经过一周的反复试验,我终于能够创建 ffmpeg 通用库,并成功为设备和模拟器编译和运行 iFrameExtractor。
要在 iPhone 设备或模拟器上编译并运行该项目:
1)打开终端
2)克隆存储库: git clone git://github.com/lajos/iFrameExtractor.git
3)进入项目中的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:
这些脚本假设您在 Xcode 4.2 上使用 iOS SDK 5.0。
构建_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/
构建_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/
构建_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项目并在你的iPhone设备或模拟器上运行它
这些步骤非常适合我。我希望这能帮助其他努力让 ffmpeg 库在 iOS 上工作的人。