[Libav-user] Beginner c++ compiling error

[mounir younes]

Yes I did that ! But still having the problem after building.

On Wed, Sep 28, 2011 at 7:53 PM, jan hölscher <jan.hoelscher at codergrid.de>wrote:

> did you surround your libav header includes with :
>
> #ifdef __cplusplus
> extern "C" {
> #endif
> #include <libavformat/avformat.h>
> #include <libavcodec/avcodec.h>
> #include <libavcodec/opt.h>
> #include <libavutil/avutil.h>
> #include <libswscale/swscale.h>
> #include <libavutil/fifo.h>
> #include <libavutil/rational.h>
> #ifdef __cplusplus
> }
> #endif
>
>
> 2011/9/28 mounir younes <mounir.younes at gmail.com>
>
>> I gave the names without the linker prefix. I keep getting the "undefined
>> reference to" error and cannot solve it.
>>
>> On Sat, Sep 24, 2011 at 10:43 PM, Alex Cohn <alexcohn at netvision.net.il>wrote:
>>
>>> In your list of libs, "-l" is obviously doubled. Try to give the names to
>>> the linker without the prefix.
>>>  On Sep 24, 2011 7:58 AM, "mounir younes" <mounir.younes at gmail.com>
>>> wrote:
>>> > Hello, I am new to ffmpeg and I am getting compiling errors while
>>> compiling
>>> > c++ code with ffmpeg libraries. It seems that a lot of people are
>>> getting
>>> > this with the new ffmpeg but I couldn't find a solution that I could
>>> > understand.
>>> >
>>> > I found a link that says that this
>>> >
>>> > CXXFLAGS=-D__STDC_CONSTANT_MACROS ./configure
>>> > (http://code.google.com/p/ffmpegsource/issues/detail?id=11)
>>> >
>>> >
>>> > solves it but unfortunately I tried it but nothing happened and I don't
>>> know
>>> > what to do ! I am adding the file headers which are being automatically
>>> > detected by netbeans so the libraries are already found. I tried adding
>>> > these -lavdevice -lavformat -lavcodec -lavutil -lswscale -lbz2 to the
>>> > linker as well
>>> >
>>> > (
>>> >
>>> http://libav-users.943685.n4.nabble.com/QT-and-FFmpeg-undefined-reference-to-av-free-and-more-td946811.html
>>> > )
>>> >
>>> > when adding them netbeans knew them and gave them proper library icons
>>> (thus
>>> > it recognized that these libraries are present otherwise it would've
>>> > replaced them with a white icon with question mark). But, when
>>> compiling I
>>> > get this
>>> >
>>> > /usr/bin/ld: cannot find -l-lavdevice
>>> > /usr/bin/ld: cannot find -l-lavformat
>>> > /usr/bin/ld: cannot find -l-lavcodec
>>> > /usr/bin/ld: cannot find -l-lavutil
>>> > /usr/bin/ld: cannot find -l-lswscale
>>> > /usr/bin/ld: cannot find -l-lbz2
>>> >
>>> > And this is really killing me. I have been trying to solve this for
>>> days.
>>> >
>>> > Thank you in advance.
>>>
>>> _______________________________________________
>>> Libav-user mailing list
>>> Libav-user at ffmpeg.org
>>> http://ffmpeg.org/mailman/listinfo/libav-user
>>>
>>>
>>
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>>
>
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