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• Ffmpeg hd video editing

  31 août 2012, par Batuhan Topbaş

  I have vps server and i setup ffmpeg succesfully. I downloaded 720p hd video. I need only add text on video. And i added succesfuly but video quality is very low after adding. I use this command

  ffmpeg -i a.mp4 -vf "drawtext=fontsize=30:box=1:fontfile=/usr/share/fonts/a.ttf:text='Stack Overflow':x=(w-text_w)/2:y=(h-text_h-line_h)/2" -strict -2 c.mp4

  I dont know -strict -2 command. i try and ffmpeg error say add -strict -2 then i add. Now i need only add text, not change video quality.

• Nginx - How and when are "exec" commands executed

  14 juillet 2015, par user1767754

  I have a config file

  rtmp{
  
      server{
  
          listen 1935;
  
          application publish {
  
          live on;
  
  
  
          exec touch /Users/chaleon/Desktop/myfile.txt;
  
          }
  
      }
  
  }

  1) Is the exec command activated when i call rtmp ://192.168.1.3:1935/publish ?

  Thats what i am expecting, but calling the addresse over vlc, will not cause the exec to run. However i’ve already managed to setup streaming from ffmpeg to a nginx application, which was accessible.

• Can't save matplotlib animation (ffmpeg)

  25 mai 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 ?

  Best,