root@en-ye2:/opt/ffmpeg/ffmpeg-git-20161208-64bit-static# ./ffmpeg ffmpeg -i udp://192.168.4.12:1018 -preset fast -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 96k -vcodec libx264  -b:v 1500k -maxrate 1500k -bufsize 4000k -g 60 -f flv rtmp://192.168.17.11/CNN_236/CNN -loglevel debug
ffmpeg version N-82796-g120471d-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.4.1 (Debian 5.4.1-4) 20161202
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  libavutil      55. 42.100 / 55. 42.100
  libavcodec     57. 67.100 / 57. 67.100
  libavformat    57. 58.102 / 57. 58.102
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 68.100 /  6. 68.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Splitting the commandline.
Reading option 'ffmpeg' ... matched as output url.
Reading option '-i' ... matched as input url with argument 'udp://192.168.4.12:1018'.
Reading option '-preset' ... matched as AVOption 'preset' with argument 'fast'.
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'aac'.
Reading option '-strict' ...Routing option strict to both codec and muxer layer
 matched as AVOption 'strict' with argument 'experimental'.
Reading option '-ar' ... matched as option 'ar' (set audio sampling rate (in Hz)) with argument '44100'.
Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '2'.
Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '96k'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'libx264'.
Reading option '-b:v' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '1500k'.
Reading option '-maxrate' ... matched as AVOption 'maxrate' with argument '1500k'.
Reading option '-bufsize' ... matched as AVOption 'bufsize' with argument '4000k'.
Reading option '-g' ... matched as AVOption 'g' with argument '60'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'flv'.
Reading option 'rtmp://192.168.17.11/CNN_236/CNN' ... matched as output url.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url udp://192.168.4.12:1018.
Successfully parsed a group of options.
Opening an input file: udp://192.168.4.12:1018.
[udp @ 0x404d840] No default whitelist set
[udp @ 0x404d840] end receive buffer size reported is 131072
[AVIOContext @ 0x406dd20] Statistics: 0 bytes read, 0 seeks