IWMReader::SetOutputProps method (wmsdkidl.h)

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The SetOutputProps method specifies the media properties of an uncompressed output stream.


HRESULT SetOutputProps(
  [in] DWORD               dwOutputNum,
  [in] IWMOutputMediaProps *pOutput


[in] dwOutputNum

DWORD containing the output number.

[in] pOutput

Pointer to an IWMOutputMediaProps interface.

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.
The dwOutputNum parameter is greater than the number of output streams.
The method failed for an unspecified reason.


Manipulating an object retrieved by a call to GetOutputProps has no effect on the output media stream unless the application also calls SetOutputProps.

DirectX VA formats can be returned from GetOutputFormat, but if they are passed in to SetOutputProps, that method will fail because DirectX VA formats cannot be specified in this way. Therefore, your code should either examine the format before passing it to SetOutputProps, or handle the case of that method failing by attempting the next format enumerated from GetOutputFormat. For a code snippet showing how to identify a DirectX VA format, see Enabling DirectX Video Acceleration

If this method is called while the reader is running, an IWMReaderCallbackAdvanced::OnOutputPropsChanged call is generated.


Minimum supported client Windows 2000 Professional [desktop apps only],Windows Media Format 7 SDK, or later versions of the SDK
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header wmsdkidl.h (include Wmsdk.h)
Library Wmvcore.lib; WMStubDRM.lib (if you use DRM)

See also

IWMReader Interface