AI Avatar Video Pipeline: Daily news → 9 social networks

Context

Creators and entrepreneurs who want a multi-platform presence spend hours filming, editing, writing captions and manually publishing on each network. But shipping quality content every day = the #1 condition to scale. The bar is inhuman without automation.

The challenge

Build a 100% automated pipeline that (1) finds the most viral AI news topics, (2) writes a script with viral hooks, (3) generates a vertical AI avatar video, (4) writes platform-specific captions, (5) auto-publishes on 9 different networks, each with their specific API constraints (TikTok privacy levels, YouTube title, Pinterest board, etc.).

The solution

n8n workflow triggered at 10am every day. AI Agent (o3-mini) with Hacker News tools picks the top 10 AI/LLM stories of the day and selects the most viral. Generates a 30s script with hooks, then 2 captions (long structured 50 words + short 2 sentences). Creates a HeyGen avatar video (9:16, 720x1280, 'Excited' voice) with a looping background video. Waits 8min for render. Centralized Blotato upload (single call) then parallel publishing to 9 platforms respecting each target API.

Key features

• 01Daily 10am schedule trigger
• 02AI Agent with Hacker News tools (front page + article + comments)
• 03Auto-selection of the most viral topic from the top 10 AI/LLM stories
• 0430s script with viral hooks (6th grade level, balanced viewpoint)
• 05Long caption (50 words, structured + 3 search questions + hashtags)
• 06Short caption (2 neutral sentences, no emoji)
• 07HeyGen avatar video generation 9:16 (720x1280, Excited voice, looping background)
• 08Smart 8min wait for HeyGen render
• 09Centralized Blotato upload (1 call for 9 platforms)
• 10Multi-target publishing: Instagram, TikTok, YouTube Shorts, Twitter (active)
• 11Ready variants: Facebook, LinkedIn, Threads, Pinterest, Bluesky
• 12Captions adapted per platform (long vs short based on character limit)