ani = animation.FuncAnimation(fig, animate, np.arange(1, len(y)),
    interval=25, blit=True, init_func=init)

ani.save('double_pendulum.mp4', fps=15)
---------------------------------------------------------------------------
UnicodeDecodeError                        Traceback (most recent call last)
<ipython-input-8-34073d277633> in <module>()
     85     interval=25, blit=True, init_func=init)
     86 
---> 87 ani.save('double_pendulum.mp4', fps=15)
     88 #plt.show()

C:\Anaconda\lib\site-packages\matplotlib\animation.pyc in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
    750                     #TODO: Need to see if turning off blit is really necessary
    751                     anim._draw_next_frame(d, blit=False)
--> 752                 writer.grab_frame(**savefig_kwargs)
    753 
    754         # Reconnect signal for first draw if necessary

C:\Anaconda\lib\contextlib.pyc in __exit__(self, type, value, traceback)
     22         if type is None:
     23             try:
---> 24                 self.gen.next()
     25             except StopIteration:
     26                 return

C:\Anaconda\lib\site-packages\matplotlib\animation.pyc in saving(self, *args)
    175         self.setup(*args)
    176         yield
--> 177         self.finish()
    178 
    179     def _run(self):

C:\Anaconda\lib\site-packages\matplotlib\animation.pyc in finish(self)
    356         # are available to be assembled.
    357         self._run()
--> 358         MovieWriter.finish(self)  # Will call clean-up
    359 
    360         # Check error code for creating file here, since we just run

C:\Anaconda\lib\site-packages\matplotlib\animation.pyc in finish(self)
    194     def finish(self):
    195         'Finish any processing for writing the movie.'
--> 196         self.cleanup()
    197 
    198     def grab_frame(self, **savefig_kwargs):

C:\Anaconda\lib\site-packages\matplotlib\animation.pyc in cleanup(self)
    366 
    367     def cleanup(self):
--> 368         MovieWriter.cleanup(self)
    369 
    370         #Delete temporary files

C:\Anaconda\lib\site-packages\matplotlib\animation.pyc in cleanup(self)
    230                        'Command stdout:\n%s' % out, level='debug')
    231         verbose.report('MovieWriter -- '
--> 232                        'Command stderr:\n%s' % err, level='debug')
    233 
    234     @classmethod

UnicodeDecodeError: 'ascii' codec can't decode byte 0x84 in position 5: ordinal not in range(128)