---
title: alternateGroupID
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmutablemovietrack/alternategroupid
---

# alternateGroupID

A number that identifies the track as a member of a particular alternate group.

## Declaration

```swift
var alternateGroupID: Int { get set }
```

## See Also

### Configuring track information

- [isModified](avfoundation/avmutablemovietrack/ismodified.md)
- [mediaDataStorage](avfoundation/avmutablemovietrack/mediadatastorage.md)
- [sampleReferenceBaseURL](avfoundation/avmutablemovietrack/samplereferencebaseurl.md)