为所有Android架构正确构建FFmpeg_Android_Ffmpeg_Android Ndk_Java Native Interface

为所有Android架构正确构建FFmpeg

android ffmpeg android-ndk

为所有Android架构正确构建FFmpeg,android,ffmpeg,android-ndk,java-native-interface,Android,Ffmpeg,Android Ndk,Java Native Interface,我为所有android架构构建了ffmpeg库。但有些细节让我困惑。首先，让我一步一步地解释我是如何构建的我从下载了最新版本的libx264 创建并运行build_all.shscript（在x264文件夹中）为（几乎）所有android平台创建lib。然后我得到了x264文件夹中的android文件夹。e、 gandroid/armandroid/arm64android/x86android/x86\u 64在x264文件夹中我从下载ffmpeg3.3.4 我创建了4份ffmpeg3

我为所有android架构构建了ffmpeg库。但有些细节让我困惑。首先，让我一步一步地解释我是如何构建的

我从下载了最新版本的
```
libx264
```
创建并运行
```
build_all.sh
```
script（在x264文件夹中）为（几乎）所有android平台创建lib。然后我得到了x264文件夹中的
```
android
```
文件夹。e、 g
```
android/arm
```
```
android/arm64
```
```
android/x86
```
```
android/x86\u 64
```
在x264文件夹中
我从下载
```
ffmpeg3.3.4
```
我创建了4份
```
ffmpeg3.3.4
```
文件夹。用安卓架构的名字给它们命名。如
```
ffmpeg3.3.4-arm64
```
```
ffmpeg3.3.4-arm
```
```
ffmpeg3.3.4-x86
```
```
ffmpeg3.3.4-x86
```


为android的每个平台创建了build（架构名称）.sh。然后根据体系结构名称将每个'named'.sh文件移动到命名的ffmpeg文件夹中。
例如build\u android\u x86.sh
=>ffmpeg3.3.4-x86


build\u android\u arm64.sh
示例
#!/bin/bash
#Change NDK to your Android NDK location
NDK=$HOME/Android/Sdk/ndk-bundle
PLATFORM=$NDK/platforms/android-21/arch-arm64/
PREBUILT=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64

GENERAL="\
--enable-small \
--enable-cross-compile \
--extra-libs="-lgcc" \
--arch=aarch64 \
--cc=$PREBUILT/bin/aarch64-linux-android-gcc \
--cross-prefix=$PREBUILT/bin/aarch64-linux-android- \
--nm=$PREBUILT/bin/aarch64-linux-android-nm \
--extra-cflags="-I../x264/android/arm64/include" \
--extra-ldflags="-L../x264/android/arm64/lib" "

MODULES="\
--enable-gpl \
--enable-libx264"



function build_arm64
{
  ./configure \
  --logfile=conflog.txt \
  --target-os=linux \
  --prefix=./android/arm64-v8a \
  ${GENERAL} \
  --sysroot=$PLATFORM \
  --extra-cflags="" \
  --extra-ldflags="-lx264 -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  --enable-shared \
  --disable-static \
  --disable-doc \
  --enable-zlib \
  ${MODULES}

  make clean
  make
  make install
}

build_arm64


echo Android ARM64 builds finished

将所有ffmpeg3.3.4-arm64
ffmpeg3.3.4-arm

ffmpeg3.3.4-x86

ffmpeg3.3.4-x86\u 64

文件夹移动到

NDK\u路径

（

C:\Users\MyName\AppData\Local\Android\sdk\NDK bundle

）

将
```
x264
```
文件夹与ffmpeg文件夹放在同一层次上在（
```
C:\Users\MyName\AppData\Local\Android\sdk\ndk bundle
```
）
运行每个
```
build\u android\u x86.sh
```
，
```
build\u android\u x86\u 64.sh
```
。。在各自的ffmpeg文件夹中逐个编写脚本。然后我得到了ffmpeg文件夹中的
```
android
```
文件夹。（创建的
```
android
```
文件夹具有库文件夹） e、 g
```
ffmpeg3.3.4-x86/android/x86/（bin、inlude、lib、share）
```

为所有创建的

Android

文件夹创建了

Android.mk

文件，并将每个文件夹移动到Android/armName文件夹。e、 g

Android.mk

ffmpeg3.3.4-x86/Android/x86/

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavcodec
LOCAL_SRC_FILES:= lib/libavcodec-57.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavformat
LOCAL_SRC_FILES:= lib/libavformat-57.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libswscale
LOCAL_SRC_FILES:= lib/libswscale-4.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavutil
LOCAL_SRC_FILES:= lib/libavutil-55.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavfilter
LOCAL_SRC_FILES:= lib/libavfilter-6.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libswresample
LOCAL_SRC_FILES:= lib/libswresample-2.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := postproc
LOCAL_SRC_FILES := lib/libpostproc-54.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avdevice
LOCAL_SRC_FILES := lib/libavdevice-57.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

