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How to make an explainer video from one sentence with Frametell

Type a topic, approve the storyboard, and get a 1080p narrated MP4 with subtitles.

  • Top pick
  • Content
  • Intermediate
  • 30 minutes
  • From the README
  • Any agent

Credentials. Model provider and ElevenLabs API keys are entered as environment variables or in Settings, so keep them out of shared shells, logs and screenshots.

Who it is forA knowledge creator who needs a short explainer on a topic today and does not want to learn video editing.

The problemProducing a narrated explainer takes scripting, voiceover, slide design and editing, which slows down a solo creator.

The outcomeA finished 1080p MP4 with subtitles and publishing notes, built from a single sentence after you sign off on the storyboard.

What you need first

  • Node.js 22.19 or later and pnpm (source install), or the macOS Apple Silicon .dmg from the latest release
  • Chrome, Edge or Chromium installed, used to draw and render the pages
  • An API key for a model provider such as Anthropic, OpenAI, Google or OpenRouter
  • An ElevenLabs API key for the voiceover (optional for source runs; Volcengine TTS for Chinese voices)

Steps

  1. Download the macOS app from the latest release, or run git clone https://github.com/sitor-ai/frametell.git && cd frametell.
  2. If running from source, run pnpm install && pnpm build.
  3. Set a provider key, for example export ANTHROPIC_API_KEY=..., and optionally export ELEVENLABS_API_KEY=....
  4. Run node apps/cli/dist/cli.js serve and open the studio in your browser.
  5. Enter your sentence, review the storyboard pages, edit anything that is wrong, then approve it so the narration, voice, pages and render can run.

Prompt for your agent

Use the Frametell repo at sitor-ai/frametell. Build it with pnpm install and pnpm build, then start the studio with node apps/cli/dist/cli.js serve and create a video about <topic> in English. Expected output: a 1080p MP4 with subtitles; verify that the storyboard was shown for approval before any pages were drawn.

Caveat. The macOS app covers only Apple Silicon Macs for now, so Windows and Intel Mac users must run from source.

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