Download Subtitles
目前为
// ==UserScript==
// @name Youtube Subtitle Downloader v32
// @include https://*youtube.com/*
// @author Cheng Zheng
// @copyright 2009 Tim Smart; 2011 gw111zz; 2014~2021 Cheng Zheng;
// @license GNU GPL v3.0 or later. http://www.gnu.org/copyleft/gpl.html
// @require https://code.jquery.com/jquery-1.12.4.min.js
// @version 32
// @grant GM_xmlhttpRequest
// @namespace https://greasyfork.org/users/5711
// @description Download Subtitles
// ==/UserScript==
/*
[What is this?]
This Tampermonkey script allows you to download Youtube "Automatic subtitle" and "closed subtitle".
[Note]
If it doesn't work (rarely), try to refresh the page.
If problem still exists after refreshing, send an email to [email protected].
[Who built this?]
Author : Cheng Zheng (郑诚)
Email : [email protected]
Github : https://github.com/1c7/Youtube-Auto-Subtitle-Download
If you want to improve the script, Github pull requests are welcome.
[Note for Developers]
Few things before you read the code:
0. Some comments are written in Chinese.
1. Youtube has 2 interfaces: Material Design and The Old Design.
2. This code handles both "Auto" and "Closed" subtitles.
[What is "Tampermonkey"?]
"Tampermonkey script" means that you needs to install a browser extension called "Tampermonkey" before installing this script.
Tempermonkey is available for most modern web browsers, such as Chrome, Firefox, Safari, Microsoft Edge, and Opera.
[Test Video]
https://www.youtube.com/watch?v=bkVsus8Ehxs
This videos only has a closed English subtitle, with no auto subtitles.
https://www.youtube.com/watch?v=-WEqFzyrbbs
no subtitle at all
https://www.youtube.com/watch?v=9AzNEG1GB-k
have a lot of subtitles
https://www.youtube.com/watch?v=tqGkOvrKGfY
1:36:33 super long subtitle
[How does it work?]
The code can be roughly divided into three parts:
1. Add a button on the page. (UI)
2. Detect if subtitle exists.
3. Convert subtitle format, then download.
[Test Enviroment]
Works best on Chrome + Tampermonkey.
There are plenty Chromium-based Browser, I do not guarantee this work on all of them;
个别情况下不能用是因为 jQuery 的 CDN 无法载入，解决办法是修改这一行
// @require https://code.jquery.com/jquery-1.12.4.min.js
改成一个别的 jQuery 地址，比如
https://cdn.bootcdn.net/ajax/libs/jquery/1.12.4/jquery.js
https://cdn.staticfile.org/jquery/1.12.4/jquery.min.js
*/
(function () {
// Config
var NO_SUBTITLE = 'No Subtitle';
var HAVE_SUBTITLE = 'Download Subtitles';
var TEXT_LOADING = 'Loading...';
const BUTTON_ID = 'youtube-subtitle-downloader-by-1c7-last-update-2021-2-21'
// Config
var HASH_BUTTON_ID = `#${BUTTON_ID}`
// initialize
var first_load = true; // indicate if first load this webpage or not
var youtube_playerResponse_1c7 = null; // for auto subtitle
unsafeWindow.caption_array = []; // store all subtitle
// trigger when first load
$(document).ready(function () {
start();
});
// Explain this function: we repeatly try if certain HTML element exist,
// if it does, we call init()
// if it doesn't, stop trying after certain time
function start() {
var retry_count = 0;
var RETRY_LIMIT = 30;
// use "setInterval" is because "$(document).ready()" still not enough, still too early
// 330 work for me.
