---
title: extendedLanguageTag
framework: MediaExtension
role: symbol
role_heading: Instance Property
platforms: [macOS 14.0+]
path: mediaextension/metrackinfo/extendedlanguagetag
---

# extendedLanguageTag

A string that indicates the language tag associated with the track, as an IETF BCP 47 (RFC 4646) language identifier.

## Declaration

```swift
var extendedLanguageTag: String? { get set }
```

## Discussion

Discussion MediaToolbox uses this property to group similar language tracks together or to match audio and caption tracks. Set this value to nil if the track doesn’t have a language tag.

## See Also

### Inspecting track information

- [mediaType](mediaextension/metrackinfo/mediatype.md)
- [trackID](mediaextension/metrackinfo/trackid.md)
- [isEnabled](mediaextension/metrackinfo/isenabled.md)
- [naturalTimescale](mediaextension/metrackinfo/naturaltimescale.md)
- [naturalSize](mediaextension/metrackinfo/naturalsize.md)
- [preferredTransform](mediaextension/metrackinfo/preferredtransform.md)
- [nominalFrameRate](mediaextension/metrackinfo/nominalframerate.md)
- [requiresFrameReordering](mediaextension/metrackinfo/requiresframereordering.md)