用python做youtube自动化下载器 思路
根据 savefrom条例
本实例及教程只用于学习交流用，权利归savefrom.net所有
0. 思路
使用python从savefrom平台上获取指定youtube视频下载链接进行下载，不过savefrom的数据是用javascript加密的，这也是难度所在
本教程主要介绍制作思路，下一篇会介绍制作python
本教程根据stakoverflow 回答制作
1.准备
i.savfrom.net
一个网站可以免费下载youtube视频
2. 探索并规划获取方式
i.总览
打开https://en.savefrom.net/1-youtube-video-downloader-4/可以看见页面主要就一个from表单输入框和提交按钮组成
ii. 获取该网页取到下载url的请求
在chrome或其他浏览器按F12打开开发者控制台，点开Network选项卡
接下来模拟正常的用户流程，在输入框输入一个youtube视频地址，比如这个https://www.youtube.com/watch?v=IjJmTeBSEzU，然后点击Download提交url获取下载url，然后我们可以发现下面已经出现了下载链接。然后我们在network选项卡内可以发现一个特殊的申请saveform.php(如果没发现可以多提交几次，就会发现每次提交都有这个请求或者看html里的form元素的src地址就是savform.php)
我们就可以确定关于下载链接会出现在这个请求的返回值内。
iii. 在本地获取请求
在本地用IDE的http工具或者python构建出post请求代码，笔者用的是pycharm的httpClient(按2下左Shift，然后输入Tools，然后回车进入菜单，然后点击httpClient下的第一个)
把请求里第二个headers的内容全部复制然后格式化然后构建post请求
然后把下面的formdata的参数也复制进来，记得和headers换行
POST https://en.savefrom.net/savefrom.php
cache-Control: no-cache
accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
accept-encoding: gzip, deflate, br
accept-language: zh-CN,zh;q=0.9,en;q=0.8
content-type: application/x-www-form-urlencoded
cookie: lang=en; country=CN; uid=fd94a82a406a8dd4; sfHelperDist=72; reference=14; clickads-e2=90; poropellerAdsPush-e=63; promoBlock=64; helperWidget=92; helperBanner=42; framelessHdConverter=68; inpagePush2=68; popupInOutput=9; _ga=GA1.2.799702638.1610248969; _gid=GA1.2.628904587.1610248969; PHPSESSID=4aojkm49oj7h3de65pekqii337; x-requested-with=; PHPSESSUD=122fb7e10af37e23d99e896fd188744f; _gat_helperWidget=1; _gat_inpagePush2=1
origin: https://en.savefrom.net
pragma: no-cache
referer: https://en.savefrom.net/1-youtube-video-downloader-4/
sec-ch-ua: "Google Chrome";v="87", " Not;A Brand";v="99", "Chromium";v="87"
sec-ch-ua-mobile: ?0
sec-fetch-dest: iframe
sec-fetch-mode: navigate
sec-fetch-site: same-origin
sec-fetch-user: ?1
upgrade-insecure-requests: 1
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
sf_url=https://www.youtube.com/watch?v=YPvtz1lHRiw&sf_submit=&new=1&lang=en&app=&country=cn&os=Windows&browser=Chrome
如果配置没错，这个时候你运行后会显示出和在浏览器里一样的结果，然后可以发现参数里的sf_url就是需要下载的youtube地址
iv.解析请求结果
把取到的结果保存在本地然后在浏览器打开保存的本地文件，然后弹出一个弹窗后会发现这个页面什么都没有，但其实如果你在console输入window会发现有很多变量和函数，其中就有我们需要的加密后的url和解密函数
经过弹窗提示我们可以发现是这个html的js发现了我们不在他的网站上然后删除了显示下载url的代码所以我们才什么都看不到，打开source选项卡或者用IDE打开源代码查看
扫一下这个源代码，我们可以看见一些加密解密函数，被加密的乱码信息，哈希对照表，和一些奇怪的赋值操作，如图
我们可以看见，js部分由一个大闭包组成
- 第3行到第9行是声明函数
- 第10行是给
$b赋值this也就是window - 第11到第13行是赋值3个变量
- 第14，15行是对变量执行一些操作，这个也是我们重点关注的，毕竟执行加密，解密方法只可能在这
第14，15行格式化后如下
this.$d = $d;
this.$a = $a;
this.$e = $e;
this.$k = $k;
this.$c = $c;
$c = _q($c);
$c = _b($c);
_m($b, $c);
去掉前5行没有意义的变量互换值，加密解密函数存在的范围就在最后3行
$c = _q($c);
$c = _b($c);
_m($b, $c);
然后开始一个个试
先在console里输入第一行
然后就出现了明文，所以我们就确定这个是我们需要的解密函数
接下来输入第二行
发现出现了和上面一模一样的明文，所以这个也是解密函数
接下来输入第三行
发现这个执行了那段代码，这个应该是执行函数，所以我们现在就找到了解密函数位于js部分的最后几行
v.解析解密后的结果
把console里用解密函数解密出的结果复制出来会得到一个JavaScript脚本
(function(){
function del(){while(document.body.firstChild){document.body.removeChild(document.body.firstChild);}};
