---
title: "addTracks(for:preferredStartingTrackID:)"
framework: avfoundation
role: symbol
role_heading: Instance Method
path: "avfoundation/avmutablecomposition/addtracks(for:preferredstartingtrackid:)"
---

# addTracks(for:preferredStartingTrackID:)

## Declaration

```swift
func addTracks(for cinematicAssetInfo: CNAssetInfo, preferredStartingTrackID: CMPersistentTrackID) -> CNCompositionInfo
```