<!--
{
  "availability" : [
    "macOS: 15.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "VideoToolbox",
  "identifier" : "/documentation/VideoToolbox/VTExtensionPropertiesKey",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "Video Toolbox"
    ],
    "preciseIdentifier" : "c:@T@VTExtensionPropertiesKey"
  },
  "title" : "VTExtensionPropertiesKey"
}
-->

# VTExtensionPropertiesKey

A key in a Media Extension extension properties dictionary.

```
struct VTExtensionPropertiesKey
```

## Topics

### Keys

[`kVTExtensionProperties_CodecNameKey`](/documentation/VideoToolbox/kVTExtensionProperties_CodecNameKey)

A dictionary key for the user readable name string of the codec.

[`kVTExtensionProperties_ContainingBundleNameKey`](/documentation/VideoToolbox/VTExtensionPropertiesKey/containingBundleName)

A dictionary key for the extension host application localized name.

[`kVTExtensionProperties_ContainingBundleURLKey`](/documentation/VideoToolbox/VTExtensionPropertiesKey/containingBundleURL)

A dictionary key for the URL of the extension host application.

[`kVTExtensionProperties_ExtensionIdentifierKey`](/documentation/VideoToolbox/VTExtensionPropertiesKey/extensionIdentifier)

A dictionary key for the video decoder extension identifier.

[`kVTExtensionProperties_ExtensionNameKey`](/documentation/VideoToolbox/VTExtensionPropertiesKey/extensionName)

A dictionary key for the localized extension name.

[`kVTExtensionProperties_ExtensionURLKey`](/documentation/VideoToolbox/VTExtensionPropertiesKey/extensionURL)

A dictionary key for the URL of the extension.

### Initializers

[`init(rawValue:)`](/documentation/VideoToolbox/VTExtensionPropertiesKey/init(rawValue:))

## Relationships

### Conforms To

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)