Contains the start time at which a media source restarts from its current position.
Treat as a LONGLONG value.
This attribute is used with the MESourceStarted event. The attribute is relevant when the event data is empty (VT_EMPTY), which indicates that the media source started from the current playback position. In that case, the MF_EVENT_SOURCE_ACTUAL_START attribute specifies the actual starting time. If the event data is VT_EMPTY and this attribute is not set, the starting time is assumed to be zero.
When the MESourceStarted event data contains the start time (VT_I8), this attribute should not be set.
This attribute is a signed value, although it is stored as a UINT64.
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]|