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• How To Adjust Volume in An Audio Mix With Node Fluent-FFmpeg

  8 octobre 2015, par Alexander Perls

  I am using the node Fluent-FFmpeg library to mix together two audio files.

  My current code :

      var ffmpeg = require('fluent-ffmpeg');
  
      ffmpeg("/audioFileOne.wav")
  
              .input("/audioFileTwo.wav")
  
              .complexFilter('amix=duration=first')
  
              .audioFrequency(44100)
  
              .audioCodec('libmp3lame')
  
              .audioQuality(5)
  
              .output("/mixedFile.wav").run();
  
      }

  This works well. However, try as I might, I can’t figure out how to change the volume level of audioFileOne.wav before it is mixed with audioFileTwo.wav

  I am pretty sure I need to add something to this line

  .complexFilter('amix=duration=first')

  But I seem to be not smart enough to understand the ComplexFilter documentation on this page.

  If necessary I can provide some of the code that I have tried, but I don’t want to create more confusion.

• 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

• How to do text alignment on box in ffmpeg ?

  28 juin 2022, par Dinesh Reddy

  Drawbox with drawtext

  


  ffmpeg -y -i skate.mp4 -filter_complex "drawbox=x=645.7538994800693:y=449.2201039861352:w=700:h=169:color=red@1:t=fill,drawtext=enable='between(t,0,3)':fontfile='344c235b-9bf7-4b13-ad99-ab230b473577.ttf':text='Hello world':fontsize=150:line_spacing=3:x=645.7538994800693:y=449.2201039861352:fontcolor=#000000:borderw=0:bordercolor=#ffffff,rotate=a=0*PI/180:ow=rotw(0*PI/180):oh=roth(0*PI/180):c=black@0"  output.mp4

  


  I draw the box using drawbox filter and written the text also but i need to do text alignment in the box like center, right and left. Can you help in this anyone.

  


  Thanks in advance