PiCam Time Lapse Maker w/ ffmpeg

lapse.sh

#!/bin/bash

# PREREQUISITES
#
# fswebcam (sudo apt-get install fswebcam)
# imagemagick (sudo apt-get install fswebcam)
# lighttpd (sudo apt-get install lighttpd)
# ffmpeg (wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-armhf-static.tar.xz)
#

IMG_DIR=/home/pi/webcam/images

if [ ! -d $IMG_DIR ]; then
	mkdir -p $IMG_DIR
fi

etime=$(date +%s)

RAW_FILE="$IMG_DIR/${etime}_raw.jpg"
TXT_FILE="$IMG_DIR/${etime}_text.jpg"
GIF_FILE="$IMG_DIR/lapse_out.gif"
PUB_FILE="$IMG_DIR/lapse.gif"
NEW_FILE="$IMG_DIR/latest.jpg"

rm $TXT_FILE >/dev/null 2>&1

echo -n "Capturing ..."
while [ ! -f $TXT_FILE ]
do
  fswebcam -r 2560x1960 --no-banner $RAW_FILE >/dev/null 2>&1

  if [[ -f $RAW_FILE ]]; then
    echo
    echo "Rotating"
    mogrify -rotate 270 $RAW_FILE  >/dev/null 2>&1
    echo "Overlaying Text"
    dtime=$(date +"%H:%M:%S")
    convert -pointsize 40 -fill black -draw "text 30 50 '$dtime' " $RAW_FILE $TXT_FILE  >/dev/null 2>&1

    if [[ ! -f $TXT_FILE ]]; then
      echo -n "."
      sleep 1
    else

     echo "Publishing Latest Image"
     cp $TXT_FILE $NEW_FILE.tmp
     mv $NEW_FILE.tmp $NEW_FILE

     echo "Deleted outdated images"
     find $IMG_DIR -mmin +1440 -type f -name "*.jpg"  -exec rm -f {} \;
     rm $RAW_FILE >/dev/null 2>&1

     echo "Generating Animation"
     ffmpeg -framerate 60 -pattern_type glob -i "$IMG_DIR/*_text.jpg" -vf scale=512:-1 $GIF_FILE
     mv $GIF_FILE $PUB_FILE
    fi
  fi
done