CaptionDB

CaptionDB is an AI-powered platform that transforms videos into structured, searchable, and caption-rich content through an intelligent multi-stage processing pipeline. Instead of treating a video as a single asset, CaptionDB automatically detects scene boundaries, extracts representative keyframes, filters low-quality or duplicate images, performs vision analysis using multimodal AI, and generates context-aware captions tailored to different tones and use cases. The system is built with a production-grade architecture using Clean Architecture principles, ensuring complete separation between the Domain, Application, and Infrastructure layers. The backend is powered by FastAPI, PostgreSQL, SQLAlchemy, Redis, and Celery for scalable asynchronous processing, while the frontend uses Next.js 15, React Query, Zustand, and TypeScript to deliver a modern user experience. CaptionDB is designed to be AI-provider agnostic. Vision analysis, caption generation, authentication, storage, and background processing are all abstracted behind interfaces, making it easy to replace or extend providers without changing business logic. The platform includes OAuth authentication, project management, task monitoring, progress tracking, and an optimized AI pipeline that minimizes unnecessary token usage through scene detection and intelligent keyframe selection. By combining computer vision, multimodal AI, and scalable cloud architecture, CaptionDB significantly reduces the time required to generate meaningful captions and structured metadata for videos. The result is a fast, extensible, and production-ready platform suitable for content creators, educators, marketers, media teams, and developers who need automated video understanding at scale.