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# minFrameDuration

The minimum duration of the track’s frames.

```
static var minFrameDuration: AVAsyncProperty<Root, CMTime> { get }
```

## Discussion

Use the [`load(_:isolation:)`](/documentation/AVFoundation/AVAsynchronousKeyValueLoading/load(_:isolation:)) method to retrieve the property value.

A track’s minimum frame duration is the reciprocal of its maximum frame rate. For example, a video track with a maximum frame rate of 30 frames per second has a minimum frame duration of 1/30, or 0.033 seconds.

The value of this property is <doc://com.apple.documentation/documentation/CoreMedia/CMTime/invalid> if the track can’t calculate its minimum frame duration, or if it’s unknown.

---

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