# Cannot open MP4s to change tag data

**URL:** https://community.mp3tag.de/t/cannot-open-mp4s-to-change-tag-data/44896
**Category:** Support
**Created:** [March 19, 2019, 2:23am UTC](https://community.mp3tag.de/t/cannot-open-mp4s-to-change-tag-data/44896 "2019-03-19T02:23:37Z")
**Posts on this page:** 1
**Showing post:** 2

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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 19, 2019, 6:15am UTC](https://community.mp3tag.de/t/cannot-open-mp4s-to-change-tag-data/44896/2 "2019-03-19T06:15:23Z")

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> [@JAMotter](#):
>
> Does anyone have any suggestions?

I found this thread:

> [@Tags not saved in mp4 files](https://community.mp3tag.de/t/tags-not-saved-in-mp4-files/14151):
>
> I'm trying to add titles, album, artist tags to a set of mp4 files. No error shows up when I tell it to save the tags, but the files do not have any tags in them. As a result this software seems totally useless. What am I doing wrong? I've tried several versions of mp3tag including 2.53 with no change in behavior. I don't see any way to make it work and there is no documentation pointing me to what I'm doing wrong.

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