I followed the steps from one of the helping site having URL

http://vexxhost.com/blog/category/ffmpeg/

You can see those steps on the above given link
I followed the actual installation process and not copy paste the ffmpeg.so
Version which i installed on server(fedora core 8) is ffmpeg-php-0.5.0

Here i read something about this error... you can also see

http://blog.snapshotit.com/?p=3