what´s this?

[donnel]

Fatal error: Cannot instantiate non-existent class: ffmpeg_movie in /srv/www/vhosts/rollsportclips.com/httpdocs/upload.php on line 205



what means that error? and what must i do.
it comes after a file is uploaded

:?: :?: :?: :?: :?: :?:

[buyscripts]

You don't have ffmpeg-php working on the server.see

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