DR-246. The strategy used to turn on `is_hls` and `use_html5`, decided in a command handler on behalf of engines it does not own. That is how "who renders" came to mean "how do I seek", and why a transcoded seek silently did nothing the moment native video changed the renderer (DR-238). Engines now declare `Capabilities::seeks_transcoded_in_place` — true for hls.js, which seeks within the VOD playlist it was handed and lets the server catch up; false for mpv, whose HLS demuxer cannot make the server transcode from a new offset. The command asks whichever engine is rendering. Adding an engine no longer means editing a shared truth table. The item's transport is not read at the seek site any more; the compiler flagged it unused, which is the URL-shape input finally disappearing. A deviation from the spec, recorded deliberately: it called for the engine to own the decision outright. It cannot. Re-negotiating a stream needs the repository, which sits above the engine, so the engine states the ability and the caller acts on it. That still removes the defect — nobody guesses on another component's behalf — without pretending an engine can reach upward. Also fixes a latent race in the conformance suite, found by running it: the seek case asserted immediately, which passes on an engine that records the target when it accepts a seek and races on one that waits for the decoder to move. `Harness::await_seek` polls instead, the way the Android suite already did. It failed with machine load rather than with the code, which is the kind of test that teaches people to re-run until green. MpvPlayer 9/9 LegacyPlayer 8/9 - still only the mute/rate gap in the old trait 789 tests, clippy -D warnings clean with and without the feature.

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