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Jellyfin Desktop hard-sets mpv's hwdec=auto-copy, whose probe list leaves out V4L2 M2M, and the Flatpak can't see the Frame's V4L2 decoder. An LD_PRELOAD shim (preloaded straight from the store, only that path exposed read-only) rewrites hwdec to v4l2m2m-copy,auto-copy; devices=all makes the decoder visible. Overrides via nix-flatpak, or a home-manager-owned override file without it.