[x265] Problem with linking x265 and ffmpeg

Tue Apr 22 17:49:51 CEST 2014

2014/04/22 23:34、Steve Borho <steve <at> borho.org> のメール：

> On Tue, Apr 22, 2014 at 12:36 AM, 宮村 公男 <xanadu <at> apost.plala.or.jp> wrote:
>> 
>> 2014/04/22 2:07、Derek Buitenhuis <derek.buitenhuis <at> gmail.com> のメール：
>> 
>> On 4/21/2014 5:37 AM, 宮村 公男 wrote:
>> 
>> Here’s his comment:
>> “In order to be able to link libx265 to ffmpeg it requires -lstdc++ as a
>> compiler flag yet it does not provide it via pkg-config when ffmpeg asks for
>> the -cflags of libx265. It should add -lstdc++ to its Libs: line of the
>> x265.pc file.”
>> 
>> 
>> -lc++ *IS ADDED* if pkg-config is invoked with --static
>> during configure, which is what this configure option does.
>> 
>> Did you actually even try it? I get the feeling you didn’t.
>> 
>> 
>> I do tried to configure ffmpeg by adding "--pkg-config-flags=—static”
>> 
>> Here’s command line output and config.log of ffmpeg with your replay.
>> 
>> <command line output>
>> $ ./configure --prefix=${TARGET} --as=yasm --enable-gpl --enable-libx265
>> --pkg-config-flags=—static
>> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
>> --with-gxx-include-dir=/usr/include/c++/4.2.1
>> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
>> --with-gxx-include-dir=/usr/include/c++/4.2.1
>> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
>> --with-gxx-include-dir=/usr/include/c++/4.2.1
>> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
>> --with-gxx-include-dir=/usr/include/c++/4.2.1
>> Package —static was not found in the pkg-config search path.
>> Perhaps you should add the directory containing `—static.pc'
>> to the PKG_CONFIG_PATH environment variable
>> No package '—static' found
>> Package —static was not found in the pkg-config search path.
>> Perhaps you should add the directory containing `—static.pc'
>> to the PKG_CONFIG_PATH environment variable
>> No package '—static' found
>> ERROR: x265 not found
>> 
>> <config.log>
>> check_pkg_config x265 x265.h x265_encoder_encode
>> pkg-config --exists --print-errors x265
>> check_func_headers x265.h x265_encoder_encode
>> check_ld cc
>> check_cc
>> BEGIN /var/folders/qk/x9k9r6f955d75dnv5dd2rgm00000gn/T//ffconf.IUpdYOQo.c
>>   1 #include <x265.h>
>>   2 long check_x265_encoder_encode(void) { return (long)
>> x265_encoder_encode; }
>>   3 int main(void) { return 0; }
>> END /var/folders/qk/x9k9r6f955d75dnv5dd2rgm00000gn/T//ffconf.IUpdYOQo.c
>> gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC
>> -I/Volumes/ffmpeg_compile/include -L/Volumes/ffmpeg_compile/lib -std=c99
>> -mdynamic-no-pic -fomit-frame-pointer -fPIC -pthread -c -o
>> /var/folders/qk/x9k9r6f955d75dnv5dd2rgm00000gn/T//ffconf.mIIfdUZ5.o
>> /var/folders/qk/x9k9r6f955d75dnv5dd2rgm00000gn/T//ffconf.IUpdYOQo.c
>> clang: warning: argument unused during compilation:
>> '-L/Volumes/ffmpeg_compile/lib'
>> gcc -L/Volumes/ffmpeg_compile/lib -Wl,-dynamic,-search_paths_first -o
>> /var/folders/qk/x9k9r6f955d75dnv5dd2rgm00000gn/T//ffconf.FoLI6JH8
>> /var/folders/qk/x9k9r6f955d75dnv5dd2rgm00000gn/T//ffconf.mIIfdUZ5.o -lm
>> -lbz2 -lz -pthread
>> clang: warning: argument unused during compilation: '-pthread'
>> Undefined symbols for architecture x86_64:
>> "_x265_encoder_encode", referenced from:
>>     _check_x265_encoder_encode in ffconf.mIIfdUZ5.o
