Aituber — AI Virtual Idol Interaction Platform
A real-time interaction platform featuring live chat, karaoke synchronization, and YouTube Live streaming integration, built to handle thousands of concurrent users.
Challenge
The platform needed to sustain high-concurrency WebSocket connections for simultaneous chat, reactions, and karaoke events while also processing and syncing audio/video streams for YouTube Live — all with sub-100ms latency requirements.
Solution
Built a segmented ActionCable architecture backed by Redis pub/sub for message fan-out. Integrated FFmpeg with a Node.js sidecar to handle real-time audio/video stream processing. Offloaded heavy background work to Sidekiq to keep the main request cycle lean.
Impact Metrics
Comparison before and after implementation.
Concurrent WebSocket Connections
~200
→
2,000+
Message Delivery Latency
> 500ms
→
< 80ms
Key Achievements
Real-Time Scale
Sustained 2,000+ concurrent WebSocket connections per instance with zero dropped messages.
YouTube Live Integration
Delivered stable live streaming with synchronized audio/video using FFmpeg + Node.js pipeline.
Karaoke Sync Engine
Built precise lyric synchronization broadcast via ActionCable with < 100ms drift tolerance.