feat: add first demuxer function

Still WIP, not working

kioskgen.sh

@@ -0,0 +1,100 @@
+#!/bin/env bash
+
+set -e
+
+LONG_ARGUMENTS=(
+    "output:"
+    "debug"
+    "help"
+)
+SHORT_ARGUMENTS=(
+    "o:"
+    "d"
+    "h"
+)
+OPTS=$(getopt \
+           --longoptions "$(printf "%s," "${LONG_ARGUMENTS[@]}")" \
+           --options "$(printf "%s," "${SHORT_ARGUMENTS[@]}")" \
+           --name "$(basename "${0}")" \
+           -- "${@}"
+    )
+
+eval set -- "${OPTS}"
+
+### Utility functions ###
+print_help() {
+    echo "$(basename "${0}") [FLAGS...] FOLDER
+
+<description>
+
+Parameters:
+-d    --debug        Enable debug output
+-h    --help         This very help
+"
+}
+
+err() {
+    echo "${@}" >&2
+}
+
+create_demuxer_file() {
+    local demuxer_file="$(mktemp)"
+    local entry_template=<<EOF
+file '${FILE_PATH}'
+duration ${DURATION_SECOND}
+EOF
+    local last_entry_template=<<EOF
+file '${FILE_PATH}'
+duration ${DURATION_SECOND}
+file '${FILE_PATH}'
+EOF
+    local last_img=""
+    for img_to_demux in "${INPUT_FOLDER}"/*.jpeg "${INPUT_FOLDER}"/*.jpg "${INPUT_FOLDER}"/*.png
+    do
+        last_img="${img_to_demux}"
+        local random_duration=$((${RANDOM}%${MAX_PHOTO_DURATION_SECONDS}))
+        echo <<EOF >> "${demuxer_file}"
+file '${img_to_demux}'
+duration ${random_duration}
+EOF
+    done
+
+    echo "file '${last_img}'" >> "${demuxer_file}"
+}
+########################
+
+
+### Config ###
+VIDEO_TITLE="output"
+MAX_PHOTO_DURATION_SECONDS=10
+##############
+
+
+while [[ $# -gt 0 ]]; do
+    case "${1}" in
+        --debug)
+            set -x
+            shift 1
+            ;;
+        -d)
+            set -x
+            shift 1
+            ;;
+        --help)
+            print_help
+            exit 0
+            ;;
+        -h)
+            print_help
+            exit 0
+            ;;
+        --)
+            shift 1
+            break
+            ;;
+    esac
+done
+
+INPUT_FOLDER="${1}"
+shift 1
+