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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 ?

• Change ffmeg output to mp4 format

  10 juin 2014, par user1580508

  Hello I would like to change the following below so that the output would be mp4 or a format that will also work on mobile devices. What do I need to change ?

          $sFfmpegPath = "/usr/local/bin/ffmpeg"; 
  
  
  
          $image  = $uploaded_path.$timeStamp.".jpg";
  
          if($imgSize!=''){
  
              $mainimage  = $uploaded_path.$timeStamp."_".$imgSize.".jpg";
  
          }
  
          $thumbnail=$timeStamp.".jpg";
  
          //$videoSize = '640x480';
  
          if($fileExt[count($fileExt)-1]!='flv'){
  
              //$command = $sFfmpegPath." -i ".$sFilesPath." -ar 22050 -ab 32 -f flv -s ". $VideoSize ." ".$destFile;
  
              $command = $sFfmpegPath." -i ".$sFilesPath." -s 640x480 -ar 44100 -async 44100 -r 59.970 -ac 2 -qscale 5 ".$destFile;
  
              exec($command);
  
          }else{
  
              copy($sFilesPath, $destFile);
  
          }
  
          $iSecond = 1000;
  
          $sInput = " -y -i ";
  
          //$ThumbSize = '200x150';
  
          //$sCommand = $sFfmpegPath.$sInput.$sFilesPath . " -ss " . $iSecond . " -vframes 1 -an -sameq -f image2 -s " . $ThumbSize . " " . $image;
  
          //$sCommand = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 4 -t 0.001 " . $image;
  
          //$sCommand = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 8 -sameq -t 0.001 -s 320*240 " . $image;
  
  
  
          //$sCommand =  $sFfmpegPath.$sInput.$sFilesPath." -vf thumbnail,scale=300:200 -frames:v 1". $image;
  
          $sCommand = $sFfmpegPath." -itsoffset -4  -i ".$sFilesPath." -vcodec mjpeg -vframes 1 -an -f rawvideo -s 640x480 ".$image;
  
          //-y -f image2 -ss 8 -sameq -t 0.001 -s 320*240
  
          $convert = exec($sCommand);
  
          if($imgSize!=''){
  
              //$sCommand1 = $sFfmpegPath.$sInput.$sFilesPath . " -ss " . $iSecond . " -vframes 1 -an -sameq -f image2 -s " . $imgSize . " " . $mainimage;
  
  
  
              //$sCommand1 = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 8 -sameq -t 0.001 -s 320*240 " . $image;
  
  
  
              //$sCommand1 = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 4 -t 0.001 " . $image;
  
              //$convert1 = exec($sCommand1);
  
          }
  
          //unlink($file_dest);
  
  
  
          return $timeStamp;

• Mixing two live streams like picture in picture from 2 obs using FFmpeg

  4 septembre 2020, par Argu

  I am trying to get live streams from 2 OBS and do picture in picture using FFMPEG. But I am getting error as : ' Cannot open connection tcp ://127.0.0.1:1935 ?listen&listen_timeout=-1000
rtmp ://127.0.0.1:1935/obs/test : Immediate exit requested'. I think this is because of IP adresses. Can someone help me with guiding me to what IP's to add and also with the overlay command.