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# hevcDependencyInfo

Additional information that’s necessary to recover complete sample dependency information.

```
@NSCopying optional var hevcDependencyInfo: MEHEVCDependencyInfo { get }
```

## Discussion

This is an optional property that provides additional sample dependency information that [`syncInfo`](/documentation/MediaExtension/MESampleCursor/syncInfo) and [`dependencyInfo`](/documentation/MediaExtension/MESampleCursor/dependencyInfo) don’t provide. Examples of this are the NAL unit type of an HEVC sync sample or the number of samples necessary to refresh the decoder after a USAC independent frame. Don’t implement this property for formats where this information doesn’t make sense.

---

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