ffmpeg -re -i xx.mkv -f flv -ar 44100 rtmp://x.org/live/x
ffmpeg version N-47342-g5473f62 Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec  1 2012 14:30:43 with gcc 4.4.5 (Debian 4.4.5-8)
  configuration: --disable-shared --enable-static --prefix=/x/ --extra-ldflags=-I/x/include --extra-ldflags=-L/x/lib --extra-cflags=-I/x/include --enable-gpl --enable-libaacplus --enable-libmp3lame --enable-librtmp --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-vdpau --enable-bzlib --enable-pthreads --enable-zlib --disable-stripping --enable-runtime-cpudetect --enable-postproc --enable-swscale
  libavutil      52. 10.100 / 52. 10.100
  libavcodec     54. 78.100 / 54. 78.100
  libavformat    54. 41.100 / 54. 41.100
  libavdevice    54.  3.101 / 54.  3.101
  libavfilter     3. 23.104 /  3. 23.104
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.101 /  0. 17.101
  libpostproc    52.  2.100 / 52.  2.100
Input #0, matroska,webm, from 'xx.mkv':
  Metadata:
    creation_time   : 2012-11-25 17:25:50
  Duration: 00:21:11.85, start: 0.000000, bitrate: 1700 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x720, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s (default)
Output #0, flv, to 'rtmp://x.org/live/x':
  Metadata:
    encoder         : Lavf54.41.100
    Stream #0:0(eng): Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 1k tbn, 23.98 tbc
    Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> flv)
  Stream #0:1 -> #0:1 (ac3 -> libmp3lame)
Press [q] to stop, [?] for help
frame=16216 fps= 24 q=31.0 size=  102508kB time=00:11:17.06 bitrate=1240.3kbits/s