Add custom metadata to video using AVFoundation

Question

I want to add some info (metadata) to a video. I have found a way to retrieve metadata, but did not find any solution to set or modify metadata. I am using AVURLAsset<

Answer 1

When using AVMutableComposition, you can set the metadata property on the AVAssetExportSession when you go to write it out, rather than setting it on the asset (the composition) itself.