# Not all MKVs seen

**URL:** https://community.mp3tag.de/t/not-all-mkvs-seen/57246
**Category:** Support
**Created:** [May 7, 2022, 8:35pm UTC](https://community.mp3tag.de/t/not-all-mkvs-seen/57246 "2022-05-07T20:35:41Z")
**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: [May 7, 2022, 8:49pm UTC](https://community.mp3tag.de/t/not-all-mkvs-seen/57246/2 "2022-05-07T20:49:07Z")

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I don't know if this is also the case:

> [@Certain .m4b files to not be recognized in mp3tag](https://community.mp3tag.de/t/certain-m4b-files-to-not-be-recognized-in-mp3tag/57103):
>
> I have been trying to go through my audiobook collection and add a bunch of tags for better library management, but about 1/3 of my files are not recognized when I open a directory. Some of these files have come directly from Audible, via the OpenAudible program - so it gets the Audible files and converts them to .m4b. I then copied those files over to my library and used Readarr to rename/reorganize them. Now, some of them show up in mp3tag, and some of them don't. I cannot figure out what …

(a different file format, I know - but in the end it turns out that the m4b files had problems and MP3tag refused to load those)

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