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NS_E_VIDCAPDRVINUSE
NS_E_VIDCAPDRVINUSE: the failing boundary
NS_E_VIDCAPDRVINUSE (0xC00D1B6E) means There is already a stream active on this video device. The important boundary is video capture streaming state; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that a stream is already active on the selected video device. 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 device moniker, active graph/stream owner and requested pin; stop the existing stream before creating another on that device. 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_VIDCAPDRVINUSE.
Technical references
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