Specifies the start time of the presentation.
Treat as a LONGLONG value.
To get this attribute, call IMFAttributes::GetUINT64.
To set this attribute, call IMFAttributes::SetUINT64.
This attribute specifies the position in the source where playback starts, in 100-nanosecond units, relative to the start the source. If the attribute is not set, playback starts at zero (the start of the file). For example, to start playback at the 5-second mark, set this attribute to 50000000. Set the attribute on the source nodes in the topology (nodes with type equal to MF_TOPOLOGY_SOURCESTREAM_NODE). Set the attribute before calling IMFMediaSession::SetTopology.
This attribute is a signed value, although it is stored as a UINT64. However, negative values are not meaningful.
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]|