$ ffmpeg -i bf3-2012-02-13-21-58-59-24.avi -vcodec libx264 -preset slow -crf 18 bf3-4.mp4
ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  built on Feb 12 2012 23:50:01 with gcc 4.6.2
  configuration: --prefix=/usr/local/ffmpeg --enable-openal --enable-libxvid --enable-libxavs --enable-libx264 --enable-libvpx --enable-libvo-aacenc --enable-libv4l2 --enable-libtheora --enable-libspeex --enable-libschroedinger --enable-librtmp --enable-libpulse --enable-libopenjpeg --enable-libmp3lame --enable-libmodplug --enable-libgsm --enable-libfreetype --enable-libfaac --enable-libdirac --enable-libcelt --enable-libass --enable-libaacplus --enable-gnutls --enable-bzlib --enable-nonfree --enable-gpl --enable-version3
  libavutil      51. 34.101 / 51. 34.101
  libavcodec     53. 60.100 / 53. 60.100
  libavformat    53. 31.100 / 53. 31.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 60.100 /  2. 60.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, avi, from 'bf3-2012-02-13-21-58-59-24.avi':
  Duration: 00:04:44.50, start: 0.000000, bitrate: 119286 kb/s
    Stream #0:0: Video: fraps (FPS1 / 0x31535046), yuvj420p, 1024x768, 30 fps, 30 tbr, 30 tbn, 30 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
[buffer @ 0x2f51cc0] w:1024 h:768 pixfmt:yuvj420p tb:1/1000000 sar:0/1 sws_param:
[libx264 @ 0x2f528a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[libx264 @ 0x2f528a0] profile High, level 3.1
[libx264 @ 0x2f528a0] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=6 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=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
libaacplus: bad aac setting: br:128000, AACch:2, AACsr:22050
[libaacplus @ 0x2f50e20] libaacplus doesn't support this output format!
Output #0, mp4, to 'bf3-4.mp4':
    Stream #0:0: Video: h264, yuvj420p, 1024x768, q=-1--1, 90k tbn, 30 tbc
    Stream #0:1: Audio: aac, 44100 Hz, 2 channels, s16, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (fraps -> libx264)
  Stream #0:1 -> #0:1 (pcm_s16le -> libaacplus)
Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height