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• Animation freezes after a number of frames after upgrading Matplotlib

  9 mars 2018, par Oliver von Baron

  I recently updated my matplotlib python package to version 2.2.0, and now some previously working code to save an animation does not work. Instead of saving an animation, the code freezes at a certain iteration number. It becomes unresponsive to interrupts and throws a PyEval_RestoreThread fatal error when I manage to close the command window.

  I am using Enthought Canopy. The code still works as normal with other versions of python and matplotlib.

  I can replicate the problem with this :

  import matplotlib.pyplot as plt
  
  import matplotlib.animation as animation
  
  import numpy as np
  
  
  
  SIZE = 128
  
  fig, ax = plt.subplots()
  
  
  
  ims = ax.imshow(np.random.rand(SIZE, SIZE))
  
  
  
  i = 0
  
  def update_animation(*args):
  
      global i
  
      i = i + 1
  
      image = np.random.rand(SIZE, SIZE)
  
      ims.set_data(image)
  
      print "Iteration "+str(i)
  
  
  
  F_NAME = "anim_test.mp4"
  
  NUM_ITERS = 1000
  
  FFwriter = animation.FFMpegWriter(fps=6, bitrate=500)
  
  anim=animation.FuncAnimation(fig,update_animation,frames=NUM_ITERS,blit=False, repeat=False, interval=200)
  
  anim.save(F_NAME, writer=FFwriter)    
  
  print "saved animation to " + F_NAME

  Changing the bitrate parameter changed the number of the frame the program halts at. For bitrate=500, it halts around frame 46.

  How can I stop pyplot freezing before all frames can be saved ?

  EDIT
  My system details :
  Python 2.7.6 64bit Enthought Canopy
  Windows 8
  8GB RAM
  ffmpeg version N-79075-ga7b8a6e

• Updated version number.

  14 mai 2014, par blueimp

  Updated version number.

• Updated version number.

  19 janvier 2014, par blueimp

  Updated version number.