Specifies whether the current segment topology is empty.
Treat as a Boolean value.
This attribute is used with the MESourceStarted event.
The sequencer source sets this attribute to TRUE if the current segment topology is empty. If this attribute is TRUE, playback has not started yet. The default value of this attribute is FALSE.
The GUID constant for this attribute is exported from mfuuid.lib.
|Minimum supported client
||Windows Vista [desktop apps only]
|Minimum supported server
||Windows Server 2008 [desktop apps only]