--custom-meta 'album=%(playlist_title)s' will not have an album tag for media with playlist_title, as opposed to having it set to NA. This is more in line with --add-metadata's behavior
--custom-meta 'album=%(playlist_title)s' will not have an album tag for media with playlist_title, as opposed to having it set to NA. This is more in line with --add-metadata's behavior