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• FFMPEG: How to not loose quality when increasing the volume of MP3 file?

  1 August 2021, by user7858768

  When increasing the volume of MP3 file (re-encoding the file to have higher volume) using the following command:

  


  ffmpeg -y -i /tmp/input.mp3 -af volume=2 -ab 48k /tmp/output.mp3


  


  When volume increase (volume=2) is below 2 (below 200%) the audio quality sounds clean. However, when the audio is increased past 2, example: volume=3 there are distortions that can be heard.

  


  The bitrate of the original file is 48k (hence I am setting it to 48k otherwise ffmpeg drops output bitrate to 32k)

  


  Are there any settings that can be set to avoid distortions from appearing when adjusted volume is at rate of 3 and above?

  


• How to upload dynamically generated video thumbnails as a BLOB into MySQL database in PHP

  26 October 2018, by Parthapratim Neog

  Here is the code that has been used to create a thumbnail of a uploaded video. The thumbnail is automatically generated successfully, but now, I want to store that thumbnail as a BLOB in the Database.
  I know how to upload an image as a BLOB using form posts, but there is no form posts involved in this.

  Could someone guide me through this?

   
  
  
  
  
  
   <form action="index.php" method="POST" enctype="multipart/form-data">
  
    <input type="file" />
  
    <input type="submit" value="Upload" />
  
   </form>
  
   &lt;?php
  
   if(isset($_POST['submit'])){
  
    /*
  
    -i input file name
  
    -an Disabled audio
  
    -ss Get image from x seconds in the video
  
    -s  size of the image
  
    */
  
    //Get one thumbnail from the video
  
    $ffmpeg = "C:\\ffmpeg\\bin\\ffmpeg";
  
    //echo $ffmpeg;
  
    $videoFile = $_FILES["file"]["tmp_name"];
  
    $imageFile = "1.jpg";
  
    $size = "120x90";
  
    $getFromSecond = 5;
  
  
  
    //echo "<pre>"; print_r($_FILES); die;
  
    //echo "video location: ",$videoFile,"<br />";
  
    echo $cmd = "$ffmpeg -i $videoFile -an -ss $getFromSecond -s $size $imageFile";
  
  
  
    echo "<br />";
  
    if(!shell_exec($cmd)){
  
     echo "Thumbnail Created!";
  
    }else{
  
     echo "Error creating Thumbnail";
  
    }
  
  
  
    /*// Get multiple thumbnails from one video
  
    $ffmpeg = "C:\\ffmpeg\\bin\\ffmpeg";
  
    $videoFile = $_FILES["file"]["tmp_name"];
  
    $size = "120x90";
  
    for($num =1; $num&lt;=3; $num++){
  
     $interval = $num * 3;
  
     shell_exec("$ffmpeg -i $videoFile -an -ss $interval -s $size $num.jpg");
  
     echo "Thumbnail Created!- $num.jpg<br />";
  
    }
  
    echo "<br />$num thumbnails Created!";
  
    */
  
   } 
  
   ?>
  
  
  
  
  
  </pre>

• How to upload dynamically generated video thumbnails as a BLOB into MySQL database in PHP

  26 November 2015, by Parthapratim Neog

  Here is the code that has been used to create a thumbnail of a uploaded video. The thumbnail is automatically generated successfully, but now, I want to store that thumbnail as a BLOB in the Database.
  I know how to upload an image as a BLOB using form posts, but there is no form posts involved in this.

  Could someone guide me through this?

   
  
  
  
  
  
   <form action="index.php" method="POST" enctype="multipart/form-data">
  
    <input type="file" />
  
    <input type="submit" value="Upload" />
  
   </form>
  
   &lt;?php
  
   if(isset($_POST['submit'])){
  
    /*
  
    -i input file name
  
    -an Disabled audio
  
    -ss Get image from x seconds in the video
  
    -s  size of the image
  
    */
  
    //Get one thumbnail from the video
  
    $ffmpeg = "C:\\ffmpeg\\bin\\ffmpeg";
  
    //echo $ffmpeg;
  
    $videoFile = $_FILES["file"]["tmp_name"];
  
    $imageFile = "1.jpg";
  
    $size = "120x90";
  
    $getFromSecond = 5;
  
  
  
    //echo "<pre>"; print_r($_FILES); die;
  
    //echo "video location: ",$videoFile,"<br />";
  
    echo $cmd = "$ffmpeg -i $videoFile -an -ss $getFromSecond -s $size $imageFile";
  
  
  
    echo "<br />";
  
    if(!shell_exec($cmd)){
  
     echo "Thumbnail Created!";
  
    }else{
  
     echo "Error creating Thumbnail";
  
    }
  
  
  
    /*// Get multiple thumbnails from one video
  
    $ffmpeg = "C:\\ffmpeg\\bin\\ffmpeg";
  
    $videoFile = $_FILES["file"]["tmp_name"];
  
    $size = "120x90";
  
    for($num =1; $num&lt;=3; $num++){
  
     $interval = $num * 3;
  
     shell_exec("$ffmpeg -i $videoFile -an -ss $interval -s $size $num.jpg");
  
     echo "Thumbnail Created!- $num.jpg<br />";
  
    }
  
    echo "<br />$num thumbnails Created!";
  
    */
  
   } 
  
   ?>
  
  
  
  
  
  </pre>