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How to render a narrated comparison video with free Edge TTS with Auto Compare Video

Generate voiceover with Edge TTS, which needs no API key, and render an existing comparison video to MP4.

  • Content
  • Intermediate
  • 45 minutes
  • From the README
  • Any agent

Who it is forA creator with no paid voice service who wants a narrated Vietnamese comparison short from the terminal.

The problemNarration usually needs a paid voice account, and the video timing has to match each spoken line.

The outcomeA rendered MP4 in the renders folder of the dev-vs-devops project, with voiceover timed from measured audio length.

What you need first

  • Node.js 18 or newer
  • FFmpeg and FFprobe available in PATH
  • One TTS provider: VieNeu TTS (needs CIT Voice Studio running locally), Edge TTS (no API key), or Vbee TTS (needs App ID and Access Token)
  • Optional: an AI coding agent such as Claude Code, Cursor or Codex to run the create-video skill

Steps

  1. Run cp .env.example .env and set TTS_PROVIDER=edge in .env.
  2. Run cd videos/dev-vs-devops. (inferred, check the README)
  3. Run node scripts/generate-vo.mjs to create the voiceover files and durations.json.
  4. Run npm run dev to preview the video in the local preview server.
  5. Run npm run render to write the MP4 to renders/.

Prompt for your agent

In the auto-compare-video repo, set TTS_PROVIDER=edge in .env and generate the voiceover for videos/dev-vs-devops, then render it. Expected output: an MP4 in videos/dev-vs-devops/renders/ and assets/vo/durations.json with measured clip lengths. Verify that the render command finishes without errors and that the MP4 plays.

Caveat. The README says Edge TTS is free and needs no API key, but it does not describe any usage limits, so check the service before generating a large batch of videos.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for Cuongyd196/auto-compare-video and "Render a narrated comparison video with free Edge TTS"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

Cursor, ChatGPT, others

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