Mac上ffprobe/avprobe和youtube_dl的Python问题

Question

我昨天开始自学Python，所以在此之前对任何礼仪错误表示歉意。我的挑战是获取一个歌曲标题的。csv列表，在YouTube上搜索每个视频，然后使用youtube-dl下载音频。我的代码似乎适用于一个输出文件，但由于我无法解决的原因，循环结束了。主要错误是downloaderror:[0；31merror:[0m ffprobe或avprobe未找到。请安装一个。但是我已经安装了这些（据我所知）。我试了一遍又一遍地试图解决这个问题，但没有任何基本知识，我快淹死了。我正在使用python 2.7.13。有什么建议吗？抱歉代码太丑了！

主要功能：

import csv
import youtube_extract

#concatenate column elements of each row:
with open('Songs for wedding test.csv') as f:
    reader = csv.reader(f)
    with open('Songs for wedding test output.csv', 'w') as g:
        writer = csv.writer(g)
        for row in reader:
            new_row = [' '.join([row[0], row[1]])] + row[2:]
            writer.writerow(new_row)

with open('Songs for wedding test output.csv', 'rb') as csvfile:
    spamreader = csv.reader(csvfile, delimiter=';')
    #Make into a list:
    data = list(spamreader)
    #Convert into usable strings:
    data2=data
    for i, item in enumerate(data): 
        data2[i] = str(data[i])
        youtube_extract.extract_download(data2[i])    
    print data2

它使用的函数youtube_extract.py:

#!/usr/bin/env python2.7

from __future__ import unicode_literals
import sys; sys.path
sys.path.append('/usr/local/bin/youtube-dl')
sys.path.append('/usr/local/Cellar/ffmpeg/3.2.4')
import os
import youtube_dl
import urllib
import urllib2
import bs4
from bs4 import BeautifulSoup


def extract_download(textToSearch):
    #Get rid of square brackets and quotes:
    query = urllib.quote(str(textToSearch).replace('[','').replace(']','').replace('"','').replace('"',''))
    url = "https://www.youtube.com/results?search_query=" + query
    response = urllib2.urlopen(url)
    html = response.read()
    soup = BeautifulSoup(html)
    for a in soup.findAll(attrs={'class':'yt-uix-tile-link'}, limit=1):
        vidid = 'https://www.youtube.com' + a['href']
        print vidid

    os.chdir('/Users/smurfo/Music/Wedding songs')
    ydl_opts = {
        'format': 'bestaudio/best',
        'download_archive': 'downloaded_songs.txt',
        'verbose': True,
        'outtmpl': 'Wedding songs/%(title)s.%(ext)s',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
    }
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([vidid])

    os.chdir('/Users/smurfo/Dropbox/Coding/Python learning')

================================== RESTART: /Users/smurfo/Dropbox/Coding/Python learning/csv reading.py ==================================

Warning (from warnings module):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/beautifulsoup4-4.5.3-py2.7.egg/bs4/__init__.py", line 181
UserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("html.parser"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.

The code that caused this warning is on line 1 of the file <string>. To get rid of this warning, change code that looks like this:

 BeautifulSoup([your markup])

to this:

 BeautifulSoup([your markup], "html.parser")

