tgp video # ffmpeg -i 4647-origin.mp4 -vcodec libx264 -vprofile high -preset slow -b:v 700k -maxrate 800k -bufsize 1000k -vf scale=-1:432 -threads 4 -b:a 128k 4647-conv.mp4
ffmpeg version 0.10.6 Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec 22 2012 11:57:43 with gcc 4.5.4
  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 -msse -msse2 -msse3 -march=core2' --extra-cflags='-O2 -pipe -msse -msse2 -msse3 -march=core2' --extra-cxxflags='-O2 -pipe -msse -msse2 -msse3 -march=core2' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --disable-stripping --disable-debug --disable-doc --disable-network --disable-vaapi --disable-vdpau --disable-zlib --disable-bzlib --disable-ffplay --enable-libmp3lame --enable-libvo-aacenc --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libfaac --enable-nonfree --disable-indev=v4l --disable-indev=v4l2 --disable-indev=alsa --disable-indev=oss --disable-indev=jack --disable-outdev=alsa --disable-outdev=oss --disable-outdev=sdl --enable-libfreetype --enable-pthreads --enable-libvpx --disable-amd3dnow --disable-amd3dnowext --  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '4647-origin.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2013-03-02 14:13:38
  Duration: 00:07:59.53, start: 0.000000, bitrate: 842 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 768x432 [SAR 3:4 DAR 4:3], 802 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Metadata:
      creation_time   : 2013-03-02 14:13:38
      handler_name    :
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 32000 Hz, mono, s16, 32 kb/s
    Metadata:
      creation_time   : 2013-03-02 14:13:38
      handler_name    :
[buffer @ 0x7f2a26928c20] w:768 h:432 pixfmt:yuv420p tb:1/1000000 sar:3/4 sws_param:
[scale @ 0x7f2a2692b660] w:768 h:432 fmt:yuv420p -> w:768 h:432 fmt:yuv420p flags:0x4
[libx264 @ 0x7f2a269295f0] using SAR=3/4
[libx264 @ 0x7f2a269295f0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[libx264 @ 0x7f2a269295f0] profile High, level 3.0
[libx264 @ 0x7f2a269295f0] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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=4 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1 bitrate=700 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=800 vbv_bufsize=1000 nal_hrd=none ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '4647-conv.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2013-03-02 14:13:38
    encoder         : Lavf53.32.100
    Stream #0:0(und): Video: h264 (![0][0][0] / 0x0021), yuv420p, 768x432 [SAR 3:4 DAR 4:3], q=-1--1, 700 kb/s, 30k tbn, 29.97 tbc
    Metadata:
      creation_time   : 2013-03-02 14:13:38
      handler_name    :
    Stream #0:1(und): Audio: aac (@[0][0][0] / 0x0040), 32000 Hz, mono, s16, 128 kb/s
    Metadata:
      creation_time   : 2013-03-02 14:13:38
      handler_name    :
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (aac -> libfaac)
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