Plex player won’t play when turn on Subtitles

Server Version#: 1.20.3.3437
Player Version#: 8.7.3.21018
Tried to play all my movies with “srt” files which used to work all the times. After installed this latest version on my Windows10, none of my player devices work (iPhone, SmartTV, FireTV 1st gen &FireTV Cube). Playin from web browser OK.
Does anyone has this issue?
Error message: “an error occurred while attempting to play this video. Please check your connection and try again”.
But if I turn OFF Subtitles, then it worked right the way.

I have the same issue, but I get the error message “Conversion failed. The transcoder failed to start up.”
Happens for me since Windows Server Version# 1.20.2, but not before that with the same files! Playback works fine without subtitles (original quality, and transcoded).

Here is part of the log file:
Oct 20, 2020 09:01:07.403 [9492] DEBUG - [Transcode] Found session GUID of 21kl8eyp9vf8m4v0jwmotxn3 in session start.
Oct 20, 2020 09:01:07.407 [9492] DEBUG - [Transcode] TranscodeUniversalRequest: using augmented profile Microsoft Edge
Oct 20, 2020 09:01:07.407 [9492] DEBUG - [Transcode] Downloading document http://127.0.0.1:32400/library/metadata/9916?checkFiles=1&includeBandwidths=1&offset=-1&X-Plex-Incomplete-Segments=1&X-Plex-Session-Identifier=45kowxfmk7sogwolmel8pm1z
Oct 20, 2020 09:01:07.407 [9492] DEBUG - [Transcode] Auth: authenticated user 1 as ***
Oct 20, 2020 09:01:07.420 [9492] DEBUG - [Transcode] We’re going to try to auto-select an audio stream for account 1.
Oct 20, 2020 09:01:07.420 [9492] DEBUG - [Transcode] Selecting best audio stream for part ID 58526 (autoselect: 1 language: en)
Oct 20, 2020 09:01:07.420 [9492] DEBUG - [Transcode] We’re going to try to auto-select a subtitle.
Oct 20, 2020 09:01:07.420 [9492] DEBUG - [Transcode] Subtitles: Found a candidate subtitle language [eng] for a foreign film
Oct 20, 2020 09:01:07.420 [9492] DEBUG - [Transcode] Subtitles: Found a candidate subtitle that matches our forced / language preference. [eng] [0]. Reason [Prefer sidecar]
Oct 20, 2020 09:01:07.420 [9492] DEBUG - [Transcode] Audio Stream: 141455, Subtitle Stream: 141457
Oct 20, 2020 09:01:07.421 [9492] WARN - [Transcode] Denying access to transcode of key /library/metadata/9916 due to terminated session
Oct 20, 2020 09:01:07.421 [5856] DEBUG - Completed: [172.24.48.107:56916] 400 GET /video/:/transcode/universal/start.mpd?hasMDE=1&path=%2Flibrary%2Fmetadata%2F9916&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=1&subtitleSize=100&audioBoost=100&location=lan&addDebugOverlay=0&autoAdjustQuality=0&directStreamAudio=1&mediaBufferSize=102400&session=21kl8eyp9vf8m4v0jwmotxn3&subtitles=auto&Accept-Language=en (9 live) TLS GZIP 18ms 463 bytes (pipelined: 7)
Oct 20, 2020 09:01:07.472 [5856] DEBUG - Auth: authenticated user 1 as ***
Oct 20, 2020 09:01:07.472 [9492] DEBUG - Request: [172.24.48.107:56916 (Subnet)] GET /video/:/transcode/universal/decision?hasMDE=1&path=%2Flibrary%2Fmetadata%2F9916&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=0&subtitleSize=100&audioBoost=100&location=lan&session=239ic6h764h7njzljooescq6&subtitles=auto&Accept-Language=en (9 live) TLS GZIP Signed-in Token ()
Oct 20, 2020 09:01:07.472 [9492] DEBUG - [Transcode] Found session GUID of 239ic6h764h7njzljooescq6 in session start.
Oct 20, 2020 09:01:07.476 [9492] DEBUG - [Transcode] TranscodeUniversalRequest: using augmented profile Microsoft Edge
Oct 20, 2020 09:01:07.476 [9492] DEBUG - [Transcode] Downloading document http://127.0.0.1:32400/library/metadata/9916?includeBandwidths=1&offset=-1&X-Plex-Incomplete-Segments=1&X-Plex-Session-Identifier=45kowxfmk7sogwolmel8pm1z
Oct 20, 2020 09:01:07.476 [9492] DEBUG - [Transcode] Auth: authenticated user 1 as ***
Oct 20, 2020 09:01:07.486 [9492] DEBUG - [Transcode] We’re going to try to auto-select an audio stream for account 1.
Oct 20, 2020 09:01:07.486 [9492] DEBUG - [Transcode] Selecting best audio stream for part ID 58526 (autoselect: 1 language: en)
