pipecat-duplexjev

Audio end-of-turn detection for Pipecat, powered by DuplexJev. It listens to how the user speaks, not only what they say, and tells your bot whether the user is finished, still talking, just backchanneling ("mm-hmm") or asking you to wait. The same request can also return emotion, laughter / breathing / coughs / sighs and barge-in at no extra cost.

• Four turn states, not a yes/no. A backchannel or a "hold on" is not a reason to start talking.
• Hears beyond the transcript. Every answer is read from the audio as one constrained token of a speech LLM. Nothing is decoded and no STT is needed for the decision.
• More than turns, same forward pass. Ask for emotion, non-verbal sounds or your own multiple-choice questions. They come back in last_answers with the turn decision.
• ~55 ms on the server for a turn decision with DuplexJev-4B-Para on one GPU.
• Chinese and English.
• On the CoDeTT turn-taking benchmark (English, zero-shot), DuplexJev-32B-Turn scores 70.0, against 51.4 for Smart Turn v3. See the paper and the project page.

Tested with pipecat-ai 1.12.0. Maintained by Adventists.ai (AI降临派).

Getting the published turn-taking numbers. LiveKit eot-bench (English, false cut-offs at 300 ms): 20.0% for DuplexJev-32B-Para v1.2 with the agent's previous message, 23.5% audio only, vs 35.2% for Smart Turn v3.2. That needs DuplexJev-32B-Para v1.2 on your own GPU behind duplexjev gateway >= 0.6 (see Run the model yourself), the default readout="turn", and the agent's previous message (below). Since 2026-10-13 the free trial API serves the same DuplexJev-32B-Para v1.2, but it is rate limited (30 requests per minute) and served from mainland China: fine for trying the plugin, self-host for a live bot or a benchmark run.

Install

pip install pipecat-duplexjev

Use

Drop it in wherever Pipecat takes a turn analyzer (Pipecat >= 1.0):

from pipecat.processors.aggregators.llm_response_universal import LLMContextAggregatorPair, LLMUserAggregatorParams
from pipecat.turns.user_stop import TurnAnalyzerUserTurnStopStrategy
from pipecat.turns.user_turn_strategies import UserTurnStrategies
from pipecat_duplexjev import DuplexJevTurnAnalyzer

turn = DuplexJevTurnAnalyzer(
    url="http://localhost:8420",          # your own gateway; omit to use the free hosted trial API
    extra_questions=["emotion", "sound"],
    on_answers=lambda a: print({k: v["answer"] for k, v in a.items()}),
)

aggregators = LLMContextAggregatorPair(context, user_params=LLMUserAggregatorParams(
    vad_analyzer=SileroVADAnalyzer(),
    user_turn_strategies=UserTurnStrategies(stop=[TurnAnalyzerUserTurnStopStrategy(turn_analyzer=turn)]),
))

Give it the assistant's last message (new in 0.3.0). Turn-taking is clearly better when the model knows what the bot had just said (a question invites a short answer; "ok" after a question ends the turn). Put the tracker after your LLM service:

from pipecat_duplexjev import DuplexJevContextTracker

pipeline = Pipeline([transport.input(), stt, aggregators.user(), llm,
                     DuplexJevContextTracker(turn),       # tells the analyzer what the bot is saying
                     tts, transport.output(), aggregators.assistant()])

or call turn.set_assistant_said(text) yourself. It needs a gateway from duplexjev>=0.6. On LiveKit eot-bench (English, DuplexJev-32B-Para v1.2, full run) this cuts false cut-offs at a 300 ms budget from 23.5% to 20.0%.

A complete snippet is in examples/wiring.py. examples/live_check.py feeds real clips through the analyzer, frame by frame, the way a transport does:

ex4.wav: COMPLETE   p(finished)=1.00  turn='finished, the assistant can reply'   emotion=neutral  server 59.6 ms
ex3.wav: INCOMPLETE p(finished)=0.11  turn='not finished, still talking'          emotion=sad      server 53.2 ms
ex5.wav: INCOMPLETE p(finished)=0.28  turn='hesitating or asking to wait'         emotion=angry    server 56.0 ms

Run the model yourself (recommended for real-time)

The default URL is our free trial API. It is rate limited (30 requests per minute), served from mainland China (the network round trip from elsewhere can be over a second); since 2026-10-13 it serves DuplexJev-32B-Para v1.2. For a live bot, serve the model next to your agent. For turn-taking, use DuplexJev-32B-Para v1.2 on one 80 GB GPU (the eot-bench numbers above):

pip install "vllm[audio]>=0.29" duplexjev-vllm "duplexjev[server]>=0.6"
vllm serve adventists-ai/DuplexJev-32B-Para --revision v1.2 --max-model-len 4096 --port 8000 &
duplexjev gateway --vllm http://localhost:8000/v1 --port 8420 --rate 1000000

On a smaller GPU, adventists-ai/DuplexJev-4B-Para needs about 10 GB; it is fine for emotion and the other questions, but its turn-taking has not had the v1.2 update. --rate 1000000 lifts the gateway's default limit of 30 requests per minute, which a live bot exceeds quickly.

Then pass url="http://localhost:8420".

Options

After each prediction turn.last_turn_class is finished, not_finished, backchannel or hesitating (reply, keep_listening, acknowledge with readout="act"), for your own routing.

If the gateway can't be reached, the analyzer logs the error and reports "not finished", so Pipecat falls back to its silence timeout and the conversation never blocks.

License

The plugin code is BSD-2-Clause. DuplexJev model weights are CC BY-NC 4.0 (non-commercial); see the model cards. For commercial use, contact jiejin@adventists.ai.