ffmpeg version 1.2.3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Sep 13 2013 21:52:11 with gcc 4.7.3 (Gentoo 4.7.3 p1.0, pie-0.5.5)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-O2 -pipe -march=native' --extra-cflags='-O2 -pipe -march=native' --extra-cxxflags='-O2 -pipe -march=native' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --enable-version3 --disable-indev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --disable-network --disable-openssl --enable-ffplay --disable-vaapi --disable-vdpau --enable-zlib --enable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --disable-libfdk-aac --disable-libaacplus --disable-libfaac --disable-libtheora --disable-libtwolame --enable-libx264 --enable-libxvid --disable-libcdio --disable-libiec61883 --disable-libdc1394 --di  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[x11grab @ 0x6494f0] device: :0.0+0,0 -> display: :0.0 x: 0 y: 0 width: 1366 height: 768
[x11grab @ 0x6494f0] shared memory extension found
[x11grab @ 0x6494f0] Estimating duration from bitrate, this may be inaccurate
Input #0, x11grab, from ':0.0+0,0':
  Duration: N/A, start: 1379098744.806607, bitrate: 1007124 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 1007124 kb/s, 30 tbr, 1000k tbn, 30 tbc
[alsa @ 0x65f2a0] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1379098744.649119, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[NULL @ 0x695b60] Unable to find a suitable output format for ' '
 : Invalid argument
./stream: line 35: -f: command not found