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• Can't save matplotlib animation

  19 novembre 2014, par renger

  I am trying to get a simple animation saved using ffmpeg. I followed a tutorial to install ffmpeg, and I can now access it from the command prompt.

  Now I run this piece of code :

  import numpy as np
  
  from matplotlib import pyplot as plt
  
  from matplotlib import animation
  
  
  
  fig = plt.figure()
  
  ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
  
  line, = ax.plot([], [], lw=2)
  
  
  
  def init():
  
      line.set_data([], [])
  
      return line,
  
  
  
  def animate(i):
  
      x = np.linspace(0, 2, 1000)
  
      y = np.sin(2 * np.pi * (x - 0.01 * i))
  
      line.set_data(x, y)
  
      return line,
  
  
  
  anim = animation.FuncAnimation(fig, animate, init_func=init,
  
                                 frames=200, interval=20, blit=True)
  
  
  
  mywriter = animation.FFMpegWriter()
  
  anim.save('mymovie.mp4',writer=mywriter)
  
  
  
  plt.show()

  I get this error :

  Traceback (most recent call last):
  
    File "<stdin>", line 1, in <module>
  
     File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 523, in runfile
  
      execfile(filename, namespace)
  
    File "C:\Users\Renger\.xy\startups\b.py", line 23, in <module>
  
      anim.save('mymovie.mp4',writer=mywriter)
  
    File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 609, in save
  
      with writer.saving(self._fig, filename, dpi):
  
    File "C:\Python27\lib\contextlib.py", line 17, in __enter__
  
      return self.gen.next()
  
    File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 166, in saving
  
      self.setup(*args)
  
    File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 156, in setup
  
      self._run()
  
    File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 183, in _run
  
      stdin=subprocess.PIPE)
  
    File "C:\Python27\lib\subprocess.py", line 711, in __init__
  
      errread, errwrite)
  
    File "C:\Python27\lib\subprocess.py", line 948, in _execute_child
  
      startupinfo)
  
  WindowsError: [Error 2] Het systeem kan het opgegeven bestand niet vinden
  
  </module></module></stdin>

  The last dutch sentence does mean something like : The system can’t find the specified file.

  What do these errors mean, and how can I solve them ?

• How to get video frame with without errors with FFMpeg ?

  30 avril 2021, par Kyryl Zotov

  I'm getting frame from video with FFMPEG and its working great except this when I want to get latest second frame.

  


  Video is 15.000 seconds.
But when I want exact that one or even 14.950 its not working.
When I try to get 14.800 it works, is there any way to setup ffpmeg to give closes result if it can't get frame ?

  


  My Command
ffmpeg -ss 00:15:00.000 -i input -vframes 1 -q:v 2 output.jpg

  


• FFMPEG install on server

  23 juillet 2013, par s19k15

  I have an online server (shared hosting plan) in linux, i do not know a lot stuff about linux and i am trying to install ffmpeg.

  I have tryied a lot of scripts but no luck.
  Now i am trying to install the below script via putty.
  <a href="https://github.com/heidisoft/FFMPEG-install-script-for-shared-host" rel="nofollow">https://github.com/heidisoft/FFMPEG-install-script-for-shared-host</a>

  When the install was running i get this message and the installation stops...

  Installation of MPlayer-1.0rc1.tar.bz2 ....... started
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100  1233  100  1233    0     0   7713      0 --:--:-- --:--:-- --:--:--  7803
  
  bzip2: (stdin) is not a bzip2 file.
  
  tar: Child returned status 2
  
  tar: Error is not recoverable: exiting now
  
  mplayer.sh: line 32: cd: MPlayer-1.0rc1/: No such file or directory
  
  mplayer.sh: line 33: ./configure: No such file or directory
  
  make: *** No targets specified and no makefile found.  Stop.
  
  make: *** No rule to make target `install'.  Stop.
  
  cp: cannot stat `etc/codecs.conf': No such file or directory
  
  Installation of MPlayer-1.0rc1.tar.bz2 ....... Completed
  
  
  
          Mplayer installation Failed :( , please visit the forum

  What can i do to install ??? Thanks !