属性错误：“str”对象没有属性“write”，youtube-dl kivy

问题描述 投票：0回答：4

我目前正在开发一个小项目，需要 youtube-dl 在 kivy 环境中工作。我有 python 3.8.3、Kivy 1.11.1、youtube-dl 2020.5.8。除了这个问题之外，kivy 在 python3.8 上工作得很好。

我在尝试使用 youtube-dl 获取有关 YouTube 视频的信息时遇到此错误 

AttributeError: 'str' object has no attribute 'write'

它确实适用于少数链接，但不适用于其他许多链接。

这个错误已经出现在 youtube-dl 的 github 页面 [[此处]][1] 上，但我找不到任何解决方案。

这是以下两个带有可重现示例的案例。

案例1

import youtube_dl from kivy.app import App from kivy.uix.button import Button class MusicApp(App): def build(self): return Button(text='Example') ydl_opts = { 'outtmpl': '%(title)s.%(ext)s', 'audio-format': 'bestaudio/best', 'postprocessors': [{ 'key': 'FFmpegExtractAudio', 'preferredcodec': 'mp3', 'preferredquality': '192', }], } with youtube_dl.YoutubeDL(ydl_opts) as ydl: ydl.download(['https://www.youtube.com/watch?v=BaW_jenozKc']) 
输出

[INFO   ] [Logger      ] Record log in /home/adarsh/.kivy/logs/kivy_20-06-23_1.txt
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "/usr/local/lib/python3.8/dist-packages/kivy/__init__.py"
[INFO   ] [Python      ] v3.8.2 (default, Apr 27 2020, 15:53:34) 
[GCC 9.3.0]
[INFO   ] [Python      ] Interpreter at "/usr/bin/python3"
[INFO   ] [Factory     ] 184 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2(['text_pango'] ignored)
[youtube] BaW_jenozKc: Downloading webpage
[download] Resuming download at byte 215799
[download] Destination: youtube-dl test video ''_ä↭𝕐.f137.mp4
[download] 100% of 2.11MiB in 00:07.90KiB/s ETA 00:00
[download] Destination: youtube-dl test video ''_ä↭𝕐.f140.m4a
[download] 100% of 154.06KiB in 00:00.07KiB/s ETA 00:00
[ffmpeg] Merging formats into "youtube-dl test video ''_ä↭𝕐.mp4"
Deleting original file youtube-dl test video ''_ä↭𝕐.f137.mp4 (pass -k to keep)
Deleting original file youtube-dl test video ''_ä↭𝕐.f140.m4a (pass -k to keep)
[ffmpeg] Destination: youtube-dl test video ''_ä↭𝕐.mp3
Deleting original file youtube-dl test video ''_ä↭𝕐.mp4 (pass -k to keep)

案例2

import youtube_dl
from kivy.app import App
from kivy.uix.button import Button


class MusicApp(App):
    def build(self):
        return Button(text='Example')


ydl_opts = {
    'outtmpl': '%(title)s.%(ext)s',
    'audio-format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192',
    }],
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(['https://www.youtube.com/watch?v=nTj4wVJAbNg'])

输出

[INFO   ] [Logger      ] Record log in /home/adarsh/.kivy/logs/kivy_20-06-23_2.txt
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "/usr/local/lib/python3.8/dist-packages/kivy/__init__.py"
[INFO   ] [Python      ] v3.8.2 (default, Apr 27 2020, 15:53:34) 
[GCC 9.3.0]
[INFO   ] [Python      ] Interpreter at "/usr/bin/python3"
[INFO   ] [Factory     ] 184 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2(['text_pango'] ignored)
[youtube] nTj4wVJAbNg: Downloading webpage
 Traceback (most recent call last):
   File "temp/tmp.py", line 21, in <module>
     ydl.download(['https://www.youtube.com/watch?v=nTj4wVJAbNg'])
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 2018, in download
     res = self.extract_info(
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 808, in extract_info
     return self.process_ie_result(ie_result, download, extra_info)
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 863, in process_ie_result
     return self.process_video_result(ie_result, download=download)
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 1644, in process_video_result
     self.process_info(new_info)
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 1902, in process_info
     self.report_warning(
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 613, in report_warning
     self.to_stderr(warning_message)
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 527, in to_stderr
     self._write_string(output, self._err_file)
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 506, in _write_string
     write_string(s, out=out, encoding=self.params.get('encoding'))
   File "/home/adarsh/.local/lib/python3.8/site-packages/youtube_dl/utils.py", line 3174, in write_string
     out.buffer.write(byt)
 AttributeError: 'str' object has no attribute 'write'

