N Pendlum example can't make the ogv movies anymore

[moorepants]

This may be related to an upgrade in ubuntu and ffmpeg.

See this issue:

matplotlib/matplotlib#2764

[amunizp]

Does not work on windows 7 using VERSION 1.3.1 of matplotlib.

Sample code

# -*- coding: utf-8 -*-
"""
Created on Thu Dec 11 11:52:11 2014

@author: amp
http://matplotlib.org/examples/index.html#examples-index

"""
# This example uses a MovieWriter directly to grab individual frames and
# write them to a file. This avoids any event loop integration, but has
# the advantage of working with even the Agg backend. This is not recommended
# for use in an interactive setting.
# -*- noplot -*-

import numpy as np
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as manimation

FFMpegWriter = manimation.writers['ffmpeg']
metadata = dict(title='Movie Test', artist='Matplotlib',
        comment='Movie support!')
writer = FFMpegWriter(fps=15, metadata=metadata)

fig = plt.figure()
l, = plt.plot([], [], 'k-o')

plt.xlim(-5, 5)
plt.ylim(-5, 5)

x0,y0 = 0, 0

with writer.saving(fig, "writer_test2.ogv", 100):
    for i in range(100):
        x0 += 0.1 * np.random.randn()
        y0 += 0.1 * np.random.randn()
        l.set_data(x0, y0)
        writer.grab_frame()

[moorepants]

@amunizp It would probably be better to report this on matplotlib's issue tracker.