How It Works

How
StreamTranslate Works

StreamTranslate turns your voice into live translated captions on your stream in under 500ms. Here's exactly how.

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The 4-Step Process

StreamTranslate handles the full pipeline from your microphone to your viewers seeing translated subtitles — all in under 500ms.

  • 1. Capture: StreamTranslate listens to your microphone via your browser or the OBS browser source session
  • 2. Transcribe: Your speech is transcribed using AI speech recognition (multiple providers for redundancy)
  • 3. Translate: The transcribed text is translated into your target language using Azure, Google, or Amazon translation engines
  • 4. Display: The translated caption appears on your stream overlay within 500ms — burned into the frame all viewers see

The OBS Browser Source

StreamTranslate displays captions on your stream via an OBS browser source. This is a standard OBS feature that renders a URL as an overlay layer on your stream.

  • You add a browser source in OBS and paste your StreamTranslate URL
  • The browser source renders as a transparent overlay on your scene
  • Captions appear in the overlay in real time as you speak
  • The overlay is visible in your OBS preview and in the final stream

Speech Recognition

StreamTranslate uses professional-grade cloud speech-to-text engines for transcription. This gives significantly higher accuracy than free alternatives.

  • Multiple STT providers with automatic fallback for reliability
  • Handles natural conversational speech, not just dictation-style speech
  • Streaming-specific vocabulary training improves gaming and stream terminology accuracy
  • Noise cancellation helps when streaming with fans or other background audio

Translation Engine

Translation happens via multiple providers — Azure Cognitive Services, Google Cloud Translation, and Amazon Translate — with automatic selection based on language and latency.

  • Azure Cognitive Services: fastest for European languages
  • Google Cloud Translation: strongest for Asian languages (Japanese, Korean, Chinese)
  • Amazon Translate: reliable fallback across all supported languages
  • Target languages: Spanish, Japanese, Korean, Portuguese, French, German, Arabic, Hindi, Russian, Chinese, and 20+ more

Related

NEW

Translate your videos

Upload VODs, clips, or recordings. Translate into 65 languages and make the subtitles yours.

$0.20 per minute · $0.50 minimum · No subscription needed
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Also stream IRL

Also supports IRL with Moblin and the OBS audio plugin, including home and cloud OBS setups such as IRL Toolkit.

Use an OBS receiver for IRL Pro, Larix Broadcaster, PRISM Live Mobile or TVU Go. Cloud providers may need to install the plugin on your server.

Moblin · Moblin Browser Source · Cloud OBS · IRL Toolkit · OBS Studio · IRL Pro · Larix Broadcaster · PRISM Live Mobile · TVU Go · MediaMTX

IRL setup guide · Desktop setup guide