---
title: MLMediaObjectDurationKey
framework: medialibrary
role: symbol
role_heading: Global Variable
path: medialibrary/mlmediaobjectdurationkey
---

# MLMediaObjectDurationKey

Specifies the media object’s duration, in seconds. The value for this key is a number (NSNumber).

## Declaration

```swift
let MLMediaObjectDurationKey: String
```

## See Also

### Constants

- [MLMediaObjectArtistKey](medialibrary/mlmediaobjectartistkey.md)
- [MLMediaObjectAlbumKey](medialibrary/mlmediaobjectalbumkey.md)
- [MLMediaObjectGenreKey](medialibrary/mlmediaobjectgenrekey.md)
- [MLMediaObjectKindKey](medialibrary/mlmediaobjectkindkey.md)
- [MLMediaObjectTrackNumberKey](medialibrary/mlmediaobjecttracknumberkey.md)
- [MLMediaObjectBitRateKey](medialibrary/mlmediaobjectbitratekey.md)
- [MLMediaObjectSampleRateKey](medialibrary/mlmediaobjectsampleratekey.md)
- [MLMediaObjectChannelCountKey](medialibrary/mlmediaobjectchannelcountkey.md)
- [MLMediaObjectResolutionStringKey](medialibrary/mlmediaobjectresolutionstringkey.md)
- [MLMediaObjectCommentsKey](medialibrary/mlmediaobjectcommentskey.md)
- [MLMediaObjectKeywordsKey](medialibrary/mlmediaobjectkeywordskey.md)
- [MLMediaObjectProtectedKey](medialibrary/mlmediaobjectprotectedkey.md)