Was watching a movie no problem. Went to enable subtitles. Next playback attempt resulted in “Playback Error: Conversion Failed. A required codec could not be found or failed to install.” After pretty much each of the following hacks, I right-click exited the Plex systray icon and re-launched:
Moved the .sub file away from the movie file.
Tried disabling HDR tone mapping, then video stream transcoding.
Tried deleting transcoder folder\Codecs.
Tried moving transcoder folder location to c:\Windows\Temp\Plex.
Tried uninstalling Plex Media Server and using the Microsoft Store to reinstall.
Tried uninstalling NVidia display driver and reinstalling from scratch. NVidia driver is from 2025.02.13.
Tried renaming “%localappdata%\Plex Media Server” and re-defining my media libraries
After each of these trial-and-error steps, the error persists with every media file I attempt to playback. In case it helps, I have almost all of my media files stored as MKV files encoded in HEVC+AAC.
Welp. I was hoping this fix would be measured in minutes, maybe hours. Doesn’t look like that’s going to happen. Would you care to attach a copy of your November 28, 2024 aac_decoder.dll that I could paste into my Plex Media Server application directory till the Plex publishers get their poop in a group wrt this library hash mismatch?
Failed for me on 1.41.4.9463. Exited the PMS systray app. Removed “%localappdata%\Plex Media Server\Codecs”. Relaunched Plex Media Server. Played back a movie with an AAC audio track. “%localappdata%\Plex Media Server\Codecs\e613bce-97f23d579c1001d8e9cc0d2e-windows-x86_64” reappeared but is empty. Codecs still aren’t downloading.
@chuckpa This did not work for me on Plex Media Server v1.41.4.9463-630c9f557
Feb 15, 2025 02:16:15.732 [131167386872632] INFO - [Req#4c/Transcode] CodecManager: obtaining decoder 'h264'
Feb 15, 2025 02:16:15.732 [131167386872632] DEBUG - [Req#4c/Transcode/HCl#2c] HTTP requesting GET https://plex.tv/api/codecs/h264_decoder?build=linux-x86_64-standard&deviceId=32b9a9b7-9208-4980-ad6f-e31c722ff872&oldestPreviousVersi
Feb 15, 2025 02:16:15.825 [131167428815672] DEBUG - [HttpClient/HCl#2c] HTTP/1.1 (0.1s) 200 response from GET https://plex.tv/api/codecs/h264_decoder?build=linux-x86_64-standard&deviceId=32b9a9b7-9208-4980-ad6f-e31c722ff872&oldestP
Feb 15, 2025 02:16:15.825 [131167424621368] DEBUG - [Req#4c/Transcode/GetFile/HCl#2d] HTTP requesting GET https://downloads.plex.tv/codecs/e613bce-97f23d579c1001d8e9cc0d2e/linux-x86_64-standard/libh264_decoder.so
Feb 15, 2025 02:16:15.828 [131167302986552] DEBUG - [PubsubServerManager/process/HCl#2e] HTTP requesting GET https://plex.tv/services/pubsub/servers
Feb 15, 2025 02:16:15.890 [131167428815672] DEBUG - [HttpClient/HCl#2e] HTTP/1.1 (0.1s) 200 response from GET https://plex.tv/services/pubsub/servers (reused)
Feb 15, 2025 02:16:16.004 [131167428815672] DEBUG - [HttpClient/HCl#2d] HTTP/2.0 (0.2s) 200 response from GET https://downloads.plex.tv/codecs/e613bce-97f23d579c1001d8e9cc0d2e/linux-x86_64-standard/libh264_decoder.so (reused)
Feb 15, 2025 02:16:16.028 [131167424621368] ERROR - [Req#4c/Transcode] Codecs: Download failed: Failed to verify SHA1sum of codec!
Feb 15, 2025 02:16:16.028 [131167386872632] ERROR - [Req#4c/Transcode] Error configuring transcoder: Decoder install failed: h264
Feb 15, 2025 02:16:16.028 [131167386872632] DEBUG - [Req#4c/Transcode] Streaming Resource: Terminating session 0x774bcbc96938:hl56qze0lni20sidzok4hmpe which is using 695kbps of WAN bandwidth. Used is now 0kbps
Feb 15, 2025 02:16:16.028 [131167386872632] DEBUG - [Req#4c/Transcode] Streaming Resource: Terminated session 0x774bcbc96938:hl56qze0lni20sidzok4hmpe with reason Conversion failed. A required codec could not be found or failed to i
Feb 15, 2025 02:16:16.028 [131167298792248] DEBUG - [Req#4c/Transcode] Killing job.
You sir are a hero. Ive been tearing my hair ouit for a few hours now. This got me back up and running until they fix whatevers messed up on the backend
Completed Windows 11 2-2025 cumulative updates, defender definitions, and .net desktop runtime 8.0.13.
Also ran updates for plex media server and experiece the same thing. Live TV from HD homerun tuner and media library files are failing to playback. Also confirmed removing the codec folder in appdata did not work. Folder is recreated however is not filled with anything.
