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.
Video Overlay Extensions
The following additional items apply to video overlay devices:
MCI_OVLY_FREEZE_RECT
Specifies that the rc field
of the MCI_OVLY_RECT_PARMS data
structure contains a valid rectangle. If this flag is not specified, the
entire image is frozen.
MCI_OVLY_FREEZE_RECT_OUTSIDE
Specifies that the area outside the specified rectangle
is to be affected. If this flag is not specified then the area inside is
affected. This flag must be specified with the MCI_OVLY_FREEZE_RECT flag.