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• How to create slideshow from images with ffmpeg ?

  7 novembre 2012, par Arsen Zahray

  I want to create a slideshow from images, where each image would be displayed for some period of time (several seconds).

  How do I do that ?

  Currently I was trying to encode short clips with ffmpeg and then stitch those together with mencoder :

          foreach (var item in filePattern)
  
          {
  
              var otpt = item.Key + ".mpg";
  
              Process.Start("ffmpeg",
  
                  string.Format("-y -r 25 -f image2 -vframes 75 -i {0} {1}", item.Value, otpt)//-loop 1
  
                  ).WaitForExit();
  
          }

  ffmpeg -y -r 25 -f image2 -vframes 75 -i input-pattern output does create a file with 1 frame in it, while ffmpeg -y -loop 1 -r 25 -f image2 -vframes 75 -i input-pattern output on windows never finishes (needs ctrl+c to stop) ; the second command worked on linux for me.

  I need to make this work primary on Windows. Which params should I use ?

• Using ffmpeg with MAMP local server

  22 mai 2012, par dirk_22

  In my MAMP local server home folder on Mac OS X (htdocs), I have a bunch of images (labeled image0 through image(n)) which I would like to stitch together into a jpeg using ffmpeg. When I type the following command into terminal, a .mpg file is successfully generated.

  ffmpeg -f image2 -i image%d.jpg videofile.mpg

  However, when I try to execute the same command using the php code pasted below, nothing seems to happen.

  <?php
  
  shell_exec('ffmpeg -f image2 -i image%d.jpg videofile.mpg');
  
  ?>

  I've copied the installed ffmpeg folder on my home directory into htdocs, but ffmpeg doesn't seem to be accessed. I'm very new to PHP, so please feel free to point out any gross errors in my code. I'd just like the php script to accomplish the same task which terminal executes upon input of the aforementioned command. I'd welcome any and all advice. Cheers.

• Overlay video after set time offset with FFmpeg

  5 août 2012, par Produitbrut

  I'm trying to add overlays to an input video with ffmpeg that appear some time after the video starts.

  The basic way to add an overlay is :

  ffmpeg -i in.avi -vf "movie=overlay.avi [ovl]; [in][ovl] overlay" out.avi

  But this adds the overlay video (or image) from the start of the input video until one of the videos ends.

  I know how to offset the overlay video using movie=overlay.avi:seek_point=1.4, but what about an offset on the input video ?

  I could always clip the video to the desired point, add overlay on the second clip, then stitch the two but that's not very efficient.