[Libav-user] ffmpeg static library linking issue

[yuvaraj r]

I have only static libraries

Thanks

Yuvaraj

On Tue, Feb 7, 2012 at 4:10 PM, Alex Cohn <alexcohn at netvision.net.il> wrote:
> On Tue, Feb 7, 2012 at 06:54, yuvaraj r <yuvaraj.tr at gmail.com> wrote:
>> Hi All,
>>
>>
>> I compiled the ffmpeg source to generate the static(.a foramt)
>> libraries  in linux.
>>
>> When i am linking the static libraries with my application,
>>
>> i am getting undefined reference for many functions.
>>
>> Even i tried with pkg-config.
>>
>> Here command , what i tried
>>
>>
>> gcc -shared -Wl,-soname,librecorder.so.1 '-Wl,-rpath,lib'  -lpthread
>> -lXdamage -lXfixes -lXmu -lXi -lX11
>> -L/home/peter/Desktop/screenrecorder/librecorder/src/../dependencies/lib
>>  -lavformat -lavcodec -lavutil -lswscale `pkg-config --libs --cflags
>> libavutil` `pkg-config --libs --cflags libswscale` `pkg-config --libs
>> --cflags libavcodec` `pkg-config --libs --cflags libavformat` -o
>> librecorder.so.1.1 init.o main_entry.o xtoffmpeg.o
>>
>>
>> It is generated the librecorder library. I have all dependency libs
>>
>> when executing ld command
>>
>> #ld librecorder.so.1.1
>>
>> librecorder.so.1: undefined reference to `av_new_stream'
>> librecorder.so.1: undefined reference to `av_read_packet'
>> librecorder.so.1: undefined reference to `avcodec_alloc_frame'
>> librecorder.so.1: undefined reference to `av_close_input_file'
>> librecorder.so.1: undefined reference to `audio_resample'
>> librecorder.so.1: undefined reference to `avcodec_find_encoder'
>> librecorder.so.1: undefined reference to `av_find_input_format'
>> librecorder.so.1: undefined reference to `avcodec_encode_audio'
>> librecorder.so.1: undefined reference to `dump_format'
>> librecorder.so.1: undefined reference to `av_open_input_file'
>> librecorder.so.1: undefined reference to `avcodec_find_decoder'
>> librecorder.so.1: undefined reference to `avcodec_close'
>> librecorder.so.1: undefined reference to `av_find_stream_info'
>> librecorder.so.1: undefined reference to `audio_resample_init'
>> librecorder.so.1: undefined reference to `avpicture_get_size'
>> librecorder.so.1: undefined reference to `av_register_all'
>> librecorder.so.1: undefined reference to `avcodec_decode_audio'
>> librecorder.so.1: undefined reference to `avcodec_open'
>> librecorder.so.1: undefined reference to `avcodec_encode_video'
>> librecorder.so.1: undefined reference to `av_destruct_packet_nofree'
>> librecorder.so.1: undefined reference to `avpicture_fill'
>> librecorder.so.1: undefined reference to `av_set_parameters'
>> librecorder.so.1: undefined reference to `av_alloc_format_c
>>
>> Now problem with static libraries.
>>
>>
>> #pkg-config --list-all | grep mpeg
>> libswscale                       libswscale - FFmpeg image rescaling library
>> libavutil                        libavutil - FFmpeg utility library
>> libavformat                      libavformat - FFmpeg container format library
>> libavcodec                       libavcodec - FFmpeg codec library
>>
>>
>> How do i solve this issue
>>
>>
>> Thanks
>>
>>
>> Yuvaraj R
>
> As far as I know, -l flag on the gcc command line will prefer the
> shared version of the library. I.e. if you have both libavformat.a and
> libavformat.so visible to gcc, the latter will be used.
>
> BR,
> Alex
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