part of the video
        overlay command set. The parameters and flags for this message
        vary according to the selected device.
 
Parameters
        DWORD dwFlags
            The following flags apply to all devices supporting
            MCI_UNFREEZE:
 
            MCI_NOTIFY
                Specifies that MCI should post the MM_MCINOTIFY message
                when this command completes. The window to receive this
                message is specified in the dwCallback field of the data
                structure identified by lpFreeze.
 
            MCI_WAIT
                Specifies that the unfreeze operation should finish
                before MCI returns control to the application.
 
            MCI_OVLY_RECT
                Specifies that the rc field of the data structure
                identified by lpFreeze contains a valid display
                rectangle. This is a required parameter.
 
        LPMCI_OVLY_RECT_PARMS lpFreeze
            Specifies a far pointer to a MCI_OVLY_RECT_PARMS data
            structure. (Devices with additional parameters might replace
            this data structure with a device-specific data structure.)
 
Return value
        Returns zero if successful. Otherwise, it returns an MCI error
        code.
 
Comments
        This command applies to video overlay devices.
 
See also
        MCI_FREEZE
 
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