MusicBrainz Tag: Difference between revisions

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#REDIRECT [[MusicBrainz Picard]]
=MusicBrainz Metadata Tags (ID3 and Vorbis/FLAC Comment)=

'''Status:''' ''The information on this page is complete as of tunepimp CVS snapshot 2005-10-28.''

Applications that read or write metadata tags from music files should follow one consistent specification for what [[MusicBrainz]] information is stored where and in what tag. That way all the work of the various tagger applications will contribute to a well connected and clean body of metadata. Any application that deals with music should be able to read the [[MusicBrainz Identifier|MusicBrainzIdentifier]]<code><nowiki></nowiki></code>s from a music file in order to communicate unambiguously about the music it's working with.

==ID3v2 Tag specifications==

See [[ID3v2 Tags|ID3v2Tags]] for a list of proposed frames tagger applications could write. The following descriptions are summerized in a table below, for more information on how to use ID3v2 tags in your own applications read the specifications on [http://www.id3.org/ http://www.id3.org/].

Note: for each text frame ('''T'''XXX) the encoding of the value strings can be defined in the frame header. ID3v2.3 supports UTF-16 and ISO-8859-1 encoded strings; ID3v2.4 has addional support for UTF-8 and UTF-16BE. [[MusicBrainz]] Identifiers must be encoded as ISO-8859-1 strings.

ID3v2 frames can be stored in any order in the MP3 file.

===General Frames===

The following frames are used for the regular information from the database: '''TPE1''' for the main artist name, '''TALB''' for the album name, '''TIT2''' for the track title, '''TRCK''' for the track number on the album (without total number of tracks).

'''TCMP''' is a nonstandard tag that defines a track as being part of a compilation (VA album) if set to '''1''' or part of a single artist album if set to '''0'''. It is used by the iTunes music player software.

====Artist Sortname====

The artist sortname is stored in the '''TSOP''' frame for ID3v2.4 and in the experimental '''XSOP''' frame for ID3v2.3.

====Release Date====

ID3v2.3 is missing a standard frame for a detailed date. Therefore the experimental '''XDOR''' frame is used and the additional '''TORY''' that stores the year of release as a 4 digit number only is used.

In ID3v2.4 only the '''TDRL''' frame is used to store the complete release date in <code><nowiki>yyyy-MM-dd</nowiki></code> format.

===Music Brainz Identifier===

To store the [[MusicBrainz Identifier|MusicBrainzIdentifier]]<code><nowiki></nowiki></code>s in an ID3v2 tag, you will need to use a '''UFID''' frame for the Track Id, and some user defined '''TXXX''' text frames for the artist, album, album artist and trm identifiers as well as the album status and type. Please note that for ease of use these ID3 frames are specified to use ISO 8859-1. However, the types of characters used to express these tags are the same in ISO 8895-1 and UTF-8, since UTF-8 is backward compatible with 7-bit ASCII.

====MusicBrainz Track Identifier:====

The ''MusicBrainz Track Id'' is the internal unique ID [[MusicBrainz]] defines for every object in its database. It is stored in the special '''UFID''' frame, that contains two parts: The ''Owner Identifier'' selects the namespace where the identifies is unique. For [[MusicBrainz]] it is be guaranteed that this ID is unique on the server; therefore the default owner identifier is <code><nowiki>http://musicbrainz.org</nowiki></code>. The second part is the UUID for the track as stored in the [[MusicBrainz]] database.

====MusicBrainz Artist Identifier:====

The ''MusicBrainz Artist Id'' is stored in a user defined '''TXXX''' text information frame, encoded as a <code><nowiki>0x00</nowiki></code> terminated ISO-8859-1 string. Its value is the artist UUID as stored in the [[MusicBrainz]] database.

====MusicBrainz Album Identifier:====

The ''MusicBrainz Album Id'' is stored in a user defined '''TXXX''' text information frame, encoded as a <code><nowiki>0x00</nowiki></code> terminated ISO-8859-1 string. Its value is the album UUID as stored in the [[MusicBrainz]] database.

