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前言
現(xiàn)在知乎允許上傳視頻，奈何不能下載視頻，好氣哦，無(wú)奈之下研究一下了，然后擼了代碼，方便下載視頻保存。
接下來以 貓為什么一點(diǎn)也不怕蛇？ 回答為例，分享一下整個(gè)下載過程。
調(diào)試一下
打開 F12, 找到光標(biāo)，如下圖：
然后將光標(biāo)移動(dòng)到視頻上。如下圖：
咦這是什么？視野中出現(xiàn)了一條神秘的鏈接: https://www.zhihu.com/video/xxxxx，讓我們將這條鏈接復(fù)制到瀏覽器上，然后打開：
似乎這就是我們要找的視頻，不要著急，讓我們看一看，網(wǎng)頁(yè)的請(qǐng)求，然后你會(huì)發(fā)現(xiàn)一個(gè)很有意思的請(qǐng)求(重點(diǎn)來了):
讓我們自己看一下數(shù)據(jù)吧:
重慶分公司
重慶分公司
{
"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": {}
}沒錯(cuò)了，我們要下載的視頻就在這里面，其中 ld 代表普清,sd 代表標(biāo)清, hd 代表高清，把相應(yīng)鏈接再次在瀏覽器打開，然后右鍵保存就可以下載視頻了。
代碼
知道整個(gè)流程是什么樣子，接下來擼代碼的過程就簡(jiǎn)單了，這里就不過再做過多解釋了，直接上代碼:
# -*- 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(
"鏈接格式應(yīng)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("獲取視頻編號(hào)異常:{}".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("清晰度參數(shù)異常,僅支持:ld(普清),sd(標(biāo)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())上述就是小編為大家分享的如何使用python 抓取知乎指定回答下視頻了，如果剛好有類似的疑惑，不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí)，歡迎關(guān)注創(chuàng)新互聯(lián)-成都網(wǎng)站建設(shè)公司行業(yè)資訊頻道。
