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# AVCaptureFileOutputDelegate

Methods for monitoring or controlling the output of a media file capture.

```
protocol AVCaptureFileOutputDelegate : NSObjectProtocol
```

## Overview

The `AVCaptureFileOutputDelegate` protocol defines an interface for delegates of an [`AVCaptureFileOutput`](/documentation/AVFoundation/AVCaptureFileOutput) object to monitor and control recordings along exact sample boundaries.

## Topics

### Sample processing

[`fileOutputShouldProvideSampleAccurateRecordingStart(_:)`](/documentation/AVFoundation/AVCaptureFileOutputDelegate/fileOutputShouldProvideSampleAccurateRecordingStart(_:))

Allows a client to opt in to frame accurate recording in [`fileOutput(_:didOutputSampleBuffer:from:)`](/documentation/AVFoundation/AVCaptureFileOutputDelegate/fileOutput(_:didOutputSampleBuffer:from:)).

[`fileOutput(_:didOutputSampleBuffer:from:)`](/documentation/AVFoundation/AVCaptureFileOutputDelegate/fileOutput(_:didOutputSampleBuffer:from:))

Gives the delegate the opportunity to inspect samples as they are received by the output and start and stop recording at exact times.


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