Generate images and convert to video using Flux, Kraken & Runway

(Image Generation → Hosting → Video Generation)

This workflow is designed for creators, automation enthusiasts, and indie hackers who want to generate image-based videos automatically using AI tools — at a low cost.

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⚙️ Workflow Overview

This automation performs the following steps:

1. Trigger (Schedule or manual)
2. Generate an image using Flux (choose between two APIs)
3. Upload the image to Kraken.io to get a public URL
4. Send the image to Runway ML (choose between two APIs) to generate a video
5. Receive the video as a URL — ready for posting, download, or further automation

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🛠️ Step-by-Step Setup

🖼️ Flux (Image Generation)

You can use either of the following providers:

Option 1: Flux by BlackForest Labs (Direct API)

🔑 Get your API key here: https://docs.bfl.ml/

• Paste your API key in the HTTP Request node named Flux (Blackforest)
• You can customize prompts or styles inside the JSON body

Option 2: Flux via RapidAPI

🔑 Subscribe and get your key here: https://rapidapi.com/poorav925/api/ai-text-to-image-generator-flux-free-api/playground/apiendpoint_e38039ee-1912-4ef9-b4d4-270d72fca851

• Enter your RapidAPI key in the X-RapidAPI-Key header
• Optional: tweak prompts, style, or resolution inside the JSON body

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🐙 Kraken.io (Hosting the Image Publicly)

Runway ML requires the image to be publicly accessible. We use Kraken.io to host the generated image and return a public URL.

🔑 Get your API credentials: https://kraken.io/account/api-credentials

Setup:

1. Copy your API Key and API Secret
2. Open the Kraken Upload node in n8n
3. Replace placeholders with your credentials
4. The node uploads your image and gives back a public image URL for Runway to use

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🎬 RunwayML (Video Generation)

You also have two options here:

Option 1: Runway Official API

🔑 Get your credentials at: https://dev.runwayml.com/

• Use the public image URL from Kraken in the JSON body
• Paste your Bearer token in the Authorization header
• Customize other settings like video length, style, FPS, etc.

Option 2: Runway via RapidAPI

🔑 Subscribe and get your key here: https://rapidapi.com/fortunehoppers/api/runwayml/playground/apiendpoint_93c8554d-8097-40cd-8252-3d4dec9c0e68

• Paste your RapidAPI key in the request header
• Customize prompt and generation options in the body
• Use the Kraken-generated image URL as the input source

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📤 What to Do with the Video

Once the video is generated, you’ll get a direct video URL. You can:

• Save it to Google Sheets or Notion
• Send it via email
• Trigger a YouTube upload automation
• Or download manually for editing and reposting

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💡 Optional Tips & Notes

• You can schedule this workflow to generate AI videos daily or weekly
• Combine it with a Google Sheet of prompts for bulk automation
• Try using a consistent visual style or theme for better branding
• This workflow is lightweight and affordable — perfect for indie projects or experimental content generation
• Great for shorts, quote visuals, music loops, AI art promos, etc.

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🔗 Resources

• Flux (Blackforest) Docs
• Flux on RapidAPI
• RunwayML Official Docs
• Runway on RapidAPI
• Kraken.io API Dashboard

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🙋 Need Help?

Feel free to reach out:

• 🐦 Twitter: @juppfy
• 📧 Email: [email protected]

If you’d like to hire me for custom n8n workflows or product automations, don’t hesitate to get in touch.