if (new_material_design_version()) {
var material_checkExist = setInterval(function () {
if (document.querySelectorAll('.title.style-scope.ytd-video-primary-info-renderer').length) {
init();
clearInterval(material_checkExist);
}
retry_count = retry_count + 1;
if (retry_count > RETRY_LIMIT) {
clearInterval(material_checkExist);
}
}, 330);
} else {
var checkExist = setInterval(function () {
if ($('#watch7-headline').length) {
init();
clearInterval(checkExist);
}
retry_count = retry_count + 1;
if (retry_count > RETRY_LIMIT) {
clearInterval(checkExist);
}
}, 330);
}
}
// trigger when loading new page
// (actually this would also trigger when first loading, that's not what we want, that's why we need to use firsr_load === false)
// (new Material design version would trigger this "yt-navigate-finish" event. old version would not.)
var body = document.getElementsByTagName("body")[0];
body.addEventListener("yt-navigate-finish", function (event) {
// 2021-8-9 测试结果：yt-navigate-finish 可以正常触发
if (current_page_is_video_page() === false) {
return;
}
youtube_playerResponse_1c7 = event.detail.response.playerResponse; // for auto subtitle
unsafeWindow.caption_array = []; // clean up (important, otherwise would have more and more item and cause error)
// if use click to another page, init again to get correct subtitle
if (first_load === false) {
remove_subtitle_download_button();
init();
}
});
// return true / false
// Detect [new version UI(material design)] OR [old version UI]
// I tested this, accurated.
function new_material_design_version() {
var old_title_element = document.getElementById('watch7-headline');
if (old_title_element) {
return false;
} else {
return true;
}
}
// return true / false
function current_page_is_video_page() {
return get_url_video_id() !== null;
}
// return string like "RW1ChiWyiZQ", from "https://www.youtube.com/watch?v=RW1ChiWyiZQ"
// or null
function get_url_video_id() {
return getURLParameter('v');
}
//https://stackoverflow.com/questions/11582512/how-to-get-url-parameters-with-javascript/11582513#11582513
function getURLParameter(name) {
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [null, ''])[1].replace(/\+/g, '%20')) || null;
}
function remove_subtitle_download_button() {
$(HASH_BUTTON_ID).remove();
}
function init() {
inject_our_script();
first_load = false;
}
function inject_our_script() {
var div = document.createElement('div'),
select = document.createElement('select'),
option = document.createElement('option'),
controls = document.getElementById('watch7-headline'); // Youtube video title DIV
var css_div = `display: table;
margin-top:4px;
border: 1px solid rgb(0, 183, 90);
cursor: pointer; color: rgb(255, 255, 255);
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
background-color: #00B75A;
`;
div.setAttribute('style', css_div);
div.id = BUTTON_ID;
select.id = 'captions_selector';
select.disabled = true;
let css_select = `display:block;
border: 1px solid rgb(0, 183, 90);
cursor: pointer;
color: rgb(255, 255, 255);
background-color: #00B75A;
padding: 4px;
`;
select.setAttribute('style', css_select);
option.textContent = TEXT_LOADING;
option.selected = true;
select.appendChild(option);
// 下拉菜单里，选择一项后触发下载
select.addEventListener('change', function () {
download_subtitle(this);
}, false);
div.appendChild(select); // put <select> into <div>
// put the div into page: new material design
var title_element = document.querySelectorAll('.title.style-scope.ytd-video-primary-info-renderer');
if (title_element) {
$(title_element[0]).after(div);
}
// put the div into page: old version
if (controls) {
controls.appendChild(div);
}
load_language_list(select);
// <a> element is for download
var a = document.createElement('a');
a.style.cssText = 'display:none;';
a.setAttribute("id", "ForSubtitleDownload");
var body = document.getElementsByTagName('body')[0];
body.appendChild(a);
}
// trigger when user select <option>
async function download_subtitle(selector) {
// if user select first <option>, we just return, do nothing.
