Adds the spike write-up and re-opens finding 2 of playback-backend-unification.md, which concluded that video cannot unify on a native engine because the webview owns the surface. That finding's general form has since been falsified on Android, where native video composites behind a transparent WebView and ships on by default. The evidence behind it was also entirely about foreign-window embedding -- mpv's render API, drawing into a GL context we own inside Tauri's own GTK tree, was never tested. The spike tests that one claim and comes back green on Linux for both X11 and Wayland, bar the Tauri default_vbox() half of G1. Findings 3-6 are deliberately left standing. Finding 3 in particular -- mpv has no adaptive bitrate -- is an independent disqualifier that a green compositing result does not clear, and the spike says so rather than reading as a green light. The next-free-id line moves to UR-079 / IR-033 / DR-219: this branch allocated UR-077 and UR-078 for the updater and diagnostics work, and DR-215 through DR-218 with them, after that line was last written. Authored in a parallel session working in the same checkout; committed here so it travels with the rest of the branch.

JellyTau
A cross-platform Jellyfin client built with Tauri, SvelteKit, and TypeScript.
Business logic lives in a Rust backend; a UI-rich Svelte frontend handles presentation and talks to it over Tauri's IPC. Targets Linux (libmpv) and Android (ExoPlayer).
Getting Started
This project uses bun as its package manager.
# Activate the Rust environment (fish shell)
source "$HOME/.cargo/env.fish"
# Install dependencies
bun install
# Run in development
bun run tauri dev
# Type-check the frontend
bun run check
# Build for Linux
bun run tauri build
# Build for Android
bun run tauri android build
For the full set of build, test, and Android helper scripts, see scripts/README.md.
Documentation
| Topic | Location |
|---|---|
| Architecture overview & subsystem docs | docs/architecture/ |
| Requirements, traceability & technical debt | docs/requirements.md |
| Build & release process | docs/build/build-release.md |
| Docker builds | docs/build/docker.md |
| Traceability tooling & CI | docs/traceability.md, docs/traceability-ci.md |
| Release checklist | docs/release-checklist.md |
| UX flows | docs/ux-flows.md |
| CI operations (builder image, secrets, runner) | docs/build/ci-operations.md |
Contributing
CONTRIBUTING.md covers the setup, the gates a change has to pass, and the two rules that catch people out (bug fixes start with a failing test; Jellyfin's taxonomy stays in Rust). Please also read the Code of Conduct.
Found a security problem? Do not open an issue — see SECURITY.md.
Verifying a download
Every release publishes SHA256SUMS covering all of its artifacts, plus an SBOM
of what went into the build:
sha256sum -c SHA256SUMS
Desktop builds update themselves from Settings → Updates, verifying each payload against JellyTau's signing key before installing. Android installs are handled by the system installer, so the app links to the releases page instead.
Recommended IDE Setup
VS Code + Svelte + Tauri + rust-analyzer.
License
MIT