ndk ffmpeg实践2_mb5ff2f24b42377的技术博客_

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1、现在开始f fmpeg的--

库移到 /armeabi-v7a 后报这个错

2 files found with path 'lib/armeabi-v7a/libavcodec.so' from inputs:

cmakefile.txt里用这两行替代

set(FF ${CMAKE_SOURCE_DIR}/../../../libs/armeabi-v7a/)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -L${FF}")

这样可以编出 apk了，但是运行还出错，报这个
java.lang.UnsatisfiedLinkError: dlopen failed: library "libnativeffmpeg.so" not found，工程库找不到，奇怪。


2 现在用

arm64-v8a的，因为怀疑是虚拟机是arm64-v8a的，所以自动找arm64-v8a的库，没有就报错

但是现在链接有问提

Build command failed.
Error while executing process /Users/wangt/Library/Android/sdk/cmake/3.10.2.4988404/bin/ninja with arguments {-C /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/.cxx/Debug/6m17615i/arm64-v8a nativeffmpeg}
ninja: Entering directory `/Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/.cxx/Debug/6m17615i/arm64-v8a'
[1/1] Linking CXX shared library /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/build/intermediates/cxx/Debug/6m17615i/obj/arm64-v8a/libnativeffmpeg.so
FAILED: /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/build/intermediates/cxx/Debug/6m17615i/obj/arm64-v8a/libnativeffmpeg.so 
: && /Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ --target=aarch64-none-linux-android21 --gcc-toolchain=/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64 --sysroot=/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security   -L/Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a/ -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments -shared -Wl,-soname,libnativeffmpeg.so -o /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/build/intermediates/cxx/Debug/6m17615i/obj/arm64-v8a/libnativeffmpeg.so CMakeFiles/nativeffmpeg.dir/native-lib.cpp.o  -lavfilter -lavcodec -lavformat -lavutil -lpostproc -lswresample -lswscale -llog -latomic -lm && :
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libavfilter.so when searching for -lavfilter
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lavfilter
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libavcodec.so when searching for -lavcodec
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lavcodec
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libavformat.so when searching for -lavformat
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lavformat
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libavutil.so when searching for -lavutil
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lavutil
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libpostproc.so when searching for -lpostproc
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lpostproc
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libswresample.so when searching for -lswresample
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lswresample
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: skipping incompatible /Users/wangt/AndroidStudioProjects/NativeFfmpeg/app/src/main/cpp/../../../libs/arm64-v8a//libswscale.so when searching for -lswscale
/Users/wangt/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lswscale
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

3看来还是和库编译有关

is unable to create an executable file. C compiler test failed.

经常出现这个，观察了下，这个改成带版本的，因为有aarch64-linux-android21-clang程序

--cross-prefix=$TOOLCHAIN/bin/aarch64-linux-android21- \

但是又报nm的，于是

--nm=$TOOLCHAIN/bin/aarch64-linux-android-nm \

拷贝过去OK了，最终版

!/bin/bash
make clean
# NDK的路径，根据自己的安装位置进行设置
export NDK=/Users/wangt/Library/Android/sdk/ndk/21.4.7075529
export SYSROOT=$NDK/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/darwin-x86_64/
export CPU=arm
export ADDI_CFLAGS="-marm"
export PREFIX=$(pwd)/android/
COMMON_OPTIONS="\
    --prefix=android/ \
    --target-os=android \
    --enable-shared \
    --enable-runtime-cpudetect \
    --enable-small \
    --disable-static \
    --disable-debug \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-ffprobe \
    --disable-doc \
    --disable-symver \
    --disable-asm \
    --disable-stripping \
    --disable-armv5te \
    function build_android {
    echo "开始编译FFmpeg..."
    # arm64-v8a
    echo "开始编译FFmpeg(arm64-v8a)"
    ./configure \
    --libdir=${PREFIX}/libs/arm64-v8a \
    --incdir=${PREFIX}/include/arm64-v8a \
    --pkgconfigdir=${PREFIX}/pkgconfig/arm64-v8a \
    --arch=aarch64 \
    --cpu=armv8-a \
    --cross-prefix=$TOOLCHAIN/bin/aarch64-linux-android21- \
    --nm=$TOOLCHAIN/bin/aarch64-linux-android-nm \
    --sysroot=$SYSROOT \
    --extra-ldexeflags=-pie \
    ${COMMON_OPTIONS}
    make clean
    make -j8 && make install
    echo "结束编译FFmpeg(arm64-v8a)"
    echo "编译结束"
build_android