前面我们用在ubuntu下编译了android的动态库，但实际开发中，我们可能需要在android 这类开发工具中开发基于太ffmpeg的视频应用。在android studio 中编译需要注意以下几点
1. As ndk 对应的sdk不能大于编译ffmpeg本身编译的NDK中使用的SDK。可以在application.mk中指定：
APP_PLATFORM := android-XX 如果XX小于了ffmpeg编译的SDK，则会报如log2无法链接这类问题
2. 编译库的链接顺序必须要对，一般有这样规律，主库要在依赖库前面链接。对于需要filter的系统来说一般的链接顺序如下：avformat avfilter avcodec x264 avresample swresample freetype libpng avutil swscale postproc
下面给出编译的具体make文件
#APP_ABI := armeabi armeabi-v7a x86
ifeq ($(APP_ABI), x86)
LIB_NAME_PLUS := x86
else
LIB_NAME_PLUS := armeabi
endif
LOCAL_PATH:= $(call my-dir)
LOCAL_ALLOW_UNDEFINED_SYMBOLS := true
include $(CLEAR_VARS)
LOCAL_MODULE:= avcodec-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES:= prebuilt/$(LIB_NAME_PLUS)/libavcodec.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := swresample-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libswresample.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := avresample-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libavresample.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := x264-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libx264.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := swscale-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libswscale.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := freetype-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libfreetype.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE:= avfilter-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES:= prebuilt/$(LIB_NAME_PLUS)/libavfilter.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE:= avformat-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES:= prebuilt/$(LIB_NAME_PLUS)/libavformat.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := avutil-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libavutil.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := postproc-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libpostproc.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libpng17-prebuilt-$(LIB_NAME_PLUS)
LOCAL_SRC_FILES := prebuilt/$(LIB_NAME_PLUS)/libpng17.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
ifeq ($(APP_ABI), x86)
TARGET_ARCH:=x86
TARGET_ARCH_ABI:=x86
else
LOCAL_ARM_MODE := arm
endif
LOCAL_ALLOW_UNDEFINED_SYMBOLS := true
LOCAL_MODULE := libffmpegjni
LOCAL_SRC_FILES := CarEyeJni.c CarEyeEncoderAPI.cpp FFVideoFilter.cpp CarEyeOSDAPI.cpp CarEyeMPEGAPI.cpp CarEyeDecoderAPI.cpp
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog -lz -lm
LOCAL_STATIC_LIBRARIES := avformat-prebuilt-$(LIB_NAME_PLUS) \
avfilter-prebuilt-$(LIB_NAME_PLUS) \
avcodec-prebuilt-$(LIB_NAME_PLUS) \
x264-prebuilt-$(LIB_NAME_PLUS) \
avresample-prebuilt-$(LIB_NAME_PLUS) \
swresample-prebuilt-$(LIB_NAME_PLUS) \
freetype-prebuilt-$(LIB_NAME_PLUS) \
libpng17-prebuilt-$(LIB_NAME_PLUS) \
avutil-prebuilt-$(LIB_NAME_PLUS) \
swscale-prebuilt-$(LIB_NAME_PLUS) \
postproc-prebuilt-$(LIB_NAME_PLUS)
LOCAL_C_INCLUDES += -L$(SYSROOT)/usr/include
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include
ifeq ($(APP_ABI), x86)
LOCAL_CFLAGS := -DUSE_X86_CONFIG
else
LOCAL_CFLAGS := -DUSE_ARM_CONFIG
endif
include $(BUILD_SHARED_LIBRARY) 相关代码请参考car-eye 开源网站和github为准
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