---
title: mediaSubTypes
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmediaselectionoption/mediasubtypes
---

# mediaSubTypes

The media sub-types of the media data associated with the option.

## Declaration

```swift
var mediaSubTypes: [NSNumber] { get }
```

## Discussion

Discussion The value is an array of NSNumber objects carrying four character codes (of type FourCharCode) as defined in CoreAudioTypes.h for audio media and in CMFormatDescription.h for video media. Also see CMFormatDescriptionGetMediaSubType(_:) for more information about media subtypes.

## See Also

### Accessing media information

- [mediaType](avfoundation/avmediaselectionoption/mediatype.md)
- [hasMediaCharacteristic(_:)](avfoundation/avmediaselectionoption/hasmediacharacteristic(_:).md)