To Find Stream Numbers and Output Numbers
[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 It has been superseded by Source Reader and Sink Writer.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 synchronous reader supports more simplified switching between stream and output numbers for playback than the asynchronous reader. It is therefore more important to be able to find which stream numbers equate to which output numbers, or the other way around.
To find the output number that corresponds to a stream number, call IWMSyncReader::GetOutputNumberForStream.
To find the stream number that corresponds to an output number, call IWMSyncReader::GetStreamNumberForOutput
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