准备工作--ffmpeg编译下载ndk,配置ndk环境下载ffmpeg源码编译FFmpeg编译ffmpeg错误记录

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我是靠谱客的博主重要朋友，这篇文章主要介绍准备工作--ffmpeg编译下载ndk,配置ndk环境下载ffmpeg源码编译FFmpeg编译ffmpeg错误记录，现在分享给大家，希望可以做个参考。

为了能更好的学习和运用ffmpeg, 建议下载ffmpeg源码自己编译.这里的编译方法基于ubuntu16.04环境.直接按照编译FFmpeg来做可能会碰到一些错误, 我将自己编译碰到的错误记录在最后面. 我自己编译的工程已经传到github上
https://github.com/yizhongliu/ffmpegForAndroid

下载ndk,配置ndk环境

https://developer.android.google.cn/ndk/downloads/
export ANDROID_NDK=/home/llm/Android/android-ndk-r19c-linux-x86_64/android-ndk-r17c/

这里建议使用android-ndk-r17c版本

下载ffmpeg源码

在FFmpeg官网下载最新4.1.3压缩文件
将下载的文件拷贝至合适的文件夹
在该目录下执行tar -jxvf ffmpeg-4.1.3.tar.bz2(请注意自己的版本和压缩格式)

编译FFmpeg

1 修改 ./configure 文件，该文件影响编译后so文件的命名，默认的命名在Android上会出现问题, 修改后生成以lib为前缀，.so为后置的name

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SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'  
LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'  
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'  
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR)$(SLIBNAME)'

替换成

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SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'  
LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'  
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'  
SLIB_INSTALL_LINKS='$(SLIBNAME)'

2 新建可执行文件，在根目录下新建 build_android.sh,我的环境文件内容如下:

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#!/bin/sh

MY_LIBS_NAME=ffmpeg-4.0
MY_DIR=ffmpeg-4.0

# cd ./${MY_DIR}

#编译的过程中产生的中间件的存放目录，为了区分编译目录，源码目录，install目录
MY_BUILD_DIR=binary

NDK_PATH=/home/llm/Android/android-ndk-r17c
BUILD_PLATFORM=linux-x86_64
TOOLCHAIN_VERSION=4.9
ANDROID_VERSION=21

ANDROID_ARMV5_CFLAGS="-march=armv5te"
ANDROID_ARMV7_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon"  #-mfloat-abi=hard -mfpu=vfpv3-d16 #-mfloat-abi=hard -mfpu=vfp
ANDROID_ARMV8_CFLAGS="-march=armv8-a"
ANDROID_X86_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
ANDROID_X86_64_CFLAGS="-march=x86-64 -msse4.2 -mpopcnt -m64 -mtune=intel"

# params($1:arch,$2:arch_abi,$3:host,$4:cross_prefix,$5:cflags)
build_bin() {

echo "-------------------star build $2-------------------------"

ARCH=$1         # arm arm64 x86 x86_64
    ANDROID_ARCH_ABI=$2     # armeabi armeabi-v7a x86 mips

PREFIX=$(pwd)/dist/${MY_LIBS_NAME}/${ANDROID_ARCH_ABI}/

HOST=$3
    SYSROOT=${NDK_PATH}/platforms/android-${ANDROID_VERSION}/arch-${ARCH}

CFALGS=$5

TOOLCHAIN=${NDK_PATH}/toolchains/${HOST}-${TOOLCHAIN_VERSION}/prebuilt/${BUILD_PLATFORM}
    CROSS_PREFIX=${TOOLCHAIN}/bin/$4-

# build 中间件
    BUILD_DIR=./${MY_BUILD_DIR}/${ANDROID_ARCH_ABI}

echo "pwd==$(pwd)"
    echo "ARCH==${ARCH}"
    echo "PREFIX==${PREFIX}"
    echo "HOST==${HOST}"
    echo "SYSROOT=${SYSROOT}"
    echo "CFALGS=$5"
    echo "CFALGS=${CFALGS}"
    echo "TOOLCHAIN==${TOOLCHAIN}"
    echo "CROSS_PREFIX=${CROSS_PREFIX}"

#echo "-------------------------按任意键继续---------------------"
    #read -n 1
    #echo "-------------------------继续执行-------------------------"

mkdir -p ${BUILD_DIR}   #创建当前arch_abi的编译目录,比如:binary/armeabi-v7a
    #cd ${BUILD_DIR}         #此处 进了当前arch_abi的2级编译目录

