---
title: mediaExtensionProperties
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avurlasset/mediaextensionproperties
---

# mediaExtensionProperties

The properties of the media extension format reader that decodes the asset.

## Declaration

```swift
var mediaExtensionProperties: AVMediaExtensionProperties? { get }
```

## Discussion

Discussion If the system decodes the asset using a MediaExtension format reader, the property value contains a valid object that describes the extension. Otherwise, this property value is nil.

## See Also

### Accessing Media Extension properties

- [AVMediaExtensionProperties](avfoundation/avmediaextensionproperties.md)