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• Trouble saving matplotlib animation with ffmpeg

  21 avril 2017, par kevinkayaks

  I installed ffmpeg and would like to save an animation.

  My code is

  #evo is the dataset composed of sequence of images
  
  
  
  evo = np.load('bed_evolution_3000iter_2.npy')
  
  fig = plt.figure(figsize=(15,15*2*width/length))
  
  # make axesimage object
  
  # the vmin and vmax here are very important to get the color map correct
  
  im = plt.imshow(np.transpose(evo[0]), cmap=plt.get_cmap('jet'), vmin=0, vmax=1300)
  
  cbar_ax = fig.add_axes([0.85, 0.15, 0.05, 0.7])
  
  fig.colorbar(im, cax=cbar_ax)
  
  fig.subplots_adjust(right=0.8)
  
  
  
  def updatefig(j):    
  
      # set the data in the axesimage object
  
      im.set_array(np.transpose(evo[j]))
  
      # return the artists set
  
      return im,
  
  # kick off the animation
  
  ani = animation.FuncAnimation(fig, updatefig, frames=range(len(evo)), 
  
                            interval=100, blit=True)
  
  
  
  #now just need to get the ability to save... this uses 
  
  
  
  FFwriter = animation.FFMpegWriter()
  
  ani.save('basic_animation.mp4', writer = FFwriter, fps=30, extra_args =([vcodec', 'libx264'])

  The animation runs and it looks good, but I just can’t get it to save. The error message (at this stage) is

  

  I am not sure what’s going wrong. Any help is appreciated.

  EDIT :
  Following Can’t save matplotlib animation I added

  plt.rcParams['animation.ffmpeg_path'] ='C:\\Program Files\\ffmpeg  \\bin\\ffmpeg.exe'

  Which returns
  Warning : Cannot change to a different GUI toolkit : qt. Using qt4 instead.
  ERROR : execution aborted

• How do I run ffmpeg with PHP on a Mac with XAMPP

  8 avril 2017, par Please Help

  There is literally nothing on this anywhere, the little there is does not work and is too advanced for me. If you can answer this you would make my life. How do I run ffmpeg commands from php which is running on my localhost ? I prefer XAMPP, but MAMP will do just fine, at this stage I will use anything. Do I need to install ffmpeg on the XAMPP server itself, or does it just need to be installed on the mac ? I can run the ffmpeg commands fine from terminal, for example,

  ffmpeg -i Tmpfile.mp4 -c:v libx264 -preset ultrafast video.mp4

  works fine, but

  echo shell_exec("ffmpeg -i Tmpfile.mp4 -c:v libx264 -preset ultrafast video.mp4");

  does nothing when I load the webpage with the index.php that that code is in.

  I will buy you a cookie if you can solve my problem :)

• How do I run ffmpeg with PHP on a Mac

  8 avril 2017, par Please Help

  There is literally nothing on this anywhere, the little there is does not work and is too advanced for me. If you can answer this you would make my life. How do I run ffmpeg commands from php which is running on my localhost ? I prefer XAMPP, but MAMP will do just fine, at this stage I will use anything. Do I need to install ffmpeg on the XAMPP server itself, or does it just need to be installed on the mac ? I can run the ffmpeg commands fine from terminal, for example,

  ffmpeg -i Tmpfile.mp4 -c:v libx264 -preset ultrafast video.mp4

  works fine, but

  echo shell_exec("ffmpeg -i Tmpfile.mp4 -c:v libx264 -preset ultrafast video.mp4");

  does nothing when I load the webpage with the index.php that that code is in.

  I will buy you a cookie if you can solve my problem :)