Get media duration

getMediaDuration.js

const getMediaDuration = async (file, type) => {
  // type either video or audio

  return new Promise((resolve, reject) => {
    const element = document.createElement(type);
    element.preload = "metadata";
    element.onloadedmetadata = () => {
      window.URL.revokeObjectURL(element.src);
      resolve(element.duration);
    };
    element.onerror = (error) => {
      reject(error);
    };
    element.src = URL.createObjectURL(file);
  });
};