使用 x264 为 Android 构建 FFMPEG [英] Build FFMPEG with x264 for Android
问题描述
我正在尝试使用 libx264 for Android 构建 FFMPEG.
I am trying to build FFMPEG with libx264 for Android.
我可以成功构建和使用适用于 Android 的 FFMPEG，但我意识到我需要编码能力，因此我正在尝试使用 x264 构建 FFMPEG.
I can successfully build and use FFMPEG for Android but I realized that I need the ability to encode, therefore I am trying to build FFMPEG with x264.
我正在使用本教程为 Android 构建 FFmpeg http://www.roman10.net/how-to-build-ffmpeg-for-android/
I am using this tutorial to build FFmpeg for Android http://www.roman10.net/how-to-build-ffmpeg-for-android/
在尝试构建 FFMPEG 时出现错误:
When trying to build FFMPEG I get an error:
错误:找不到 libx264"
"ERROR: libx264 not found"
在我的日志中它说:
"/usr/local/lib/libx264.a:无法读取符号:存档没有指数;运行ranlib添加一个..."
"/usr/local/lib/libx264.a: could not read symbols: Archive has no index; run ranlib to add one..."
我有最新版本的 FFMPEG 和 x264.我知道 FFMPEG 在 usr/lib 和 usr/include 中寻找头文件和库，所以为了让它找到 x264，我使用了 cflags 和 ldflags:
I have the latest versions of both FFMPEG and x264. I understand that FFMPEG looks for the header and libraries in usr/lib and usr/include, so in order to make it find x264 I use the cflags and ldflags:
- --extra-cflags = " -I/usr/local/include "
- --extra-ldflags = "-L/usr/local/lib"
我尝试使用互联网上其他人说我需要的许多不同选项来构建 x264.例如.--enable-shared、--enable-static、--disable-pthreads 等.有的论坛说启用这个，其他的说不禁用那个.
I have tried building x264 with many different options that other people on the internet have said that i need. eg. --enable-shared, --enable-static, --disable-pthreads etc. Some forums say enable this, others say no disable that.
任何帮助将不胜感激，谢谢
Any help would be much appreciated, Thanks
如果我使用包含 libx264 的最简单命令构建 FFmpeg，那么它可以工作.即.
If I build FFmpeg with the simplest commands to include libx264 then it works. ie.
./configure --enable-gpl --enable-libx264 --extra-cflags="-I/usr/local/include" --extra-ldflags="-L/usr/local/lib" --enable-static --enable-shared
但是我需要它才能在 Android 上工作.我使用的脚本是:
However I need it to work for Android. The script I am using is:
NDK=~/Desktop/android-ndk-r7
PLATFORM=$NDK/platforms/android-8/arch-arm/
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86
function build_one
{
./configure --target-os=linux
--prefix=$PREFIX
--enable-cross-compile
--enable-shared
--enable-static
--extra-libs="-lgcc"
--arch=arm
--cc=$PREBUILT/bin/arm-linux-androideabi-gcc
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi-
--nm=$PREBUILT/bin/arm-linux-androideabi-nm
--sysroot=$PLATFORM
--extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS -I/usr/local/include"
--extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L $PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog -L/usr/local/lib "
--enable-gpl
--enable-libx264
--disable-everything
--enable-demuxer=mov
--enable-demuxer=h264
--disable-ffplay
--enable-protocol=file
--enable-avformat
--enable-avcodec
--enable-decoder=rawvideo
--enable-decoder=mjpeg
--enable-decoder=h263
--enable-decoder=mpeg4
--enable-decoder=h264
--enable-encoder=mjpeg
--enable-encoder=h263
--enable-encoder=mpeg4
--enable-encoder=h264
--enable-parser=h264
--disable-network
--enable-zlib
--disable-avfilter
--disable-avdevice
$ADDITIONAL_CONFIGURE_FLAG
make clean
make -j4 install
$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -soname libffmpeg.so -shared -nostdlib -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
}
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
build_one
我猜我的配置命令中的某些选项与启用 libx264 冲突
I am guessing that some option in my configure command is conflicting with enabling libx264
注意:如果我删除 --enable-libx264 那么它可以工作
NOTE: If I remove --enable-libx264 then it works
推荐答案
ffmpeg源码好像更新了，我可以用x264编译ffmpeg for Android NDK如下.
The ffmpeg source code seems to be updated, and I could compile ffmpeg with x264 for Android NDK as the following.
1 从 https://github.com/下载 halfninja 的 android-ffmpeg-x264 git 文件halfninja/android-ffmpeg-x264
2 在halfninja-android-ffmpeg-x264-fe12be0/Project/jni"目录下，修改configure_ffmpeg.sh"链接libgcc.a"，解决__aeabi_f2uiz"无法解决的问题.
2 At "halfninja-android-ffmpeg-x264-fe12be0/Project/jni" directory, modify "configure_ffmpeg.sh" to link "libgcc.a" for solving a problem that can not resolve "__aeabi_f2uiz".
./configure $DEBUG_FLAG --enable-cross-compile
--arch=arm5te
--enable-armv5te
--target-os=linux
--disable-stripping
--prefix=../output
--disable-neon
--enable-version3
--disable-shared
--enable-static
--enable-gpl
--enable-memalign-hack
--cc=arm-linux-androideabi-gcc
--ld=arm-linux-androideabi-ld
--extra-cflags="-fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -I../x264 -Ivideokit"
$featureflags
--disable-ffmpeg
--disable-ffplay
--disable-ffprobe
--disable-ffserver
--disable-network
--enable-filter=buffer
--enable-filter=buffersink
--disable-demuxer=v4l
--disable-demuxer=v4l2
--disable-indev=v4l
--disable-indev=v4l2
--extra-ldflags="-L../x264 -L../toolchain/lib/gcc/arm-linux-androideabi/4.4.3"
--extra-libs="-lgcc"
3 修改Android.mk"以链接新库libswresample.a".
3 Modify "Android.mk" to link new library "libswresample.a".
FFMPEG_LIBS := $(addprefix ffmpeg/,
libavdevice/libavdevice.a
libavformat/libavformat.a
libavcodec/libavcodec.a
libavfilter/libavfilter.a
libswscale/libswscale.a
libavutil/libavutil.a
libswresample/libswresample.a
libpostproc/libpostproc.a )
4 将videokit目录下的ffmpeg.c和cmdutils.c替换成ffmpeg目录下的.
4 Replace ffmpeg.c and cmdutils.c in videokit directory with ones in ffmpeg directory.
5 遵循 README.textile 中描述的程序.
5 Follow a procedure described in README.textile.
这篇关于使用 x264 为 Android 构建 FFMPEG的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
