---
title: key
framework: mediaplayer
role: symbol
role_heading: Instance Property
path: mediaplayer/mptimedmetadata/key
---

# key

A key that identifies a piece of timed metadata.

## Declaration

```swift
var key: String! { get }
```

## See Also

### Extracting timed metadata from a stream

- [allMetadata](mediaplayer/mptimedmetadata/allmetadata.md)
- [keyspace](mediaplayer/mptimedmetadata/keyspace.md)
- [timestamp](mediaplayer/mptimedmetadata/timestamp.md)
- [value](mediaplayer/mptimedmetadata/value.md)