IMFVideoMixerControl interface (evr.h)

Controls how the Enhanced Video Renderer (EVR) mixes video substreams. Applications can use this interface to control video mixing during playback.

The EVR mixer implements this interface. To get a pointer to the interface, call IMFGetService::GetService. The service identifier GUID is MR_VIDEO_MIXER_SERVICE. Call GetService on any of the following objects:

  • The Media Session, if the topology contains an instance of the EVR.
  • The EVR media sink.
  • The DirectShow EVR filter.
  • The EVR mixer.
If you implement a custom mixer for the EVR, the mixer can optionally expose this interface as a service.


The IMFVideoMixerControl interface inherits from the IUnknown interface. IMFVideoMixerControl also has these types of members:


The IMFVideoMixerControl interface has these methods.


Retrieves the position of a video stream within the composition rectangle.

Retrieves the z-order of a video stream.

Sets the position of a video stream within the composition rectangle.

Sets the z-order of a video stream.


Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header evr.h

See also

Enhanced Video Renderer

Media Foundation Interfaces