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• Concatenating two videos with ffmpeg

  9 mars 2019, par Lance

  I have a two videos. One that will be downloaded with youtube-dl and one that is made out of an image with ffmpeg and the loop function.

  public function createTimePic($id, $image_width, $image_height, $text) {
  
      $font_size = 20;
  
      $angle = 0;
  
      $font = 'public/fonts/arial.ttf';
  
      $im = imagecreatetruecolor($image_width, $image_height);
  
      $white = imagecolorallocate($im, 255, 255, 255);
  
      $grey = imagecolorallocate($im, 128, 128, 128);
  
      $black = imagecolorallocate($im, 0, 0, 0);
  
      imagefilledrectangle($im, 0, 0, $image_width, $image_height, $black);
  
  
  
      $text_box = imagettfbbox($font_size, $angle, $font, $text);
  
      $text_width = $text_box[2]-$text_box[0];
  
      $text_height = $text_box[7]-$text_box[1];
  
      $x = ($image_width/2) - ($text_width/2);
  
      $y = ($image_height/2) - ($text_height/2);
  
  
  
      imagettftext($im, $font_size, 0, $x, $y+1, $grey, $font, $text);
  
      imagettftext($im, $font_size, 0, $x, $y, $white, $font, $text);
  
  
  
      $file = $this->videoPath.'time_difference_'.$id.'.jpg';
  
      imagejpeg($im, $file);
  
  
  
      $video = 'time_difference_'.$id.'.mp4';
  
      if (!file_exists($this->videoPath.$video)) {
  
          $this->createVideoFromImg($file, $video);
  
      }
  
  
  
      return [
  
          'img' => $file,
  
          'video' => $video
  
      ];
  
  }
  
  
  
  public function createVideoFromImg($img, $video) {
  
      $command = './ffmpeg -loop 1 -i '.$img.' -t 5 -c:v libx264 -preset slow -crf 18 -c:a copy -pix_fmt yuv420p '.$this->videoPath.$video;
  
      exec($command, $output);
  
  }
  
  
  
  public function downloadYouTubeVideo($video_id, $audio_only = false) {
  
      $file_type = $audio_only ? 'mp3' : 'mp4';
  
      $file = $this->videoPath.$video_id.'.'.$file_type;
  
  
  
      if (!file_exists($file)) {
  
          $command = '/usr/local/bin/youtube-dl -o "'.$file.'" ';
  
          if ($audio_only) {
  
              $command .= '--extract-audio --audio-format '.$file_type.' ';
  
          }
  
  
  
          $command .= ' https://www.youtube.com/watch\?v\='.$video_id;
  
          exec($command, $output);
  
  
  
          $command = './ffmpeg -i '.$file.' -c:v libx264 -preset slow -crf 18 -c:a copy -pix_fmt yuv420p '.str_replace('.mp4', '', $file).'_encoded.mp4';
  
      }
  
  
  
      return $file;
  
  }
  
  
  
  $command = './ffmpeg -f concat -safe 0 -i list.txt -c copy '.$this->videoPath.$id.'_new1.mp4';
  
  exec($command, $output);

  Inside of my list.txt file are the paths to the two videos, one that was created from a jpeg and one that was downloaded from youtube. Running the command at the bottom creates a new video. It’s just that the it’s the same exact thing as the youtube video. The other image never gets added. Could this have to do with the encoding ?

• How to create a circular countdown indicator overlayed into a video with ffmpeg ?

  18 novembre 2020, par Ben Holness

  I have a script that creates a video from multiple sources. At the start of the video there is a 5 second long pause where some information is displayed.

  


  I want to give a visual indicator of how long it is until the main video starts, with a circle in the top left corner. The circle would start completely transparent and slowly fill in grey round the circle as the video progresses. At 25% of the video, the top right quarter of the circle would be gray. At 50% the right half of the circle would be gray and so on.

  


  I am imagining something similar to this solution which is a progress bar, but I'm not sure if it's possible/how to make it a circular one.

  


• Can I create a circular countdown indicator overlayed into a video with ffmpeg ?

  9 novembre 2020, par Ben Holness

  I have a script that creates a video from multiple sources. At the start of the video there is a 5 second long pause where some information is displayed.

  


  I want to give a visual indicator of how long it is until the main video starts, with a circle in the top left corner. The circle would start completely transparent and slowly fill in grey round the circle as the video progresses. At 25% of the video, the top right quarter of the circle would be gray. At 50% the right half of the circle would be gray and so on.

  


  I am imagining something similar to this solution which is a progress bar, but I'm not sure if it's possible/how to make it a circular one.

  


  Thanks !