# Incorrect Mapping for "EncodedBy" field with M4A files
**URL:** https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923
**Category:** General Discussion
**Created:** [June 2, 2024, 5:44am UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923 "2024-06-02T05:44:11Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@ShatteredGlass](https://community.mp3tag.de/u/ShatteredGlass)
#### Post date: [June 2, 2024, 5:44am UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923/1 "2024-06-02T05:44:11Z")
I've had an Mp3tag issue on my list for awhile now and took some time today to see if I could figure out if this was a bug with Mp3tag or other software. The issue is with the "ENCODEDBY" field when writing to an M4A file. I noticed that when using Mp3tag to populate this field, it doesn't show up in some other software. After doing some investigating, it appears the reason is because Mp3tag is mapping that field to the "ENCODEDBY" tag instead of the "©enc" field as referenced in the sources listed below. I also provided some screenshots below.
[https://wiki.hydrogenaud.io/index.php?title=Tag\_Mapping#Mapping\_Tables](https://wiki.hydrogenaud.io/index.php?title=Tag_Mapping#Mapping_Tables)
[https://exiftool.org/TagNames/QuickTime.html](https://exiftool.org/TagNames/QuickTime.html)
I also noticed that even on the [Tag Field Mapping](https://docs.mp3tag.de/mapping/#encodedby) page the "MP4" field mapping is missing for "ENCODEDBY", even though I do see other fields with the correct mapping listed, i.e. Artist=©art and Title=©nam
This one has been annoying me for awhile, so hopefully it won't be too much of a hassle to resolve.
Thanks Florian
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [June 6, 2024, 8:04am UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923/2 "2024-06-06T08:04:59Z")
I'm using a user-defined `ENCODEDBY` instead of an implicit mapping to `©enc` for compatibility with other software.
> [@ShatteredGlass](#):
>
> it doesn't show up in some other software
Can you tell the names of those? Also, which one you've used to create the `©enc` atom?
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### Author:  [@ShatteredGlass](https://community.mp3tag.de/u/ShatteredGlass)
#### Post date: [June 10, 2024, 11:39am UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923/3 "2024-06-10T11:39:05Z")
@Florian
[Tag&Rename v3.9.15](https://www.softpointer.com/download.htm) is the one that's creating the ©enc for "EncodedBy", and neither Tag&Rename nor iTunes will read Mp3tag's "ENCODEDBY" tag...
**Using Mp3tag...**
**Using Tag&Rename**
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [June 11, 2024, 1:57pm UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923/4 "2024-06-11T13:57:35Z")
I've moved this to #General Discussion as it's more of a feature request and added the suggested mapping with [Mp3tag v3.26a](https://community.mp3tag.de/t/455).
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### Author:  [@ShatteredGlass](https://community.mp3tag.de/u/ShatteredGlass)
#### Post date: [June 11, 2024, 11:13pm UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923/5 "2024-06-11T23:13:07Z")
Works perfect now! Thank you Florian, much appreciated. 👍
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [July 11, 2024, 11:13pm UTC](https://community.mp3tag.de/t/incorrect-mapping-for-encodedby-field-with-m4a-files/64923/6 "2024-07-11T23:13:47Z")
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