Opens YouTube links in MPC-BE and automatically loads subtitles
// ==UserScript==
// @name YouTube to MPC-BE with Auto Subtitles
// @namespace http://tampermonkey.net/
// @version 1.4
// @description Opens YouTube links in MPC-BE and automatically loads subtitles
// @author CL
// @match https://*.youtube.com/*
// @match https://youtube.com/*
// @grant GM_xmlhttpRequest
// @grant GM_log
// @connect youtube.com
// @connect googlevideo.com
// @run-at document-end
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// FileSaver.js v1.3.8 implementation
/*
* FileSaver.js
* A saveAs() FileSaver implementation.
*
* By Eli Grey, http://eligrey.com
*
* License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
* source : http://purl.eligrey.com/github/FileSaver.js
*/
var saveAs=saveAs||function(e){"use strict";if(typeof e==="undefined"||typeof navigator!=="undefined"&&/MSIE [1-9]\./.test(navigator.userAgent)){return}var t=e.document,n=function(){return e.URL||e.webkitURL||e},r=t.createElementNS("http://www.w3.org/1999/xhtml","a"),o="download"in r,a=function(e){var t=new MouseEvent("click");e.dispatchEvent(t)},i=/constructor/i.test(e.HTMLElement)||e.safari,f=/CriOS\/[\d]+/.test(navigator.userAgent),u=function(t){(e.setImmediate||e.setTimeout)(function(){throw t},0)},s="application/octet-stream",d=1e3*40,c=function(e){var t=function(){if(typeof e==="string"){n().revokeObjectURL(e)}else{e.remove()}};setTimeout(t,d)},l=function(e,t,n){t=[].concat(t);var r=t.length;while(r--){var o=e["on"+t[r]];if(typeof o==="function"){try{o.call(e,n||e)}catch(a){u(a)}}}},p=function(e){if(/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(e.type)){return new Blob([String.fromCharCode(65279),e],{type:e.type})}return e},v=function(t,u,d){if(!d){t=p(t)}var v=this,w=t.type,m=w===s,y,h=function(){l(v,"writestart progress write writeend".split(" "))},S=function(){if((f||m&&i)&&e.FileReader){var r=new FileReader;r.onloadend=function(){var t=f?r.result:r.result.replace(/^data:[^;]*;/,"data:attachment/file;");var n=e.open(t,"_blank");if(!n)e.location.href=t;t=undefined;v.readyState=v.DONE;h()};r.readAsDataURL(t);v.readyState=v.INIT;return}if(!y){y=n().createObjectURL(t)}if(m){e.location.href=y}else{var o=e.open(y,"_blank");if(!o){e.location.href=y}}v.readyState=v.DONE;h();c(y)};v.readyState=v.INIT;if(o){y=n().createObjectURL(t);setTimeout(function(){r.href=y;r.download=u;a(r);h();c(y);v.readyState=v.DONE});return}S()},w=v.prototype,m=function(e,t,n){return new v(e,t||e.name||"download",n)};if(typeof navigator!=="undefined"&&navigator.msSaveOrOpenBlob){return function(e,t,n){t=t||e.name||"download";if(!n){e=p(e)}return navigator.msSaveOrOpenBlob(e,t)}}w.abort=function(){};w.readyState=w.INIT=0;w.WRITING=1;w.DONE=2;w.error=w.onwritestart=w.onprogress=w.onwrite=w.onabort=w.onerror=w.onwriteend=null;return m}(typeof self!=="undefined"&&self||typeof window!=="undefined"&&window||this.content);if(typeof module!=="undefined"&&module.exports){module.exports.saveAs=saveAs}else if(typeof define!=="undefined"&&define!==null&&define.amd!==null){define("FileSaver.js",function(){return saveAs})}
// Configuration
const config = {
debug: true,
tempDir: 'C:\\Temp' // Default Windows temp directory
};
// Logging function
function log(message, error = false) {
if (config.debug) {
const prefix = error ? '[ERROR]' : '[INFO]';
console.log(`${prefix} ${message}`);
GM_log(`${prefix} ${message}`);
}
}
// Function to fetch video page
function fetchVideoPage(videoId) {
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({
method: 'GET',
url: `https://www.youtube.com/watch?v=${videoId}`,
onload: function(response) {
if (response.status === 200) {
resolve(response.responseText);
} else {
reject(`Failed to fetch video page: ${response.status}`);
}
},
onerror: function(error) {
reject(`Error fetching video page: ${error}`);
}
});
});
}
// Function to fetch subtitles
async function fetchSubtitles(videoId) {
try {
log(`Fetching subtitles for video: ${videoId}`);
const html = await fetchVideoPage(videoId);
// Extract player response data
const ytInitialPlayerResponse = html.match(/ytInitialPlayerResponse\s*=\s*({.+?});/)?.[1];
if (!ytInitialPlayerResponse) {
throw new Error('Could not find player response data');
}
const playerResponse = JSON.parse(ytInitialPlayerResponse);
const captions = playerResponse?.captions?.playerCaptionsTracklistRenderer;
if (!captions) {
throw new Error('No captions found in video data');
}
// Find auto-generated captions
const captionTracks = captions.captionTracks;
if (!captionTracks || captionTracks.length === 0) {
throw new Error('No caption tracks found');
}
// Prefer auto-generated captions
