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• How to install ffmpeg using xampp

  28 avril 2014, par Paul Ledger

  I am trying to install ffmpeg onto my localhost server. I have followed countless blogs and tutorials online form other people who are stuck with this same problem. I follow everything to the letter.

  1. Unzip the file
  2. Copy php_ffmpeg.exe to ext folder in php
  3. copy the rest to system 32

  As it says however when I do this I get this error when I start apache.

  

  Fair play but it is in the folder

  

  I also get this error as well :

  

  And Again, here it is :
  

  I have added the extention to my php.ini file

  extension=php_ffmpeg.dll

  The first time I go this to work I placed the ffmpeg.exe file onto my local host server and ran commands like this :

  $cmd = "$ffmpegpath -i $input -an -ss $sec -s $size $output";
  
  shell_exec($cmd);

  This works fine on my computer but not on an actual server. Could somebody offer some advice or guidene on where I have one wrong installing the extension or why running the .exe file on a lunix server with shell_exec doesn’t work

• isom : convert mp4 dvdsub extradata to vobsub format

  12 mars 2014, par wm4

  isom : convert mp4 dvdsub extradata to vobsub format
  mp4 files embedding DVD subtitles do not use the same extradata format
  
  as the rest of Libav expects. The subtitle decoder in libavcodec in
  
  particular does not understand this format.
  Convert the extradata to the vobsub .idx format. mp4 stores the palette
  
  as binary 32 bit ints in YUV. The subtitle resolution is stored
  
  separately in the track header, which we access through AVStream.
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavformat/isom.c

• Video Encode different parts of video using different bitrates

  8 février 2015, par khateeb

  If I’ve a video like : video-lectures

  

  And I need to encode the slides with high bitrate (as it’s the most important to the user) and encode the rest of the view with low bitrate.

  1. Select the part to encode with high bitratre.
     

  2. Separately Encoding the different parts with different bitrates.

  

  3. Combine the different parts into one video.

  The purpose is to reduce the total file-size to be published online, hence reduce the bandwidth needed.
  I need to do that using ffmpeg.
  I’ll use that approach in encoding video-lectures recorded with still camera (180 degree view like the images above), since I know which regions are more useful to students (board and slides) than other regions.