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STT transcript delay/stitch + TTS stutter in eu-central

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
42/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
python
Ambito
audio-video-rtc

Direzione di ricerca

Start with the supplied reproduction at practice.parlez.app and the reported livekit-agents and Speechmatics package versions. Observe the STT transcript events and their timing while reproducing the reported behavior; the issue does not identify a code file or test to start from. Done means identifying whether the delayed or merged transcript behavior is reproducible and what is causing it, or ruling out the agent as the source.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

bug
Bug Description

I've been seeing intermittent glitches in our voice AI app since Sep 13, 2026. It is hosted in eu-central (LiveKit Cloud hosted agent)

The major symptoms are :

  1. STT transcript display: sometimes words cannot show up one by one smoothly. Instead they "flash", then 1-2s later several words/sentences stitch together and appear as one block in the transcript UI. Sometimes 2-3 sentences merge into a single transcript entry.
  2. TTS: occasionally stalls mid-sentence for 1-2s, then resumes, this might be caused by the delay of incoming STT. The TTS audio also sometimes speeds up briefly, then back to normal.

I have spent a day isolating the cause.

  • No code or dependency changes on our side around Sep 13.
  • I have swapped different TTS and STT models, the symptoms are persistent.
  • Ran on different devices, in different frontend hosting env. The same symptom reproduced.
  • Ran the same agent code on a laptop, same symptoms reproduced.

All these point to something in LiveKit's agent, maybe text-stream layer. I wonder if there is known latency or delivery issues, or any recent changes that affect STT transcription event delivery timing.

SPECIFIC QUESTION — EU-CENTRAL
Our agent is deployed in eu-central. LiveKit had an incident in eu-central on Sep 5, 2026 (agent join latency, resolved same day). Our symptoms started Sep 13, a week later, we wanted to ask: is there any chance our project's eu-central agent instances have been affected by a related or follow-on issue since Sep 5.

Expected Behavior

The STT transcript should display word by word in the order of people speak.

Reproduction Steps
1. Open https://practice.parlez.app/. login with a gmail account.
2. click any card, and speak in French. the green transcript display what you said .
3. Speak for a few minutes, you will notice the words in green transcript flashes. Wait for a second to two, they stitch together as a whole sentence and display at once. It seems the words didn't arrive in the right order, then finally stitch together.
Operating System

iOS, Samsung, windows11

Models Used

STT: Speechmatics (language=fr, operating_point=STANDARD) - TTS: Google Cloud (WaveNet) - LLM: openAI "gpt-4o-mini"

Package Versions
livekit-agents                           1.5.8
livekit-api                              1.0.7
ivekit-plugins-google                   1.5.8
livekit-plugins-speechmatics             1.5.8
livekit-plugins-turn-detector            1.5.8
Session/Room/Call IDs

session ID, RM_YdQL9PFTtbaW

Proposed Solution
Additional Context

No response

Screenshots and Recordings

No response

Lingua principale
Python
Stelle
14.6k
Fork
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Merge medio
2g 6h
PR unite (30g)
153

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