How can I overcome this key word error?

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enter code here

 # -*- coding: utf-8 -*-

import math
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as animation
fig1=plt.figure()
ax=plt.axes(xlim=(-10,10), ylim=(-10,10))
line,=ax.plot([],[],lw=1)
"""def init ():
line.set_data([],[])
return line,"""

dt=0.001
X=[]
Y=[]
r=float(input("Enter the radius :: "))
w=float(input("Enter angular frequency :: "))
def run(data):
    t=0
    while w*t<=2*math.pi:
       x=r*math.cos(w*t)
       y=r*math.sin(w*t)
       X.append(x)
       Y.append(y)
       t=t+dt
    line.set_data(X,Y)
    return line,   
line,=ax.plot(X,Y,lw=2) 
FFMpegWriter = animation.writers['ffmpeg']
writer = FFMpegWriter(fps=15, metadata=dict(artist='Me'),        bitrate=1800)   
anim=animation.FuncAnimation(fig1,run,frames=200,interval=20,blit=True)
anim.save('amim.mp4',writer=writer)       

The error message shown is ::

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/tathagata/anaconda3/lib/python3.4/site-   packages/spyderlib/widgets/externalshell/sitecustomize.py", line 685, in runfile
execfile(filename, namespace)
File "/home/tathagata/anaconda3/lib/python3.4/site-  packages/spyderlib/widgets/externalshell/sitecustomize.py", line 85, in execfile
exec(compile(open(filename, 'rb').read(), filename, 'exec'), namespace)
File "/home/tathagata/Documents/Python scripts/circleamim.py", line 35, in <module>
FFMpegWriter = animation.writers['ffmpeg']
File "/home/tathagata/anaconda3/lib/python3.4/site-packages/matplotlib/animation.py", line 81, in __getitem__
return self.avail[name]
KeyError: 'ffmpeg' 

I use anacoda distribution and SPYDER as my IDE. I have seen the many solutions related to key errors. But the movie wont run. How can I make the movie to run? I hope there are no other logical errors.


First install ffmpeg and add path to ffmpeg

# on windows
plt.rcParams['animation.ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe'
# on linux
plt.rcParams['animation.ffmpeg_path'] = u'/home/username/anaconda/envs/env_name/bin/ffmpeg'    

Note for linux users: The path for ffmpeg can be found by simply using which: which ffmpeg

Also instead of

FFMpegWriter = animation.writers['ffmpeg']
writer = FFMpegWriter(fps=15, metadata=dict(artist='Me'),        bitrate=1800)

I just used writer = animation.FFMpegWriter()

How can I overcome this key word error?, First install ffmpeg and add path to ffmpeg # on windows plt.rcParams['animation.​ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe' # on linux plt. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number. Site Feedback


It seems that ffmpegis not installed on your system. Try the following code:

import matplotlib.animation as animation
print(animation.writers.list())

It will print out a list of all available MovieWriters. If ffmpegis not among it, you need to install it first from the ffmpeg homepage.

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If you have Homebrew, literally just run the command

brew install ffmpeg

And Homebrew will take care of the rest (dependencies, etc). If you don't, I would recommend getting Homebrew or something like it (apt-get on Linux is built in, or an alternative on OS X would be Macports)

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I have also posed with same problem(keyError: 'ffmpeg') but instead of using anakonda, I used IDLE3. So, first i checked for 'ffmpeg' in terminal it wasn't installed so installed it.

Using: sudo apt install ffmpeg

and when I run my save_animation program, it worked generating animation files in '.mpeg' format.

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