# Unknown Audio **URL:** \ **Category:** General Discussions\ **Created:** [February 18, 2020, 4:14am UTC](https://forums.plex.tv/t/unknown-audio/544182 "2020-02-18T04:14:36Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![OttoKerner](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/ottokerner/32/10079_2.png) [@OttoKerner](https://forums.plex.tv/u/OttoKerner)\ **Post date:** [February 18, 2020, 10:32am UTC](https://forums.plex.tv/t/unknown-audio/544182/7 "2020-02-18T10:32:18Z")
Please peruse these threads. I’m sure there is something in there to give you at least an idea: > [@How to remove tag spam and set language in several MKV files at once](https://forums.plex.tv/t/how-to-remove-tag-spam-and-set-language-in-several-mkv-files-at-once/235537): > > Imagine you have ripped a tv show and the software of your choice has embedded nonsensical things into the ‘title’ tags missed to mark ‘forced’ subtitles as such added titles like ‘Surround 5.1’ to audio tracks (which is redundant, if you’re using Plex) missed to tag the language of audio and/or subtitle tracks Dragging every single episode file into MKVtoolnix and setting all those things right is certainly possible, but repetitive and annoying. If you deal with MKV files, you sooner or la… > [@Set Audio Language tag MP4/MKV](https://forums.plex.tv/t/set-audio-language-tag-mp4-mkv/114491): > > Hi this is a little tutorial about how set lenguage tags on mp4 and mkv files. If you don’t like to see AUDIO tag as “UNKNOWN” on your videos and go from this [image] to this [image] or this [image] to this [image] you just have to: Get [MKVToolNix](https://www.bunkus.org/videotools/mkvtoolnix/downloads.html "MKVToolNix") and [GPAC](https://gpac.wp.mines-telecom.fr/downloads/ "GPAC") both open source free an multiplataform. On Ubuntu: $ sudo echo “deb [http://www.bunkus.org/ubuntu/$](http://www.bunkus.org/ubuntu/%24)(lsb\_release -sc)/ ./” | sudo tee /etc/apt/sources.list.d/mkvtoolnix.list $ wget -q -O - [https://www.bunkus.org/gpg-pub-moritzbunk…](https://www.bunkus.org/gpg-pub-moritzbunkus.txt) > [@Solution for Audio: Unknown](https://forums.plex.tv/t/solution-for-audio-unknown/402270): > > So it really annoyed me to have lots of tvshows with ‘Unknown’ audio stream in my library, and I found out, Plex has serious problem with the .avi container. Since some of the really old tvshows only available in SD with XviD codec, I had to figure out a solution. The basic idea was to convert them into a compatible container. My choice was the .mkv. Found a script made by @ntrevena - thx a lot for them - and modified it a bit, since I didn’t want to reencode those files, only wanted to remux t… --- _[View the full topic](https://forums.plex.tv/t/unknown-audio/544182)._