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How to narrate an explainer in another language with Explainroo

Render the same script with a local voice in Spanish, Japanese or another supported language.

  • Content
  • Intermediate
  • 1 hour
  • From the README
  • Any agent

Who it is forA teacher or creator who wants the same explainer for viewers who speak Spanish, French, Japanese or Chinese.

The problemRe-recording a narration in each language costs time and money, and a machine voice that mispronounces words is hard to spot.

The outcomeAn MP4 narrated in the chosen language by a local voice, with a speech check that flags words the voice got wrong.

What you need first

  • Node.js 20.11 or newer
  • ffmpeg
  • Chrome or Chromium
  • About 400 MB of disk space for the voice and timing models, downloaded once
  • A coding agent such as Claude Code or Codex, if you want the agent to write the video

Steps

  1. Install espeak-ng for Spanish, French, Italian, Portuguese or Hindi, for example with sudo apt install espeak-ng or brew install espeak-ng
  2. For Japanese or Chinese, install Python with misaki as described in AGENTS.md under the Japanese and Chinese section
  3. Write script.md in the language you want the voice to speak
  4. Render the video with explainroo render videos/<project> (inferred, check the README)
  5. Read the speech check output and fix any words the voice got wrong before you publish

Prompt for your agent

In the explainroo repo at <repo folder>, write a script in <language> and render an explainer video for <topic>. Expected output: one MP4 narrated in that language. Verify that the speech check reports no wrong words before you report the file path.

Caveat. The README says the non-English voices need espeak-ng or Python with misaki, so the setup takes longer than the English path.

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