为iFrameExtractor编译ffmpeg的问题

Question

我正在尝试使用iFrameExtractor示例中的make和build文件来编译ffmpeg .首先,我试图遵循github上的自述文件,该文件只表示./build_universal在ffmpeg文件夹中运行.那没起效

然后,我尝试按照INSTALL中的信息进行操作,但没有成功.然后我尝试在INSTALL中执行这些操作,然后执行该操作./build_universal.导入到项目的所有*.a文件都存在,直到构建序列结束.当运行build_universal中的lipo命令时,我想连接不同体系结构的.a文件(？).无论如何这些都会留下以下错误:

lipo: specifed architecture type (armv6) for file (armv6/libavcodec.a) does not match it's cputype (16777223) and cpusubtype (3) (should be cputype (12) and cpusubtype (6))
lipo: specifed architecture type (armv6) for file (armv6/libavdevice.a) does not match it's cputype (16777223) and cpusubtype (3) (should be cputype (12) and cpusubtype (6))
lipo: specifed architecture type (armv6) for file (armv6/libavformat.a) does not match it's cputype (16777223) and cpusubtype (3) (should be cputype (12) and cpusubtype (6))
lipo: specifed architecture type (armv6) for file (armv6/libavutil.a) does not match it's cputype (16777223) and cpusubtype (3) (should be cputype (12) and cpusubtype (6))
lipo: specifed architecture type (armv6) for file (armv6/libswscale.a) does not match it's cputype (16777223) and cpusubtype (3) (should be cputype (12) and cpusubtype (6))

我可以让项目为模拟器编译,如果我只使用./build_armv7但如果我运行通用的.a文件最终被删除.并且只使用不能为iphone 4构建.

Answer 1

经过一周的试验和错误,我终于能够创建ffmpeg通用库并成功编译并运行设备和模拟器的iFrameExtractor.

要在iPhone设备或模拟器上编译和运行项目:

1)打开终端

2)克隆存储库:git clone git://github.com/lajos/iFrameExtractor.git

3)转到项目中的ffmpeg文件夹:cd iFrameExtractor/ffmpeg

4)运行:./ configure

5)编辑构建脚本(build_armv6,build_armv7,build_i386),如下所示:

这些脚本假设您在Xcode 4.2上使用iOS SDK 5.0.

build_armv6:

#!/bin/tcsh -f

if (! -d armv6) mkdir armv6
if (! -d lib) mkdir lib

rm armv6/*.a

make clean

./configure \
--disable-bzlib --disable-doc \
--disable-ffmpeg --disable-ffplay \
--disable-ffserver --disable-mmx \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--enable-cross-compile --target-os=darwin \
--arch=arm --cpu=arm1176jzf-s \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk \
--extra-ldflags="-arch armv6 -L//Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/system" \
--extra-cflags="-arch armv6"

make

mv libavcodec/libavcodec.a armv6/
mv libavdevice/libavdevice.a armv6/
mv libavformat/libavformat.a armv6/
mv libavutil/libavutil.a armv6/
mv libswscale/libswscale.a armv6/

rm lib/*.a

cp armv6/*.a lib/

build_armv7:

#!/bin/tcsh -f

if (! -d armv7) mkdir armv7
if (! -d lib) mkdir lib

rm armv7/*.a

make clean

./configure \
--disable-bzlib --disable-doc \
--disable-ffmpeg --disable-ffplay \
--disable-ffserver --disable-mmx \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--enable-cross-compile --target-os=darwin \
--arch=arm --cpu=cortex-a8 --enable-pic \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk \
--extra-ldflags="-arch armv7 -    L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/system" \
--extra-cflags="-arch armv7"

make

mv libavcodec/libavcodec.a armv7/
mv libavdevice/libavdevice.a armv7/
mv libavformat/libavformat.a armv7/
mv libavutil/libavutil.a armv7/
mv libswscale/libswscale.a armv7/

rm lib/*.a

cp armv7/*.a lib/

build_i386:

#!/bin/tcsh -f

if (! -d i386) mkdir i386
if (! -d lib) mkdir lib

rm i386/*.a

make clean

./configure \
--disable-bzlib --disable-doc \
--disable-ffmpeg --disable-ffplay \
--disable-ffserver --disable-mmx \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--as='gas-preprocessor/gas-preprocessor.pl     /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
--sysroot=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk \
--extra-ldflags="-arch i386 -L//Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/usr/lib/system" \
--extra-cflags="-arch i386 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -O0 -fasm-blocks -Wreturn-type -Wunused-variable -D__IPHONE_OS_VERSION_MIN_REQUIRED=40000 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -fvisibility=hidden -mmacosx-version-min=10.5 -gdwarf-2"

make

mv libavcodec/libavcodec.a i386/
mv libavdevice/libavdevice.a i386/
mv libavformat/libavformat.a i386/
mv libavutil/libavutil.a i386/
mv libswscale/libswscale.a i386/

rm lib/*.a

cp i386/*.a lib/

6)构建ffmpeg库:./ build_universal

7)打开xcode项目并在iPhone设备或模拟器上运行它

这些步骤对我来说非常合适.我希望这会帮助其他人努力让ffmpeg库为iOS工作.

