Need Video to Gif Maker 4 website.. Flash or HTML5

Hello, I need a nice HTML5 Script or Adobe Flash application that converts HD videos to Gif animations for site HDgif.com.. User Interface: - Enter URL of video - select region to convert (up to 20 frames) - Change Speed - Convert to optimized Gif file (up to 1280x720p) - upload to site with watermark check out [login to view URL] - they have similar feature to convert youtube video to gif.. If Flash, need a nice interface - I can design.. If HTML5 must be fast and work properly.. please bid only if you have good solution.. thank you!