# init(mediaSubtypesForNativeRepresentation:) Creates an initialized legible-output object. ``` init(mediaSubtypesForNativeRepresentation subtypes: [NSNumber]) ``` ## Parameters `subtypes` An of FourCC codes. ## Return Value An initialized instance of `AVPlayerItemLegibleOutput`. ## Discussion When creating an instance you add media subtype FourCC codes as `NSNumber` objects to the `subtypes` array to elect to receive that type as a instead of an attributed string. FourCC codes are converted to `NSNumber` objects as shown: ```objc @[ [NSNumber numberWithUnsignedInt:'tx3g'] ] ``` Initializing an `AVPlayerItemLegibleOutput` using the `init` method (which is preferred) is equivalent to calling this method with an empty `subtypes` array, which means that all legible data, regardless of media subtype, is delivered using instances in a common format. If a media subtype for which there is no legible data in the current player item is included in the media `subtypes` array, no error occurs. An `AVPlayerItemLegibleOutput` instance doesn’t vend closed caption data as a , so it is an error to include `'c608'` in the media subtypes array. > Note: > The preferred method of creating an `AVPlayerItemLegibleOutput` object is to use the method. --- Copyright © 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)