Fix React Video Bugs

My demo application is built with React and includes a custom video-generation flow. I’m running into bugs that surface when the app tries to create the final video file, so the current build either crashes or returns a corrupted result.

Here’s what I need:
• Diagnose and resolve the video-generation issues so each render completes without errors.
• Refactor or patch any affected React components and supporting scripts.
• Validate the fix across common browsers and confirm that produced videos play back smoothly.
• Document the changes and outline any additional steps I should follow to keep the pipeline stable.

The codebase is clean and well-commented; I’ll share a Git repo and a short screen-capture walkthrough to get you started. If you prefer FFmpeg, OpenCV, or another toolkit, feel free to integrate it—whatever delivers a reliable, high-quality output is fine by me.

I’m aiming for a detailed, production-ready solution rather than a quick workaround, so please factor in testing and a concise hand-off note.