在装ffmpeg时，编译faac和faad2都出现这一错误：
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64/libm.a(s_sin.o): relocation R_X86_64_32S against `a local symbol' can not be used when making a shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64/libm.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make[2]: *** [libfaac.la] Error 1
make[2]: Leaving directory `/root/faac-1.28/libfaac'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/faac-1.28'
make: *** [all] Error 2

尝试使用shared library，不要使用static library编译。
vi common/mp4v2/mpeg4ip.h

删除第126行  char *strcasestr(const char *haystack, const char *needle);

然后 make clean  重新在 make

make install