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• How to run multiple instances of VLC from command line

  5 janvier 2014, par Andy

  I have a vlc line that streams and transcodes a channel from tvheadend. Usually multiple streams are handled through VLM but for some reason VLM doesnt like tvheadend playlists. If I do this through command line it seems to be working fine

  The command is ./vlc + some options

  When you execute the command it returns a lot of output messages and you can not enter any other commands. I have successfully launched another line in a new putty session.

  Is there a way to run this as batch to execute multiple VLC commands as if they were coming from different SSH sessions ?
  Perhaps ffmpeg handles tvheadend playlists better ?

• PHP script works when called from command line, does not when called as background via web server

  6 juin 2014, par fNek

  I am facing a problem with a certain PHP script (CLI mode) I wrote. It should take certain arguments to convert a video with FFMPEG. When I call it from the command prompt, it works fine. However, I have to call it from a web server.

  The PHP script that handles the request calls the PHP script in the background via code I found here at SE :

  if (substr(php_uname(), 0, 7) == "Windows"){ 
  
      pclose(popen("start /B ". $cmd, "r"));  
  
  } 
  
  else { 
  
      exec("nohup " . $cmd . " > /dev/null &");
  
  }

  When run this way, however, the PHP script does not create the files, even after a much longer time than it took via the command prompt.

  The script runs, I have checked that by letting it insert dummy entries into the database. It also has the permission to create files, which I verified by letting it create a text file.

  What could be the difference that prevents my script from working properly ? I develop and test this code with XAMPP on Windows 7.

  //EDIT : I forgot to give you this link to the background PHP script : http://pastebin.com/pfTZMfwi

  //EDIT2 : I found out that the PHP process runs for a very short time (only until next refresh of the Windows task manager). Could it be that PHP kills its children when it exits ?

  //EDIT3 : No, that seems not to be the problem. I cannot execute programs via exec() when the script is called as background from the web server. What could the problem be, and what would be a solution/workaround ?

  //EDIT4 : The command that seems to cause the trouble is not exec()/etc. but the echo command I did before the exec(). I am going to remove it, but why does it cause a problem ?

• video File conversion from any fromat to webm in windows using ffmpeg command line

  23 janvier 2014, par user3217695

  As i need to convert the video from any format which is uploaded to WEBM, since i am using video tag to play videos in browsers the code which i am using works fine for mp4 conversion but it doesn't for the WEBM format file. so please find me a solution

  ffmpeg -i INPUT_FILE -y -ar 22050 -ab 512 -b 800k -f webm -s 514*362 OUTPUT_FILE.WEBM

  Thanks.