---
title: minSupportedLockedVideoFrameDuration
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturedevice/minsupportedlockedvideoframeduration
---

# minSupportedLockedVideoFrameDuration

The maximum frame rate (expressed as a minimum duration) that can be set on an input associated with this device.

## Declaration

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

## Discussion

Discussion kCMTimeInvalid is returned when the device or its current configuration does not support locked frame rate. Use activeLockedVideoFrameDuration to set the locked frame rate on the input.

## See Also

### Synchronizing with external devices

- [isFollowingExternalSyncDevice](avfoundation/avcapturedevice/isfollowingexternalsyncdevice.md)
- [minSupportedExternalSyncFrameDuration](avfoundation/avcapturedevice/minsupportedexternalsyncframeduration.md)
- [isVideoFrameDurationLocked](avfoundation/avcapturedevice/isvideoframedurationlocked.md)