---
title: sourceSampleDataTrackIDs
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avasynchronousvideocompositionrequest/sourcesampledatatrackids-3yiab
---

# sourceSampleDataTrackIDs

The identifiers of tracks that contain source sample data.

## Declaration

```swift
@nonobjc var sourceSampleDataTrackIDs: [CMPersistentTrackID] { get }
```

## Discussion

Discussion Sample data tracks have a media type of kCMMediaType_Metadata.

## See Also

### Accessing source data

- [attach(_:to:)](avfoundation/avasynchronousvideocompositionrequest/attach(_:to:).md)
- [sourceFrame(byTrackID:)](avfoundation/avasynchronousvideocompositionrequest/sourceframe(bytrackid:).md)
- [sourceReadOnlyPixelBuffer(byTrackID:)](avfoundation/avasynchronousvideocompositionrequest/sourcereadonlypixelbuffer(bytrackid:).md)
- [sourceReadySampleBuffer(byTrackID:)](avfoundation/avasynchronousvideocompositionrequest/sourcereadysamplebuffer(bytrackid:).md)
- [sourceSampleBuffer(byTrackID:)](avfoundation/avasynchronousvideocompositionrequest/sourcesamplebuffer(bytrackid:).md)
- [sourceTaggedDynamicBuffers(byTrackID:)](avfoundation/avasynchronousvideocompositionrequest/sourcetaggeddynamicbuffers(bytrackid:).md)
- [sourceTimedMetadata(byTrackID:)](avfoundation/avasynchronousvideocompositionrequest/sourcetimedmetadata(bytrackid:).md)
- [sourceTrackIDs](avfoundation/avasynchronousvideocompositionrequest/sourcetrackids.md)