# 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:** 5
**Page:** 1
### Author:  [@Charvelx04](https://community.mp3tag.de/u/Charvelx04)
#### Post date: [May 7, 2022, 8:35pm UTC](https://community.mp3tag.de/t/not-all-mkvs-seen/57246/1 "2022-05-07T20:35:41Z")
Okay... quick question.
Seeing as MP3Tag is the only tagging app I've found that recognizes nearly all the categories of metadata in an MKV file type, (I've tried using MKVToolNix and can't find, say the "comments" section).. I've noticed that sometimes the app doesn't recognize every MKV file, even when the files are all created by the same encoding app, like MKVMerge.
I like using the comments section in metadata because with Explorer it's easier to separate TV shows by the season.. S1, S2 etc. Now, some of my files reach near the 15 to 20GB file size mark, and re-encoding takes some serious firepower.. so, what am I missing to help the app recognize the missing file?
If a screen shot is needed, or info from the app... please let me know, or if I'm not clarifying clearly.
Thank you.
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### Author:  [@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")
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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### Author:  [@Charvelx04](https://community.mp3tag.de/u/Charvelx04)
#### Post date: [May 7, 2022, 10:23pm UTC](https://community.mp3tag.de/t/not-all-mkvs-seen/57246/3 "2022-05-07T22:23:35Z")
I appreciate the response.
I've tried to look thru each line of available metadata to see if there was something the encoder missed, but MKVToolNix doesn't show half of what MP3Tag can.. and it's more detailed in areas I don't really need.
I can try to re-encode it to another MKV container (I did this to MP4, but nearly doubled the bit rate and file size), maybe like you mentioned, something went wrong in the mass of 1's n 0's that just aren't visible to you and I, but are to MP3Tag.
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### Author:  [@Charvelx04](https://community.mp3tag.de/u/Charvelx04)
#### Post date: [May 8, 2022, 9:34pm UTC](https://community.mp3tag.de/t/not-all-mkvs-seen/57246/4 "2022-05-08T21:34:15Z")
Well, I went ahead and re-encoded back to another MKV container. MP3Tag sees it with no issue now.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [June 7, 2022, 9:34pm UTC](https://community.mp3tag.de/t/not-all-mkvs-seen/57246/5 "2022-06-07T21:34:31Z")
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