Save Matplotlib Animation

I am trying to make an Animation of a wave package and save it as a movie. Everything except the saving is working. Can you please tell me what I am doing wrong? When going into the line ani.save('MovWave.mp4') he tells me:

    writer = writers.list()[0]
IndexError: list index out of range

I tried googling it of course, but I don't even know what it means.

UPDATE: I can call ffmpeg in console now. It says I have ffmpeg version 0.10.7-6:0.10.7-0jon1~precise installed. I updated the code and ran the program, but now I get the following error:

Traceback (most recent call last):
  ani.save('MovWave.mpeg', writer="ffmpeg")
  writer.grab_frame()
  dpi=self.dpi)
  self.canvas.print_figure(*args, **kwargs)
  self.figure.dpi = origDPI
  self.dpi_scale_trans.clear().scale(dpi, dpi)
  self._mtx = np.identity(3)
  from numpy import eye
  File "<frozen importlib._bootstrap>", line 1609, in _handle_fromlist
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

Update 2: Apparently there is a bug when using python 3.3 as doctorlove pointed out. I am now trying to use python 2.7 instead. Now it creates an mpeg-file but it cannot be played and it is only about ~150 kB big.

Update 3: Okay, so I tried the exact same code on my Win7 machine and it also works in python 3.3. But I have the same problem, I had earlier with python 2.7. The mpeg-file created cannot be played and is only a few hundred kB.

#! coding=utf-8
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import time
time.clock()

def FFT(x,y):
    X = (x[-1]-x[0])/len(y)
    f = np.linspace(-2*np.pi/X/2,2*np.pi/X/2,len(y))
    F = np.fft.fftshift(np.fft.fft(y))/np.sqrt(len(y))
    return(f,F)

def FUNCTION(k_0,dx,c,t):
    y = np.exp(1j*k_0*(x-c*t))*np.