python - 为什么我的 YouTube 视频下载器只下载一些视频，而对于其他视频，它会显示 URL 和密码等密钥错误？

Question

我正在尝试使用 Python pytube3 制作 YouTube 视频下载器，但它不会下载所有视频。有些视频很容易下载，但有些视频不会下载，而是显示错误：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\tarun\PycharmProjects\YTDownloader\venv\lib\site-packages\pytube\extract.py", line 297, in apply_descrambler
    for format_item in formats
  File "C:\Users\tarun\PycharmProjects\YTDownloader\venv\lib\site-packages\pytube\extract.py", line 297, in <listcomp>
    for format_item in formats
KeyError: 'url'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\tarun\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:/Users/tarun/PycharmProjects/YTDownloader/YTD.py", line 15, in video_download
    my_video = YouTube(input_user)
  File "C:\Users\tarun\PycharmProjects\YTDownloader\venv\lib\site-packages\pytube\__main__.py", line 92, in __init__
    self.descramble()
  File "C:\Users\tarun\PycharmProjects\YTDownloader\venv\lib\site-packages\pytube\__main__.py", line 132, in descramble
    apply_descrambler(self.player_config_args, fmt)
  File "C:\Users\tarun\PycharmProjects\YTDownloader\venv\lib\site-packages\pytube\extract.py", line 301, in apply_descrambler
    parse_qs(formats[i]["cipher"]) for i, data in enumerate(formats)
  File "C:\Users\tarun\PycharmProjects\YTDownloader\venv\lib\site-packages\pytube\extract.py", line 301, in <listcomp>
    parse_qs(formats[i]["cipher"]) for i, data in enumerate(formats)
KeyError: 'cipher'

标签： pythonpytube

Answer 1

这是pytube文件 extract.py 中的错误。

1. 转到安装包的位置。如果你不知道在哪里，运行命令

   pip show pytube3
   

   它会给你这样的东西：

我们可以看到Location: c:\users\tiago\anaconda3\lib\site-packages。

2. 转到该位置，打开文件夹 pytube 和文件 extract.py

3. 在文件中，行号。306 或 301，你会发现parse_qs(formats[i]["cipher"]). 如果是，则更"cipher"改为"signatureCipher"（确保“C”是大写字母）。

   所以，你最初会有

    cipher_url = [
                    parse_qs(formats[i]["cipher"]) for i, data in enumerate(formats)
                ]
   

   但应该是

    cipher_url = [
                    parse_qs(formats[i]["signatureCipher"]) for i, data in enumerate(formats)
                ]
   

4. 运行以下脚本以查看它是否正常工作

    # -*- coding: utf-8 -*-
    """
    Created on Mon Jun 15 12:21:49 2020
   
    @author: tiago
    """
    from pytube import YouTube
   
    video_url = "https://youtu.be/gp5tziO5lXg" # YouTube video URL
    youtube = YouTube(video_url)
    video = youtube.streams.first()
    video.download("C:/Users/tiago/Desktop/videos/") # Path where to store the video
   

然后，您将在该文件夹中看到下载的视频