Matplotlib - backgroud transparent

[mfnpvh]

I'm using matplotlib in package Moviepy, I want to know is it possible make backgroud transparent with plotting bar.

import matplotlib.pyplot as plt
import numpy as np
from moviepy.editor import VideoClip
from moviepy.video.io.bindings import mplfig_to_npimage

x = np.linspace(-2, 2, 200)

duration = 2

fig, ax = plt.subplots()
def make_frame(t):
    ax.clear()
    ax.plot(x, np.sinc(x**2) + np.sin(x + 2*np.pi/duration * t), lw=3)
    ax.set_ylim(-1.5, 2.5)
    return mplfig_to_npimage(fig)

animation = VideoClip(make_frame, duration=duration)
animation.write_gif('matplotlib.gif', fps=20)

As far as I know, the method savefig has attribute transparent, but in this case, is it possible to make backgroud transparent？

[OsaAjani]

Fixed with v2.1.2