ffmpeg -i defy.flv -v verbose -pass 1 -passlogfile 6412 -an -vb 256k -vcodec libx264 -profile:v high -profile high -level 30 -f rawvideo -y /dev/null
ffmpeg version N-38263-g305e4b3 Copyright (c) 2000-2012 the FFmpeg developers
  built on Feb 26 2012 11:20:51 with gcc 4.4.5
  configuration: --enable-version3 --enable-libvo-aacenc --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-libopenjpeg --enable-libgsm --enable-libxvid --enable-libfaac --enable-pthreads --enable-libvorbis --enable-gpl --enable-x11grab --enable-nonfree --enable-avfilter --optflags='-O3 -march=native -mtune=native'
  libavutil      51. 41.100 / 51. 41.100
  libavcodec     54.  4.100 / 54.  4.100
  libavformat    54.  1.100 / 54.  1.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 62.101 /  2. 62.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  7.100 /  0.  7.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, flv, from 'defy.flv':
  Metadata:
    starttime       : 0
    totalduration   : 61
    totaldatarate   : 1170
    bytelength      : 8913665
    canseekontime   : true
    sourcedata      : B4A7DA8ACHH1330089282160433
    purl            :
    pmsg            :
  Duration: 00:01:00.96, start: 0.000000, bitrate: 1169 kb/s
    Stream #0:0: Video: h264 (Main), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 1091 kb/s, 25 tbr, 1k tbn, 50 tbc
    Stream #0:1: Audio: aac, 44100 Hz, stereo, s16, 97 kb/s
[buffer @ 0x182c260] w:854 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
[libx264 @ 0x18291c0] using SAR=1/1
[libx264 @ 0x18291c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[libx264 @ 0x18291c0] profile Main, level 3.0
Output #0, rawvideo, to '/dev/null':
  Metadata:
    starttime       : 0
    totalduration   : 61
    totaldatarate   : 1170
    bytelength      : 8913665
    canseekontime   : true
    sourcedata      : B4A7DA8ACHH1330089282160433
    purl            :
    pmsg            :
    encoder         : Lavf54.1.100
    Stream #0:0: Video: h264, yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=-1--1, pass 1, 256 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
Press [q] to stop, [?] for help
frame= 1525 fps=234 q=-1.0 Lsize=       0kB time=00:01:00.92 bitrate=   0.0kbits/s
video:1726kB audio:0kB global headers:0kB muxing overhead -100.000000%
[libx264 @ 0x18291c0] frame I:54    Avg QP:36.42  size:  4899
[libx264 @ 0x18291c0] frame P:1083  Avg QP:40.58  size:  1262
[libx264 @ 0x18291c0] frame B:388   Avg QP:43.03  size:   351
[libx264 @ 0x18291c0] consecutive B-frames: 58.6% 19.1% 10.2% 12.1%
[libx264 @ 0x18291c0] mb I  I16..4: 88.8%  0.0% 11.2%
[libx264 @ 0x18291c0] mb P  I16..4: 18.4%  0.0%  0.0%  P16..4: 13.5%  0.0%  0.0%  0.0%  0.0%    skip:68.1%
[libx264 @ 0x18291c0] mb B  I16..4:  0.9%  0.0%  0.0%  B16..8:  6.8%  0.0%  0.0%  direct: 0.8%  skip:91.5%  L0:44.4% L1:52.0% BI: 3.6%
[libx264 @ 0x18291c0] final ratefactor: 37.41
[libx264 @ 0x18291c0] coded y,uvDC,uvAC intra: 5.7% 27.0% 3.3% inter: 1.1% 2.9% 0.1%
[libx264 @ 0x18291c0] i16 v,h,dc,p: 44% 30% 18%  9%
[libx264 @ 0x18291c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 21% 29%  6%  5%  4%  4%  4%  4%
[libx264 @ 0x18291c0] i8c dc,h,v,p: 81% 10%  8%  1%
[libx264 @ 0x18291c0] Weighted P-Frames: Y:3.1% UV:2.4%
[libx264 @ 0x18291c0] kb/s:231.77