A wrapper script for `transcode-video` with an experimental simple constrained ratecontrol system.

experimental-simple-transcode-video.sh

#!/bin/bash
#
# experimental-simple-transcode-video.sh
#
# Copyright (c) 2013-2018 Don Melton
#

die() {
    echo "$(basename "$0"): $1" >&2
    exit ${2:-1}
}

args=()
blu_ray=''
dvd=''
blu_ray_target='6000'
dvd_target='1500'
target=''
hrd_args='--encoder-option nal-hrd=vbr'

while [ "$1" ]; do
    case $1 in
        --blu-ray|--bluray)
            blu_ray='yes'
            dvd=''
            target=''
            ;;
        --dvd)
            blu_ray=''
            dvd='yes'
            target=''
            ;;
        --target)
            case $2 in
                big)
                    blu_ray_target='8000'
                    dvd_target='2000'
                    target=''
                    ;;
                small)
                    blu_ray_target='4000'
                    dvd_target='1000'
                    target=''
                    ;;
                [0-9][0-9]*)
                    target="$2"
                    ;;
                *)
                    die "unsupported argument: $2"
                    ;;
            esac
            shift
            ;;
        --abr)
            die "unsupported argument: $1"
            ;;
        -H|--handbrake-option)
            args=("${args[@]}" "$1")

            if [[ "$2" =~ ^encoder=x265 ]]; then
                hrd_args='--encoder-option hrd=1'
            fi
            ;;
        *)
            args=("${args[@]}" "$1")
            ;;
    esac
    shift
done

if [ ! "$target" ]; then

    if [ "$blu_ray" ]; then
        target="$blu_ray_target"

    elif [ "$dvd" ]; then
        target="$dvd_target"
    else
        die 'missing argument: must include `--blu-ray` or `--dvd`'
    fi
fi

transcode-video \
    --target $target \
    --encoder-option vbv-bufsize="$target" \
    --encoder-option _crf-max \
    --encoder-option _qpmax \
    $hrd_args \
    "${args[@]}"

exit $?