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mpv now decodes video on Linux, drawn into a framebuffer we own and blitted
into the default vbox's draw handler. Tauri's widget tree is untouched, so an
upgrade that assumes its own layout cannot invalidate this. Direct play means
the original file, hardware decoding, and no server transcode at all — where
previously every desktop video was re-encoded to h264 for the browser engine,
whatever the file actually was. Off by default: JELLYTAU_NATIVE_VIDEO=1.
That settles finding 2 of playback-backend-unification.md — "native video
cannot be composited with a Tauri webview" — by demonstration rather than
argument, on X11 and Wayland both.
Turning it on exposed nine defects, none of them mpv's. Each was the same
mistake in a different place: a capability written down as a compile-time fact
about the platform, or a state asserted instead of confirmed.
DR-238/246 a seek routed by the stream's container rather than by what the
engine could do with it - correct only while one player handled
those streams, silent the moment another did
DR-239 a property handled but never observed, so the play/pause button
waited for an event that could not arrive
DR-240 fullscreen expanding the document while the window stayed put
DR-241 a seek issued before the engine had a file, failed, and discarded
- which is why resume began at zero
DR-247 a Linux-only gate outliving the caller that made it Linux-only,
breaking the Android build outright
DR-250 a stop aimed at whichever renderer bookkeeping believed was in
charge, missing the one actually making sound
DR-251 a duration of zero believed, leaving the seek bar no scale
DR-252 a junk float converted to a Duration, panicking the backend the
instant a length-less stream appeared
So the MediaPlayer contract (DR-242 … DR-247): `open` carries a start position,
so no caller sequences load-then-seek and none can race an engine's load;
`seek` states a destination and leaves in-place-versus-re-open to the engine;
`snapshot` is one coherent read; and `Phase::Opening` names the window where
intent used to be lost. One conformance suite runs against every engine —
FakePlayer and mpv under cargo test, ExoPlayer instrumented on a device — so an
engine is either correct or visibly failing.
Two of the nine were introduced during this work and caught on hardware, not by
any suite: an over-broad capability that grouped ExoPlayer with mpv, and the
Duration panic. The suites test engines that behave. That is recorded in
docs/native-player-verification.md, which asks for the exact action sequences
that found them.
Verified: all automated gates, conformance (mpv 9/9, legacy 8/9 by design,
ExoPlayer 7/7 on device), and manual desktop and Android passes on real
hardware.
Known open and deliberately shipped: resume reads local progress and never the
server's; the background-audio handoff still declares a state swap it does not
confirm (the symptom is now impossible, the race is not); and `bun run
android:dev` builds an APK carrying the release application id, whose failure
message advises an uninstall that would destroy app data. Fix that last one
before anyone else builds for Android.
Squashed from worktree-linux-native-video, which keeps the per-defect history.
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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-079, IR-033, DR-232. Three specs below suggested ids that have since been taken by other work; each carries a ⚠️ note at the top.
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 |
| 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. |
| 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) |
| Playback docs corrections · req-coverage script removal | Nothing to document — both were corrections that have been applied |