# Transcoding Fails when subtitle track is selected **URL:** \ **Category:** Plex Media Server\ **Tags:** server-asustor\ **Created:** [May 19, 2025, 7:38pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252 "2025-05-19T19:38:14Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![wipeout630](https://avatars.discourse-cdn.com/v4/letter/w/e274bd/32.png) [@wipeout630](https://forums.plex.tv/u/wipeout630)\ **Post date:** [May 19, 2025, 7:38pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/1 "2025-05-19T19:38:14Z")
Server Version#: 1.41.7.9749-ce0b45d6e Player Version#: [app.plex.tv](http://app.plex.tv) (edge browser) Whenever I select a subtitle track, playback fails. I’m running PMS on an ASUSTOR 5402T. - Verified filesystem permissions - Intro/credit detection works fine - Media libraries are updated to the new agents, metadata refreshed - No SQLite DB errors in the logs - Tried with both disabled and enabled hardware acceleration - _Not_ using a custom transcoder temporary directory I don’t know what else to try; thank you in advance! [Plex Media Server Logs\_2025-05-19\_14-34-12.zip](https://forums.plex.tv/uploads/short-url/59vSubf0VfuU6VdD2ldDLKBmZwJ.zip) (2.3 MB) ---
**Author:** ![Atomatth](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/atomatth/32/314355_2.png) [@Atomatth](https://forums.plex.tv/u/Atomatth)\ **Post date:** [May 19, 2025, 8:05pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/2 "2025-05-19T20:05:05Z")
Can you please update to the latest Beta and retest. There was a bug in the earlier Beta version that was causing the DB to expand. This may not be the root cause but lets at least remove it from the equation. > [@Plex Media Server](https://forums.plex.tv/t/plex-media-server/30447/675): > > Plex Media Server 1.41.7.9799 is now available to Plex Pass users in the Beta update channel. NEW: (TerraMaster) Add ARMv8 platform support (PM-2349) (Web) Updated to 4.146.0 FIXES: (Agents) Requests to legacy agents routes would fail (PM-3385) (Continue Watching) Always return ancestor guids for in-progress items (PM-3303) (Filters) The DOVI filter would result in an error when applied to a show library (PM-3272) (Optimization) Conversion queue would stall after a single item (PM-3372) (T… Also seeing Errors calling out a possible double NAT environment. Please check out this [support article](https://support.plex.tv/articles/200931138-troubleshooting-remote-access/#toc-3) for some possible assistance: ---
**Author:** ![wipeout630](https://avatars.discourse-cdn.com/v4/letter/w/e274bd/32.png) [@wipeout630](https://forums.plex.tv/u/wipeout630)\ **Post date:** [May 19, 2025, 8:29pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/3 "2025-05-19T20:29:43Z")
Updated using the beta release channel. Transcoder still failed, new set of logs attached. I’m aware of the double NAT, it’s not a major concern right now. [Plex Media Server Logs\_2025-05-19\_15-27-03.zip](https://forums.plex.tv/uploads/short-url/pqkZlIqVLDTOfxLJnSgIVQ9N3XA.zip) (2.0 MB) ---
**Author:** ![PIPXIll](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@PIPXIll](https://forums.plex.tv/u/PIPXIll)\ **Post date:** [May 19, 2025, 11:06pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/4 "2025-05-19T23:06:20Z")
Just wanted to chime in, I took an having the issue with the transcoding sub error like you described. But my server is hosted on a windows 11 pro system. Also worth note: I am not, and never was on beta. This issue also only started this weekend for me. It happens no matter the device I playback from or if it’s LAN or WAN playback ---
**Author:** ![wipeout630](https://avatars.discourse-cdn.com/v4/letter/w/e274bd/32.png) [@wipeout630](https://forums.plex.tv/u/wipeout630)\ **Post date:** [May 21, 2025, 6:54pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/5 "2025-05-21T18:54:37Z")
Any other ideas? ---
**Author:** ![Atomatth](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/atomatth/32/314355_2.png) [@Atomatth](https://forums.plex.tv/u/Atomatth)\ **Post date:** [May 21, 2025, 7:14pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/6 "2025-05-21T19:14:40Z")
@PIPXIll you’ll need to share you [PMS logs.](https://support.plex.tv/articles/200250417-plex-media-server-log-files/) Make sure to enable [Debug logging](https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/#toc-1). @wipeout630 Still investigating. This does initially appear to be networking related as previous users with the same Error message reported was identified as having a bad network configuration (reverse proxy). I would advise to resolve the double NAT issue and see if the issue is resolved. Will continue investigating. Also, make sure to install the latest update, which is currently **1.41.7.9799**. ---
**Author:** ![PIPXIll](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@PIPXIll](https://forums.plex.tv/u/PIPXIll)\ **Post date:** [May 22, 2025, 8:24pm UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/7 "2025-05-22T20:24:30Z")
@Atomatth Here they are. hope this helps fix things up for anyone dealing with the issue. [Plex Media Server Logs\_2025-05-22\_15-21-45.zip](https://forums.plex.tv/uploads/short-url/iu9zlllWMnyWoA1ByrHnPINcnzM.zip) (4.7 MB) ---
**Author:** ![wipeout630](https://avatars.discourse-cdn.com/v4/letter/w/e274bd/32.png) [@wipeout630](https://forums.plex.tv/u/wipeout630)\ **Post date:** [May 28, 2025, 2:59am UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/8 "2025-05-28T02:59:21Z")
I resolved the double NAT and confirmed PMS is fully available outside my network. Transcoding still failed. New set of logs attached but still shows the same error: “Error configuring transcoder: TPU: Failed to download sub-stream to temporary file” I updated PMS to 1.41.7.9823. [Plex Media Server Logs\_2025-05-27\_21-55-25.zip](https://forums.plex.tv/uploads/short-url/lRB7ebBaByecJO8IG0ORucLCuVe.zip) (1.0 MB) ---
**Author:** ![wipeout630](https://avatars.discourse-cdn.com/v4/letter/w/e274bd/32.png) [@wipeout630](https://forums.plex.tv/u/wipeout630)\ **Post date:** [May 28, 2025, 3:08am UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/9 "2025-05-28T03:08:52Z")
I think I figured it out! By default, PMS is searching for subtitles instead of using the local files. I manually uploaded the .srt file to the episode and it started transcoding and playback worked perfectly. I need to disable the default web search, it was pulling a bad file. Secondly, I need to fix the local .srt file naming convention. I’m also adding [OpenSubtitles.org](http://OpenSubtitles.org) as a fallback. ---
**Author:** ![system](https://global.discourse-cdn.com/plex/original/3X/2/a/2acb9765406f63293d357b4ec509ec39aa28f2ad.png) [@system](https://forums.plex.tv/u/system)\ **Post date:** [August 26, 2025, 3:09am UTC](https://forums.plex.tv/t/transcoding-fails-when-subtitle-track-is-selected/919252/10 "2025-08-26T03:09:26Z")
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