What does HRESULT 0xC00D1BD4 (NS_E_INVALID_FOLDDOWN_COEFFICIENTS) mean?

NS_E_INVALID_FOLDDOWN_COEFFICIENTS

NS_E_INVALID_FOLDDOWN_COEFFICIENTS: the failing boundary

NS_E_INVALID_FOLDDOWN_COEFFICIENTS (0xC00D1BD4) means The fold-down value needs to be between -144 and 0. The important boundary is audio fold-down coefficients; do not replace this result with a broader “Windows Media failed” diagnosis.

What this result proves

This code proves that a fold-down coefficient lies outside the permitted -144 to 0 range. 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 each channel coefficient and its units; correct only the out-of-range value and repeat profile validation. 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_FOLDDOWN_COEFFICIENTS.

Technical references

• Windows Media Format SDK.
• Microsoft HRESULT registry.