[ec2-user@ip-10-196-31-62 logs]$ sudo ffmpeg -i /usr/local/WowzaMediaServer/content/live_streaming.flv -acodec libfaac -keyint_min 20 -r 20 -vcodec libx264 -crf 25 -b 300k -bt 300k -y -bf 16  -threads 0 /tmp/live_streaming.mp4
ffmpeg version 1.1.3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Mar  6 2013 16:14:42 with gcc 4.6.2 (GCC) 20111027 (Red Hat 4.6.2-2)
  configuration: --disable-ffserver --disable-ffplay --enable-gpl --enable-postproc --enable-nonfree --enable-version3 --enable-postproc --enable-libspeex --enable-avfilter --enable-pthreads --enable-libx264 --enable-libmp3lame --enable-libfaac
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 86.100 / 54. 86.100
  libavformat    54. 59.106 / 54. 59.106
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.100 /  3. 32.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, flv, from '/usr/local/WowzaMediaServer/content/live_streaming.flv':
  Metadata:
    creationdate    : Wed Mar 6 14:27:21
  Duration: 00:01:16.38, start: 0.000000, bitrate: 16 kb/s
    Stream #0:0: Video: h264 (Baseline), yuv420p, 176x132 [SAR 1:1 DAR 4:3], 5 tbr, 1k tbn, 60 tbc
    Stream #0:1: Audio: speex, 16000 Hz, mono, s16
Please use -b:a or -b:v, -b is ambiguous
[libx264 @ 0x2f867c0] using SAR=1/1
[libx264 @ 0x2f867c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x2f867c0] profile High, level 1.1
[libx264 @ 0x2f867c0] 264 - core 130 r2274 c832fe9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=16 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=20 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=25.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[libfaac @ 0x2f86c20] libfaac doesn't support this output format!
Output #0, mp4, to '/tmp/live_streaming.mp4':
  Metadata:
    creationdate    : Wed Mar 6 14:27:21
    Stream #0:0: Video: h264, yuv420p, 176x132 [SAR 1:1 DAR 4:3], q=-1--1, 300 kb/s, 90k tbn, 20 tbc
    Stream #0:1: Audio: aac, 16000 Hz, mono, s16, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (libspeex -> libfaac)
Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height