]# ffmpeg -y -i uploads/videos/140.flv -acodec libfaac -vcodec libx264 -maxrate 3000k -bufsize 4000k -s 854x480 -qscale 12 -r 25 -ar 44100 -ab 96 -vpre medium -s 854x480 tmp/1335794424.flv
FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  built on Apr 18 2012 05:19:10 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  configuration: --prefix=/usr/local/src/ffmpeg --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-libdirac --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab --enable-libxvid --enable-libvorbis --enable-libtheora
  libavutil     50.36. 0 / 50.36. 0
  libavcore      0.16. 1 /  0.16. 1
  libavcodec    52.108. 0 / 52.108. 0
  libavformat   52.93. 0 / 52.93. 0
  libavdevice   52. 2. 3 / 52. 2. 3
  libavfilter    1.74. 0 /  1.74. 0
  libswscale     0.12. 0 /  0.12. 0
  libpostproc   51. 2. 0 / 51. 2. 0
[flv @ 0xe2a99a0] Estimating duration from bitrate, this may be inaccurate

Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.92 (359/12)
Input #0, flv, from 'uploads/videos/140.flv':
  Metadata:
    duration        : 46
    starttime       : 0
    totalduration   : 46
    width           : 400
    height          : 224
    videodatarate   : 249
    audiodatarate   : 25
    totaldatarate   : 283
    framerate       : 30
    bytelength      : 1640495
    canseekontime   : true
    sourcedata      : B4A7D64A5HH1312199437857390
    purl            :
    pmsg            :
  Duration: 00:00:46.34, start: 0.000000, bitrate: 281 kb/s
    Stream #0.0: Video: flv, yuv420p, 400x224, 255 kb/s, 29.92 tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: mp3, 22050 Hz, 2 channels, s16, 26 kb/s
WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s
File for preset 'medium' not found