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NS_E_NOMATCHING_ELEMENT
NS_E_NOMATCHING_ELEMENT: the failing boundary
NS_E_NOMATCHING_ELEMENT (0xC00D1B5E) means No matching element is found in the list. The important boundary is encoder list lookup; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that the requested element was not present in the list being searched. 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 list identity, lookup key/index and current list contents; verify the element is actually present before changing media or device settings. 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_NOMATCHING_ELEMENT.
Technical references
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