即使有一些解决方法，也请提出建议。


编辑：
我将一个记录器传递给了 youtube-dl，该记录器取自他们的 github 页面

class MyLogger(object):
    def debug(self, msg):
        print("DEBUG " + msg)
        pass

    def warning(self, msg):
        print("WARNING " + msg)
        pass

    def error(self, msg):
        print("ERROR " + msg)

稍后我需要编写自己的记录器来获取下载进度。所以我将采用这个解决方案。
[1]：
https://github.com/ytdl-org/youtube-dl/issues/22109
    



    
    python-3.x
    
    kivy
    
    youtube-dl
    
    
4个回答

    

      
      
      

        

          

            

              
2
投票

              
            

          

        

        
我正在做一个类似的项目并遇到了同样的错误。


我捕获了异常并打印了回溯


import traceback

... 

  try:
     with youtube_dl.YoutubeDL(self.ydl_opts) as ydl:
        ydl.download([self.url])
  except Exception as inst:
     print(inst)
     tb = traceback.format_exc()
     print(tb)
     pass

我得到了这个：


'str' object has no attribute 'write'
Traceback (most recent call last):
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/extractor/generic.py", line 2277, in _real_extract
    % (url, url), expected=True)
youtube_dl.utils.ExtractorError: 'qsd' is not a valid URL. Set --default-search "ytsearch" (or run  youtube-dl "ytsearch:qsd" ) to search YouTube

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "src/main.py", line 81, in run
    download_retcode = ydl.download([self.url])
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2019, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 820, in extract_info
    self.report_error(compat_str(e), e.format_traceback())
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 625, in report_error
    self.trouble(error_message, tb)
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 578, in trouble
    self.to_stderr(message)
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 527, in to_stderr
    self._write_string(output, self._err_file)
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 506, in _write_string
    write_string(s, out=out, encoding=self.params.get('encoding'))
  File "/home/odrevet/.local/lib/python3.6/site-packages/youtube_dl/utils.py", line 3180, in write_string
    out.buffer.write(byt)
AttributeError: 'str' object has no attribute 'write'


通过查看堆栈中的函数名称，我们可以看到当 ytdl 尝试报告另一个错误时发生错误（在本例中为：“youtube_dl.utils.ExtractorError：'qsd'不是有效的 URL”，因为我输入了我的程序中的“qsd”而不是有效的网址）。


通过查看 YoutubeDl.py 中的 to_stderr 函数，我们可以看到 out 应该是 sys.stderr，而在 utils.py 中出现错误的函数中：


def write_string(s, out=None, encoding=None):
    print(type(out))    # I added this line
    if out is None:
        out = sys.stderr
    assert type(s) == compat_str

    if sys.platform == 'win32' and encoding is None and hasattr(out, 'fileno'):
        if _windows_write_string(s, out):
            return

    if ('b' in getattr(out, 'mode', '')
            or sys.version_info[0] < 3):  # Python 2 lies about mode of sys.stderr
        byt = s.encode(encoding or preferredencoding(), 'ignore')
        out.write(byt)
    elif hasattr(out, 'buffer'):
        enc = encoding or getattr(out, 'encoding', None) or preferredencoding()
        byt = s.encode(enc, 'ignore')
        out.buffer.write(byt)    # Error on line 3180
    else:
        out.write(s)
  out.flush()

stderr 根据 hasattr elif 检查有一个 buffer 属性，问题是 Kivy 如何处理错误流。根据我在 write_string 中添加的打印，stderr 被重新定义为 
 ，它确实有一个缓冲区属性，就像它应该是的 Stream 一样，但这个属性是一个简单的字符串。 

