IWMReaderTypeNegotiation interface (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 It has been superseded by Source Reader and Sink Writer.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 IWMReaderTypeNegotiation interface provides a single method that can be used to test certain changes to the output properties of a stream.

An IWMReaderTypeNegotiation interface exists for every reader object. You can obtain a pointer to an instance of this interface by calling the QueryInterface method of any other interface of the reader object.


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


The IWMReaderTypeNegotiation interface has these methods.


The TryOutputProps method ascertains whether certain changes to the properties of an output are possible.


Target Platform Windows
Header wmsdkidl.h

See also

IWMReader Interface


Reader Object