---
title: trackID
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avassettrack/trackid
---

# trackID

The persistent unique identifier for this track.

## Declaration

```swift
var trackID: CMPersistentTrackID { get }
```

## See Also

### Identifying an asset track

- [mediaType](avfoundation/avassettrack/mediatype.md)
- [asset](avfoundation/avassettrack/asset.md)