
OpenDubber
Live Vietnamese AI dubbing for Chrome
A published Chrome extension that translates English video subtitles with an LLM and speaks them in Vietnamese, synchronized with playback on YouTube, Udemy and Coursera.
- Runs Kokoro TTS on-device with ONNX Runtime Web (WebGPU, WASM fallback), 4× faster than real time on a laptop GPU; benchmarked FP32/FP16/INT8 variants.
- FastAPI translation backend with structured JSON output, SQLite caching, provider fallback and rate limiting; 4 LLMs compared with blind LLM-as-judge scores, latency and load tests.
- Speech follows the video clock with pitch-preserving speed-up and a catch-up mode for slow CPUs.
