Below is the link where you would find a very comprehensive guide to install and configure FFMPEG on your linux based system.
http://hubpages.com/hub/Install-ffmpeg-on-CentOS-64-bit-to-convert-3gp-video-files
FFMPEG is the open source project for converting Audio, Video and other media files to different formats. And also it provides lots of other features as well. Complete guide to FFMPEG can be found at http://ffmpeg.org.
Thanks.
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