entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://www.youtube.com/api/timedtext?v=%257ByoutubeVideoId%257D&asr_langs=de%252Cen%252Ces%252Cfr%252Cid%252Cit%252Cja%252Cko%252Cnl%252Cpt%252Cru%252Ctr%252Cvi&caps=asr&exp=xftt%252Cxctw&xoaf=5&hl=en&ip=0.0.0.0&ipbits=0&expire=1637102374&sparams=ip%252Cipbits%252Cexpire%252Cv%252Casr_langs%252Ccaps%252Cexp%252Cxoaf&signature=0BEBD68A2638D8A18A5BC78E1851D28300247F93.7D5E6D26397D8E8A93F65CCA97260D090C870462&key=yt8&kind=asr&lang=en&fmt=json3|blocks|key|eh640|text|旧的API目前每次请求都会返回404。YouTube现在使用的是这个接口的新版本：|unstyled|depth|inlineStyleRanges|entityRanges|ar9n4|https://www.youtube.com/api/timedtext?v={youtubeVideoId}&asr_langs=de%252Cen%252Ces%252Cfr%252Cid%252Cit%252Cja%252Cko%252Cnl%252Cpt%252Cru%252Ctr%252Cvi&caps=asr&exp=xftt%252Cxctw&xoaf=5&hl=en&ip=0.0.0.0&ipbits=0&expire=1637102374&sparams=ip%252Cipbits%252Cexpire%252Cv%252Casr_langs%252Ccaps%252Cexp%252Cxoaf&signature=0BEBD68A2638D8A18A5BC78E1851D28300247F93.7D5E6D26397D8E8A93F65CCA97260D090C870462&key=yt8&kind=asr&lang=en&fmt=json3|offset|length|1t5ek|此接口的主要问题是计算请求的signature字段。不幸的是，我找不到它的算法。也许有人可以从YouTube播放器中对其进行反向工程。|style|CODE|bvhci^0|0|0|B1|0|0|E|9|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|R|G|@]|H|@]|6|$]]|$A|I|C|J|2|E|F|S|G|@]|H|@$K|T|L|U|A|V]]|6|$]]|$A|M|C|N|2|E|F|W|G|@$K|X|L|Y|O|P]]|H|@]|6|$]]|$A|Q|C|-4|2|E|F|Z|G|@]|H|@]|6|$]]]]

Old API currently returns 404 on every request. And YouTube right now uses new version of this API:
<a href="https://www.youtube.com/api/timedtext?v=%7ByoutubeVideoId%7D&amp;asr_langs=de%2Cen%2Ces%2Cfr%2Cid%2Cit%2Cja%2Cko%2Cnl%2Cpt%2Cru%2Ctr%2Cvi&amp;caps=asr&amp;exp=xftt%2Cxctw&amp;xoaf=5&amp;hl=en&amp;ip=0.0.0.0&amp;ipbits=0&amp;expire=1637102374&amp;sparams=ip%2Cipbits%2Cexpire%2Cv%2Casr_langs%2Ccaps%2Cexp%2Cxoaf&amp;signature=0BEBD68A2638D8A18A5BC78E1851D28300247F93.7D5E6D26397D8E8A93F65CCA97260D090C870462&amp;key=yt8&amp;kind=asr&amp;lang=en&amp;fmt=json3" rel="nofollow noreferrer">https://www.youtube.com/api/timedtext?v={youtubeVideoId}&amp;asr_langs=de%2Cen%2Ces%2Cfr%2Cid%2Cit%2Cja%2Cko%2Cnl%2Cpt%2Cru%2Ctr%2Cvi&amp;caps=asr&amp;exp=xftt%2Cxctw&amp;xoaf=5&amp;hl=en&amp;ip=0.0.0.0&amp;ipbits=0&amp;expire=1637102374&amp;sparams=ip%2Cipbits%2Cexpire%2Cv%2Casr_langs%2Ccaps%2Cexp%2Cxoaf&amp;signature=0BEBD68A2638D8A18A5BC78E1851D28300247F93.7D5E6D26397D8E8A93F65CCA97260D090C870462&amp;key=yt8&amp;kind=asr&amp;lang=en&amp;fmt=json3</a>
The main problem with this API is to calculate the <code>signature</code> field of request. Unfortunately I couldn't find its algorithm. Maybe someone can reverse engineered it form YouTube player.

