Adify

Inspiration

Creating video ads for e-commerce products is expensive and time-consuming — hiring editors, voice actors, and music producers. Small Shopify merchants can't compete with big brands' ad budgets. Adify produces scroll-stopping short-form video ads from just a source clip and a product listing.

What it does

Adify is an AI-powered video ad generator for Shopify stores. A merchant connects their store, picks a product, uploads source video footage, and Adify produces a professional 15/30/60-second ad — complete with AI narration, generated background music, beat-synced cuts, spatial sound effects, and text overlays. It supports two ad styles: narrated (AI voiceover with sidechain-ducked music) and music-only (beat-snapped cuts with text overlays).

How we built it

We built a multi-stage AI pipeline orchestrated through a Next.js full-stack app:

Video Analysis — Gemini analyzes uploaded video to understand visual content, then generates ad copy, mood, voice selection, and precise cut timings
Voice Synthesis — ElevenLabs generates narration from the AI-written script, with per-sentence speed control matched to segment durations
Music Generation — Google Lyria generates mood-matched music in real-time via a streaming WebSocket session, outputting raw PCM that we manually encode into WAV
Video Composition — FFmpeg orchestrates the final render with a complex filter graph: trimming video segments to match narration timing, applying sidechain compression so music ducks under voice, adding spatially-panned whoosh SFX at cut points, and scaling everything to 1080x1920

The frontend is React 19 with Tailwind CSS, and we use Supabase for product metadata storage.