objective-c - 为 iOS5 编译 FFMPEG 时出现大问题

Question

我正在尝试为 iOS5 编译 ffmpeg 库。我尝试了不同的选项，但都没有用。

我下载了这个:https://github.com/ciphor/ffmpeg4ios .

我尝试了原始的 build_armv7，但它没有用。我编辑了 build_arm7 文件，现在它看起来像这样:

#!/bin/tcsh -f

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

rm armv7/*.a

make clean

./configure --disable-network --disable-mpegaudio-hp --disable-lpc --disable-vaapi 
--disable-vdpau --disable-hwaccels --disable-mmx --disable-mmx2 --disable-sse 
--disable-ssse3 --disable-avx --disable-amd3dnow --disable-amd3dnowext --disable-vis 
--disable-mmi --disable-doc --disable-yasm --disable-ffmpeg --disable-ffplay 
--disable-ffprobe --disable-ffserver --disable-rdft --disable-dxva2 --disable-encoders 
--disable-decoders --enable-decoder=h264 --disable-bsfs --disable-protocols 
--disable-indevs --disable-outdevs --disable-devices --disable-filters --disable-demuxers --enable-demuxer=h264 
--disable-muxers --disable-parsers --enable-parser=h264 --enable-cross-compile --arch=arm 
--target-os=darwin 
--cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 --as='gas-preprocessor/gas-preprocessor.pl /Aplications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2' 
--sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk --cpu=cortex-a8 
--extra-cflags='-pipe -Os -gdwarf-2 -issysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} 
-mthumb-interwork' --extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' --enable-pic


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/

但是我得到这个错误:

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 is unable to create an executable file. C compiler test failed.

我在网上找遍了。我已经阅读了关于 stackoverflow 的所有帖子，但没有一个对我有帮助。请告诉我哪里做错了，请不要给我发链接:相信我，我都看到了!

Answer 1

这对我适用于 iOS 5.0 和 Snow Leopard。 您必须更改 ldflags、sysroot 和 cc 以提供 Mountain Lion 中文件的有效路径 Xcode 已移至另一个文件夹。

./configure \
--extra-ldflags=-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/system \
    --disable-muxers \
    --disable-demuxers \
    --disable-devices \
    --disable-parsers \
    --disable-protocols \
    --disable-filters \
    --disable-bsfs \
    --disable-doc \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-avfilter \
    --disable-avformat \
    --disable-ffserver \
    --disable-decoders \
    --disable-encoders \
    --disable-network \
    --enable-decoder=h261 \
    --enable-decoder=h263 \
    --enable-decoder=h263p \
    --enable-encoder=h261 \
    --enable-encoder=h263 \
    --enable-encoder=h263p \
    --enable-cross-compile \
    --enable-hardcoded-tables \
    --enable-memalign-hack \
    --enable-neon \
    --arch=arm \
    --target-os=darwin \
    --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
    --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk \
    --cpu=cortex-a8 \
    --extra-cflags='-arch armv7 -mno-thumb -mfpu=neon -mfloat-abi=softfp' \
    --extra-ldflags='-arch armv7 -mno-thumb -mfpu=neon -mfloat-abi=softfp' 2>&1 | tee configure.log

    make clean 
    make