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• How to manage volume using FFMPEG

  13 mai 2015, par Somashekhar Ganjigatti

  Is there any way to set/modify/change/update volume of audio when it is playing using FFMPEG library.
  Thanks in advance.

• Converter tiff to yuv 4:0:0 in ffmpeg ?

  11 mars 2016, par Pedro Fernandes

  I have a tiff file created in matlab , with 16-bit , and I need to pass it to yuv format with 4 : 0 : 0 ( grayscale ) .

  How to do this in ffmpeg ?

  Or is there some other way to do so ?

  Thank you in advance

• Shall_exec() is not working in Cent OS 6.5 with php 5.5

  5 décembre 2014, par hitesh

  It is the follow up from the question here. I was not sure if it was good idea to edit that question, So I am asking a new question here

  As explained in my previous question I am using ffmpeg for getting screenshot from video.it seems to working fine in my local but in my Cent OS 6.5 server it is not working, it throws error that
  ffmpeg extension is not enabled.

  "Error in Loading ffmpeg"

  To debug this, I commented the line

    extension_loaded('ffmpeg') or die('Error in loading ffmpeg');

  and I found out that in Cent OS terminal, ffmpeg command were working but if I use it with full path as I am doing in windows it did not work.So i deleted full path and used ffmpeg alone, I am not sure what was the reason behind this.

  Here is my new command

    $cmd = "ffmpeg -i $vid -an -ss $getfromsecond -s $size -vframes 1 $imageFile";
  
      $cmd2 = "ffmpeg -i $remoteVideo -an -ss $getfromsecond -s $size -vframes 1 $imageFile2 ";
  
      echo $cmd ."<br />";
  
      echo $cmd2."<br />";
  
  exec($cmd, $output, $return);
  
  echo '$output :' ; print_r($output); echo "<br />";echo '$return' . $return . "<br />";
  
  
  
  if ($return != 0) {
  
      // an error occurred
  
      echo "Error in EXEC command ";
  
  }
  
  
  
  if(!shell_exec($cmd2)){
  
      echo "Remote video Thumbnail created". "<br />";
  
  }else{
  
      echo "Error Creating Remote video thumbnail". "<br />";
  
  }

  now again it was not working in server, but when I tried both command

   `     echo $cmd ."<br />";
  
  
  
          echo $cmd2."<br />";` 

  in dev terminal, it got executed successfully I could see the screenshot.

  So while searching for the problem, I found this question here based on this answer here. I understood that some server may not allow it so I checked it.

   if (isEnabled('shell_exec')) {
  
      echo "Shell_exec is enabled "."<br />";
  
      shell_exec('echo "hello world"');
  
      echo "<br />";
  
  }else{
  
  
  
      echo "shell exec command is not allowed";
  
  }

  I got the output "Shell_exec is enabled " but shell_exec('echo "hello world"'); does not seems to work, Also when I run the command directly in terminal it works.

  Help me find the issue here, is it issue with shall_exec() or something else ?

  Any help is appreciated. Thanks