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MILERR_INTERNALERROR
MILERR_INTERNALERROR is a Windows Media Integration Layer (MIL) HRESULT. It indicates that MIL reached an internal failure that it could not classify as a more specific graphics or caller error.
What to check
- Record the complete HRESULT, call sequence, graphics driver version, and any preceding MIL errors.
- Retry only after recreating affected rendering resources or confirming that the graphics device is healthy.
- Install applicable Windows and display-driver updates when the failure is reproducible with simple content.
Microsoft documentation about WPF hardware-accelerated rendering
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