（Python基础教程之二十二）爬虫下载网页视频(video blob)

现在视频链接一般为m3u8,找到m3u8地址就可以下载了

1. 打开Chrome Developer工具，然后点击“网络”标签。
2. 导航到包含视频的页面，然后开始播放。
3. 将文件列表过滤为“ m3u8”。
4. 找到master.m3u8或index.m3u8并单击它。
5. 将文件保存到磁盘并在其中查看。
6. 如果文件包含一个m3u8主URL，则复制该URL。
7. 使用ffmpeg 工具下载m3u8视频

ffmpeg -i "https://secure.brightcove.com/services/mobile/streaming/index/rendition.m3u8?assetId=6138283938001&secure=true&videoId=6138277786001" -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 6138277786001.mp4

Python下载代码

#!/usr/bin/env python3importrequests,urllibfrombs4importBeautifulSoupimportosimportsubprocess pwd=os.path.split(os.path.realpath(__file__))[0]url="https://www.topgear.com/videos"headers={'upgrade-insecure-requests':"1",'user-agent':"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",'accept':"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",'accept-encoding':"gzip, deflate, br",'accept-language':"zh-CN,zh;q=0.9,en;q=0.8",'cookie':"has_js=1; minVersion={\"experiment\":1570672462,\"minFlavor\":\"new_vermi-1.13.7.11.js100\"}; minUniq=%7B%22minUID%22%3A%22bb80328a30-e8cdeb4d55-9a314411d2-aff4bb11a6-4aa23e3779%22%7D; minDaily=%7B%22testMode%22%3Atrue%2C%22dailyUser%22%3Atrue%7D; __gads=ID=b6eee23a8df86f72:T=1588041695:S=ALNI_MYCQR1Bf2fq53bqISIZBy8kIgI9oA; minBuffer=%7B%22minAnalytics%22%3A%22%7B%5C%22clicks%5C%22%3A%5B%5D%2C%5C%22clicksDelay%5C%22%3A%5B%5D%7D%22%2C%22_minEE1%22%3A%22%5B%5D%22%7D; minSession=%7B%22minSID%22%3A%227f32fd50ab-88cc4cf6f3-68d284cdee-1faeb65c08-c5966d76ac%22%2C%22minSessionSent%22%3Atrue%2C%22hadImp%22%3Atrue%2C%22sessionUniqs%22%3A%22%7Btime%3A1588053248571%2Clist%3A%5B11206251nt0%5D%7D%22%7D; OptanonConsent=landingPath=NotLandingPage&datestamp=Tue+Apr+28+2020+13%3A55%3A33+GMT%2B0800+(%E4%B8%AD%E5%9B%BD%E6%A0%87%E5%87%86%E6%97%B6%E9%97%B4)&version=3.6.24&AwaitingReconsent=false&groups=1%3A1%2C101%3A0%2C2%3A0%2C0_132429%3A0%2C3%3A0%2C4%3A0%2C0_132431%3A0%2C104%3A0%2C106%3A0%2C111%3A0%2C114%3A0%2C120%3A0%2C124%3A0%2C126%3A0%2C130%3A0%2C133%3A0%2C134%3A0%2C144%3A0%2C145%3A0%2C146%3A0%2C147%3A0%2C150%3A0%2C151%3A0%2C157%3A0%2C162%3A0%2C173%3A0%2C0_126679%3A0%2C0_137695%3A0%2C0_132361%3A0%2C0_132391%3A0; GED_PLAYLIST_ACTIVITY=W3sidSI6Ijh5clQiLCJ0c2wiOjE1ODgwNTMzNDksIm52IjowLCJ1cHQiOjE1ODgwNTMzMzMsImx0IjoxNTg4MDUzMzM3fV0.",'cache-control':"no-cache"}if__name__=='__main__':response=requests.request("GET",url,headers=headers)soup=BeautifulSoup(response.text,'html.parser')videoId=soup.find_all('video',class_="video-js")[0]['data-video-id']##获取视频Idtitle=soup.find_all('h1',class_="video-player__title")[0].contents[0]##获取视频标题url="https://secure.brightcove.com/services/mobile/streaming/index/master.m3u8?videoId={}&secure=true".format(videoId)##生成视频下载Urlfilename='{}.mp4'.format(title).replace(" ","-")cmd_str='ffmpeg -i \"'+url+'\" '+'-acodec copy -vcodec copy -absf aac_adtstoasc '+pwd+"/"+filename##下载视频print(cmd_str)subprocess.call(cmd_str,shell=True)

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