Record video from webcam using ffmpeg

video-record.sh

#!/bin/sh

LEN=10	# video length in seconds
SLEEP=3	# sleep time in seconds
SAVEDIR="/tmp/camera"

CAMERA=$1

# How to use thi script
[ -z "$CAMERA" ] && echo "Usage: $0 /dev/videoX  ## where X is [0..n]" && exit

# Check device name
CHK=$(echo $CAMERA | grep '^/dev/video')
[ -z "$CHK" ] && \
echo "Hm? camera device should be in /dev/videoX, are you sure that '$CAMERA' is correct?" && \
exit

# Get only the number part of device
CNO=$(echo $CAMERA | sed -e 's|/dev/video||')

[ ! -d "${SAVEDIR}" ] && mkdir -p ${SAVEDIR}
[ ! -d "${SAVEDIR}" ] && echo "Can't create '${SAVEDIR}' directory" && exit

while true; do
	find ${SAVEDIR} -type f -name \*.mp4 -mtime +3 -exec rm -vf {} \;

	D=$(date +%Y%m%d%H%M%S)
	FILE="C${CNO}${D}.mp4"

	printf "Recording ${SAVEDIR}/${FILE} ... "
	ffmpeg -i ${CAMERA} -v 0 -t ${LEN} ${SAVEDIR}/${FILE}
	printf "Done!\n"
	printf "Sleep for $SLEEP secs\r"
	sleep $SLEEP
done