Unknown decoder 'aac_lc' - when playing MKV from Roku

Plex Media Server
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1

Server Version#: 1.23.2.4656

I have recently upgraded the plexserver on my Ubuntu server from 1.22.3.4523 to the newer 1.23.X.XXXX versions. I have tried each version as they come out with the version number 1.23.X but when playing MKV video files from a Roku I always get the following error.

[Transcoder] Unknown decoder 'aac_lc' in the logs.

If I revert back to the older 1.22.3.4523 version and the error stops and the video plays as normal. The error only shows when trying to access from a Roku device.

I like to keep my software up to date but this is preventing me from being able to update the plexserver.

Does anyone have some thoughts on how to address this. I have looked through older post related to this and tried it all, nothing seems to work.

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Is anyone else having this issue? Even with the latest update the issue still exists.

3
  1. Stop Plex
  2. (presuming you run PMS as the default user plex)
  3. sudo chown -R plex:plex /var/lib/plexmediaserver
  4. Start Plex
  5. Try again.
  6. If still failing, Stop again
    a. Terminal session
    b. sudo bash
    c cd /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Codecs
    d. rm -rf * (it will remove what is likely damaged)
    e. Restart
    f. It will require a few extra seconds to get each codec again (download) the first time it plays but the codec will be local after that.
4

I tried all of that and it didn’t help. I just installed 1.23.6.4881-e2e58f321 that was updated yesterday and it appears to have fixed the issue.

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