server application error php

PHP-LINUX-ffmpeg help required?
I've ffmpeg installed on my Linux server. I am writing a php application to convert my uploaded videos to flv on server side. My script is executing fine, no errors, but no conversion :( . will any body help me?
use the built in ffmpeg functions of php. look at theis class http://www.phpclasses.org/browse/package/3747.html
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