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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
However, nyanmisaka has been working on upstreaming Jellyfin's ffmpeg version to 4.4 (https://github.com/jellyfin/jellyfin-ffmpeg/pull/70), which seems do be doing wonders on Apollo Lake (at least on my 918+, transcoding performance more than doubled or tripled even). If you feel comfortable, you could just grab the .deb for Debian Buster and install it inside the container until it gets merged into an upcoming Jellyfin version.
Since you mentioned PLEX: PLEX doesn't actually transcode 4K movies at 4K when tone mapping is enabled, but rather seems to downscale it to 1280p (see https://github.com/jellyfin/jellyfin/issues/5067).