<!--
{
  "availability" : [
    "iOS: 11.0.0 -",
    "iPadOS: 11.0.0 -",
    "macCatalyst: 14.0.0 -",
    "macOS: 10.15.0 -",
    "tvOS: 17.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFoundation",
  "identifier" : "/documentation/AVFoundation/AVCaptureOutput/DataDroppedReason",
  "metadataVersion" : "0.1.0",
  "role" : "Enumeration",
  "symbol" : {
    "kind" : "Enumeration",
    "modules" : [
      "AVFoundation"
    ],
    "preciseIdentifier" : "c:@E@AVCaptureOutputDataDroppedReason"
  },
  "title" : "AVCaptureOutput.DataDroppedReason"
}
-->

# AVCaptureOutput.DataDroppedReason

Constants that define reasons for why the system dropped a frame.

```
enum DataDroppedReason
```

## Topics

### Reasons

[`AVCaptureOutput.DataDroppedReason.none`](/documentation/AVFoundation/AVCaptureOutput/DataDroppedReason/none)

The system didn’t drop data.

[`AVCaptureOutput.DataDroppedReason.lateData`](/documentation/AVFoundation/AVCaptureOutput/DataDroppedReason/lateData)

The system dropped data because you’ve configured capture output to drop data when delegate queue is in a blocked state, and there’s data to deliver.

[`AVCaptureOutput.DataDroppedReason.outOfBuffers`](/documentation/AVFoundation/AVCaptureOutput/DataDroppedReason/outOfBuffers)

The system dropped data because the capture output exhausted its internal pool of memory buffers.

[`AVCaptureOutput.DataDroppedReason.discontinuity`](/documentation/AVFoundation/AVCaptureOutput/DataDroppedReason/discontinuity)

The system dropped data because the device providing data experienced a discontinuity, and the output lost an unknown number of data objects.


---

Copyright &copy; 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)