Rip and encode individual titles and chapters from DVD or ISO

rip-dvd-chapters.sh

#!/bin/bash

set -eo pipefail
shopt -s expand_aliases
alias ffmpeg='ffmpeg -hide_banner'

usage()
{
cat << EOF

usage: extract-dvd-chapters DVD [TITLE] [CHAPTER_START] [CHAPTER_END]

Rips individual chapters in the given DVD title and encodes each to an x264/aac video.

   DVD              e.g. /dev/sr0 or ISO file. NOTE: don't use mounted ISO mountpoint, lsdvd doesn't like it
   TITLE            Title to rip (default 1)
   CHAPTER_START    Chapter to start with, use "-" to merge all chapters in the title to one video (default 1)
   CHAPTER_END      Chapter to end with, inclusive (default: all chapters in the title)

EOF
}

if [ -z "$1" ]; then
  usage
  exit 2
fi


dvd="$1"

if [ -n "$2" ]; then
    title_num="$2"
else
    # TODO loop through titles
    # eval $(lsdvd "$dvd" | sed -n 's/Title: \([0-9]\+\), .* Chapters: \([0-9]\+\), Cells: .*/cells[$((10#\1))]=$((10#\2));/p')
    # titles=${#cells[@]}
    # for now just:
    title_num=1
fi

num_chaps="$(dvdxchap -t $title_num "$dvd"| sed -n 's/^CHAPTER\([0-9]\+\).*/\1/p' | sed -n '$p')"

if [ -n "$3" ]; then
    from_chap="$3"
else
    from_chap=1
fi

if [ -n "$4" ]; then
    to_chap="$4"
else
    to_chap="$num_chaps"
fi

if [ "$3" == "-" ]; then
    merge_chaps=true
    # only want to loop through once
    from_chap=1
    to_chap=1
fi

if [ "$merge_chaps" = true ] ; then
    echo -e "\n\n$dvd: Extracting title $title_num, merging chapters"
else
    echo -e "\n\n$dvd: Extracting title $title_num chapters $from_chap through $to_chap"
fi

for ((c=$from_chap; c<=$to_chap; c++)); do
    # TODO make sure title and chapter are 0-padded for output file name
    if [ "$merge_chaps" = true ] ; then
        chaps="1-$num_chaps"
        output_file="$dvd - $title_num.mp4"
    else
        chaps="$c-$c"
        output_file="$dvd - $title_num.$c.mp4"
    fi

    echo -e "\n\nEncoding title $title_num chapters $chaps...\n"

    # TODO maybe should automate using `-vf cropdetect` with mplayer and passing crop filter to ffmpeg
    # mplayer "dvd://$title_num" -dvd-device "$dvd" -chapter "$chaps" -vf cropdetect

    mkfifo fifo
    mplayer -quiet -msglevel all=2 dvd://"$title_num" -dvd-device "$dvd" -chapter "$chaps" -dumpstream -dumpfile fifo &
    ffmpeg -y -i fifo -c:v libx264 -preset slower -crf 20 -c:a libfdk_aac -vbr 5 -loglevel error "$output_file"
    rm fifo
done

L34-38, just title_num=$(lsdvd /dev/sr0 -q | grep ^Title | wc -l)