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// ==UserScript==
// @name YouTube auto-timestamper
// @namespace Violentmonkey Scripts
// @match *://www.youtube.com/*
// @grant none
// @version 1.2
// @author -
// @description 12/17/2025, 5:12:31 PM
// ==/UserScript==
// interval in milliseconds
const interval = 1000;
// time before start in ms
const startDelay = 5000;
// regex used for determining url time
const timeRegex = /(([&?])t=[0-9]+)/
// negative time added to the url
const timeDelay = 0;
// how many seconds before the end do we mash the cancel autoplay button
const prefire = 5;
const tick = () => {
const ytplayer = document.getElementById("movie_player");
if (!ytplayer) {
return
}
let shouldPreventAutoplay = false
let time = ytplayer.getCurrentTime();
time = Math.floor(time)
if (time + prefire >= ytplayer.getDuration()) {
shouldPreventAutoplay = true
}
time -= timeDelay
if (time <= 0) {
return
}
if (shouldPreventAutoplay) {
document.querySelector("button[aria-label=\"Cancel autoplay\"]").click()
}
let currentUrl = window.location.href
const baseUrl = window.location.href.replace(timeRegex, "")
if (currentUrl.includes("t=")) {
const match = currentUrl.match(timeRegex, "t=")
currentUrl = currentUrl.replace(timeRegex, match[2] + "t=" + time)
} else {
currentUrl = currentUrl + "&t=" + time
}
history.replaceState(baseUrl, "", currentUrl)
}
console.debug(`autotimestamper will init in ${startDelay/1000}s`)
const script = setTimeout(() => {
setInterval(tick, interval)
console.debug("autotimestamper initialized")
}, startDelay)
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