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Overview

HeyGenVideoService integrates with HeyGen LiveAvatar to create interactive AI-powered video avatars that respond naturally in real-time conversations. The service handles bidirectional audio/video streaming, avatar animations, voice activity detection, and conversation interruptions to deliver engaging conversational AI experiences with lifelike visual presence.

HeyGen Video API Reference

Pipecat’s API methods for HeyGen video integration

Example Implementation

Complete example with interactive avatar

HeyGen Documentation

Official HeyGen API documentation and guides

HeyGen Platform

Access interactive avatars and API keys

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Installation

To use HeyGen services, install the required dependency: 
pip install "pipecat-ai[heygen]"

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Prerequisites

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HeyGen Account Setup

Before using HeyGen video services, you need:
  1. HeyGen Account: Sign up at HeyGen Platform
  2. API Key: Generate an API key from your account dashboard
  3. Avatar Selection: Choose from available interactive avatars
  4. Streaming Setup: Configure real-time avatar streaming capabilities

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Required Environment Variables

  • HEYGEN_LIVE_AVATAR_API_KEY: Your HeyGen LiveAvatar API key for authentication

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Configuration

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api_key
str
required
HeyGen API key for authentication.
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session
aiohttp.ClientSession
required
HTTP client session for API requests.
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session_request
LiveAvatarNewSessionRequest | NewSessionRequest
default:"None"
Configuration for the HeyGen session. When None, defaults to using the "Shawn_Therapist_public" avatar.
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service_type
ServiceType
default:"None"
Service type for the avatar session.

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Usage

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Basic Setup

import aiohttp
from pipecat.services.heygen import HeyGenVideoService

async with aiohttp.ClientSession() as session:
    heygen = HeyGenVideoService(
        api_key=os.getenv("HEYGEN_LIVE_AVATAR_API_KEY"),
        session=session,
    )

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With Custom Session Request

from pipecat.services.heygen.api_liveavatar import LiveAvatarNewSessionRequest

heygen = HeyGenVideoService(
    api_key=os.getenv("HEYGEN_LIVE_AVATAR_API_KEY"),
    session=session,
    session_request=LiveAvatarNewSessionRequest(
        avatar_id="your_avatar_id",
        version="v2",
    ),
)

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Notes

  • Bidirectional streaming: The service manages both sending audio to HeyGen and receiving avatar video/audio back through WebRTC.
  • Interruption handling: When a user starts speaking, the service interrupts the avatar’s current speech, cancels ongoing audio tasks, and activates the avatar’s listening animation.
  • Metrics support: The service supports TTFB metrics tracking using TTSStartedFrame and BotStartedSpeakingFrame signals.