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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 ?

• I can no longer convert an mp4 video that is downloaded from YouTube to .wav file using ffmpeg [closed]

  25 juillet 2024, par user3288051

  I can no longer convert an mp4 video that is downloaded from YouTube to .wav file using ffmpeg.

  


  Here is the command I am using :

  


  video_name = "my_video_file"
dir_name = "experiment/john_doe/"

command = f'ffmpeg -i {dir_name}{video_name}.mp4 -ab 160k -ar 44100 -vn {dir_name}{video_name}.wav'

try:
    subprocess.check_call(command, shell=True)
except Exception as ex:
    print("Error: " + str(ex))


  


  Unfortunately, I get the following error :

  


  


  Output #0, wav, to 'experiment/john_doe/my_video_file.wav' : [out#0/wav
@ 0x1526131c0] Output file does not contain any stream Error opening
output file experiment/john_doe/James_Murphy2.wav. Error opening
output files : Invalid argument Error : Command 'ffmpeg -i
experiment/john_doe/my_video_file.mp4 -ab 192k -ac 2
experiment/john_doe/my_video_file.wav' returned non-zero exit status
234.

  


  


  Did YouTube change its codec ?

  


  Here is my video file in case you would like to give it a try. I downloaded it from my own YouTube channel (my own video).

  


  I would appreciate your help.

  


• FFMPEG Subtitle Burning - Make Them Look Like Youtube Captions

  21 septembre 2016, par Spencer

  I want to burn subtitles into videos and make them look as close to the YouTube captions as possible. I’ve gotten pretty close with the following :

  ffmpeg -i VIDEOFILE.mkv -vf subtitles="f=SUBSFILE.vtt:force_style='FontName=Arial,FontSize=14,OutlineColour=&H55000000,BorderStyle=3,WrapStyle=2'" -y ENCODED-WITH-SUBS.mp4

  1. The major thing I want to fix in the above command is that when there are multiple lines, the backgrounds overlap.

  

  If you look at captions on YouTube there is always a nice small amount of space between the backgrounds.

  

  2. The second thing I’d like to do is make the corners of the backgrounds rounded if possible.

  I’ve looked through the documentation but I’m hoping I missed something. Thanks for any suggestions !