>>    (maybe you meant: _check_x265_encoder_encode)
>> ld: symbol(s) not found for architecture x86_64
>> clang: error: linker command failed with exit code 1 (use -v to see
>> invocation)
>> ERROR: x265 not found
>> 
>> 
>> Have you read his comment carefully?
>> He say "-lstdc++” compiler flag should be passed to ffmpeg via pkg-config
>> (x265.pc) when ffmpeg asks for the -cflags of x265.  But current x265 does
>> not provide it.
>> 
>> 
>> So x265.pc should be as follows:
>> --- a/x265.pc 2014-04-16 14:50:20.000000000 +0900
>> +++ b/x265.pc 2014-04-21 10:54:32.000000000 +0900
>> @@ -6,6 +6,6 @@
>> Name: x265
>> Description: H.265/HEVC video encoder
>> Version: 0.9
>> -Libs: -L${libdir} -lx265
>> +Libs: -L${libdir} -lx265 -lstdc++
>> Libs.private: -lc++
>> -l/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/5.1/lib/darwin/libclang_rt.osx.a
>> Cflags: -I${includedir}
>> 
>> 
>> Incorrect. You are adding the wrong C++ stdlib. See my
>> explanation above.
>> 
>> 
>> I can’t understand what is incorrect.  by addiing "-lstdc++” compiler flag
>> to Libs: line of x265.pc, We can solve this “x265 not found” problem.
>> This must be a bug with x265.
>> 
>> 
>> Also, I have problem with x265 shard build:
>> $ export VOLNAME=x265-ffmpeg
>> $ export TARGET="/Volumes/${VOLNAME}"
>> $ export PATH=${TARGET}/bin:$PATH
>> 
>> $ cd ../x265/build/
>> $ mkdir shard
>> $ cd shard/
>> $ cmake -DCMAKE_INSTALL_PREFIX:PATH=${TARGET} ../../source/
>> $ make -j 4 && make install
>> 
>> -- Install configuration: "Release"
>> -- Installing: /Volumes/x265-ffmpeg/lib/libx265.a
>> -- Up-to-date: /Volumes/x265-ffmpeg/include/x265.h
>> -- Installing: /Volumes/x265-ffmpeg/include/x265_config.h
>> -- Installing: /Volumes/x265-ffmpeg/lib/libx265.0.0.dylib
>> -- Installing: /Volumes/x265-ffmpeg/lib/libx265.16.dylib
>> -- Installing: /Volumes/x265-ffmpeg/lib/libx265.dylib
>> -- Installing: /Volumes/x265-ffmpeg/lib/pkgconfig/x265.pc
>> -- Installing: /Volumes/x265-ffmpeg/bin/x265
>> 
>> $ which x265
>> /Volumes/x265-ffmpeg/bin/x265
>> 
>> $ cd ~
>> $ x265 --help
>> dyld: Library not loaded: libx265.16.dylib
>> Referenced from: /Volumes/x265-ffmpeg/bin/x265
>> Reason: image not found
>> Trace/BPT trap: 5
>> 
>> Same as x265 binary, ffmpeg binary fails to execute because x265 shard
>> library can’t be loaded.
>> I’d like to know what is happening with x265 shard library too.
> 
> what's a shard?
> 
> anyway, if you install into some random folder that is not in the
> system library load path, then you need to tell cmake to enable RPATH
> in the executable.  This is roughly documented here:
> 
> http://www.cmake.org/Wiki/CMake_RPATH_handling
> 
> I suspect you need to add something line:
> -DCMAKE_INSTALL_RPATH_USE_LINK_PATH=true to the cmake command line

The directory “shard" which I created in the build directory is the directory to build shard library type x265.  Not big meaning…

OK, based on the document which you introduce, I can fix "dyld: Library not loaded: libx265.16.dylib” issue.  Since I use Mac OS X, I have added "export DYLD_LIBRARY_PATH=${TARGET}/lib” then x265 and ffmpeg can execute with shard library.
I don’t add  "-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=true" to the cmake command line.

Can I ask issue of adding "-lstdc++” flag to x265.pc to you?

// Miya
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