| # | Requirement | Priority | Acceptance Criteria | |---|-------------|----------|---------------------| | FR‑1 | – Accept YouTube, Vimeo, Dailymotion, Facebook, Instagram, TikTok, and user‑uploaded MP4 links. | Must | - Invalid URLs show a clear error. - Supported URLs show a “✓” and a preview thumbnail. | | FR‑2 | Resolution/Format Picker – Populate list based on source capabilities (e.g., 144p‑8K, MP4/WEBM, audio‑only MP3/AAC). | Must | - List updates in < 500 ms after URL validation. - Pre‑select “best‑compatible” (720p MP4) for free users. | | FR‑3 | One‑Click Download – Trigger server‑side fetch, transcoding (if needed), and delivery via secure temporary link (expires in 10 min). | Must | - Download begins within 2 s of click. - Link is HTTPS and uses a signed token. | | FR‑4 | Batch Processor – Accept up to 100 URLs per request (CSV/JSON). Process in parallel with max 4 concurrent jobs per user (adjustable for premium). | Should | - Returns a zip file with all requested videos. - Provides per‑item status (success/failure) in a JSON manifest. | | FR‑5 | Subtitle Integration – Detect embedded or external subtitles (SRT, VTT) and optionally mux them into the output file. | Should | - A toggle “Include subtitles” appears when subtitles exist. - Output file contains subtitles track. | | FR‑6 | API Endpoint – POST /api/v1/download with JSON payload url, format, subtitles, api_key . Returns signed URL or job ID. | Must | - Rate‑limited (free: 20 req/min; premium: 200 req/min). - Proper error codes (400, 401, 429, 500). | | FR‑7 | CLI Wrapper – sxey-dl (Node/Python) that reads a file of URLs, calls the API, and saves files locally. | Should | - Works on Windows/macOS/Linux. - Shows progress bars per video. | | FR‑8 | Legal‑Use Guard – Run a quick “copyright‑risk” check (e.g., based on video metadata, content‑ID flags) and display a modal requiring user acknowledgment before proceeding. | Must | - Modal appears for “high‑risk” videos. - User can abort or proceed with explicit “I have the right”. | | FR‑9 | User Account System – Email‑based sign‑up, OAuth (Google, Apple), 2FA optional. Store API keys, download history, and tier status. | Must | - Users can view/download history (last 30 days). | | FR‑10 | Payment Integration – Stripe (or local alternatives) for subscription plans (Free, Pro $9.99/mo, Enterprise $49.99/mo). | Must | - Successful payment upgrades tier instantly. - Billing portal for cancellations. | | FR‑11 | Analytics Dashboard – Real‑time metrics: active users, downloads per hour, average latency, error rate. | Should | - Admin UI shows graphs; data exported as CSV. | | FR‑12 | Security – All traffic HTTPS, CSRF protection, rate limiting, IP‑based abuse detection, GDPR‑compliant data storage. | Must | - Pen‑test passes OWASP Top‑10. - No plain‑text passwords stored. | | FR‑13 | Performance Optimisation – Use edge CDN for static assets, keep‑alive connections, chunked streaming for large files (> 1 GB). | Should | - 95 % of downloads < 5 s for ≤ 720p on a 20 Mbps connection. | | FR‑14 | Responsive UI – Mobile‑first layout, progressive‑enhancement, accessible (WCAG 2.1 AA). | Must | - All core functions usable via keyboard/touch. - Color contrast ≥ 4.5:1. | | FR‑15 | Dark Mode – Automatic based on system preference, toggleable. | Nice‑to‑have | - All UI elements adapt without flicker. |
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"Hey, Sarah?" Elias called out to the senior dev in the next cubicle. "Did we launch a viral campaign I don't know about? People are looking for... well, videos. Specifically 'sxey' ones. On our domain." | # | Requirement | Priority | Acceptance
Based on the provided URL, it refers to a service typically known as a , which is generally available as a mobile application for Android and iOS. These tools are designed to help users download and manage video content from various websites and social media platforms for offline viewing. Key Features of the Service | | FR‑2 | Resolution/Format Picker – Populate
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