if(window.location.hostname.search(/(?:^|\.|@)(savefrom\.net|sfrom\.net|savefrom\.com\.au|51\.159\.57\.158|(?:fe\d*|test)-front\.sf-apps\.com)$/i) == -1)
{
alert('Please go to http://savefrom.net/ to get direct links');
del();
return;
}
function showResult(){
var success = false;
try
{
var d = window.parent.document;
if(d && d.getElementById)
{
var e = d.getElementById('sf_result');
if(e && e.innerHTML)
{
window.parent.sf.finishRequest(true);;
e.innerHTML = '';
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city"},"thumb":"https:\/\/i.ytimg.com\/vi\/YPvtz1lHRiw\/hqdefault.jpg","itags":["18","22","133","134","135","136","137","140","160","242","243","244","247","248","249","250","251","278"],"video_quality":["1080","720","480","360","240","144"],"url":[{"url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=18&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=H2IuXFgrekwcd2kUgtraypIF&gir=yes&clen=35202709&ratebypass=yes&dur=423.137&lmt=1603720879883261&mt=1610277156&fvip=4&c=WEB&txp=5531422&n=9544-WEiIwBMq_&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRQIgN_iBsjO6zSiW9dcOYYExfjeVuy1YCXtWcKT0cz2kMcECIQCMre2rssbqkWdohk9K4Ej8B8r9gARVc0-kAHVqhV1teQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","name":"MP4","subname":"360","info_url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=18&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=H2IuXFgrekwcd2kUgtraypIF&gir=yes&clen=35202709&ratebypass=yes&dur=423.137&lmt=1603720879883261&mt=1610277156&fvip=4&c=WEB&txp=5531422&n=9544-WEiIwBMq_&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRQIgN_iBsjO6zSiW9dcOYYExfjeVuy1YCXtWcKT0cz2kMcECIQCMre2rssbqkWdohk9K4Ej8B8r9gARVc0-kAHVqhV1teQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","type":"mp4","ext":"mp4","downloadable":false,"quality":"360","audio":false,"no_audio":false,"itag":"18","filesize":35202709,"attr":{"title":"video 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window.parent.sf.enableElement('sf_submit', true);
success=true;
}
}
}
catch(err){}
del();
if(!success)
{
var alt = '';
if(alt) alert(alt);
}
}
try {
if (typeof navigator.permissions != 'undefined') {
navigator.permissions.query({name:'notifications'}).then(function(permissionStatus) {
if(Notification.permission === 'denied' && permissionStatus.state === 'prompt') {
} else {
showResult();
}
});
} else {
showResult();
}
}
catch (err) {
showResult();
}
})();
我们可以发现里面有个del()删除函数，这就是为什么我们看不到这一段代码在执行后
因为被window.location.hostname.search(/(?:^|\.|@)(savefrom\.net|sfrom\.net|savefrom\.com\.au|51\.159\.57\.158|(?:fe\d*|test)-front\.sf-apps\.com)$/i) == -1检查出不是在他的网站上跑的所以就执行弹窗和del()把解密后的东西删除了
仔细检查这段代码可以发现这一行
