MF_TOPONODE_MEDIASTART attribute
Specifies the start time of the presentation.
Data type
UINT64
Treat as a LONGLONG value.
Get/set
To get this attribute, call IMFAttributes::GetUINT64.
To set this attribute, call IMFAttributes::SetUINT64.
Applies to
Remarks
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.
Note
If you manually insert a decoder into the topology, you must also set the MF_TOPONODE_MARKIN_HERE and MF_TOPONODE_MARKOUT_HERE attributes on the decoder node.
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.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
|
See also