iPhone SDK 4.3 的 libav 编译问题

Question

iPhone SDK 4.3 的 libav 编译问题

9

我遇到了一个奇怪的问题。我安装了iPhone SDK 4.3和xCode 4，现在我无法为ARMv6架构编译来自ffmpeg的libav。这是我的编译脚本（它适用于iPhone SDK 4.2）：

./configure \
--disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-cross-compile \
--enable-encoder=rawvideo \
--enable-decoder=h264 \
--enable-decoder=mpeg4 \
--enable-encoder=mjpeg \
--enable-muxer=rawvideo \
--enable-demuxer=h264 \
--enable-parser=h264 \
--enable-cross-compile \
--arch=c \
--target-os=darwin \
--enable-libopencore-amrnb --enable-libopencore-amrwb \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 \
--as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer    /usr/bin/arm-apple-darwin10-gcc-4.2.1' \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
--cpu=arm1176jzf-s --extra-cflags='-arch armv6' --extra-ldflags='-arch armv6'

make clean
make

作为结果，我得到了库文件，但是当我用lipo -info命令检查时，它显示该库是为i386架构编译的。也许有人遇到了这样的问题？请帮帮我。谢谢。

- VictorT

有人在iOS SDK 4.3下编译ffmpeg遇到了问题吗？ - VictorT

1个回答

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- Anton · Accepted Answer

更新的内容

这是一个最新的脚本，它移除了armv6，增加了armv7s，使用iOS 6.0 SDK，并修复了与工具更改相关的问题。请确保你在/usr/local/bin中拥有来自github的最新的gas-preprocessor.pl：

rm -r ./compiled

# configure for armv7 build
./configure \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/system \
--target-os=darwin \
--arch=arm \
--cpu=cortex-a8 \
--extra-cflags='-arch armv7' \
--extra-ldflags='-arch armv7' \
--extra-cflags='-mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad' \
--prefix=compiled/armv7 \
--enable-pic \
--enable-neon \
--enable-cross-compile \
--enable-optimizations \
--disable-debug \
--disable-armv5te \
--disable-armv6 \
--disable-armv6t2 \
--disable-armvfp \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-ffprobe \
--disable-doc

# build for armv7
make clean
make && make install

# configure for armv7s build
./configure \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/system \
--target-os=darwin \
--arch=arm \
--cpu=cortex-a8 \
--extra-cflags='-arch armv7s' \
--extra-ldflags='-arch armv7s' \
--extra-cflags='-mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad' \
--prefix=compiled/armv7s \
--enable-pic \
--enable-neon \
--enable-cross-compile \
--enable-optimizations \
--disable-debug \
--disable-armv5te \
--disable-armv6 \
--disable-armv6t2 \
--disable-armvfp \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-ffprobe \
--disable-doc

# build for armv7s
make clean
make && make install

# configure for i386 build
./configure \
--cc=/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor.pl /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk \
--extra-ldflags=-L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/usr/lib/system \
--target-os=darwin \
--arch=i386 \
--cpu=i386 \
--extra-cflags='-arch i386' \
--extra-ldflags='-arch i386' \
--prefix=compiled/i386 \
--enable-cross-compile \
--disable-mmx \
--disable-armv5te \
--disable-armv6 \
--disable-armv6t2 \
--disable-armvfp \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-ffprobe \
--disable-doc

# build for i386
make clean
make && make install

# make fat (universal) libs
mkdir -p ./compiled/fat/lib

lipo -output ./compiled/fat/lib/libavcodec.a  -create \
./compiled/armv7s/lib/libavcodec.a \
./compiled/armv7/lib/libavcodec.a \
./compiled/i386/lib/libavcodec.a

lipo -output ./compiled/fat/lib/libavdevice.a  -create \
./compiled/armv7s/lib/libavdevice.a \
./compiled/armv7/lib/libavdevice.a \
./compiled/i386/lib/libavdevice.a

lipo -output ./compiled/fat/lib/libavfilter.a  -create \
./compiled/armv7s/lib/libavfilter.a \
./compiled/armv7/lib/libavfilter.a \
./compiled/i386/lib/libavfilter.a

lipo -output ./compiled/fat/lib/libavformat.a  -create \
./compiled/armv7s/lib/libavformat.a \
./compiled/armv7/lib/libavformat.a \
./compiled/i386/lib/libavformat.a