参见
https://kivy.org/doc/stable/_modules/kivy/logger.html

class LogFile(object):

    def __init__(self, channel, func):
        self.buffer = ''     # <-- a str
        self.func = func
        self.channel = channel
        self.errors = ''

我不知道是否可以参数 kivy 以使用 stderr 标准流，但我会检查。同时捕获异常并打印回溯，至少在“处理上述异常期间，发生了另一个异常”之前有原始错误


编辑：您可以将 stderr 重定向到文件


sys.stderr = open('./stderr', 'w')

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
在 Android 上使用 youtube_dl 运行 kivy 应用程序来下载单个视频的音轨时，我遇到了同样的问题。下载相同的视频音频在 Windows 10 上运行正常。


我通过更改 youtube_dl 选项中的音频格式解决了该问题。这是代码摘录：


if os.name == 'posix':
    # on AndroidAndroid, FFmpegExtractAudio not available !
    self.ydlOutTmplFormat = '/%(title)s.mp3'

    self.ydl_opts = {
        #'format': 'bestaudio/best', # for unknown reason, not working on
                                     # Android when used by AudioDownloaderGUI !
        'format': 'worstaudio/worst',# This fixes the error "AttributeError:
                                     # 'str' object has no attribute 'write'"
        'quiet': YOUTUBE_DL_QUIET
    }
else:
    self.ydlOutTmplFormat = '\\%(title)s.%(ext)s'
    
    self.ydl_opts = {
        'format': 'bestaudio/best',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '128',
        }],
        'quiet': YOUTUBE_DL_QUIET
    }

我没有任何解释为什么这个修改可以解决问题。在不使用kivy的演示程序中使用Android上的youtube_dl时，不会出现该问题。这是我的演示代码：


import os, re
import youtube_dl

if os.name == 'posix':
    targetAudioDir = '/storage/emulated/0/Download/Audiobooks/test_youtube_dl'
    ydl_opts = {
        'outtmpl': targetAudioDir + '/%(title)s.mp3',
        'format': 'bestaudio/best',
        #'format': 'worstaudio/worst',
        'quiet': False
    }
else:
    targetAudioDir = 'D:\\Users\\Jean-Pierre\\Downloads\\Audiobooks\\test_youtube_dl'
    ydl_opts = {
        'outtmpl': targetAudioDir + '\\%(title)s.%(ext)s',
        #'format': 'bestaudio/best',
        'format': 'worstaudio/worst',
        'postprocessors': [{
                            'key': 'FFmpegExtractAudio',
                            'preferredcodec': 'mp3',
                            'preferredquality': '96',
                        }],
    'quiet': False
    }

singlevideoUrl = 'https://youtu.be/Eqy6M6qLWGw'

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    # downloading single video
    meta = ydl.extract_info(singlevideoUrl, download=False)
    videoTitle = meta['title']
    ydl.download([singlevideoUrl]) # not playable by kivy SoundLoader
    print('{} audio track downloaded'.format(videoTitle))

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
我遇到了同样的问题，我使用
os
库解决了它。




  • 首先，我使用 YouTube.dl 函数创建一个 
    convert.py
     脚本。
    

    

  • 其次，在 kivy 中，我没有调用 YouTube.dl，而是将链接保存在 
    .txt
     文件中，然后使用带有要转换和准备的链接的 txt 来调用 
    os.system
     (
    python3 convert.py
    )。

    

    
    
    • 




      

      
      
      

      

        

          

            

              
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