Android - 集成 ffmpeg 和 android-ndk-r9c

Question

我看过很多关于 FFmpeg 和在 Android 中使用 FFmpeg 的帖子，但我发现这些帖子中的大多数都是针对旧版本的 FFmpeg 或 Android NDK。我能够从https://github.com/mconf/android-ffmpeg 获得结果，其中包括文件：“libavcodec.so”、“libavformat.so”、“libavutil.so”、“libswscale.so”。但是，仅仅将这些文件添加到我的项目中似乎不足以使用 FFmpeg。 （我遵循https://stackoverflow.com/a/21773572/1877798 作为参考指南）。可能是我在项目中配置这些文件时做错了，或者我在为 Android 构建 FFmpeg 时做错了。 （应该有更多文件吗？）

我想知道最近是否有任何关于在 Android 项目中构建或集成 FFmpeg 的指南。我正在使用 FFmpeg（截至 2014 年 2 月 27 日）和 Android NDK 9c。 如果没有，是否有人对其他图书馆有其他建议？我正在尝试获取一组图像文件并以编程方式创建视频/动画 gif。

谢谢！ :-)

~~编辑~~

我在 GitHub 上找到了 http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/comment-page-4/ 和其他几个。然而，他们似乎都在努力构建 FFmpeg。我正在使用 Mac OS X

这是我的脚本：

#!/bin/bash
NDK=/Downloads/android-ndk-r9c
SYSROOT=$NDK/platforms/android-18/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64
# Note: Change the TOOLCHAIN to match that available for your host system.
# darwin-x86_64 is for Mac OS X, but you knew that.
function build_one
{
./configure \
    --prefix=$PREFIX \
    --enable-shared \
    --disable-static \
    --disable-doc \
    --disable-programs \
    --disable-doc \
    --disable-symver \
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    --target-os=linux \
    --arch=arm \
    --enable-cross-compile \
    --sysroot=$SYSROOT \
    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
    --extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
}
CPU=arm
PREFIX=$(pwd)/android/$CPU 
ADDI_CFLAGS="-marm"
build_one

这是日志：

Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-        dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
/Downloads/android-ndk-r9c/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc is unable to create an executable file.
C compiler test failed.

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solving the problem.
Makefile:2: config.mak: No such file or directory
Makefile:48: /common.mak: No such file or directory
Makefile:91: /libavutil/Makefile: No such file or directory
Makefile:91: /library.mak: No such file or directory
Makefile:168: /doc/Makefile: No such file or directory
Makefile:169: /tests/Makefile: No such file or directory
make: *** No rule to make target `/tests/Makefile'.  Stop.
Makefile:2: config.mak: No such file or directory
Makefile:48: /common.mak: No such file or directory
Makefile:91: /libavutil/Makefile: No such file or directory
Makefile:91: /library.mak: No such file or directory
Makefile:168: /doc/Makefile: No such file or directory
Makefile:169: /tests/Makefile: No such file or directory
make: *** No rule to make target `/tests/Makefile'.  Stop.
Makefile:2: config.mak: No such file or directory
Makefile:48: /common.mak: No such file or directory
Makefile:91: /libavutil/Makefile: No such file or directory
Makefile:91: /library.mak: No such file or directory
Makefile:168: /doc/Makefile: No such file or directory
Makefile:169: /tests/Makefile: No such file or directory
make: *** No rule to make target `/tests/Makefile'.  Stop.

Answer 1

试试我目前用过最好的这个：https://github.com/bbcallen/ijkplayer

Answer 2

我也有同样的错误。

"Makefile:2: config.mak: 没有这样的文件或目录 Makefile:48: /common.mak: 没有这样的文件或目录 Makefile:91: /libavutil/Makefile: 没有这样的文件或目录 Makefile:91: /library.mak: 没有这样的文件或目录 Makefile:168: /doc/Makefile: 没有这样的文件或目录 Makefile:169: /tests/Makefile: 没有这样的文件或目录 make: *** 没有规则来制作目标`/tests/Makefile'。停下来。”

请检查脚本中的目录路径是否正确。即：'/Downloads/android-ndk-r9c/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/"

我认为它实际上是“$HOME/Downloads”

还要确保您在“.../android-ndk-r9c/sources/FFMPEG/”目录中运行脚本。

Answer 3

您需要修复不正确的 NDK 路径。 可能是：NDK=/user//Downloads/android-ndk-r9c

你想在浏览器中签入：

file:///user/xyz/Downloads/android-ndk-r9c

如果有效，则打开“android-ndk-r9c”文件夹。当你成功后，将它放在你的 NDK 路径上并构建。

Answer 4

我在 mac os x 中使用带有 ffmpeg 2.7.1 和 yasm 1.2.0（全部在下载文件夹中）的 android ndk r10e

#!/bin/bash
# Usage:
# put this script in top of FFmpeg source tree
# ./build_android
# It generates binary for following architectures:
# ARMv6
# ARMv6+VFP
# ARMv7+VFPv3-d16 (Tegra2)
# ARMv7+Neon (Cortex-A8)
# set $CPU and $OPTIMIZE_CFLAGS
# call build_one

NDK=$Users/samavesh/Downloads/android-ndk-r10e
SYSROOT=$NDK/platforms/android-9/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64

function build_one
{
./configure --target-os=linux \
--prefix=$PREFIX \
--enable-cross-compile \
--extra-libs="-lgcc" \
--arch=arm \
--cc=$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     $OPTIMIZE_CFLAGS " \
--disable-shared \
--enable-static \
--extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -    nostdlib -lc -lm -ldl -llog" \
--enable-parsers \
--enable-encoders  \
--enable-decoders \
--disable-muxers \
--enable-demuxers \
--enable-swscale  \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--enable-network \
--enable-indevs \
--disable-bsfs \
--enable-filters \
--enable-protocols  \
--enable-asm \
$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 \
-Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so \
libavcodec/libavcodec.a libavdevice/libavdevice.a libavfilter/libavfilter.a \
libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a \
libswresample/libswresample.a -lc -lm -lz -ldl -llog \
--dynamic-linker=/system/bin/linker \
$PREBUILT/lib/gcc/arm-linux-androideabi/4.8/libgcc.a
}

#arm v6 ¹öÀü ÄÄÆÄÀÏ
CPU=armv6
OPTIMIZE_CFLAGS="-marm -march=$CPU"
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
#build_one

#arm v7vfpv3 ¹öÀü ÄÄÆÄÀÏ
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
#build_one

#arm v7vfp ¹öÀü ÄÄÆÄÀÏ
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
PREFIX=./android/$CPU-vfp
ADDITIONAL_CONFIGURE_FLAG=
build_one

#arm v7n ¹öÀü ÄÄÆÄÀÏ
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=--enable-neon
#build_one

#arm v6+vfp ¹öÀü ÄÄÆÄÀÏ
CPU=armv6
OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU"
PREFIX=./android/${CPU}_vfp
ADDITIONAL_CONFIGURE_FLAG=
#build_one