Unlike the Video Mixing Renderer (VMR), the EVR does not have operational modes (windowed, windowless, and so forth). In particular:
The EVR does not support windowed mode. The application must provide the clipping window.
The EVR does not have a renderless mode. To replace the default presenter, call IMFVideoRenderer::InitializeRenderer.
The EVR does not have a mixing mode. The EVR always creates the mixer. If you have one input stream, it is not necessary to call SetNumberOfStreams to force the EVR to use the mixer.
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