DR-245, first half. `LegacyPlayer` implements `MediaPlayer` over the existing
`PlayerBackend`, so engines not yet ported — ExoPlayer, the webview element,
the null backend — keep working while `PlayerController` moves across. Without
it the port would have to land all four engines at once.
It also makes the two designs comparable on one engine and one file. `open`
reproduces the old sequence faithfully: load, play, then seek for a start
position, with the seek's failure ignored exactly as callers used to ignore
it. Making it pass would defeat the point.
Running both engines over the same media is more informative than expected:
MpvPlayer 9/9
LegacyPlayer 8/9 - transport_settings_round_trip fails
Two things fall out of that. The start-position case now passes on *both*,
because DR-241 was fixed inside MpvBackend rather than only in the new engine
— so the suite confirms that fix independently, on a path it was not written
against. And the one genuine failure is a capability gap rather than a bug:
the old trait has no mute and no playback rate, so `LegacyPlayer` reports them
unsupported instead of folding mute into volume and losing the user's level.
That is the abstraction earning its keep on the first run: a missing
capability that was previously invisible is now a named, failing case.
The runner takes an engine argument:
player-conformance <media-file> [mpv|legacy]

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