---
title: canContainFragments
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avpartialasyncproperty/cancontainfragments
---

# canContainFragments

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

## Declaration

```swift
static var canContainFragments: AVAsyncProperty<Root, Bool> { get }
```

## Discussion

Discussion Use the load(_:isolation:) method to retrieve the property value. 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.

## See Also

### Loading fragment support

- [containsFragments](avfoundation/avpartialasyncproperty/containsfragments.md)
- [overallDurationHint](avfoundation/avpartialasyncproperty/overalldurationhint.md)