./configure 
         --prefix=${PREFIX} 
         --target-os=linux 
         --arch=${ARCH} 
         --sysroot=$SYSROOT 
         --enable-cross-compile 
         --cross-prefix=${CROSS_PREFIX} 
         --extra-cflags="-I$NDK_PATH/sysroot/usr/include/$4 -isysroot $NDK_PATH/sysroot $CFALGS -Os -fPIC -DANDROID -Wfatal-errors -Wno-deprecated" 
         --extra-cxxflags="-D__thumb__ -fexceptions -frtti" 
         --extra-ldflags="-L${SYSROOT}/usr/lib" 
         --enable-shared 
         --enable-asm 
         --enable-neon 
         --disable-encoders 
         --enable-encoder=aac 
         --enable-encoder=mjpeg 
         --enable-encoder=png 
         --enable-encoder=mpeg4 
         --disable-decoders 
         --enable-decoder=aac 
         --enable-decoder=aac_latm 
         --enable-decoder=h264 
         --enable-decoder=mpeg4 
         --enable-decoder=mjpeg 
         --enable-decoder=png 
         --disable-demuxers 
         --enable-demuxer=image2 
         --enable-demuxer=h264 
         --enable-demuxer=aac 
                 --enable-demuxer=mpegvideo 
                 --enable-demuxer=avi 
                 --enable-demuxer=mov 
         --disable-parsers 
         --enable-parser=aac 
         --enable-parser=ac3 
         --enable-parser=h264 
                 --enable-parser=mpeg4video 
                 --enable-parser=mjpeg 
         --enable-gpl 
         --disable-doc 
         --disable-ffmpeg 
         --disable-ffplay 
         --disable-ffprobe 
         --disable-symver 
         --disable-debug 
         --enable-small

make clean
    make
    make install

#从当前arch_abi编译目录跳出，对应上面的cd ${BUILD_DIR},以便function多次执行
        cd ../../

echo "-------------------$2 build end-------------------------"
}

# build armeabi
#build_bin arm armeabi arm-linux-androideabi arm-linux-androideabi "$ANDROID_ARMV5_CFLAGS"

#build armeabi-v7a
#build_bin arm armeabi-v7a arm-linux-androideabi arm-linux-androideabi "$ANDROID_ARMV7_CFLAGS"

#build arm64-v8a
build_bin arm64 arm64-v8a aarch64-linux-android aarch64-linux-android "$ANDROID_ARMV8_CFLAGS"

#build x86
#build_bin x86 x86 x86 i686-linux-android "$ANDROID_X86_CFLAGS"

#build x86_64
#build_bin x86_64 x86_64 x86_64 x86_64-linux-android "$ANDROID_X86_64_CFLAGS"

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#!/bin/sh

MY_LIBS_NAME=ffmpeg-4.0
MY_DIR=ffmpeg-4.0

# cd ./${MY_DIR}

#编译的过程中产生的中间件的存放目录，为了区分编译目录，源码目录，install目录
MY_BUILD_DIR=binary


NDK_PATH=/home/llm/Android/android-ndk-r17c
BUILD_PLATFORM=linux-x86_64
TOOLCHAIN_VERSION=4.9
ANDROID_VERSION=21

ANDROID_ARMV5_CFLAGS="-march=armv5te"
ANDROID_ARMV7_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon"  #-mfloat-abi=hard -mfpu=vfpv3-d16 #-mfloat-abi=hard -mfpu=vfp
ANDROID_ARMV8_CFLAGS="-march=armv8-a"
ANDROID_X86_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
ANDROID_X86_64_CFLAGS="-march=x86-64 -msse4.2 -mpopcnt -m64 -mtune=intel"


# params($1:arch,$2:arch_abi,$3:host,$4:cross_prefix,$5:cflags)
build_bin() {

    echo "-------------------star build $2-------------------------"

    ARCH=$1         # arm arm64 x86 x86_64
    ANDROID_ARCH_ABI=$2     # armeabi armeabi-v7a x86 mips

    PREFIX=$(pwd)/dist/${MY_LIBS_NAME}/${ANDROID_ARCH_ABI}/

    HOST=$3
    SYSROOT=${NDK_PATH}/platforms/android-${ANDROID_VERSION}/arch-${ARCH}

    CFALGS=$5


    TOOLCHAIN=${NDK_PATH}/toolchains/${HOST}-${TOOLCHAIN_VERSION}/prebuilt/${BUILD_PLATFORM}
    CROSS_PREFIX=${TOOLCHAIN}/bin/$4-

    # build 中间件
    BUILD_DIR=./${MY_BUILD_DIR}/${ANDROID_ARCH_ABI}

    echo "pwd==$(pwd)"
    echo "ARCH==${ARCH}"
    echo "PREFIX==${PREFIX}"
    echo "HOST==${HOST}"
    echo "SYSROOT=${SYSROOT}"
    echo "CFALGS=$5"
    echo "CFALGS=${CFALGS}"
    echo "TOOLCHAIN==${TOOLCHAIN}"
    echo "CROSS_PREFIX=${CROSS_PREFIX}"

    #echo "-------------------------按任意键继续---------------------"
    #read -n 1
    #echo "-------------------------继续执行-------------------------"

    mkdir -p ${BUILD_DIR}   #创建当前arch_abi的编译目录,比如:binary/armeabi-v7a
    #cd ${BUILD_DIR}         #此处 进了当前arch_abi的2级编译目录


