root@vhn05 [/usr/local/src/ffmpeg]# /usr/local/bin/ffmpeg -help
/usr/local/bin/ffmpeg: error while loading shared libraries: libamrnb.so.2: cannot open shared object file: No such file or directory
root@vhn05 [/usr/local/src/ffmpeg]# vi /etc/ld.so.conf
root@vhn05 [/usr/local/src/ffmpeg]# ldconfig
root@vhn05 [/usr/local/src/ffmpeg]# /usr/local/bin/ffmpeg -help
FFmpeg version SVN-r8799, Copyright (c) 2000-2007 Fabrice Bellard, et al.