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• Anomalie #3495 : Il manque peut-être un accent à icône

  3 juillet 2015

  wikipedia préfère icône
  https://fr.wikipedia.org/wiki/Ic%C3%B4ne

  je serais pour laisser le chapeau pour éviter la confusion avec l’anglais

• Compiling FFMPEG for android NDK r9d

  17 juillet 2014, par jawad bin zafar

  I am working on a project in which I need to use FFMPEG for video editing. I have a very short time and compiling takes to much time of me. I have search many tutorial on the web and but no one seem to be working. Some have missing configure file some have command which are broken etc.

  My Question is weather it is necessary to compile FFMPEG with you NDK or we can use a precompile library or we can sign a compile library with our NDK signature.

  Any one knows a working step by step guide to compile and use the compile library into your project.

  Thanks

• FFMPEG file writer in python 2.7

  6 avril 2017, par byBanachTarskiIamcorrect

  Trying to animate a string in python, i think my code is fine but just having difficulties with the file writer. My code is (based off https://jakevdp.github.io/blog/2012/08/18/matplotlib-animation-tutorial/) :

  import numpy as np
  
  import scipy as sci
  
  import matplotlib.pyplot as plt
  
  import matplotlib.animation as animation
  
  plt.rcParams['animation.ffmpeg_path'] = 'C:\FFMPEG\bin\ffmpeg'
  
  
  
  
  
  s1=10.15
  
  gamma=(np.pi*np.sqrt(2))/2
  
  gamma=sci.special.jn_zeros(0,10)
  
  gamma1=gamma[9]
  
  gamma2=gamma[8]
  
  print gamma1,gamma2
  
  
  
  sigma=np.linspace(0,2*s1,10000)
  
  
  
  def xprime(sigma,t):
  
      alpha = gamma1*(np.cos(np.pi*t/s1)*np.cos((np.pi*sigma)/s1))
  
      beta = gamma1*(np.sin(np.pi*t/s1)*np.sin((np.pi*sigma)/s1))
  
      xprime=np.cos(alpha)*np.cos(beta)
  
      return xprime
  
  
  
  def yprime(sigma,t):
  
      alpha = gamma2*(np.cos(np.pi*t/s1)*np.cos((np.pi*sigma)/s1))
  
      beta = gamma2*(np.sin(np.pi*t/s1)*np.sin((np.pi*sigma)/s1))
  
      yprime=np.cos(alpha)*np.sin(beta)
  
      return yprime
  
  
  
  fig = plt.figure()
  
  ax = plt.axes(xlim=(-0.4, 0.4), ylim=(-3, 3))
  
  line, = ax.plot([], [], lw=2)
  
  
  
  def init():
  
      line.set_data([], [])
  
      return line,
  
  
  
  def animate(i):
  
      sigma=np.linspace(0,2*s1,10000)
  
      t = (i*2*s1)/200
  
      yint=sci.integrate.cumtrapz(yprime(sigma,t),sigma)
  
      xint=sci.integrate.cumtrapz(xprime(sigma,t),sigma)
  
      line.set_data(xint, yint)
  
      return line,
  
  
  
  
  
  anim = animation.FuncAnimation(fig, animate, init_func=init,
  
                             frames=200, interval=20, blit=True)
  
  
  
  FFwriter=animation.FFMpegWriter()
  
  anim.save('basic_animation.mp4', writer=FFwriter, fps=30, extra_args=['-vcodec', 'libx264'])
  
  
  
  plt.show()

  Currently getting the error message

  RuntimeError: Passing in values for arguments for arguments fps, codec, bitrate, extra_args, or metadata is not supported when writer is an existing MovieWriter instance. These should instead be passed as arguments when creating the MovieWriter instance.'

  I think my error is in the calling or placement of the FFMpeg file but i’m unsure what i’m doing wrong. Probably very obvious but can’t see it at the moment / unsure what the error message actually means.