🎬 Video Editing Platform – Backend

A scalable and modular backend system for a web-based video editing platform, built with Node.js, Express, PostgreSQL, and FFmpeg. This backend allows users to upload videos, perform editing operations like trimming, subtitle overlay, and rendering, and download the final video—all through clean, RESTful APIs.

💡 Built with extensibility, modularity, and production-readiness in mind.

• ✅ Upload videos via API
• ✂️ Trim videos with customizable timestamps
• 📝 Add subtitles with precise time intervals
• 🧩 Render final video with applied edits
• ⬇️ Download the final processed video
• 🗃️ Local or cloud (S3-ready) storage support
• 🛠️ Prisma ORM for PostgreSQL
• 📦 Multer for file uploads
• 🎞️ FFmpeg (via fluent-ffmpeg) for video transformations

video-editor-backend/ ├── controllers/ # API logic (upload, trim, subtitle, render, download) ├── routes/ # API endpoint definitions ├── services/ # FFmpeg logic, subtitle generator, video processing helpers ├── prisma/ # Prisma schema and migrations ├── uploads/ # Video storage (local dev) ├── utils/ # Utility functions ├── app.ts # Express server setup ├── ffmpeg.ts # FFmpeg config and wrappers ├── prismaClient.ts # Singleton Prisma client ├── README.md

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POST /api/videos/upload

• Upload .mp4, .mov formats
• Metadata saved to DB
• Video saved to /uploads/ or S3

POST /api/videos/:id/trim

• Accepts start and end time in seconds
• Trims and saves new video
• DB is updated with the trimmed file path

POST /api/videos/:id/subtitles

• Accepts subtitleText, start, end
• Generates temporary .srt file
• Uses FFmpeg to burn subtitles into the video

POST /api/videos/:id/render

• Merges all changes (trimmed + subtitles)
• Saves the final edited video
• Updates video status = rendered
• (Optional) Triggers via background queue (BullMQ)

GET /api/videos/:id/download

• Returns final rendered video file
• Set appropriate headers for video download

git clone https://github.com/your-username/video-editor-backend.git
cd video-editor-backend
2. Install Dependencies
bash
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yarn install
3. Setup Environment Variables
Create a .env file with the following:

env
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DATABASE_URL=postgresql://user:password@localhost:5432/video_editor
PORT=3000
4. Setup Prisma & DB
bash
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npx prisma migrate dev --name init
5. Start the Server
bash
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yarn dev
📽️ Demo Video
📹 Google Drive Demo (with voice-over)

Includes full walk-through:

Uploading a video

Trimming

Subtitle overlay

Rendering and downloading final video

Explanation of folder structure and challenges

🧠 Architectural Highlights
Modular service structure: Easy to extend with new features like audio editing or overlays.

Clean Prisma integration: All video metadata managed with robust DB schema.

FFmpeg abstraction: Central utility to handle all command pipelines cleanly.

Error-handling and edge-case resilience: Handles missing inputs, invalid formats, and unexpected failures.

📌 Future Enhancements
 Add support for image overlays and audio tracks

 AWS S3 integration for uploads/downloads

 Add BullMQ + Redis job queue for rendering tasks

 Add Swagger documentation

 Role-based auth system for video access

👨‍💻 Author
Devdeep
Backend Developer
🌍 Mandsaur, India
📧 Email
📱 LinkedIn