entityMap|blocks|key|ae504|text|要获取YouTube视频的字幕，只需使用以下Linux命令(使用curl和base64)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6vs4v|curl+-s+'https://www.youtube.com/youtubei/v1/get_transcript?key=AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8'
-X+POST+-H+'Content-Type:+application/json'+--data-raw+"{\"context\":{\"client\":{\"clientName\":\"WEB\",\"clientVersion\":\"2.2021111\"}},\"params\":\"$(printf+'\n\x0bVIDEO_ID'+%7C+base64)\"}"|code-block|syntax|javascript|856vc|将VIDEO_ID参数更改为您感兴趣的参数。|offset|length|style|CODE|3bisl|注意:密钥不是YouTube+Data+API+v3+one，它是第一个公共的(在不同国家的一些计算机上测试过的)，如果你curl+https://www.youtube.com/+%7C+grep+AIzaSy的话|4mn1j^0|0|0|1|8|0|1P|17|0^^$0|$]|1|@$2|3|4|5|6|7|8|Q|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|R|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|S|9|@$J|T|K|U|L|M]]|A|@]|B|$]]|$2|N|4|O|6|7|8|V|9|@$J|W|K|X|L|M]]|A|@]|B|$]]|$2|P|4|-4|6|7|8|Y|9|@]|A|@]|B|$]]]]

Captions in default language (single available or English it seems):
To get captions of a YouTube video just use this Linux command (using curl and base64):
<pre><code>curl -s 'https://www.youtube.com/youtubei/v1/get_transcript?key=AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8' -H 'Content-Type: application/json' --data-raw &quot;{\&quot;context\&quot;:{\&quot;client\&quot;:{\&quot;clientName\&quot;:\&quot;WEB\&quot;,\&quot;clientVersion\&quot;:\&quot;2.2021111\&quot;}},\&quot;params\&quot;:\&quot;$(printf '\n\x0bVIDEO_ID' | base64)\&quot;}&quot;
</code></pre>
Change the <code>VIDEO_ID</code> parameter with the one interesting you.
Note: the key isn't a YouTube Data API v3 one, it is the first public (tested on some computers in different countries) one coming if you <code>curl https://www.youtube.com/ | grep AIzaSy</code>
Note: If interested in how I reverse-engineered this YouTube feature, say it in the comments and I would write a paragraph to explain
Captions in desired language if available:
YouTube made things tricky maybe to lose you at this step, so follow me: the only thing we have to change is the <code>params</code> value which is base64 encoded data which is in addition to weird characters also containing base64 data which also contains weird characters.
<ol>
<li>Get the language initials like &quot;ru&quot; for russian</li>
<li>Encode <code>\n\x00\x12\x02LANGUAGE_INITIALS\x1a\x00</code> in base64 with for instance <code>A=$(printf '\n\x00\x12\x02LANGUAGE_INITIALS\x1a\x00' | base64)</code> (don't forget to change <code>LANGUAGE_INITIALS</code> to your language initials wanted <code>ru</code> for instance). The result for <code>ru</code> is <code>CgASAnJ1GgA=</code></li>
<li>Encode the result as a URL by replacing the <code>=</code> to <code>%3D</code> with for instance <code>B=$(printf %s $A | jq -sRr @uri)</code>. The result for <code>ru</code> is <code>CgASAnJ1GgA%3D</code></li>
<li>Only if using shell commands: replace the single <code>%</code> to two <code>%</code> with for instance <code>C=$(echo $B | sed 's/%/%%/')</code>. The result for <code>ru</code> is <code>CgASAnJ1GgA%%3D</code></li>
<li>Encode <code>\n\x0bVIDEO_ID\x12\x0e$C</code> (don't forget to change <code>VIDEO_ID</code> to your video id, with <code>$C</code> the result of the previous step) with for instance <code>D=$(printf &quot;\n\x0bVIDEO_ID\x12\x0e$C&quot; | base64)</code>. The result for <code>ru</code> and <code>lo0X2ZdElQ4</code> is <code>CgtsbzBYMlpkRWxRNBIOQ2dBU0FuSjFHZ0ElM0Q=</code></li>
<li>Use this <code>params</code> value from the Captions in default language section: <code>curl -s 'https://www.youtube.com/youtubei/v1/get_transcript?key=AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8' -H 'Content-Type: application/json' --data-raw &quot;{\&quot;context\&quot;:{\&quot;client\&quot;:{\&quot;clientName\&quot;:\&quot;WEB\&quot;,\&quot;clientVersion\&quot;:\&quot;2.2021111\&quot;}},\&quot;params\&quot;:\&quot;$D\&quot;}&quot;</code></li>
</ol>

As of 4 days ago, you were able to send a GET request to or visit <a href="https://video.google.com/timedtext?lang=en&amp;v=%7ByoutubeVideoId%7D" rel="noreferrer">https://video.google.com/timedtext?lang=en&amp;v={youtubeVideoId}</a> and receive an xml response containing the caption track of a given youtube video. Does anyone know if this support has been removed, because as of tonight, it no longer provides the xml response with the captions, the page is simply empty for every video. There were numerous videos this worked for 4 days ago that no longer work. Thanks in advance

Google Video no longer able to retrieve captions?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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 4天前，您可以向https://video.google.com/timedtext?lang=en&v={youtubeVideoId}发送GET请求或访问youtube，并接收包含给定youtube视频的字幕轨道的xml响应。有没有人知道这个支持是否被移除了，因为从今晚开始，它不再提供带有字幕的xml响应，每个视...

问谷歌视频不再能够检索字幕了吗？
EN

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问谷歌视频不再能够检索字幕了吗？EN