Provide users with advanced options for video thumbnail generation

Adds FFmpeg/ImageMagick integration for dynamic thumbnail creation with API endpoints.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 50814a1e-92e4-4968-856f-7bc7eedf5e8f
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/50814a1e-92e4-4968-856f-7bc7eedf5e8f/L923Cjb

replit.md

@@ -16,12 +16,14 @@ Preferred communication style: Simple, everyday language.
 - Added fullscreen capabilities and proper video controls
 - Resolved authentication issues with private video library (ID: 476412)
 
-### Thumbnail System ✅
-- Implemented dynamic SVG thumbnail generation with video titles and duration
-- Created attractive blue gradient backgrounds with play button overlay
-- Thumbnails display properly with video metadata (title, duration)
-- Optimized for social media sharing with proper dimensions (400x225px)
-- Eliminated dependency on external thumbnail services
+### Advanced Thumbnail Generation System ✅
+- Implemented FFmpeg and ImageMagick for extracting real frames from videos
+- Added ability to specify exact timestamp for thumbnail generation (e.g., ?t=30)
+- Created comprehensive ThumbnailGenerator class with multiple extraction options
+- Added API endpoints for generating multiple thumbnails at once
+- Built React component for easy thumbnail selection and generation
+- Fallback to attractive SVG thumbnails when video extraction fails
+- Cache system for optimized performance and reduced server load
 
 ### Video Sharing Functionality ✅
 - Added comprehensive share functionality for social media platforms