Python unknown file extension .mp4

Question

I am working on a simulation project, however I am unable to create a visual. I started out by running code from matplotlib's documentation (i.e. the code does not belong to me). When I run the code, I get the error "unknown file extension: .mp4". I have installed ffmpeg and checked that it is an updated version.

I am using a Windows computer and Python 3.

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
plt.rcParams['animation.ffmpeg_path']='‪C:\\FFmpeg\bin\ffmpeg.exe'

# First set up the figure, the axis, and the plot element we want to animate
fig = plt.figure()
ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
line, = ax.plot([], [], lw=2)

# initialization function: plot the background of each frame
def init():
    line.set_data([], [])
    return line,

# animation function.  This is called sequentially
def animate(i):
    x = np.linspace(0, 2, 1000)
    y = np.sin(2 * np.pi * (x - 0.01 * i))
    line.set_data(x, y)
    return line,

# call the animator.  blit=True means only re-draw the parts that have changed.
anim = animation.FuncAnimation(fig, animate, init_func=init,
                               frames=200, interval=20, blit=True)

# save the animation as an mp4.  This requires ffmpeg or mencoder to be
# installed.  The extra_args ensure that the x264 codec is used, so that
# the video can be embedded in html5. 
anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])

plt.show()

Answer 1

writergif = animation.PillowWriter(fps=30)
anim.save('filename.gif',writer=writergif)

These lines of code worked for me, got them from https://holypython.com/how-to-save-matplotlib-animations-the-ultimate-guide/