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Locking the screen kept a video's audio playing whether or not the background-audio button was on. Reported as "audio only mode is always active even if not selected". The button (UR-040) was built for the WebView <video> path, where losing visibility kills the decode: it chose between handing off to a native audio stream and letting playback stop. Native video then became the default renderer (DR-188), and on that path playback runs through ExoPlayer inside a MediaSessionService -- a foreground media service whose entire purpose is to keep playing while the app is hidden. Nothing stopped it, and nothing in the codebase paused on background. So the button governed a handoff that no longer had a gap to bridge. There was no interruption to paper over, and a user who never touched it got background playback anyway. The gating made it self-concealing: MainActivity.onStop only dispatched 'jellytau-background' when backgroundAudioEnabled was already true. The one notification that the app had gone away was itself conditional on the setting, so with the button OFF nothing could react even in principle. onStop and onStart now fire unconditionally and carry the two facts only the activity knows -- whether the toggle is armed, and whether Android put the window into picture-in-picture. What to do about it is decided in Rust (player/background_policy.rs), because it depends on whether the item has a picture to lose: video + toggle off -> Pause video + toggle on -> HandOffToAudio music, either -> KeepPlaying (no picture to give up) picture-in-picture -> KeepPlaying (the window is still on screen) It takes no renderer parameter on purpose. Two renderers with two behaviours and one toggle reaching only one of them is what produced the defect; a rule that cannot see the renderer cannot reproduce it. Two failure modes are deliberate. A decision call that fails leaves playback alone rather than risking silence mid-listen. An event with no detail -- older Kotlin against newer JS -- reads as "armed, not PiP", degrading to the previous behaviour instead of pausing unexpectedly. Foregrounding resumes only what backgrounding paused: a video the user paused themselves before locking stays paused. Written test-first per CLAUDE.md. The stub encoded today's behaviour (nothing ever pauses) and failed exactly as reported -- `left: KeepPlaying, right: Pause` -- before the rule was implemented. Verified on a device, R8-minified, both directions: [player_background_action] video=true armed=false pip=false -> Pause [player_background_action] video=true armed=true pip=false -> HandOffToAudio UR-040 / DR-224 / UT-211.
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