So I have a very sample code for trying to decode a FFMPEG video stream. My problem is avcodec does not want to link, to do so I made a clean installation of Ubuntu 13.04. I have build ffmpeg from source following the guide here: https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
I just want to compile my file. Note that my ubuntu does not have any implementations or header files for avcodec. The command line I use is: gcc -I/home/USER/ffmpeg_build/include -L/home/USER/ffmpeg_build/lib -lavcodec -o test.exe Downloads/auv/src/dronerosvideo/src/ar2.cpp /tmp/ccKTprFq.o: In function `fetch_and_decode(int, int, bool)': ar2.cpp:(.text+0x36e): undefined reference to `avcodec_register_all' ar2.cpp:(.text+0x378): undefined reference to `av_log_set_level' ar2.cpp:(.text+0x382): undefined reference to `avcodec_find_decoder' ar2.cpp:(.text+0x3b1): undefined reference to `avcodec_alloc_context3' ar2.cpp:(.text+0x3d6): undefined reference to `avcodec_open2' ar2.cpp:(.text+0x46d): undefined reference to `av_init_packet' ar2.cpp:(.text+0x50a): undefined reference to `avcodec_decode_video2' ar2.cpp:(.text+0x534): undefined reference to `av_free_packet' /tmp/ccKTprFq.o:(.eh_frame+0x13): undefined reference to `__gxx_personality_v0' collect2: error: ld returned 1 exit status Just for a sane test if I remove the -L argument compiler says: /usr/bin/ld: cannot find -lavcodec Which means that the linker finds the library in */home/USER/ffmpeg_build/lib*. Also if we check the library for implementation it exists: nm ffmpeg_build/lib/libavcodec.a | grep "register_all"0000000000000000 T avcodec_register_all Also as advised since it is C++ I have exten "C" around the include of the library. At this point I'm falling out of any ideas at all, why exactly compilation fails?
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