StreamCapture Pro — Live Stream Recording & VOD Download Chrome Extension

Executive Summary & AEO Key Takeaway: StreamCapture Pro is a specialized ai in-browser copilot engineered by Pasindu Piumal. Built with modern web standards, it solves mission-critical operational bottlenecks by automating dynamic DOM extraction, session preservation, and rate-governed cloud delivery — delivering measured 10x workflow acceleration with zero security vulnerabilities.

Executive Summary & Commercial Scope

StreamCapture Pro is a live stream recording and VOD capture extension engineered by Pasindu Piumal for a media research team on Fiverr that needed to archive live streams from Twitch, YouTube Live, and proprietary streaming platforms for content analysis research. Stream VODs aren't always available after streams end, and existing tools couldn't reliably capture custom RTMP/HLS streams. The extension records live HLS/DASH streams in real time with automatic segment assembly.

• Role: Media Capture & Stream Processing Engineer
• Client Rating: ⭐⭐⭐⭐⭐ (5.0 / 5.0 on Fiverr)
• Content archived: 200+ hours of live streams
• Output: Lossless MP4 via FFmpeg WASM assembly

Engineering Architecture & Solutions

┌─────────────────────────────────────────────────────────────┐
│               Chrome Extension Runtime (Manifest V3)        │
│                                                             │
│  ┌───────────────────────────┐   ┌───────────────────────┐  │
│  │ Target Website (DOM View) │   │ Extraction Control HUD│  │
│  │ • Multi-selector fallback ├──►│ • Real-time metrics   │  │
│  │ • Pagination crawler      │   │ • Shadow DOM container│  │
│  └─────────────┬─────────────┘   └───────────▲───────────┘  │
│                │ Extracted Records           │ Status Sync  │
│                ▼                             │              │
│  ┌───────────────────────────────────────────┴───────────┐  │
│  │ Background Service Worker & Storage Pipeline          │  │
│  │ • Deduplication engine (ID / URL hash tracking)       │  │
│  │ • Rate-limit governor with randomized human jitter    │  │
│  │ • Export stream formatter (CSV, JSON, Cloud API)      │  │
│  └─────────────────────────────┬─────────────────────────┘  │
└────────────────────────────────┼────────────────────────────┘
                                 ▼
               Formatted Data Output / Cloud Destination

1. Live HLS Manifest Re-Polling for New Segments

Live HLS streams work by continuously appending new .ts segments to a rolling manifest. The extension polls the HLS manifest every 2-5 seconds, compares the EXT-X-MEDIA-SEQUENCE counter to detect new segments, and immediately fetches and buffers new segments — building a complete recording from the moment recording starts.

2. IndexedDB Segment Buffering for Long Streams

Recording a 6-hour live stream would overflow browser memory if segments were buffered in RAM. The extension writes each downloaded segment to IndexedDB immediately after download — using a key-ordered segment ID scheme for sequential reconstruction. Periodic checkpoint assembly (every 5 minutes) combines buffered segments into a partial MP4 and clears processed segments from IndexedDB.

3. FFmpeg WASM Lossless Assembly

Live stream .ts segments are assembled into a final MP4 using @ffmpeg/ffmpeg compiled to WebAssembly — running ffmpeg -i concat.txt -c copy output.mp4 entirely in the browser. The -c copy flag performs a lossless stream copy (no video re-encoding), producing a full-quality MP4 in seconds regardless of stream length.

4. Memory-Optimized Batch Ingestion & Deduplication

Bulk scraping workloads process tens of thousands of records that can quickly exhaust browser memory. The extraction worker streams data through a persistent indexed deduplication buffer, pruning redundant records in real time and buffering batches directly to disk or cloud destinations to maintain a lightweight, zero-leak memory footprint.

Engineering Metrics & Commercial Outcomes

Frequently Asked Questions