|Microsoft DirectShow 9.0|
Signals that the current subpicture stream number changed for the main title.
DWORD value indicating the new user subpicture stream number. Subpicture stream numbers range from 0 to 31. Stream 0xFFFFFFFF indicates that no stream is selected.
Boolean value that indicates the subpicture's on/off state.
The subpicture can change automatically with a navigation command authored on disc as well as through application control using IDvdControl2.
This event is raised in all domains.