This was the first prompt:
> Hello, I need a webapp where I can drag a drop a video and by using ffmpeg I can export the video with some modifications. For example, I just recorded a screen capture on my pixel 10a. I want to be able to load that video inside a square viewport, add inset and roudned corners and dropshadow to the screenrecording video, add a background and then export a new video for sharing on twitter.
Later I replaced ffmpeg with WebCodecs.