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# automaticallyConfiguresOutputBufferDimensions

A Boolean value that indicates whether the output automatically configures the size of output buffers.

```
var automaticallyConfiguresOutputBufferDimensions: Bool { get set }
```

## Discussion

In most configurations, [`AVCaptureVideoDataOutput`](/documentation/AVFoundation/AVCaptureVideoDataOutput) delivers full-resolution buffers that match the video dimensions of the capture device’s [`activeFormat`](/documentation/AVFoundation/AVCaptureDevice/activeFormat) property. When this property is <doc://com.apple.documentation/documentation/Swift/true>, the output is free to scale the buffers delivered to [`captureOutput(_:didOutput:from:)`](/documentation/AVFoundation/AVCaptureVideoDataOutputSampleBufferDelegate/captureOutput(_:didOutput:from:)) to a size suitable for preview (approximately the size of the screen).

You can query this property to find out whether the automatic configuration of output buffer dimensions is downscaling buffers to a preview size. You can also query the output’s [`videoSettings`](/documentation/AVFoundation/AVCaptureVideoDataOutput/videoSettings) dictionary to find the buffer’s exact dimensions.

The default value of this property is <doc://com.apple.documentation/documentation/Swift/true>.

> Important:
> You must set this property to <doc://com.apple.documentation/documentation/Swift/false> before you can manually set ``doc://com.apple.avfoundation/documentation/AVFoundation/AVCaptureVideoDataOutput/deliversPreviewSizedOutputBuffers`` to <doc://com.apple.documentation/documentation/Swift/true>.

---

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