# \[RFE\] support of entire ID3v2.4 standard
**URL:** https://community.mp3tag.de/t/rfe-support-of-entire-id3v2-4-standard/12306
**Category:** General Discussion
**Created:** [July 21, 2011, 10:26am UTC](https://community.mp3tag.de/t/rfe-support-of-entire-id3v2-4-standard/12306 "2011-07-21T10:26:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@chrizoo](https://community.mp3tag.de/u/chrizoo)
#### Post date: [July 21, 2011, 10:26am UTC](https://community.mp3tag.de/t/rfe-support-of-entire-id3v2-4-standard/12306/1 "2011-07-21T10:26:29Z")
request for enhancement: support of entire [ID3v2.4 standard as defined by www.ID3.org](http://www.id3.org/id3v2.4.0-frames)
As a look-up reference, these are the id3v2.4 fields not yet supported by MP3Tag.
I will update the list and strike through any fields implemented by MP3Tag in the future.
(in case a field listed here is already supported or changes from unsupported to supported, please post here)
```
AENC Audio encryption
ASPI Audio seek point index
COMR Commercial frame
ENCR Encryption method registration
EQU2 Equalisation
ETCO Event timing codes
GEOB General encapsulated object
GRID Group identification registration
LINK Linked information
MCDI Music CD identifier
MLLT MPEG location lookup table
OWNE Ownership frame
PCNT Play counter
POSS Position synchronisation frame
PRIV Private frame
RBUF Recommended buffer size
RVA2 Relative volume adjustment
RVRB Reverb
SEEK Seek frame
SIGN Signature frame
SYLT Synchronised lyric/text
SYTC Synchronised tempo codes
TDLY Playlist delay
TPRO Produced notice
UFID Unique file identifier
USER Terms of use
```
---
### Author:  [@chrizoo](https://community.mp3tag.de/u/chrizoo)
#### Post date: [July 24, 2011, 11:55am UTC](https://community.mp3tag.de/t/rfe-support-of-entire-id3v2-4-standard/12306/2 "2011-07-24T11:55:13Z")
Particularly needed, from my perspective, would be for example **SYLT** (=lyrics with timecodes, which can scroll down as you sing along or even be displayed karaoke-style). Feature request and reasons [here](https://community.mp3tag.de/t/8669/1).
Also useful is **UFID**. That's where a song's unique ID can be stored, such as a MusicBrainz ID retrieved through acoustic fingerprinting. UFID support in MP3Tag would allow adding a file ID column, showing the user which files already have and which still need identification.
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [July 24, 2011, 4:40pm UTC](https://community.mp3tag.de/t/rfe-support-of-entire-id3v2-4-standard/12306/3 "2011-07-24T16:40:20Z")
UFID is supported with the field name UNIQUEFILEID
---
### Author:  [@chrizoo](https://community.mp3tag.de/u/chrizoo)
#### Post date: [July 24, 2011, 7:02pm UTC](https://community.mp3tag.de/t/rfe-support-of-entire-id3v2-4-standard/12306/4 "2011-07-24T19:02:05Z")
thank you dano.
I got MP3Tag to write to UFID via UNIQUEFILEID, but neither tag panel nor custom columns can read preexisting UFID frames (with MusicBrainz ID) via UNIQUEFILEID or %UNIQUEFILEID%.
Why is that?
This internal variable is undocumented in the [mapping table](https://docs.mp3tag.de/mapping) and unlisted in MP3Tag's various dropdown lists (see screenshot). It should be added, if indeed supported.
I could however display the UFID content in columns and tag panel via %MusicBrainz\_TrackID%. As the owner identifier here is "[http://musicbrainz.org](http://musicbrainz.org)" , I guess this also is an undocumented internal mapping.
