What does HRESULT 0x88980001 (MILERR_OBJECTBUSY) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Media Integration Layer object is busy and cannot perform the requested operation.

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WINML_ERR_SIZE_MISMATCH	MILERR_INSUFFICIENTBUFFER

MILERR_OBJECTBUSY

MILERR_OBJECTBUSY is a Windows Media Integration Layer (MIL) HRESULT. It indicates that the target rendering object is still in use by another operation or has not reached a state where the request is allowed.

What to check

Wait for the operation that owns the object to complete before changing or releasing it.
Check application synchronization around rendering resources shared across UI, composition, or worker threads.
Avoid retry loops that repeatedly submit the same operation while the object remains busy.

Microsoft documentation about WPF hardware-accelerated rendering

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