different-crop.js

const output = {
  width: 320,
  height: 360,
};

const ratio = output.width / output.height;

let crop;
if (width > height) {
  crop = {
    width: height * ratio,
    height: height,
  };
} else {
  crop = {
    width: width,
    height: width / ratio,
  };
}

const face = {
  top: detection.box.top,
  left: detection.box.left,
  height: detection.box.bottom - detection.box.top,
  width: detection.box.right - detection.box.left,
};

const y = face.top - (crop.height - face.height) / 2;
const x = face.left - (crop.width - face.width) / 2;

const cropValue = `${crop.width}:${crop.height}:${x}:${y}`;
const scaleValue = `${output.width}:${output.height}`;

// send to ffmpeg