npm install aperture.js

const aperture = require("aperture.js")();

const cropArea = {x: 100, y: 100, width: 500, height: 500};

aperture.startRecording({fps: 30, cropArea})
  .then(filePath => setTimeout(stopRecording, 3000));

function stopRecording() {
  aperture.stopRecording()
    .then(console.log); //=> /var/folders/r9/65knbqts47x3yg055cd739qh0000gn/T/tmp-15694AAzbYX1vzi2X.mp4
}

aperture.js was built to fulfill the needs of Kap, providing a JavaScript interface to the best available method for recording the screen. That"s why it"s currently a wrapper for a Swift script that records the screen using the AVFoundation framework.

Yes, we can, but the performance is terrible:

We want to bring aperture.js to Linux and Windows, but we don"t have time and resources for such tasks (we"re Mac users), so any help is more than welcome. We just want to enforce two things: performance and quality – it doesn"t matter how (ffmpeg, custom built native lib, etc) they are achieved.

aperture.js is in its early days. We"re working on adding more features, such as export to GIF, compression options, support for multiple displays, support for audio and much more. Check out our aperture.js issues on Kap to learn more.