ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 15 -s 1280x1024 -i 00:02.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 0 sillyexp.avi
ffmpeg version N-74527-gecf6b26 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  configuration: --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libopencore-amrnb --enable-libvorbis --enable-libvpx --enable-version3 --enable-libass --enable-libfdk_aac --enable-nonfree --enable-libopus --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrwb --enable-librtmp --enable-x11grab --enable-nonfree --enable-version3 --enable-avfilter --enable-postproc --enable-libass --enable-libopencore-amrnb --enable-libxvid --disable-vdpau --enable-libvpx --mandir=/usr/pkg/man --cc=gcc --prefix=/usr/pkg --disable-debug --disable-stripping --enable-shared --enable-pthreads --enable-runtime-cpudetect --enable-avfilter --enable-pthreads --enable-x11grab --enable-bzlib --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libschroedinger --enable-libtheora --enable-libx264 --enable-libxvid --enable-zlib
  WARNING: library configuration mismatch
  avutil      configuration: --prefix=/usr/local --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis --enable-pic --enable-shared --enable-gpl --enable-nonfree --enable-libtheora --enable-libvpx
  avcodec     configuration: --prefix=/usr/local --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis --enable-pic --enable-shared --enable-gpl --enable-nonfree --enable-libtheora --enable-libvpx
  avformat    configuration: --prefix=/usr/local --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis --enable-pic --enable-shared --enable-gpl --enable-nonfree --enable-libtheora --enable-libvpx
  avfilter    configuration: --prefix=/usr/local --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis --enable-pic --enable-shared --enable-gpl --enable-nonfree --enable-libtheora --enable-libvpx
  swscale     configuration: --prefix=/usr/local --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis --enable-pic --enable-shared --enable-gpl --enable-nonfree --enable-libtheora --enable-libvpx
  libavutil      54. 31.100 / 54. 17.  0
  libavcodec     56. 58.100 / 56. 35.  1
  libavformat    56. 40.101 / 56. 21.  0
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 35.100 /  5.  1.  0
  libswscale      3.  1.101 /  3.  0.  0
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
ffmpeg: relocation error: ffmpeg: symbol av_dict_set_int, version LIBAVUTIL_54 not defined in file libavutil.so.54 with link time reference