$file = "file.avi" ; 

$movie = new ffmpeg_movie ( $file ); 

$gif =new ffmpeg_animated_gif 

("image.gif" ,100 , 100 , 24 ); 

for ( $frame = 150 ; $frame <= 200; 

$frame ++) { 

$image = $movie -> getFrame 

($frame ); 

$gif -> addFrame ( $image );}