---
title: minFrameDuration
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcompositiontrack/minframeduration
---

# minFrameDuration

The minimum duration of the track’s frames.

## Declaration

```swift
var minFrameDuration: CMTime { get }
```

## Discussion

Discussion 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 invalid if the track can’t calculate its minimum frame duration, or if it’s unknown.

## See Also

### Accessing frame-based characteristics

- [nominalFrameRate](avfoundation/avcompositiontrack/nominalframerate.md)
- [requiresFrameReordering](avfoundation/avcompositiontrack/requiresframereordering.md)