AI Subtitle Generator:
Premium Case Study
How we built an AI-powered subtitle generator that transcribes videos in minutes using OpenAI Whisper and client-side FFmpeg.wasm compiling.
5,000+
Videos Processed
98.2%
Transcription Acc.
5 Mins
Editing Time
₹12L
Costs Saved
The Problem
Video editors spend hours manually transcribing, styling, and syncing subtitles for short-form content. Hiring human captioners is expensive (₹150-₹300 per video), and online caption generators charge high monthly API fees.
- ✕ 3+ hours spent per video adding captions manually
- ✕ Expensive human transcription costs eating content budgets
- ✕ Heavy server bandwidth required to upload large video files
- ✕ Inaccurate sync offsets on other auto-subtitle engines
The Solution
RAGSPRO designed a fast, hybrid AI Subtitle Generator that processes audio on-device and translates text via lightweight AI APIs:
Whisper Transcription
Uses OpenAI Whisper model for state-of-the-art multilingual transcription and timestamp sync
FFmpeg.wasm Processing
Converts, compresses, and cuts videos directly in-browser using WebAssembly before uploading
Dynamic Styles Editor
Interactive caption editor for font colors, custom shadows, emojis, and styling
VTT/SRT Exports
Instant download of standard subtitle files or hardcoded video burn-in options
Tech Stack
Frontend/UI
Next.js 14 + React Hook Form
Transcription
OpenAI Whisper API + Whisper.cpp
Video Engine
FFmpeg.wasm (WebAssembly)
Styling
Tailwind CSS + Framer Motion UI
Database
PostgreSQL (Supabase)
Hosting
Vercel + Cloudflare Stream CDN
Results
- ✓ **5,000+ videos processed** with an average 98.2% transcription accuracy
- ✓ Reduced caption creation time from **3 hours to 5 minutes**
- ✓ Saved client teams over **₹12L in outsourcing and video editing costs**
- ✓ WebAssembly video processing cut server hosting costs by **80%**
- ✓ Supports auto-translation to 15+ global and regional Indian languages
"Our content team spent 3 hours per video adding subtitles manually. RAGSPRO built an AI subtitle generator that does it in 5 minutes with 98% accuracy. We're now producing 10x more content and saved ₹12L in editing costs."
Karan Singh
Content Head, Media Company
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