prototyping generating placeholders for obs scenes

generate.sh

#!/usr/bin/env bash

# nice script boilerplate from https://betterdev.blog/minimal-safe-bash-script-template/
set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] -t text_to_add

Generates a test video signal

Available options:

-h, --help      Print this help and exit
-v, --verbose   Print script debug info
-t, --text      Text to overlay
EOF
  exit
}

cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
  # script cleanup here
}

setup_colors() {
  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
  else
    NOFORMAT='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
  fi
}

msg() {
  echo >&2 -e "${1-}"
}

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

parse_params() {
  # default values of variables set from params
  loglevel="-loglevel quiet"

  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --verbose)
      set -x
      loglevel="-loglevel debug"
      ;;
    --no-color) NO_COLOR=1 ;;
    -t | --text) # named parameter
      text="${2-}"
      shift
      ;;
    -?*) die "Unknown option: $1" ;;
    *) break ;;
    esac
    shift
  done

  args=("$@")

  # check required params and arguments
  [[ -z "${text-}" ]] && die "Missing required parameter: --text"
  # if arguments are required (like the input file)
  # [[ ${#args[@]} -eq 0 ]] && die "Missing script arguments"

  return 0
}

parse_params "$@"
setup_colors

# script logic here

# debugging parameter handling
#msg "${RED}Read parameters:${NOFORMAT}"
#msg "- text: ${text}"
#msg "- arguments: ${args[*]-}"

t1=10
t2=15
x1=0
y1=0
x2=100
y2=100

font="Lato-Regular.ttf"
fontsize="65"
text="'${text}'"
#input="output-text1.mp4"
duration="30"
input="testsrc=duration=${duration}:size=1910x1080:rate=30"
overlay="guest-card-leaves.png"
output="outputVideo.mp4"

ffmpeg ${loglevel:-} -f lavfi -i "${input}" -i "${overlay}" \
    -filter_complex "[0:v][1:v] overlay=0:0, drawtext=${font}:text=${text}:[email protected]:fontsize=${fontsize}:x=150:y=h-th-150" \
    -codec:v libx264 -codec:a copy -y ${output}

needs more parameters hooked up but this may be easier to experiment with the filter expressions