youtube-dl 如何在 bilibili 上获取视频的真实 url？

Question

打开https://github.com/ytdl-org/youtube-dl/tree/master/youtube_dl/extractor,bilibili.py，我得到bilibili.py源代码，它没有任何帮助。
对于像我这样的新手来说，一遍又一遍地看bilibili.py's source code是没有用的。
我很难理解 youtube-dl 如何在 bilibili 上获取视频的真实 url？
bilibili.py在bilibili上提取视频真实url的原理是什么？
bilibili.py's source code中有421行，请将bilibili.py简化为getUrlFromBilibili等短单函数。

url = "https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593"
real_url = getUrlFromBilibili(url)
print(real_url)

请完成getUrlFromBilibili函数，并在其中给出一些cmets来说明获取视频在bilibili上的真实url的原理。

def  getUrlFromBilibili(url):
    #make the function short as soon as possible

Answer 1

看起来您只想获取不带参数的 url 部分。这可以像这样简单地实现。

url = "https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593"
real_url = url.split('?')[0]

//real_url = https://www.bilibili.com/video/av52135588

Answer 2

你说过你需要为此使用函数并且需要知道原则。 Bilibili 网站就像一个 youtube。里面有很多视频。您必须进行编程才能从您输入的任何视频网址中获取真实网址。我将展示如何做到这一点。

def  getUrlFromBilibili(url):
    real_url = url[:url.find('?')]
    return real_url;

URL = input("Copy and Paste your Bilibili url = ")
#https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593
print("Real url is = ", getUrlFromBilibili(URL))

输出-：

Copy and Paste your Bilibili url = https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593

Real url is = https://www.bilibili.com/video/av52135588

现在我要解释这段代码

#Start of the function

def  getUrlFromBilibili(url):      #This the function which we use to store our url
    real_url = url[:url.find('?')] #In here we remove all characters after '?' in your url including '?'
    return real_url;               #After that we return our shorten url 

#End of the function


URL = input("Copy and Paste your Bilibili url")  #In here You can Enter any video url from Bilibili.com

print("Real url is = ", getUrlFromBilibili(URL))         #After all actions shorten url is displaying in here.

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重要

如果您只想从此网址获取真实网址 -> https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593 您可以使用此代码

def  getUrlFromBilibili(url):
    real_url = url[:url.find('?')]
    return real_url;

print("Real url is = ", getUrlFromBilibili("https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593"))

输出-：

Copy and Paste your Bilibili url = https://www.bilibili.com/video/av52135588?from=search&seid=5625791913889140593

Real url is = https://www.bilibili.com/video/av52135588