---
title: AVErrorPersistentTrackIDKey
framework: AVFoundation
role: symbol
role_heading: Global Variable
platforms: [iOS 8.0+, iPadOS 8.0+, Mac Catalyst 13.1+, macOS 10.10+, tvOS 9.0+, visionOS 1.0+, watchOS 1.0+]
path: avfoundation/averrorpersistenttrackidkey
---

# AVErrorPersistentTrackIDKey

The user information key to retrieve the track’s persistent identifier.

## Declaration

```swift
let AVErrorPersistentTrackIDKey: String
```

## Discussion

Discussion The associated value is of type CMPersistentTrackID.

## See Also

### User info keys

- [AVErrorDeviceKey](avfoundation/averrordevicekey.md)
- [AVErrorDiscontinuityFlagsKey](avfoundation/averrordiscontinuityflagskey.md)
- [AVErrorFileSizeKey](avfoundation/averrorfilesizekey.md)
- [AVErrorFileTypeKey](avfoundation/averrorfiletypekey.md)
- [AVErrorMediaTypeKey](avfoundation/averrormediatypekey.md)
- [AVErrorMediaSubTypeKey](avfoundation/averrormediasubtypekey.md)
- [AVErrorPIDKey](avfoundation/averrorpidkey.md)
- [AVErrorPresentationTimeStampKey](avfoundation/averrorpresentationtimestampkey.md)
- [AVErrorRecordingSuccessfullyFinishedKey](avfoundation/averrorrecordingsuccessfullyfinishedkey.md)
- [AVErrorTimeKey](avfoundation/averrortimekey.md)