---
title: canContainFragments
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avasset/cancontainfragments
---

# canContainFragments

A Boolean value that indicates whether you can extend the asset by fragments.

## Declaration

```swift
var canContainFragments: Bool { get }
```

## Discussion

Discussion For QuickTime movie files and MPEG-4 files, the value is true if an mvex box is present in the moov box. For those types, the mvex box signals the possible presence of later moof boxes.