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IEVRFilterConfig::SetNumberOfStreams method (evr.h)

[The component described on this page, Enhanced Video Renderer, is a legacy feature. It has been superseded by the Simple Video Renderer (SVR) exposed through the MediaPlayer and IMFMediaEngine components. To play video content you should send data into one of these components and allow them to instantiate the new video renderer. These components have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer or the lower level IMFMediaEngine APIs to play video media in Windows instead of the EVR, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Sets the number of input pins on the EVR filter.


HRESULT SetNumberOfStreams(
  [in] DWORD dwMaxStreams


[in] dwMaxStreams

Specifies the total number of input pins on the EVR filter. This value includes the input pin for the reference stream, which is created by default. For example, to mix one substream plus the reference stream, set this parameter to 2.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code Description
The method succeeded.
Invalid number of streams. The minimum is one, and the maximum is 16.
This method has already been called, or at least one pin is already connected.


After this method has been called, it cannot be called a second time on the same instance of the EVR filter. Also, the method fails if any input pins are connected.


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

See also

Enhanced Video Renderer