<!--
{
  "availability" : [
    "iOS: 27.0.0 -",
    "iPadOS: 27.0.0 -",
    "macCatalyst: -",
    "macOS: 27.0.0 -",
    "tvOS: 27.0.0 -",
    "visionOS: 27.0.0 -",
    "watchOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreMedia",
  "identifier" : "/documentation/CoreMedia/CMSampleBufferAttachmentKeyDefinitions/droppedFrameReasonInfo",
  "metadataVersion" : "0.1.0",
  "role" : "Type Property",
  "symbol" : {
    "kind" : "Type Property",
    "modules" : [
      "Core Media"
    ],
    "preciseIdentifier" : "s:9CoreMedia38CMSampleBufferAttachmentKeyDefinitionsO22droppedFrameReasonInfo0A5Video012CVAttachmentF10DefinitionVyAE0M29ModePreferenceShouldPropagateOAA09CMDroppediJ0O0K0OGvpZ"
  },
  "title" : "droppedFrameReasonInfo"
}
-->

# droppedFrameReasonInfo

Indicates additional information regarding the dropped video frame.

```
static let droppedFrameReasonInfo: CVAttachmentKeyDefinition<CMSampleBufferAttachmentKeyDefinitions.ShouldPropagate, CMDroppedFrameReason.Info>
```

## Discussion

Sample buffers with this attachment contain no image or data buffer. They mark a dropped video frame. If
present, this attachment provides additional information about the reason described by the
[`droppedFrameReason`](/documentation/CoreMedia/CMSampleBufferAttachmentKeyDefinitions/droppedFrameReason) key.

---

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)