title: How merge two mp4 videos side by side with the help of FFMPEG and PHP code?
body: <p>Could anybody help me with the php code for FFMPEG to concatenate two mp4 videos and store the concatenated files as an mp4 at any folder in the server?
  i find command for ffmpeg.but i don't know how to make it work in php..
  ps: in the orther hand, is there any program like ffmpeg i can use?</p>