Export DVD chapters into separate movie files using HandBrakeCLI and jq.

export_chapters.sh

#!/bin/bash
SOURCE=$1
DEST_BASE=$2
if [ -z $3 ]; then
    SCAN_RESULT=$(HandBrakeCLI -i $SOURCE --scan -t 0 --json | sed '1,/JSON Title Set/d')
    SCAN_RESULT=$(echo "{" $SCAN_RESULT)
    echo $SCAN_RESULT >$DEST_BASE.json
else
    SCAN_RESULT=$(cat $3)
fi
TO=$4

for i in $(echo $SCAN_RESULT | jq -r '.TitleList[1:][] | "\(.Index):\(.ChapterList | length)"'); do
    INDEX=$(echo $i | cut -d : -f 1)
    echo "($INDEX) Now scanning."
    for c in $(seq 1 $(echo $i | cut -d : -f 2)); do
        if [ -z $TO ] || [ $INDEX -le $TO ]; then
            DEST=${DEST_BASE}-$(printf %02d $INDEX)-$(printf %02d $c).m4v
            if [ ! -f "$DEST" ]; then
                HandBrakeCLI -i $SOURCE -Z "HQ 1080p30 Surround" -t $INDEX -c $c -o ${DEST}
            else
                echo "Skipped ($DEST)."
            fi
        fi
    done
done