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How to generate spoken narration audio from a text file with Speech CPP

Turn a script into a WAVE file of speech using a local Qwen3-TTS voice.

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 content creator, teacher or developer who needs narration for a video, lesson or prototype and wants to avoid a paid voice service.

The problemRecording narration takes time, and cloud text-to-speech may be costly or send private scripts off the machine.

The outcomeA WAVE file with the spoken text, produced locally from a named voice.

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.
  2. Run speech tts qwen3-tts-0.6b --voice ryan -o hello.wav "Hello. It will be sunny in Tokyo tomorrow." to make the first file. The model is fetched the first time.
  3. Replace the quoted text with your own sentence, or pipe a file to stdout with speech tts qwen3-tts-0.6b --voice ryan -o - (inferred from the README's note that output can go to stdout). (inferred, check the README)
  4. Play hello.wav and check the pronunciation.

Prompt for your agent

Using the nyosegawa/speech.cpp repo, install speech and run `speech tts qwen3-tts-0.6b --voice ryan -o <output>.wav "<script text>"`. Expected output: a WAVE file at the path given, with the script spoken in the ryan voice. Verify that the file plays and matches the script.

Caveat. The first run downloads a 1.21 GB model, so plan for that time and disk space before generating audio.

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