使用x264 for Android构建FFMPEG

本文介绍了使用x264 for Android构建FFMPEG的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试使用libx264为Android构建FFMPEG。

我可以成功构建和使用FFMPEG for Android，但我意识到我需要编码的能力，因此我正在尝试用x264构建FFMPEG。

我正在使用本教程为Android构建FFmpeg

当尝试构建FFMPEG时，我收到一个错误：

在我的日志中，它说：

我有最新版本的FFMPEG和x264。
我明白，FFMPEG在usr / lib和usr / include中查找标题和库，所以为了找到x264，我使用cflags和ldflags：

- extra-cflags =-I / usr / local / include

- extra-ldflags =-L / usr / local / lib

我已经尝试使用许多不同的选项构建x264，互联网上的其他人都说我需要。例如。 --enable-shared，--enable-static，--disable-pthreads等
一些论坛说启用这个，其他人说没有禁用。

任何帮助将不胜感激，
感谢

编辑：

如果我用最简单的命令构建FFmpeg以包含libx264，那么它可以工作。
ie。

  ./configure --enable-gpl --enable-libx264 --extra-cflags = -I / usr / local / include--extra-ldflags = -  L / usr / local / lib--enable-static --enable-shared

但是我需要它适用于Android。我使用的脚本是：

  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 / u sr / 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 reverse.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

有冲突注意：如果我删除了--enable-libx264，那么它的工作原理

解决方案

ffmpeg源代码似乎更新了，我可以用x编译ffmpeg 264的Android NDK如下所示。

1从

2在halfninja -android-ffmpeg-x264-fe12be0 / Project / jni目录，修改configure_ffmpeg.sh以链接libgcc.a来解决无法解决__aeabi_f2uiz的问题。

  ./ 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 -Waatal-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链接新库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 / li bpostproc.a）

4将ffmpeg.c和cmdutils.c替换为videokit目录中的ffmpeg目录。

5按照README.textile中所述的步骤。

I am trying to build FFMPEG with libx264 for Android.

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.

I am using this tutorial to build FFmpeg for Android http://www.roman10.net/how-to-build-ffmpeg-for-android/

When trying to build FFMPEG I get an error:

And in my log it says:

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 "

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.

Any help would be much appreciated,Thanks

EDIT:

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

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

I am guessing that some option in my configure command is conflicting with enabling libx264

NOTE: If I remove --enable-libx264 then it works

解决方案

The ffmpeg source code seems to be updated, and I could compile ffmpeg with x264 for Android NDK as the following.

1 Download the halfninja's android-ffmpeg-x264 git file from https://github.com/halfninja/android-ffmpeg-x264

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 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 Replace ffmpeg.c and cmdutils.c in videokit directory with ones in ffmpeg directory.

5 Follow a procedure described in README.textile.

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