blocks|key|2515675|text|将&asv=2添加到URL的末尾。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2515676|entityMap^0|1|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Add <code>&amp;asv=2</code> to the end of the URL.

blocks|key|3923693|text|实际上，我正在做一个类似的项目，从youtube下载视频文件。我发现get_video可能被Youtube屏蔽了。因此，我没有使用get_video，而是使用从get_video_info检索到的视频信息并提取它来获得视频文件的url。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3923694|在get_video_info中，有url_encoded_fmt_stream_map。编码后，可以找到不同格式的每个视频的url和签名值。因此，文件url类似于url+value+%2B‘&sig=’%2Bsig+value。|3923695|另外，我发现下面的主题与我的使用相同的方法。希望能对你有所帮助。|3923696|Can't+Download+from+youtube|offset|length|3923697|如果你对如何下载youtube视频文件感兴趣，有一个我写的小程序来演示这个过程。你可以自由地使用它。|3923698|https://github.com/johnny0614/YoutubeVideoDownload|3923699|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4397584/cant-download-from-youtube|1^0|0|0|0|0|R|0|0|0|0|1E|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@$H|10|I|11|1|12]]|A|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@$H|15|I|16|1|17]]|A|$]]|$1|N|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]|V|$5|Q|R|S|A|$T|M]]]]

Actually I'm working on the similar project that downloading the video file from youtube. I find that the get_video might be blocked by Youtube. so instead of using get_video., I use the video info retrieved from get_video_info and extract it to get the video file url. 

Within the get_video_info, there are url_encoded_fmt_stream_map. After encoding it, you can find url and signature value of every video with different format. So the file url is like [url value]+'&amp;signature='+[sig value].

Additionally I find the following topic that using same method with mine. Hope it can help you. 

<a href="https://stackoverflow.com/questions/4397584/cant-download-from-youtube">Can&#39;t Download from youtube</a>

If you are interested about how to downloading youtube video file, there is a small program written by me to demonstrate the process. You are free to use it.

<a href="https://github.com/johnny0614/YoutubeVideoDownload" rel="nofollow noreferrer">https://github.com/johnny0614/YoutubeVideoDownload</a>

blocks|key|1519157|text|您可以使用以下命令直接获取流|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1519158|1519159|+http://www.youtube.com/get_video_info?video_id=jN0nWjvzeNc|blockquote|offset|length|1519160|1519161|1519162|我做了一个小脚本，在PHP中播放youtube视频。看看脚本是如何获取视频文件的。|1519163|<?php+
@set_time_limit(0);+
$id+=+$_GET['id'];+//The+youtube+video+ID
$type+=+$_GET['type'];+//the+MIME+type+of+the+video

parse_str(file_get_contents('http://www.youtube.com/get_video_info?video_id='.$id),$info);+
$streams+=+explode(',',$info['url_encoded_fmt_stream_map']);+

foreach($streams+as+$stream){+
++++parse_str($stream,$real_stream);+
++++$stype+=+$real_stream['type'];+
++++if(strpos($real_stream['type'],';')+!==+false){+
++++++++$tmp+=+explode(';',$real_stream['type']);+
++++++++$stype+=+$tmp[0];+
++++++++unset($tmp);+
++++}+
++++if($stype+==+$type+&&+($real_stream['quality']+==+'large'+%7C%7C+$real_stream['quality']+==+'medium'+%7C%7C+$real_stream['quality']+==+'small')){+
++++++++header('Content-type:+'.$stype);+
++++++++header('Transfer-encoding:+chunked');+
++++++++@readfile($real_stream['url'].'&signature='.$real_stream['sig']);+//Change+here+to+do+other+things+such+as+save+the+file+to+the+filesystem+etc.
++++++++ob_flush();+
++++++++flush();+
++++++++break;+
++++}+
}
?>|code-block|syntax|javascript|1519164|请参阅有效的演示here。我希望这能对你有所帮助。|1519165|entityMap|0|LINK|mutability|MUTABLE|url|http://www.youtube.com/get_video_info?video_id=jN0nWjvzeNc|1|http://licson-php.hp.af.cm/stream-youtube-videos/^0|0|0|1|1M|0|0|0|0|0|0|8|4|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|14|8|@]|9|@$F|15|G|16|1|17]]|A|$]]|$1|H|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1A|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1B|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1C|8|@]|9|@$F|1D|G|1E|1|1F]]|A|$]]|$1|S|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

You can get the stream directly by using only 

<blockquote>
 <a href="http://www.youtube.com/get_video_info?video_id=jN0nWjvzeNc">http://www.youtube.com/get_video_info?video_id=jN0nWjvzeNc</a>
</blockquote>

I made a little script to stream youtube videos in PHP. See how the script get the video file.

