---
title: preserveAlternateTracks
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avassettrackgroupoutputhandling/preservealternatetracks
---

# preserveAlternateTracks

A policy that passes through alternate audio tracks from the source asset during export.

## Declaration

```swift
static var preserveAlternateTracks: AVAssetTrackGroupOutputHandling { get }
```

## Discussion

Discussion Setting this policy tells the session to export alternate tracks in a track group without reencoding them.