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NS_E_INVALID_VBR_WITH_UNCOMP
NS_E_INVALID_VBR_WITH_UNCOMP: the failing boundary
NS_E_INVALID_VBR_WITH_UNCOMP (0xC00D1BB4) means It is not possible to use a VBR encoding mode with uncompressed audio or video. The important boundary is VBR/profile compatibility; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that variable-bit-rate mode was requested for an uncompressed audio or video stream. 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 compression mode and stream subtype; disable vbr or select a compressed codec for that stream. 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_INVALID_VBR_WITH_UNCOMP.
Technical references
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