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NS_E_TOO_MANY_AUDIO
NS_E_TOO_MANY_AUDIO: the failing boundary
NS_E_TOO_MANY_AUDIO (0xC00D1B5C) means It is not possible to specify more than one audio input. The important boundary is audio input topology; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that the session specifies more than the single audio input supported by this configuration. It does not, by itself, prove a codec, permissions, network, device, or media problem outside that boundary. Preserve the first lower-level result when one exists, because later Player or Encoder errors can hide the original cause.
Evidence and focused verification
Record source-group audio inputs and their roles; reduce the session to one audio input and revalidate. Keep the media object, endpoint, profile, or device identity fixed while changing only that rejected precondition. A successful retest should pass this exact boundary; a different HRESULT from a later stage is new evidence, not recurrence of NS_E_TOO_MANY_AUDIO.
Technical references
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