diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f6f2933..f74d6395 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,7 +46,7 @@ message("#######################################################################
 
 # setup include dir and lib dir
 include_directories(${LITE_AI_ROOT_DIR})
-link_directories(${LITE_AI_ROOT_DIR}/lib)
+link_directories(${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME})
 
 # include custom cmake files.
 include(cmake/setup_opencv_libs.cmake)
diff --git a/README.md b/README.md
index 27897bfa..c5aa2883 100644
--- a/README.md
+++ b/README.md
@@ -256,16 +256,48 @@ The output is:
     cp -r you-path-to-downloaded-or-built-TNN/include/tnn lite.ai.toolkit/tnn
   ```
 
-and put the libs into **lite.ai.toolkit/lib** directory. Please reference the build-docs[<sup>1</sup>](#lite.ai.toolkit-1) for **third_party**.
-* **lite.ai.toolkit/lib**
+and put the libs into **lite.ai.toolkit/lib/(linux|windows)** directory. Please reference the build-docs[<sup>1</sup>](#lite.ai.toolkit-1) for **third_party**.
+* **lite.ai.toolkit/lib/(linux|windows)**
   ```shell
-    cp you-path-to-downloaded-or-built-opencv/lib/*opencv* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-onnxruntime/lib/*onnxruntime* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-MNN/lib/*MNN* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-ncnn/lib/*ncnn* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-TNN/lib/*TNN* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-opencv/lib/(linux|windows)/*opencv* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-onnxruntime/lib/(linux|windows)/*onnxruntime* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-MNN/lib/(linux|windows)/*MNN* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-ncnn/lib/(linux|windows)/*ncnn* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-TNN/lib/(linux|windows)/*TNN* lite.ai.toolkit/lib
   ```
 
+Note, your also need to install ffmpeg(<=4.2.2) in Linux to support the opencv videoio module. See [issue#203](https://github.com/DefTruth/lite.ai.toolkit/issues/6). In MacOS, ffmpeg4.2.2 was been package into lite.ai.toolkit, thus, no installation need in OSX. In Windows, ffmpeg was been package into opencv dll prebuilt by the team of opencv. Please make sure -DWITH_FFMPEG=ON and check the configuration info when building opencv.
+* first, build ffmpeg(<=4.2.2) from source.
+```shell
+git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git -b n4.2.2
+cd ffmpeg
+./configure --enable-shared --disable-x86asm --prefix=/usr/local/opt/ffmpeg --disable-static
+make -j8
+make install
+```
+* then, build opencv with -DWITH_FFMPEG=ON, just like
+```shell
+#!/bin/bash
+
+mkdir build
+cd build
+
+cmake .. \
+  -D CMAKE_BUILD_TYPE=Release \
+  -D CMAKE_INSTALL_PREFIX=your-path-to-custom-dir \
+  -D BUILD_TESTS=OFF \
+  -D BUILD_PERF_TESTS=OFF \
+  -D BUILD_opencv_python3=OFF \
+  -D BUILD_opencv_python2=OFF \
+  -D BUILD_SHARED_LIBS=ON \
+  -D BUILD_opencv_apps=OFF \
+  -D WITH_FFMPEG=ON 
+  
+make -j8
+make install
+cd ..
+```
+after built opencv, you can follow the steps to build lite.ai.toolkit.
 
 * Windows: You can reference to [issue#6](https://github.com/DefTruth/lite.ai.toolkit/issues/6)
 * Linux: The Docs and Docker image for Linux will be coming soon ~ [issue#2](https://github.com/DefTruth/lite.ai.toolkit/issues/2)
diff --git a/README.zh.md b/README.zh.md
index e70cd2ca..57b83a68 100644
--- a/README.zh.md
+++ b/README.zh.md
@@ -257,16 +257,47 @@ static void test_default()
     cp -r you-path-to-downloaded-or-built-TNN/include/tnn lite.ai.toolkit/tnn
   ```
 
