SOLVED: ASS subtitles stopped working on Android TV client

[SquishySquash]

Specific file plays fine on my computer with i.e VLC player. It also plays fine on Jellyfin using webclient. Only while attempting to play file either from mobile Android app or Android TV app it fails with "source error"

FFmpeg, logs and mediainfo logs in post below as requested

[TheDreadPirate]

What are your hardware specs? And can you share your full Jellyfin log (not ffmpeg log) via pastebin?

[SquishySquash]

What are your hardware specs?  And can you share your full Jellyfin log (not ffmpeg log) via pastebin?

Jellyfin server is running via docker (container manager) on Synology NAS DS423+ ( Intel Celeron J4125 quick-sync capable CPU), my compose is:

Code:

version: '3.5'
services:
  jellyfin:
    image: jellyfin/jellyfin:latest
    container_name: jellyfin
    network_mode: host
    volumes:
      - /volume2/docker/jellyfin/config:/config
      - /volume2/docker/jellyfin/cache:/cache
      - /volume2/docker/jellyfin/logs:/logs
      - /volume1/Data/Media:/media
    restart: 'unless-stopped'
    environment:
      TZ: Europe/Warsaw
    devices:
      - /dev/dri/renderD128:/dev/dri/renderD128
      - /dev/dri/card0:/dev/dri/card0

TV with Google TV OS, Android 11, Android Client version 0.18.3, Jellyfin Server 10.10.3

[SquishySquash]

I also discovered that media files that previously played without any issue also throw that error. And I haven't changed anything in my setup in meantime. So it means that something broke on its own and now Jellyfin has issues playing media with ASS subtitles.

Below are logs:

main jellyfin log from playing back two different files https://pastebin.com/C1w9YPmp
ffmpeg log from 1st file (failure) https://pastebin.com/C0mGWupi
ffmpeg log from 1st file (sucess - ASS subs disabled) https://pastebin.com/mZrVV3V7
mediainfo https://justpaste.it/fs7ee

ffmpeg log from 2st file (used to work before) (failure) https://pastebin.com/wwpg2rpR
ffmpeg log from 2st file (used to work before) (sucess - ASS subs disabled) https://pastebin.com/0HAw6H0h
mediainfo from 2nd file https://justpaste.it/f8iat

[TheDreadPirate]

The container isn't able to use the GPU. Try switching the device passthrough to just "/dev/dridev/dri".

[SquishySquash]

The container isn't able to use the GPU.  Try switching the device passthrough to just "/dev/dridev/dri".

Thank you, I removed D128 line from compose and changed other line just to /dev/dri and now it works again. Do you have any idea why it used work normally for weeks and just now it suddenly started causing problems?

[TheDreadPirate]

I have no idea. DSM/dockerd software update? I've seen this a few times and I have no idea why it makes a difference when the device passed in is ultimately the same.