trackID
An integer that identifies the track within the media asset.
Declaration
var trackID: CMPersistentTrackID { get }Discussion
The track ID uniquely identifes the track within a MEFormatReader object. Track IDs must be unique within a media asset but don’t need to be unique across assets. If a media format doesn’t have a native concept of track IDs, track IDs can start from 1. However, track ID 0 is a reserved value to indicate an invalid track ID.