Hello everyone

i use following code for creating a animated gif of video file using following code but it give a error.
plz tell me how to use ffmpeg_animated_gif class file.

$destinationgif='/jupload/files/video/video/test.gif';
$frameNo=array(5,16,27,39,51);

$movie1 = new ffmpeg_movie($source, false);
$gif1 = new ffmpeg_animated_gif($agif, 450, 370, 3, 0);
for($i=0;$i<count($frameNo);$i++){

$img1 = $movie1->getFrame($frameNo[$i]);
$gif1->addFrame($img1);

}

$mkNewImg1 = new ffmpeg_frame($img1,1);

$gif1->addFrame($mkNewImg1);