Social Media Promo Video Builder

I want to build a browser-based creator that lets me turn raw clips or images into eye-catching promotional videos ready for instant upload to Instagram, Facebook, TikTok and similar platforms. The entire flow should feel purpose-built for social media marketing: fast aspect-ratio presets (1:1, 9:16, 16:9), snappy transitions, and export settings that meet each network’s compression limits without losing visual clarity. Because sound sells, the most critical feature is a robust music and audio layer. I need: • Music and audio options – searchable, royalty-free tracks, basic trimming, volume ducking and simple voice-over recording. Templates, animated text or other niceties could be added later, yet the first milestone revolves around getting that audio workflow flawless inside a clean drag-and-drop timeline. Deliverables 1. A working web or desktop application (React, Electron, or similar are fine) that imports common media formats and outputs MP4/H.264 files tuned for the main social feeds. 2. Integrated music library with the controls listed above plus a clear path for adding more tracks over time. 3. Brief usage guide and source code hand-off so I can extend the tool internally. I’ll test by producing a 30-second promo from stock assets: playback must remain smooth in-app, exported file size under 20 MB, and audio levels balanced on default settings.