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• Can FFmpeg perform audio phase subtraction ? [closed]

  22 avril 2023, par Calarpo

  I can do audio phase subtraction in Adobe Audition like so : https://www.youtube.com/watch?v=vNvJKBg3yds

  


  How can I do this with FFmpeg ? Is it possible ?

  


  I've googled for audio phase subtraction, and looked at https://ffmpeg.org/ffmpeg-filters.html, nothing seems to work for me.

  


  I want to do phase subtraction in batches and support for stereo audio.

  


• Can't obtain thumbnail with ffmpeg codeigniter

  2 avril 2015, par DMBorges

  I have used the following tutorial ( https://www.youtube.com/watch?v=qT4hN5o57hI) to try to obtain a thumbnail from a uploaded video using codeigniter as a framework. As I am new to all this I don’t understand if at the end of supposedly uploading my video the code failed to create a thumbnail, if my created thumbnail is somewhere lost in my computer of by some settings reasons ffmpeg is not working.

  Where does my $imageFile goes to ?

  Here is my code.

  MY VIEW

  <div>
  
  
  
              &lt;?php echo form_open_multipart('gallery/save/'); ?>
  
                  <table class="table">
  
                      <tr>
  
                          <td>Video</td>
  
                          <td>&lt;?php echo form_upload('pic'); ?></td>
  
                      </tr>
  
                      <tr>
  
                          <td>Descrição</td>
  
                          <td>&lt;?php echo form_input('description'); ?></td>
  
                      </tr>
  
                      <tr>
  
                          <td></td>
  
                          <td>&lt;?php echo form_submit('upload', 'Guardar', 'class="btn btn-primary"'); ?></td>
  
                      </tr>       
  
                  </table>
  
  
  
      </div>

  MY CONTROLLER

  <?php
  
  class Gallery extends CI_Controller{
  
      public function index(){
  
          //Load View
  
          $data['main_content'] = 'gallery';
  
          $this->load->view('layouts/main', $data);
  
      }
  
  
  
      public function save()
  
      {
  
          $url = $this->do_upload();
  
          $ffmpeg = "C:\\xampp\\htdocs\\ffmpeg\\bin";
  
          $videoFile = $_FILES["pic"]["tmp_name"];
  
          $imageFile = "1.jpg";
  
          $size = "120x90";
  
          $getFromSecond = 5;
  
          $cmd = "$ffmpeg -i $videoFile -an -ss $getFromSecond -s $size $imageFile "; 
  
          echo $cmd;
  
          if(!shell_exec($cmd)){
  
              echo 'thumbnail created!'; 
  
          }
  
          else {
  
              echo 'ERROR!';
  
          }
  
  
  
          /* $config = array(
  
                          'source_image' => $url,
  
                          'new_image' =>"./assets/images/gallery/thumbs/",
  
                          'maintain_ration' => true,
  
                          'width' => 150,
  
                          'height'=> 100
  
                          );
  
                  $this -> load -> library('image_lib', $config);
  
                  $this ->image_lib-> resize();
  
                  $description = $_POST["description"];
  
                  $user = $this->session->userdata('user_id');
  
                  $this->Gallery_model->save($description, $url, $user);
  
                  redirect('gallery'); */
  
      }
  
      private function do_upload()
  
      {
  
          $type = explode('.', $_FILES["pic"]["name"]);
  
          $type = strtolower($type[count($type)-1]);
  
          $id = uniqid(rand());
  
          $url = "./assets/images/gallery/".$id.'.'.$type;
  
          if(in_array($type, array("wmv", "mp4", "avi", "flv")))
  
              if(is_uploaded_file($_FILES["pic"]["tmp_name"]))
  
                  if(move_uploaded_file($_FILES["pic"]["tmp_name"],$url))
  
                      return $url;
  
          return "";
  
      }
  
  }

• FFMPEG reports different (wrong) video resolution compared to how it actually plays

  30 mars 2015, par Emiliano

  Quick question, i have a movie, which was cut and rendered with Sony Vegas from its original format to a .wmv file. Here comes the tricky part, movie when played, either with VLC or WMP, has a resolution of 656x480 ... BUT when i run a ffmpeg -i on it, it says it has a resolution of 600x480 ....

  I took the time of actually capturing a frame and croping it with photoshop and its 656 and not 600 like ffmpeg its reporting, why would this could be happening ? How could i fix the headers resolution ? Would that have any impact on video re-rendering ? As i said, VLC and WMP seems not to care about the incorrect headers and are playing it right, BUT, jwplayer seems to be using the header information, which i don’t blame him, its correct to do that, but why the video headers could be wrong ?

  ffmpeg -i trailer.wmv

  Input #0, asf, from ’trailer.wmv’ :
  Duration : 00:01:04.93, start : 3.000000, bitrate : 2144 kb/s
  Stream #0.0 : Audio : wmav2, 44100 Hz, mono, 32 kb/s
  Stream #0.1 : Video : wmv3, yuv420p, 600x480 [PAR 59:54 DAR 295:216], 2065 kb/
  s, 25.00 tb(r)

  And yeah, the PAR/DAR parameters are also wrong, but honestly, i don’t understand that technical shit, usually watch video and make sure it look good, any feedback would be appreciated :P

  Is there a way to change the container information with ffmpeg so applications that actually do use the container information don’t render video incorrectly ?