SOLVED: TVHeadend: jellyfin-ffmpeg exits with 253

[TheDreadPirate]

Not sure why there is still a 401 error, but my theory is that since the docker bridge network was not in the "allowed networks" list in TVH and it was denied access. By switching to host networking, the container is running with the host's actual IP, 192.168.1.#, and that subnet IS on the allowed list.