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• How to fixed error "Encoding Failed" using FFMPEG ?

  17 août 2021, par Irshad Khan

  I am using FFMPEG for converting mp4 to m3u8 format on Ubuntu local machine. But I am facing error "Encoding Failed". MY controller code is

  


  FFMpeg::open(public_path()."/uploads/".$filename)
        ->exportForHLS()
        ->addFormat($lowBitrate)
        ->addFormat($midBitrate)
        ->addFormat($highBitrate)
        ->toDisk(env('APP_ENV'))
        ->save(public_path().'/converted/adaptive_steve.m3u8');


  


  error is :

  


  

  


  Config file is

  


  

  


  How can I solve this. Thanks

  


• Making animations by matplotlib and saving the video files

  20 janvier 2016, par Richard.L

  I have been studying the 1D wave equations and making the animation of the equation. But there are some problems when using the anim.save of animation to save the video file. I have already installed ffmpeg on my computer (a Windows machine) and set the environment variables. But it keeps telling me this :

  UserWarning: MovieWriter ffmpeg unavailable
  
  ...
  
  RuntimeError: Error creating movie, return code: 4 Try running with --verbose-debug

  

  Here is my code :

  from numpy import zeros,linspace,sin,pi
  
  import matplotlib.pyplot as mpl
  
  from matplotlib import animation
  
  mpl.rcParams['animation.ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe'
  
  
  
  def I(x):
  
      return sin(2*x*pi/L)
  
  
  
  def f(x,t):
  
      return sin(0.5*x*t)
  
  
  
  def solver0(I,f,c,L,n,dt,t):
  
      # f is a function of x and t, I is a function of x
  
      x = linspace(0,L,n+1)
  
      dx = L/float(n)
  
      if dt <= 0:
  
          dt = dx/float(c)
  
      C2 = (c*dt/dx)**2
  
      dt2 = dt*dt
  
      up = zeros(n+1)
  
      u = up.copy()
  
      um = up.copy()
  
      for i in range(0,n):
  
          u[i] = I(x[i])
  
      for i in range(1,n-1):
  
          um[i] = u[i]+0.5*C2*(u[i-1] - 2*u[i] + u[i+1]) + dt2*f(x[i],t)
  
      um[0] = 0
  
      um[n] = 0    
  
      while t <= tstop:
  
          t_old = t
  
          t += dt
  
          #update all inner points:
  
          for i in range(1,n-1):
  
              up[i] = -um[i] + 2*u[i] + C2*(u[i-1] - 2*u[i] + u[i+1]) + dt2*f(x[i],t_old)    
  
          #insert boundary conditions:
  
          up[0] = 0
  
          up[n] = 0
  
          #update data structures for next step
  
          um = u.copy()
  
          u = up.copy()   
  
      return u
  
  
  
  c = 1.0 
  
  L = 10
  
  n = 100
  
  dt = 0
  
  tstop = 40
  
  
  
  fig = mpl.figure()
  
  ax = mpl.axes(xlim=(0,10),ylim=(-1.0,1.0))
  
  line, = ax.plot([],[],lw=2)
  
  
  
  def init():
  
      line.set_data([],[])
  
      return line,
  
  
  
  def animate(t):
  
      x = linspace(0,L,n+1)
  
      y = solver0(I, f, c, L, n, dt, t)
  
      line.set_data(x,y)
  
      return line,
  
  
  
  anim = animation.FuncAnimation(fig, animate, init_func=init,
  
                                 frames=200, interval=20, blit=True)
  
  
  
  anim.save('seawave_1d_ani.mp4',writer='ffmpeg',fps=30)
  
  mpl.show()

  I believe the problem is in the part of the animation instead of the three functions above. Please help me find what mistake I have made.

• how to apostrophe with os.system in ffmpeg drawtext in python

  28 septembre 2023, par Ishu singh

  I just want to execute this code with os.system('command') in ffmpeg drawtext() but unable to execute it just because of ' (apostrophe) , it fails

  


  The code goes here ->

  


  the \f is working as \n but I'm using that for seprating word

  


  from PIL import ImageFont
import os

def create_lines(longline, start, end, fontsize=75, fontfile='OpenSansCondensedBold.ttf'):

    fit = fit_text(longline, 700, fontfile)

    texts = []
    now = 0
    # breaking line on basis of '\f'
    for wordIndex in range(len(fit)):
        if fit[wordIndex] == '\f' or wordIndex == len(fit)-1:
            texts.append(fit[now:wordIndex+1].strip('\f'))
            now = wordIndex

    # adding multiple lines to video
    string = ''
    count = 0
    for line in texts:
        string += f''',drawtext=fontfile={fontfile}:fontsize={fontsize}:text='{line[enter image description here](https://i.stack.imgur.com/iuceq.png)}':fontcolor=black:bordercolor=white:borderw=4:x=(w-text_w)/2:y=(h-text_h)/2-100+{count}:'enable=between(t,{start},{end})' '''
        count += 100

    print(string)
    return string

def createVideo(content):
    input_video = 'video.mp4'
    output_video = 'output.mp4'
    font_file = 'BebasKai.ttf'
    text_file = 'OpenSansCondensedBold.ttf'
    font_size = 75
    font_color = 'white'

    part1 = create_lines(content[1], 0.5, 7)
    part2 = create_lines(content[2], 7.5, 10)

    os.system(
        f"""ffmpeg -i {} -vf "drawtext=fontfile={font_file}:fontsize={95}:text={content[0]}:fontcolor={font_color}:box=1:boxcolor=black@0.9:boxborderw=20:x=(w-text_w)/2:y=(h-text_h)/4-100{str(part1)}{str(part2)}" -c:v libx264 -c:a aac -t 10 {output_video} -y""")

my_text =['The Brain', "Your brain can't multitask effectively", "Multitasking is a myth,  it's just rapid switching between tasks"]

createVideo(my_text)


  


  enter image description here

  


  what I want is that, I would able to execute this correctly