# Mp4: No longer any tag changes supported

**URL:** https://community.mp3tag.de/t/mp4-no-longer-any-tag-changes-supported/56172
**Category:** Support
**Created:** [February 2, 2022, 10:24am UTC](https://community.mp3tag.de/t/mp4-no-longer-any-tag-changes-supported/56172 "2022-02-02T10:24:31Z")
**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: [February 2, 2022, 10:34am UTC](https://community.mp3tag.de/t/mp4-no-longer-any-tag-changes-supported/56172/2 "2022-02-02T10:34:58Z")

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Have you checked the files for consistency?  
See suggestions for tools here:

> [@How to check files for errors?](https://community.mp3tag.de/t/how-to-check-files-for-errors/44633):
>
> It’s required and often helps to reduce support cycles to check files for errors before filing a bug report. Symptoms of erroneous files are often missing or wrong bitrate or length audible blips or skips tags seem to be sticky and cannot be removed There are some really good tools to check the files for errors, namely MP3 Diags — identifies many different issues in MP3 files Website: [http://mp3diags.sourceforge.net](http://mp3diags.sourceforge.net) Download: [MP3 Diags - Getting MP3 Diags](http://mp3diags.sourceforge.net/010_getting_the_program.html#binWindows) If the font size in MP3 Diags is …

You probably need Foobar2000 to check mp4 files.

Did you convert the files with some kind of online service?  
Then it is fairly likely that you got files with an invalid format back.

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_[View the full topic](https://community.mp3tag.de/t/mp4-no-longer-any-tag-changes-supported/56172)._