-然后把各个依赖库拷贝到**lite.ai.toolkit/lib** 文件夹。 请参考依赖库的编译文档[<sup>1</sup>](#lite.ai.toolkit-1)。
-* **lite.ai.toolkit/lib**
+然后把各个依赖库拷贝到**lite.ai.toolkit/lib/(linux|windows)** 文件夹。 请参考依赖库的编译文档[<sup>1</sup>](#lite.ai.toolkit-1)。
+* **lite.ai.toolkit/lib/(linux|windows)**
   ```shell
-    cp you-path-to-downloaded-or-built-opencv/lib/*opencv* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-onnxruntime/lib/*onnxruntime* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-MNN/lib/*MNN* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-ncnn/lib/*ncnn* lite.ai.toolkit/lib
-    cp you-path-to-downloaded-or-built-TNN/lib/*TNN* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-opencv/lib/(linux|windows)/*opencv* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-onnxruntime/lib/(linux|windows)/*onnxruntime* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-MNN/lib/(linux|windows)/*MNN* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-ncnn/lib/(linux|windows)/*ncnn* lite.ai.toolkit/lib
+    cp you-path-to-downloaded-or-built-TNN/lib/(linux|windows)/*TNN* lite.ai.toolkit/lib
   ```
-
+注意，你还需要安装ffmpeg(<=4.2.2)，因为opencv的videoio模块依赖ffmpeg进行mp4的编解码。参考[issue#203](https://github.com/DefTruth/lite.ai.toolkit/issues/6) . 在MacOS下，ffmpeg4.2.2已经作为一个自定义依赖库被我打包进lite.ai.toolkit，不需要再从HomeBrew安装为系统库，因此lite.ai.toolkit是单体的，你可以把它移植到app里面，不用心另一台运行app的机器没有ffmpeg，MacOS版本的lite.ai.toolkit已经包含ffmpeg. 在Windows下，opencv官方团队已经提供了用于opencv的ffmpeg预编译库。在Linux下编译opencv时，请确保-DWITH_FFMPEG=ON，并检查是否链接到ffmpeg. 
+* 先编译ffmpeg，注意必须是低版本的，高于4.4的，opencv会不兼容。
+```shell
+git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git -b n4.2.2
+cd ffmpeg
+./configure --enable-shared --disable-x86asm --prefix=/usr/local/opt/ffmpeg --disable-static
+make -j8
+make install
+```
+* 然后，编译带ffmpeg支持的OpenCV，指定-DWITH_FFMPEG=ON
+```shell
+#!/bin/bash
+
+mkdir build
+cd build
+
+cmake .. \
+  -D CMAKE_BUILD_TYPE=Release \
+  -D CMAKE_INSTALL_PREFIX=your-path-to-custom-dir \
+  -D BUILD_TESTS=OFF \
+  -D BUILD_PERF_TESTS=OFF \
+  -D BUILD_opencv_python3=OFF \
+  -D BUILD_opencv_python2=OFF \
+  -D BUILD_SHARED_LIBS=ON \
+  -D BUILD_opencv_apps=OFF \
+  -D WITH_FFMPEG=ON 
+  
+make -j8
+make install
+cd ..
+```
+编译完opencv后，你就可以按照上述的步骤，继续编译lite.ai.toolkit.
 
