Python when sounddevice.PortAudioError: Error opening InputStream: Invalid sample rate [PaErrorCode -9997]

Question

I am currently building a voice AI agent using LiveKit. My current code base is from LiveKit.

from dotenv import load_dotenv
from livekit import agents
from livekit.agents import AgentSession, Agent, RoomInputOptions
from livekit.plugins import (
 openai,
 noise_cancellation,
)
load_dotenv(".env")
class Assistant(Agent):
 def __init__(self) -> None:
 super().__init__(instructions="You are a helpful voice AI assistant.")
async def entrypoint(ctx: agents.JobContext):
 session = AgentSession(
 llm=openai.realtime.RealtimeModel(
 voice="coral"
 )
 )
 await session.start(
 room=ctx.room,
 agent=Assistant(),
 room_input_options=RoomInputOptions(
 # For telephony applications, use `BVCTelephony` instead for best results
 noise_cancellation=noise_cancellation.BVC(),
 ),
 )
 await session.generate_reply(
 instructions="Greet the user and offer your assistance. You should start by speaking in English."
 )
if __name__ == "__main__":
 agents.cli.run_app(agents.WorkerOptions(entrypoint_fnc=entrypoint))

I met the following errors when I tried: uv run agent.py console:

 await session.start(
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/opentelemetry/util/_decorator.py", line 71, in async_wrapper
 return await func(*args, **kwargs) # type: ignore
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/livekit/agents/voice/agent_session.py", line 568, in start
 await asyncio.gather(*tasks)
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/livekit/agents/voice/chat_cli.py", line 271, in start
 self._update_microphone(enable=True)
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/livekit/agents/voice/chat_cli.py", line 339, in _update_microphone
 self._input_stream = sd.InputStream(
 ^^^^^^^^^^^^^^^
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/sounddevice.py", line 1452, in __init__
 _StreamBase.__init__(self, kind='input', wrap_callback='array',
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/sounddevice.py", line 909, in __init__
 _check(_lib.Pa_OpenStream(self._ptr, iparameters, oparameters,
 File "/home/sh1nata/Downloads/NailAIHub/backend/.venv/lib/python3.12/site-packages/sounddevice.py", line 2823, in _check
 raise PortAudioError(errormsg, err)
sounddevice.PortAudioError: Error opening InputStream: Invalid sample rate [PaErrorCode -9997]

I am using Ubuntu 24.04 LTS. I'm glad for your help!

• Darryn Campbell: Looks like you are getting a sample rate error. Can you try adjusting the sample_rate in the AudioInputOptions (audio_input is part of the room options) - docs.livekit.io/agents/build/sessions/#audiooutputoptions.