---
title: kCMMetadataKeySpace_QuickTimeUserData
framework: coremedia
role: symbol
role_heading: Global Variable
path: coremedia/kcmmetadatakeyspace_quicktimeuserdata
---

# kCMMetadataKeySpace_QuickTimeUserData

Metadata keyspace for QuickTime User Data keys.

## Declaration

```swift
let kCMMetadataKeySpace_QuickTimeUserData: CFString
```

## Discussion

Discussion This keyspace defines its key values to be expressed as OSTypes (a.k.a. FourCharCodes). As such, keys must be four bytes in length.

## See Also

### Constants

- [kCMMetadataKeySpace_ISOUserData](coremedia/kcmmetadatakeyspace_isouserdata.md)
- [kCMMetadataKeySpace_QuickTimeMetadata](coremedia/kcmmetadatakeyspace_quicktimemetadata.md)
- [kCMMetadataKeySpace_iTunes](coremedia/kcmmetadatakeyspace_itunes.md)
- [kCMMetadataKeySpace_ID3](coremedia/kcmmetadatakeyspace_id3.md)
- [kCMMetadataKeySpace_Icy](coremedia/kcmmetadatakeyspace_icy.md)
- [kCMMetadataKeySpace_HLSDateRange](coremedia/kcmmetadatakeyspace_hlsdaterange.md)