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• PHP shell_exec wait for script to done ? [duplicate]

  6 mars 2016, par Melih Büyükbayram

  This question already has an answer here :

  • PHP shell_exec wait for script to finish ? [duplicate]
    
    1 answer
    

  I have a PHP script that queries a database for a list of jobs to be done and fires off other PHP scripts based on what it finds in the database (basically a process queue).

  Some of the scripts that the queue runner script executes may take 30 seconds or so to finish running (convert video, resizing images, etc).

  The problem is that shell_exec() in the queue runner script calls the processing scripts, but then doesn’t wait for them to finish, resulting in the queue not being completed.

  Queue runner script :

  #!/usr/bin/php
  
  <?php
  
      // Loop through database and find jobs to be done
  
      shell_exec("nohup $command > /dev/null 2> /dev/null & echo $! &");
  
  ?>

  Running the job script directly from the command line works and the PDF is created.

  Any ideas on how to fix this ? Or a better way to run a process queue ?

• ffmpeg Progress Bar - Encoding Percentage in PHP

  11 juillet 2016, par Jimbo

  I’ve written a whole system in PHP and bash on the server to convert and stream videos in HTML5 on my VPS. The conversion is done by ffmpeg in the background and the contents is output to block.txt.

  Having looked at the following posts :

  Can ffmpeg show a progress bar ?

  and

  ffmpeg video encoding progress bar

  amongst others, I can’t find a working example.

  I need to grab the currently encoded progress as a percentage.

  The first post I linked above gives :

  $log = @file_get_contents('block.txt');
  
  
  
  preg_match("/Duration:([^,]+)/", $log, $matches);
  
  list($hours,$minutes,$seconds,$mili) = split(":",$matches[1]);
  
  $seconds = (($hours * 3600) + ($minutes * 60) + $seconds);
  
  $seconds = round($seconds);
  
  
  
  $page = join("",file("$txt"));
  
  $kw = explode("time=", $page);
  
  $last = array_pop($kw);
  
  $values = explode(' ', $last);
  
  $curTime = round($values[0]);
  
  $percent_extracted = round((($curTime * 100)/($seconds)));
  
  
  
  echo $percent_extracted;

  The $percent_extracted variable echoes zero, and as maths is not my strong point, I really don’t know how to progress here.

  Here’s one line from the ffmpeg output from block.txt (if it’s helpful)

  time=00:19:25.16 bitrate= 823.0kbits/s frame=27963 fps= 7 q=0.0 size=
  117085kB time=00:19:25.33 bitrate= 823.1kbits/s frame=27967 fps= 7
  q=0.0 size= 117085kB time=00:19:25.49 bitrate= 823.0kbits/s
  frame=27971 fps= 7 q=0.0 size= 117126kB

  Please help me output this percentage, once done I can create my own progress bar. Thanks.

• ffmpeg usage corrupts pointer to filenames

  1er décembre 2014, par user296612

  Say I have 2 files in a folder named ’jack.aac’ and ’jill.aac’, and I run the following script ;

  ls -f -tr *.aac |
  
  while read i; do
  
  echo $i
  
  done

  • I get ’jack.aac’ and ’jill.aac’ printed as expected. If however I include ’ffmpeg -i "$i" -f ffmetadata metadata.txt’ in the while-loop, the second filename to be ’read’ ends up missing a character - ’ack.aac’ (instead of ’jack.aac’) for instance. ffmpeg-usage somehow seems to alter the pointer-to-filenames value. Can anyone tell me how to get around this ?