53 lines
3.2 KiB
Markdown
53 lines
3.2 KiB
Markdown
# ECP-0123: Instant Station Guide and Player Warmup
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Status: Draft
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## Problem statement
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The hosted watch page can feel broken when `/api/public-streams` is slow, empty, or temporarily
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unreachable: the channel rail waits on the network before showing stations. Even after stations
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appear, the first channel tap pays the `@moq/watch` module import cost before the player element can
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mount. That increases time to first playing frame and makes channel selection feel unreliable.
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## Constraints
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- Keep the first screen a usable TV/player interface, not a marketing page.
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- Preserve manual tuning, share links, DVR mode, public station refresh, and existing relay fields.
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- Keep rollback simple: the live API remains authoritative after it answers.
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- Avoid Chrome-only transport assumptions and keep live playback failure messages actionable.
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- Keep the change static-site compatible so Cloudflare Worker asset deployment stays simple.
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## Decision
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Embed the current starter LA station guide in `index.html` and render it immediately on first load.
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Also keep a short-lived local guide cache, merge cached entries with the HTML seed, and refresh
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`/api/public-streams` in the background with a bounded timeout. A slow or empty refresh no longer
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clears already visible channels.
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Change the web client, publisher CLI/module defaults, runbook examples, and remote watch E2E default
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relay to `https://relay.every.channel/anon`. Default `wt-publish` and `nbc-wt-publish` to fMP4
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passthrough so hotpatch-launched publishers emit the `timescale` and `trackId` CMAF catalog metadata
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expected by the hosted `@moq/watch` element. Preload/preconnect the primary player dependencies and
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warm the `@moq/watch` custom element after first paint. Let `@moq/watch` use its available live
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transport fallback instead of forcing WebTransport-only playback. Add client performance marks for
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guide first render, guide fetch, watch request, player module readiness, player mount, catalog/live
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status, and first observable canvas frame when the browser exposes it.
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## Alternatives considered
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- Wait only for `/api/public-streams`. Rejected because the UI becomes blank when the directory is
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slow and because children should be able to tap visible channels immediately.
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- Make the API response cacheable at the CDN. Rejected as the only fix because active streams are
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short TTL and stale-but-visible fallback belongs in the client.
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- Bundle `@moq/watch` into the static site. Deferred because CDN import fallback is already in use;
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warming and modulepreload reduce tap latency without changing the build graph.
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## Rollout / teardown plan
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Ship the static web change with the existing Worker asset deploy and roll the publisher hotpatch
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binary to the LA nodes so their catalogs match the current watcher schema. Validate with clean-cache
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desktop/mobile browser loads and check the app's `window.__ecPerf` marks plus a live tune through the
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public relay. The Forgejo workflows use the locally registered `namespace-profile-linux-medium`
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runner label so the Cloudflare deploy can actually leave the queue on the self-hosted forge.
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Teardown is removing the HTML seed/cache/warmup path, returning to live-API-only station rendering,
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and explicitly passing `--passthrough=false` only if an older watcher path is restored.
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