Video to GIF converter (uses ffmpeg)

gif.sh

#!/bin/bash
printable_colours=256

# DEFAULTS
SIZE=480
FPS=15
LENGTH=2

# Report usage
usage() {
  echo "
ℹ️  Usage:
  $(basename $0) [options] [--] file.ext
Options:
  --size, -s
    Maximum width or height of the output in pixels (Default: 480)
  --fps, -f
    Frames per second (Default: 15)
  --length, -l
    Length of the output in seconds (Default: 2)"

  # Optionally exit with a status code
  if [ -n "$1" ]; then
    exit "$1"
  fi
}

invalid() {
  echo
  echo "❌ Error: Unrecognized argument: $1 🧐" >&2
  usage 1
}

# Pre-process options to:
# - expand -xyz into -x -y -z
# - expand --longopt=arg into --longopt arg
ARGV=()
END_OF_OPT=
while [[ $# -gt 0 ]]; do
  arg="$1"; shift
  case "${END_OF_OPT}${arg}" in
    --) ARGV+=("$arg"); END_OF_OPT=1 ;;
    --*=*)ARGV+=("${arg%%=*}" "${arg#*=}") ;;
    --*) ARGV+=("$arg"); END_OF_OPT=1 ;;
    -*) for i in $(seq 2 ${#arg}); do ARGV+=("-${arg:i-1:1}"); done ;;
    *) ARGV+=("$arg") ;;
  esac
done

# Apply pre-processed options
set -- "${ARGV[@]}"

# Parse options
END_OF_OPT=
POSITIONAL=()
while [[ $# -gt 0 ]]; do
  case "${END_OF_OPT}${1}" in
    -h|--help)      usage 0 ;;
    -s|--size)      shift; SIZE="$1" ;;
    -f|--fps)       shift; FPS="$1" ;;
    -l|--length)    shift; LENGTH="$1" ;;
    # -q|--quiet)     QUIET=1 ;;
    --)             END_OF_OPT=1 ;;
    -*)             invalid "$1" ;;
    *)              POSITIONAL+=("$1") ;;
  esac
  shift
done

# Restore positional parameters
set -- "${POSITIONAL[@]}"

if [ ${#POSITIONAL[@]} != 1 ]; then
  echo
  echo "❌ Error: too many arguments 😩"
  usage 1
fi

FILE=$POSITIONAL

if [ ! -f $FILE ]; then
  echo
  echo "❌ Error: file $FILE does not exist 🤔"
  exit 1
fi

FILE_NAME=`echo $FILE | cut -d'.' -f1`

if [ -f "$FILE_NAME.gif" ]; then
  echo
  echo "❌ Error: file $FILE_NAME.gif already exists 😭"
  exit 1
fi

COLOR_BLUE="\e[34m"
COLOR_CYAN="\e[36m"
COLOR_CYAN_BG="\e[46m\e[30m"
COLOR_RESET="\e[00m"

ORIG_FILE=$(basename $FILE)
DEST_FILE=`echo $ORIG_FILE | cut -d'.' -f1`

MESSAGE="Converting $COLOR_CYAN$ORIG_FILE$COLOR_RESET to $COLOR_BLUE$DEST_FILE.gif$COLOR_RESET"

spinners=("🕛" "🕐" "🕑" "🕒" "🕓" "🕔" "🕕" "🕖" "🕗" "🕘" "🕙" "🕚")
monkeys=("🙈" "🙉" "🙊")

echo

ffmpeg -t $LENGTH -hide_banner -loglevel panic -i $FILE -filter_complex "[0:v] fps=$FPS,scale=$SIZE:$SIZE:force_original_aspect_ratio=decrease,split [a][b];[a] palettegen [p];[b][p] paletteuse" $FILE_NAME.gif & PID=$!

j=0
while kill -0 $PID 2> /dev/null
do
  for i in "${spinners[@]}"
  do
    three_frames=$(( $(($j / 3)) % ${#monkeys[@]} ))
    monkey=${monkeys[$three_frames]}
    printf "\b\r$i$monkey $MESSAGE"
    sleep 0.1
    j=$(($j + 1))
  done
done

printf "\b\r✅ Successfully created $COLOR_BLUE$FILE_NAME.gif$COLOR_RESET"
sleep 1
echo