---
title: propagate
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avvideocomposition/perframehdrdisplaymetadatapolicy-swift.struct/propagate
---

# propagate

A policy that passes HDR metadata through, if present on the composed frame.

## Declaration

```swift
static let propagate: AVVideoComposition.PerFrameHDRDisplayMetadataPolicy
```

## See Also

### Policies

- [generate](avfoundation/avvideocomposition/perframehdrdisplaymetadatapolicy-swift.struct/generate.md)