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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.
Specs index
Feature specs for JellyTau. Start a new one from SPEC-TEMPLATE.md and run it past SPEC-REVIEW-CHECKLIST.md before accepting it.
What lives here
Only work that has not shipped. Once a spec is fully implemented its design is folded into the architecture docs — which are the maintained description of the build — and the spec file is deleted. Git history keeps the original, including its rejected alternatives and acceptance criteria; the architecture docs keep the reasoning that a future change still needs.
So: a file in this directory is a promise, not a description. If you want to know how something works, read docs/architecture/. If you want to know what is planned, read here.
Status vocabulary
| Status | Meaning |
|---|---|
| Proposed | Written, not accepted. Nothing built. |
| Accepted | Agreed as the design; implementation not started or not finished. |
| Partially implemented | Some parts shipped; the spec names what is left. |
| Design authority | No code of its own — it records a decision later specs act on. |
Next free requirement ids (always re-check requirements.md before allocating): UR-086, IR-036, JA-038, DR-295, UT-264 (DR-289/290 went to the v0.12.2 download fixes; DR-291/292 and UT-255/257/258 to the offline-banner and server-only-reveal work; DR-293/294 and UT-259-263 to Android's FFmpeg decoding and offline-without-network). Three specs below suggested ids that have since been taken by other work; each carries a ⚠️ note at the top — this line was itself stale by five, two and forty-seven until 2026-09-08, which is why the re-check is not optional.
Partially implemented
| Spec | What landed | What is left |
|---|---|---|
| frontend-domain-model.md | Catalog surface: MediaKind, from_jellyfin isolated, ticks → ms |
primaryImageTag → imageId (~30 sites); player/session/reporting tick math; stream.type |
| jellyfin-server-version-compatibility.md | Route table, ServerCapabilities, the auth-spelling fix (the one thing 12.0 actually breaks), explicit Recursive, cache generation stamping, the frontend route leak, the unsupported-server state, and an HTTP-level harness that runs the repository against both generations |
DR-283: two resolved flags are not consumed yet, and honours_directplay_audio_codec is unestablished for 12.x — both need a running 12.x server. Nothing has been tested against a real server of either generation |
| libmpv2-migration.md | LICENSE |
The libmpv → libmpv2 crate swap |
| read-through-media-cache.md | DR-126…128, DR-133…138 — cache entries are download rows; local playback of downloads | DR-122/124/125 — the read-through capture. DR-121 shipped as backend-owned stream selection and left this spec |
| scoped-search-boundary-implementation.md | Stage 1: SearchScope owned by Rust (DR-063…067) |
Stage 2: result-side grouping (GROUP_ITEM_TYPES still in searchScope.ts) |
Not started
| Spec | Blocked on / note |
|---|---|
| desktop-native-video.md | mpv draws video on every desktop platform, then the webview <video> path and hls.js are deleted. Converts a measured 7% direct-play rate toward Android's 85%. Stacked on backend-owned stream selection. |
| backend-owned-stream-selection.md | Rust owns direct-play-vs-transcode, transport and quality; players consume one StreamSelection. Partly built — StreamSelection, Transport and the .m3u8 sniff removal have landed. |
| build-provenance.md | build.rs is still bare. ⚠️ suggested id DR-093 is taken. |
| player-facade-enforcement.md | ~60 commands.player* sites still outside the facade; no lint rule. ⚠️ suggested id DR-095 is taken. |
| windows-native-audio-backend.md | Blocked on the libmpv2 swap. ⚠️ suggested id IR-030 is taken. |
| linux-native-video-spike.md | Spike run 2026-08-21: compositing works on Linux, X11 and Wayland. G1-G6 green bar the Tauri default_vbox() half of G1. The adaptive-bitrate question it was waiting on is answered: the server publishes one EXT-X-STREAM-INF, so there is no ladder for mpv to lose (DR-229). StreamSelection (DR-225) is the contract to consume. |
Design authority
| Spec | Role |
|---|---|
| playback-backend-unification.md | Why video cannot unify onto one native engine and audio can. The audio half has since shipped on Android; Windows has not. |
| scoped-search-boundary.md | The boundary design the check:boundary rule came from. Stage 1 built. |
| scoped-search.md | Superseded in part — its "frontend only, no Rust changes" decision is the leak the boundary spec reversed. UX still current. |
Where the shipped specs went
Sixteen specs were folded into the architecture docs and deleted (2026-08-21). Where to look for each:
| Shipped work | Now documented in |
|---|---|
| Account menu & global chrome | 02-svelte-frontend.md — App Shell and Chrome |
| Library mosaic | 02-svelte-frontend.md — Library Mosaic |
| Series current-episode navigation | 02-svelte-frontend.md — Series and Episode Navigation |
| Downloads as an offline library | 02-svelte-frontend.md — Downloaded Browse |
| Favourites browsing | 01-rust-backend.md — Favorites System |
| Streaming bitrate cap | 01-rust-backend.md — Streaming quality ladder |
| Locally-indexed search | 03-data-flow.md — Search Flow; 01-rust-backend.md — Background workers |
| Offline downloaded-only filter | 06-downloads-and-offline.md — Offline Catalog Visibility |
| Audio equalizer · Android audio settings parity | 05-platform-backends.md — Audio settings on ExoPlayer |
| Android native video spike | 05-platform-backends.md — Native Video Compositing |
| Video background audio | 05-platform-backends.md — Background Audio Handoff |
| Traceability gate repair | traceability-ci.md |
| Boundary tripwire hardening | scripts/check-frontend-boundary.sh (its header is the spec) |
| Original-file downloads & Android FFmpeg decoding (was on-device-audio-remux) | 05-platform-backends.md — Licensed audio codecs; 06-downloads-and-offline.md — What a Video Download Fetches, Offline Means No Network |
| Playback docs corrections · req-coverage script removal | Nothing to document — both were corrections that have been applied |