AI Social Video Creation Tool

I’m building an AI-driven video maker/editor that lets users create videos from text prompts, polish clips they already have, and quickly stitch photos or short footage into engaging content. The primary goal is to give social-media managers everything they need in one place so they can keep their Instagram and YouTube feeds active without hopping between multiple apps.

Here’s what I need from you:
• A working solution that covers those three creation modes from day one.
• Smooth export presets optimised for Instagram and YouTube (aspect ratios, bitrate, captions, etc.).
• An intuitive interface—web or mobile is fine—as long as non-technical users can pick it up fast.
• Solid AI or template-based features for text-to-video, automatic trimming, transitions and on-brand styling.

Show me examples of similar AI or video-editing products you’ve delivered and explain the tech stack you’d use to pull this off. Experience building consumer-friendly creative tools will stand out most.