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I believe the big selling-point for Plex is that it can stream content to every single device you own no matter where you are, which requires on-the-fly transco

I believe the big selling-point for Plex is that it can stream content to every single device you own no matter where you are, which requires on-the-fly transcoding. It's my understanding that the performance requirements for realtime transcoding necessitates something like an MKV or MP4 file, although I'm happy to be proven wrong by someone with more direct knowledge of the process.

Borealid 2y ago
The blu-rays contains m2ts files, which have the same video data in them as an mp4 container would (h264, usually, vc-1 sometimes). Remuxing them can be done a NUC-class CPU. Transcoding them requires hardware support to do in real time with today's hardware, but the hardware support is quite light - an AMD iGPU can chew through a 4K BDMV no problem, so long as the codecs on both the input and output side are supported for acceleration. Jellyfin tries to prefer Intel Quicksync for some reason but it works with other GPU accel too. The problem isn't the performance envelope, it's how poorly the code is implemented on the Jellyfin side: it's not reliable at starting and managing the concat process, and it forces a transcode to embed subtitles for no logical reason I can see.