如何生成最新片本的ffmpeg.so静态库克用于安卓开发，过程..

javaplus

网上下载了一个libffmpeg.so, 给视频加水印，生成的MPEG4无法播放，MPEG1可以，不过播放太快了。今天准备自己编译静态库搞了一下午，cygwin+ffmpeg源代码，make就一大堆错误。过路师兄弟给个有效的build教程，能支持H.264编解码的ffmpeg静态库。非常感谢！

javaplus

cygwin + NDK r9d + ffmpeg3.1.2 搞了一天，一堆错误

javaplus

export NDK=/cygdrive/d/android/android-ndk-r9d
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt
export PLATFORM=$NDK/platforms/android-8/arch-arm
export PREFIX=../simplefflib
export TMPDIR=/cygdrive/d/temp
build_one(){
  ./configure --target-os=linux --prefix=$PREFIX \
--enable-cross-compile \
--enable-runtime-cpudetect \
--disable-asm \
--arch=arm \
--cc=$PREBUILT/linux-x86/bin/arm-linux-androideabi-gcc \
--cross-prefix=$PREBUILT/linux-x86/bin/arm-linux-androideabi- \
--disable-stripping \
--nm=$PREBUILT/linux-x86/bin/arm-linux-androideabi-nm \
--sysroot=$PLATFORM \
--enable-gpl --enable-shared --disable-static --enable-small \
--disable-ffprobe --disable-ffplay --disable-ffmpeg --disable-ffserver --disable-debug \
--extra-cflags="-fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -marm -march=armv7-a"
}

build_one
  
make
make install

javaplus

WARNING: /cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
mktemp -u XXXXXX
uS7nna
WARNING: Unknown C compiler /cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc, unable to select optimal CFLAGS
check_cpp_condition stddef.h defined __ARM_ARCH_4__ || defined __TARGET_ARCH_4
check_cpp
BEGIN /cygdrive/d/temp/ffconf.ICGTacCo.c
    1        #include <stddef.h>
    2        #if !(defined __ARM_ARCH_4__ || defined __TARGET_ARCH_4)
    3        #error "unsatisfied condition: defined __ARM_ARCH_4__ || defined __TARGET_ARCH_4"
    4        #endif
END /cygdrive/d/temp/ffconf.ICGTacCo.c
/cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -marm -march=armv7-a -E -o /cygdrive/d/temp/ffconf.qlpu5y2i.o /cygdrive/d/temp/ffconf.ICGTacCo.c
./configure: line 875: /cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc: cannot execute binary file: Exec format error
check_cpp_condition stddef.h defined __ARM_ARCH_4T__ || defined __TARGET_ARCH_4T
check_cpp
BEGIN /cygdrive/d/temp/ffconf.ICGTacCo.c
    1        #include <stddef.h>
    2        #if !(defined __ARM_ARCH_4T__ || defined __TARGET_ARCH_4T)
    3        #error "unsatisfied condition: defined __ARM_ARCH_4T__ || defined __TARGET_ARCH_4T"
    4        #endif
END /cygdrive/d/temp/ffconf.ICGTacCo.c
/cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -marm -march=armv7-a -E -o /cygdrive/d/temp/ffconf.qlpu5y2i.o /cygdrive/d/temp/ffconf.ICGTacCo.c
./configure: line 875: /cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc: cannot execute binary file: Exec format error
check_cpp_condition stddef.h defined __ARM_ARCH_5__ || defined __TARGET_ARCH_5
check_cpp
BEGIN /cygdrive/d/temp/ffconf.ICGTacCo.c
    1        #include <stddef.h>
    2        #if !(defined __ARM_ARCH_5__ || defined __TARGET_ARCH_5)
    3        #error "unsatisfied condition: defined __ARM_ARCH_5__ || defined __TARGET_ARCH_5"
    4        #endif
END /cygdrive/d/temp/ffconf.ICGTacCo.c
/cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -marm -march=armv7-a -E -o /cygdrive/d/temp/ffconf.qlpu5y2i.o /cygdrive/d/temp/ffconf.ICGTacCo.c
./configure: line 875: /cygdrive/d/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc: cannot execute binary file: Exec format error
下面错误类似

T-Bagwell

交叉编译工具链错误

javaplus

@T-Bagwell非常感谢！NDK最新是不是R12？ 那位大哥给个linux-X86云盘，不会翻墙啊