[FFmpeg-user] decklink seems to be broken down

[Anshul Maheshwari]

On Thu, Dec 4, 2014 at 7:19 PM, Anshul Maheshwari <anshul.ffmpeg at gmail.com>
wrote:

> I am using git pulled just before this mail.
>
> Here is some error that I am getting
> LD      ffmpeg_g
> /usr/bin/ld: libavdevice/libavdevice.a(decklink_common.o): undefined
> reference to symbol 'dlsym@@GLIBC_2.2.5'
> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libdl.so:
> error adding symbols: DSO missing from command line
> collect2: error: ld returned 1 exit status
> make: *** [ffmpeg_g] Error 1
>
>
> If I look doing verbose you can see I have already added -ldl in my extra
> ldflags
> anshulm at tele-uni01:~/work/bmd/test/ffmpeg$ make V=1
> gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample
> -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -ldl
> -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common
> -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
> -o ffmpeg_g cmdutils.o ffmpeg_opt.o ffmpeg_filter.o ffmpeg.o
> ffmpeg_vdpau.o -lavdevice -lavfilter -lavformat -lavcodec -lswresample
> -lswscale -lavutil -lXv -lX11 -lXext -lstdc++ -lstdc++ -lva -lxcb -lxcb-shm
> -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lxcb-shape -lxcb -lX11
> -ljack -lasound -lSDL -lm -llzma -lz -pthread  -lvdpau
> /usr/bin/ld: libavdevice/libavdevice.a(decklink_common.o): undefined
> reference to symbol 'dlsym@@GLIBC_2.2.5'
> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libdl.so:
> error adding symbols: DSO missing from command line
> collect2: error: ld returned 1 exit status
> make: *** [ffmpeg_g] Error 1
>
> Its look like an library order issue, if I use library at the end of
> coomand, it works.
> anshulm at tele-uni01:~/work/bmd/test/ffmpeg$ gcc -Llibavcodec -Llibavdevice
> -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc
> -Llibswscale -Llibswresample -ldl  -Wl,--as-needed -Wl,-z,noexecstack
> -Wl,--warn-common
> -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
> -o ffmpeg_g cmdutils.o ffmpeg_opt.o ffmpeg_filter.o ffmpeg.o
> ffmpeg_vdpau.o -lavdevice -lavfilter -lavformat -lavcodec -lswresample
> -lswscale -lavutil -lXv -lX11 -lXext -lstdc++ -lstdc++ -lva -lxcb -lxcb-shm
> -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lxcb-shape -lxcb -lX11
> -ljack -lasound -lSDL -lm -llzma -lz -pthread  -lvdpau -ldl
>
> Sorry for noise, works with
/configure --enable-decklink
--extra_cflags="-I/home/anshulm/work/bmd/Blackmagic_DeckLink_SDK_10.1.1/Linux/include/"
--extra-ldflags="-ldl" --extra-libs=-ldl