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# beginConfiguration()

Marks the beginning of changes to a running capture session’s configuration to perform in a single atomic update.

```
func beginConfiguration()
```

## Discussion

Call this method and [`commitConfiguration()`](/documentation/AVFoundation/AVCaptureSession/commitConfiguration()) to batch multiple configuration operations on a running session into an atomic update.

After you call this method, you can add or remove outputs, alter the [`sessionPreset`](/documentation/AVFoundation/AVCaptureSession/sessionPreset), or configure individual capture input or output properties. The session configuration doesn’t change until you invoke [`commitConfiguration()`](/documentation/AVFoundation/AVCaptureSession/commitConfiguration()), at which the system updates all settings. You can nest [`beginConfiguration()`](/documentation/AVFoundation/AVCaptureSession/beginConfiguration()) and [`commitConfiguration()`](/documentation/AVFoundation/AVCaptureSession/commitConfiguration()) pairs, and the system applies the changes when you call the outermost commit.

---

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