# Solved - Conversion failed. A required codec could not be found or failed to install

**URL:** <https://forums.plex.tv/t/solved-conversion-failed-a-required-codec-could-not-be-found-or-failed-to-install/938615>\
**Category:** Plex Media Server\
**Tags:** server-truenas\
**Created:** [May 7, 2026, 11:09am UTC](https://forums.plex.tv/t/solved-conversion-failed-a-required-codec-could-not-be-found-or-failed-to-install/938615 "2026-05-07T11:09:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![hero21b](https://avatars.discourse-cdn.com/v4/letter/h/5f9b8f/32.png) [@hero21b](https://forums.plex.tv/u/hero21b)\
**Post date:** [May 7, 2026, 11:09am UTC](https://forums.plex.tv/t/solved-conversion-failed-a-required-codec-could-not-be-found-or-failed-to-install/938615/1 "2026-05-07T11:09:28Z")

</div>

Server Version#: v1.43.1.10611-1e34174b1

I received this error on certain filetypes when trying to play, and found a specific codec was failing to install properly. The codec filename had a .tmp extension which was preventing the codec from working. I am also using a truenas sever (HexOS) and for some reason my SMB sharing wouldn’t work on windows, so I figured out how to navigate using the shell to remove the .tmp extension. This is not a skill I have without Googling so I am posting it here to help others and save the info for myself in future.

The error message:

 ![Plex Playback Error](https://global.discourse-cdn.com/plex/original/4X/0/9/3/093bbf7c4c8c06faca0cfd496d68a62326099683.png)

The fix (your own filepath and filenames will have to be substituted):

 ![Screenshot 2026-05-07 045050](https://global.discourse-cdn.com/plex/original/4X/3/1/5/3150ff28ada3580514821389b2fbac6c6786f9e2.png)

I hope this helps somebody.