我imageio.plugins.ffmpeg.download()在安装moviepy和imageio并导入imageio没有错误后尝试运行该命令。我不断收到以下错误，无法找出解决方案：
Imageio: 'ffmpeg-osx-v3.2.4' was not found on your computer; downloading it now.
Error while fetching file: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726)>.
Error while fetching file: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726)>.
Error while fetching file: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED]` certificate verify failed (_ssl.c:726)>.
Error while fetching file: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED]` certificate verify failed (_ssl.c:726)>.
---------------------------------------------------------------------------
IOError Traceback (most recent call last)
<ipython-input-1-8b0dfa2efbcc> in <module>()
3 get_ipython().magic(u'matplotlib inline')
4 import imageio
----> 5 imageio.plugins.ffmpeg.download()
6 import matplotlib
7 import matplotlib.pyplot as plt
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/imageio/plugins/ffmpeg.pyc in download(directory, force_download)
71 get_remote_file(fname=fname,
72 directory=directory,
---> 73 force_download=force_download)
74
75
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/imageio/core/fetching.pyc in get_remote_file(fname, directory, force_download, auto)
125 return filename
126 else: # pragma: no cover
--> 127 _fetch_file(url, filename)
128 return filename
129
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/imageio/core/fetching.pyc in _fetch_file(url, file_name, print_destination)
181 raise IOError('Unable to download %r. Perhaps there is a no internet '
182 'connection? If there is, please report this problem.' %
--> 183 os.path.basename(file_name))
184
185
IOError：无法下载“ffmpeg-osx-v3.2.4”。也许没有互联网连接？如果有，请报告此问题。
我尝试了所有我能想到或/并在网上找到的解决方案，包括此处描述的ffmpeg installation on macOS for MoviePy failed with SSL error，但没有任何帮助。有没有人找到另一种解决方案？
谢谢