---
title: extensionURL
framework: videotoolbox
role: symbol
role_heading: Type Property
path: videotoolbox/vtextensionpropertieskey/extensionurl
---

# extensionURL

A dictionary key for the URL of the extension.

## Declaration

```swift
static let extensionURL: VTExtensionPropertiesKey
```

## Discussion

Discussion This key points to a CFURLRef value with the URL for the extension.

## See Also

### Keys

- [containingBundleName](videotoolbox/vtextensionpropertieskey/containingbundlename.md)
- [containingBundleURL](videotoolbox/vtextensionpropertieskey/containingbundleurl.md)
- [extensionIdentifier](videotoolbox/vtextensionpropertieskey/extensionidentifier.md)
- [extensionName](videotoolbox/vtextensionpropertieskey/extensionname.md)