Overview
Book Trailer Factory turns a book cover and a one-line hook into a finished video trailer in about a minute. Authors pick a genre template, type in their title, tagline, and a short setting description, upload their cover, and get back a trailer rendered in three aspect ratios — vertical for TikTok and Reels, landscape for YouTube, and square for Instagram.
How It Works
- Per-book backgrounds — atmospheric scenes are generated to match the book's genre and setting, rather than pulled from generic stock footage
- Narration and music — a voiceover line and a music bed are produced per template
- Composition, not per-customer video — the heavy lifting is done with a composition pipeline, which keeps the cost per render low enough to sell trailers outright instead of by subscription
- Three aspect ratios from one purchase — the same trailer, cut for each platform, with no re-uploading
Stack
A Next.js front end on Vercel talks to a Python rendering worker (FastAPI + FFmpeg) on Railway. Payment is handled through Stripe, finished files are stored on object storage, and the author gets an email with a download link when the render is done.