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HomeBackend DevelopmentPython TutorialExample of implementing Youku video batch download function using Python

前段时间由于收集视频数据的需要,自己捣鼓了一个YouKu视频批量下载的程序。东西虽然简单,但还挺实用的,拿出来分享给大家。

  版本:Python2.7+BeautifulSoup3.2.1

import urllib,urllib2,sys,os
from BeautifulSoup import BeautifulSoup
import itertools,re
url_i =1
pic_num = 1
#自己定义的引号格式转换函数
def _en_to_cn(str):
  obj = itertools.cycle(['“','”'])
  _obj = lambda x: obj.next()
  return re.sub(r"['\"]",_obj,str)
if name == 'main':
  #下载连续3个网页的视频
  while url_i <= 3:
    webContent = urllib2.urlopen("http://news.youku.com/focus/index/_page26716_" + str(url_i) + ".html")
    data = webContent.read()
    #利用BeautifulSoup读取视频列表网页数据
    soup = BeautifulSoup(data)
    print "-------------------------Page " + str(url_i) + "-------------------------"
    #获得相应页面的视频thumbnail和title的list
    tag_list_thumb = soup.findAll(&#39;li&#39;,&#39;v_thumb&#39;)
    tag_list = soup.findAll(&#39;li&#39;, "v_title")
    for item in tag_list:
      #通过每个thumbnail中的herf导向视频播放页面
      web_video_play = urllib2.urlopen(item.a[&#39;href&#39;])
      data_vp = web_video_play.read()
      #利用BeautifulSoup读取视频播放网页数据
      soup_vp = BeautifulSoup(data_vp)
      #找到“下载”对应的链接
      tag_vp_list = soup_vp.findAll(&#39;a&#39;, id = &#39;fn_download&#39;)
      for item_vp in tag_vp_list:
        #将下载链接保存到url_dw中
        url_dw = &#39;"&#39; + item_vp[&#39;_href&#39;] + &#39;"&#39;
        print item.a[&#39;title&#39;] + ": " + url_dw
        #调用命令行运行iku下载视频,需将iku加入环境变量
        os.system("iku " + url_dw)
    #保存每个视频的thumbnail
    for item_thumb in tag_list_thumb:
      urllib.urlretrieve(item_thumb.img[&#39;src&#39;], "E:\\下载视频\\thumbnails\\" + str(pic_num) + "." +
                _en_to_cn(item_thumb.img[&#39;title&#39;]) + ".jpg")
      pic_num += 1
    print "--------------------------------------------------------------"
    print "--------Page " + str(url_i) + "&#39;s video thumbnails have been saved!"
    url_i += 1

  程序思想很简单,就是通过解析网页数据找到相应的视频播放网页链接,然后根据播放页面找到下载的链接,如下图所示:

Example of implementing Youku video batch download function using Python

  由于从网页数据中获得的下载链接是必须通过youku自己的iku才能下载的。这一点费了我一番周折,侥幸发现iku这个软件的命令行非常简单(直接iku download_link即可),所以最简单的办法就是利用Python中的命令行接口os.system来调用iku来下载视频。另外注意程序运行之前需要先启动iku,否则下载完一个视频就要再启动一次。

PS:下载视频的时候就会发现,国内这些视频网页做的真的不够精细,含有太多的重复链接和坏死链接,小小鄙视一下。


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