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# signalCompensationDelay

Delay to wait before starting the frame capture.

```
var signalCompensationDelay: CMTime { get set }
```

## Discussion

An external sync is generally used to configure multiple devices in the real world. A display and a camera may receive a signal at the same time, but that does not mean the refresh of the display and camera are aligned in a way that does not cause tearing in the recording. The signal compensation delay can be used to offset the readout of a camera on an intra-frame scale.

Setting this property throws an NSInvalidArgumentException if called when [`isSignalCompensationDelaySupported`](/documentation/AVFoundation/AVExternalSyncDevice/isSignalCompensationDelaySupported) returns NO.

> Important: You should always set this property to a value less than the frame duration at which the camera is operating.

---

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