<!--
{
  "documentType" : "article",
  "framework" : "CoreVideo",
  "identifier" : "/documentation/CoreVideo/cvbuffer-attachment-keys",
  "metadataVersion" : "0.1.0",
  "role" : "collectionGroup",
  "title" : "CVBuffer Attachment Keys"
}
-->

# CVBuffer Attachment Keys

The attachment types for a Core Video buffer.

## Topics

### Constants

[`let kCVBufferMovieTimeKey: CFString`](/documentation/CoreVideo/kCVBufferMovieTimeKey)

The movie time associated with the buffer. Generally only available for frames emitted by QuickTime (type `CFDictionary` containing the [`kCVBufferTimeValueKey`](/documentation/CoreVideo/kCVBufferTimeValueKey) and [`kCVBufferTimeScaleKey`](/documentation/CoreVideo/kCVBufferTimeScaleKey) keys).

[`let kCVBufferTimeValueKey: CFString`](/documentation/CoreVideo/kCVBufferTimeValueKey)

The time value associated with the movie.

[`let kCVBufferTimeScaleKey: CFString`](/documentation/CoreVideo/kCVBufferTimeScaleKey)

The time scale associated with the movie.


---

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)