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• Powershell : Start-Job a script, cannot connect to youtube

  16 mai 2016, par Kostas Georgokitsos

  I am a bit new to PS, so please bear with me. I have written a script that starts an ffmpeg proccess, and in an endless loop waits for the process, and restarts it as ffmpeg is a bit shaky. ffmpeg is taking an rtsp stream from a camera and forwards it to youtube.

  # initialization
  
  $buffer_size = "30720k" # 60 sec * 512kbps
  
  $ffm = "C:\Users\kostas\Downloads\_software\ffmpeg-20160308-git-5061579-win32-static\bin\ffmpeg.exe"
  
  $params = "-f lavfi -i aevalsrc=0  -thread_queue_size 512 -i rtsp://$($usr):$($pw)@$($cam_ip):554/mpeg-4/ch1/main//av_stream/ -f flv -vcodec copy -acodec aac -bufsize $($buffer_size) rtmp://a.rtmp.youtube.com/live2/$($youtube_key)"
  
  $params_bak = $params.Replace('/live2/','/live2/?backup=1/')
  
  # start stream(s)
  
  while (1 -eq 1) {
  
    $err_log = "C:\Users\kostas\Documents\logs\Stream_Error-$(Get-Date -Format dd-MM-yyyy_HH-mm-ss).log"
  
    $out_log = "C:\Users\kostas\Documents\logs\Stream-$(Get-Date -Format dd-MM-yyyy_HH-mm-ss).log"
  
    $strm_app = Start-Process $ffm $params -PassThru -WindowStyle Minimized -RedirectStandardError $err_log -RedirectStandardOutput $out_log
  
    Wait-Process $strm_app.Id
  
  } 

  When I call the script from the powershell prompt directly like .\youtube_cam_1.ps1 all is well, but the powershell prompt locks, obviously.

  When I start like Start-Job -FilePath C:\Users\kostas\Documents\youtube_cam_1.ps1 the job starts allright and I also see the ffmpeg process starting and running, but the youtube channel stays offline. Now to the funny bit : doing Stop-Job does not kill the ffmpeg process, and suddenly ffmpeg can connect to youtube.

  I want to start and run several camera streams (i.e. ffmpeg instances) in the end and need the looping script to somehow go into the background. Is Start-Job the wrong way to do it ?

  What is happening ?

• How to union RAW video data stream with RAW data audio stream through ffmpeg .net

  17 septembre 2022, par zabitstack

  I'm trying to union a raw video data stream with raw audio data stream but without success ! I capture video from webcam and audio from microphone in .net Accord Framework application.

  


  I want use ffmpeg core .net library to transform raw video data into a avi file, then same thing transform raw audio data into mp3 format file. Next merge mp3 with avi in single avi video+audio file.

  


  If you want, I can post source code how I capture data.

  


• Can only save animation in matplotlib with default parameters

  20 août 2019, par J.Doe

  I keep getting this error when trying to save my animations in matplotlib :

  import numpy as np
  
  import matplotlib.pyplot as plt
  
  from matplotlib.animation import FuncAnimation
  
  
  
  plt.rcParams['animation.ffmpeg_path'] = 'C:\FFmpeg\bin'
  
  
  
  fig, ax = plt.subplots()
  
  ax.set_xlim(-0.1 ,2*np.pi + 0.1)
  
  ax.set_ylim(-1.1 ,1.1)
  
  ln, = plt.plot([], [], '-')
  
  
  
  x = np.linspace(0,2*np.pi,1000)
  
  
  
  def update(frame):
  
  
  
      y = frame*np.sin(x)
  
      ln.set_data(x,y)
  
      return ln,
  
  
  
  ani = FuncAnimation(fig,
  
                      update,
  
                      frames=np.linspace(1,-1,1000),
  
                      interval=1000/144)
  
  
  
  ani.save('lol.gif')

  MovieWriter ffmpeg unavailable. Trying to use pillow instead.

  This is a repetition of an unanswered question : UserWarning : MovieWriter ffmpeg unavailable

  I tried running a sample code from here, but it still says ffmpeg isn’t available, even though I installed and activated it according to wikihow. So even setting the path to the binary doesn’t seem to work.

  I can’t set the fps or the dpi, or anything since the save function just defaults. What can I do so that python finally starts using ffmpeg ?