Transcoder crashes after choosing subtittles (OLED55C7V-Z WebOS 3.8) (Last working PLEX Server version 1.17.0.1709)

Plex Media Server Logs_2020-06-19_10-53-20.zip (2.2 MB)

Server Version#: 1.19.4.2935
But really anything after 1.17.0.1709 (tested almost all versions)
Player Version#: WebOS 3.8 (PLEX app. version 2.2)

Hi,
This is very annoying, PLEX transcoder is crashing every time I start a movie with external subtitles.

When I start it in original quality without external subtitles or internal subtitles chosen - works fine
When TV is already forced to transcode, because of resolution forced (for example When I use 1080p resolution for local 4K files) and I choose external subtitles - starts fine, but constantly buffering for 4K HEVC videos -> 1080p transcoding
When I chose original quality, but subtitles are forcing server to transcode - it crashes

It started after 17.0.1710 (this is the last working version) and it was not fixed in any new version.

This is the problematic part:

Jun 19, 2020 10:40:10.390 [0x812443500] ERROR - [Transcoder] [segment @ 0x803a9e600] Failed to open segment list 'http://127.0.0.1:32400/video/:/transcode/session/m3k2zrzm6v0io1orw9opynk3/f338d0be-b704-4195-942f-e745a8b7a28d/seglist?X-Plex-Http-Pipeline=infinite'
Jun 19, 2020 10:40:10.390 [0x812443500] DEBUG - Transcoder segment range: 0 - 487 (487)
Jun 19, 2020 10:40:10.390 [0x813c30a00] ERROR - [Transcoder] av_interleaved_write_frame(): Broken pipe
Jun 19, 2020 10:40:10.390 [0x813c30a00] DEBUG - Transcoder segment range: 0 - 488 (487)
Jun 19, 2020 10:40:10.390 [0x813c30a00] ERROR - [Transcoder] Error writing trailer of chunk-%05d: Invalid argument
Jun 19, 2020 10:40:10.390 [0x813c30a00] DEBUG - Transcoder segment range: 0 - 488 (488)
Jun 19, 2020 10:40:10.391 [0x813c30a00] DEBUG - Transcoder segment range: 0 - 489 (488)
Jun 19, 2020 10:40:10.391 [0x812f49300] DEBUG - Transcoder segment range: 0 - 489 (489)
Jun 19, 2020 10:40:10.391 [0x812f49300] DEBUG - Transcoder segment range: 0 - 490 (489)
Jun 19, 2020 10:40:10.391 [0x812f49300] DEBUG - Transcoder segment range: 0 - 490 (490)
Jun 19, 2020 10:40:10.391 [0x812f49300] DEBUG - Transcoder segment range: 0 - 491 (490)
Jun 19, 2020 10:40:10.391 [0x812f49300] DEBUG - Transcoder segment range: 0 - 491 (491)
Jun 19, 2020 10:40:10.392 [0x812f49300] DEBUG - Transcoder segment range: 0 - 492 (491)
Jun 19, 2020 10:40:10.392 [0x812f49300] DEBUG - Transcoder segment range: 0 - 492 (492)
Jun 19, 2020 10:40:10.392 [0x812f49300] DEBUG - Transcoder segment range: 0 - 493 (492)
Jun 19, 2020 10:40:10.392 [0x80b2c3800] DEBUG - Jobs: '/usr/local/share/plexmediaserver-plexpass/Plex Transcoder' exit code for process 21114 is 1 (failure)
Jun 19, 2020 10:40:10.392 [0x81565d000] DEBUG - Notifying consumer that data is complete.
Jun 19, 2020 10:40:10.392 [0x80c63ef00] DEBUG - Killing job.
Jun 19, 2020 10:40:10.392 [0x80c63ef00] DEBUG - Signalling job ID 21114 with 9
Jun 19, 2020 10:40:10.392 [0x80c63ef00] DEBUG - Job was already killed, not killing again.
Jun 19, 2020 10:40:10.392 [0x80bbce100] DEBUG - [TranscodeOutputStream] Input processing thread exited after writing 41672 bytes, m_closed=0, m_endOfFileReached=1, session->isStopped()=0
Jun 19, 2020 10:40:10.392 [0x80c63ef00] DEBUG - Stopping transcode session m3k2zrzm6v0io1orw9opynk3
Jun 19, 2020 10:40:10.392 [0x80c63ea00] DEBUG - Cleaning directory for session m3k2zrzm6v0io1orw9opynk3 (/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-m3k2zrzm6v0io1orw9opynk3-f338d0be-b704-4195-942f-e745a8b7a28d)
Jun 19, 2020 10:40:10.392 [0x81565d000] DEBUG - Streaming Resource: Terminated session 0x8140bf9d8:28x8eg4rsj43rf6r1kw0j5lf with reason Conversion failed. The transcoder exited due to an error.
Jun 19, 2020 10:40:10.395 [0x80bbceb00] ERROR - Session 0x8140bf9d8 terminated
Jun 19, 2020 10:40:10.397 [0x80c63ef00] DEBUG - Transcoder: Cleaning old transcode directories.
Jun 19, 2020 10:40:10.398 [0x80c63ef00] DEBUG - Transcoder: Cleaning old transcode directory: "/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-m3k2zrzm6v0io1orw9opynk3-f338d0be-b704-4195-942f-e745a8b7a28d"

Please fix it!
It makes all the modern PLEX server versions unusable for me!

Update:
When downgraded server to version 1.16.0, also constant buffering issue with HEVC 4K transcode to 1080p dissapeared.

This is the best working version as for now for my LG WebOS TV, which is a shame, because it’s already one year old.

Bump!
Please respond

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