$ /usr/bin/ffmpeg -i 4636_480p.mp4 -vf scale=428:240 -b:v 200k -vcodec libx264 -acodec libfaac -ac 2 -ar 44100 -b:a 64k -async 1 -preset slow -threads 8 4636_240_6a2fhlywd8.mp4


ffmpeg version N-54841-g1f7acf3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jul 21 2013 00:30:39 with gcc 4.4.6 (GCC) 20110731 (Red Hat 4.4.6-3)
  configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl --enable-postproc --enable-nonfree
  libavutil      52. 40.100 / 52. 40.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.102 / 55. 12.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 81.102 /  3. 81.102
  libswscale      2.  4.100 /  2.  4.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/trill/m3new/4636_480p.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2013-10-06 04:59:16
  Duration: 00:03:30.14, start: 0.000000, bitrate: 674 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360, 575 kb/s, 23.98 fps, 23.98 tbr, 48k tbn, 47.95 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s
    Metadata:
      creation_time   : 2013-10-06 04:59:25
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
-async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.
[libx264 @ 0x2ce12e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x2ce12e0] profile High, level 2.1
[libx264 @ 0x2ce12e0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - 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=8 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=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1 bitrate=200 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '4636_240_6a2fhlywd8.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf55.12.102
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 428x240, q=-1--1, 200 kb/s, 24k tbn, 23.98 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 64 kb/s
    Metadata:
      creation_time   : 2013-10-06 04:59:25
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (aac -> libfaac)
Press [q] to stop, [?] for help
frame= 5038 fps= 67 q=-1.0 Lsize=    6386kB time=00:03:30.14 bitrate= 249.0kbits/s
video:4587kB audio:1641kB subtitle:0 global headers:0kB muxing overhead 2.531257%
[libx264 @ 0x2ce12e0] frame I:152   Avg QP:28.61  size:  5775
[libx264 @ 0x2ce12e0] frame P:1709  Avg QP:31.38  size:  1349
[libx264 @ 0x2ce12e0] frame B:3177  Avg QP:33.49  size:   476
[libx264 @ 0x2ce12e0] consecutive B-frames: 10.5%  8.7% 22.9% 58.0%
[libx264 @ 0x2ce12e0] mb I  I16..4: 13.2% 62.4% 24.4%
[libx264 @ 0x2ce12e0] mb P  I16..4:  2.9%  8.6%  1.5%  P16..4: 35.3% 11.7%  4.8%  0.0%  0.0%    skip:35.1%
[libx264 @ 0x2ce12e0] mb B  I16..4:  0.4%  1.2%  0.2%  B16..8: 33.3%  5.2%  0.7%  direct: 0.9%  skip:58.2%  L0:42.2% L1:54.1% BI: 3.6%
[libx264 @ 0x2ce12e0] final ratefactor: 28.86
[libx264 @ 0x2ce12e0] 8x8 transform intra:65.3% inter:77.3%
[libx264 @ 0x2ce12e0] direct mvs  spatial:99.3% temporal:0.7%
[libx264 @ 0x2ce12e0] coded y,uvDC,uvAC intra: 54.0% 52.4% 16.6% inter: 7.5% 4.7% 0.1%
[libx264 @ 0x2ce12e0] i16 v,h,dc,p: 29% 31% 10% 30%
[libx264 @ 0x2ce12e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 12% 13%  7% 10% 11% 12%  9% 11%
[libx264 @ 0x2ce12e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 13%  9%  7% 11% 11% 11%  9% 12%
[libx264 @ 0x2ce12e0] i8c dc,h,v,p: 50% 21% 18% 10%
[libx264 @ 0x2ce12e0] Weighted P-Frames: Y:4.6% UV:3.5%
[libx264 @ 0x2ce12e0] ref P L0: 68.9% 11.0% 12.7%  3.2%  3.1%  1.1%  0.1%
[libx264 @ 0x2ce12e0] ref B L0: 91.6%  5.9%  2.0%  0.6%
[libx264 @ 0x2ce12e0] ref B L1: 97.1%  2.9%
[libx264 @ 0x2ce12e0] kb/s:178.82