sync_replay_project/docs/ROADMAP.md

Roadmap

Backlog and epics, in order. Done work lives in git history. Check an item off by deleting it in the same commit as the code. Wire changes also edit PROTOCOL.md.

Backlog

1. Sync fixes.

   • Jumpy seek. Root cause: the media_kit seek bar calls player.seek continuously while dragging; the coordinator only notices through its 1 s position poll (_detectUserSeek), so it fights the server echo and the seek-landed retry (_checkSeekLanded).
   • End-of-file stall. The 4 s buffered gate cannot be met in the last 4 s of a file, the server never learns the duration, and there is no finished state. Add duration reporting and a finished state.
   • Tiny read-ahead. Our own pins (cache-secs=10, demuxer-readahead-secs=10 in playback_controller.dart) cap it; want about two minutes for large files.
   • Remote clock offset is not corrected: clients assume their clock equals the server's.
   • Stale-ready. A ready member who went stale (no reports for 15 s) should return to the ready set when reports resume; the client re-sends ready as a workaround (remove it then).
   • Ghost member after an unclean drop until dropAfter.

2. Rendering, then shaders. media_kit falls back to software rendering on the dev machine. Suspect Impeller on Linux against media_kit's GL texture path; investigate first, since shaders need hardware rendering and it may also cause the video freeze. Then shaders: per-viewer local setting using mpv glsl-shaders, shipping Anime4K presets (bloc97, MIT).

3. Windows build + CI. There is no Windows runner. Try ubuntu2610/flutter_build (LLVM-MinGW + Wine gen_snapshot) on the Linux runner, fallback a GitHub Actions mirror. The manifest needs per-platform URLs and release_publish.sh must handle a second platform. The updater's Windows apply path exists but is untested. The tarball's watch-together-server needs a Windows dart compile exe too. Desktop tests are not in CI either.

4. Jellyfin (epic, below).

5. Smaller items

   • Link conveniences: Ctrl+V pastes into the media field; a link swap in session updates the remembered media; show the open link with an open-in-browser button.
   • Time UI: remaining time, scrubber preview.
   • mpv / mpv.net shortcut parity.
   • Sounds: replace NoopSfxService (cues already fire). Candidates: Kenney Interface Sounds (CC0), ObsydianX Pack 1 (CC0), akx/Notifications (CC0); playback via flutter_soloud. Keep seek/pause/resume near silent.
   • Chaos suite: host drop 5 s / 30 s, viewer stall, 20-seek storm, long outage with cache exhaustion (tool/shaper.dart --kill-after); assert no OOM, no stuck session, drift recovers.
   • Chat history pane (today: activity log only).
   • Avatar caching: serve avatar bytes once by hash instead of base64 in every state broadcast.
   • The state broadcast carries the full media URL, which can include an api_key.
   • TLS: document a reverse proxy in front of the server.
   • Playlist: queue-add, queue-skip, auto-advance like a swap.
   • Sidecar subtitles.

Epic: Jellyfin

• Each viewer logs in to Jellyfin themselves (Quick Connect or password).
• Several Jellyfin servers can be linked, keyed by ServerId.
• The sync server shares only {ServerId, ItemId}. Pasted Jellyfin links are recognised and reduced to that pair.
• Viewers with an account direct-play /Videos/{id}/stream?static=true with their own token and report Playing / Progress / Stopped, so watched state and Continue Watching update per account.
• Guests without an account play through the sync server, which fetches with a credential that stays server-side (the host's own or a configured one).
• Next episode: the successor in /Shows/{seriesId}/Episodes (NextUp means first unwatched, not next-after-X); audio and subtitle track matching by language, then title, then codec/channels.
• Library browser; anyone can put up items.

Spike facts (Jellyfin 10.11.11): /Videos/{id}/stream?static=true&mediaSourceId= serves the original with byte ranges (206). PlaybackInfo gives PlaySessionId and DirectPlay. All audio and subtitle tracks are embedded in the mkv. Quick Connect is enabled but /QuickConnect/Initiate returned 400: investigate (likely missing client/device fields in the auth header).

Deferred

P2P, Android. Never: transcoding, web clients.