makevideo

#!/bin/bash

#######################################################################
# Made by    : Ewoud Dronkert
# Licence    : GNU GPL v3
# Platform   : Raspberry Pi
# Requires   : bash, ssh access, avconv
# Location   : /usr/local/bin/
# Name       : makevideo
# Version    : 1.0.0
# Date       : 2016-08-01
# Purpose    : Create video from remote dir full of webcam jpegs.
# Parameters : none
# Settings   : SERVER = remote server holding the webcam jpegs,
#                       capable of ssh / scp / rsync
#              RDIR = remote directory containing the jpegs,
#                     also where the video will be uploaded
# Exit     0 : No errors (but rsync/ssh/touch/etc errors not monitored)
#          1 : No jpegs found
#######################################################################

# Server
SERVER="user@server"
IDFILE="/home/pi/.ssh/id_rsa"

# Remote and local directories
RDIR="remote-dir"
LDIR="/tmp"
VIDEODIR="/home/pi/Videos"

# Remote and local file name patterns, format
RPAT="[012][0-9][0-5][0-9].jpg"
LPAT="img-[0-9][0-9][0-9][0-9].jpg"
LFMT="img-%04d.jpg"

# Download webcam shots
rsync -qau -e "ssh -i '$IDFILE'" \
	"$SERVER":"$RDIR/$RPAT" \
	"$LDIR/"

# Avoid using old files for making the video
# (not all remote 'HHMM.jpg' files may heve been updated in case of upload problems)
# Assume webcam runs between 8:00 and 22:00
NOW=$(date +%-H%M)
if (( NOW >= 800 )); then
	# Webcam running or today completed, use files from today
	REF=$(date +%Y%m%d)
else
	# Use files from yesterday
	REF=$(date -d yesterday +%Y%m%d)
fi
touch -t "${REF}0000.00" "$LDIR/midnight"

# Generate consecutive numbering for all relevant files
# Save rename data in list to restore later
RENAME="$LDIR/mv.txt"
: > "$RENAME"
find "$LDIR/"$RPAT -newer "$LDIR/midnight" \
	| sort | cat -n | while read i f; do
	f=$(basename "$f")
	printf "%s $LFMT\n" "$f" "$i" >> "$RENAME"
done

# Move files temporarily for making video
rm -f "$LDIR/"$LPAT
cat "$RENAME" | while read a b; do
	mv -f "$LDIR/$a" "$LDIR/$b"
done

# Number of jpegs
n=$(ls "$LDIR/"$LPAT | wc -l)
if (( n == 0 )); then
	exit 1
fi

# Make video
VID="$VIDEODIR/webcam-$REF.mp4"
avconv -y \
	-r 4 -i "$LDIR/$LFMT" \
	-an -r 4 -c:v libx264 "$VID" \
	&>/dev/null
chown pi:pi "$VID"

# Move back jpegs
cat "$RENAME" | while read b a; do
	mv -f "$LDIR/$a" "$LDIR/$b"
done
chown pi:pi "$LDIR/"$RPAT

# Upload video
[ -r "$VID" ] && scp -p -q -i "$IDFILE" \
	"$VID" "$SERVER":"$RDIR/$REF.mp4"