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

  16 May 2016, by 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 simplify the script for ffmpeg?

  27 March 2018, by Pravesh Kumar

  I want this script to be simplified

  I am having this given simple script; I would like to simplify this script can anyone help me to add text with the proper time interval and fade in and out effect.

  ffmpeg -y -i video.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='Which of these is not an event listener adapter defined in the java.awt.event package?': fontcolor=white: fontsize=40: x=100:y=200, \
  
  format=yuva444p,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out.mp4
  
  
  
  ffmpeg -y -i test_out.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='a) public void apple(String s, int i) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 2, \
  
  format=yuva444p,fade=t=in:st=3:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out1.mp4
  
  
  
  ffmpeg -y -i test_out1.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='b) public int apple(int i, String s) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 3, \
  
  format=yuva444p,fade=t=in:st=4:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out2.mp4
  
  
  
  ffmpeg -y -i test_out2.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='c) public void apple(int i, String mystring) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 4, \
  
  format=yuva444p,fade=t=in:st=5:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out3.mp4
  
  
  
  ffmpeg -y -i test_out3.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='d) public void Apple(int i, String s) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 5, \
  
  format=yuva444p,fade=t=in:st=6:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out4.mp4

• execute shell script from php

  11 July 2016, by Shorty

  when i use a ffmpeg command in shell_exec it works, but when i want to execute the shellscript with a given value it doesn’t ...

   $cmd='ffmpeg -i /home/shorty/stormfall/'.$upld.' -filter_complex "[0:v]boxblur=10[bg];[0:v]crop=1280:625:00:45[fg];[bg][fg]overlay=00:45" -c:v libx264  -c:a copy /home/shorty/stormfall/swf/temp.flv';

  works but;

   $cmd="./home/shorty/stormfall/members/moviefilters.sh /home/shorty/stormfall/$upld";

  not,

  i use

  file=$1
  
  ffmpeg -i $1 -filter_complex "[0:v]boxblur=10[bg];[0:v]crop=1280:625:00:45[fg];[bg][fg]overlay=00:45" -c:v libx264  -c:a copy /home/shorty/stormfall/swf/temp.flv

  in script to get the value

  any ideas to fix?