lipo -output ./compiled/fat/lib/libavutil.a  -create \
./compiled/armv7s/lib/libavutil.a \
./compiled/armv7/lib/libavutil.a \
./compiled/i386/lib/libavutil.a

lipo -output ./compiled/fat/lib/libswresample.a  -create \
./compiled/armv7s/lib/libswresample.a \
./compiled/armv7/lib/libswresample.a \
./compiled/i386/lib/libswresample.a

lipo -output ./compiled/fat/lib/libswscale.a  -create \
./compiled/armv7s/lib/libswscale.a \
./compiled/armv7/lib/libswscale.a \
./compiled/i386/lib/libswscale.a

该命令将为armv6、armv7和i386架构构建ffmpeg静态库，并将它们合并成iOS 4.3（iPhoneOS4.3和iPhoneSimulator4.3）通用的fat文件。

rm -r ./compiled

# configure for armv7 build
./configure \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system \
--target-os=darwin \
--arch=arm \
--cpu=cortex-a8 \
--extra-cflags='-arch armv7' \
--extra-ldflags='-arch armv7' \
--prefix=compiled/armv7 \
--enable-pic \
--enable-cross-compile \
--disable-armv5te \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-ffprobe \
--disable-doc

# build for armv7
make clean
make && make install

# configure for armv6 build
./configure \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system \
--target-os=darwin \
--arch=arm \
--cpu=arm1176jzf-s \
--extra-cflags='-arch armv6' \
--extra-ldflags='-arch armv6' \
--prefix=compiled/armv6 \
--enable-cross-compile \
--disable-armv5te \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-ffprobe \
--disable-doc

# build for armv6
make clean
make && make install

# configure for i386 build
./configure \
--cc=/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor.pl /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk \
--extra-ldflags=-L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/usr/lib/system \
--target-os=darwin \
--arch=i386 \
--cpu=i386 \
--extra-cflags='-arch i386' \
--extra-ldflags='-arch i386' \
--prefix=compiled/i386 \
--enable-cross-compile \
--disable-armv5te \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-ffprobe \
--disable-doc

# build for i386
make clean
make && make install

# make fat (universal) libs
mkdir -p ./compiled/fat/lib

lipo -output ./compiled/fat/lib/libavcodec.a  -create \
-arch armv6 ./compiled/armv6/lib/libavcodec.a \
-arch armv7 ./compiled/armv7/lib/libavcodec.a \
-arch i386 ./compiled/i386/lib/libavcodec.a

lipo -output ./compiled/fat/lib/libavdevice.a  -create \
-arch armv6 ./compiled/armv6/lib/libavdevice.a \
-arch armv7 ./compiled/armv7/lib/libavdevice.a \
-arch i386 ./compiled/i386/lib/libavdevice.a

lipo -output ./compiled/fat/lib/libavfilter.a  -create \
-arch armv6 ./compiled/armv6/lib/libavfilter.a \
-arch armv7 ./compiled/armv7/lib/libavfilter.a \
-arch i386 ./compiled/i386/lib/libavfilter.a

lipo -output ./compiled/fat/lib/libavformat.a  -create \
-arch armv6 ./compiled/armv6/lib/libavformat.a \
-arch armv7 ./compiled/armv7/lib/libavformat.a \
-arch i386 ./compiled/i386/lib/libavformat.a

lipo -output ./compiled/fat/lib/libavutil.a  -create \
-arch armv6 ./compiled/armv6/lib/libavutil.a \
-arch armv7 ./compiled/armv7/lib/libavutil.a \
-arch i386 ./compiled/i386/lib/libavutil.a

lipo -output ./compiled/fat/lib/libpostproc.a  -create \
-arch armv6 ./compiled/armv6/lib/libpostproc.a \
-arch armv7 ./compiled/armv7/lib/libpostproc.a \
-arch i386 ./compiled/i386/lib/libpostproc.a

lipo -output ./compiled/fat/lib/libswscale.a  -create \
-arch armv6 ./compiled/armv6/lib/libswscale.a \
-arch armv7 ./compiled/armv7/lib/libswscale.a \
-arch i386 ./compiled/i386/lib/libswscale.a