If the answer is the right solution, please click "Accept Answer" and kindly upvote it. You can submit a request to the Github to remove the incorrect comments. The audio format hard coded in the sample code, this is the CD quality audio format (2 channel, 16 bit, 44100 Hz) which is the most popular format used in WAV audio, so it is safe to use this hard coded format. This is the reason why you get E_NOTIMPL on COM calls. Internally the m_AudioClient interface points to the AudioSes!CMixerClient class but unfortunately the GetMixFormat() and IsFormatSupported() methods are not supported in the class. The audio sample demonstrates the scenario for process-based loopback capture, and this is actually not tied to a specific audio endpoint.
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