import moviepy 报错

i was trying to create an application with python using the moviepy library. I installed it using:

pip install moviepy

I found this from a MoviePy crash-course:

Import everything needed to edit video clips

from moviepy.editor import *

After trying to run this line i get this error:

Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:42:59) [MSC v.1500 32     bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> # Import everything needed to edit video clips
... from moviepy.editor import *
Traceback (most recent call last):
  File "", line 2, in 
  File "C:\Python27\lib\site-packages\moviepy\editor.py", line 22, in 
    from .video.io.VideoFileClip import VideoFileClip
  File "C:\Python27\lib\site-packages\moviepy\video\io\VideoFileClip.py", line 3, in 
    from moviepy.video.VideoClip import VideoClip
  File "C:\Python27\lib\site-packages\moviepy\video\VideoClip.py", line 20, in 
    from .io.ffmpeg_writer import ffmpeg_write_image, ffmpeg_write_video
  File "C:\Python27\lib\site-packages\moviepy\video\io\ffmpeg_writer.py", line 15, in 
    from moviepy.config import get_setting
  File "C:\Python27\lib\site-packages\moviepy\config.py", line 38, in 
    FFMPEG_BINARY = get_exe()
  File "C:\Python27\lib\site-packages\imageio\plugins\ffmpeg.py", line 86, in get_exe
    raise NeedDownloadError('Need ffmpeg exe. '
imageio.core.fetching.NeedDownloadError: Need ffmpeg exe. You can download it by calling:
  imageio.plugins.ffmpeg.download()

What is the problem here, and how can i fix it?

Run in a python console/shell (e.g. IPython/IDLE shell):

>>> import imageio
>>> imageio.plugins.ffmpeg.download()

Moviepy uses the module imageio, which uses the program ffmpeg. It needs to download it before it can use it, and you can download it with the above imageio command.