random.html

<script>
/*
	Add your youtube video IDs below, then in OBS create a new browser source, check the "local file" box, then browse for this file.
*/
// Add video ids here (array of strings)
const videos = [
'7ZguAEoNpZw',
'WBYsMkyoS58'
];
</script>
<div id="main">
    <div id="player"></div>
</div>

    <script src="http://www.youtube.com/player_api"></script>

    <script>

        // create youtube player
        var player;
		var playerId = 'player';
		
        function onYouTubePlayerAPIReady() {
			// Destroy player object
			player = null;
			
			// Remove the div
			removeElement(playerId);
			
			// Create a new name for the new player
			playerId = generateRandomName();
			
			// Get random video ID
			var vid = getRandom(videos);
			
			// Create the video
			createVideo(vid, playerId);
        }

        // autoplay video
        function onPlayerReady(event) {
            event.target.playVideo();
        }

        // when video ends
        function onPlayerStateChange(event) {        
            if(event.data === 0) {          
				onYouTubePlayerAPIReady();
            }
        }

		function getRandom(array) {
			return array[Math.floor(Math.random() * array.length)];
		}

		function createVideo(vidId, playerId) {
			addElement('main', 'div', playerId, '');
            player = new YT.Player(playerId, {
              width: '640',
              height: '390',
              videoId: vidId,
              events: {
                onReady: onPlayerReady,
                onStateChange: onPlayerStateChange
              }
            });
		}
		
		function addElement(parentId, elementTag, elementId, html) {
			// Adds an element to the document
			var p = document.getElementById(parentId);
			var newElement = document.createElement(elementTag);
			newElement.setAttribute('id', elementId);
			newElement.innerHTML = html;
			p.appendChild(newElement);
		}

		function removeElement(elementId) {
			// Removes an element from the document
			var element = document.getElementById(elementId);
			element.parentNode.removeChild(element);
		}
		
		function generateRandomName() {
			var length = 8,
				charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
				retVal = "";
			for (var i = 0, n = charset.length; i < length; ++i) {
				retVal += charset.charAt(Math.floor(Math.random() * n));
			}
			return retVal;
		}
    </script>