[Libav-user] Beginner c++ compiling error

[jan hölscher]

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.
>>
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>>
>>
>
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