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• HTML5 Video FFMPEG Shell Script

  18 novembre 2011, par Schermy

  I wrote this quick and dirty shell script to run ffmpeg over a bunch of files to generate webm/ogg/h.264 videos for a HTML5 site.

  #!/bin/bash
  
  
  
  ext=$1
  
  enc=$2
  
  
  
  #!/bin/bash
  
  for file in *.$ext; do
  
          while pidof /usr/local/bin/ffmpeg; do sleep 10; done >/dev/null
  
  
  
          ffmpeg -i "$file" -s 1280x720 -b 500k  "${file/%$ext/$enc}"   
  
  done

  It works great for my purposes but I've noticed that each video now takes a lot longe to convert and ffmpeg is not taking advantage of my multi-core setup.

  I would like to improve this script when I have some time and make it available for use by others but I'd like to solve this issue first.

  Thanks in advance for all of your help.

  P.S. This is setup to use the ffmpeg installation from brew on the Mac (and yes I would like to make this script more platform agnostic later on).

• When converting .mov to .flv video plays horizontally

  2 janvier 2014, par user291247

  When I record a video (.mov) through my iPhone it display vertically which is right.
  But after converting the .mov to .flv(using ffmpeg) it displays horizontally.

  My code :

  function convert_flv($vidtime,$infile, $outfile, $w = 0, $h = 0, $extra_infile = '', $extra_outfile = '') {
  
      $parms = '';
  
      if($w == 0 && $h == 0) {
  
          //$parms .= '-sameq ';
  
      } else {
  
          $parms = '-s {$w}x{$h} ';
  
      }
  
  
  
      if($vidtime==60) {
  
          $cmd = ffmpeg($infile, $outfile, $parms.' '.$extra_infile, '-t 00:01:00 -ar 22050 -r 15 -f flv  '.$extra_outfile);
  
      } else {
  
          $cmd = ffmpeg($infile, $outfile, $parms.' '.$extra_infile, '-t 00:04:00 -ar 22050 -r 15 -f flv  '.$extra_outfile);
  
      }
  
  
  
      print_r($cmd);
  
      return $cmd;
  
  }

• Use ffmpeg to watermark and scale an image on video

  11 mai 2015, par Ae.

  I want to be able to watermark videos with a logo image, which contains a website url.
  The videos can be of different formats and dimension.
  I’m trying to figure out a generic ffmpeg command to achieve it, so that i don’t have to tweak the command depending on the video i have to process.
  So far i got :

  ffmpeg -i sample.mov -sameq -acodec copy -vf 'movie=logo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]' sample2.mov

  In this way though the logo will look too big or too small with video of different size.
  I’ve seen there is a scale option for avfilter, but I haven’t figure out whether it’s possible to resize the image logo based on the dimension of the input video, so that I can say to scale the logo to 1/3 of the video length for example, and keep the image ratio.

  Any idea ? doesn’t need to be done in a single command, could even be a script.
  thanks in advance.