RTZR plugin for LiveKit Agents

Support for RTZR Streaming STT via WebSocket interface, following the "Streaming STT" guide in the RTZR Developers docs.

• Docs: https://developers.rtzr.ai/docs/en/ (see Streaming STT)

Installation

pip install livekit-plugins-rtzr

Prerequisites

Obtain client_id and client_secret from the RTZR Developers Console.

Set credentials as environment variables:

RTZR_CLIENT_ID=<your_client_id>
RTZR_CLIENT_SECRET=<your_client_secret>

# Override base HTTP API URL (used for token issuance)
RTZR_API_BASE=https://openapi.vito.ai

# Override WebSocket URL (used for live streaming)
RTZR_WEBSOCKET_URL=wss://openapi.vito.ai

If RTZR_WEBSOCKET_URL is not set, the plugin will derive it from RTZR_API_BASE by replacing the scheme with wss://.

Usage

Use RTZR STT in an AgentSession or as a standalone streaming service.

from livekit.agents import AgentSession
from livekit.plugins import rtzr

# Basic usage with env-based credentials
stt = rtzr.STT()

session = AgentSession(
    stt=stt,
    # ... llm, tts, etc.
)

Keyword boosting (Streaming STT only, sommers_ko model only):

stt = rtzr.STT(
    model="sommers_ko",
    keywords=[
        "키워드",
        ("부스팅", 3.5),
        "키위드:-1.0",
    ],
)

Rules:

• Use list entries as keyword or keyword:score, or use (keyword, score) tuples.
• Score must be between -5.0 and 5.0, up to 100 keywords, each <= 20 chars.
• Keywords must be written in Korean pronunciation (Hangul and spaces only); non-Korean input will error.

Notes:

• The WebSocket streaming endpoint accepts raw PCM frames when encoding=LINEAR16.
• The plugin relies on the server-side endpointing (EPD). You do not need to send finalize messages.
• When the pipeline closes the stream, the plugin sends EOS to end the session.