Contains metadata for the input attached to the specified context
[n]@metadata md_title_album::Ballads In White Forest (2008) md_title_artist::ALONE IN THE CHAOS md_title_bitrate::188000 md_title_comment::http://www.jamendo.com/ md_title_duration::254066 md_title_mediatype::4 md_title_name::0000025 md_title_samplerate::44100 md_title_seekable::1 md_title_track::1 url::/accounts/1000/shared/music/set006/01 - 0000025.mp3
The attributes published to this object depend on the media file type of the input.