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# isAuxiliaryContent

A media characteristic that indicates a track or media selection option includes content its author indicates is auxiliary to the asset’s presentation.

```
static let isAuxiliaryContent: AVMediaCharacteristic
```

## Discussion

An example of auxiliary content is audio commentary about the presentation.

The value of this characteristic is `public.auxiliary-content`.

For QuickTime movies and `.m4v` files, a media option has this characteristic only if the media’s author tags it that way, or if it belongs to an alternate track group that excludes its associated track from autoselection.

---

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