<!--
{
  "availability" : [
    "iOS: 18.0.0 - 27.0.0",
    "iPadOS: 18.0.0 - 27.0.0",
    "macCatalyst: 15.0.0 - 27.0.0",
    "macOS: 12.0.0 - 27.0.0"
  ],
  "documentType" : "symbol",
  "framework" : "AVFoundation",
  "identifier" : "/documentation/AVFoundation/AVAssetWriterInputCaptionAdaptor/append(_:)-4ils8",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "AVFoundation"
    ],
    "preciseIdentifier" : "c:objc(cs)AVAssetWriterInputCaptionAdaptor(im)appendCaptionGroup:"
  },
  "title" : "append(_:)"
}
-->

# append(_:)

Appends a caption group that the system writes to the output.

```
func append(_ captionGroup: AVCaptionGroup) -> Bool
```

## Parameters

`captionGroup`

The caption group that the system writes to the output.

## Return Value

A Boolean value that indicates whether the operation succeeded.

---

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)