# fileOutput(_:willFinishRecordingTo:from:error:) Informs the delegate when the output will stop writing new samples to a file. ``` optional func fileOutput(_ output: AVCaptureFileOutput, willFinishRecordingTo fileURL: URL, from connections: [AVCaptureConnection], error: (any Error)?) ``` ## Parameters `output` The capture file output that will finish writing the file. `fileURL` The file URL of the file that is being written. `connections` An array of [`AVCaptureConnection`](/documentation/AVFoundation/AVCaptureConnection) objects attached to the file output that provided the data that is being written to the file. `error` An error describing what caused the file to stop recording, or `nil` if there was no error. ## Discussion This method is called when the file output will stop recording new samples to the file at [`outputFileURL`](/documentation/AVFoundation/AVCaptureFileOutput/outputFileURL), either because [`startRecording(to:recordingDelegate:)`](/documentation/AVFoundation/AVCaptureFileOutput/startRecording(to:recordingDelegate:)) or [`stopRecording()`](/documentation/AVFoundation/AVCaptureFileOutput/stopRecording()) was called, or because an error (described by the error parameter) occurred (if no error occurred, the error parameter is `nil`). This method is always called for each recording request, even if no data is successfully written to the file. You should not assume that this method will be called on a specific thread, and should make this method as efficient as possible. --- 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)