FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

libavcodec provides implementation of a wider range of codecs.
libavformat implements streaming protocols, container formats and basic I/O access.
libavutil includes hashers, decompressors and miscellaneous utility functions.
libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
libavdevice provides an abstraction to access capture and playback devices.
libswresample implements audio mixing and resampling routines.
libswscale implements color conversion and scaling routines.

Tools

ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
ffplay is a minimalistic multimedia player.
ffprobe is a simple analysis tool to inspect multimedia content.
Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.

Android-ffmpeg

1.开始编译之前：

./configure --disable-x86asm

用于生成配置文件：ffbuild目录下的文件

arch.mak
comon.mak
config.fate
config.log
config.mak
config.sh
library.mak
等文件

2.开始编译之前还需要安装安装yasm （汇编编译器）和 nasm

yasm前往下载

yasm

1、运行
./configure
//configure脚本会寻找最合适的C编译器，并生成相应的makefile文件
2、编译文件
make
3、安装软件
sudo make install

nasm前往下载

安装方法同上

3.编译脚本:android_build.sh::不要着急开始执行---往下看

#!/usr/bin/env bash
#主要地址修改此处本机设备的NDK路径
NDK_HOME=/Users/zhenio/locks/android-ndk-r20
#输出目录
PREFIX=android-build
HOST_PLATFORM=darwin-x86_64
#最低支持版本
PLATFORM=android-18
#64位支持版本
PLATFORM_64=android-21

#日志输出目录
CONFIG_LOG_PATH=${PREFIX}/log
COMMON_OPTIONS=
CONFIGURATION=

build(){
    APP_ABI=$1
    echo "======== > Start build $APP_ABI"
    case ${APP_ABI} in
    armeabi )
        ARCH="arm"
        CPU="armv6"
        MARCH="armv6"
        TOOLCHAINS="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-arm"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mfloat-abi=softfp -mfpu=vfp"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/arm-linux-androideabi"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--disable-x86asm"
    ;;
    armeabi-v7a )
        ARCH="arm"
        CPU="armv7-a"
        MARCH="armv7-a"
        TOOLCHAINS="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-arm"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mfloat-abi=softfp -mfpu=vfpv3-d16"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/arm-linux-androideabi"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--fix-cortex-a8"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--enable-neon --disable-x86asm"
    ;;
    arm64-v8a )
        ARCH="aarch64"
        CPU="armv8-a"
        MARCH="armv8-a"
        TOOLCHAINS="$NDK_HOME/toolchains/aarch64-linux-android-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/aarch64-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM_64/arch-arm64"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/aarch64-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--enable-neon --disable-x86asm"
    ;;
    x86 )
        ARCH="x86"
        CPU="i686"
        MARCH="i686"
        TOOLCHAINS="$NDK_HOME/toolchains/x86-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/i686-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-x86"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mtune=intel -mssse3 -mfpmath=sse -m32"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/i686-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--disable-asm"
    ;;
    x86_64 )
        ARCH="x86_64"
        CPU="x86_64"
        MARCH="x86-64"
        TOOLCHAINS="$NDK_HOME/toolchains/x86_64-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/x86_64-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM_64/arch-x86_64"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mtune=intel -msse4.2 -mpopcnt -m64"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/x86_64-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib64 -L$SYSROOT/usr/lib64"
        EXTRA_OPTIONS="--disable-asm"
    ;;
    esac

    echo "-------- > Start clean workspace"
    make clean

    echo "-------- > Start build configuration"
    CONFIGURATION="$COMMON_OPTIONS"
    CONFIGURATION="$CONFIGURATION --logfile=$CONFIG_LOG_PATH/config_$APP_ABI.log"
    CONFIGURATION="$CONFIGURATION --prefix=$PREFIX"
    CONFIGURATION="$CONFIGURATION --libdir=$PREFIX/libs/$APP_ABI"
    CONFIGURATION="$CONFIGURATION --incdir=$PREFIX/includes/$APP_ABI"
    CONFIGURATION="$CONFIGURATION --pkgconfigdir=$PREFIX/pkgconfig/$APP_ABI"
    CONFIGURATION="$CONFIGURATION --arch=$ARCH"
    CONFIGURATION="$CONFIGURATION --cpu=$CPU"
    CONFIGURATION="$CONFIGURATION --cross-prefix=$CROSS_PREFIX"
    CONFIGURATION="$CONFIGURATION --sysroot=$SYSROOT"
    CONFIGURATION="$CONFIGURATION --extra-ldexeflags=-pie"
    CONFIGURATION="$CONFIGURATION $EXTRA_OPTIONS"

    echo "-------- > Start config makefile with $CONFIGURATION --extra-cflags="${EXTRA_CFLAGS}" --extra-ldflags="${EXTRA_LDFLAGS}""
    ./configure ${CONFIGURATION} \
        --extra-cflags="$EXTRA_CFLAGS" \
        --extra-ldflags="$EXTRA_LDFLAGS" 

    echo "-------- > Start make $APP_ABI with -j8"
    make -j8

    echo "-------- > Start install $APP_ABI"
    make install
    echo "++++++++ > make and install $APP_ABI complete."

}

build_all(){

    COMMON_OPTIONS="$COMMON_OPTIONS --target-os=android"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-static"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-shared"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-protocols"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-cross-compile"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-optimizations"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-debug"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-small"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-doc"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-programs"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffmpeg"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffplay"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffprobe"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-symver"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-network"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-pthreads"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-mediacodec"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-jni"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-zlib"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-pic"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-avresample"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=h264"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=mpeg4"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=mjpeg"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=png"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=vorbis"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=opus"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=flac"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-postproc"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-gpl"




    echo "COMMON_OPTIONS=$COMMON_OPTIONS"
    echo "PREFIX=$PREFIX"
    echo "CONFIG_LOG_PATH=$CONFIG_LOG_PATH"

    mkdir -p ${CONFIG_LOG_PATH}

    #  build $app_abi
     build "armeabi"
     build "armeabi-v7a"
     build "arm64-v8a"
     build "x86"
     build "x86_64"
}

echo "-------- Start --------"

build_all
echo "-------- End --------"

需要修改configure文件：

将如下内容注释掉：否则是无法生成so问题--具体什么原因，咱也不知道。总之注释掉就对了

# set_default target_os
# if test "$target_os" = android; then
#     cc_default="clang"
# fi

修改输出类型:

修改如下：

# 注释
# 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)'

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

为编译脚本添加可执行权限：

chmod 777 build_android.sh

功能定制：自行修改build_all处的参数：

查看所有编译配置选项：./configure --help
查看支持的解码器：./configure --list-decoders
查看支持的编码器：./configure --list-encoders
查看支持的硬件加速：./configure --list-hwaccels

完成以上操作就可以开始执行编译脚本了

 sudo ./build_android.sh
 注意：这里推荐使用sudo执行

等待最终结束so文件输出即可。。。

当前库所在目录为：android-build文件目录下libs对应CPU架构目录下

retbufs/Android-ffmpeg