if (selector.selectedIndex == 0) {
return;
}
var caption = caption_array[selector.selectedIndex - 1];
// because first <option> is for display, so index - 1
var result = null;
var filename = null; // 保存文件名
// if user choose auto subtitle
if (caption.lang_code == 'AUTO') {
result = await get_auto_subtitle();
filename = get_file_name(get_auto_subtitle_name());
} else {
// closed subtitle
let lang_code = caption.lang_code;
let lang_name = caption.lang_name;
result = await get_closed_subtitle(lang_code);
filename = get_file_name(lang_name);
}
let srt = parse_youtube_XML_to_SRT(result);
downloadString(srt, "text/plain", filename);
// After download, select first <option>
selector.options[0].selected = true;
}
// Return something like: "(English)How Did Python Become A Data Science Powerhouse?.srt"
function get_file_name(x) {
// var method_1 = '(' + x + ')' + document.title + '.srt'; // 如果有通知数，文件名也会带上，比较烦，这种方式不好
// var method_2 = '(' + x + ')' + get_title() + '.srt';
var method_3 = `(${x})${get_title()}_video_id_${get_video_id()}.srt`;
return method_3
}
// 拿完整字幕的 XML
// async function get_closed_subtitles() {
// var list_url = 'https://video.google.com/timedtext?hl=en&v=' + get_url_video_id() + '&type=list';
// // Example: https://video.google.com/timedtext?hl=en&v=if36bqHypqk&type=list
// return new Promise(function (resolve, reject) {
// GM_xmlhttpRequest({
// method: 'GET',
// url: list_url,
// onload: function (xhr) {
// resolve(xhr.responseText)
// }
// })
// })
// }
// detect if "auto subtitle" and "closed subtitle" exist
// and add <option> into <select>
async function load_language_list(select) {
// auto
var auto_subtitle_exist = false;
// closed
var closed_subtitle_exist = false;
// get auto subtitle
var auto_subtitle_url = get_auto_subtitle_xml_url();
if (auto_subtitle_url != false) {
auto_subtitle_exist = true;
}
var captionTracks = get_captionTracks()
if (captionTracks != undefined && typeof captionTracks === 'object' && captionTracks.length > 0) {
closed_subtitle_exist = true;
}
// if no subtitle at all, just say no and stop
if (auto_subtitle_exist == false && closed_subtitle_exist == false) {
select.options[0].textContent = NO_SUBTITLE;
disable_download_button();
return false;
}
// if at least one type of subtitle exist
select.options[0].textContent = HAVE_SUBTITLE;
select.disabled = false;
var option = null; // for <option>
var caption_info = null; // for our custom object
// if auto subtitle exist
if (auto_subtitle_exist) {
caption_info = {
lang_code: 'AUTO', // later we use this to know if it's auto subtitle
lang_name: get_auto_subtitle_name() // for display only
};
caption_array.push(caption_info);
option = document.createElement('option');
option.textContent = caption_info.lang_name;
select.appendChild(option);
}
// if closed_subtitle_exist
if (closed_subtitle_exist) {
for (var i = 0, il = captionTracks.length; i < il; i++) {
var caption = captionTracks[i];
if (caption.kind == 'asr') {
continue
}
let lang_code = caption.languageCode
let lang_translated = caption.name.simpleText
let lang_name = lang_code_to_local_name(lang_code, lang_translated)
caption_info = {
lang_code: lang_code,
lang_name: lang_name,
};
caption_array.push(caption_info);
// 加到 caption_array 里, 一个全局变量, 待会要靠它来下载
option = document.createElement('option');
option.textContent = caption_info.lang_name;
select.appendChild(option);
}
}
}
function disable_download_button() {
$(HASH_BUTTON_ID)
.css('border', '#95a5a6')
.css('cursor', 'not-allowed')
.css('background-color', '#95a5a6');
$('#captions_selector')
.css('border', '#95a5a6')
.css('cursor', 'not-allowed')
.css('background-color', '#95a5a6');
if (new_material_design_version()) {
