#!/usr/bin/env bash

video_file_path="$1"
from="$2"
to="$3"


set -error

tmpdir_path="${TMPDIR:-/tmp}/"

video_file_name="$(basename "$video_file_path")"
dest_name="${video_file_name%.*}".gif

frame_file_name_prefix="$(mktemp -u "vidtogif_XXXXXXXXXX_${video_file_name}_frame")"

ffmpeg_input_opts=""
if [[ $from ]]; then
  ffmpeg_input_opts="$ffmpeg_input_opts -ss $from"
fi
if [[ $to ]]; then
  ffmpeg_input_opts="$ffmpeg_input_opts -to $to"
fi

ffmpeg $ffmpeg_input_opts -i "$video_file_path" "$tmpdir_path""$frame_file_name_prefix"_%04d.png
gifski -o "$dest_name" "$tmpdir_path""$frame_file_name_prefix"*

rm "$tmpdir_path""$frame_file_name_prefix"*