Kodi video "poster" automatic generator for series episode and so on

vignettage_kodi.sh

#!/usr/bin/env bash

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#

#########################################
# Kodi video "poster" automatic generator
# for series episode and so on ...
#########################################

# Set defaults
ROOTPATH="$( pwd )"
INFORMAT="avi"
TIMECODE="00:02:01"
FORCE=0

# Help
displayUsage()
{
    NAME="$( basename "${0}" )"
    local CODE="${1}"
    printf "\nBy default, this program run with all AVI files in current directory"
    printf "\nand generates screenshot from minute 2'00. ffmpeg is required on the system."
    printf "\nThis behavior can be changed with some valid arguments as described below."
    printf "\n\nUsage: %s [arguments] " "$NAME"
    printf "\n  --format=avi (defaults! but you can specify another format"
    printf "\n                like: mp4, mov, m4v, mkv ...)"
    printf "\n  --twomin (defaults!)"
    printf "\n  --onemin (will generate screenshot from minute 1)"
    printf "\n  --starts (will generate screenshot from second 1)"
    printf "\n  --forced (will force screenshot regeneration)\n"
    printf "\nDefaults : %s " "$NAME"
    printf "\nExample 1: %s --format=mkv" "$NAME"
    printf "\nExample 2: %s --format=avi --starts --forced\n\n" "$NAME"
    exit "${CODE}"
}

checkTools()
{
  local misstools
  for entry in "${@}"
  do
    if ! command -v "${entry}" >/dev/null 2>&1
    then
      misstools="${misstools} ${entry}"
    fi
  done
  [ -z "${misstools}" ] \
    && return \
    || {
         printf "\n[ERROR] Required tools could not be found: \n  %s\n" "${misstools}"
         exit 1
    }
}

# Make sure required tools are installed on system
checkTools ffmpeg

while [[ $# -gt 0 ]] && [[ "$1" == "--"* ]] ;
do
    opt="$1";
    # Expose next argument:
    shift;
    case "$opt" in
        "--" ) break 2;;
        "--format="* )
           INFORMAT="${opt#*=}";;
        "--forced" )
           # Force screenshot regeneration:
           FORCE=1;;
        "--starts" )
           # Timecode change:
           TIMECODE="00:00:01";;
        "--onemin" )
           # Timecode change:
           TIMECODE="00:01:01";;
        "--twomin" )
           # Timecode change:
           TIMECODE="00:02:01";;
        "--help" )
           # Usage:
           displayUsage 0 ;;
        *) printf "\nInvalid option supplied!\n" >&2 ;
           # Usage on invalid argument error:
           displayUsage 1 ;;
   esac
done

while IFS= read -r -d '' file; do
    # Ignore existing video file and poster file couple:
    if [[ ! -f "${file%.$INFORMAT}-poster.jpg" ]]; then
        # Generates a screenshot
        ffmpeg -loglevel quiet -nostdin -ss ${TIMECODE} -i "${file}" -vframes 1 -q:v 2 "${file%.$INFORMAT}-poster.jpg"
    # Override if poster exists but regeneration are required:
    elif [[ -f "${file%.$INFORMAT}-poster.jpg" ]] && [[ ${FORCE} -gt 0 ]]; then
        # Removes existing screenshot
        rm "${file%.$INFORMAT}-poster.jpg"
        # Generates new screenshot after deletion
        ffmpeg -loglevel quiet -nostdin -ss ${TIMECODE} -i "${file}" -vframes 1 -q:v 2 "${file%.$INFORMAT}-poster.jpg"
    fi
done < <( find "${ROOTPATH}" -mindepth 1 -maxdepth 1 -type f -iname "*.${INFORMAT}" -print0 )

exit 0