编译FFmpeg，ffmpeg4.1.4成功编译（2）

在上一篇（1）的基础上，进行编译ffmpeg4.1.4

上一篇（1）中已经安装了所有需要的基础东西：
VM虚拟机
Linux（Ubuntu）系统
android-ndk-r14b （这里依旧使用这个版本）

我这里又安装了一些可能用到的工具集

vim autoconf automake libtool pkg-config curl cmake gcc gperf texinfo yasm nasm bison autogen patch git

下载ffmpeg4.1.4

这次我是直接在Windows上修改好configure，和build-4.1.4 脚本

不同版本的configure是不同的，所以是不通用的。每次都要手动替换那几行

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)'  

改为

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

脚本，这里是全平台的，可以自己删掉不需要的

#!/bin/bash
NDK=/home/zhangyu/ffmpeg/android-ndk-r14b

function build_android
{
echo "Compiling FFmpeg for $CPU"
./configure \
    --prefix=$PREFIX \
    --enable-neon \
    --enable-hwaccels \
    --enable-gpl \
    --enable-postproc \
    --enable-shared \
    --enable-jni \
    --enable-mediacodec \
    --enable-decoder=h264_mediacodec \
    --disable-static \
    --disable-doc \
    --enable-ffmpeg \
    --disable-ffplay \
    --disable-ffprobe \
    --enable-avdevice \
    --disable-doc \
    --disable-symver \
    --cross-prefix=$CROSS_PREFIX \
    --target-os=android \
    --arch=$ARCH \
    --cpu=$CPU \
    --enable-cross-compile \
    --sysroot=$SYSROOT \
    --extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
    --extra-ldflags="$ADDI_LDFLAGS" \
    $ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
echo "The Compilation of FFmpeg for $CPU is completed"
}

#armv8-a
ARCH=arm64
CPU=armv8-a
TOOLCHAIN=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU"
build_android

#armv7-a
ARCH=arm
CPU=armv7-a
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
build_android

#x86
ARCH=x86
CPU=x86
TOOLCHAIN=$NDK/toolchains/x86-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/i686-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
build_android

#x86_64
ARCH=x86_64
CPU=x86-64
TOOLCHAIN=$NDK/toolchains/x86_64-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/x86_64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU -msse4.2 -mpopcnt -m64 -mtune=intel"
build_android

将这个ffmpeg-4.1.4文件夹移动到Linux下。

我的ffmpeg路径
/home/zhangyu/ffmpeg/ffmpeg-4.1.4

我的ndk路径
/home/zhangyu/ffmpeg/android-ndk-r14b

我这里一次性给了整个目录读写权限
chmod -R 777 ffmpeg-4.1.4

然后执行
./configure

因为脚本在Windows上编辑的，所以格式是dos，需要改成unix
vim build.sh
:set ff=unix
:wq

执行编译脚本
./build.sh

执行脚本报错

libavformat/udp.c: In function 'udp_set_multicast_sources':
libavformat/udp.c:290:28: error: request for member 's_addr' in something not a structure or union
         mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
                            ^
libavformat/udp.c:292:32: error: incompatible types when assigning to type '__be32' from type 'struct in_addr'
             mreqs.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
                                ^
libavformat/udp.c:294:32: error: request for member 's_addr' in something not a structure or union
             mreqs.imr_interface.s_addr= INADDR_ANY;
                                ^
libavformat/udp.c:295:29: error: request for member 's_addr' in something not a structure or union
         mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)&sources[i])->sin_addr.s_addr;
                             ^
ffbuild/common.mak:60: recipe for target 'libavformat/udp.o' failed
make: *** [libavformat/udp.o] Error 1
+ make install
CC	libavformat/udp.o

这里的解决办法是注释掉报错的代码段 290——295行

libavformat/udp.c

        //mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
        //if (local_addr)
            //mreqs.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
        //else
            //mreqs.imr_interface.s_addr= INADDR_ANY;
        //mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)&sources[i])->sin_addr.s_addr;

然后重新编译即可

编译成功后，会有Android目录