IWMSyncReader::SetOutputProps method

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


HRESULT SetOutputProps(
  DWORD               dwOutputNum,
  IWMOutputMediaProps *pOutput



DWORD containing the output number.


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 or equal to the number of outputs. Output numbers begin with zero.
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 else handle the case of that method failing by attempting the next format enumerated from GetOutputFormat.. For example code showing how to identify a DirectX VA format, see Enabling DirectX Video Acceleration.

You can call SetOutputProps at any time after a file has been loaded into the synchronous reader. You can continue making calls as needed during playback.

New output properties set with this method will take effect with the next call to GetNextSample.


Minimum supported client Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series 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

IWMOutputMediaProps Interface

IWMSyncReader Interface