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# isMainProgramContent

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

```
static let isMainProgramContent: AVMediaCharacteristic
```

## Discussion

Example: an option that presents the main program audio for the presentation, regardless of locale, would typically have this characteristic.

The value of this characteristic is `public.main-program-content`.

The system infers the presence of this characteristic for a media option; it considers any option that doesn’t have the characteristic [`isAuxiliaryContent`](/documentation/AVFoundation/AVMediaCharacteristic/isAuxiliaryContent) to be main content.

---

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