Number representing the zero-based index of the output device. The number and descriptions of available output devices can be obtained with a prior call to the GetOutputDevicesCount and GetOutputDeviceDesc
In case you should simply need sending the output of the stream mixer to a streaming server, without the need to hear what is being played, and you shouldn't need to record PCM in output from the stream mixer using the Active Sound Recorder control, the presence of an output device wouldn't be needed so you could set this parameter to -1.
In this specific case the playback stream is not created in "playback mode" but in another mode called "decode mode", in this situation, where the sound card driver is not involved, no synchronization is available between the decoder and what is being passed to the encoder: the encoder always requests to the player to pass as much data as possible so you will certainly observe the stream being "played" (but it would be better to say "consumed") at a higher speed: client PCs connected to the same network stream will obviously play at normal speed.
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