---
title: isModified
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmutablemovietrack/ismodified
---

# isModified

A Boolean value that indicates whether a track is in a modified state.

## Declaration

```swift
var isModified: Bool { get set }
```

## Discussion

Discussion This property is YES when the AVMutableMovieTrack object has been modified since it was created, was last written, or had its modified state cleared.

## See Also

### Configuring track information

- [alternateGroupID](avfoundation/avmutablemovietrack/alternategroupid.md)
- [mediaDataStorage](avfoundation/avmutablemovietrack/mediadatastorage.md)
- [sampleReferenceBaseURL](avfoundation/avmutablemovietrack/samplereferencebaseurl.md)