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The Error loading configuration file: /config/config/encoding.xml message in Jellyfin 12.0 and 12.1 comes from the EncoderPreset xsi:nil line that 10.11 writes by default. The server starts, but transcoding falls back to defaults and QSV is gone. Jump to 12.2 before migrating, or change that line to auto.
Jellyfin 12.0 came out on 8 September 2026 and rewrites the database on startup, so there is no way back without a backup. In Docker, the safe path is to stop the container, copy /config, remove third-party plugins, change the tag to 12.0, migrate and run a full library scan.
Jellyfin is a GPL-2.0 media server that asks for no account and no subscription. You install it from the official compose file, which publishes port 8096 and mounts three separate volumes for configuration, cache and media. The stable release in August 2026 is 10.11.11, and hardware transcoding is included.
