如何获取YouTube视频的直接网址

Question

关于制作自己的YouTube视频下载器的所有当前教程都已过时.视频信息中的整个令牌插入不起作用,也没有使用javascript方法.有没有人知道如何做到这一点,而不只是下载别人的程序？我只是想知道方法,所以我可以自己编程(为了好玩:D)

提前致谢!

Answer 1

截至2014年1月1日,下面描述的旧技术似乎不可靠.Youtube的页内变量结构似乎已经改变,我无法弄清楚更新版本.

这是一个更新的(2017年6月)版本,可直接在任何浏览器中提供的开发工具控制台上运行.目前应该适用于任何Youtube媒体类型,包括最多4k(如果可用).

https://gist.github.com/geuis/8b1b2ea57d7f9a9ae22f80d4fbf5b97f

// ES6 version
const videoUrls = ytplayer.config.args.adaptive_fmts
  .split(',')
  .map(item => item
    .split('&')
    .reduce((prev, curr) => (curr = curr.split('='),
      Object.assign(prev, {[curr[0]]: decodeURIComponent(curr[1])})
    ), {})
  )
  .reduce((prev, curr) => Object.assign(prev, {
    [curr.quality_label || curr.type]: curr
  }), {});

console.log(videoUrls);

// ES5 version
var videoUrls = ytplayer.config.args.adaptive_fmts
  .split(',')
  .map(function (item) {
    return item
      .split('&')
      .reduce(function (prev, curr) {
        curr = curr.split('=');
        return Object.assign(prev, {[curr[0]]: decodeURIComponent(curr[1])})
      }, {});
  })
  .reduce(function (prev, curr) {
    return Object.assign(prev, {
      [curr.quality_label || curr.type]: curr
    });
  }, {});

console.log(videoUrls);

https://www.youtube.com/watch?v=9bZkp7q19f0的示例输出

{
  "1080p": {
    "itag": "248",
    "xtags": "",
    "lmt": "1440215955569849",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=248&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "video/webm;+codecs=\"vp9\"",
    "bitrate": "1733724",
    "index": "243-1977",
    "size": "1920x1080",
    "projection_type": "1",
    "fps": "30",
    "clen": "31192903",
    "init": "0-242",
    "quality_label": "1080p"
  },
  "720p": {
    "itag": "247",
    "xtags": "",
    "lmt": "1440215905109639",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=247&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "video/webm;+codecs=\"vp9\"",
    "bitrate": "726076",
    "index": "243-1933",
    "size": "1280x720",
    "projection_type": "1",
    "fps": "30",
    "clen": "15801933",
    "init": "0-242",
    "quality_label": "720p"
  },
  "480p": {
    "itag": "244",
    "xtags": "",
    "lmt": "1440215890236689",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=244&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "video/webm;+codecs=\"vp9\"",
    "bitrate": "396541",
    "index": "243-1933",
    "size": "854x480",
    "projection_type": "1",
    "fps": "30",
    "clen": "7928237",
    "init": "0-242",
    "quality_label": "480p"
  },
  "360p": {
    "itag": "243",
    "xtags": "",
    "lmt": "1440215888783441",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=243&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "video/webm;+codecs=\"vp9\"",
    "bitrate": "223695",
    "index": "243-1933",
    "size": "640x360",
    "projection_type": "1",
    "fps": "30",
    "clen": "5127362",
    "init": "0-242",
    "quality_label": "360p"
  },
  "240p": {
    "itag": "242",
    "xtags": "",
    "lmt": "1440215900971640",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=242&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "video/webm;+codecs=\"vp9\"",
    "bitrate": "113952",
    "index": "242-1931",
    "size": "426x240",
    "projection_type": "1",
    "fps": "30",
    "clen": "2597162",
    "init": "0-241",
    "quality_label": "240p"
  },
  "144p": {
    "itag": "278",
    "xtags": "",
    "lmt": "1440215900119192",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=278&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "video/webm;+codecs=\"vp9\"",
    "bitrate": "60303",
    "index": "242-1930",
    "size": "256x144",
    "projection_type": "1",
    "fps": "15",
    "clen": "1798744",
    "init": "0-241",
    "quality_label": "144p"
  },
  "audio/mp4;+codecs=\"mp4a.40.2\"": {
    "bitrate": "128266",
    "itag": "140",
    "xtags": "",
    "lmt": "1440578358539132",
    "index": "592-1271",
    "clen": "8482615",
    "projection_type": "1",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=140&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "audio/mp4;+codecs=\"mp4a.40.2\"",
    "init": "0-591"
  },
  "audio/webm;+codecs=\"vorbis\"": {
    "bitrate": "118499",
    "itag": "171",
    "xtags": "",
    "lmt": "1440215938192462",
    "index": "4452-5366",
    "clen": "6383456",
    "projection_type": "1",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=171&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "audio/webm;+codecs=\"vorbis\"",
    "init": "0-4451"
  },
  "audio/webm;+codecs=\"opus\"": {
    "bitrate": "154966",
    "itag": "251",
    "xtags": "",
    "lmt": "1440215889283443",
    "index": "272-1186",
    "clen": "9526605",
    "projection_type": "1",
    "url": "https://r16---sn-n4v7kn7r.c.youtube.com/videoplayback?itag=251&keepalive=ye…2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csc%2Csource%2Cexpire&mt=1498245944",
    "type": "audio/webm;+codecs=\"opus\"",
    "init": "0-271"
  }
}

Answer 2

截至今日15/06/2012非常简单; 但是你必须注意未来的变化.这是(在Javascript中)

try{
    var urls = document.body.innerHTML.match(/"url_encoded_fmt_stream_map": "url=([^"]+)/)[1]
    urls = decodeURIComponent(urls).replace(/\\u0026/g,'&')
    urls = urls.replace(/&quality.+?(?=,url)/g,'');;
    urls = urls.split(',url=')
    // urls is an array of all the possible qualities
    // To download one you could use something like:
    // document.location = urls[0]
    // The first one is usually in the highest quality available
} catch(e){
    console.error("Youtube may have changed its API")
}