[x265] Problem with linking x265 and ffmpeg

[宮村 公男]

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.  


// Miya
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