# Adding "Composer" changes file duration

**URL:** https://community.mp3tag.de/t/adding-composer-changes-file-duration/62320
**Category:** Support
**Created:** [October 7, 2023, 2:40pm UTC](https://community.mp3tag.de/t/adding-composer-changes-file-duration/62320 "2023-10-07T14:40:30Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![MotleyG](https://community.mp3tag.de/user_avatar/community.mp3tag.de/motleyg/32/440_2.png) [@MotleyG](https://community.mp3tag.de/u/MotleyG)
#### Post date: [October 7, 2023, 5:24pm UTC](https://community.mp3tag.de/t/adding-composer-changes-file-duration/62320/4 "2023-10-07T17:24:01Z")

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> [@twsf](#):
>
> These files were very badly modified by MP3Tag and no longer play properly - what is the solution? (If it's helpful at identifiying what is going on, the naming of these files includes Icelandic diacriticals in the performer's name)

I have not seen this kind of mp3tag behaviour myself on any media file format. However there have been similar reports in the last that were confirmed and corrected when files were found to have some kind of error. See this previous thread when making a change to the cover art also changed the reported song length.

> [@Adding a cover may change the length](https://community.mp3tag.de/t/adding-a-cover-may-change-the-length/49722):
>
> Once I add a cover into a mp3 file, Mp3tag may extend its length probably, the bigger cover file is, the longer mp3 file I will get. I'm using Mp3tag v3.02

The tag information is only contained within the file header, this does not affect the actual audio details of the file itself. The length should never be affected by a metadata update.

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_[View the full topic](https://community.mp3tag.de/t/adding-composer-changes-file-duration/62320)._