- Reduce debounce delay from 700ms to 400ms for faster response
- Add 1.5s cooldown after emitting FINAL to prevent duplicate triggers
that cause LLM abort/retry cycles
- Enable speaker diarization (enable_diarization=True)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The LiveKit framework never sends FlushSentinel to the STT stream.
Instead it pushes silence frames and waits for FINAL_TRANSCRIPT events.
In EXTERNAL turn-detection mode, Speechmatics only emits partials.
New approach: each partial transcript restarts a 700ms debounce timer.
When partials stop (user stops speaking), the timer fires and promotes
the last partial to FINAL_TRANSCRIPT, unblocking the pipeline.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Trace _patched_process_audio lifecycle and FlushSentinel handling
to diagnose why final transcripts are not being promoted.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
VoiceAgentClient.finalize() schedules an async task chain that often
loses the race against session teardown. Instead, intercept partial
segments as they arrive, stash them, and synchronously emit them as
FINAL_TRANSCRIPT when FlushSentinel fires.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Move the SpeechStream._process_audio patch from container runtime
into our own source code so it survives Docker rebuilds. The patch
adds client.finalize() on FlushSentinel so EXTERNAL mode produces
final transcripts when LiveKit's VAD detects end of speech.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
EXTERNAL mode produces partial transcripts but livekit-plugins-speechmatics
does not call finalize() when receiving a flush sentinel from the framework.
A runtime monkey-patch on the plugin's SpeechStream._process_audio adds the
missing finalize() call so final transcripts are generated.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Speechmatics handles end-of-utterance natively via its Voice Agent
API (ADAPTIVE mode). Use turn_detection="stt" on AgentSession so
LiveKit delegates turn boundaries to the STT engine instead of
conflicting with its own VAD-based turn detection.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
ADAPTIVE mode enables a second client-side Silero VAD inside the
Speechmatics SDK that conflicts with LiveKit's own VAD pipeline,
causing no transcription to be returned. EXTERNAL mode delegates
turn detection to LiveKit.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
LiveKit's LanguageCode class normalizes ISO 639-3 codes to ISO 639-1
(cmn → zh), but Speechmatics API expects "cmn" not "zh". Override
the internal _stt_options.language after construction.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
hailin