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# AVAssetReaderOutputMetadataAdaptor

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

```
class AVAssetReaderOutputMetadataAdaptor
```

## Topics

### Creating a metadata adaptor

[`+  assetReaderOutputMetadataAdaptorWithAssetReaderTrackOutput:`](/documentation/AVFoundation/AVAssetReaderOutputMetadataAdaptor/assetReaderOutputMetadataAdaptorWithAssetReaderTrackOutput:)

Returns a new object that reads timed metadata groups from an asset reader output.

[`-  initWithAssetReaderTrackOutput:`](/documentation/AVFoundation/AVAssetReaderOutputMetadataAdaptor/init(assetReaderTrackOutput:))

Creates an object that reads timed metadata groups from an asset reader output.

### Retrieving timed metadata groups

[`-  nextTimedMetadataGroup`](/documentation/AVFoundation/AVAssetReaderOutputMetadataAdaptor/nextTimedMetadataGroup())

Returns the next timed metadata group for the asset reader output.

### Inspecting the track output

[`assetReaderTrackOutput`](/documentation/AVFoundation/AVAssetReaderOutputMetadataAdaptor/assetReaderTrackOutput)

The asset reader track output that provides the timed metadata groups.

## Relationships

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

### Conforms To

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`CVarArg`](/documentation/Swift/CVarArg)

---

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