I Built a Real-Time Multilingual Dubbing Platform and Used TestSprite MCP to Test It

What if you could speak, and everyone listening heard you in their own language, with no noticeable delay? That question turned into PolyDub. What It Does Three modes: Live Broadcast: one speaker, listeners worldwide, each hearing a dubbed stream in their language Multilingual Rooms: everyone speaks their own language, everyone hears everyone else in theirs VOD Dubbing: upload a video, download a dubbed MP4 with SRT subtitles The real-time pipeline: Mic -> WebSocket -> Deepgram Nova-2 (STT) -> G