DRM_E_UNKNOWN_PROPERTY

Code: 0x8004C05E (2147795038)

As HRESULT:

S: 1 (Failure)
C: 0 (Microsoft-defined)
N: 0 (Not an NTSTATUS value)
Facility: 0x004 (FACILITY_ITF: COM/OLE Interface management)
Code: 0xc05e (49246)

As NTSTATUS:

Sev: 2 (STATUS_SEVERITY_WARNING)
C: 0 (Microsoft-defined)
Facility: 0x004 (FACILITY_IO_ERROR_CODE: Input/Output)
Code: 0xc05e (49246)

Documented in Win32

Error Codes (Windows Media Device Manager 11 SDK): 0x8004C05E

A device property is unknown.