FFmpeg wapmaster script prob plz help

[mafia28]

You will need to find the path of FFMPEG

i now path then what to do??

[subzero]

You will need to find the path of FFMPEG

[mafia28]

$file=htmlspecialchars(@$_GET['file']);

/*
* Withdrawal of a screenshot from the video 3gp
* 12.02.2011
*
*/

if (!class_exists(ffmpeg_movie))
{
die('This script wont work, you need to ffmpeg hosting !! Try ');
}

//creating an object (a test file test.3gp)


if (file_exists($file))
{
$mov = new ffmpeg_movie($file);
}
else
{
die('Error !! Can not find file !!');
}

//frame number
$frame = 10;

//width
$w = $mov->GetFrameWidth();

//height
$h = $mov->GetFrameHeight();

//extract frame
$ff_frame = $mov->getFrame($frame);

if ($ff_frame)
{
//format GD
$gd_image = $ff_frame->toGDImage();

if ($gd_image)
{
//output (for example, in the gif)
header('Content-type: image/gif');
imagegif($gd_image);

/*You can make a change in size, causing copyrights and watermarks, in general all that apply for GD*/
}
else
{
die('cannot be converted to GD');
}
}
else
{
die('can not extract frame');
}

/*
descriptions of all methods ffmpeg_movie look here
http://ffmpeg-php.sourceforge.net/doc/api/ffmpeg_movie.php
*/ 

i am getting this error msg in ffmpeg script for video preview i got this error msg, "Fatal error: Call to undefined method ffmpeg_frame::toGDImage() "

ffmpeg php- gd alredy installed, plz help