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How to caption the microphone live as you speak with Speech CPP

Show a live text transcript of your speech, with silence filtered out by a voice activity model.

Authorization notice. Speech CPP is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Remote script. The install step runs a script fetched from the internet, so review it before running.

Who it is forA presenter, streamer or developer building a voice conversation who needs on-screen or in-app captions from a microphone.

The problemLive captions usually depend on a cloud service, and raw microphone audio includes silences that waste recognition time.

The outcomeA terminal that writes the transcript as you talk, with the utterance still being said shown in grey.

What you need first

  • macOS on Apple silicon, Linux on x86-64, or Windows x64
  • Internet access to fetch the installer and models from Hugging Face the first time
  • Free disk space for the model files, for example 1.21 GB for qwen3-tts-0.6b
  • A terminal (PowerShell on Windows)
  • A microphone, for live transcription

Steps

  1. Install speech using the installer for your platform from the install section of the README.
  2. Run speech asr reazonspeech-v2 --vad silero-vad --live to transcribe the microphone.
  3. Speak a sentence and watch the grey text update until the utterance ends.
  4. Stop the command when finished with Ctrl+C (inferred).

Prompt for your agent

In the nyosegawa/speech.cpp repo, after installing speech, run `speech asr reazonspeech-v2 --vad silero-vad --live` and speak one Japanese sentence into the microphone. Expected output: the sentence appears as text in the terminal after you finish it. Verify that the words shown match what was said.

Caveat. The README describes live transcription for the command line, and the microphone must be available to the terminal session on your machine.

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