#!/bin/bash

MPLAYER="mplayer"

if ! [ -b /dev/dvd ]; then
    echo "Usage: $0 [dvd-device] [folder]"
    exit 1
fi

dvddevice="${1:-/dev/dvd}"
folder="${2:-$(date +%Y-%m-%d_%H-%M)}"
mkdir -p "$folder"
cd "$folder"

"$MPLAYER" 2> /dev/null \
    -quiet -ao null -vo null -frames 0 -identify -dvd-device "$dvddevice" dvd:// | \
    grep 'ID_DVD_TITLE_[0-9]*_LENGTH' | cut -d'_' -f4 | while read i
do
    "$MPLAYER" -dumpstream -dumpfile "movie_${i}.mpg" -dvd-device "$dvddevice" dvd://"$i"
done