video encoding for mobile devices

hi all

i'm after an rpm that we can use for video encoding 3gp, mp4 (for mobile 
devices), and wmv (for web)
i tried ffmpeg, but couldn't find an rpm that supported the amr_nb 
plugin, which i need to convert from and to 3gp

i know ffmpeg will work if i can compile from src, cos i did use that, 
but i really desperately need an rpm

does anyone know of an mencoder or transcode rpm or any other app, or 
preferably an ffmpeg rpm that i will be able to download that can 
support the above formats?

thanks
dave