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NS_E_VIDEODEVICE_UNEXPECTED
NS_E_VIDEODEVICE_UNEXPECTED: the failing boundary
NS_E_VIDEODEVICE_UNEXPECTED (0xC00D1B65) means It is not possible to open the specified video capture device because an unexpected error has occurred. The important boundary is video capture initialization; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that the selected video device returned an unclassified failure while being opened. 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, driver version, requested media type, competing graphs, and the first driver/directshow result; test one native format in a fresh graph. 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_VIDEODEVICE_UNEXPECTED.
Technical references
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