no display media and empty sound

linux ubuntu 11.10 32 bits

see in ..rt\bin

ldd fxavcodecplugin.so
linux-gate.so.1 => (0x005d6000)
libgstreamer-lite.so => not found
libgobject-2.0.so.0 => /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 (0x00255000)
libgthread-2.0.so.0 => /usr/lib/i386-linux-gnu/libgthread-2.0.so.0 (0x00668000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0x00f8a000)
libglib-2.0.so.0 => /lib/i386-linux-gnu/libglib-2.0.so.0 (0x00110000)
libavcodec.so.52 => not found
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0x00c39000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0x003ce000)
libffi.so.6 => /usr/lib/i386-linux-gnu/libffi.so.6 (0x00a30000)
libpcre.so.3 => /lib/i386-linux-gnu/libpcre.so.3 (0x00de2000)
/lib/ld-linux.so.2 (0x00ba8000)