renderMetadataSource
Indicates an association between a metadata track and another track where the metadata provides additional information for rendering of that track.
Declaration
static let renderMetadataSource: AVAssetTrack.AssociationTypeDiscussion
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).