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# quickTimeMetadataLivePhotoVitalityScore

An identifier that represents the vitality score of the Live Photo movie.

```
static let quickTimeMetadataLivePhotoVitalityScore: AVMetadataIdentifier
```

## Discussion

Live Photo movies may be algorithmically scored from `0.0` to `1.0` on their level of vitality. A Live Photo movie with a low vitality score offers little dynamism to the still photo it accompanies. The vitality score is normalized and independent of the vitality scoring version of the algorithm defined by [`quickTimeMetadataLivePhotoVitalityScoringVersion`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLivePhotoVitalityScoringVersion).

If a Live Photo movie contains the [`quickTimeMetadataAutoLivePhoto`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataAutoLivePhoto) key and its value is nonzero, apps should read the [`quickTimeMetadataLivePhotoVitalityScore`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLivePhotoVitalityScore) value and only display the movie’s content if the score is `0.5` or higher.

If the capture session includes a metadata output configured to provide face, dog, or cat metadata objects, their presence greatly increases the vitality score.

---

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