$(HASH_BUTTON_ID).css('padding', '6px');
} else {
$(HASH_BUTTON_ID).css('padding', '5px');
}
}
// 处理时间. 比如 start="671.33" start="37.64" start="12" start="23.029"
// 处理成 srt 时间, 比如 00:00:00,090 00:00:08,460 00:10:29,350
function process_time(s) {
s = s.toFixed(3);
// 超棒的函数, 不论是整数还是小数都给弄成3位小数形式
// 举个柚子:
// 671.33 -> 671.330
// 671 -> 671.000
// 注意函数会四舍五入. 具体读文档
var array = s.split('.');
// 把开始时间根据句号分割
// 671.330 会分割成数组: [671, 330]
var Hour = 0;
var Minute = 0;
var Second = array[0]; // 671
var MilliSecond = array[1]; // 330
// 先声明下变量, 待会把这几个拼好就行了
// 我们来处理秒数. 把"分钟"和"小时"除出来
if (Second >= 60) {
Minute = Math.floor(Second / 60);
Second = Second - Minute * 60;
// 把 秒 拆成 分钟和秒, 比如121秒, 拆成2分钟1秒
Hour = Math.floor(Minute / 60);
Minute = Minute - Hour * 60;
// 把 分钟 拆成 小时和分钟, 比如700分钟, 拆成11小时40分钟
}
// 分钟，如果位数不够两位就变成两位，下面两个if语句的作用也是一样。
if (Minute < 10) {
Minute = '0' + Minute;
}
// 小时
if (Hour < 10) {
Hour = '0' + Hour;
}
// 秒
if (Second < 10) {
Second = '0' + Second;
}
return Hour + ':' + Minute + ':' + Second + ',' + MilliSecond;
}
// copy from: https://gist.github.com/danallison/3ec9d5314788b337b682
// Thanks! https://github.com/danallison
// work in Chrome 66
// test passed: 2018-5-19
function downloadString(text, fileType, fileName) {
var blob = new Blob([text], {
type: fileType
});
var a = document.createElement('a');
a.download = fileName;
a.href = URL.createObjectURL(blob);
a.dataset.downloadurl = [fileType, a.download, a.href].join(':');
a.style.display = "none";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
setTimeout(function () {
URL.revokeObjectURL(a.href);
}, 1500);
}
// https://css-tricks.com/snippets/javascript/unescape-html-in-js/
// turn HTML entity back to text, example: " should be "
function htmlDecode(input) {
var e = document.createElement('div');
e.class = 'dummy-element-for-tampermonkey-Youtube-Subtitle-Downloader-script-to-decode-html-entity';
e.innerHTML = input;
return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
}
// return URL or null;
// later we can send a AJAX and get XML subtitle
function get_auto_subtitle_xml_url() {
try {
var captionTracks = get_captionTracks()
for (var index in captionTracks) {
var caption = captionTracks[index];
if (caption.kind === 'asr') {
return captionTracks[index].baseUrl;
}
// ASR – A caption track generated using automatic speech recognition.
// https://developers.google.com/youtube/v3/docs/captions
}
return false;
} catch (error) {
return false;
}
}
async function get_auto_subtitle() {
var url = get_auto_subtitle_xml_url();
if (url == false) {
return false;
}
var result = await get(url)
return result
}
async function get_closed_subtitle(lang_code) {
try {
var captionTracks = get_captionTracks()
for (var i in captionTracks) {
var caption = captionTracks[i];
if (caption.languageCode === lang_code && caption.kind != 'asr') {
// 必须写 caption.kind != 'asr'
// 否则会下载2个字幕文件（也就是这个分支会进来2次）
// 因为 lang_code 是 "en" 会 match 2条纪录，一条是自动字幕，一条是完整字幕
// "自动字幕"那条是 kind=asr
// "完整字幕"那条没有 kind 属性
let url = captionTracks[i].baseUrl;
let result = await get(url)
return result
}
}
return false;
} catch (error) {
return false;
}
}
// Youtube return XML. we want SRT
// input: Youtube XML format
// output: SRT format
function parse_youtube_XML_to_SRT(youtube_xml_string) {
if (youtube_xml_string === '') {
return false;
}
var text = youtube_xml_string.getElementsByTagName('text');
var result = '';
var BOM = '\uFEFF';
result = BOM + result; // store final SRT result
var len = text.length;
for (var i = 0; i < len; i++) {
var index = i + 1;
var content = text[i].textContent.toString();
content = content.replace(/(<([^>]+)>)/ig, ""); // remove all html tag.
