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• 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 ?

• Reverse video using many commands in a script

  19 août 2021, par Sam

  I am trying to make a script with FFmpeg using Reverse mode, i am not able to make it work correctly, unfortunately is some weeks i am using Linux and FFmpeg, my intention is ;

  


  

  • put the original video in Reverse directory

  


  • start the script
the script make this job ;

  


  • create the directory mkdir 01-Elaborazione

  


  • FFMPEG separate the video in small clips of 5 sec and put in 01-Elaborazione
after that

  


  • create the directory mkdir 01

  


  • FFMPEG make the Reverse of the clips and put in the directory 01

  


  • create a list Originale.txt of the Reversed clips in directory 01

  


  • change the list Inversa to invert the lines (so that the FFmpeg is making the concat correctly)

  


  • FFMPEG concat all the Reversed clips using the list Inversa.txt and put the output Pronto.mp4 in the directory Reverse
after that

  


  • delete the directory 01- Elaborazione with all the files

  


  


  at the end i have to put also many done before it start, but also doing this is not doing the job i want

  


  i have to make this, because this way i do not have problem with the Ram and Swap

  


  the script is this ;

  


  # !/bin/bash

  


  cd /srv/dev-sataa24/Lavori/Z-Modifiche/Reverse

  


  mkdir 01-Elaborazione

  


  for i in *.mp4 ; do ffmpeg -i "$i" -f segment -segment_time 5 -c copy -reset_timestamps 1 01-Elaborazione/sample_%03d.mp4 -hide_banner && rm "$i"

  


  done

  


  for i in *.MP4 ; do ffmpeg -i "$i" -f segment -segment_time 5 -c copy -reset_timestamps 1 01-Elaborazione/sample_%03d.mp4 -hide_banner && rm "$i"

  


  Wait for the processes to finish

  


  wait

  


  done && cd

  


  cd /srv/dev-sataa24/Lavori/Z-Modifiche/Reverse/01-Elaborazione

  


  mkdir 01

  


  for i in .MP4 ; do ffmpeg -i "$i" -threads 1 -vf reverse -af areverse 01/"$i%..mp4"

  


  cd /srv/dev-sataa24/Lavori/Z-Modifiche/Reverse/01-Elaborazione

  


  for i in .mp4 ; do ffmpeg -i "$i" -threads 1 -vf reverse -af areverse 01/"$i%..mp4"

  


  Wait for the processes to finish

  


  wait

  


  done && cd

  


  cd /srv/dev-sataa24/Lavori/Z-Modifiche/Reverse/01-Elaborazione/01

  


  for f in *.mp4 ; do echo file '$f' >> originale.txt

  


  tac originale.txt > inversa.txt

  


  ffmpeg -f concat -safe 0 -i inversa.txt -c copy /srv/dev-sataa24/Lavori/Z-Modifiche/Reverse/Pronto.mp4

  


  Wait for the processes to finish

  


  wait

  


  cd /srv/dev-sataa24/Lavori/Z-Modifiche/Reverse

  


  rm -r 01-Elaborazione/

  


  cd

  


  done
done

  


• doc : add script to compute texi files dependencies

  28 mai 2013, par Stefano Sabatini

  doc : add script to compute texi files dependencies
  Replace the inline awk script with a Perl script which tracks the
  
  dependencies recursively.
  This allows to correctly track dependencies for files including files
  
  with a second level include (for example : ffmpeg-devices.texi ->
  
  devices.texi -> outdevs.texi).
  This also adds a dependency on perl for computing the dependencies, which
  
  should not be a problem since perl is already required all the way for
  
  building documentation.
  

  • [DH] configure
  • [DH] doc/Makefile
  • [DH] doc/texidep.pl