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feat: Add 720p simulcast middle layer, note VP9/SVC incompatibility

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Default was only [180p, 360p] simulcast fallback layers - a big
quality cliff straight to blocky 360p on minor network hiccups instead
of gracefully stepping down from the 1440p top layer. Added a 720p
middle rung. Also documented the likely real reason forcing video_codec:
vp9 broke calls (2026-07-28): LiveKit uses SVC for vp9/av1, not classic
simulcast, but buildPublishOptions() always builds simulcast-shaped
layers regardless of codec - needs a code fix before retrying vp9.
This commit is contained in:
Thore Cimbal
2026-07-28 16:06:07 +02:00
parent f845d81e95
commit 7741180ae3
2 changed files with 14 additions and 4 deletions
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embedded/web/package.json
+1 -1
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@@ -1,6 +1,6 @@
{
"name": "@sorb/threadnet-call-embedded",
"version": "0.19.2-threadnet.1",
"version": "0.19.2-threadnet.3",
"files": [
"README.md",
"LICENSE-AGPL-3.0",
vite-embedded.config.ts
+13 -3
View File
@@ -31,13 +31,23 @@ export default defineConfig((env) =>
delayed_leave_event_delay_ms: 18000,
},
media_quality: {
// video_codec intentionally left unset (defaults to vp8) - setting it
// to "vp9" broke calls entirely in production (2026-07-28, no audio/video
// transmitted). Root cause not confirmed; revisit once isolated.
// video_codec intentionally left unset (defaults to vp8) - setting it to
// "vp9" broke calls entirely in production (2026-07-28, no audio/video
// transmitted). Likely cause: LiveKit uses SVC for vp9/av1 instead of
// classic simulcast, but buildPublishOptions() in src/livekit/options.ts
// always sets simulcast-shaped videoSimulcastLayers regardless of codec -
// needs a code fix in that function before vp9 can be retried safely.
video: {
max_resolution: 1440,
max_bitrate: 8_000_000,
max_framerate: 60,
// Without this, the code default is only [180p, 360p] - a huge quality
// cliff straight to blocky 360p on any minor network hiccup instead of
// gracefully stepping down. Added a 720p middle rung.
simulcast_layers: [
{ height: 180, bitrate: 150_000 },
{ height: 720, bitrate: 2_500_000 },
],
},
screen_share: {
max_resolution: 1440,