[FFmpeg-user] undefined reference errors when calling avdevice_register_all()

[Thanh-Nghi Le]

When calling avdevice_register_all(), I got these errors:

/usr/local/lib/libavfilter.a(avf_showspectrum.o): In function
`config_output':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavfilter/avf_showspectrum.c:170:
undefined reference to `av_rdft_end'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavfilter/avf_showspectrum.c:171:
undefined reference to `av_rdft_init'
/usr/local/lib/libavfilter.a(avf_showspectrum.o): In function
`plot_spectrum_column':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavfilter/avf_showspectrum.c:298:
undefined reference to `av_rdft_calc'
/usr/local/lib/libavfilter.a(avf_showspectrum.o): In function `uninit':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavfilter/avf_showspectrum.c:106:
undefined reference to `av_rdft_end'
/usr/local/lib/libavfilter.a(vf_dctdnoiz.o): In function `dct_block':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavfilter/vf_dctdnoiz.c:82: undefined
reference to `av_dct_calc'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavfilter/vf_dctdnoiz.c:95: undefined
reference to `av_dct_calc'
/usr/local/lib/libavfilter.a(vf_dctdnoiz.o): In function `idct_block':
[......]

Here is my code:

#include <stdio.h>
#include <libavformat/avformat.h>

int main() {
	av_register_all();
	avdevice_register_all();

	return 0;
}

And I compile it as below:

gcc demo_capture.c -o demo_capture -pthread -lavformat -lavcodec -lavdevice
-lavfilter -lavutil -lswscale -lswresample -lpostproc -lz -lrt -lm -lx264
-lmp3lame -lvpx -lasound -lSDL

If I remove the function avdevice_register_all(), it's OK, no errors appears
then.
So what causes the above errors?



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