Oct 20, 2020 09:01:07.486 [9492] DEBUG - [Transcode] We’re going to try to auto-select a subtitle.
Oct 20, 2020 09:01:07.486 [9492] DEBUG - [Transcode] Subtitles: Found a candidate subtitle language [eng] for a foreign film
Oct 20, 2020 09:01:07.486 [9492] DEBUG - [Transcode] Subtitles: Found a candidate subtitle that matches our forced / language preference. [eng] [0]. Reason [Prefer sidecar]
Oct 20, 2020 09:01:07.486 [9492] DEBUG - [Transcode] Audio Stream: 141455, Subtitle Stream: 141457
Oct 20, 2020 09:01:07.488 [9492] DEBUG - [Transcode] Scaled up video bitrate to 5229Kbps based on 1.500000x fudge factor.
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: Selected protocol dash; container: mp4
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: analyzing media item 58491
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: E2 - Episode 2: Direct Play is disabled
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: E2 - Episode 2: media must be transcoded in order to use the dash protocol
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: E2 - Episode 2: no direct play video profile exists for http/mkv/h264
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: E2 - Episode 2: no direct play video profile exists for http/mkv/h264/aac
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: E2 - Episode 2: Direct Streaming is disabled, so video stream will be transcoded
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: E2 - Episode 2: no remuxable profile found, so video stream will be transcoded
Oct 20, 2020 09:01:07.489 [9492] DEBUG - [Transcode] MDE: Cannot direct stream video stream due to profile or setting limitations
Oct 20, 2020 09:01:07.490 [9492] DEBUG - [Transcode] Scaled up video bitrate to 5229Kbps based on 1.500000x fudge factor.
Oct 20, 2020 09:01:07.490 [9492] DEBUG - [Transcode] MDE: Spitting Image - S1 E2 - Episode 2: selected media 0 / 58491
Oct 20, 2020 09:01:07.491 [9492] DEBUG - [Transcode] Streaming Resource: Adding session 0xabdba8:45kowxfmk7sogwolmel8pm1z which is using transcoder slot. Used slots is now 1
Oct 20, 2020 09:01:07.491 [9492] DEBUG - [Transcode] Streaming Resource: Added session 0xabdba8:45kowxfmk7sogwolmel8pm1z
Oct 20, 2020 09:01:07.491 [9492] DEBUG - [Transcode] Streaming Resource: Reached Decision id=9916 codes=(General=1001,Direct play not available; Conversion OK. Direct Play=3000,App cannot direct play this item. Direct play is disabled. Transcode=1001,Direct play not available; Conversion OK.) media=(id=58491 part=(id=58526 decision=transcode container=mp4 protocol=dash streams=(Video=(id=141454 decision=transcode bitrate=5229 encoder=libx264 width=1280 height=720) Audio=(id=141455 decision=copy channels=2 rate=48000) Subtitle=(id=141457 decision=transcode bitrate=2147483647 encoder=ass languageCode=eng location=sidecar))))
Oct 20, 2020 09:01:07.494 [5852] DEBUG - Completed: [172.24.48.107:56916] 200 GET /video/:/transcode/universal/decision?hasMDE=1&path=%2Flibrary%2Fmetadata%2F9916&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=0&subtitleSize=100&audioBoost=100&location=lan&session=239ic6h764h7njzljooescq6&subtitles=auto&Accept-Language=en (9 live) TLS GZIP 21ms 1724 bytes (pipelined: 8)
Oct 20, 2020 09:01:07.566 [5852] DEBUG - Auth: authenticated user 1 as ***
Oct 20, 2020 09:01:07.567 [9492] DEBUG - Request: [172.24.48.107:56916 (Subnet)] GET /video/:/transcode/universal/start.mpd?hasMDE=1&path=%2Flibrary%2Fmetadata%2F9916&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=0&subtitleSize=100&audioBoost=100&location=lan&session=239ic6h764h7njzljooescq6&subtitles=auto&Accept-Language=en (9 live) TLS GZIP Signed-in Token (
)
Oct 20, 2020 09:01:07.567 [9492] DEBUG - [Transcode] Found session GUID of 239ic6h764h7njzljooescq6 in session start.
Oct 20, 2020 09:01:07.570 [9492] DEBUG - [Transcode] TranscodeUniversalRequest: using augmented profile Microsoft Edge
Oct 20, 2020 09:01:07.570 [9492] DEBUG - [Transcode] Downloading document http://127.0.0.1:32400/library/metadata/9916?checkFiles=1&includeBandwidths=1&offset=-1&X-Plex-Incomplete-Segments=1&X-Plex-Session-Identifier=45kowxfmk7sogwolmel8pm1z
