Playback fails with external vobsub subtitles enabled

Plex Media Server Desktops & Laptops
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1

Server Version#: 1.40.5.8897 - Running on OSX 14.6.1 and a M2 Mac Mini
Player Version#: 4.136.0 Web Client - Chrome on Windows 11.

Update: Still exists in 1.41.0.8930

Plex_Subtitle_Logs.zip (6.0 KB)

Failure Mode:

  • On playback, when a player enable subtitles for videos with external vobsub the playback hangs and the logs show a failed with transcode error message at PMS.
  • Fails on both Web and Android Clients.
  • Fails also with the experimental PMS version for subtitle burnin performance.

Tested

  • These movies used to work in Plex last year.
  • I believe the subtitles are fine and verified that multiple movie files will play back with subtitles in:
    • Emby
    • Direct Movie Play w/ VLC on Windows and OSX

Experiments

  • Clearing and redownloading Codecs
  • A few different versions of Plex and different platforms (Synology and OSX).

Logs

Aug 21, 2024 20:49:05.671 [0x16f507000] Debug — Request: [127.0.0.1:49941 (Loopback)] PUT /video/:/transcode/session/0n93f5bnlzx9il7yjwqa5vms/a827ee92-55fa-4c68-b535-b16d29726545/progress?status=opening (9 live) #861 Signed-in Token (plexuser) (range: bytes=0-) 
Aug 21, 2024 20:49:05.671 [0x16f9f3000] Debug — Completed: [127.0.0.1:49941] 204 PUT /video/:/transcode/session/0n93f5bnlzx9il7yjwqa5vms/a827ee92-55fa-4c68-b535-b16d29726545/progress?status=opening (9 live) #861 0ms 203 bytes (pipelined: 9) (range: bytes=0-) 
Aug 21, 2024 20:49:05.671 [0x16f507000] Error — [Req#866/Transcode/0n93f5bnlzx9il7yjwqa5vms/a827ee92-55fa-4c68-b535-b16d29726545] [vobsub @ 0x13df08540] Unable to open /Users/plex/Library/Caches/PlexMediaServer/Transcode/Sessions/plex-transcode-0n93f5bnlzx9il7yjwqa5vms-a827ee92-55fa-4c68-b535-b16d29726545/temp-0.sub as MPEG subtitles
Aug 21, 2024 20:49:05.672 [0x16f507000] Error — [Req#86a/Transcode/0n93f5bnlzx9il7yjwqa5vms/a827ee92-55fa-4c68-b535-b16d29726545] /Users/plex/Library/Caches/PlexMediaServer/Transcode/Sessions/plex-transcode-0n93f5bnlzx9il7yjwqa5vms-a827ee92-55fa-4c68-b535-b16d29726545/temp-0.idx: No such file or directory
Aug 21, 2024 20:49:05.673 [0x16f8db000] Debug — Jobs: '/Applications/Plex Media Server.app/Contents/MacOS/Plex Transcoder' exit code for process 1285 is 1 (failure)
Aug 21, 2024 20:49:05.673 [0x170713000] Debug — Streaming Resource: Terminating session 0x110915518:wp37yjmtd3k07p8cenbuzix5 which is using transcoder slot.  Used slots is now 0
Aug 21, 2024 20:49:05.673 [0x16fb97000] Debug — [Req#809/Transcode] Using default transcode duration of 120 minutes
Aug 21, 2024 20:49:05.673 [0x16fb97000] Debug — [Req#809/Transcode] Started session successfully: 0n93f5bnlzx9il7yjwqa5vms
Aug 21, 2024 20:49:05.674 [0x170713000] Debug — Streaming Resource: Terminated session 0x110915518:wp37yjmtd3k07p8cenbuzix5 with reason Conversion failed. The transcoder exited due to an error.
Aug 21, 2024 20:49:05.674 [0x1709cf000] Debug — Killing job.

This feels similar to an issue that was automatically closed a while back, but the problem still happens to me:

1 Like
2

I just used Subtitle Edit and converted on VobSub to SRT and the playback works flawlessly. Looks like the problem is when the vobsob is a separate external file.

3

I just updated to Version 1.41.0.8911 and playback still fails. “Conversion failed. The transcoder exited due to an error.”

Similar errors in the logs:

Aug 25, 2024 13:43:21.995 [0x16dda3000] Error — [Req#5086/Transcode/hctrcx6ojj8yygoauv4hgpx2/8dd11b26-2751-4862-aff7-e97a23ada6d4] [vobsub @ 0x12ce07e20] Unable to open /Users/plex/Library/Caches/PlexMediaServer/Transcode/Sessions/plex-transcode-hctrcx6ojj8yygoauv4hgpx2-8dd11b26-2751-4862-aff7-e97a23ada6d4/temp-0.sub as MPEG subtitles
Aug 25, 2024 13:43:21.995 [0x16dd17000] Error — [Req#508a/Transcode/hctrcx6ojj8yygoauv4hgpx2/8dd11b26-2751-4862-aff7-e97a23ada6d4] /Users/plex/Library/Caches/PlexMediaServer/Transcode/Sessions/plex-transcode-hctrcx6ojj8yygoauv4hgpx2-8dd11b26-2751-4862-aff7-e97a23ada6d4/temp-0.idx: No such file or directory
4

1.41.0.8976 1.41.0.8992 are still broken - I’ve tried both keeping the vobsub files in the same directory and within a “subtitles” directory.

5

Updated to 1.41.2.9134 - problem still exists.

6

Am also having this issue; can provide logs if/when someone looks into this

7

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