Custom event type. You can use this event type to define custom events for your component. Use the extended event type to identify the event. The extended event type is a GUID value associated with the event. For more information, see IMFMediaEvent::GetExtendedType.
Possible values retrieved from IMFMediaEvent::GetValue include the following.
||No event data.
|Minimum supported client
||Windows Vista [desktop apps only]
|Minimum supported server
||Windows Server 2008 [desktop apps only]