Oct 20, 2020 09:01:07.571 [9492] DEBUG - [Transcode] Auth: authenticated user 1 as ***
Oct 20, 2020 09:01:07.584 [9492] DEBUG - [Transcode] We’re going to try to auto-select an audio stream for account 1.
Oct 20, 2020 09:01:07.584 [9492] DEBUG - [Transcode] Selecting best audio stream for part ID 58526 (autoselect: 1 language: en)
Oct 20, 2020 09:01:07.584 [9492] DEBUG - [Transcode] We’re going to try to auto-select a subtitle.
Oct 20, 2020 09:01:07.584 [9492] DEBUG - [Transcode] Subtitles: Found a candidate subtitle language [eng] for a foreign film
Oct 20, 2020 09:01:07.584 [9492] DEBUG - [Transcode] Subtitles: Found a candidate subtitle that matches our forced / language preference. [eng] [0]. Reason [Prefer sidecar]
Oct 20, 2020 09:01:07.584 [9492] DEBUG - [Transcode] Audio Stream: 141455, Subtitle Stream: 141457
Oct 20, 2020 09:01:07.585 [9492] DEBUG - [Transcode] Found session GUID of 239ic6h764h7njzljooescq6 in session start.
Oct 20, 2020 09:01:07.585 [9492] DEBUG - [Transcode] Cleaning directory for session 239ic6h764h7njzljooescq6 ()
Oct 20, 2020 09:01:07.587 [9492] DEBUG - [Transcode] Starting a transcode session 239ic6h764h7njzljooescq6 at offset -1.0 (state=3)
Oct 20, 2020 09:01:07.591 [9492] DEBUG - [Transcode] [Universal] Using local file path instead of URL: \172.24.48.10\video\Series\Spitting Image\Spitting Image Season 1\Spitting.Image.2020.S01E02.720p.BRTB.WEB-DL.AAC2.0.H.264-NTb.mkv
Oct 20, 2020 09:01:07.592 [9492] DEBUG - [Transcode] HTTP requesting GET http://127.0.0.1:32400/library/streams/141457?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx
Oct 20, 2020 09:01:07.605 [8344] DEBUG - Request: [127.0.0.1:57256 (Loopback)] GET /library/streams/141457 (10 live) GZIP Signed-in Token (***)
Oct 20, 2020 09:01:07.609 [8344] DEBUG - Calculated media file path for path [file://172.24.48.10/video/Series/Spitting%20Image/Spitting%20Image%20Season%201/Spitting.Image.2020.S01E02.720p.BRTB.WEB-DL.AAC2.0.H.264-NTb.en.srt]: [“172.24.48.10/video/Series/Spitting Image/Spitting Image Season 1/Spitting.Image.2020.S01E02.720p.BRTB.WEB-DL.AAC2.0.H.264-NTb.en.srt”]
Oct 20, 2020 09:01:07.610 [8344] ERROR - Couldn’t find the file to stream: 172.24.48.10\video\Series\Spitting Image\Spitting Image Season 1\Spitting.Image.2020.S01E02.720p.BRTB.WEB-DL.AAC2.0.H.264-NTb.en.srt
Oct 20, 2020 09:01:07.610 [5856] DEBUG - Completed: [127.0.0.1:57256] 404 GET /library/streams/141457 (10 live) GZIP 5ms 331 bytes
Oct 20, 2020 09:01:07.610 [9492] DEBUG - [Transcode] HTTP 404 response from GET http://127.0.0.1:32400/library/streams/141457?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx
Oct 20, 2020 09:01:07.610 [9492] ERROR - [Transcode] Error configuring transcoder: TPU: Failed to download sub-stream to temporary file
Oct 20, 2020 09:01:07.610 [9492] DEBUG - [Transcode] Streaming Resource: Terminating session 0xabdba8:45kowxfmk7sogwolmel8pm1z which is using transcoder slot. Used slots is now 0
Oct 20, 2020 09:01:07.611 [9492] DEBUG - [Transcode] Streaming Resource: Terminated session 0xabdba8:45kowxfmk7sogwolmel8pm1z with reason Conversion failed. The transcoder failed to start up.
Oct 20, 2020 09:01:07.611 [1760] DEBUG - [Transcode] Killing job.

I have the same problem With .srt files every file failed to play with message Transcoder failed to start Without the subs everything works fine It’s driving me nuts

Updated to the latest version 1.20.3.3483 now , It played the movies but didn’t show the subtitles at all (played from iPad).

Any updates on this? I can play SRT subtitles just fine on web browser but can’t play them through my Nvidia Shield TV. Thanks!

Can anyone at Plex help out with this issue? I too am experiencing the same. Thanks!

Issue resolved with latest Plex update.

Any updates on this?
I still have the same issue as above - can play SRT subtitles just fine on web browser but can’t play them through my Samsung Tizen TV App. Thanks!

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