通过爬虫抓取秒懂百科视频

最近想做一个小项目，需要一些百科知识。我便把目标瞄准了百度百科上。
爬取百科文本，相对容易，爬取秒懂百科的视频文件，就有些麻烦了。以前也爬过阳光视频的视频文件，阳光视频在网页源码中能找到一个加密的视频网址。但是秒懂百科找了半天没找到。
思路一：从html 的video标签入手。
检查元素，我们可以看到如下

网页显示的视频地址带有一个blob:的前缀。你直接访问是没有用的。
（关于vedio 标签的 提供的 blob格式隐藏视频实际地址，网上有许多介绍，这里就不提了。）总之这个地址就是个糊弄人的。联想到 blob 一般利用XMLHttpRequets请求数据。我在js代码中用关键词搜索了一圈，结果啥也没发现。emmm。。。

思路二：
我发现秒懂百科的视频在点击时才会加载。那么我只要进行网络的监控，抓包分析一下不就能抓到正确的数据来源了么。话是这么说，但是我个人比较菜。用wireshark抓了半天，还是没抓出什么东西。后来在网上逛了一圈，看见一篇下载youtube的博客。让我恍然大悟。video blob 实现不是用ajax实现的么，我只要监控ajax文件不就完事了么。
用chrome 开发者工具监控ajax文件。

一开始未播放视频前。清空ajax文件

点击播放按钮

下方窜出了一串xhr的文件，试着访问其中一个文件如
https://baikevideo.cdn.bcebos.com/media/mda-XXXhzKHv5Z824nu1/8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.0.ts
发现下载了一段ts格式的视频（关于ts，m3u8的视频格式，可以自行上网了解，只要知道这是一种视频格式就好了），打开视频，正是一段百科视频。到这基本就成了。接下来，只要观察就好了。

圈出来的地方是我需要的。秒懂百科将一段视频分成了5部分，我需要将这5部分全部爬下来，再拼接起来。首先观察在视频前面的几个ajax请求。

我们接下来需要解决几个问题
问题1：怎么找到全部的视频段（我们怎么知道有5段视频？）
我们发现在 ”8fdaab6c9fefa48819c3f5bf659e5eca_1280x720_1419000.m3u8“这个请求的返回值中存在全部视频段的信息。也就是通过这个请求可以知道全部的视频段信息。（其实我一开始以为百度会类似 part=5这样写明有5段视频的，但是似乎没有，只能通过返回值自己切分判断）

问题2：怎么获取这个“8fdaab6c9fefa48819c3f5bf659e5eca_1280x720_1419000.m3u8”文件

观察请求地址，https://baikevideo.cdn.bcebos.com/media/mda-XXXhzKHv5Z824nu1/8fdaab6c9fefa48819c3f5bf659e5eca_1280x720_1419000.m3u8

和其他视频请求地址比较（这里省略了）变动项主要是
“mda-XXXhzKHv5Z824nu1”-------记为part1 以及
“8fdaab6c9fefa48819c3f5bf659e5eca_1280x720_1419000.m3u8”---------记为part2

再继续分析前几个未分析的ajax请求

我们可以发现在第一个请求中，包含了我们需要的请求地址（hlsUrl）。那么我们只要找到第一个请求就可以找到我们需要的请求，再找到五段视频段（有点长。。。）
如果要知道第一个请求，我们还需要解析第一个请求的，请求地址结构。。。。有点累。

照着上面的思路一层层倒推，观察第一个请求的地址

可见的变动项只有三个
secondId=79203
t=1554209689208
_=1554209627051
似乎都没啥头绪，这要咋获得？以我爬虫的经验看，有时候参数不一定都是必须的。
实际上要成功访问第一个请求，只需要第一个参数即可，即只需要访问
https://baike.baidu.com/api/wikisecond/playurl?secondId=79203 即可获得返回值，三个变量只剩下一个变量了。这个变量一定在网页源码中。

我多次关闭打开页面，发现这个secondId一直是这个数字，这说明这个数字大概率不是js生成的随机数，而是写在源码中的固定值。
直接在源码中ctrl+F 输入79203.

