Ffmpeg-php? Please help !!!!!?

I have an upload video site like YouTube. When a video is uploaded you receive this message. . .
Fatal error: Class''not ffmpeg_movie found in / home / video / public_html / includes / function … 174 online
I was told that I need to install ffmpeg-hosting for PHP on my workload. Where can I find someone to do this for me, and what should I be looking to pay for the service.
Thanks in advance any additional information that may provide relevant information on this problem would be a great time or not.