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• Python FuncAnimation is saved only 30%

  14 mars 2018, par cvut

  I am trying to make a movie out of data I’ve calculated. I am using ffmpeg writer. When I start the animation in Spyder it is working fine and goes to the end, but when I try to save it it goes only for first 30% of animation. How can I make it to save the whole animation ?

  Here is a bit of code( it’s long) ; MM is place where the matrices are stored (1200 of them).

  import matplotlib
  
  matplotlib.use("Agg")
  
  from mpl_toolkits.mplot3d import axes3d
  
  import matplotlib.animation as animation
  
  import numpy as np
  
  import matplotlib.pyplot as plt
  
  import matplotlib.cm as cm
  
  nx = 10
  
  ny = 10
  
  X=np.linspace(0, Lx, nx)
  
  Y=np.linspace(0, Ly, ny)   
  
  Writer = animation.writers['ffmpeg']
  
  writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1)
  
  
  
  plt.ion()
  
  fig = plt.figure()
  
  im = plt.contourf(X, Y, MM[0], np.linspace(T_ok,np.max(MM[-1]),150), cmap =     cm.hot)
  
  ax = fig.add_subplot(111, projection='3d')  
  
  plt.colorbar(im)
  
  
  
  def anime(i):
  
      ax.cla()
  
      im = ax.contourf(X, Y, MM[i], np.linspace(T_ok,np.max(MM[-1]),150), cmap = cm.hot)
  
      plt.title('%5.3f'%i)
  
      return im,
  
  
  
  anim = animation.FuncAnimation(fig, anime)
  
  anim.save('anime.mp4', writer=writer)

  EDIT : I just set frames to 10000 and it’s working, but I would like to know why. There are 1200 matrices that should be plotted.

• Batch ffmpeg change

  5 avril 2018, par AniEncoder

  I tried to change the font but it says .ass .text not found
  Its destination is set to another folder
  Files used horrible sub anime 1080p video
  for %%A in (*.mkv) do ffmpeg -i "%%A" -map 0:s:0 "%%A.ass"

  ren *.ass *.txt
  
  
  
  setlocal
  
  
  
  @echo off
  
  call :FindReplace "Open Sans Semibold" "CronosPro-Bold" "*.txt" 
  
  call :FindReplace "&H00020713" "&H0000003B" "*.txt" 
  
  call :FindReplace ",1.7," ",2," "*.txt" 
  
  @echo on
  
  
  
  ren *.txt *.ass
  
  
  
  for %%A in (*.mkv) do ffmpeg -i "%%A" -i "%%A".ass -c copy -map 0:0 -map 0:1 -map 1:0 -metadata:s:s:0 language=eng -disposition:s:0 default -attach CronosPro-Bold.ttf -metadata:s:3 mimetype=application/x-truetype-font "..\720p\%%A"
  
  
  
  del *.ass
  
  
  
  :FindReplace <findstr> <replstr> <file>
  
  set tmp="%temp%\tmp.txt"
  
  If not exist %temp%\_.vbs call :MakeReplace
  
  for /f "tokens=*" %%a in ('dir "%3" /s /b /a-d /on') do (
  
    for /f "usebackq" %%b in (`Findstr /mic:"%~1" "%%a"`) do (
  
      echo(&amp;Echo Replacing "%~1" with "%~2" in file %%~nxa
  
      &lt;%%a cscript //nologo %temp%\_.vbs "%~1" "%~2">%tmp%
  
      if exist %tmp% move /Y %tmp% "%%~dpnxa">nul
  
    )
  
  )
  
  
  
  del %temp%\_.vbs
  
  
  
  :MakeReplace
  
  >%temp%\_.vbs echo with Wscript
  
  >>%temp%\_.vbs echo set args=.arguments
  
  >>%temp%\_.vbs echo .StdOut.Write _
  
  >>%temp%\_.vbs echo Replace(.StdIn.ReadAll,args(0),args(1),1,-1,1)
  
  >>%temp%\_.vbs echo end with
  
  </file></replstr></findstr>

• Error while saving a matplotlib animation, missing 'dpi' argument

  27 septembre 2020, par aarcas

  I'm trying to save an animation of matplotlib.animation.AnimationFunc and I get an error saying 'dpi' argument missing. Obviously, I have the dpi set so I don't understand where this error comes from.

  



  I'm running python 3.6 and matplotlib 3.0.3, I also just installed ffmpeg from ubuntu official repositories (Ubuntu 18.04).

  



  This is the part of my code that should affect that, although I think it should be something of the system :

  



  Writer = writers['ffmpeg']
writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800,)
ani = FuncAnimation(fig, anime, interval=time_step *
                    10**3, frames=F, repeat=False,) 
ani.save('standard_map.mp4', writer=Writer, dpi=100)


  



  The errors is :

  



  with writer.saving(self._fig, filename, dpi):
File "/usr/lib/python3.6/contextlib.py", line 159, in helper
    return _GeneratorContextManager(func, args, kwds)
File "/usr/lib/python3.6/contextlib.py", line 60, in __init__
    self.gen = func(*args, **kwds) TypeError: saving() missing 1 required positional argument: 'dpi'


  



  I tried both adding the lines they suggested there and the error stills the same.

  



  plt.rcParams['animation.ffmpeg_path'] = '/usr/bin/ffmpeg'


  



  I also tried changing the writer to 'imagemagick' the one set on Ubuntu by default and the error persists.