window.parent.sf.videoResult.show({"id":"YPvtz1lHRiw","cipher":false,"meta":{"title":"The Most Genius Plays in Football","source":"https:\/\/www.youtube.com\/watch?v=YPvtz1lHRiw","duration":"7:03","tags":"lionel messi,football tiki taka,football highlight,football team plays,kevin de bruyne,mesut \u00f6zil,paul pogba,cristiano ronaldo,adama traore,luka modric,toni kroos,andres iniesta,kylian mbappe,neymar jr,zlatan ibrahimovic,franck ribery,paulo dybala,philippe coutinho,robert lewandowski,barcelona,real madrid,liverpool,manchester city"},"thumb":"https:\/\/i.ytimg.com\/vi\/YPvtz1lHRiw\/hqdefault.jpg","itags":["18","22","133","134","135","136","137","140","160","242","243","244","247","248","249","250","251","278"],"video_quality":["1080","720","480","360","240","144"],"url":[{"url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=18&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=H2IuXFgrekwcd2kUgtraypIF&gir=yes&clen=35202709&ratebypass=yes&dur=423.137&lmt=1603720879883261&mt=1610277156&fvip=4&c=WEB&txp=5531422&n=9544-WEiIwBMq_&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRQIgN_iBsjO6zSiW9dcOYYExfjeVuy1YCXtWcKT0cz2kMcECIQCMre2rssbqkWdohk9K4Ej8B8r9gARVc0-kAHVqhV1teQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","name":"MP4","subname":"360","info_url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=18&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=H2IuXFgrekwcd2kUgtraypIF&gir=yes&clen=35202709&ratebypass=yes&dur=423.137&lmt=1603720879883261&mt=1610277156&fvip=4&c=WEB&txp=5531422&n=9544-WEiIwBMq_&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRQIgN_iBsjO6zSiW9dcOYYExfjeVuy1YCXtWcKT0cz2kMcECIQCMre2rssbqkWdohk9K4Ej8B8r9gARVc0-kAHVqhV1teQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","type":"mp4","ext":"mp4","downloadable":false,"quality":"360","audio":false,"no_audio":false,"itag":"18","filesize":35202709,"attr":{"title":"video format: 360","class":""},"info_token":"0c41b67f74ccb97e50f2e64fe5f4625a"},{"url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=22&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=H2IuXFgrekwcd2kUgtraypIF&ratebypass=yes&dur=423.137&lmt=1603723118280830&mt=1610277156&fvip=4&c=WEB&txp=5535432&n=9544-WEiIwBMq_&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRQIgWg_KEKuXDFH-OcphoOxU2tjE9B0WnidilKpa-vtbmigCIQD-eJlhFHZMi1VzRYI_jh0RZaMiLkkXYWnwGM2TJp0bLA%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D&title=The%20Most%20Genius%20Plays%20in%20Football","name":"MP4","subname":"720","info_url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=22&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=H2IuXFgrekwcd2kUgtraypIF&ratebypass=yes&dur=423.137&lmt=1603723118280830&mt=1610277156&fvip=4&c=WEB&txp=5535432&n=9544-WEiIwBMq_&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRQIgWg_KEKuXDFH-OcphoOxU2tjE9B0WnidilKpa-vtbmigCIQD-eJlhFHZMi1VzRYI_jh0RZaMiLkkXYWnwGM2TJp0bLA%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","type":"mp4","ext":"mp4","downloadable":true,"quality":"720","audio":false,"no_audio":false,"itag":"22","attr":{"title":"video format: 