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The relay forwards the node's fragments untouched, and those begin at zero
at the seek point. The player never notices because its SourceBuffer is given
`timestampOffset = start`; a receiver has no equivalent, so the cues are
shifted by `-start` before they leave, recomputed at every restart of the
relay. Sent as they are, a subtitle would be out by the whole seek.
The document is served from the relay's own port at /subs.vtt, behind the same
token as the stream and with CORS: a receiver fetches a side-loaded track with
XHR from its own origin, and without the headers it fails as a network error
with nothing on screen to say so. The URL carries a version because a track is
cached by address — changing the cues behind a fixed URL leaves the previous
language showing.
Cues that end before the stream begins are dropped rather than clamped, so a
line from before the seek cannot appear over the first frames after it.
The relay is plain Node, so the tests start it and fetch from it rather than
reading its source.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc
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Re-serve decrypted fMP4 video over HTTP on the LAN so a Chromecast can
play the stream. The relay runs in the Electron main process — same trust
boundary as downloads and MSE playback.
- cast-relay.js: HTTP server with BoxAccumulator (reassembles WebRTC
chunks into moof+mdat pairs), ring buffer, backpressure, finish() for
clean end-of-stream, fixed port range 19550-19553
- cast-chromecast.js: mDNS discovery (bonjour-service) + CASTV2 protocol
(castv2-client), connect/reload/disconnect lifecycle
- Seek-aware: relay restarts on every seek, Chromecast reloads new URL;
generation counter prevents stale async errors from killing active
restarts; landingPlayheadRef suppresses programmatic seeking events
- Device picker in video top bar with scan, device selection, copy-URL
fallback, and cast status indicator
- IPC bridge (main/preload/platform) for start/push/stop/finish/status/
discover/chromecastConnect/chromecastReload/chromecastDisconnect
- Phase 3 design doc for DLNA/Smart TV in docs/cast-smart-tv.md
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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