img2video

#!/bin/sh

# image to video

# script usage
usage()
{
echo "\
# image to video

$(basename "$0") -i infile.(png|jpg|jpeg) -d (000) -o outfile.mp4
-i infile.(mp4|mkv|mov|m4v)
-d (000)       : duration
-o outfile.mp4 :optional agument # if option not provided defaults to infile-name-video-date-time"
exit 2
}

# error messages
NOTFILE_ERR='not a file'
INVALID_OPT_ERR='Invalid option:'
REQ_ARG_ERR='requires an argument'
WRONG_ARGS_ERR='wrong number of arguments passed to script'
NOT_MEDIA_FILE_ERR='is not a media file'

# if script is run arguments pass and check the options with getopts,
# else display script usage and exit
[ $# -gt 0 ] || usage "${WRONG_ARGS_ERR}"

# duration regex match 0.[1-9]
dur_regex='^[0-9]\{1,3\}$'

# getopts check and validate options
while getopts ':i:d:o:h' opt
do
  case ${opt} in
     i) infile="${OPTARG}"
	[ -f "${infile}" ] || usage "${infile} ${NOTFILE_ERR}";;
     d) dur="${OPTARG}"
	expr "${dur}" : "${dur_regex}" 1>/dev/null;;
     o) outfile="${OPTARG}";;
     h) usage;;
     \?) usage "${INVALID_OPT_ERR} ${OPTARG}" 1>&2;;
     :) usage "${INVALID_OPT_ERR} ${OPTARG} ${REQ_ARG_ERR}" 1>&2;;
  esac
done
shift $((OPTIND-1))

# infile, infile name and extension
infile_nopath="${infile##*/}"
infile_name="${infile_nopath%.*}"

# outfile file recording destination
outfile_default="${infile_name}-video-$(date +"%Y-%m-%d-%H-%M-%S").mp4"

# file command check input file mime type
filetype="$(file --mime-type -b "${infile}")"

# image mimetypes
png_mime='image/png'
jpg_mime='image/jpeg'

# image to video function
imgtovid () {
  ffmpeg \
  -hide_banner \
  -stats -v panic \
  -framerate 1/"${dur}" \
  -i "${infile}" \
  -c:v libx264 -crf 18 -profile:v high \
  -r 30 -pix_fmt yuv420p \
  -movflags +faststart -f mp4 \
  "${outfile:=${outfile_default}}"
}

# check the files mime type is a image
case "${filetype}" in
    ${png_mime}|${jpg_mime}) imgtovid "${infile}";;
    *) usage "${infile} ${NOT_MEDIA_FILE_ERR}";;
esac