Docker transcoding error, not otherwise specified

Server Version#: 1.15.2.793-782228f99
Player Version#: Unknown (web-app + Chromecast)
I’m severely struggling in trying to debug a very generic and unspecified “Conversion failed. Transcoder exited because of an error” (I translated from Italian) a brand new Ubuntu box.
I’m running with docker-compose, here the relevant bit of the compose file:

  plex:
    container_name: plex
    environment:
      - "TZ=Europe/Rome"
      - "PLEX_CLAIM=${PLEX_CLAIM}"
      - "CHANGE_CONFIG_DIR_OWNERSHIP=true"
      - "ADVERTISE_IP=http://<IP>:32400/"
      - "ALLOWED_NETWORKS=10.0.0.0/16"
    hostname: "sagittarius"
    image: plexinc/pms-docker:plexpass
    ports:
      - 3005:3005/tcp
      - 8324:8324/tcp
      - 32400:32400/tcp
      - 32469:32469/tcp
      - 1900:1900/udp
      - 32410:32410/udp
      - 32412:32412/udp
      - 32413:32413/udp
      - 32414:32414/udp
      - 33400:33400/tcp
      - 33443:33443/tcp
    restart: unless-stopped
    volumes:
    - "/cephfs/Media:/data:ro"
    - "plex_data:/config"
    - "/tmp:/transcode"

Logs are extremely generic, even with DEBUG enabled:

Mar 26, 2019 23:17:49.938 [0x7f7a437fe700] DEBUG - Job running: EAE_ROOT='/tmp/pms-e8f2e2b0-6d14-4743-aacb-86290ebe849f/EasyAudioEncoder' FFMPEG_EXTERNAL_LIBS='/config/Library/Application\ Support/Plex\ Media\ Server/Codecs/a22632d-2132-linux-x86_64/' XDG_CACHE_HOME='/config/Library/Application Support/Plex Media Server/Cache' XDG_DATA_HOME='/usr/lib/plexmediaserver/Resources' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/usr/lib/plexmediaserver/Plex Transcoder' '-codec:0' 'h264' '-codec:1' 'ac3' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/data/Movies/Movie (2018) [Travis Knight]/Movie (2018) [1080p x264 - 5.1 AC3 Eng - BluRay].mkv' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/transcode/Transcode/Sessions/plex-transcode-oqafk0g3eex6yhjzjild9xwt-059a00ce-24cb-432b-b3c0-bf5419833210/temp-0.srt' '-filter_complex' '[0:0]scale=w=720:h=406[0];[0]format=pix_fmts=yuv420p|nv12[1]' '-filter_complex' '[0:1] aresample=async=1:ocl='\''stereo'\'':osr=48000[2]' '-map' '[1]' '-metadata:s:0' 'language=eng' '-codec:0' 'libx264' '-crf:0' '21' '-maxrate:0' '1724k' '-bufsize:0' '3448k' '-r:0' '23.975999999999999' '-preset:0' 'veryfast' '-x264opts:0' 'subme=2:me_range=4:rc_lookahead=20:me=hex' '-force_key_frames:0' 'expr:gte(t,0+n_forced*8)' '-map' '[2]' '-metadata:s:1' 'language=eng' '-codec:1' 'aac' '-b:1' '162k' '-f' 'dash' '-min_seg_duration' '8000000' '-skip_to_segment' '1' '-time_delta' '0.0625' '-manifest_name' 'http://127.0.0.1:32400/video/:/transcode/session/oqafk0g3eex6yhjzjild9xwt/059a00ce-24cb-432b-b3c0-bf5419833210/manifest' '-avoid_negative_ts' 'disabled' '-map_metadata' '-1' '-map_chapters' '-1' 'dash' '-map' '1:s:0' '-metadata:s:0' 'language=eng' '-codec:0' 'ass' '-f' 'segment' '-segment_format' 'ass' '-segment_time' '1' '-segment_header_filename' 'sub-header' '-segment_start_number' '0' '-segment_list' 'http://127.0.0.1:32400/video/:/transcode/session/oqafk0g3eex6yhjzjild9xwt/059a00ce-24cb-432b-b3c0-bf5419833210/seglist?stream=subtitles' '-segment_list_type' 'csv' '-segment_list_size' '2147483647' '-segment_list_separate_stream_times' '1' '-segment_format_options' 'ignore_readorder=1' 'sub-chunk-%05d' '-start_at_zero' '-copyts' '-vsync' 'cfr' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/oqafk0g3eex6yhjzjild9xwt/059a00ce-24cb-432b-b3c0-bf5419833210/progress'
Mar 26, 2019 23:17:49.939 [0x7f7a437fe700] DEBUG - Jobs: Starting child process with pid 490
Mar 26, 2019 23:17:49.950 [0x7f7a772f2700] VERBOSE - JobManager: child process with handle 490 exited
Mar 26, 2019 23:17:49.950 [0x7f7a772f2700] DEBUG - Jobs: '/usr/lib/plexmediaserver/Plex Transcoder' exit code for process 490 is 1 (failure)
Mar 26, 2019 23:17:49.950 [0x7f7a76af1700] DEBUG - Streaming Resource: Terminating session 0x7f7a1c022120:mgiawndkaiatn79f2z4oskel which is using transcoder slot.  Used slots is now 0

I’m stumped, I even have a lifetime pass and can’t manage to see a simple video.
Please help.

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