animation - FFMPEG file writer in python 2.7 -


trying animate string in python, think code fine having difficulties file writer. code (based off https://jakevdp.github.io/blog/2012/08/18/matplotlib-animation-tutorial/):

import numpy np import scipy sci import matplotlib.pyplot plt import matplotlib.animation animation plt.rcparams['animation.ffmpeg_path'] = 'c:\ffmpeg\bin\ffmpeg'   s1=10.15 gamma=(np.pi*np.sqrt(2))/2 gamma=sci.special.jn_zeros(0,10) gamma1=gamma[9] gamma2=gamma[8] print gamma1,gamma2  sigma=np.linspace(0,2*s1,10000)  def xprime(sigma,t):     alpha = gamma1*(np.cos(np.pi*t/s1)*np.cos((np.pi*sigma)/s1))     beta = gamma1*(np.sin(np.pi*t/s1)*np.sin((np.pi*sigma)/s1))     xprime=np.cos(alpha)*np.cos(beta)     return xprime  def yprime(sigma,t):     alpha = gamma2*(np.cos(np.pi*t/s1)*np.cos((np.pi*sigma)/s1))     beta = gamma2*(np.sin(np.pi*t/s1)*np.sin((np.pi*sigma)/s1))     yprime=np.cos(alpha)*np.sin(beta)     return yprime  fig = plt.figure() ax = plt.axes(xlim=(-0.4, 0.4), ylim=(-3, 3)) line, = ax.plot([], [], lw=2)  def init():     line.set_data([], [])     return line,  def animate(i):     sigma=np.linspace(0,2*s1,10000)     t = (i*2*s1)/200     yint=sci.integrate.cumtrapz(yprime(sigma,t),sigma)     xint=sci.integrate.cumtrapz(xprime(sigma,t),sigma)     line.set_data(xint, yint)     return line,   anim = animation.funcanimation(fig, animate, init_func=init,                            frames=200, interval=20, blit=true)  ffwriter=animation.ffmpegwriter() anim.save('basic_animation.mp4', writer=ffwriter, fps=30, extra_args=['-vcodec', 'libx264'])  plt.show()

currently getting error message 

runtimeerror: passing in values arguments arguments fps, codec, bitrate, extra_args, or metadata not supported when writer existing moviewriter instance. these should instead passed arguments when creating moviewriter instance.'

i think error in calling or placement of ffmpeg file i'm unsure i'm doing wrong. obvious can't see @ moment / unsure error message means.

have tried error says? passing arguments in constructor:

ffwriter=animation.ffmpegwriter(fps=30, extra_args=['-vcodec', 'libx264']) anim.save('basic_animation.mp4', writer=ffwriter)

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