#!/usr/bin/env bash

set -euo pipefail

# Defaults
q=32
cpu=4
time_limit=""
print_only=false

while getopts :q:c:t:s OPT; do
    case $OPT in
        q|+q)
            q="$OPTARG"
            ;;
        c|+c)
            cpu="$OPTARG"
            ;;
        t|+t)
            time_limit="-to $OPTARG"
            ;;
        s)
            print_only=true
            ;;
        *)
            echo "usage: `basename $0` [+-q ARG] [+-c ARG} [--] ARGS..."
            exit 2
    esac
done
shift `expr $OPTIND - 1`
OPTIND=1

command="$(cat<<EOF
ffmpeg -y -i "$1" $time_limit -c:v libvpx-vp9 -b:v 0 -crf $q -an -row-mt 1 -tile-columns 2 -tile-rows 2 -cpu-used $cpu -g 240 -pass 1 -f webm -threads $cpu /dev/null &&
    ffmpeg -y -i "$1" $time_limit -c:v libvpx-vp9 -b:v 0 -crf $q -c:a libopus -row-mt 1 -tile-columns 2 -tile-rows 2 -cpu-used $cpu -pass 2 -g 240 -threads $cpu "$2"
EOF
)"

if [ $print_only == true ]; then
    echo "$command"
else
    eval "$command"
fi