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Android ships no AC-3, E-AC-3, DTS or TrueHD decoders; they are licensed codecs, present only where a vendor paid for them. The ROD2-W09 tablet has a vendor DTS decoder and no AC-3/E-AC-3 at all. So every film with Dolby audio was re-encoded by the server, for streaming and for download alike, and a transcoded download has no Content-Length and ignores Range: ~1 MB/s, restarting from byte zero on every network blip. ExoPlayer now carries Jellyfin's media3 FFmpeg audio decoder in extension mode ON (platform decoders first, FFmpeg for what they lack), and CodecDetector reports its codecs so the device profile and the download policy agree with what actually decodes. The download policy judges audio against the renderer that will play the file (renderer_can_decode_audio) instead of the webview's list, so Android downloads are always the direct copy — a 910 MB E-AC-3 5.1 episode downloaded in 94 s and played offline. The webview video path is removed on Android: it decodes none of these codecs, so a stored "native video off" would play every original-file download silent. Rust reports webview_video_fallback (false on Android, true only beside mpv native video on Linux); Settings offers the switch and the player honours it only then. Linux keeps the fallback and, with it, the server transcode for undecodable audio. The decoder is GPL-3.0; the distributed APK carries its terms and the source stays MIT (THIRD_PARTY_NOTICES.md). The on-device remux spec this replaces is folded into 05-platform-backends.md and deleted. DR-293, UT-259, UT-262.
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