Auto-Generate Platform-Specific Posts from YouTube Videos with Dumpling AI

Overview

This workflow automatically generates platform-specific social media posts (Instagram, Facebook, LinkedIn) from YouTube videos. It reads a topic from a Google Sheet, searches YouTube via Dumpling AI, selects the best matching video using GPT-4o, fetches its transcript, and creates tailored posts with AI-generated images. The final output is saved back to Google Sheets, making it ideal for content creators and marketers who want to repurpose video content across social media platforms efficiently.

Workflow Steps

1. Trigger Search Schedule — Schedule Trigger (No auth) — Runs the workflow on a schedule. Configured to run at regular intervals (default: every hour) but you can customize the cron or interval in the node settings.

2. Get Unsearched Topic from Google Sheet — Google Sheets (OAuth2) — Reads a topic from the "YouTube Topics" sheet. Uses a filter to find rows where the "Searched?" column is empty, returning the first match. Requires Google Sheets OAuth2 credentials.

3. Search YouTube via Dumpling AI — HTTP Request (Header Auth) — Sends a POST request to Dumpling AI's YouTube search endpoint. The query is dynamically populated from the Google Sheets topic. Requires a Dumpling AI API key configured as HTTP Header Auth.

4. Filter + Sort YouTube Videos — Code (No auth) — Custom JavaScript code that extracts video data from the search results, filters for video types, sorts by published time (newest first), and returns the 3 most recent videos.

5. Prepare Video List for AI — Aggregate (No auth) — Combines all video items into a single array, preparing the data for the AI node to process.

6. Select Best Video with GPT-4o — OpenAI (API Key auth) — Uses GPT-4.1 to analyze the search results and pick the most relevant video based on the original topic and current date. Returns a JSON structure with the selected video details. Requires an OpenAI API key.

7. Get Transcript (Dumpling AI) — HTTP Request (Header Auth) — Fetches the YouTube video transcript via Dumpling AI's transcript endpoint. Requires the same Dumpling AI credentials as node 3.

8. Generate Posts with GPT-4o — OpenAI (API Key auth) — Takes the transcript and generates three platform-specific posts (Instagram, Facebook, LinkedIn) with matching image prompts. Each post is tailored to the platform's tone and format. Uses the same OpenAI credentials as node 6.

9. Generate Instagram Image (Dumpling AI) — HTTP Request (Header Auth) — Generates an AI image for the Instagram post using FLUX.1-pro model. Prompt comes from the GPT-4o output.

10. Generate Facebook Image (Dumpling AI) — HTTP Request (Header Auth) — Same as node 9 but for Facebook post image.

11. Generate LinkedIn Image (Dumpling AI) — HTTP Request (Header Auth) — Same as node 9 but for LinkedIn post image.

12. Format Instagram Post — Set (No auth) — Combines the Instagram post text, platform name, and image URL into a structured format for saving.

13. Format Facebook Post — Set (No auth) — Same as node 12 but for Facebook.

14. Format LinkedIn Post — Set (No auth) — Same as node 12 but for LinkedIn.

15. Save Instagram Post to Sheet — Google Sheets (OAuth2) — Appends the formatted Instagram post (platform, content, image URL) to the "Social Media Post" sheet.

16. Save Facebook Post to Sheet — Google Sheets (OAuth2) — Same as node 15 but for Facebook.

17. Save LinkedIn Post to Sheet — Google Sheets (OAuth2) — Same as node 15 but for LinkedIn.

18. Merge Post Results — Merge (No auth) — Combines all three saved post results into a single output.

19. Update Topic Status in Sheet — Google Sheets (OAuth2) — Updates the original topic row in "YouTube Topics" sheet, setting "Searched?" to "Yes" to prevent reprocessing.

Setup Instructions

Required Accounts & Credentials

1. Google Account — For Google Sheets access. Create OAuth2 credentials in n8n for Google Sheets.
2. OpenAI Account — For GPT-4.1 access. Create an API key from platform.openai.com.
3. Dumpling AI Account — For YouTube search, transcript, and image generation. Sign up at dumplingai.com and get an API key.

Google Sheets Setup

Create a Google Sheet with two sheets:

• YouTube Topics (columns: Youtube Topics, Searched?) — Add your topics with "Searched?" column empty for unprocessed items.
• Social Media Post (columns: platform, Content, Image) — Will store generated posts.

Configuring Credentials

1. In n8n, go to Credentials → Add Credential.
2. Add Google Sheets OAuth2 credentials.
3. Add OpenAI credentials with your API key.
4. Add Header Auth credentials with your Dumpling AI API key.

Node Configuration

• Update the documentId in all Google Sheets nodes to your sheet's ID.
• Verify the sheetName values match your sheet tab names.
• Adjust the schedule trigger interval as needed.

Use Cases & Variations

• Content Repurposing — Automatically turn YouTube videos into social media posts for multiple platforms.
• Batch Processing — Add multiple topics to the sheet; the workflow processes one per run.
• Custom Platforms — Modify GPT-4o prompts to add Twitter, TikTok, or other platforms.
• Brand Voice Customization — Update the system prompt to match your brand's tone.
• Manual Trigger — Replace the schedule trigger with a webhook for on-demand processing.
• Review Before Posting — Add a manual approval step before saving to sheets.

This workflow saves hours of manual content creation and ensures consistent, platform-optimized posts.

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