const autoCaption = captionTracks.find(track => track.kind === 'asr') || captionTracks[0];
if (!autoCaption?.baseUrl) {
throw new Error('Could not find auto-generated captions');
}
log('Found caption track URL');
// Fetch the actual subtitle data
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({
method: 'GET',
url: autoCaption.baseUrl,
onload: function(response) {
if (response.status === 200) {
const srtContent = convertToSRT(response.responseText);
resolve(srtContent);
} else {
reject(`Failed to fetch subtitle data: ${response.status}`);
}
},
onerror: function(error) {
reject(`Error fetching subtitle data: ${error}`);
}
});
});
} catch (error) {
log(error.message, true);
throw error;
}
}
// Convert YouTube caption format to SRT
function convertToSRT(subtitleData) {
try {
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(subtitleData, 'text/xml');
const textNodes = xmlDoc.getElementsByTagName('text');
if (!textNodes || textNodes.length === 0) {
throw new Error('No text nodes found in subtitle data');
}
log(`Converting ${textNodes.length} subtitle entries to SRT`);
// First pass: collect all timings
const subtitles = [];
for (let i = 0; i < textNodes.length; i++) {
const node = textNodes[i];
const start = parseFloat(node.getAttribute('start'));
const duration = parseFloat(node.getAttribute('dur')) || 0;
let end = start + duration;
// Clean text content
const text = node.textContent
.replace(/'/g, "'")
.replace(/"/g, '"')
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.trim();
subtitles.push({ start, end, text });
}
// Second pass: adjust timings to prevent overlap
const GAP = 0.01; // 10ms gap between subtitles
for (let i = 0; i < subtitles.length - 1; i++) {
const current = subtitles[i];
const next = subtitles[i + 1];
// If current subtitle ends after next one starts
if (current.end >= next.start) {
// Adjust the end time of current subtitle
current.end = Math.max(current.start, next.start - GAP);
}
}
// Generate SRT content
let srtContent = '';
subtitles.forEach((sub, index) => {
// Only include subtitles that have a positive duration
if (sub.end > sub.start) {
srtContent += (index + 1) + '\n';
srtContent += formatTime(sub.start) + ' --> ' + formatTime(sub.end) + '\n';
srtContent += sub.text + '\n\n';
}
});
return srtContent;
} catch (error) {
log('Error converting to SRT: ' + error.message, true);
throw error;
}
}
// Format time for SRT (00:00:00,000)
function formatTime(seconds) {
const date = new Date(seconds * 1000);
const hh = String(date.getUTCHours()).padStart(2, '0');
const mm = String(date.getUTCMinutes()).padStart(2, '0');
const ss = String(date.getUTCSeconds()).padStart(2, '0');
const ms = String(date.getUTCMilliseconds()).padStart(3, '0');
return `${hh}:${mm}:${ss},${ms}`;
}
// Write SRT file using FileSaver
function writeSRT(content, videoId) {
const filename = `${videoId}.srt`;
const fullPath = `${config.tempDir}\\${filename}`;
const blob = new Blob([content], { type: 'text/plain;charset=utf-8' });
try {
saveAs(blob, filename);
log(`Subtitle file saved: ${fullPath}`);
return fullPath;
} catch (error) {
log(`Error saving file: ${error.message}`, true);
throw error;
}
}
// Extract video ID from URL
function getVideoId(url) {
try {
const urlParams = new URLSearchParams(new URL(url).search);
return urlParams.get('v');
} catch (error) {
log('Error extracting video ID: ' + error.message, true);
return null;
}
}
// Check if URL is a YouTube watch URL
function isYouTubeWatchURL(url) {
return url.includes('youtube.com/watch?') && url.includes('v=');
}
// Handle link clicks
async function handleLinkClick(event) {
const link = event.target.closest('a');
if (!link) return;
const url = link.href;
if (!isYouTubeWatchURL(url)) return;
event.preventDefault();
event.stopPropagation();
const videoId = getVideoId(url);
if (!videoId) {
log('Invalid video ID', true);
return;
}
log(`Processing video: ${videoId}`);
try {
// Fetch and save subtitles
const subtitles = await fetchSubtitles(videoId);
if (subtitles) {
const subtitlePath = writeSRT(subtitles, videoId);
log('Subtitles processed successfully');
// Encode paths for URL
const encodedUrl = encodeURIComponent(url);
const encodedSubPath = encodeURIComponent(subtitlePath);
// Open MPC-BE with video and subtitles
window.location.href = `mpc://${encodedUrl}/sub=${encodedSubPath}`;
}
} catch (error) {
log(`Failed to process subtitles: ${error.message}`, true);
// If subtitle processing fails, still play the video
window.location.href = `mpc://${url}`;
}
}
// Initialize
function initialize() {
// Add click event listener
document.addEventListener('click', handleLinkClick, true);
log('YouTube to MPC-BE script initialized');
}
// Start the script
initialize();
})();