---
title: unfollowExternalSyncDevice()
framework: avfoundation
role: symbol
role_heading: Instance Method
path: avfoundation/avcapturedeviceinput/unfollowexternalsyncdevice()
---

# unfollowExternalSyncDevice()

Discontinues external sync.

## Declaration

```swift
func unfollowExternalSyncDevice()
```

## Discussion

Discussion This method stops your input from syncing to the external sync device you specified in follow(_:videoFrameDuration:delegate:).

## See Also

### Synchronizing with external devices

- [isExternalSyncSupported](avfoundation/avcapturedeviceinput/isexternalsyncsupported.md)
- [follow(_:videoFrameDuration:delegate:)](avfoundation/avcapturedeviceinput/follow(_:videoframeduration:delegate:).md)
- [activeExternalSyncVideoFrameDuration](avfoundation/avcapturedeviceinput/activeexternalsyncvideoframeduration.md)
- [externalSyncDevice](avfoundation/avcapturedeviceinput/externalsyncdevice.md)