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• convert animated gif to video on linux server while preserving frame rate

  12 juin 2015, par pmedia

  how do I convert an animated gif to a video (e.g. h264@mp4) programmatically on a linux server ?

  I need this to process user generated content which should be output as several defined video formats ; therefore its possible, that users may want to process animated gif files. I already have a set of working php scripts to transcode videofiles to specific formats (like vpx@webm and h264@mp4, scaled to specific resolutions) using avconv, but herefore I need video input.

  Usual ways seem to be to extract the frames of the gif and then encode it, like

  convert file.gif file%03d.png 
  
  avconv -i file%03d.png file.mp4

  But this discards the frame rate, determined by the pause-informations within the gif-file. Its possible to define a framerate to avconv with -r, but

  • this does not respect the pause between frames, as they can differ (like 1st frame 100ms pause, 2nd frame 250ms pause, 3rd frame 100ms pause, ...)
  • as the input comes from users, it may even vary, as some gifs may have 5fps and others 30fps

  I noticed that avconv is able to process gifs by itself and therefore may respect the correct pauses, but when I do (like similarily described in How to convert GIF to Mp4 is it possible ?)

  avconv -i file.gif -r 30 file.mp4

  avconv will only take the first frame of the gif, while it detects the file at least as video :

  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
    Stream #0.0: Video: gif, pal8, 640x480, 25 tbn

  (example gif ’file.gif’ has 15 frames, each with 100ms pause => 1.5s duration, looping)

  • What am I missing ? Whats going wrong ?
  • Are there probably better tools for this use case ?
  • What are big sites like e.g. 9gag using to transcode uploaded gifs to video ?

• FFMPEG is not working centos linux server

  18 mars 2015, par User

  I am using FFMPEG for video thumbnails creation,

  I have downloaded FFMPEG (ffmpeg-2.4.2.tar.bz2) and installed in server.

  located in

  /usr/bin/ffmpeg

  and used in this below code :

  if($extension === 'mp4' OR $extension == 'MP4' )
  
  {
  
  $video = $timestamp.$imagename;
  
  $videoname=substr($imagename,0, -4).$timestamp;
  
  $image = "sites/default/files/content_images/{$videoname}-thumb.jpg";
  
  
  
  var_dump($video);
  
  
  
  $cmd="/usr/bin/ffmpeg -i /opt/lampp/htdocs/mydashboard/sites/default/files/content_videos/".$video." -ss 00:00:14.435 -f image2 -vframes 1 /opt/lampp/htdocs/mydashboard/sites/default/files/content_images/$videoname-thumb.jpg";
  
  
  
  $cmdstr = $cmd;
  
  $locale = 'en_IN.UTF-8';
  
  setlocale(LC_ALL, $locale);
  
  putenv('LC_ALL='.$locale);
  
  echo exec($cmd);

  but this command not working as i expect..

  $cmd="/usr/bin/ffmpeg -i /opt/lampp/htdocs/mydashboard/sites/default/files/content_videos/".$video." -ss 00:00:14.435 -f image2 -vframes 1 /opt/lampp/htdocs/mydashboard/sites/default/files/content_images/$videoname-thumb.jpg";

  issue was video thumbnail is not created,when we upload videos.

  any help great appreciation

• How to use FFMPEG in linux environment only for video thumbnails creation ?

  16 mars 2015, par User

  I am using FFMPEG for video thumbnails creation,

  I have downloaded FFMPEG (ffmpeg-2.4.2.tar.bz2).

  wrote code for that

  if($extension === 'mp4' OR $extension == 'MP4' )
  
  {
  
  $video = $timestamp.$imagename;
  
  $videoname=substr($imagename,0, -4).$timestamp;
  
  $image = "sites/default/files/content_images/{$videoname}-thumb.jpg";
  
  
  
  var_dump($video);
  
  
  
  $cmd="/usr/local/bin/ffmpeg -i /opt/lampp/htdocs/mydashboard/sites/default/files/content_videos/".$video." -ss 00:00:14.435 -f image2 -vframes 1 /opt/lampp/htdocs/mydashboard/sites/default/files/content_images/$videoname-thumb.jpg";
  
  
  
  $cmdstr = $cmd;
  
  $locale = 'en_IN.UTF-8';
  
  setlocale(LC_ALL, $locale);
  
  putenv('LC_ALL='.$locale);
  
  echo exec($cmd);

  Placed ffmpeg files in usr/local/bin folder.

  but video thumbnails are not created.

  can any one tel me how to use ffmpeg in linux server.