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• Auto frame rate ffmpeg when passing frame with pipe

  16 mai 2017, par Elheni Mokhles

  I am using phantom js to render screenshots of the page and then passing it to FFmpeg to create a video, is it possible to make FFmpeg auto calculate the framerate using the duration between frames ?

  phantomjs file.js | ffmpeg -y -c:v png -f image2pipe -r 30 -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart outp.mp4

  I tried to make phantomjs send frame every 1/30 seconds but because it’s in a setIntervale it doesn’t work like expected.

• 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]);
  
  }

• Raspberry Pi : Playing multiple video files in mkfifo pipe

  19 janvier 2017, par user3246167

  I have 2 files, test.mp4 and test2.mp4 that I want to play concurrently with no noticeable break in the middle. Currently I’m using

  mkfifo test
  
  cat test.mp4 > test &
  
  cat test2.mp4 > test &
  
  omxplayer test

  However, when I do this, omxplayer just returns data and doesn’t play the file. But if I just put a single file into the pipe, omxplayer shows it normally. I’ve also tried using the copy command in ffmpeg, and that also just returns data, doesn’t play the file.

  I understand that I can just concatenate the 2 files together, but that will not work for my purposes, because I will need to be able to feed files to the pipe while omxplayer is running