Set audio/video playback

Set playback Rate.js

function setPlaybackRate(rate) {
  Array.from(document.querySelectorAll('video,audio')).forEach((v) => v.playbackRate = rate);
}

// Mutation observer for interactive UIs
// Select the node that will be observed for mutations
let targetNode = document.body;

// Options for the observer (which mutations to observe)
let config = { attributes: true, childList: true, subtree: true };

// Callback function to execute when mutations are observed
let callback = function(mutationsList, observer) {
    // Use traditional 'for loops' for IE 11
    for(const mutation of mutationsList) {
        if (mutation.type === 'childList') {
            console.log('A child node has been added or removed.');
        }
        else if (mutation.addedNodes.length > 0) {
			const nodes = Array.from(mutation.addedNodes);
            console.log('New nodes', nodes.map((e) => e.tagName));
        }
    }
};

// Create an observer instance linked to the callback function
let observer = new MutationObserver((mutationList, observer) => mutationCallback(mutationList, observer));

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

function mutationCallback(mutationsList, observer) {
    // Use traditional 'for loops' for IE 11
    for(const mutation of mutationsList) {
        if (['AUDIO', 'VIDEO'].includes(mutation.target.tagName)) {
            console.log('Mutation', mutation, 'setting rate');
			setPlaybackRate(1.25);
        }
    }
};