---
title: preferredMediaChunkAlignment
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmutablemovietrack/preferredmediachunkalignment
---

# preferredMediaChunkAlignment

The boundary for media chunk alignment for file types that support media chunk alignment.

## Declaration

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

## Discussion

Discussion The default value is 0, which indicates to use no padding should to achieve chunk alignment. Setting a negative chunk alignment value causes an error.

## See Also

### Accessing media chunks

- [preferredMediaChunkDuration](avfoundation/avmutablemovietrack/preferredmediachunkduration.md)
- [preferredMediaChunkSize](avfoundation/avmutablemovietrack/preferredmediachunksize.md)