LED Wall Slideshow Generator

I have a collection of graphics / illustrations that need to be stitched into a seamless video loop for a tall, narrow LED wall running at a 1 : 3 aspect ratio. Each graphic should glide onto the screen with a simple slide transition, hold for a set duration, then give way to the next. What I need is a small generator—this can be a Python script that leverages FFmpeg, an After Effects template with expressions, or any streamlined tool you’re comfortable with—that lets me drop a folder of images in, choose the display time per image, and instantly export a single video in the required 1 : 3 canvas. If your solution can default to MP4 that’s perfect, but I’m open to other standard formats as long as the final file plays back smoothly on the LED processor. Deliverables: • The working generator (script, project file, or lightweight app) • One sample render showing the slide transition at the correct aspect ratio • A short read-me so I can adjust image order, duration, and re-export on my own If you have a smart way to automate cropping or padding so any oddly sized illustration still fills the frame cleanly, even better. Send over a quick outline of your approach, estimated turnaround, and anything you need from me to get started.