Build Video Editing App -- 2

I want to create a dedicated video-editing application from the ground up. Its core purpose is straightforward: let users import footage and work with it quickly, smoothly and reliably. I’m open to platform and tech-stack recommendations, as long as you can justify how they will deliver fast processing, intuitive controls and a modern UI.

Here’s what I need from you:

• A clear proposal outlining architecture, chosen frameworks or libraries, and how you’ll ensure performance with high-resolution footage.
• Wireframes or a simple clickable prototype so I can sign off on the overall flow before you dive into code.
• A modular codebase with clean documentation, making future feature additions easy.
• A short walkthrough video or live demo at hand-over so I can see the app in action and understand the key implementation points.

If you have past work on video or media apps—especially anything involving real-time preview, layered timelines, or hardware-accelerated rendering—include that in your response.