Building a Live Translation Broadcast App with Gemini 3.5 Live API, LiveKit, and Google Cloud Run

This video demonstrates a live translation broadcast application built with the Gemini 3.5 Live Translate model, LiveKit, and Google Cloud Run. It explains how the demo works, how to set it up locally, and how to deploy it to production.

■ Demo Overview
- Live translation broadcast with event IDs and language selection
- Session management: one session per target language, reusing existing sessions
- Use cases for live events and presentations

■ Technical Implementation
- Using Next.js, LiveKit, and the Gemini API
- WebSocket connections and WebRTC for audio and captions
- Translation bridge and session manager code

■ Deployment and Scaling
- Deploying to Google Cloud Run with Docker and Secret Manager
- Scaling limitations: max one instance, 15–20 simultaneous languages
- Recommendations for scaling beyond the demo

This video is for developers interested in integrating live translation into their own applications. Viewers will learn how to build and deploy a similar system and understand the architectural considerations involved.