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NS_E_NO_REALTIME_PREPROCESS
NS_E_NO_REALTIME_PREPROCESS: the failing boundary
NS_E_NO_REALTIME_PREPROCESS (0xC00D1B8C) means It is not possible to use image preprocessing with live encoding. The important boundary is live preprocessing capability; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that image preprocessing cannot be enabled for live encoding. 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
Verify that the source is live, record requested preprocessing filters, and retest with preprocessing disabled while leaving profile and source unchanged. 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_NO_REALTIME_PREPROCESS.
Technical references
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