---
type: issue
id: "0057"
status: open
created: 2026-07-28
milestone: M4
priority: medium
area: element
projekt: gitops
gitlab_iid: "11"
related: []
---
# Element Call: VP9 codec retry

> Adoptiert aus [gitops#11](https://git.lab/axion1337.chat/axion1337.chat-gitops/-/issues/11) (2026-08-18, ADR-0019). Kommentare und Verlauf bleiben dort; kanonisch ist ab jetzt diese Datei.

Retry `video_codec: vp9` for better compression efficiency than the current H.264. First attempt (2026-07-28) broke calls entirely (no audio/video transmitted). Likely cause: LiveKit uses SVC for vp9/av1 instead of classic simulcast, but the threadnet-call fork's `buildPublishOptions()` (`src/livekit/options.ts`) always builds simulcast-shaped `videoSimulcastLayers` regardless of codec. Needs a code fix (branch SVC vs simulcast config by codec) before retrying, plus a real browser-console repro if it fails again. H.264 is live and working well in the meantime (7/8 tracks native, 1 clean VP8 fallback).

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*Migriert aus Gitea `sorb/axion1337.chat-gitops#11` — dort erstellt am 2026-07-28 von sorb.*
<!-- gitea-migration: sorb/axion1337.chat-gitops#11 -->