Automated YouTube SEO, Thumbnail Generation & Video Upload via AI, Google Drive & LemonFox
Pre-requesties:
- Video uploaded to gdrive.
- And sponsor file with the similar formart "videotitle_sponsors.txt"
Node-by-Node Functional Breakdown
This workflow is an end-to-end "Content-to-Publish" engine. I’ve broken it down by the specific stage of production:
Stage 1: The Intake & Access
| Node Name |
What it does |
| When File Added in Drive |
The Trigger: Watches your "transcript" folder. The moment you drop a video file here, the engine starts. |
| If Video Mime Type |
The Gatekeeper: Ensures the file is actually a video (e.g., .mp4) and not a random document or image before proceeding. |
| Grant Temp File Access |
The Key: Temporarily changes the Drive file's permissions to "Anyone with link" so external AI tools (LemonFox) can download and process it. |
Stage 2: Transcription & Data Prep
| Node Name |
What it does |
| Post Audio to Lemonfox |
The Ears: Sends the video to LemonFox AI to extract the spoken word into a structured SRT (subtitle) format. |
| Clean SRT Content |
The Editor: A JavaScript node that cleans up technical formatting issues and unescapes characters to make the text readable for the AI. |
| Create Text File in Drive |
The Archive: Saves your clean transcript back to Google Drive for your records. |
| Search/Fetch Sponsor Info |
The Researcher: Looks for a specific .txt file named after your video that contains sponsor details (Name/Email) so they can be credited. |
Stage 3: AI Strategy & Creative
| Node Name |
What it does |
| Content Analysis Agent |
The Strategist: Uses Gemini to analyze the transcript and find the "Big Idea." It then writes a high-CTR Title, SEO Description, and Tags. |
| Parse Structured Output |
The Translator: Ensures the AI's creative writing is formatted as strict JSON so the next "Upload" step can understand it. |
| Generate Thumbnail Image |
The Artist: Takes a specific "Thumbnail Prompt" written by the AI and uses Gemini (Nano Banana) to generate a high-quality 16:9 image. |
Stage 4: Publishing & Cleanup
| Node Name |
What it does |
| Upload to YouTube API |
The Publisher: Hits your upload endpoint, sending the original video link, the AI-generated metadata, and the AI-generated thumbnail. |
| Delete Original File Permissions |
The Security Guard: Immediately revokes the "Anyone with link" access to your Google Drive file, locking it back down for privacy. |
