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• Batch convert gif files to image sequences using ffmpeg

  20 août 2021, par Alfred Cassels

  I've managed to convert a gif to image sequence using ffmpeg and this code :

  


  ffmpeg -i test/source.gif videos/image-%03d.png

  


  how can I batch convert my gifs and place them in subfolders ?

  


• Creating video from audio and resized image using FFMPEG

  20 décembre 2016, par nemeskeriors

  Im trying to create an mp4 video from an mp3 and an image with ffmpeg. The video should be the size of 640x360 with black background and the image should be resized to fit in this dimensions and centered in the middle. The video’s lenght must match the mp3’s length.

  Its basically a video creation for youtube from a song and an artwork.

  For now i was able to achive this with 3 steps :

  1. resize image :

  -i %image% -vf scale='if(gt(a,4/3),640,-1)':'if(gt(a,4/3),-1,360)' %resized_image%

  2. create a music video with black background :

  -f lavfi -i color=s=640x360 -i %audio_file% -c:v libx264 -s:v 640x360 -c:a aac -strict experimental -b:a 320k -shortest -pix_fmt yuv420p %video%

  3. put the resized image cenetered in the video :

  -i %video% -i %resized_image% -filter_complex "overlay=(W-w)/2:(H-h)/2" -codec:a copy %final_video%

  Is it possible to achive all this with one ffmpeg command ?

• Getting the picture Orientation from a ffmpeg frame slice (for background poster image)

  11 février 2018, par wuzz

  Been at this for hours now, can’t seem to find a way to get the orientation. No matter what I do the image frame slice is sideways. Idea’s Interweb friends ? Also, I am doing this with MP4 and I already know the next issue I am going to run into is doing this with MOV files, from iOS uploads. Any help there, would be appreciated as well thanks.

  $command_to_execute = "ffmpeg -vframes 1 -ss 1/2 -i " . $video_path . " " . 
  
  $video_image_dir . $video_name . ".jpg -y";
  
  exec($command_to_execute);
  
  $exif = exif_read_data($video_image_dir . $video_name . ".jpg");
  
  $imageResource = imagecreatefromjpeg($video_image_dir . $video_name.".jpg");
  
    switch ($exif['Orientation']) {
  
      case 3:
  
              $image = imagerotate($imageResource, 180, 0);
  
      break;
  
      case 6:
  
              $image = imagerotate($imageResource, -90, 0);
  
      break;
  
      case 8:
  
              $image = imagerotate($imageResource, 90, 0);
  
      break;
  
      default:
  
              $image = $imageResource;
  
      }
  
      imagejpeg($image, "upload/" . $video_name . ".jpg", 90);