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You can set the start timet to syncronize the media.
// ==UserScript==
// @name Sync media
// @description You can set the start timet to syncronize the media.
// @namespace utubo/syncmedia
// @match https://www.youtube.com/*
// @match https://abema.tv/*
// @version 1.0
// @author -
// @name:ja Sync media
// @description:ja You can set the start timet to syncronize the media.
// ==/UserScript==
(function() {
// ----------
// sync
const INTERVAL = 5000;
const RANGE = 1;
let timer = null;
let startDateTime = null;
const syncVideo = () => {
if (!startDateTime) return;
clearTimeout(timer);
timer = setTimeout(syncVideo, INTERVAL);
let target = null;
if (location.host === 'abema.tv') {
target = document.querySelector('video[preload=metadata]');
} else {
target = document.querySelector('video');
}
if (!target) return;
const syncTime = (Date.now() - startDateTime) / 1000;
if (Math.abs(target.currentTime - syncTime) > RANGE) {
target.currentTime = syncTime;
}
};
// ----------
// ui
const msecToStr = msec => {
const tzoffset = (new Date()).getTimezoneOffset() * 60000;
return new Date(msec - tzoffset)
.toISOString()
.replace('T', ' ')
.replace(/\.\d\d\dZ$/, '');
};
const showDlg = () => {
const val = prompt('⏱Set the start time', msecToStr(startDateTime || Date.now()));
if (val === null) return;
startDateTime = new Date(val).getTime();
syncVideo();
};
addEventListener('keydown', e => {
if (e.altKey && e.key === 's') {
showDlg();
}
});
})();