SOLVED: Docker Container - Playback failed due to a fatal playback error

[pennywise134]

Yes. You are using a browser that reports av1 support but not hevc support (likely firefox) which caused server to transcode to av1 and that is the problem because your hardware does not have av1 hardware encoder. With that disabled the server will transcode to h264 instead.
[/quote]

I unchecked the "Allow encoding in AV1 format" box, and I'm still getting the fatal error. Any thoughts?

I attached the ffmpeg log, let me know if there are any other log files I should gather.

Also, here are the contents of my docker-compose.yml file:

version: '3.8'
services:
  jellyfin:
    image: jellyfin/jellyfin
    container_name: jellyfin
    restart: unless-stopped
    network_mode: "host"
    volumes:
      - ./configconfig
      - ./cachecache
      - /media/lucas/GOLDmedia
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=America/Toronto