# MP4-Tags with superfluous null bytes at the end are not shown in MP3TAG

**URL:** https://community.mp3tag.de/t/mp4-tags-with-superfluous-null-bytes-at-the-end-are-not-shown-in-mp3tag/56526
**Category:** Support
**Created:** [February 28, 2022, 11:14pm UTC](https://community.mp3tag.de/t/mp4-tags-with-superfluous-null-bytes-at-the-end-are-not-shown-in-mp3tag/56526 "2022-02-28T23:14:47Z")
**Posts on this page:** 1
**Showing post:** 23

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [March 2, 2022, 1:47pm UTC](https://community.mp3tag.de/t/mp4-tags-with-superfluous-null-bytes-at-the-end-are-not-shown-in-mp3tag/56526/23 "2022-03-02T13:47:49Z")

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> [@webshield](#):
>
> Maybe I can even solve this automatically

> [@webshield](#):
>
> I tried in iTunes manually copying the Album/Künstler into the AlbumPerformer/sort field,

Here is a post from the HowTos how to copy one tag field into another:

> [@Actions and batch-operations](https://community.mp3tag.de/t/actions-and-batch-operations/967/15):
>
> How to copy one field value to another field? Example how to copy the content of the ARTIST field to the ALBUMARTIST field: Create a [new action](https://community.mp3tag.de/t/actions/967/2) in an existing action group or make a new action group. Action type: Format value Field: ALBUMARTIST Format string: %artist% Note: If you want to copy all possible values of a field (in case you have multiple artist fields), the internal scripting function [$meta\_sep](https://docs.mp3tag.de/scripting) can be used in the format string, e.g., $meta\_sep(artist,\\\\)

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