在我的项目的jni文件夹中创建“arm命名”文件夹，例如
```
x86
```
```
x86\u 4
```
```
arm64
```
```
arm7
```
（
```
myproject/app/jni/x86
```
，
```
myproject/app/jni/x86\u 64
```
）
转到ndk路径逐个打开命名的ffmpeg文件夹，并将文件从ffmpeg文件夹复制到“arm命名”文件夹。e、 g
```
ffmpeg.c
```
=>
```
myproject/app/jni/x86
```

在我的项目中创建了Android.mk文件

LOCAL_PATH := $(call my-dir)
#$(warning $(LOCAL_PATH))

include $(CLEAR_VARS)
LOCAL_MODULE    := videoEdit
LOCAL_LDLIBS := -llog -ljnigraphics -lz -landroid
LOCAL_CFLAGS := -Wdeprecated-declarations
ANDROID_LIB := -landroid

$(info $(TARGET_ARCH_ABI))

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg-3.3.4-armeabi
    LOCAL_SRC_FILES :=  videoEdit.c arm7/ffmpeg.c arm7/ffmpeg_filter.c arm7/ffmpeg_opt.c arm7/cmdutils.c
    LOCAL_CFLAGS += -lx264 -Wl,--no-merge-exidx-entries
else

    ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
            LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg-3.3.4-arm64-v8a
            LOCAL_SRC_FILES :=  videoEdit.c arm64/ffmpeg.c arm64/ffmpeg_filter.c arm64/ffmpeg_opt.c arm64/cmdutils.c
            LOCAL_CFLAGS += -funwind-tables -Wl,--no-merge-exidx-entries
    else

        ifeq ($(TARGET_ARCH_ABI),x86_64)
               LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg3.3.4-x86_64
               LOCAL_SRC_FILES :=  videoEdit.c x86_64/ffmpeg.c x86_64/ffmpeg_filter.c x86_64/ffmpeg_opt.c x86_64/cmdutils.c
        else
                LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg3.3.4-x86
                LOCAL_SRC_FILES :=  videoEdit.c x86/ffmpeg.c x86/ffmpeg_filter.c x86/ffmpeg_opt.c x86/cmdutils.c
        endif

    endif

endif

LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil libswresample libavfilter libavdevice libpostproc

include $(BUILD_SHARED_LIBRARY)

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)

    $(call import-module,ffmpeg-3.3.4-armeabi/android/armeabi-v7a)

else

    ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
            $(call import-module,ffmpeg-3.3.4-arm64-v8a/android/arm64-v8a)
    else

        ifeq ($(TARGET_ARCH_ABI),x86_64)
               $(call import-module,ffmpeg3.3.4-x86_64/android/x86_64)
        else
            $(call import-module,ffmpeg3.3.4-x86/android/i686-diasm)
        endif

    endif

endif

APP_ABI := armeabi-v7a, arm64-v8a, x86_64, x86
APP_PLATFORM := android-14

在我的项目中创建了Application.mk文件

LOCAL_PATH := $(call my-dir)
#$(warning $(LOCAL_PATH))

include $(CLEAR_VARS)
LOCAL_MODULE    := videoEdit
LOCAL_LDLIBS := -llog -ljnigraphics -lz -landroid
LOCAL_CFLAGS := -Wdeprecated-declarations
ANDROID_LIB := -landroid

$(info $(TARGET_ARCH_ABI))

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg-3.3.4-armeabi
    LOCAL_SRC_FILES :=  videoEdit.c arm7/ffmpeg.c arm7/ffmpeg_filter.c arm7/ffmpeg_opt.c arm7/cmdutils.c
    LOCAL_CFLAGS += -lx264 -Wl,--no-merge-exidx-entries
else

    ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
            LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg-3.3.4-arm64-v8a
            LOCAL_SRC_FILES :=  videoEdit.c arm64/ffmpeg.c arm64/ffmpeg_filter.c arm64/ffmpeg_opt.c arm64/cmdutils.c
            LOCAL_CFLAGS += -funwind-tables -Wl,--no-merge-exidx-entries
    else

        ifeq ($(TARGET_ARCH_ABI),x86_64)
               LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg3.3.4-x86_64
               LOCAL_SRC_FILES :=  videoEdit.c x86_64/ffmpeg.c x86_64/ffmpeg_filter.c x86_64/ffmpeg_opt.c x86_64/cmdutils.c
        else
                LOCAL_C_INCLUDES:=/Users/MyName/AppData/Local/Android/sdk/ndk-bundle/sources/ffmpeg3.3.4-x86
                LOCAL_SRC_FILES :=  videoEdit.c x86/ffmpeg.c x86/ffmpeg_filter.c x86/ffmpeg_opt.c x86/cmdutils.c
        endif

    endif

endif

LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil libswresample libavfilter libavdevice libpostproc

include $(BUILD_SHARED_LIBRARY)

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)

    $(call import-module,ffmpeg-3.3.4-armeabi/android/armeabi-v7a)

else

    ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
            $(call import-module,ffmpeg-3.3.4-arm64-v8a/android/arm64-v8a)
    else

        ifeq ($(TARGET_ARCH_ABI),x86_64)
               $(call import-module,ffmpeg3.3.4-x86_64/android/x86_64)
        else
            $(call import-module,ffmpeg3.3.4-x86/android/i686-diasm)
        endif

    endif

endif

APP_ABI := armeabi-v7a, arm64-v8a, x86_64, x86
APP_PLATFORM := android-14

创建videoEdit.c，然后运行
```
ndk build
```
build命令

无错误构建。我可以运行ffmpeg命令，但我认为这需要花费太多的时间。例如，当我尝试运行

hflip

时，它会以15秒的时间翻转视频

代码示例：

JNIEXPORT jint JNICALL Java_com_name_app_library_VideoEditer_natives_VideoEditer_flipHorizontally
(JNIEnv *env, jclass someclass, jstring inputFile, jstring outFile) {

    int numberOfArgs = 14;

    char** arguments = calloc(numberOfArgs, sizeof(char*));
    const char *in, *out;

    in = (*env)->GetStringUTFChars(env, inputFile, 0);
    out = (*env)->GetStringUTFChars(env, outFile, 0);

    arguments[0] = "ffmpeg";
    arguments[1] = "-i";
    arguments[2] = in;
    arguments[3] = "-c:v";
    arguments[4] = "libx264";
    arguments[5] = "-preset";
    arguments[6] = "ultrafast";
    arguments[7] = "-threads";
    arguments[8] = "5";
    arguments[9] = "-c:a";
    arguments[10] = "copy";
    arguments[11] = "-vf";
    arguments[12] = "hflip";
    arguments[13] = out;

    int i;
    for (i = 0; i < numberOfArgs; i++) {
        log_message(arguments[i]);
    }
    log_message("Printed all");

    main(numberOfArgs, arguments);
    free(arguments);
    (*env)->ReleaseStringUTFChars(env, inputFile, in);
    (*env)->ReleaseStringUTFChars(env, outFile, out);

    return 0;
}

编辑在ubuntu上执行的所有步骤，然后将所有文件夹移动到windows。所以不要混淆路径

有了这些步骤，我想问的是，我的步骤有什么问题吗。我该不该走别的路？ffmpeg在真实设备上运行较慢的原因。我很想知道一件事，那就是retrica、snapchat、instagram如何以镜像翻转的方式录制视频？他们是在录制后翻页（如果是的话，他们是如何在一秒钟内完成的），还是在运行时以翻页的方式录制视频？我猜为android构建ffmpeg有点混乱，很容易出错。如果你看看我的步骤，问题，给我一个建议，我将不胜感激

ARCH                      x86 (generic)

这绝对是错误的，它应该列出具体的体系结构

我想这会对您有所帮助，我第一次使用它就能够正确地构建所有体系结构。您正在使用命令行ffmpeg，因此需要启用该程序。

我将查看构建文件的拱门。另外，您是否缺少

$（调用导入模块，android/cpufeatures）

？IIRC，这是打开霓虹灯优化代码所必需的。请查看哪个文件的版本，抱歉，无法理解。您的意思是libx264的生成文件还是ffmpeg文件的生成文件？确实缺少。我将添加

$（调用导入模块，android/cpufeatures）

让我们看看它的效果。@JamesPoag添加

cpufeatures

（编译无误）后，

hflip

视频的性能没有变化。@fthopkins很抱歉问了一个愚蠢的问题。为什么要使用libx264并在此目录中运行所有脚本？编译FFMPEG需要libx264吗？这个答案是解决我问题的最佳方法。谢谢。@fthopkins请告诉我们您做错了什么，以及如何解决问题。您是否遵循了解决问题的步骤？为了解决问题，您到底更新了哪些内容？