Detect the host's GPU vendor(s) via PCI sysfs (no lspci dependency) and
append vendor-matched encoding-package steps to the install plan:
Intel -> intel-media-driver + vpl-gpu-rt + intel-compute-runtime,
AMD -> mesa + libva-mesa-driver. NVIDIA NVENC ships with the driver's
own userspace, so nothing is added when a driver is loaded, and a
warning step (never an automatic kernel-driver install) when it isn't.
Without these packages Jellyfin installs fine and direct-plays fine,
but any client that needs a transcode fails instantly with the opaque
"FFmpeg exited with code 251" / "fatal playback error" pair.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
28allday
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