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Sur d’autres sites (10615)

  • How to specify a non default type when calling a FFmpeg library using ctypes

    1er août 2013, par Jim Ramberg

    I am calling an FFMPEG library called avformat_alloc_context() that returns a pointer to type AVFormatContext. The structure AVFormatContext is defined in the avformat library.

    Obviously ; this is not one ctypes default types and results in an error when I try to pass a reference to it to another ffmpeg library further down in my code.

    Is there a way to add in the the classes defined inside of the library ? I read through what documentation I could find online and was not able to find a good answer to this question.

  • Complie FFMpeg with Xcode5 preview's clang

    2 août 2013, par Yeung

    With release of IOS7 beta, I would like to try compiling ffmpeg for ios7.

    There is a lots answer like this. It use the llvm-gcc as compiler.

    However, seem like Xcode 5 would not include llvm-gcc. Then I have no choice but to use clang to compile.

    I use the following to config :

    export IOS_SDK="/Applications/Xcode5-DP4.app/Contents/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk"
    

    
./configure $CONFIG_DISABLE_FLAG $CONFIG_ENABLE_FLAG \
    
--arch=arm \
    
--target-os=darwin \
    
--cc=/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
    
--as='gas-preprocessor.pl /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' \
    
--ar=/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar  \
    
--sysroot=$IOS_SDK \
    
--cpu=cortex-a8 \
    
--extra-cflags="-arch armv7 -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot ${IOS_SDK} -I${IOS_SDK}/usr/include" \
    
--extra-ldflags="-arch armv7 -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot ${IOS_SDK} -L${IOS_SDK}/usr/lib" \
    
--enable-pic

    clang would probably not take CFLAGS other than -arch  -isysroot -I into account, but let it be.

    I seems it can complie but I encounter this. Actually, I don't understand the answer in this question. Using the external assembler ? Yes, the toolchains do have a assembler stated it is GNU version 1.38. Using --as=/Application/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as, it even cannot pass the check as test. It fall back to use 'gas-preprocessor.pl $CC'

    Here is the config log to cannot pass :

        check_asm armv6t2 "movt r0, #0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("movt r0, #0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm armvfp "fadds s0, s0, s0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("fadds s0, s0, s0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm neon "vadd.i16 q0, q0, q0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("vadd.i16 q0, q0, q0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm vfpv3 "vmov.f32 s0, #1.0"
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("vmov.f32 s0, #1.0"); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm asm_mod_y "vmul.i32 d0, d0, %y0" :: "x"(0)
    
check_as
    
BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
    1   void foo(void){ __asm__ volatile("vmul.i32 d0, d0, %y0" :: "x"(0)); }
    
END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
    
FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
    
check_asm gnu_as ".macro m n
    
\n:.int 0
    
.endm
    
m x"

    Yep, with config --disable-asm would complie but it probably not a option.

  • avconv : improve some variable names

    14 juin 2013, par Anton Khirnov
    avconv : improve some variable names

    ’filter’ is too generic, since the functions in question deal with
    
several filters.
    

    Also add const qualifiers to those variables.
    • [DH] avconv_filter.c

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