A Bash script to create timelapse videos from JPEGs in directories

timelapse_create.sh

#!/bin/bash

#title         :timelapse_create.bash
#description   :scans a directory for JPEGs and makes a timelapse .mov
#author        :"Jay Goldberg" <jaymgoldberg@gmail.com>
#url           :
#license       :Apache 2.0
#requirements  :avconv
#usage         :./timelapse_create.bash [all,hourly,daily]
#=======================================================================

##Notes
#defined dirs do not have a trailing slash
#structure of JPEGs must be <camname>/<date 0000-00-00>/<hour>/00_00_00.jpg

CAMCAP="/mnt/nfs/camshots"
KBPS=${KBPS:-2000}
CAMERAS=${CAMERAS:-$(ls $CAMCAP)}
OUTDIR="$HOME/Videos/timelapse"
FSP=${FPS:-20}

set -u

all () {
  OUTDIR="$OUTDIR/yearly"
  HOUR=${HOUR-08}
  MIN=${MIN-15} #start here and take $PERDAY forward, by minute
  PERDAY=${PERDAY-2}
  MAX=$(( $MIN + $PERDAY ))

  for camera in $CAMERAS; do
    outfile="${OUTDIR}/${camera}-${HOUR}_${MIN}-timelapse.mov"
    echo Outputting to $outfile
    if [[ ! -e $outfile ]]; then
      for date in $(ls ${CAMCAP}/${camera}); do
	  if [[ $(ls ${CAMCAP}/${camera}/${date}/${HOUR}/${HOUR}_${MIN}_*) ]]; then # at least the photos exist
	    for shot in $(eval echo "{$MIN..$MAX}"); do
	      cat ${CAMCAP}/${camera}/${date}/${HOUR}/${HOUR}_${shot}_* # 2 photos in one min will be random order
	    done
	  fi
      done | avconv -f image2pipe -c:v mjpeg -i - -r 24 -b ${KBPS}k "$outfile"
    else
      echo "file $outfile already exists"
    fi
  done
}

hourly () {
  #which hours
  #all frames?
  OUTDIR="$OUTDIR/hourly"

  for camera in $CAMERAS; do
    outfile="${OUTDIR}/${camera}-${HOUR}-timelapse.mov"
    echo Outputting to $outfile
    if [[ ! -e $outfile ]]; then
      for date in $(ls ${CAMCAP}/${camera}); do
	for hour in $(ls ${CAMCAP}/${camera}/${date}); do
	  cat ${CAMCAP}/${camera}/${date}/${hour}/*
	done
      done | avconv -f image2pipe -c:v mjpeg -i - -r 24 -b ${KBPS}k "$outfile"
    else
      echo "file $outfile already exists"
    fi
  done
}

daily () {
  OUTDIR="$OUTDIR/daily"
  #MODE: entire day or between hours
  #every frame?
  ISDATE="2014-07-11"
  DATE=${DATE:-${ISDATE}}
  HOURSTART=${HOURSTART-08}
  HOUREND=${HOUREND-19}

  for camera in $CAMERAS; do
    outfile="${OUTDIR}/${camera}-${DATE}-timelapse.mov"
    echo Outputting to $outfile
    if [[ ! -e $outfile ]]; then
        for hour in $(ls ${CAMCAP}/${camera}/${DATE}); do
  	  for jpeg in $(ls ${CAMCAP}/${camera}/${DATE}/${hour}); do
            cat ${CAMCAP}/${camera}/${DATE}/${hour}/${jpeg}
          done
        done | avconv -f image2pipe -c:v mjpeg -i - -r 24 -b ${KBPS}k "$outfile"
    else
	echo "file $outfile already exists"
    fi
  done
}

# this script can be included and also be executed
# TODO: is there a need to source this file ever?
if [ ! -z $1 ]; then
  # execute the function
  "$@"
else
  : #echo usage TODO
fi