<pre><code>&lt;?php 
@set_time_limit(0); 
$id = $_GET['id']; //The youtube video ID
$type = $_GET['type']; //the MIME type of the video

parse_str(file_get_contents('http://www.youtube.com/get_video_info?video_id='.$id),$info); 
$streams = explode(',',$info['url_encoded_fmt_stream_map']); 

foreach($streams as $stream){ 
 parse_str($stream,$real_stream); 
 $stype = $real_stream['type']; 
 if(strpos($real_stream['type'],';') !== false){ 
 $tmp = explode(';',$real_stream['type']); 
 $stype = $tmp[0]; 
 unset($tmp); 
 } 
 if($stype == $type &amp;&amp; ($real_stream['quality'] == 'large' || $real_stream['quality'] == 'medium' || $real_stream['quality'] == 'small')){ 
 header('Content-type: '.$stype); 
 header('Transfer-encoding: chunked'); 
 @readfile($real_stream['url'].'&amp;signature='.$real_stream['sig']); //Change here to do other things such as save the file to the filesystem etc.
 ob_flush(); 
 flush(); 
 break; 
 } 
}
?&gt;
</code></pre>

See the working demo <a href="http://licson-php.hp.af.cm/stream-youtube-videos/">here</a>. I hope this can help you.

blocks|key|3923762|text|上一次我正在修复一个坏掉的Chrome扩展来下载YouTube视频。我通过修改脚本部分修复了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3923763|(Javascript)|3923764|var+links+=+new+String();
var+downlink+=+new+String();
var+has22+=+new+Boolean();
has22+=+false;
var+Marked+=+false;

var+FMT_DATA+=+fmt_url_map;//This+is+html+text+that+you+have+to+grab.+In+case+of+extension+it+was+readily+available+through:document.getElementsByTagName('script');

var+StrSplitter1+=+'%252C',+StrSplitter2+=+'%2526',+StrSplitter3+=+'%253D';
if+(FMT_DATA.indexOf(',')+>+-1)+{+//Found+,
++++StrSplitter1+=+',';
++++StrSplitter2+=+(FMT_DATA.indexOf('&')+>+-1)+?+'&'+:+'\\u0026';
++++StrSplitter3+=+'=';
}

var+videoURL+=+new+Array();
var+FMT_DATA_PACKET+=+new+Array();
var+FMT_DATA_PACKET+=+FMT_DATA.split(StrSplitter1);

for+(var+i+=+0;+i+<+FMT_DATA_PACKET.length;+i%2B%2B)+{
++++var+FMT_DATA_FRAME+=+FMT_DATA_PACKET[i].split(StrSplitter2);
++++var+FMT_DATA_DUEO+=+new+Array();

++++for+(var+j+=+0;+j+<+FMT_DATA_FRAME.length;+j%2B%2B)+{
++++++++var+pair+=+FMT_DATA_FRAME[j].split(StrSplitter3);
++++++++if+(pair.length+==+2)+{
++++++++++++FMT_DATA_DUEO[pair[0]]+=+pair[1];
++++++++}
++++}

++++var+url+=+(FMT_DATA_DUEO['url'])+?+FMT_DATA_DUEO['url']+:+null;

++++if+(url+==+null)+continue;
++++url+=+unescape(unescape(url)).replace(/\\\//g,+'/').replace(/\\u0026/g,+'&');
++++var+itag+=+(FMT_DATA_DUEO['itag'])+?+FMT_DATA_DUEO['itag']+:+null;
++++var+itag+=+(FMT_DATA_DUEO['itag'])+?+FMT_DATA_DUEO['itag']+:+null;
++++if+(itag+==+null)+continue;
++++var+signature+=+(FMT_DATA_DUEO['sig'])+?+FMT_DATA_DUEO['sig']+:+null;
++++if+(signature+!=+null)+{
++++++++url+=+url+%2B+"&signature="+%2B+signature;
++++}
++++if+(url.toLowerCase().indexOf('http')+==+0)+{+//+validate+URL+

