ffmpeg output

ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1024x768 -i :0.0  -acodec pcm_s16le -vcodec libx264 -preset ultrafast -crf 0 -threads 1  output.mkv
ffmpeg version 1.2.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Aug  4 2013 08:24:19 with gcc 4.8.1 (GCC) 20130603 (Red Hat 4.8.1-1)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  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
[alsa @ 0xf9f980] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, alsa, from 'pulse':
  Duration: N/A, start: 1381098576.176447, bitrate: 1536 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[x11grab @ 0xfb6ea0] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1024 height: 768
[x11grab @ 0xfb6ea0] shared memory extension found
[x11grab @ 0xfb6ea0] Estimating duration from bitrate, this may be inaccurate
Input #1, x11grab, from ':0.0':
  Duration: N/A, start: 1381098576.240901, bitrate: 754974 kb/s
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x768, 754974 kb/s, 30 tbr, 1000k tbn, 30 tbc
[libx264 @ 0xfd16a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle
[libx264 @ 0xfd16a0] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
[libx264 @ 0xfd16a0] 264 - core 130 r2282 1db4621 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, matroska, to 'output.mkv':
  Metadata:
    encoder         : Lavf54.63.104
    Stream #0:0: Video: h264 (H264 / 0x34363248), yuv444p, 1024x768, q=-1--1, 1k tbn, 30 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo -> libx264)
  Stream #0:0 -> #0:1 (pcm_s16le -> pcm_s16le)
Press [q] to stop, [?] for help
frame= 1204 fps= 14 q=0.0 Lsize=   13844kB time=00:00:40.30 bitrate=2813.4kbits/s
video:9999kB audio:3733kB subtitle:0 global headers:0kB muxing overhead 0.809491%
[libx264 @ 0xfd16a0] frame I:5     Avg QP: 0.00  size:150727
[libx264 @ 0xfd16a0] frame P:1199  Avg QP: 0.00  size:  7911
[libx264 @ 0xfd16a0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0xfd16a0] mb P  I16..4: 69.9%  0.0%  0.0%  P16..4:  1.7%  0.0%  0.0%  0.0%  0.0%    skip:28.3%
[libx264 @ 0xfd16a0] coded y,u,v intra: 0.8% 0.8% 0.8% inter: 0.8% 0.8% 0.8%
[libx264 @ 0xfd16a0] i16 v,h,dc,p: 98%  2%  0%  0%
[libx264 @ 0xfd16a0] kb/s:2040.98