var start = text[i].getAttribute('start');
var end = parseFloat(text[i].getAttribute('start')) + parseFloat(text[i].getAttribute('dur'));
// 保留这段代码
// 如果希望字幕的结束时间和下一行的开始时间相同（连在一起）
// 可以取消下面的注释
// if (i + 1 >= len) {
// end = parseFloat(text[i].getAttribute('start')) + parseFloat(text[i].getAttribute('dur'));
// } else {
// end = text[i + 1].getAttribute('start');
// }
// we want SRT format:
/*
1
00:00:01,939 --> 00:00:04,350
everybody Craig Adams here I'm a
2
00:00:04,350 --> 00:00:06,720
filmmaker on YouTube who's digging
*/
var new_line = "\n";
result = result + index + new_line;
// 1
var start_time = process_time(parseFloat(start));
var end_time = process_time(parseFloat(end));
result = result + start_time;
result = result + ' --> ';
result = result + end_time + new_line;
// 00:00:01,939 --> 00:00:04,350
content = htmlDecode(content);
// turn HTML entity back to text. example: ' back to apostrophe (')
result = result + content + new_line + new_line;
// everybody Craig Adams here I'm a
}
return result;
}
// return "English (auto-generated)" or a default name;
function get_auto_subtitle_name() {
try {
var captionTracks = get_captionTracks();
for (var index in captionTracks) {
var caption = captionTracks[index];
if (typeof caption.kind === 'string' && caption.kind == 'asr') {
return captionTracks[index].name.simpleText;
}
}
return 'Auto Subtitle';
} catch (error) {
return 'Auto Subtitle';
}
}
// return player_response or return null
// function get_json() {
// var json = null
// try {
// // 如果有缓存，返回缓存
// if (typeof youtube_playerResponse_1c7 !== "undefined" && youtube_playerResponse_1c7 !== null && youtube_playerResponse_1c7 !== '') {
// json = youtube_playerResponse_1c7;
// }
// // 尝试方法1
// if (ytplayer.config.args.player_response) {
// let raw_string = ytplayer.config.args.player_response;
// json = JSON.parse(raw_string);
// }
// // 尝试方法2
// if (ytplayer.config.args.raw_player_response) {
// json = ytplayer.config.args.raw_player_response;
// }
// return json
// } catch (error) {
// return null
// }
// }
function get_youtube_data(){
return document.getElementsByTagName("ytd-app")[0].data.playerResponse
}
function get_captionTracks() {
let data = get_youtube_data();
var captionTracks = data?.captions?.playerCaptionsTracklistRenderer?.captionTracks
return captionTracks
}
// Input a language code, output that language name in current locale
// 如果当前语言是中文简体, Input: "de" Output: 德语
// if current locale is English(US), Input: "de" Output: "Germany"
function lang_code_to_local_name(languageCode, fallback_name) {
try {
var captionTracks = get_captionTracks()
for (var i in captionTracks) {
var caption = captionTracks[i];
if (caption.languageCode === languageCode) {
let simpleText = captionTracks[i].name.simpleText;
if (simpleText) {
return simpleText
} else {
return fallback_name
}
}
}
} catch (error) {
return fallback_name
}
}
// 获取视频标题
function get_title() {
// 方法1：先尝试拿到标题
var title_element = document.querySelector(
"h1.title.style-scope.ytd-video-primary-info-renderer"
);
if (title_element != null) {
var title = title_element.innerText;
// 能拿到就返回
if (title != undefined && title != null && title != "") {
return title;
}
}
// 方法2：如果方法1失效用这个
return ytplayer.config.args.title; // 这个会 delay, 如果页面跳转了，这个获得的标题还是旧的
}
function get_video_id() {
return ytplayer.config.args.video_id;
}
// Usage: var result = await get(url)
function get(url) {
return $.ajax({
url: url,
type: 'get',
success: function (r) {
return r
},
fail: function (error) {
return error
}
});
}
})();