There are not many datacenters which offer FFmpeg servers. But before you choose the server be very careful. The success of the video sharing website solely rests on the quality and tools offered by the server. Make sure about the speed and the staff of the host is efficient. Or else your, complain may fall on deaf ears.
FFmpeg servers facilitates video streaming and in easy installation of scripts which permit in video sharing. Scripts like PHPmotion, Rayzz, OsTube, Clipshare and other such types are supported by FFmpeg tools.