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# isAutoVideoFrameRateEnabled

A Boolean value that indicates whether the capture device performs automatic video frame rate adjustments.

```
var isAutoVideoFrameRateEnabled: Bool { get set }
```

## Discussion

You can enable this property on a device when its active format’s [`isAutoVideoFrameRateSupported`](/documentation/AVFoundation/AVCaptureDevice/Format/isAutoVideoFrameRateSupported) property is <doc://com.apple.documentation/documentation/Swift/true>. When enabled, a capture device automatically adjusts the active frame rate based on light level. Under low light conditions, it decreases the frame rate to properly expose the scene. For formats with a maximum frame rate of 30 fps, the frame rate switches between 30-24. For formats with a maximum frame rate of 60 fps, the frame rate switches between 60-30-24.

> Important:
> After enabling automatic frame rate adjustments, attempting to set a device’s ``doc://com.apple.avfoundation/documentation/AVFoundation/AVCaptureDevice/activeVideoMinFrameDuration`` or ``doc://com.apple.avfoundation/documentation/AVFoundation/AVCaptureDevice/activeVideoMaxFrameDuration`` throws an exception.

Changing the device’s active format resets this property to its default value of <doc://com.apple.documentation/documentation/Swift/false>.

---

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