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# AVMovieShouldSupportAliasDataReferencesKey

A key that specifies a Boolean value that indicates whether the system parses and resolves alias data references in the movie.

```
let AVMovieShouldSupportAliasDataReferencesKey: String
```

## Discussion

The default value is <doc://com.apple.documentation/documentation/Swift/false>. Most QuickTime movie files contain all of the media data they require, but some contain references to media stored in other files. While AVFoundation and CoreMedia typically use a URL reference for this purpose, older implementations such as QuickTime 7 have commonly used a Macintosh alias instead, as documented in the QuickTime File Format specification. If your app must work with legacy QuickTime movie files containing alias-based references to media data stored in other files, set this value to <doc://com.apple.documentation/documentation/Swift/true>.

If you provide a value for [`AVMovieReferenceRestrictionsKey`](/documentation/AVFoundation/AVMovieReferenceRestrictionsKey), the movie observes these restrictions for resolved alias references just as they’re for URL references.

---

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