28.js

function speedScrubber() {
    const speed = document.querySelector(".speed");
    const bar = speed.querySelector(".speed-bar");
    const video = document.querySelector(".flex");

    function handleMove(e) {
        const y = e.pageY - this.offsetTop;
        const percent = y / this.offsetHeight;
        const min = 0.5;
        const max = 4;
        const height = Math.round(percent * 100) + "%";
        const playbackRate = percent * (max - min) + min;
        bar.style.height = height;
        bar.textContent = playbackRate.toFixed(2) + "x";
        video.playbackRate = playbackRate;
    }
    speed.addEventListener("mousemove", handleMove);
}
window.addEventListener("DOMContentLoaded", speedScrubber);