====MusicBrainz Album Artist Identifier:====

The ''MusicBrainz Album Artist Id'' is used to store an artist identifier for the album the track is on. At the moment, this is only used for Various Artists albums where the tracks have multiple different artists and the album itself is by the special artist ''Various Artists'' with UUID <code><nowiki>89ad4ac3-39f7-470e-963a-56509c546377</nowiki></code>.

It is stored in a user defined '''TXXX''' text information frame, encoded as a <code><nowiki>0x00</nowiki></code> terminated ISO-8859-1 string. Its value is the artist UUID as stored in the [[MusicBrainz]] database.

====MusicBrainz Album Status====

This stores the status of the album the track is from, encoded as a <code><nowiki>0x00</nowiki></code> terminated ISO-8859-1 string. At the moment the possible values are: ''official'', ''promotional'', ''bootleg''.

====MusicBrainz Album Type====

This type the status of the album the track is from, encoded as a <code><nowiki>0x00</nowiki></code> terminated ISO-8859-1 string. Possible values are: ''album'', ''single'', ''live'' e.a.

====MusicBrainz TRM Identifier:====

The ''MusicBrainz TRM Id'' is stored in a user defined '''TXXX''' text information frame, encoded as a <code><nowiki>0x00</nowiki></code> terminated ISO-8859-1 string. Its value is the track's TRM UUID as stored in the [[MusicBrainz]] database.

==Vorbis/FLAC comment specifications==

In contrast to the various possibilities of ID3 tagging, Vorbis and FLAC tags are stored in a unified way. All strings are encoded as UTF-8, tagged data is stored in the so called [http://www.xiph.org/vorbis/doc/v-comment.html comment header], each key value pair is specified as a tripplet of the form: <code><nowiki>[length in bytes][key]=[value]</nowiki></code>. Strings are not terminated. For additional information see [http://reactor-core.org/ogg-tag-recommendations.html recommendations].

The different comment names and their equivalent ID3v3 frames can be found in the table below.

==Overview==

{| border="1"
|-
| '''ID3v2.3 frame''' || '''ID3v2.4 frame''' || '''Value''' || '''Description''' (TXXX only) || '''Vorbis/FLAC comments'''
|-
| TPE1 || TPE1 || [artist name] || || ARTIST
|-
| TALB || TALB || [album title] || || ALBUM
|-
| TIT2 || TIT2 || [track title] || || TITLE
|-
| TRCK || TRCK || [track number] || || TRACKNUMBER
|-
| XSOP || TSOP || [artist sortname] || || MUSICBRAINZ_SORTNAME
|-
| TORY || --- || [release year] || || ---
|-
| XDOR || TDRL || [release date] || || DATE
|-
| TXXX || TXXX || [artist UUID] || <code><nowiki>MusicBrainz</nowiki></code> Artist Id || MUSICBRAINZ_ARTISTID
|-
| TXXX || TXXX || [album UUID] || <code><nowiki>MusicBrainz</nowiki></code> Album Id || MUSICBRAINZ_ALBUMID
|-
| TXXX || TXXX || [album artist UUID] || <code><nowiki>MusicBrainz</nowiki></code> Album Artist Id || MUSICBRAINZ_ALBUMARTISTID
|-
| TXXX || TXXX || [album status] || <code><nowiki>MusicBrainz</nowiki></code> Album Status || MUSICBRAINZ_ALBUMSTATUS
|-
| TXXX || TXXX || [album type] || <code><nowiki>MusicBrainz</nowiki></code> Album Type || MUSICBRAINZ_ALBUMTYPE
|-
| TXXX || TXXX || [TRM UUID] || <code><nowiki>MusicBrainz</nowiki></code> TRM Id || MUSICBRAINZ_TRMID
|-
| UFID || UFID || [track UUID] || (OwnerID is: <code><nowiki>http://musicbrainz.org</nowiki></code>) || MUSICBRAINZ_TRACKID
|-
| TCMP || TCMP || if VA then 1 else 0 || || ---
|-
| || || || || RELEASECOUNTRY
|}

----

Authors: [[User:DonRedman|DonRedman]], [[User:Shepard|Shepard]], [[User:Fuchs|Fuchs]][http://www.musicbrainz.org/docs/specs/metadata_tags.html OriginalVersion]

[[Category:To Be Reviewed]] [[Category:Documentation]]

Latest revision as of 22:52, 20 May 2015

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