---
title: AVAssetWriterInputCaptionAdaptor
framework: avfoundation
role: symbol
role_heading: Class
path: avfoundation/avassetwriterinputcaptionadaptor
---

# AVAssetWriterInputCaptionAdaptor

An object that appends captions to an asset writer input.

## Declaration

```swift
class AVAssetWriterInputCaptionAdaptor
```

## Topics

### Creating a caption adaptor

- [init(assetWriterInput:)](avfoundation/avassetwriterinputcaptionadaptor/init(assetwriterinput:).md)

### Accessing the writer input

- [assetWriterInput](avfoundation/avassetwriterinputcaptionadaptor/assetwriterinput.md)

### Appending captions

- [append(_:)](avfoundation/avassetwriterinputcaptionadaptor/append(_:)-910lp.md)
- [append(_:)](avfoundation/avassetwriterinputcaptionadaptor/append(_:)-4ils8.md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Reading and writing

- [AVAssetReaderOutputCaptionAdaptor](avfoundation/avassetreaderoutputcaptionadaptor.md)