What does HRESULT 0x88980085 (MILERR_INVALIDCALL) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Media Integration Layer method was called in an invalid way.

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MILERR_DISPLAYFORMATNOTSUPPORTED	MILERR_ALREADYLOCKED

MILERR_INVALIDCALL

MILERR_INVALIDCALL is a Windows Media Integration Layer (MIL) HRESULT. It indicates that the request is not allowed for the current object state, parameter combination, or rendering lifecycle stage.

What to check

Verify the documented call order and state requirements for the resource or visual being used.
Check that the object has been initialized and has not already been released or finalized.
Remove optional flags and parameters until the failing call can be reproduced with a minimal valid request.

Microsoft documentation about WPF hardware-accelerated rendering

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