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NS_E_UNSUPPORTED_SOURCETYPE
NS_E_UNSUPPORTED_SOURCETYPE: the failing boundary
NS_E_UNSUPPORTED_SOURCETYPE (0xC00D1B5B) means The specified source type is not supported. The important boundary is source plug-in selection; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that the configured source type is not supported by the encoder/source subsystem. 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 uri/device type and source plug-in selected; use a supported source type or install the component that handles that type. 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_UNSUPPORTED_SOURCETYPE.
Technical references
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