# automaticallyEnablesLowLightVideoNoiseReduction Indicates whether the connection should automatically enable low light video noise reduction when the connection supports it. ``` var automaticallyEnablesLowLightVideoNoiseReduction: Bool { get set } ``` ## Discussion On a connection where [`isLowLightVideoNoiseReductionSupported`](/documentation/AVFoundation/AVCaptureConnection/isLowLightVideoNoiseReductionSupported) is `true`, the system can enable low light video noise reduction to improve video quality at the cost of additional power. This property defaults to `true` for movie file output connections. When [`automaticallyEnablesLowLightVideoNoiseReduction`](/documentation/AVFoundation/AVCaptureConnection/automaticallyEnablesLowLightVideoNoiseReduction) is `true`, the connection sets [`isLowLightVideoNoiseReductionEnabled`](/documentation/AVFoundation/AVCaptureConnection/isLowLightVideoNoiseReductionEnabled) to `true` automatically when the session configuration is committed and the connection supports the feature. For `AVCaptureMultiCamSession` configurations with multiple movie file outputs, automatic enablement is suppressed because the feature can only be active on one output at a time; in that case, set this property to `false` and control [`isLowLightVideoNoiseReductionEnabled`](/documentation/AVFoundation/AVCaptureConnection/isLowLightVideoNoiseReductionEnabled) directly on the desired connection. Enabling the feature on more than one movie file output connection increases the session’s `hardwareCost` and may result in an `AVCaptureSessionRuntimeErrorNotification`. Setting this property on a connection that does not support low light video noise reduction is permitted but has no effect. Clients can key-value observe [`isLowLightVideoNoiseReductionEnabled`](/documentation/AVFoundation/AVCaptureConnection/isLowLightVideoNoiseReductionEnabled) to know when the connection has automatically changed the value. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)