twitch() {
STREAM_KEY="xxxxxxxxx"
INRES=1920x1080 # input resolution
OUTRES=1280x720
FPS=20 # target FPS
QUAL="superfast"  # one of the many FFMPEG preset


ffmpeg -f x11grab -s $INRES -r $FPS -i :0.0+0,0 \
 -f alsa -ac 2 -i pulse -vcodec libx264 -preset:v $QUAL -s $OUTRES \
 -acodec libmp3lame -ab 96k -ar 44100 -threads 0  \
 -f flv rtmp://live.justin.tv/app/$STREAM_KEY

}