dv@localhost:~/cata$ /opt/dv/src/ffmpeg-git/ffmpeg -f x11grab -r 30 -s hd720 -i :0.0+231,153 -f alsa -i hw:0 -acodec pcm_s16le -vcodec libx264 -q 0 -y cata1.mkv
ffmpeg version N-52043-g43bf4ee Copyright (c) 2000-2013 the FFmpeg developers
  built on Apr 12 2013 22:51:22 with gcc 4.7 (Ubuntu/Linaro 4.7.2-22ubuntu4)
  configuration: --enable-libx264 --enable-libpulse --enable-gpl --enable-x11grab
  libavutil      52. 26.100 / 52. 26.100
  libavcodec     55.  2.100 / 55.  2.100
  libavformat    55.  2.100 / 55.  2.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 53.101 /  3. 53.101
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[x11grab @ 0x3350660] device: :0.0+231,153 -> display: :0.0 x: 231 y: 153 width: 1280 height: 720
[x11grab @ 0x3350660] shared memory extension found
Input #0, x11grab, from ':0.0+231,153':
  Duration: N/A, start: 1365841952.978375, bitrate: 884736 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1280x720, 884736 kb/s, 30 tbr, 1000k tbn, 30 tbc
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:0':
  Duration: N/A, start: 1365841952.999406, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
No pixel format specified, yuv444p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x337b820] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x337b820] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
[libx264 @ 0x337b820] 264 - core 123 r2189 35cf912 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=6 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'cata1.mkv':
  Metadata:
    encoder         : Lavf55.2.100
    Stream #0:0: Video: h264 (H264 / 0x34363248), yuv444p, 1280x720, 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 #0:0 -> #0:0 (rawvideo -> libx264)
  Stream #1:0 -> #0:1 (pcm_s16le -> pcm_s16le)
Press [q] to stop, [?] for help
frame=  199 fps= 28 q=32766.0 Lsize=    1578kB time=00:00:06.56 bitrate=1968.1kbits/s
video:340kB audio:1232kB subtitle:0 global headers:0kB muxing overhead 0.426918%
[libx264 @ 0x337b820] frame I:1     Avg QP:29.08  size:114292
[libx264 @ 0x337b820] frame P:50    Avg QP:28.42  size:  2843
[libx264 @ 0x337b820] frame B:148   Avg QP:27.63  size:   614
[libx264 @ 0x337b820] consecutive B-frames:  0.5%  1.0%  0.0% 98.5%
[libx264 @ 0x337b820] mb I  I16..4: 52.2%  7.2% 40.5%
[libx264 @ 0x337b820] mb P  I16..4:  0.2%  0.0%  0.7%  P16..4:  0.5%  0.0%  0.0%  0.0%  0.0%    skip:98.5%
[libx264 @ 0x337b820] mb B  I16..4:  0.1%  0.2%  0.1%  B16..8:  1.5%  0.0%  0.0%  direct: 0.0%  skip:97.9%  L0:61.3% L1:38.2% BI: 0.5%
[libx264 @ 0x337b820] 8x8 transform intra:19.5% inter:5.7%
[libx264 @ 0x337b820] coded y,u,v intra: 39.0% 4.8% 4.3% inter: 0.1% 0.0% 0.0%
[libx264 @ 0x337b820] i16 v,h,dc,p: 80% 15%  5%  0%
[libx264 @ 0x337b820] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  1%  4% 95%  0%  0%  0%  0%  0%  0%
[libx264 @ 0x337b820] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 18% 27%  4%  3%  3%  5%  4%  4%
[libx264 @ 0x337b820] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x337b820] ref P L0: 77.8% 11.0%  9.8%  1.4%
[libx264 @ 0x337b820] ref B L0: 47.5% 52.3%  0.2%
[libx264 @ 0x337b820] ref B L1: 98.9%  1.1%
[libx264 @ 0x337b820] kb/s:418.88
Received signal 2: terminating.