look for a specific filetype in a directory in php and send it to a different directory after conversion

Question

I have a directory in which there is a mp4 file (including other files as well) which I want to convert into mp3 and then send it to different directory. I have used the following command line command to covert into mp3 and its working perfectly fine.

ffmpeg -i 36031P.mp4 -map 0:2 -ac 1 floor_english.mp3 

mp4 file is inside in_folder. Using ffmpeg, I want to convert mp4 file into mp3 and send it to out_folder.

<?php
$dir    = 'in_folder';
$files1 = scandir($dir);
print_r($files1);    /* It lists all the files in a directory including mp4 file*/
?>

print_r($files1) lists all the file in a directory including mp4file.

Problem Statement:

I am wondering what php code I need to write so that it looks for only mp4 file inside the directory and send it to different directory (let say out_folder) after converting into mp3.

The pictorial representation of what I want:

Answer 1

In think it is what you want :

<?php
$dir    = 'in_folder';
$files1 = scandir($dir);
print_r($files1);    /* It lists all the files in a directory including mp4 file*/

$destination = 'your new destination';

foreach($files1 as $f)
{
  $parts = pathinfo($f);
  if ($parts['extension'] = 'mp3';
  {
    // copy($f, $destination. DS . $parts['filename']. '.' . $parts['extension']);
    rename($f, $destination. DS . $parts['filename']. '.mp3');
  }
}
?>

Documentation pathinfo

Edit with convertion :

I think you can directly export your mp3 like this

foreach($files1 as $f)
{
  $parts = pathinfo($f);
  if ($parts['extension'] = 'mp4';
  {
    // $result : the last line of the command output on success, and FALSE on failure. Optional.
    system('ffmpeg -i '.$f.' -map 0:2 -ac 1 '.$destination.DS. $parts['filename'].'.mp3', $result);
  }

  // See: https://www.php.net/manual/en/function.system.php
  if ($result === false) {
    // Do something if failed
    // log for example
  } else {
    // command completed with code : $result
    // 0 by convention for exit with success EXIT_SUCCESS
    // 1 by convention for exit with error EXIT_ERROR
    // https://stackoverflow.com/questions/12199216/how-to-tell-if-ffmpeg-errored-or-not
  }
}

Documentation system

or do a first loop too convert mp4, and a second loop to copy mp3

Edit all in one :

foreach($files1 as $f)
{
  $parts = pathinfo($f);

  switch(strtolower($parts['extension']))
  {
    case 'mp4' :
      // $result : the last line of the command output on success, and FALSE on failure. Optional.
      system('ffmpeg -i '.$f.' -map 0:2 -ac 1 '.$destination.DS. $parts['filename'].'.mp3', $result);

      // See: https://www.php.net/manual/en/function.system.php
      if ($result === false) {
        // Do something if failed
        // log for example
      } else {
        // command completed with code : $result
        // 0 by convention for exit with success EXIT_SUCCESS
        // 1 by convention for exit with error EXIT_ERROR
        // https://stackoverflow.com/questions/12199216/how-to-tell-if-ffmpeg-errored-or-not
      }
      break;

    case 'mp3' :
      // copy($f, $destination. DS . $parts['filename']. '.' . $parts['extension']);
      rename($f, $destination.DS.$parts['filename'].'.mp3');
      break;  
  }
}

Edit 1 : correction strtolower($parts['extension']) to check the extension of the file none case-sensitive.

or like this :

strtolower(pathinfo("/path/file.mP4", PATHINFO_EXTENSION)) == ".mp4"

There is no need to use preg_match and regexp because pathinfo is a pre-made function to do the job and it works fine unless you use double named extension like .tar.gz for example.

regular-expression-to-detect-a-file-extension

Edit 2 : Use rename instead of copy to move mp3.