gcc demo_capture.c -o demo_capture -pthread -lavformat -lavcodec -lavfilter -lavdevice -lavutil -lswscale -lswresample -lpostproc -lz -lrt -lm -lx264 -lmp3lame -lvpx -lasound -lSDL
/usr/local/lib/libavdevice.a(lavfi.o): In function `lavfi_read_packet':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:338: undefined reference to `av_buffersink_get_frame_flags'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:360: undefined reference to `av_buffersink_get_frame_flags'
/usr/local/lib/libavdevice.a(lavfi.o): In function `lavfi_read_close':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:86: undefined reference to `avfilter_graph_free'
/usr/local/lib/libavdevice.a(lavfi.o): In function `lavfi_read_header':
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:106: undefined reference to `avfilter_register_all'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:108: undefined reference to `avfilter_get_by_name'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:109: undefined reference to `avfilter_get_by_name'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:141: undefined reference to `avfilter_graph_alloc'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:144: undefined reference to `avfilter_graph_parse_ptr'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:230: undefined reference to `avfilter_graph_create_filter'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:244: undefined reference to `avfilter_graph_create_filter'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:258: undefined reference to `avfilter_link'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:263: undefined reference to `avfilter_graph_config'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:267: undefined reference to `avfilter_graph_dump'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:293: undefined reference to `avfilter_link_get_channels'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:310: undefined reference to `avfilter_inout_free'
/opt/install-ffmpeg/ffmpeg-2.1.4/libavdevice/lavfi.c:311: undefined reference to `avfilter_inout_free'
collect2: ld returned 1 exit status
make: *** [demo_capture] Error 1