    ./configure 
         --prefix=${PREFIX} 
         --target-os=linux 
         --arch=${ARCH} 
         --sysroot=$SYSROOT 
         --enable-cross-compile 
         --cross-prefix=${CROSS_PREFIX} 
         --extra-cflags="-I$NDK_PATH/sysroot/usr/include/$4 -isysroot $NDK_PATH/sysroot $CFALGS -Os -fPIC -DANDROID -Wfatal-errors -Wno-deprecated" 
         --extra-cxxflags="-D__thumb__ -fexceptions -frtti" 
         --extra-ldflags="-L${SYSROOT}/usr/lib" 
         --enable-shared 
         --enable-asm 
         --enable-neon 
         --disable-encoders 
         --enable-encoder=aac 
         --enable-encoder=mjpeg 
         --enable-encoder=png 
         --enable-encoder=mpeg4 
         --disable-decoders 
         --enable-decoder=aac 
         --enable-decoder=aac_latm 
         --enable-decoder=h264 
         --enable-decoder=mpeg4 
         --enable-decoder=mjpeg 
         --enable-decoder=png 
         --disable-demuxers 
         --enable-demuxer=image2 
         --enable-demuxer=h264 
         --enable-demuxer=aac 
                 --enable-demuxer=mpegvideo 
                 --enable-demuxer=avi 
                 --enable-demuxer=mov 
         --disable-parsers 
         --enable-parser=aac 
         --enable-parser=ac3 
         --enable-parser=h264 
                 --enable-parser=mpeg4video 
                 --enable-parser=mjpeg 
         --enable-gpl 
         --disable-doc 
         --disable-ffmpeg 
         --disable-ffplay 
         --disable-ffprobe 
         --disable-symver 
         --disable-debug 
         --enable-small


    make clean
    make
    make install

    #从当前arch_abi编译目录跳出，对应上面的cd ${BUILD_DIR},以便function多次执行
        cd ../../

    echo "-------------------$2 build end-------------------------"
}


# build armeabi
#build_bin arm armeabi arm-linux-androideabi arm-linux-androideabi "$ANDROID_ARMV5_CFLAGS"

#build armeabi-v7a
#build_bin arm armeabi-v7a arm-linux-androideabi arm-linux-androideabi "$ANDROID_ARMV7_CFLAGS"

#build arm64-v8a
build_bin arm64 arm64-v8a aarch64-linux-android aarch64-linux-android "$ANDROID_ARMV8_CFLAGS"

#build x86
#build_bin x86 x86 x86 i686-linux-android "$ANDROID_X86_CFLAGS"

#build x86_64
#build_bin x86_64 x86_64 x86_64 x86_64-linux-android "$ANDROID_X86_64_CFLAGS"

3 chmod 777 build_android.sh
4 ./build_android.sh

熟悉开源C/C++代码的人应该会了解,一般都采用automake的方式来编译软件, 编译的步骤都是

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./configure  //配置环境
./make   //编译
./make install   //安装

上面的sh最后编译了arm64-v8a的so, 需要编译其他arch, 将对应的#build 打开

编译ffmpeg错误记录

错误1:
找不到文件/home/llm/Android/android-ndk-r19c-linux-x86_64/android-ndk-r19c/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-gcc
原因:
Android NDK放弃GCC，全面转向Clang.详细解释参考https://chuansongme.com/n/2251372
解决:
改用android-ndk-r17c

错误2:
/home/llm/Android/android-ndk-r17c-linux-x86_64/android-ndk-r17c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/include/stdint.h:9:26: fatal error: stdint.h: No such file or directory #include_next <stdint.h>
原因:
NDK r17c版本将头文件和库文件进行了分离，我们指定的sysroot文件夹下只有库文件，而头文件放在了NDK目录下的sysroot内.
解决:
需在build_android.sh文件 –extra-cflags中添加 “-isysroot $NDK/sysroot”

错误3:

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libavcodec/aaccoder.c: In function 'search_for_ms':
libavcodec/aaccoder.c:803:25: error: expected identifier or '(' before numeric constant
                     int B0 = 0, B1 = 0;
                         ^
compilation terminated due to -Wfatal-errors.

和

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ibavcodec/hevc_mvs.c: In function 'derive_spatial_merge_candidates':
libavcodec/hevc_mvs.c:208:15: error: 'y0000000' undeclared (first use in this function)
             ((y ## v) >> s->ps.sps->log2_min_pu_size))
               ^

原因:
由于定义冲突导致的一个error,和ndk版本有关
解决:
修改libavcodec/aaccoder.c 文件 B0改成b0(ps:就是把int型变量名改一下,避免冲突,名字随便起).其他文件也可能报这个错误,按同样的方法修改

错误4: