You need FFmpeg, MPlayer and MEncoder for video processing. I’ll show you how to install and configure it on Hyper-V.
I’ve already posted couple of articles about CentOS 6 installation on Hyper-V, so I won’t mention about that again.

You can see CentOS 6 installation on Hyper-V at the following posts:

So I assume you have a CentOS 6 with Hyper-V LIS v3.1. So lets continue with our installation.
First, we need to install RPMforge repository on CentOS 6.

1. Install the DAG GPG key.

rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt