---
title: AVAssetReaderOutputMetadataAdaptor
framework: avfoundation
role: symbol
role_heading: Class
path: avfoundation/avassetreaderoutputmetadataadaptor
---

# AVAssetReaderOutputMetadataAdaptor

An object that creates timed metadata group objects for an asset track.

## Declaration

```swift
class AVAssetReaderOutputMetadataAdaptor
```

## Topics

### Creating a metadata adaptor

- [init(assetReaderTrackOutput:)](avfoundation/avassetreaderoutputmetadataadaptor/init(assetreadertrackoutput:).md)

### Retrieving timed metadata groups

- [nextTimedMetadataGroup()](avfoundation/avassetreaderoutputmetadataadaptor/nexttimedmetadatagroup().md)

### Inspecting the track output

- [assetReaderTrackOutput](avfoundation/avassetreaderoutputmetadataadaptor/assetreadertrackoutput.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

### Media reading

- [Reading multiview 3D video files](avfoundation/reading-multiview-3d-video-files.md)
- [AVAssetReader](avfoundation/avassetreader.md)
- [AVAssetReaderOutput](avfoundation/avassetreaderoutput.md)
- [AVAssetReaderTrackOutput](avfoundation/avassetreadertrackoutput.md)
- [AVAssetReaderAudioMixOutput](avfoundation/avassetreaderaudiomixoutput.md)
- [AVAssetReaderVideoCompositionOutput](avfoundation/avassetreadervideocompositionoutput.md)
- [AVAssetReaderSampleReferenceOutput](avfoundation/avassetreadersamplereferenceoutput.md)