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# AVTimedMetadataGroup

A collection of metadata items that are valid for use during a specific time range.

```
class AVTimedMetadataGroup
```

## Overview

For example, `AVTimedMetadataGroups` are used to represent chapters, optionally containing metadata items for chapter titles and chapter images.

## Topics

### Creating a timed metadata group

[`init(sampleBuffer:)`](/documentation/AVFoundation/AVTimedMetadataGroup/init(sampleBuffer:)-6atlv)

Creates a timed metadata group with a sample buffer.

[`init(items:timeRange:)`](/documentation/AVFoundation/AVTimedMetadataGroup/init(items:timeRange:))

Creates a timed metadata group initialized with the given metadata items.

[`init(sampleBuffer:)`](/documentation/AVFoundation/AVTimedMetadataGroup/init(sampleBuffer:)-bjuo)   

### Accessing group attributes

[`items`](/documentation/AVFoundation/AVTimedMetadataGroup/items)

An array of metadata items in the timed metadata group.

[`timeRange`](/documentation/AVFoundation/AVTimedMetadataGroup/timeRange)

The time range for the timed metadata.

### Creating a format description

[`copyFormatDescription()`](/documentation/AVFoundation/AVTimedMetadataGroup/copyFormatDescription())

Creates a format description based on the receiver’s items.


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