What does HRESULT 0xC00D6D66 (MF_E_TRANSFORM_PROPERTY_PID_NOT_RECOGNIZED) mean?

MF_E_TRANSFORM_PROPERTY_PID_NOT_RECOGNIZED

MF_E_TRANSFORM_PROPERTY_PID_NOT_RECOGNIZED points to the property key supplied to a transform or codec configuration path. In the ICodecAPI model, codec properties are identified by GUIDs and their values are carried in VARIANT objects.

Validate the key before debugging its value

• Log the full property GUID, transform CLSID, and codec version or hardware implementation.
• Call ICodecAPI::IsSupported when the interface is available before attempting SetValue.
• Do not assume two encoders that accept the same media subtype expose the same private or optional codec properties.

This error is earlier than range or type validation: the property identifier itself does not match a property supported by the transform. Re-encoding the numeric value, changing VARIANT.vt, or increasing an array buffer cannot make an unknown key valid.

Microsoft: ICodecAPI · Microsoft: Media Foundation properties · Wine: transform property HRESULTs

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