Is this some bug!
My server has got back to me with this:
I just reinstalled ffmpeg and its components. I did a convert of an mps and a
svi file. All worked just fine.

And when I try to convert, I get this everytime:
Return value: Exiting...

Running flvtool2: /usr/bin/flvtool2 -U /home/xxxxxxxxxx/public_html/flvideo/11994622201329115951.flv

Convert Error or converted video is less than 1 kb in size, try upload a big video. If that do not work, verify convert command works on the server.
Sorry to be negative, but sort of useless if I have done everything asked, a piece of software going nowhere at the moment for me, would like someone to prove that I am doing something wrong.....