---
title: renderMetadataSource
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avassettrack/associationtype/rendermetadatasource
---

# renderMetadataSource

Indicates an association between a metadata track and another track where the metadata provides additional information for rendering of that track.

## Declaration

```swift
static let renderMetadataSource: AVAssetTrack.AssociationType
```

## Discussion

Discussion This track association is not symmetric; when used with -[AVAssetWriterInput addTrackAssociationWithTrackOfInput:type:], the receiver should be an instance of AVAssetWriterInput with mediaType, AVMediaTypeMetadata, while the input parameter should be an instance of AVAssetWriterInput for the target track that would be rendered (for example, a video track).

## See Also

### Track association types

- [audioFallback](avfoundation/avassettrack/associationtype/audiofallback.md)
- [chapterList](avfoundation/avassettrack/associationtype/chapterlist.md)
- [forcedSubtitlesOnly](avfoundation/avassettrack/associationtype/forcedsubtitlesonly.md)
- [metadataReferent](avfoundation/avassettrack/associationtype/metadatareferent.md)
- [selectionFollower](avfoundation/avassettrack/associationtype/selectionfollower.md)
- [timecode](avfoundation/avassettrack/associationtype/timecode.md)