 * Windows: 你可以参考[issue#6](https://github.com/DefTruth/lite.ai.toolkit/issues/6) ，讨论了常见的编译问题。
 * Linux: 参考MacOS下的编译，替换Linux版本的依赖库即可。Linux下的发行版本将会在近期添加 ~ [issue#2](https://github.com/DefTruth/lite.ai.toolkit/issues/2)
diff --git a/cmake/lite.ai.toolkit-cmd.cmake b/cmake/lite.ai.toolkit-cmd.cmake
index 4a6527aa..b2ab4a48 100644
--- a/cmake/lite.ai.toolkit-cmd.cmake
+++ b/cmake/lite.ai.toolkit-cmd.cmake
@@ -131,31 +131,35 @@ function(add_lite_ai_toolkit_engines_libs_command)
     # copy opencv libs
     if (INCLUDE_OPENCV)
         message("Installing OpenCV libs        ->  INCLUDE_OPENCV:      ${INCLUDE_OPENCV} ...")
-        file(GLOB ALL_OpenCV_LIBS ${LITE_AI_ROOT_DIR}/lib/*opencv*)
+        file(GLOB ALL_OpenCV_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*opencv*)
+        file(GLOB FFMPEG_AV_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*av*)
+        file(GLOB FFMPEG_SW_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*sw*)
         file(INSTALL ${ALL_OpenCV_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
+        file(INSTALL ${FFMPEG_AV_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
+        file(INSTALL ${FFMPEG_SW_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
     endif()
     # copy onnxruntime libs
     if (ENABLE_ONNXRUNTIME)
         message("Installing ONNXRuntime libs  ->  ENABLE_ONNXRUNTIME: ${ENABLE_ONNXRUNTIME} ...")
-        file(GLOB ALL_ONNXRUNTIME_LIBS ${LITE_AI_ROOT_DIR}/lib/*onnxruntime*)
+        file(GLOB ALL_ONNXRUNTIME_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*onnxruntime*)
         file(INSTALL ${ALL_ONNXRUNTIME_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
     endif()
     # copy MNN libs
     if (ENABLE_MNN)
         message("Installing MNN libs         ->  ENABLE_MNN:          ${ENABLE_MNN} ...")
-        file(GLOB ALL_MNN_LIBS ${LITE_AI_ROOT_DIR}/lib/*MNN*)
+        file(GLOB ALL_MNN_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*MNN*)
         file(INSTALL ${ALL_MNN_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
     endif()
     # copy NCNN libs
     if (ENABLE_NCNN)
         message("Installing NCNN libs        ->  ENABLE_NCNN:         ${ENABLE_NCNN} ...")
-        file(GLOB ALL_NCNN_LIBS ${LITE_AI_ROOT_DIR}/lib/*ncnn*)
+        file(GLOB ALL_NCNN_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*ncnn*)
         file(INSTALL ${ALL_NCNN_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
     endif()
     # copy TNN libs
     if (ENABLE_TNN)
         message("Installing TNN libs        ->  ENABLE_TNN:           ${ENABLE_TNN} ...")
-        file(GLOB ALL_TNN_LIBS ${LITE_AI_ROOT_DIR}/lib/*TNN*)
+        file(GLOB ALL_TNN_LIBS ${LITE_AI_ROOT_DIR}/lib/${PLATFORM_NAME}/*TNN*)
         file(INSTALL ${ALL_TNN_LIBS} DESTINATION ${LIBRARY_OUTPUT_PATH})
     endif()
 endfunction()
diff --git a/cmake/lite.ai.toolkit.cmake b/cmake/lite.ai.toolkit.cmake
index 2f6c06a3..4e32980b 100644
--- a/cmake/lite.ai.toolkit.cmake
+++ b/cmake/lite.ai.toolkit.cmake
@@ -1,6 +1,11 @@
 add_lite_ai_toolkit_shared_library(${VERSION_STRING} ${SOVERSION_STRING})
 add_lite_ai_toolkit_engines_headers_command()
-add_lite_ai_toolkit_engines_libs_command()
+
+# TODO: Windows需要之后兼容
+if(${PLATFORM_NAME} MATCHES macos OR ${PLATFORM_NAME} MATCHES linux)
+    add_lite_ai_toolkit_engines_libs_command()
+endif()
+
 if(${PLATFORM_NAME} MATCHES macos OR ${PLATFORM_NAME} MATCHES linux)
     add_lite_ai_toolkit_test_custom_command()
 endif()
diff --git a/cmake/setup_opencv_libs.cmake b/cmake/setup_opencv_libs.cmake
index ba9eee7d..5e20d241 100644
--- a/cmake/setup_opencv_libs.cmake
+++ b/cmake/setup_opencv_libs.cmake
@@ -5,7 +5,7 @@ set(OpenCV_LIBS
         opencv_imgproc
         opencv_imgcodecs
         opencv_video
-        opencv_videoio
+        opencv_videoio  # need ffmpeg for mp4 io
         ) # need only
 message("###########################################################################################")
 
diff --git a/lib/.gitignore b/lib/.gitignore
index b521b7d7..e43b0f98 100644
--- a/lib/.gitignore
+++ b/lib/.gitignore
@@ -1,3 +1 @@
-windows
-linux
-android
\ No newline at end of file
+.DS_Store
diff --git a/lib/android/.gitignore b/lib/android/.gitignore
new file mode 100644
index 00000000..e69de29b
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diff --git a/lib/linux/.gitignore b/lib/linux/.gitignore
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index 00000000..e69de29b
diff --git a/lib/macos/.gitignore b/lib/macos/.gitignore
new file mode 100644
index 00000000..e69de29b
diff --git a/lib/libMNN.dylib b/lib/macos/libMNN.dylib
similarity index 100%
rename from lib/libMNN.dylib
rename to lib/macos/libMNN.dylib
diff --git a/lib/libTNN.0.dylib b/lib/macos/libTNN.0.dylib
similarity index 100%
rename from lib/libTNN.0.dylib
rename to lib/macos/libTNN.0.dylib
diff --git a/lib/libTNN.dylib b/lib/macos/libTNN.dylib
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rename from lib/libTNN.dylib
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diff --git a/lib/libncnn.1.dylib b/lib/macos/libncnn.1.dylib
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rename to lib/macos/libncnn.1.dylib
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rename from lib/libncnn.dylib
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diff --git a/lib/libonnxruntime.1.7.0.dylib b/lib/macos/libonnxruntime.1.7.0.dylib
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rename from lib/libonnxruntime.dylib
rename to lib/macos/libonnxruntime.dylib
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