---
title: sourceSampleDataTrackIDs
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avvideocomposition/sourcesampledatatrackids-2hgue
---

# sourceSampleDataTrackIDs

The identifiers of source sample data tracks in the composition that the object requires to compose frames.

## Declaration

```swift
@objc(_sourceSampleDataTrackIDs) dynamic var sourceSampleDataTrackIDs: [CMPersistentTrackID] { get }
```

## See Also

### Identifying source tracks

- [sourceTrackIDForFrameTiming](avfoundation/avvideocomposition/sourcetrackidforframetiming.md)