++++++++if+(itag+==+'5')+{
++++++++++++links+%2B=+'<a+href="'+%2B+url+%2B+'&title='+%2B+username+%2B+title+%2B+quality240+%2B+'"style="text-decoration:none"><span+class="yt-uix-button-menu-item"+id="v240p">FLV+(240p)</a>';
++++++++}
++++++++if+(itag+==+'18')+{
++++++++++++links+%2B=+'<a+href="'+%2B+url+%2B+'&title='+%2B+username+%2B+title+%2B+quality360+%2B+'"style="text-decoration:none"><span+class="yt-uix-button-menu-item"+id="v360p">MP4+(360p)</a>';
++++++++}
++++++++if+(itag+==+'35')+{
++++++++++++links+%2B=+'<a+href="'+%2B+url+%2B+'&title='+%2B+username+%2B+title+%2B+quality480+%2B+'"style="text-decoration:none"><span+class="yt-uix-button-menu-item"+id="v480p">FLV+(480p)</a>';
++++++++}
++++++++if+(itag+==+'22')+{
++++++++++++links+%2B=+'<a+href="'+%2B+url+%2B+'&title='+%2B+username+%2B+title+%2B+quality720+%2B+'"style="text-decoration:none"><span+class="yt-uix-button-menu-item"+id="v720p">MP4+HD+(720p)</a>';
++++++++}
++++++++if+(itag+==+'37')+{
++++++++++++links+%2B=+'+<a+href="'+%2B+url+%2B+'&title='+%2B+username+%2B+title+%2B+quality1080+%2B+'"style="text-decoration:none"><span+class="yt-uix-button-menu-item"+id="v1080p">MP4+HD+(1080p)</a>';
++++++++}
++++++++if+(itag+==+'38')+{
++++++++++++links+%2B=+'<a+href="'+%2B+url+%2B+'&title='+%2B+username+%2B+title+%2B+quality4k+%2B+'"style="text-decoration:none"><span+class="yt-uix-button-menu-item"++id="v4k">MP4+HD+(4K)</a>';
++++++++}

++++++++FavVideo();
++++++++videoURL[itag]+=+url;
++++++++console.log(itag);
++++}
}|code-block|syntax|javascript|3923765|您可以从videoURL[itag]阵列获得单独的视频链接。|offset|length|style|CODE|3923766|该扩展可以从here下载。|3923767|我希望这能帮助到一些人。这是工作解决方案(截至2013年4月6日)|3923768|entityMap|0|LINK|mutability|MUTABLE|url|http://www.figmentsol.com/chrome/ytdw/^0|0|0|0|4|E|0|6|4|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@$K|14|L|15|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@$K|17|L|18|1|19]]|A|$]]|$1|Q|3|R|5|6|7|1A|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

Last time I was working on fixing one of the broken Chrome extensions to download YouTube video. I fixed it by altering the script part.

(Javascript)

<pre><code>var links = new String();
var downlink = new String();
var has22 = new Boolean();
has22 = false;
var Marked = false;

var FMT_DATA = fmt_url_map;//This is html text that you have to grab. In case of extension it was readily available through:document.getElementsByTagName('script');

var StrSplitter1 = '%2C', StrSplitter2 = '%26', StrSplitter3 = '%3D';
if (FMT_DATA.indexOf(',') &gt; -1) { //Found ,
 StrSplitter1 = ',';
 StrSplitter2 = (FMT_DATA.indexOf('&amp;') &gt; -1) ? '&amp;' : '\\u0026';
 StrSplitter3 = '=';
}

var videoURL = new Array();
var FMT_DATA_PACKET = new Array();
var FMT_DATA_PACKET = FMT_DATA.split(StrSplitter1);

for (var i = 0; i &lt; FMT_DATA_PACKET.length; i++) {
 var FMT_DATA_FRAME = FMT_DATA_PACKET[i].split(StrSplitter2);
 var FMT_DATA_DUEO = new Array();

 for (var j = 0; j &lt; FMT_DATA_FRAME.length; j++) {
 var pair = FMT_DATA_FRAME[j].split(StrSplitter3);
 if (pair.length == 2) {
 FMT_DATA_DUEO[pair[0]] = pair[1];
 }
 }

 var url = (FMT_DATA_DUEO['url']) ? FMT_DATA_DUEO['url'] : null;

 if (url == null) continue;
 url = unescape(unescape(url)).replace(/\\\//g, '/').replace(/\\u0026/g, '&amp;');
 var itag = (FMT_DATA_DUEO['itag']) ? FMT_DATA_DUEO['itag'] : null;
 var itag = (FMT_DATA_DUEO['itag']) ? FMT_DATA_DUEO['itag'] : null;
 if (itag == null) continue;
 var signature = (FMT_DATA_DUEO['sig']) ? FMT_DATA_DUEO['sig'] : null;
 if (signature != null) {
 url = url + "&amp;signature=" + signature;
 }
 if (url.toLowerCase().indexOf('http') == 0) { // validate URL 

