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# AVAssetWriterInputMetadataAdaptor

An object that appends timed metadata groups to an asset writer input.

```
class AVAssetWriterInputMetadataAdaptor
```

## Overview

Use a metadata adaptor to append track-level metadata, packaged as instances of [`AVTimedMetadataGroup`](/documentation/AVFoundation/AVTimedMetadataGroup), to an asset writer input.

## Topics

### Creating an input metadata adaptor

[`+  assetWriterInputMetadataAdaptorWithAssetWriterInput:`](/documentation/AVFoundation/AVAssetWriterInputMetadataAdaptor/assetWriterInputMetadataAdaptorWithAssetWriterInput:)

Returns a new metadata adaptor to append timed metadata groups to write to an output file.

[`-  initWithAssetWriterInput:`](/documentation/AVFoundation/AVAssetWriterInputMetadataAdaptor/init(assetWriterInput:))

Creates a metadata group adaptor to append timed metadata groups to write to an output file.

### Appending timed metadata

[`-  appendTimedMetadataGroup:`](/documentation/AVFoundation/AVAssetWriterInputMetadataAdaptor/append(_:))

Appends a timed metadata group to the adaptor.

### Accessing the input

[`assetWriterInput`](/documentation/AVFoundation/AVAssetWriterInputMetadataAdaptor/assetWriterInput)

The input for the metadata adaptor.

## Relationships

### Conforms To

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

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

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

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

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

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

### Inherits From

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

---

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