Can't save matplotlib animation

You need to specify your path to ffmpeg:

On linux I use:

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
plt.rcParams['animation.ffmpeg_path'] = '/usr/bin/ffmpeg'

You will obviously have to point to your windows .exe instead of '/usr/bin/ffmpeg'

If you don't have ffmpeg installed, you can get it here

for some animation "anim" i use on windows:

plt.rcParams['animation.ffmpeg_path'] ='E:\\Media\\ffmpeg\\bin\\ffmpeg.exe'
FFwriter = animation.FFMpegWriter()
anim.save('basic_animation.mp4', writer = FFwriter, fps=30)

where path should be with \ \ and not with / or \ between folders