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

Use -[AVAssetWriter setMetadata:].

This is set to an NSArray of AVMutableMetadataItems. Note that you cannot set the value after writing has started.

Metadata keys and keyspaces are listed in AVMetadataFormat.h.