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• Running matplotlib animation on Mac using Spyder : says to install ffmpeg

  28 avril 2017, par Addem

  I installed Anaconda on a new Mac, made a simple animation with matplotlib like

  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)
  
  
  
  
  
  anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])
  
  
  
  plt.show()

  When I run it, it tells me to install ffmpeg. I tried using these instructions : http://stephenjungels.com/jungels.net/articles/ffmpeg-howto.html But the instructions were unclear about what I was supposed to download, especially when it got to the part about a "patch". This also just feels insanely complicated for something that seems like it should be much simpler. I also tried following some instructions for installing ffmpeg using Homebrew but the instructions were again poorly written so that some of the buttons it said should be there weren’t. I tried to figure it out by guessing what I should do, and it seemed to work but with a lot of warning messages. By the end of the process, when I type into a terminal

  which ffmpeg

  it returns /usr/local/bin/ffmpeg. However, even after restarting Spyder and re-running the code, it still tells me to install ffmpeg. I also navigated to /usr/local/bin and it doesn’t have a folder ffmpeg. So my guess is that ffmpeg didn’t install.

  I read in the matplotlib documentation that Anaconda doesn’t give a build for Python that is appropriate, something about a "framework" build (http://matplotlib.org/faq/osx_framework.html). But it says that in Anaconda you can install it easily by running conda install python.app which I did and it worked. It then says to use pythonw rather than python. I’m not really sure what this means, because in Spyder I don’t run scripts from the terminal. I tried navigating to the file anyway and running it with

  pythonw anim.py

  and it mysteriously gave me an I/O error.

  Do I really need to install ffmpeg or is there some simpler fix ?

  If I do need to install ffmpeg, where get I get up-to-date instructions that make the process clear ?

• Centos : yum install ffmpeg fails ?

  23 mars 2017, par David Hope

  I’m trying to install ffmpeg on my server.

  The problem is that when i run the following command :

  yum install ffmpeg

  I get the following error :

  http://apt.sw.be/redhat/el6/en/x86_64/dag/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'"
  
  Trying other mirror.
  
  Error: Cannot retrieve repository metadata (repomd.xml) for repository: dag. Please verify its path and try again

  I have this is in etc/yum.repos.d/CentOS-Base.repo

  [dag]
  
  name=Dag RPM Repository for Centos
  
  baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
  
  enabled=1

  I know the issue is the http://apt.sw.be as they are down...

  I cannot find an alternative mirrors for it... could someone please let me know if there are any working mirrors for this ?

• Install ffmpeg with laravel on elastic beanstalk

  21 mars 2017, par comos234

  My Laravel application needs to use the ffmpeg library.I need it to get a thubmnail image from an input video file. On my local system , I have used http://tipsonubuntu.com/2016/11/02/install-ffmpeg-3-2-via-ppa-ubuntu-16-04/ and https://github.com/PHP-FFMpeg/PHP-FFMpeg composer package . But I dont know how to include the ffmpeg library on elastic beanstalk. Can someone please tell me the procedure ? I have read that you may have to put it in a .ebextensions directory, but I dont know how to do that. I have tried this link Install ffmpeg on elastic beanstalk using ebextensions config but it doesn’t work.