网页视频抓取工具 知乎( 接下来以猫为什么一点也不怕蛇？回答为例，分享一下整个下载过程)
优采云 发布时间: 2022-02-16 23:08网页视频抓取工具 知乎(
接下来以猫为什么一点也不怕蛇？回答为例，分享一下整个下载过程)
Python抓取知乎的方法指定视频的答案
更新时间：2020-07-09 11:17:05 作者：李涛
本文章主要介绍python抓取知乎指定答案视频的方法。文中的讲解很详细，代码帮助大家更好的理解和学习。有兴趣的朋友可以了解一下。
前言
现在 知乎 允许上传视频，但我不能下载视频。气死我了，只好研究一下，然后写了代码方便下载和保存视频。
其次，为什么猫根本不怕蛇？以回答为例，分享整个下载过程。
调试它
打开F12，找到光标，如下图：
然后将光标移到视频上。如下所示：
咦这是什么？视野中出现了一个神秘的链接：，我们把这个链接复制到浏览器打开：
看来这就是我们要找的视频了，别着急，我们来看看，网页的请求，然后你会发现一个很有意思的请求（这里强调一下）：
让我们自己看一下数据：
{
"playlist": {
"ld": {
"width": 360,
"format": "mp4",
"play_url": "https://vdn.vzuu.com/LD/05fc411e-d8e0-11e8-bb8b-0242ac112a0b.mp4?auth_key=1541477643-0-0-987c2c504d14ab1165ce2ed47759d927&expiration=1541477643&disable_local_cache=1",
"duration": 17,
"size": 1123111,
"bitrate": 509,
"height": 640
},
"hd": {
"width": 720,
"format": "mp4",
"play_url": "https://vdn.vzuu.com/HD/05fc411e-d8e0-11e8-bb8b-0242ac112a0b.mp4?auth_key=1541477643-0-0-8b8024a22a62f097ca31b8b06b7233a1&expiration=1541477643&disable_local_cache=1",
"duration": 17,
"size": 4354364,
"bitrate": 1974,
"height": 1280
},
"sd": {
"width": 480,
"format": "mp4",
"play_url": "https://vdn.vzuu.com/SD/05fc411e-d8e0-11e8-bb8b-0242ac112a0b.mp4?auth_key=1541477643-0-0-5948c2562d817218c9a9fc41abad1df8&expiration=1541477643&disable_local_cache=1",
"duration": 17,
"size": 1920976,
"bitrate": 871,
"height": 848
}
},
"title": "",
"duration": 17,
"cover_info": {
"width": 720,
"thumbnail": "https://pic2.zhimg.com/80/v2-97b9435a0c32d01c7c931bd00120327d_b.jpg",
"height": 1280
},
"type": "video",
"id": "1039146361396174848",
"misc_info": {}
}
没错，我们要下载的视频就在这里，其中ld代表普通清晰度，sd代表标清，hd代表高清。再次在浏览器中打开对应的链接，然后右键保存视频即可下载。
代码
知道了整个过程是什么样子，接下来的编码过程就很简单了。我这里就解释太多了，直接上代码：
# -*- encoding: utf-8 -*-
import re
import requests
import uuid
import datetime
class DownloadVideo:
__slots__ = [
'url', 'video_name', 'url_format', 'download_url', 'video_number',
'video_api', 'clarity_list', 'clarity'
]
def __init__(self, url, clarity='ld', video_name=None):
self.url = url
self.video_name = video_name
self.url_format = "https://www.zhihu.com/question/\d+/answer/\d+"
self.clarity = clarity
self.clarity_list = ['ld', 'sd', 'hd']
self.video_api = 'https://lens.zhihu.com/api/videos'
def check_url_format(self):
pattern = re.compile(self.url_format)
matches = re.match(pattern, self.url)
if matches is None:
raise ValueError(
"链接格式应符合:https://www.zhihu.com/question/{number}/answer/{number}"
)
return True
def get_video_number(self):
try:
headers = {
'User-Agent':
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36'
}
response = requests.get(self.url, headers=headers)
response.encoding = 'utf-8'
html = response.text
video_ids = re.findall(r'data-lens-id="(\d+)"', html)
if video_ids:
video_id_list = list(set([video_id for video_id in video_ids]))
self.video_number = video_id_list[0]
return self
raise ValueError("获取视频编号异常:{}".format(self.url))
except Exception as e:
raise Exception(e)
def get_video_url_by_number(self):
url = "{}/{}".format(self.video_api, self.video_number)
headers = {}
headers['Referer'] = 'https://v.vzuu.com/video/{}'.format(
self.video_number)
headers['Origin'] = 'https://v.vzuu.com'
headers[
'User-Agent'] = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36'
headers['Content-Type'] = 'application/json'
try:
response = requests.get(url, headers=headers)
response_dict = response.json()
if self.clarity in response_dict['playlist']:
self.download_url = response_dict['playlist'][
self.clarity]['play_url']
else:
for clarity in self.clarity_list:
if clarity in response_dict['playlist']:
self.download_url = response_dict['playlist'][
self.clarity]['play_url']
break
return self
except Exception as e:
raise Exception(e)
def get_video_by_video_url(self):
response = requests.get(self.download_url)
datetime_str = datetime.datetime.now().strftime("%Y-%m-%d %H-%M-%S")
if self.video_name is not None:
video_name = "{}-{}.mp4".format(self.video_name, datetime_str)
else:
video_name = "{}-{}.mp4".format(str(uuid.uuid1()), datetime_str)
path = "{}".format(video_name)
with open(path, 'wb') as f:
f.write(response.content)
def download_video(self):
if self.clarity not in self.clarity_list:
raise ValueError("清晰度参数异常,仅支持:ld(普清),sd(标清),hd(高清)")
if self.check_url_format():
return self.get_video_number().get_video_url_by_number().get_video_by_video_url()
if __name__ == '__main__':
a = DownloadVideo('https://www.zhihu.com/question/53031925/answer/524158069')
print(a.download_video())
结语
代码仍有优化空间。在这里，我刚刚下载了答案中的第一个视频。理论上，一个答案下应该有多个视频。如果您有任何问题或建议，请随时交流。
以上就是python抓取知乎指定答案视频的方法的详细内容。更多关于python抓视频的内容，请关注脚本之家文章的其他相关话题！
