Local machine:

ffmpeg -f alsa -i plughw:CARD=Intel,DEV=0 -f video4linux2 -s vga -i /dev/video0 -f mpegts pipe:1 | sudo netcat ...

ffmpeg version 2.2.git-66e30a2 Copyright (c) 2000-2014 the FFmpeg developers
  built on Apr 30 2014 11:16:55 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libx264 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
  libavutil      52. 79.100 / 52. 79.100
  libavcodec     55. 59.100 / 55. 59.100
  libavformat    55. 37.101 / 55. 37.101
  libavdevice    55. 13.100 / 55. 13.100
  libavfilter     4.  4.100 /  4.  4.100
  libavresample   1.  2.  0 /  1.  2.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, alsa, from 'plughw:CARD=Intel,DEV=0':
  Duration: N/A, start: 1398962566.002048, bitrate: 1536 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[video4linux2,v4l2 @ 0x1b5dea0] Time per frame unknown
Input #1, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 44794.413853, bitrate: N/A
    Stream #1:0: Video: mjpeg, yuvj422p(pc), 640x480, 30 tbr, 1000k tbn, 1000k tbc
[swscaler @ 0x1b42b40] deprecated pixel format used, make sure you did set range correctly
No pixel format specified, yuv422p for MPEG-2 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
Output #0, mpegts, to 'pipe:1':
  Metadata:
    encoder         : Lavf55.37.101
    Stream #0:0: Video: mpeg2video, yuv422p, 640x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc
    Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (mjpeg -> mpeg2video)
  Stream #0:0 -> #0:1 (pcm_s16le -> mp2)
Press [q] to stop, [?] for help
[alsa @ 0x1b4ada0] ALSA buffer xrun.
frame=  597 fps= 31 q=27.7 Lsize=    1931kB time=00:00:20.03 bitrate= 789.4kbits/s dup=1 drop=0
video:793kB audio:897kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 14.275245%

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Remote computer:

sudo nc -l -p 110 | avconv -v verbose -r 30 -s 640x480 -f rawvideo -i - http://localhost/webcam.ffm

avconv version 0.8.10-6:0.8.10-1, Copyright (c) 2000-2013 the Libav developers
  built on Feb  5 2014 03:52:19 with gcc 4.7.2
  configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.10-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  libavutil    51. 22. 2 / 51. 22. 2
  libavcodec   53. 35. 0 / 53. 35. 0
  libavformat  53. 21. 1 / 53. 21. 1
  libavdevice  53.  2. 0 / 53.  2. 0
  libavfilter   2. 15. 0 /  2. 15. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  52.  0. 0 / 52.  0. 0
[rawvideo @ 0x643d00] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 640x480, 30 tbr, 30 tbn, 30 tbc
[buffer @ 0x632ca0] w:640 h:480 pixfmt:yuv420p
Output #0, ffm, to 'http://localhost/webcam.ffm':
  Metadata:
    encoder         : Lavf53.21.1
    Stream #0.0: Video: mpeg1video, yuv420p, 640x480, q=2-31, 200 kb/s, 1000k tbn, 30 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> mpeg1video)
Press ctrl-c to stop encoding
frame=    8 fps=  0 q=24.8 size=    1448kB time=0.23 bitrate=50837.1kbits/s