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# AVAssetDurationDidChange

A notification the system posts when a fragmented asset minder observes a change to a fragmented asset’s duration.

```
static let AVAssetDurationDidChange: NSNotification.Name
```

## Discussion

The system posts this notification only for changes that occur after an asset’s <doc://com.apple.documentation/documentation/AVFoundation/AVAsset/duration> property reaches a <doc://com.apple.documentation/documentation/AVFoundation/AVKeyValueStatus/loaded> status.

---

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