---
title: synchronizationClock
framework: screencapturekit
role: symbol
role_heading: Instance Property
path: screencapturekit/scstream/synchronizationclock
---

# synchronizationClock

A clock to use for output synchronization.

## Declaration

```swift
var synchronizationClock: CMClock? { get }
```

## Discussion

Discussion The synchronization clock provides the timebase for sample buffers that the stream outputs. Use it to synchronize with the clocks of other media sources, such as the synchronizationClock of AVCaptureSession.