A macOS menu bar app that converts a video into an App Store preview file (886×1920, 30fps, max 28 seconds, H.264/MP4 with a looped soundtrack).
The export runs in 3 stages:
- Process. Reads the video frame by frame, scales each frame to fit onto a black 886×1920 canvas, throttles to 30fps, and trims anything past 28 seconds.
- Mux. Adds the chosen soundtrack, looping it to match the video length, and exports with faststart.
- Save. Writes the finished file to the Desktop, or shows a save panel when sandboxed.