Shell script to rip VCD with VLC and then transcode with ffmpeg

ripVCD.sh

#!/bin/bash
set -e

## Script to rip VCD with VLC and then transcode with ffmpeg

if [ "${BASH_VERSINFO}" -lt 4 ]; then
    echo "Require bash 4 or higher"
    exit 1
fi

# VCD source to rip. /dev/sr0 is the first SATA drive
SOURCE_DEV="/dev/sr0"
VLC_SOURCE_DRIVE="vcd://$SOURCE_DEV"
# ffmpeg transcoding parameters. H.264 with AAC
FFMPEG_OPTS="-c:v libx264 -crf 20 -c:a aac -b:a 128k -movflags +faststart"

# default output base folder
output_base="."
# default title
timestamp=`date "+%Y%m%d%H%M%S"`
# default title. used as output folder and file name
title="rip_${timestamp}"
# default starting disc count
start=1

while getopts t:n:d: flag; do
    case "${flag}" in
        t) title=${OPTARG};;
        n) start=${OPTARG};;
        d) output_base=${OPTARG};;
        \? ) echo "Uage: $0 [-t title] [-n starting_num] [-d destination_base_folder]" & exit;;
    esac
done

trap breakTrap SIGINT
breakTrap() {
    echo "Interrupted. Exiting..."
    exit
}

destination=${output_base}/$title
mkdir -p "$destination"
declare -a pids=()

echo "Ripping \"$VLC_SOURCE_DRIVE\" into \"$destination\""

for i in $(seq -w $start 999); do
    while read -r -t 0; do read -r; done
    echo
    echo "**********************************"
    echo "Press any key to rip next disc $i to \"${destination}\". Press 'q' to quit"
    echo
    read -n 1 key <&1
    if [[ $key = q ]]; then
        break
    fi
    if [ -f "${destination}/${title} ${i}.dat" ]; then
        while read -r -t 0; do read -r; done
        echo "${destination}/${title} ${i}.dat exists. Press 'q' to quit"
        read -n 1 key <&1
        if [[ $key = q ]]; then
            break
        fi
    fi
    # the built-in transcoding of vlc creates choppy video if the VCD disc is in poor condition.
    # so first dump the streams and then transcode with ffmpeg in background
    vlc -I "dummy" --play-and-exit "$VLC_SOURCE_DRIVE" --demux=dump --demuxdump-file="${destination}/${title} ${i}.dat"
    eject -T "$SOURCE_DEV"
    echo "Starting background job to transcode video..."
    ffmpeg -hide_banner -loglevel error -y -i "${destination}/${title} ${i}.dat" $FFMPEG_OPTS "${destination}/${title} ${i}.mp4" > /dev/null 2>&1 && rm -f "${destination}/${title} ${i}.dat" &
    pids+=($!)
done

if [ ${#pids[@]} -ne 0 ]; then
    echo "Finishing up. Waiting for background transcoding jobs to complete..."
    for pid in "${pids[@]}"; do
        wait $pid
    done
fi

ls -lA "${destination}"