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• Sub-pixel rendering with imagettftext()

  8 mars 2016, par user1661677

  I’m creating an image sequence, and encoding it to a video using PHP, GD library and ffmpeg. You’ll see I’m animating the two text layers inversely of each other, on the X axis. And with some simple operators $i/2 and $i/3, I’m trying to make their movement slower in the final animation.

  The problem I’m having is that when the video is rendered out, each layer’s text is only moving ever second, and third frame, respectively. This causes the animation to be a bit ’jerky’ and just not as smooth as Adobe After Effects with it’s ability to support sub-pixel rendering of elements.

  Is there any way to get imagettftext(), or some other method of drawing on images to support sub-pixel rendering ?

  Thank you.

  for ($i = 1; $i <= 125; $i++) {
  
  
  
      // Text on Image
  
      $front = imagecreatefromjpeg('front.jpg');
  
      $white = imagecolorallocate($front, 255, 255, 255);
  
      $text = 'some text';
  
      $text2 = 'some other text';
  
      $font = '/var/www/html/test/OpenSans-Bold.ttf';
  
  
  
      // Add text
  
      imagettftext($front, 60, 0, 1340-($i/2), 720, $white, $font, $text);
  
      imagettftext($front, 35, 0, 1240+($i/3), 800, $white, $font, $text2);
  
  
  
      // Write image to file
  
      imagejpeg($front, "images/".$i.".jpg", 100);
  
  }

• My MKV to MP4 converted video doesn't play in flex

  24 mars 2015, par ketan

  I am stuck on one issue from last 1 day. I am using Adobe flex video display to play video for my site.

  There is some converted video from MKV to MP4 using ffmpeg.

  ffmpeg -i Test.mkv -vcodec copy -acodec copy Test.mp4

  Now, i am trying to play that video from local it’s working fine. But when i upload that video on server and trying to play video. Then it will not work with flex VideoDisplay same will work in browser and HTML videoplayer and also works with JWPlayer.

  Other mp4 video which are not converted works very fine. Only converted Videos are not working in only flex VideoDisplay.

  I am Just playing using.

  And give path to videoDisplay like :

  videoDisp.source = Video_path;

  My video file Video and Audio codec is as shown in below image :

  

  Any help will be appreciate,
  Thanks.

• How to add arbitrary or custom metadata in MP4 ?

  13 avril 2021, par 大大大大萝卜凉

  The MP4 muxer in ffmpeg only allows certain metadata by default. I would like to add :

  


  com.android.model: Mi 10 Pro
xyz: +22.9835+113.3621/
com.android.version: 1
com.android.manufacturer: Xiaomi


  


  How can I add this with ffmpeg ?