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# videoMinFrameDurationOverride

A time value that acts as a modifier to a capture device’s active video minimum frame duration.

```
var videoMinFrameDurationOverride: CMTime { get set }
```

## Discussion

A capture device’s [`activeVideoMinFrameDuration`](/documentation/AVFoundation/AVCaptureDevice/activeVideoMinFrameDuration) property is the reciprocal of its active maximum frame rate. To limit the maximum frame rate of the capture device, you may set [`activeVideoMinFrameDuration`](/documentation/AVFoundation/AVCaptureDevice/activeVideoMinFrameDuration) to a value supported by the device’s [`activeFormat`](/documentation/AVFoundation/AVCaptureDevice/activeFormat). Changes you make to the device’s [`activeVideoMinFrameDuration`](/documentation/AVFoundation/AVCaptureDevice/activeVideoMinFrameDuration) value take effect immediately without disrupting preview. Therefore, [`AVCaptureSession`](/documentation/AVFoundation/AVCaptureSession) must always allocate sufficient resources to allow the device to run at its active format’s maximum frame rate.

If you wish to use a particular device format but run it only at lower frame rates (for instance, only run a 1080p240 fps format at a maximum frame rate of 60), set the input’s [`videoMinFrameDurationOverride`](/documentation/AVFoundation/AVCaptureDeviceInput/videoMinFrameDurationOverride) property to the reciprocal of the maximum frame rate you intend to use before starting the session (or within a [`beginConfiguration()`](/documentation/AVFoundation/AVCaptureSession/beginConfiguration()) / [`commitConfiguration()`](/documentation/AVFoundation/AVCaptureSession/commitConfiguration()) block while running the session).

This property’s default value is <doc://com.apple.documentation/documentation/CoreMedia/CMTime/invalid>. When you remove a device input from a session and then add it back, this property reverts to its default value.

---

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