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• ffmpeg image + audio to video, file size is very large ?

  10 juin 2019, par Hoopes

  I have a single image and a single audio file, and I’m trying to combine them into a video. The image is 186k and the audio is 242k, and the resulting mp4 file is 928k. Is this just one of those "Yeah, that’s how that works", or can I do something to make the resulting video file smaller with my ffmpeg command ? I’d like my output to be h264 video, and the audio to have the same quality as the input. The image in the video should ideally be as high quality as the input.

  My command is :

  ffmpeg -loop 1 -i image.jpg -i audio.mp3 -c:v libx264 -tune stillimage -c:a mp3 -b:a 192k -pix_fmt yuv420p -shortest result.mp4

  Are there any interesting flags I’m missing, or using any of those flags incorrectly ? If the input file is m4a, do I still need to use mp3 for an mp4 file ?

  Any help is very much appreciated, thanks !

• Disable image file name correction by default. Closes #3332

  2 septembre 2014, par blueimp

  Disable image file name correction by default. Closes #3332
  To enable image file correction, the option `correct_image_extensions`
  
  can be set to `true`.
  
  This applies the exif_imagetype function on all files if available and
  
  corrects the file extension if it doesn’t match.
  

• Image pipe from php to ffmpeg

  30 avril 2013, par Angus

  I'm tring to feed FFMpeg whith an image sequence through PHP in order to get a video out of it. I'm using this shell command to read from a text file the image filenames :

  cat $(cat " . $image-list-file . ") | ffmpeg -f image2pipe ...

  I would like to output to the pipe prom php, maybe after modifying the images through imagemagik or gd.

  How can I do this in PHP ?

  Edit :

  SOLUTION

  Using a combination of proc_open and buffer did the job.
  Here's a working test script using some GD generated pictures.

  <?php
  
  set_time_limit(0);
  
  $descriptors = array(
  
      0 => array("pipe", "r")
  
  );
  
  
  
  $command = "ffmpeg -f image2pipe -pix_fmt rgb24 -r 30 -c:v png -i - ".
  
                  "-r 30 -vcodec libx264 -pix_fmt yuv420p ".
  
                  "-y test.mp4";
  
  
  
  $ffmpeg = proc_open($command, $descriptors, $pipes);
  
  
  
  if (is_resource($ffmpeg)){
  
      for ($i = 0; $i < 180; $i++) {
  
          $im = @imagecreate(300, 300) or die("GD error");
  
          $background_color = imagecolorallocate($im, 0, 0, 0);
  
          $line_color = imagecolorallocate($im, 233, 14, 91);
  
          $x = rand(0, 300);
  
          imageline ($im, $x, 0, $x, 300, $line_color);
  
          ob_start();
  
          imagepng($im);
  
          fwrite($pipes[0], ob_get_clean());
  
          imagedestroy($im);
  
      }
  
      fclose($pipes[0]);
  
  }