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# AVFrameRateRange

An immutable type that represents a range of valid frame rates.

```
class AVFrameRateRange
```

## Overview

An AVFrameRateRange object is immutable.

An [`AVCaptureDevice.Format`](/documentation/AVFoundation/AVCaptureDevice/Format) object wraps a CMFormatDescription and expresses a range of valid video frame rates as an array of `AVFrameRateRange` objects.

An [`AVCaptureDevice`](/documentation/AVFoundation/AVCaptureDevice) object uses `AVCaptureDeviceFormat` to describe the formats it supports and the currently-active format.

## Topics

### Accessing properties

[`maxFrameDuration`](/documentation/AVFoundation/AVFrameRateRange/maxFrameDuration)

The maximum frame duration supported by the range.

[`maxFrameRate`](/documentation/AVFoundation/AVFrameRateRange/maxFrameRate)

The maximum frame rate supported by the range.

[`minFrameDuration`](/documentation/AVFoundation/AVFrameRateRange/minFrameDuration)

The minimum frame duration supported by the range.

[`minFrameRate`](/documentation/AVFoundation/AVFrameRateRange/minFrameRate)

The minimum frame rate supported by the range.


---

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