# How to edit m4a ©prf tag

**URL:** https://community.mp3tag.de/t/how-to-edit-m4a-prf-tag/67712
**Category:** Support
**Created:** [March 2, 2025, 1:17pm UTC](https://community.mp3tag.de/t/how-to-edit-m4a-prf-tag/67712 "2025-03-02T13:17:07Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [March 2, 2025, 2:09pm UTC](https://community.mp3tag.de/t/how-to-edit-m4a-prf-tag/67712/2 "2025-03-02T14:09:26Z")

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You can have a look here:

> **[Tag Field Mappings – Mp3tag Documentation](https://docs.mp3tag.de/mapping/)**
>
> Overview of all available tag fields, their names in Mp3tag, and how they are mapped to the internal structures of the different tag formats. Mp3tag is the universal Tag Editor.

to check what kind of m4a ©abc fields are already available.

What exactly would ©prf contain?

Update with some more detailed information:  
_(thanks for the hint to @ohrenkino)_

> [@MP4-Felder (Atom/Box) in anderer Software](https://community.mp3tag.de/t/mp4-felder-atom-box-in-anderer-software/48614/2):
>
> FFmpeg Field in Mp3tag ID3v2.3/4 MP4 FFmpeg AVI FourCC TVEPISODEID tven episode\_id TVEPISODE tves (episode\_sort) TVSEASON tvsn (season\_number) DISCNUMBER TPOS disk disc TRACK TRCK trkn track IPRT CONTENTGROUP ©grp grouping CONTENTGROUP TIT1 — TITLE TIT2 ©nam title INAM TITLESORT TSOT sonm title-sort, (sort\_name) TVSHOW tvsh show ALBUM TALB ©alb album IPRD ALBUMSORT TSOA soal album-sort, (sort\_album) ARTIST TPE1 artist IART ARTIST ©art (©ART) a…

So **`©prf`** would be the fieldname for `performers` .  
This atom is currently not supported by Mp3tag up to version v3.28e.

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