ptzoptics-node-server/pub/js/stream.js

/*jshint esversion: 6 */
let player;

function changeStream() {
    player.destroy();
    startStream();
}

function startStream() {
    const canvas = document.getElementById('streamStage');
    player = new JSMpeg.Player('ws://' + document.location.host + '/stream', {canvas:canvas});
}