---
title: CMPersistentTrackID
framework: coremedia
role: symbol
role_heading: Type Alias
path: coremedia/cmpersistenttrackid
---

# CMPersistentTrackID

A datatype that represents a persistent track identifier.

## Declaration

```swift
typealias CMPersistentTrackID = Int32
```

## See Also

### Data Types

- [CMSampleBuffer](coremedia/cmsamplebuffer.md)
- [Sample Buffer Flags](coremedia/sample-buffer-flags.md)
- [CMSampleTimingInfo](coremedia/cmsampletiminginfo.md)
- [CMBuffer](coremedia/cmbuffer.md)
- [CMBufferGetSizeCallback](coremedia/cmbuffergetsizecallback.md)
- [CMItemIndex](coremedia/cmitemindex.md)
- [CMItemCount](coremedia/cmitemcount.md)
- [CMMuxedStreamType](coremedia/cmmuxedstreamtype.md)