https://www.youtube.com/watch?v=7fkOqXAHLKQ
[debug] Encodings: locale US-ASCII, fs utf-8, out us-ascii, pref US-ASCII
[debug] youtube-dl version 2017.03.24
[debug] Python version 2.7.13 - Darwin-16.4.0-x86_64-i386-64bit
[debug] exe versions: none
[debug] Proxy map: {}
[youtube] 7fkOqXAHLKQ: Downloading webpage
[youtube] 7fkOqXAHLKQ: Downloading video info webpage
[youtube] 7fkOqXAHLKQ: Extracting video information
[youtube] {22} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {43} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {18} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {36} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {17} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {136} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {247} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {135} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {244} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {134} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {243} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {133} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {242} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {160} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {278} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {140} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {171} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {249} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {250} signature length 43.40, html5 player en_US-vflEzRdnB
[youtube] {251} signature length 43.40, html5 player en_US-vflEzRdnB
[debug] Invoking downloader on u'https://r5---sn-fpoq-hm2z.googlevideo.com/videoplayback?dur=202.950&lmt=1449647638777560&ip=151.18.103.48&key=yt6&id=o-AO0F6ZMx0LP0Swm_iDiWZtFd0HZozItNeM1bUmT7Q2Ey&itag=171&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&upn=jTIcpTuU5gc&mime=audio%2Fwebm&pcm2cms=yes&pl=17&source=youtube&gir=yes&ipbits=0&initcwndbps=838750&keepalive=yes&clen=3160765&mn=sn-fpoq-hm2z&mm=31&requiressl=yes&expire=1490574223&ms=au&ei=LwfYWNH4E4bLWcuTpcgK&mv=m&mt=1490552546&signature=10CC47D7073DC66C89435916227A67196D22DA2D.D55F1282DFF0CC8992D3680B6220F5FC5078BD72&ratebypass=yes'
[download] Destination: Wedding songs/Parov Stelar - Jimmys Gang (Official Video).webm

[K[download]   0.0% of 3.01MiB at 10.26KiB/s ETA 05:00
[K[download]   0.1% of 3.01MiB at 20.50KiB/s ETA 02:30
[K[download]   0.2% of 3.01MiB at 36.44KiB/s ETA 01:24
[K[download]   0.5% of 3.01MiB at 65.40KiB/s ETA 00:46
[K[download]   1.0% of 3.01MiB at 111.40KiB/s ETA 00:27
[K[download]   2.0% of 3.01MiB at 192.12KiB/s ETA 00:15
[K[download]   4.1% of 3.01MiB at 334.31KiB/s ETA 00:08
[K[download]   8.3% of 3.01MiB at 543.36KiB/s ETA 00:05
[K[download]  16.6% of 3.01MiB at 748.14KiB/s ETA 00:03
[K[download]  33.1% of 3.01MiB at 940.02KiB/s ETA 00:02
[K[download]  66.3% of 3.01MiB at  1.22MiB/s ETA 00:00
[K[download] 100.0% of 3.01MiB at  1.43MiB/s ETA 00:00
[K[download] 100% of 3.01MiB in 00:02
[0;31mERROR:[0m ffprobe or avprobe not found. Please install one.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1930, in post_process
    files_to_delete, info = pp.run(info)
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 239, in run
    filecodec = self.get_audio_codec(path)
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 154, in get_audio_codec
    raise PostProcessingError('ffprobe or avprobe not found. Please install one.')
PostProcessingError: ffprobe or avprobe not found. Please install one.


Traceback (most recent call last):
  File "/Users/smurfo/Dropbox/Coding/Python learning/csv reading.py", line 26, in <module>
    youtube_extract.extract_download(data2[i])
  File "/Users/smurfo/Dropbox/Coding/Python learning/youtube_extract.py", line 39, in extract_download
    ydl.download([vidid])
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1884, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 772, in extract_info
    return self.process_ie_result(ie_result, download, extra_info)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 826, in process_ie_result
    return self.process_video_result(ie_result, download=download)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1527, in process_video_result
    self.process_info(new_info)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1865, in process_info
    self.post_process(filename, info_dict)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1932, in post_process
    self.report_error(e.msg)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 589, in report_error
    self.trouble(error_message, tb)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 559, in trouble
    raise DownloadError(message, exc_info)
DownloadError: [0;31mERROR:[0m ffprobe or avprobe not found. Please install one.
>>> 

Answer 1

你想要音频作为MP3。YouTube只提供其他格式的音频，如M4A。因此，youtube-dl下载m4a文件并将其转换为MP3。youtube-dl不包括自定义mp3转换器。它使用ffmpeg或avconv进行音频转换。

因此，如果要转换音频，需要安装ffmpeg或AVCONV。我们的姊妹网站超级用户详细记录了在macOS上如何做到这一点。

你得到的其他警告是因为一个错误的美丽的汤。与其尝试自己解析搜索结果，不如让youtube-dl来做，一个类似'ytsearch1:flying bunny'的URL就可以完成这个任务。