Alllows the Enhanced Video Renderer (EVR) to mix the video within a rectangle that is smaller than the output rectangle, and then scale the result.
To get this attribute, call IMFAttributes::GetUINT32.
To set this attribute, call IMFAttributes::SetUINT32.
This attribute can be set on the EVR media sink. To set the attribute, use QueryInterface to query the EVR media sink for the IMFAttributes interface.
Setting this attribute has the same effect as setting the MFVideoRenderPrefs_AllowScaling flag on the EVR. See MFVideoRenderPrefs for a description of this flag.
The GUID constant for this attribute is exported from strmiids.lib.
Minimum supported client
|Windows 7 [desktop apps only]|
Minimum supported server
|Windows Server 2008 R2 [desktop apps only]|