ffmpeg -f x11grab -s 1920x1080 -r 60 -i :0.0 -f jack -i default -ac 2 -c:v libx264 -preset fast -pix_fmt yuv420p -s 1280x960 -ar 44100 -threads 0 -f flv "rtmp://live.twitch.tv/app/***************"
ffmpeg version git-2013-02-02-985e93a Copyright (c) 2000-2013 the FFmpeg developers
  built on Feb  2 2013 00:41:19 with gcc 4.7.2 (GCC)
  configuration: --prefix=/usr --enable-gpl --enable-libass --enable-libfaac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 17.100 / 52. 17.100
  libavcodec     54. 91.100 / 54. 91.100
  libavformat    54. 61.104 / 54. 61.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 35.100 /  3. 35.100
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[x11grab @ 0x1b21e80] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1920 height: 1080
[x11grab @ 0x1b21e80] shared memory extension found
[x11grab @ 0x1b21e80] Estimating duration from bitrate, this may be inaccurate
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1359763061.496809, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, -2147483 kb/s, 60 tbr, 1000k tbn, 60 tbc
[jack @ 0x1b3f860] JACK client registered and activated (rate=48000Hz, buffer_size=1024 frames)
[jack @ 0x1b3f860] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, jack, from 'default':
  Duration: N/A, start: 1359763061.585473, bitrate: 3072 kb/s
    Stream #1:0: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s
[libx264 @ 0x1b5ffa0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x1b5ffa0] profile High, level 4.2
[libx264 @ 0x1b5ffa0] 264 - core 128 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 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=-2 threads=6 lookahead_threads=1 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 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, flv, to 'rtmp://live.twitch.tv/app/live_39917883_izt5fDyoTmv9LghtoHDcqLPx32hX8a':
  Metadata:
    encoder         : Lavf54.61.104
    Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p, 1280x960, q=-1--1, 1k tbn, 60 tbc
    Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
  Stream #1:0 -> #0:1 (pcm_f32le -> libmp3lame)
Press [q] to stop, [?] for help
[jack @ 0x1b3f860] Audio packet xrun
Audio packet xrun11 q=31.0 size=     269kB time=00:00:00.34 bitrate=6471.8kbits/s
[jack @ 0x1b3f860] Audio packet xrun
Audio packet xrun17 q=31.0 size=     432kB time=00:00:02.35 bitrate=1503.3kbits/s
[jack @ 0x1b3f860] Audio packet xrun
Audio packet xrun17 q=31.0 size=     436kB time=00:00:02.43 bitrate=1468.2kbits/s
[jack @ 0x1b3f860] Audio packet xrun
    Last message repeated 6 times
Audio packet xrun18 q=31.0 size=     442kB time=00:00:02.66 bitrate=1355.9kbits/s
[jack @ 0x1b3f860] Audio packet xrun
^Cframe=  206 fps= 15 q=-1.0 Lsize=     607kB time=00:00:03.39 bitrate=1462.7kbits/s
video:589kB audio:14kB subtitle:0 global headers:0kB muxing overhead 0.615857%
[libx264 @ 0x1b5ffa0] frame I:1     Avg QP:22.86  size: 77142
[libx264 @ 0x1b5ffa0] frame P:58    Avg QP:20.65  size:  7922
[libx264 @ 0x1b5ffa0] frame B:147   Avg QP:26.76  size:   447
[libx264 @ 0x1b5ffa0] consecutive B-frames:  4.4%  1.0%  1.5% 93.2%
[libx264 @ 0x1b5ffa0] mb I  I16..4: 56.8%  9.9% 33.3%
[libx264 @ 0x1b5ffa0] mb P  I16..4:  2.0%  0.1%  1.7%  P16..4:  3.5%  0.6%  0.5%  0.0%  0.0%    skip:91.5%
[libx264 @ 0x1b5ffa0] mb B  I16..4:  0.1%  0.0%  0.1%  B16..8:  0.3%  0.1%  0.0%  direct: 0.4%  skip:99.0%  L0:56.7% L1:37.9% BI: 5.4%
[libx264 @ 0x1b5ffa0] 8x8 transform intra:5.6% inter:23.9%
[libx264 @ 0x1b5ffa0] coded y,uvDC,uvAC intra: 35.4% 36.1% 29.9% inter: 0.6% 0.5% 0.1%
[libx264 @ 0x1b5ffa0] i16 v,h,dc,p: 70% 28%  1%  0%
[libx264 @ 0x1b5ffa0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 15% 38%  2%  3%  4%  2%  3%  5%
[libx264 @ 0x1b5ffa0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 20% 17%  3%  5%  6%  4%  5%  5%
[libx264 @ 0x1b5ffa0] i8c dc,h,v,p: 61% 21% 17%  1%
[libx264 @ 0x1b5ffa0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x1b5ffa0] ref P L0: 75.0% 25.0%
[libx264 @ 0x1b5ffa0] ref B L0: 81.3% 18.7%
[libx264 @ 0x1b5ffa0] ref B L1: 96.9%  3.1%
[libx264 @ 0x1b5ffa0] kb/s:1403.50
Received signal 2: terminating.