Convert avi files in a folder to webm

webm_convert.sh

#!/bin/sh
COUNT=$(ps ax | grep avconv | wc -l)
if [ $COUNT -gt 1 ]; then
	echo "running already"
	exit 0
fi

i=1

while [ $i -le 3 ]; do
	FILE=$(find /var/www/html/ -name "*.avi" | head -n $i | tail -n 1 )
	WRITING=$(lsof | grep $FILE | wc -l)

	if [ $WRITING -eq "0" ]; then
		WEBM=$(echo $FILE | sed -e "s/avi/webm/g")

		/usr/bin/avconv -i $FILE $WEBM -y
		rm $FILE
		break
	fi
done