---
title: requiredSourceSampleDataTrackIDs
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmutablevideocompositioninstruction/requiredsourcesampledatatrackids
---

# requiredSourceSampleDataTrackIDs

The track identifiers of source sample data that the compositor requires to compose frames for the instruction.

## Declaration

```swift
var requiredSourceSampleDataTrackIDs: [NSNumber] { get set }
```