[Matplotlib-users] matplotlib error on trying to use moviewriter

[partha <gho...@gm...>]

Dear All,

I am using Python 3.4.1 on Debian. Matplotlib works fine for me, but when I
try to save the animation using moviewriter I get error.

My program file:
************************** short test
program**************************************
#!/usr/bin/env python3

from matplotlib import animation as anim
from matplotlib import pyplot as plt
import numpy as np

fig = plt.figure()          # the basic canvas
plt.axis([-1,1,-1,1])       # set the x-axis
abcissa, = plt.plot([],[], color='black')
                            # initialise the x-axis
graph, = plt.plot([], [], color='blue')
                            # initialise the graph
t, = plt.plot([],[], color='red')

def init():
    x = np.arange(-1,1,0.01)# the x-values
    y = np.sin(np.pi/2 * x)
    abcissa.set_data(x, 0)  # draw the x-axis
    graph.set_data(x, y)    # draw the graph
    return abcissa, graph

def animate(i):
    p = -1 + i*0.02   # the pt p where the tangent is to be drawn
    tx = [p-1,p+1]
    ty = [np.sin(np.pi/2 * p) - np.pi/2 * np.cos(np.pi/2 *p),
          np.sin(np.pi/2 * p) + np.pi/2 * np.cos(np.pi/2 *p)]
    t.set_data(tx, ty)
    return t,
    
ani = anim.FuncAnimation(fig, animate, init_func=init,
                         frames=100, interval=30, blit=True)

##plt.show()
Writer = anim.writers['ffmpeg']
writer = Writer(fps=15, bitrate=1800)

ani.save('test.mp4', writer=writer)
********************end of
program*************************************************

plt.show() shows correctly; on trying to save as above I get the following
error:

**************error from python
******************************************************
Traceback (most recent call last):
  File "/home/partha/নথিপত্র/স্বরচিত/আমারপ্রোগ্রাম/test.py", line 48, in
<module>
    ani.save('test.mp4', writer=writer)
  File "/usr/lib/python3/dist-packages/matplotlib/animation.py", line 719,
in save
    writer.grab_frame(**savefig_kwargs)
  File "/usr/lib/python3/dist-packages/matplotlib/animation.py", line 205,
in grab_frame
    dpi=self.dpi, **savefig_kwargs)
  File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1422, in
savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/matplotlib/backend_bases.py", line
2225, in print_figure
    self.figure.dpi = origDPI
  File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 385, in
_set_dpi
    self.dpi_scale_trans.clear().scale(dpi, dpi)
  File "/usr/lib/python3/dist-packages/matplotlib/transforms.py", line 1786,
in clear
    self._mtx = np.identity(3)
  File "/usr/lib/python3/dist-packages/numpy/core/numeric.py", line 2053, in
identity
    from numpy import eye
  File "<frozen importlib._bootstrap>", line 2280, in _handle_fromlist
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0:
invalid start byte
*************end of
error****************************************************

As you can see from the first line of the error, my locale is set to bn_IN
(Bengali, India).

Any help in trying to resolve this problem would be highly appreciated.

With my thanks and regards,

partha



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