Ubuntu 编译ffmpeg 踩坑(三)

编译Android下可以使用的ffmpeg

参照视频操作：https://coding.imooc.com/lesson/279.html#mid=37236

其他流程都没有什么问题其中有几个问题我记录一下

1.ERROR: Failed to create toolchain.

 解决方案：
apt-get install python
安装python后再执行编译即可解决ERROR: Failed to create toolchain.问题

 2.编译中遇到 make: *** [ffbuild/common.mak:60: libavdevice/v4l2.o] Error 1

CC
libavdevice/v4l2.o
libavdevice/v4l2.c:135:9: error: assigning to 'int (*)(int, unsigned long, ...)' from incompatible type '<overloaded function type>'
SET_WRAPPERS();
^~~~~~~~~~~~~~
libavdevice/v4l2.c:121:17: note: expanded from macro 'SET_WRAPPERS'
s->ioctl_f
= prefix ## ioctl;

^
~~~~~
/home/cc/android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/include/bits/ioctl.h:56:5: note: candidate function has type mismatch at 2nd parameter
(expected 'unsigned long' but has 'unsigned int')
int ioctl(int __fd, unsigned __request, ...) __overloadable __enable_if(1, "") __RENAME(ioctl);
^
/home/cc/android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/include/bits/ioctl.h:36:5: note: candidate function has type mismatch at 2nd parameter
(expected 'unsigned long' but has 'int')
int ioctl(int __fd, int __request, ...);
^
1 error generated.
make: *** [ffbuild/common.mak:60: libavdevice/v4l2.o] Error 1

 解决方案：

在编译脚本中添加了宏：BIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD

 完整代码段：

#!/bin/bash
#在ffmpeg目录下执行该脚本，输出在ffmpeg目录下的android-build 目录里
PREFIX=./android-build
#设置你自己的NDK位置
#NDK_HOME=/Users/lichao/Downloads/ndk21
NDK_HOME=/home/fly/Downloads/ndk21
COMMON_OPTIONS="
--target-os=android 
--disable-static 
--enable-shared 
--enable-small 
--disable-programs 
--disable-ffmpeg 
--disable-ffplay 
--disable-ffprobe 
--disable-doc 
--disable-symver 
--disable-asm 
"
function build_android {
./configure 
--libdir=${PREFIX}/libs/armeabi-v7a 
--incdir=${PREFIX}/includes/armeabi-v7a 
--pkgconfigdir=${PREFIX}/pkgconfig/armeabi-v7a 
--arch=arm 
--cpu=armv7-a 
--cross-prefix="${NDK_HOME}/bin/arm-linux-androideabi-" 
--sysroot="${NDK_HOME}/sysroot/" 
--extra-ldexeflags=-pie 
--extra-cflags="-Os -fpic -DBIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD" 
${COMMON_OPTIONS}
make clean
make -j8 && make install
./configure 
--libdir=${PREFIX}/libs/arm64-v8a 
--incdir=${PREFIX}/includes/arm64-v8a 
--pkgconfigdir=${PREFIX}/pkgconfig/arm64-v8a 
--arch=aarch64 
--cpu=armv8-a 
--cross-prefix="${NDK_HOME}/bin/aarch64-linux-android-" 
--sysroot="${NDK_HOME}/sysroot/" 
--extra-ldexeflags=-pie 
--extra-cflags="-Os -fpic -DBIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD" 
${COMMON_OPTIONS}
make clean
make -j8 && make install
./configure 
--libdir=${PREFIX}/libs/x86 
--incdir=${PREFIX}/includes/x86 
--pkgconfigdir=${PREFIX}/pkgconfig/x86 
--arch=x86 
--cpu=i686 
--cross-prefix="${NDK_HOME}/bin/i686-linux-android-" 
--sysroot="${NDK_HOME}/sysroot/" 
--extra-ldexeflags=-pie 
--extra-cflags="-Os -fpic -DBIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD" 
${COMMON_OPTIONS}
make clean
make -j8 && make install
./configure 
--libdir=${PREFIX}/libs/x86_64 
--incdir=${PREFIX}/includes/x86_64 
--pkgconfigdir=${PREFIX}/pkgconfig/x86_64 
--arch=x86_64 
--cpu=x86_64 
--cross-prefix="${NDK_HOME}/bin/x86_64-linux-android-" 
--sysroot="${NDK_HOME}/sysroot/" 
--extra-ldexeflags=-pie 
--extra-cflags="-Os -fpic -DBIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD" 
${COMMON_OPTIONS}
make clean
make -j8 && make install
};
build_android

 这里特别注意：在执行./build_ffmpeg_for_android1.sh的时候会报没有权限

解决方案：给予执行权限就可以

chmod 755 ./build_ffmpeg_for_android1.sh
./build_ffmpeg_for_android1.sh

我的电脑等待20分钟左右 终于编译完成：

root@ubuntu:/home/fly/FFmpeg/ffmpeg# ls
android-build
COPYING.GPLv3
libavfilter
presets
build_ffmpeg_for_android1.sh
COPYING.LGPLv2.1
libavformat
README.md
build_ffmpeg_for_android.sh
COPYING.LGPLv3
libavresample
RELEASE
Changelog
CREDITS
libavutil
RELEASE_NOTES
compat
doc
libpostproc
tests
config.asm
ffbuild
libswresample
tools
config.h
fftools
libswscale
VERSION
configure
INSTALL.md
LICENSE.md
CONTRIBUTING.md
libavcodec
MAINTAINERS
COPYING.GPLv2
libavdevice
Makefile
root@ubuntu:/home/fly/FFmpeg/ffmpeg# cd .android-build
bash: cd: .android-build: No such file or directory
root@ubuntu:/home/fly/FFmpeg/ffmpeg# cd ./android-build
root@ubuntu:/home/fly/FFmpeg/ffmpeg/android-build# ls
includes
libs
pkgconfig
root@ubuntu:/home/fly/FFmpeg/ffmpeg/android-build# cd ./libs
root@ubuntu:/home/fly/FFmpeg/ffmpeg/android-build/libs# ls
armeabi-v7a
root@ubuntu:/home/fly/FFmpeg/ffmpeg/android-build/libs# cd ./armeabi-v7a
root@ubuntu:/home/fly/FFmpeg/ffmpeg/android-build/libs/armeabi-v7a# ls
libavcodec.so
libavfilter.so
libavutil.so
libswscale.so
libavdevice.so
libavformat.so
libswresample.so

最后

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