Streaming to justin.tv with ffmpeg in linux

screenstream.sh

#!/bin/sh -xe

INFO=$(xwininfo -frame)
API_KEY="YOUR_API_KEY_GOES_HERE"

WIN_GEO=$(echo $INFO | grep -oEe 'geometry [0-9]+x[0-9]+' | grep -oEe '[0-9]+x[0-9]+')
WIN_XY=$(echo $INFO | grep -oEe 'Corners:\s+\+[0-9]+\+[0-9]+' | grep -oEe '[0-9]+\+[0-9]+' | sed -e 's/\+/,/' )
FPS="15"

INRES='1680x1010'
OUTRES='1280x720'

ffmpeg -f x11grab -s "$INRES" -r "$FPS" -i :0.0+$WIN_XY \
    -f alsa -ac 2 -i default -vcodec libx264  -s "$OUTRES"  \
    -acodec libmp3lame -ab 128k -ar 44100 -threads 0 \
    -f flv "rtmp://live.justin.tv/app/$API_KEY"

Original version of this script was provided by @rtyler on his blog.