# depthDataOutput(_:didDrop:timestamp:connection:reason:) Informs the delegate that captured depth data was not processed. ``` optional func depthDataOutput(_ output: AVCaptureDepthDataOutput, didDrop depthData: AVDepthData, timestamp: CMTime, connection: AVCaptureConnection, reason: AVCaptureOutput.DataDroppedReason) ``` ## Parameters `output` The depth data output providing data. `depthData` A depth data object containing information about the dropped data, such as its data type. Because this depth data was not captured or processed, its [`depthDataMap`](/documentation/AVFoundation/AVDepthData/depthDataMap) property is empty. `timestamp` The time at which the data was captured. `connection` The capture connection through which the data was captured. `reason` The reason depth data was dropped. ## Discussion The capture output calls this method once for each incident of dropped depth data. The object in the `depthData` parameter is an empty shell, and doesn’t contain a depth data backing pixel buffer. The capture output calls this method on the dispatch queue specified by its [`delegateCallbackQueue`](/documentation/AVFoundation/AVCaptureDepthDataOutput/delegateCallbackQueue) property. Because this method executes on the same dispatch queue that outputs depth data, your implementation must be efficient to prevent further capture performance problems such as additional drops. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)