wierd error, help?

What does this mean?

Fatal error: Class 'ffmpeg_movie' not found in /home/voodora/public_html/upload.php on line 308

and how do i fix it? this happened when i tried to upload a video...

thank you

ffmpeg-php not working properly on your server.

See

http://forums.buyscripts.in/viewtopic.php?t=294