bashrc ffmpeg command 2

streaming() {
INRES="640x480" # input resolution
OUTRES="640x480"
FPS="30" # target FPS
QUAL="fast"  # one of the many FFMPEG preset
#STREAM_KEY="$1"
STREAM_KEY="live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
#URL="rtmp://live.justin.tv/app/$STREAM_KEY" #flashver=FMLE/3.0\20(compatible;\20FMSc/1.0)"
URL="rtmp://live.twitch.tv/app/$STREAM_KEY" #flashver=FMLE/3.0\20(compatible;\20FMSc/1.0)"

ffmpeg -f v4l2 -s "$INRES" -r "$FPS" -i /dev/video0 \
    -f alsa -ac 2 -i hw:2 -vcodec libx264 -crf 30 -preset "$QUAL" -s "640x480" \
    -acodec libmp3lame -ab 128k -ar 44100 -threads 0 \
    -f flv "$URL"
}