diff --git a/build_ffmpeg.md b/ffmpeg.md
similarity index 55%
rename from build_ffmpeg.md
rename to ffmpeg.md
index 4fa5c2d..f263f04 100644
--- a/build_ffmpeg.md
+++ b/ffmpeg.md
@@ -69,4 +69,101 @@ sudo make install
     cd nv-codec-headers
     make
     sudo make install
-    ```
\ No newline at end of file
+    ```
+
+编译ffmeg arm64版本
+
+在源码目录下创建buildarm64.sh，内容如下
+
+```shell
+#!/bin/bash
+
+export NDK=~/android/android-ndk-r20b #这里配置先你的 NDK 路径
+TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64
+
+# 编译到安卓上，尽可能小一些(--enable-small)，只是用来解码，也就取消编译封装编码相关的
+function build_android
+{
+
+./configure \
+--disable-programs \
+--disable-avdevice \
+--disable-encoders \
+--disable-muxers \
+--disable-filters \
+--enable-neon  \
+--enable-gpl   \
+--disable-sdl2 \
+--disable-postproc \
+--disable-debug \
+--enable-small \
+--enable-static \
+--enable-shared \
+--disable-doc \
+--enable-ffmpeg \
+--disable-ffplay \
+--disable-ffprobe \
+--disable-avdevice \
+--disable-doc \
+--disable-symver \
+--prefix=$PREFIX \
+--cross-prefix=$CROSS_PREFIX \
+--target-os=android \
+--arch=$ARCH \
+--cpu=$CPU \
+--cc=$CC \
+--cxx=$CXX \
+--enable-cross-compile \
+--sysroot=$SYSROOT \
+--extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
+--extra-ldflags="$ADDI_LDFLAGS"
+
+
+make clean
+make -j16
+make install
+
+echo "============================ build android arm64-v8a success =========================="
+
+}
+
+#arm64-v8a
+ARCH=arm64
+CPU=armv8-a
+API=21
+CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang
+CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++
+SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
+CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
+PREFIX=$(pwd)/android/$CPU
+OPTIMIZE_CFLAGS="-march=$CPU"
+
+build_android
+
+
+```
+
+```shell
+chomd +x buildarm64.sh
+./buildarm64.sh
+# 编译好后，对应的源文件和库文件会安装到./android/armv-v8a中
+```
+
+## 硬编码
+
+```c++
+// 与软编码相比，没有很多额外的配置
+// 仅仅是在查找编码器时按名称查找 hevc_nvenc ,其余和软编码一样
+auto pCodec = avcodec_find_encoder_by_name("hevc_nvenc");
+// ...
+// 其次就是注意软编码出来的每一帧数据 前面都会带有SEI增强帧，关键帧后面才是I帧或者P帧
+	auto naluHeader = (pkt->data[4] & 0x7E) >> 1; // 前四个字节是0x00 00 00 01 分隔符
+    if (naluHeader == 39) { // SEI
+        auto header = getNextSplit(pkt->data, pkt->size); // 往后找，跳过这个SEI
+        if (header == nullptr)
+            return 0;
+        naluHeader = ((*header) & 0x7E) >> 1;
+        // cout << "naluHeader: " << naluHeader << endl;
+    }
+```
+
diff --git a/flutter_plugin.md b/flutter_plugin.md
new file mode 100644
index 0000000..807484c
--- /dev/null
+++ b/flutter_plugin.md
@@ -0,0 +1,76 @@
+# flutter plugin
+
+创建插件命令
+
+```shell
+flutter create --template=plugin --platforms=windows,android yourname
+```
+
+--platforms 可以指定支持哪些平台，如 windows，macos，ios，android，linux
+
+如果没有创建相应平台目录，可以使用下面的命令开启相应的平台
+
+```bash
+flutter config --enable-linux-desktop  # 开启linux 桌面
+flutter config --enable-macos-desktop  # 开启macos 桌面
+flutter config --enable-ios # 开启ios
+# 更多的命令可以通过help查看
+flutter config --help
+```
+
+## Android安卓
+
+1. gradle文件配置
+
+   ```gradle
+   defaultConfig {
+           minSdkVersion 19
+           ndk {
+           	// 只编译arm64
+               abiFilters "arm64-v8a"
+           }
+           
+           externalNativeBuild {
+           	// 依赖的自定义cmake路径
+               cmake {
+                   arguments "-DANDROID_ARM_NEON=TRUE", "-DANDROID_STL=c++_shared"
+                   path "../src/CMakeLists.txt"
+               }
+           }
+           consumerProguardFiles "consumer-rules.pro"
+       }
+       // 一部分动态库需要安装时一并打包，避免出现找不到依赖的动态库
+       sourceSets {
+           main {
+               // 指定动态库路径 安卓的需要的动态库我放到了../src/bin/arm64-v8a, 在指定时只需要到bin即可，但是一定得放到arm64-v8a里面
+               jniLibs.srcDirs = ['../src/bin/']
+           }
+   }
+   ```
+
+2. cmake 文件
+
+   ```cmake
+   # 安卓使用
+   cmake_minimum_required(VERSION 3.18)
+   
+   set(PROJECT_NAME "pass_track")
+   project(${PROJECT_NAME}) #  CXX
+   # 包含头文件搜索目录和库的搜索目录
+   # 指定所有需要编译的头文件和源文件${all_sources} ${all_headers}
+   add_library(${PROJECT_NAME} SHARED
+     ${all_sources}
+     ${all_headers}
+   )
+   
+   set_target_properties(${PROJECT_NAME} PROPERTIES
+     CXX_VISIBILITY_PRESET hidden)
+   
+   target_compile_definitions(${PROJECT_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
+   target_link_libraries(${PROJECT_NAME} PRIVATE 。。。)
+   
+   
+   
+   ```
+
+   
\ No newline at end of file