<!--
{
  "availability" : [
    "iOS: 4.0.0 -",
    "iPadOS: 4.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.7.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 6.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreMedia",
  "identifier" : "/documentation/CoreMedia/CMClosedCaptionFormatType",
  "metadataVersion" : "0.1.0",
  "role" : "Type Alias",
  "symbol" : {
    "kind" : "Type Alias",
    "modules" : [
      "Core Media"
    ],
    "preciseIdentifier" : "c:@T@CMClosedCaptionFormatType"
  },
  "title" : "CMClosedCaptionFormatType"
}
-->

# CMClosedCaptionFormatType

A closed caption format type.

```
typealias CMClosedCaptionFormatType = FourCharCode
```

## Topics

### Constants

[`kCMClosedCaptionFormatType_CEA608`](/documentation/CoreMedia/kCMClosedCaptionFormatType_CEA608)

A type that describes CEA 608-compliant samples.

[`kCMClosedCaptionFormatType_CEA708`](/documentation/CoreMedia/kCMClosedCaptionFormatType_CEA708)

A type that describes CEA 708-compliant samples.


---

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)