 if (itag == '5') {
 links += '&lt;a href="' + url + '&amp;title=' + username + title + quality240 + '"style="text-decoration:none"&gt;&lt;span class="yt-uix-button-menu-item" id="v240p"&gt;FLV (240p)&lt;/span&gt;&lt;/a&gt;';
 }
 if (itag == '18') {
 links += '&lt;a href="' + url + '&amp;title=' + username + title + quality360 + '"style="text-decoration:none"&gt;&lt;span class="yt-uix-button-menu-item" id="v360p"&gt;MP4 (360p)&lt;/span&gt;&lt;/a&gt;';
 }
 if (itag == '35') {
 links += '&lt;a href="' + url + '&amp;title=' + username + title + quality480 + '"style="text-decoration:none"&gt;&lt;span class="yt-uix-button-menu-item" id="v480p"&gt;FLV (480p)&lt;/span&gt;&lt;/a&gt;';
 }
 if (itag == '22') {
 links += '&lt;a href="' + url + '&amp;title=' + username + title + quality720 + '"style="text-decoration:none"&gt;&lt;span class="yt-uix-button-menu-item" id="v720p"&gt;MP4 HD (720p)&lt;/span&gt;&lt;/a&gt;';
 }
 if (itag == '37') {
 links += ' &lt;a href="' + url + '&amp;title=' + username + title + quality1080 + '"style="text-decoration:none"&gt;&lt;span class="yt-uix-button-menu-item" id="v1080p"&gt;MP4 HD (1080p)&lt;/span&gt;&lt;/a&gt;';
 }
 if (itag == '38') {
 links += '&lt;a href="' + url + '&amp;title=' + username + title + quality4k + '"style="text-decoration:none"&gt;&lt;span class="yt-uix-button-menu-item" id="v4k"&gt;MP4 HD (4K)&lt;/span&gt;&lt;/a&gt;';
 }

 FavVideo();
 videoURL[itag] = url;
 console.log(itag);
 }
}
</code></pre>

You can get separate video link from <code>videoURL[itag]</code> array.

The extension can be downloaded from <a href="http://www.figmentsol.com/chrome/ytdw/" rel="nofollow">here</a>.

I hope this would help someone. This is working solution (as of 06-Apr-2013)

blocks|key|2515834|text|在多次尝试失败之后，这个github存储库帮助了我：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2515835|https://github.com/rg3/youtube-dl|offset|length|2515836|只需像这样获取url：|2515837|youtube-dl+'https://www.youtube.com/watch?v=bo_efYhYU2A'+--get-url|style|CODE|2515838|下载mp4并另存为a.mp4，如下所示：|2515839|youtube-dl+'https://www.youtube.com/watch?v=bo_efYhYU2A'+-f+mp4+-o+a.mp4|2515840|祝好运。|2515841|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|X|0|0|0|0|1U|0|0|0|20|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@$D|15|E|16|J|K]]|9|@]|A|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|18|8|@$D|19|E|1A|J|K]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1B|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|C]]]]

After a lot of failed tries, this github repositories help me:

<a href="https://github.com/rg3/youtube-dl" rel="noreferrer">https://github.com/rg3/youtube-dl</a>

Get the url only like:

<code>youtube-dl 'https://www.youtube.com/watch?v=bo_efYhYU2A' --get-url</code>

download an mp4 and save as a.mp4 like:

<code>youtube-dl 'https://www.youtube.com/watch?v=bo_efYhYU2A' -f mp4 -o a.mp4</code>

Good luck.

I wrote a program that gets youtube video URL and downloads it 
Up today I did this: 
1. get video "token" from "/get_video_info?video_id=ID" like: 

<pre><code>http://www.youtube.com/get_video_info?video_id=jN0nWjvzeNc 
</code></pre>

2. Download Video by requesting it from "/get_video?video_id=ID&amp;t=TOKEN&amp;fmt=FORMAT_ID" like: 

<pre><code>http://www.youtube.com/get_video?video_id=jN0nWjvzeNc&amp;t=vjVQa1PpcFMgAK0HB1VRbinpVOwm29eGugPh3fBi6Dg%3D&amp;fmt=18 
</code></pre>

But this doesn't work anymore! 
What is the new download URL?

Thanks

Youtube video download URL

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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我写了一个获取youtube视频URL并下载的程序今天我做了这样的事情：从"/get_video_info?video_id=ID“获取视频"token”，喜欢：http://www.youtube.com/get_video_info?video_id=jN0nWjvzeNc  从"/get_video?video_...

问Youtube视频下载URL
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