720","class":""},"info_token":"674fa89ee246148990b3f36e750a5d32"},{"url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=137&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=QmTnf2BHCkCLm1nUC3OlqIwF&gir=yes&clen=177708494&dur=422.999&lmt=1603723164407782&mt=1610277156&fvip=4&keepalive=yes&c=WEB&txp=5535432&n=TD5jnO4_esWW9m&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhANMFMA1ypwGQjiGT_DlqlYwfqcqu1IlKZGoCrdIqWmzHAiAyOJJHIzUBcMQ6WBeEnepV4UlD3TY6rGSNKBVSVhbpIQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","name":"MP4","subname":"1080","info_url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=137&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fmp4&ns=QmTnf2BHCkCLm1nUC3OlqIwF&gir=yes&clen=177708494&dur=422.999&lmt=1603723164407782&mt=1610277156&fvip=4&keepalive=yes&c=WEB&txp=5535432&n=TD5jnO4_esWW9m&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhANMFMA1ypwGQjiGT_DlqlYwfqcqu1IlKZGoCrdIqWmzHAiAyOJJHIzUBcMQ6WBeEnepV4UlD3TY6rGSNKBVSVhbpIQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","type":"mp4 dash","ext":"mp4","downloadable":false,"quality":"1080","audio":false,"no_audio":true,"itag":"137","filesize":177708494,"attr":{"title":"video format: 1080 (without audio)","class":"no-audio"},"info_token":"6816215e43020185bb429874c33f1f73"},{"url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=248&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fwebm&ns=QmTnf2BHCkCLm1nUC3OlqIwF&gir=yes&clen=117037047&dur=422.999&lmt=1603725149388225&mt=1610277156&fvip=4&keepalive=yes&c=WEB&txp=5535432&n=TD5jnO4_esWW9m&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRgIhANFyBfTGjhDMawSTzN1NjLLYLztYc8e6w3lXVXY5ldbxAiEA-UBT6Yb33Sr0Yhan0x9xlf1xVWFH-wu_y2HsgWkiuXo%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","name":"WEBM","subname":"1080","info_url":"https:\/\/r4---sn-25glene7.googlevideo.com\/videoplayback?expire=1610299253&ei=FeP6X7qLJvesxN8PteeBaA&ip=154.72.187.26&id=o-AFTOjos_M4e5ymyJ3pa8Zs6JxHQohnez1oxdyfxNGuFl&itag=248&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&source=youtube&requiressl=yes&mh=nS&mm=31%2C29&mn=sn-25glene7%2Csn-25ge7nzs&ms=au%2Crdu&mv=m&mvi=4&pl=20&initcwndbps=182500&vprv=1&mime=video%2Fwebm&ns=QmTnf2BHCkCLm1nUC3OlqIwF&gir=yes&clen=117037047&dur=422.999&lmt=1603725149388225&mt=1610277156&fvip=4&keepalive=yes&c=WEB&txp=5535432&n=TD5jnO4_esWW9m&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRgIhANFyBfTGjhDMawSTzN1NjLLYLztYc8e6w3lXVXY5ldbxAiEA-UBT6Yb33Sr0Yhan0x9xlf1xVWFH-wu_y2HsgWkiuXo%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhALlbQJhLhsKk9tVJdpd0OfXwuiWC26m4cDjWZ8MvxO1MAiEA8EG4gFtyQVAWXRWz_d3DYsCTY4oCiTobXSHKnemPR38%3D","type":"webm dash","ext":"webm","downloadable":false,"quality":"1080","audio":false,"no_audio":true,"itag":"248","filesize":117037047,"attr":{"title":"video format: 1080 (without audio)","class":"no-audio"},"info_token":"43e803aa40437c9930975615121cc2c5"}],"hosting":101,"srv":"s30","sd":null,"hd":null});;
这里面有一长串json文本然后里面就包含我们要的下载链接和其他杂七杂八的东西，在json格式化平台(比如bejson)把这一段json文本输入
可以发现meta主要是视频消息，然后url下就是不同分辨率的视频下载链接了
下一章会讲怎么制作自动python程序
-EOF-
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