SOLVED: Multitrack Audio Track Names Missing

[TheDreadPirate]

What is the output of ffprobe on that file?  Also, did you make these changes after you add the file to your library?  Did you rescan and replace all metadata after changing the titles?  I mirrored your ffmpeg command, added "FOSS Audio" to track 1, rescanned my test file, and it showed up in Jellyfin.

   

Code:

chris@rat-trap:/media/storage2/testMovies/Atomic Blonde$ ffprobe Atomic\ Blonde\ -\ \[FOSS\].mkv
ffprobe version 6.0.1-Jellyfin Copyright (c) 2007-2023 the FFmpeg developers
......
......
  Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 01:54:44.293000000
  Stream #0:1(eng): Audio: flac, 48000 Hz, 7.1, s32 (24 bit) (default)
    Metadata:
      title          : FOSS Audio
      ENCODER        : Lavc60.3.100 flac
      DURATION        : 01:54:44.298000000
  Stream #0:2(eng): Audio: vorbis, 48000 Hz, 5.1, fltp
    Metadata:
      title          : Surround 5.1
      ENCODER        : Lavc60.3.100 libvorbis
      DURATION        : 01:54:44.303000000
  Stream #0:3(eng): Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      title          : Stereo
      ENCODER        : Lavc60.3.100 libvorbis
      DURATION        : 01:54:44.324000000
  Stream #0:4(eng): Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      title          : Stereo
      ENCODER        : Lavc60.3.100 libvorbis
      DURATION        : 01:54:44.332000000
  Stream #0:5(eng): Subtitle: hdmv_pgs_subtitle
    Metadata:
      DURATION        : 01:48:19.827000000

Code:

ffmpeg -i Atomic\ Blonde\ -\ \[FOSS\].mkv -map 0 -codec copy -metadata:s:a:0 title="FOSS Audio" test.mkv