[Libav-user] Can not link ffmpeg without pkg-config

[Javier Lopez]

I tried, bot does not work.
Could I link both libraries to one ffmpeg_sdl without troubles with
licenses?, It would be nice to compile using:

gcc -o program program.c -lffmpeg_sdl

2016-08-30 15:28 GMT+02:00 Peter Steinbach <steinbach at scionics.de>:

> linking order matters definitely! see this nice introductory post
> http://eli.thegreenplace.net/2013/07/09/library-order-in-static-linking/
>
> put -lx264 after -lavcodec!
> Peter
>
>
> On 08/30/2016 01:28 PM, Javier Lopez wrote:
>
>> I simplified a few using the pkg-config to one call by using both flags:
>> --clibs and --cflags:
>>
>> gcc  -o ffmpeg_player ffmpeg_player_01.c -Wall -ggdb $(pkg-config --cflags
>> --libs libavformat libavcodec libswresample libswscale libavutil sdl) -lm
>>
>> And it worked!
>>
>>
>> I also tried to compile without the pkg-config adding all dependencies:
>>
>> gcc  -o ffmpeg_player ffmpeg_player_01.c -Wall -ggdb -lavformat -lvdpau
>> -lva -lva-drm -lva-x11 -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb-render
>> -lxcb-shape -lX11 -lasound -lSDL -lx264 -lmp3lame -lfdk-aac -lm -lz
>> -pthread -lavcodec -lvdpau -lswresample -lswscale -lavutil -lSDL
>>
>> Still I have following error: libavcodec/libx264.c:814: undefined
>> reference
>> to `x264_encoder_open_148'
>>
>> I listed all dependencies of libavcodec and all of them where included,
>> perhaps order minds.
>>
>>
>>
>>
>>
>> 2016-08-29 16:11 GMT+02:00 Javier Lopez <jlopez2022 at gmail.com>:
>>
>> I would like to simplify in order to add more libs to the ffmpeg like
>>> opencl and sdl libs and I do not know how to link using pkg-config
>>> combined with no pkg-config libraries
>>> I tried to add the sdl-config but it did not worked.
>>> I will try to add all those libraries and to list them using pkg-config
>>> --libs,
>>>
>>> javier
>>>
>>> 2016-08-29 14:29 GMT+02:00 Perette Barella <perette at barella.org>:
>>>
>>> Then I can compile and link using the following command line:
>>>>> gcc  -o ffmpeg_grabber ffmpeg_grabber_03.c -Wall -ggdb $(pkg-config
>>>>>
>>>> --cflags libavformat libavcodec libswresample libswscale libavutil sdl)
>>>> $(pkg-config --libs libavformat libavcodec libswresample libswscale
>>>> libavutil sdl) -lm
>>>>
>>>>>
>>>>> But I have a lot of link errors (undefined a lot of things) removing
>>>>>
>>>> pkg-config:
>>>>
>>>>> gcc  -o test test.c -Wall -lavformat -lavcodec -lswresample -lswscale
>>>>>
>>>> -lavutil -lm
>>>>
>>>>>
>>>>> The question is: How to avoid undefine errors without using the
>>>>>
>>>> pkg-config?
>>>>
>>>> When static linking, you need to link not only the ffmpeg libraries
>>>> themselves, but all the libraries that they link to in turn.  In this
>>>> command:
>>>>
>>>>> pkg-config --libs libavformat libavcodec libswresample libswscale
>>>>>
>>>> libavutil sdl
>>>>
>>>>
>>>> `pkg-config --libs` gets the link flags necessary (there’s also a
>>>> --cflags option too), including all those indirectly needed libraries,
>>>> to
>>>> link.  You can run pkg-config --libs on the command line to see the
>>>> list.
>>>>
>>>> This list will not always be the same.  My Mac, for example, includes
>>>> pthreads among the automatically-linked system libraries, so there will
>>>> be
>>>> no ‘-lpthreads’, but it includes -L/opt/local/lib, because it’s
>>>> installed
>>>> in a non-default place where the linker won’t look.  Link flags also
>>>> depend
>>>> on what ffmpeg was configured and built with: for example, if libfoobar
>>>> is
>>>> installed, there could be a dependency for -lfoobar; but if missing
>>>> when I
>>>> ran ./configure on ffmpeg, then I might have ffmpeg but without whatever
>>>> capabilities foobar provides.  `configure` scripts see what’s available
>>>> and
>>>> build what they can, and they often utilize information from pkg-config
>>>> where it’s available.
>>>>
>>>> I wonder *why* are you avoiding pkg-config? Are you planning to
>>>> build/compile on a system without it?  Are you thinking of a portable
>>>> `configure` script, and considering what to do if pkg-config is missing?
>>>> Because pkg-config came about to solve the problem you’re running into.
>>>> I’ve seen some debate about whether pkg-config solves the problem right,
>>>> but it is the thing in place and trying to avoid it is to make yourself
>>>> problems.  Not using it means a lot of extra trouble, so unless you
>>>> have a
>>>> *really* good reason...
>>>>
>>>> Perette
>>>>
>>>> _______________________________________________
>>>> Libav-user mailing list
>>>> Libav-user at ffmpeg.org
>>>> http://ffmpeg.org/mailman/listinfo/libav-user
>>>>
>>>>
>>>
>>>
>>
>>
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