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• How to compare audio channel differences with FFmpeg ?

  30 septembre 2021, par Deivedux

  I'm making a little script for myself to quickly go through a large volume of video and audio files to compress audio for extra space, but for extra efficiency, I also don't want to waste space by keeping both channels if they're identical.

  


  My issue is that I don't know how to, let's say, check if their decoded versions are at least a 99.99% match, in which case I'd only encode the left channel into mono.

  


  How would I go about doing this ?

  


• copy processed mp3 files from one directory to another directory in php

  17 mai 2019, par flash

  I am working on a php code as shown below which is converting mp4 files into mp3 using ffmpeg. After conversion, everything goes into outgoing_folder.

  <?php
  
  const DS = '/';
  
  $src_dir    = 'incoming_folder';   /* Place where mp4 file is present */
  
  
  
  $destination = 'outgoing_folder';  /* Place where mp3 files come after conversion from mp4 */
  
  
  
  $mp3_processed = 'podcast_mp3_processed'; /* Place where I also want mp3 files */
  
  
  
  foreach ($mp4_files as $f)
  
  {
  
  
  
      $parts = pathinfo($f);
  
      switch ($parts['extension'])
  
      {
  
          case 'mp4' :
  
              $filePath = $src_dir . DS . $f;
  
              system('ffmpeg -i ' . $filePath . ' -map 0:2 -ac 1 ' . $destination . DS . $parts['filename'] . '.mp3', $result);    /** Place where mp3 file goes after conversion from mp4 **/
  
  
  
              if ($result)
  
              {
  
                  // Do something with result if you want
  
                  // log for example
  
              }
  
              break;
  
  
  
          case 'mp3' :
  
              // copy($f, $destination. DS . $parts['filename']. '.' . $parts['extension']);
  
              copy($f, $destination . DS . $parts['filename'] . '.mp3');
  
              copy('outgoing_folder', 'podcast_mp3_processed');               /* Line #A */
  
              break;
  
      }
  
  }
  
  ?>

  Problem Statement :

  I am wondering what changes I need to make in the php code above so that when all mp4 files have been converted to mp3 then it should also go to podcast_mp3_processed folder.

  At this moment it is going outgoing_folder but I also want it to go to podcast_mp3_processed folder. I tried with the code at Line#A but it doesn’t seem to work.

• Automatically assign a name to a file being saved

  13 janvier 2017, par J.D Alford

  I"m using ffmpeg to create video clips. I want to automate the process and save the clips without manually giving names to each file being saved. Here is the code I have. It will create and save the clip but only with an extension and not a name.

  @echo off
  cd /d % dp0

  set /p place="Enter location : " %=%

  set /p time="Enter time : " %=%

  for /F %%a in (’dir /b *.mp4’) do set FileName=%% na

  ffmpeg -i "%place%" -ss %time% -codec copy -t 10 %FileName%.mp4

  I’m sure there’s a simple solution but I can’t figure it out. Any help would be appreciated