Answer 2

我下载了最新的ffmpeg存储库,并使用以下内容仅编译armv6和armv7.我无法让它适用于i386,我收到的错误是cputype和subputype是错误的.显然cputype应该是x86,subputype应该是intel.

无论如何,我使用以下构建脚本来编译arm架构:

构建脚本:

#!/bin/sh

set -e

SCRIPT_DIR=$( (cd -P $(dirname $0) && pwd) )
DIST_DIR_BASE=${DIST_DIR_BASE:="$SCRIPT_DIR/dist"}

if [ -d ffmpeg ]
then
  echo "Found ffmpeg source directory, no need to fetch from git..."
else
  echo "Fetching ffmpeg from git://git.videolan.org/ffmpeg.git..."
  git clone git://git.videolan.org/ffmpeg.git
fi

ARCHS=${ARCHS:-"armv6 armv7"}

for ARCH in $ARCHS
do
    FFMPEG_DIR=ffmpeg-$ARCH
    if [ -d $FFMPEG_DIR ]
    then
      echo "Removing old directory $FFMPEG_DIR"
      rm -rf $FFMPEG_DIR
    fi
    echo "Copying source for $ARCH to directory $FFMPEG_DIR"
    cp -a ffmpeg $FFMPEG_DIR

    cd $FFMPEG_DIR

    DIST_DIR=$DIST_DIR_BASE-$ARCH
    mkdir -p $DIST_DIR

    case $ARCH in
        armv6)
            EXTRA_FLAGS="--enable-cross-compile --target-os=darwin --arch=arm --cpu=arm1176jzf-s"
            EXTRA_CFLAGS="-arch $ARCH"
            EXTRA_LDFLAGS="-arch $ARCH"
            ;;
        armv7)
            EXTRA_FLAGS="--enable-cross-compile --target-os=darwin --arch=arm --cpu=cortex-a8 --enable-pic"
            EXTRA_CFLAGS="-arch $ARCH"
            EXTRA_LDFLAGS="-arch $ARCH"
            ;;
        x86_64)
            EXTRA_CC_FLAGS="-mdynamic-no-pic"
            ;;
    esac

    echo "Configuring ffmpeg for $ARCH..."
    ./configure \
    --prefix=$DIST_DIR \
    --extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system \
    --disable-bzlib \
    --disable-doc \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-ffserver \
    --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
    --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
    --extra-ldflags="$EXTRA_LDFLAGS" \
    --extra-cflags="$EXTRA_CFLAGS" \
    $EXTRA_FLAGS

    echo "Installing ffmpeg for $ARCH..."
    make && make install

    cd $SCRIPT_DIR

    if [ -d $DIST_DIR/bin ]
    then
      rm -rf $DIST_DIR/bin
    fi
    if [ -d $DIST_DIR/share ]
    then
      rm -rf $DIST_DIR/share
    fi
done

并结合libs脚本:

#!/bin/bash

set -e

ARCHS="armv6 armv7"

for ARCH in $ARCHS
do
  if [ -d dist-$ARCH ]
  then
    MAIN_ARCH=$ARCH
  fi
done

if [ -z "$MAIN_ARCH" ]
then
  echo "Please compile an architecture"
  exit 1
fi


OUTPUT_DIR="dist-uarch"
rm -rf $OUTPUT_DIR

mkdir -p $OUTPUT_DIR/lib $OUTPUT_DIR/include

for LIB in dist-$MAIN_ARCH/lib/*.a
do
  LIB=`basename $LIB`
  LIPO_CREATE=""
  for ARCH in $ARCHS
  do
    if [ -d dist-$ARCH ]
    then
      LIPO_CREATE="$LIPO_CREATE-arch $ARCH dist-$ARCH/lib/$LIB "
    fi
  done
  OUTPUT="$OUTPUT_DIR/lib/$LIB"
  echo "Creating: $OUTPUT"
  lipo -create $LIPO_CREATE -output $OUTPUT
  lipo -info $OUTPUT
done

echo "Copying headers from dist-$MAIN_ARCH..."
cp -R dist-$MAIN_ARCH/include/* $OUTPUT_DIR/include

然后我从BUILD-FOLDER/dist-uarch导入.a文件,它就像魅力一样在xcode中构建!