找到了。。。。

最后我们只需要将这些信息拼接一下就好了
理一下思路

1.定位到网页中含有79203的标签，获取这个数字
2.生成请求1https://baike.baidu.com/api/wikisecond/playurl?secondId=79203
3.根据请求1的返回值获得请求2https://baikevideo.cdn.bcebos.com/media/mda-XXXhzKHv5Z824nu1/8fdaab6c9fefa48819c3f5bf659e5eca.m3u8
4.根据请求2获得全部的视频片段信息和网址
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXTINF:10.000000,
8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.0.ts
#EXTINF:10.000000,
8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.1.ts
#EXTINF:10.000000,
8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.2.ts
#EXTINF:10.000000,
8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.3.ts
#EXTINF:10.000000,
8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.4.ts
#EXTINF:8.000000,
8fdaab6c9fefa48819c3f5bf659e5eca.m3u8.0.5.ts
#EXT-X-ENDLIST
5.根据以上视频段地址，下载视频。

爬虫结束。。。。。。。。

上面这个爬虫需要访问4步以上才能获得视频，但在翻源码的时候，我偶然找到了那段我一直找不到的js代码。。。

上代码

!function(){    var safeCall = require('wiki-common:widget/util/safeCall');
    var s = require('wiki-lemma:widget/lemma_content/configModule/secondsKnowLarge/secondsKnowLarge');
    var c = require('wiki-lemma:widget/lemma_content/configModule/secondsKnowLarge/container');
    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function (data) {
        safeCall(s.initialize, data, s);
    });
}();

可以看见，c.initialize()里面包含的就是该词条的全部视频网址的信息。包括我需要的secondId=79203的视频文件。

所以还有一种方法是利用正则，将secondId筛选出，同时还有mid也筛选出来（这样可以比上面的方法省一步）

最后贴上我的代码

import requests,re
from pyquery import PyQuery as pq

headers = {
     'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.81 Safari/537.36'
}
#搜索词条
search = "大韩民国"
r = requests.get("https://baike.baidu.com/item/"+search,headers=headers)
html = r.text
#转码
html = html.encode(r.encoding)
html = html.decode("utf-8")
doc = pq(html)
#筛选出secondId,mid
seconds = re.findall(r"c.initialize\({\"secondsKnow\":\[{\"videoSrc\":{.*?\"secondId\":(\d+),\"mid\":\"(.+?)\"",html)
secondId,vedioUrl = seconds[0]
#获取视频段信息
url = "https://baike.baidu.com/api/wikisecond/playurl?secondId="+str(secondId)
r = requests.get(url,headers=headers)
#这一步是选取1280x720分辨率的视频，不过似乎所有分辨率返回的信息是一样的？
hlsUrl = r.json().get("list").get("hlsUrl")
r = requests.get(hlsUrl,headers=headers)
hlsUrl = "https://baikevideo.cdn.bcebos.com/media/"+vedioUrl+"/"+re.findall(r"\n([^#\n].*?)\n\n",r.text)[0]
r =requests.get(hlsUrl,headers=headers)
urls = re.findall(r"\n([^#].*?)\n",r.text)
url_part = "https://baikevideo.cdn.bcebos.com/media/"+vedioUrl+"/"
#爬取ts格式的视频段，写入一个视频文件中
file = open("E:/py/Baidu/miaodong/"+search+".mp4","ab+")
for url in urls:
    r = requests.get(url_part+url,headers=headers)
    file.write(r.content)
file.close()

初步写的，有点丑，后面再用scrapy爬。

ps：关于ts文件合并，网上大多是用copy /b的系统命令实现的。我琢磨这个copy /b可以把txt合并，把txt和jpg合并，把视频合并…这么高的适应性让我深深的怀疑，这个函数实际只是将两个文件简单拼接罢了。所以我直接把5个文件以二进制流写入1个ts文件。事实证明，完全可行。。。。后来尝试了将写入文件后缀直接设置为mp4,也完全可以播放（似乎js转MP4不需要任何转码23333）

贴上最后的成果