BBB
  * ffmpeg running
    * CPU 45%
    * RES 8796
    * ffmpeg -s 320x240 -f video4linux2 -i /dev/video0 -f mpeg1video -b 400k -t 1:00:00 -r 30 -pix_fmt yuv420p http://host  

  * power
    * 2 watts w/ ethernet
    * 3 watts w/ usb cam
    * 3 watts ffmpeg running

rPi

  * ffmpeg  0.8.6-6:0.8.6-1+rpi1 / Lavf53.21.1 
    * ffmpeg -s 320x240 -f video4linux2 -i /dev/video0 -f mpeg1video -b 400k -r 30 -pix_fmt yuyv422 http://host
    * anysize 400k stream was constant fail
    * 320x240 200k stream is good 97% cpu
    * 320x240 100k stream is good 80% cpu
    * 640x480  50k was fail

  * power
    * 2 watts w/ ethernet
    * 3 watts w/ usb cam