Android FFMPEG reference error

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := pre_libavcodec
LOCAL_SRC_FILES := libavcodec.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := ffmpeg
LOCAL_ARM_MODE := arm
LOCAL_SRC_FILES := FFMPlugin.cpp

#LOCAL_LDFLAGS = -Wl,--fix-cortex-a8
LOCAL_LDLIBS := -llog -lz
LOCAL_CFLAGS = -O3 -D__STDC_CONSTANT_MACROS

LOCAL_C_INCLUDES := $(LOCAL_PATH) \
	$(LOCAL_PATH)/ffmpeg \
	$(LOCAL_PATH)/ffmpeg/include

LOCAL_STATIC_LIBRARIES := pre_libavcodec
include $(BUILD_SHARED_LIBRARY)

ERROR MSG:
d:/androidndk/toolchains/arm-linux-androideabi-4.6/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld.exe: ./obj/local/armeab
i-v7a/objs/ffmpeg/FFMPlugin.o: in function Java_com_ssb_droidsound_plugins_FFMPlugin_N_1load:jni/FFMPlugin/FFMPlugin.cpp:15: error: undefined reference to 'av_register_all()'
collect2: ld returned 1 exit status