# CONDUCTOR field on MP4 files
**URL:** https://community.mp3tag.de/t/conductor-field-on-mp4-files/12620
**Category:** Support
**Created:** [October 24, 2011, 3:14am UTC](https://community.mp3tag.de/t/conductor-field-on-mp4-files/12620 "2011-10-24T03:14:23Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@djbronko](https://community.mp3tag.de/u/djbronko)
#### Post date: [October 24, 2011, 3:14am UTC](https://community.mp3tag.de/t/conductor-field-on-mp4-files/12620/1 "2011-10-24T03:14:23Z")
Dear community,
I have a little compatibility problem concerning the _CONDUCTOR_ field in MP4 files. I use MP3Tag to tag my audio files (of course 🙂 ) and [MediaPortal](http://www.team-mediaportal.com/) as media center software. MediaPortal relies on _taglib-sharp_ as tagging library. Unfortunately, the _CONDUCTOR_ field written by MP3Tag is not read by MediaPortal.
In the [tag field mappings documentation](https://docs.mp3tag.de/mapping), conductor is not listed for iTunes, so I guess that MP3Tag doesn't treat _CONDUCTOR_ as a predefined field. When I view my MP4 files in a hex editor, I see that MP3Tag writes a _com.apple.iTunes_ atom having its name property set to CONDUCTOR.
I [found out](http://forum.team-mediaportal.com/listen-music-99/issues-album-artist-field-101372/) that MediaPortal is looking for a MP4 atom called _cond_. Thus I tried a custom mapping in MP3Tag from _cond_ to _CONDUCTOR_, but this didn't help. I think this is because MP3Tag writes a _com.apple.iTunes_ atom, and not a _cond_ atom. One of the MediaPortal developers created a tag editor called [MPTagThat](http://www.team-mediaportal.com/extensions/music/mptagthat) which I used for problem analysis. It creates a _cond_ atom on my files.
I don't know if there is a spec for MP4 audio tags, so I don't know how to store the conductor correctly.
Can I configure MP3Tag use _cond_ instead of _com.apple.iTunes_?
If not, see this as a request for enhancement.
---
### Author:  [@djbronko](https://community.mp3tag.de/u/djbronko)
#### Post date: [October 27, 2011, 2:16am UTC](https://community.mp3tag.de/t/conductor-field-on-mp4-files/12620/2 "2011-10-27T02:16:14Z")
Does anyone see a chance to write the _cond_ atom with MP3Tag?
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [October 27, 2011, 8:49am UTC](https://community.mp3tag.de/t/conductor-field-on-mp4-files/12620/3 "2011-10-27T08:49:26Z")
It is not possible.
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:23pm UTC](https://community.mp3tag.de/t/conductor-field-on-mp4-files/12620/4 "2026-02-09T12:23:24Z")