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• How do I search for files inside a directory, then burn the name of that directory into the files inside using ffmpeg ?

  23 janvier 2021, par ematogra

  I'm struggling to articulate this question- but I'm after a way of searching for files inside any directory that may exist in my search area (ie. not specifying the name of the directory), then using that directory name as a burn in on the files I have inside it, using ffmpeg ?

  


  So for example, say I had a folder with my script inside it. I've just created a folder called "day 01" inside the folder with the script, with some mxf files inside that. If I run my script, I want it to find the mxf files inside "day 01" then run ffmpeg and have that write "day 01" as a burn in on the picture of those mxf files.

  


  I know how to do the burn in, I just don't know how to reference the directory "day 01".

  


  Hope that makes sense. Thanks in advance.

  


• 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.

• How to merge 3 video in one screen with blur

  12 avril 2019, par Fejor

  How to merge 3 videos on one screen, with blur on 2 of videos

  I already wrote code and it’s look likes this

  ffmpeg -i input.avi input1.avi input2.avi -filter_complex "[0:v]gblur=sigma=6.5[v10];[1:v][v11];[2:v]gblur=sigma=6.5[v12];[v10][v11][v12]hstack=inputs=3[v]" -map "[v]" output.avi 

  And i get error like this

      o such filter: ''
  
  Error initializing complex filters.
  
  Invalid argument

  What i should do ?