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Question: Selecting Video File Results in Alert

Every time I select a Handbrake video prepared for iTunes, I get the following alert: Use of the requested Audio Unit(s) require lowering the security settings for "QuickLookUIService". But after I cancel the alert and import the video into iTunes, it plays with no problem.

How can I turn off those alerts.

iMac (Retina 5K, 27-inch, 2017), macOS High Sierra (10.13.2)

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Question: Selecting Video File Results in Alert