Raspberry Pi stream to youtube

#!/bin/bash

exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3
exec 1>>/var/log/streamToYoutbue.log 2>&1

set -x

YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2/"
FFMPEG="/usr/local/ffmpeg/bin/ffmpeg"

function usage() {
        echo "usage:"
        echo "streamToYoutbue youtube-channel-id"
        exit 1
}

function startStreaming() {
        echo "start streaming to youtube channel $1"
        date
        raspivid -o - -t 0 -w 1280 -h 720 -fps 25 -b 4000000 -g 50 | "$FFMPEG"  -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv "$YOUTUBE_URL$1"
}

if [ -z "$1" ]; then
        usage
else
        startStreaming $1
fi