Script to remove unwanted audio/subtitles tracks from MKV

handle_mkv_files.sh

#!/bin/bash
##
# @Description: Script to remove unwanted audio/subtitles tracks from MKV
##

AUDIO_LANGUAGE="und,eng"
SUBTITLE_LANGUAGE="pt,por,pt-PT"
SUBTITLE_ID="false"
LANGUAGE_ID="false"
DELETE_SOURCE="false"

show_usage() {
    printf "Usage: $0 [options [parameters]]%s\n"
    printf "\n"
    printf "Options:\n"
    printf " -p|--path, Provide the path.\n"
    printf " -a|--audio, audio languages, comma separated (und,eng).\n"
    printf " -s|--subtitle, subtitle languages, comma separated (pt,por,pt-PT).\n"
    printf " -sid|--subtitleid, set specific subtitle languages as default and Forced.\n"
    printf " -d|--delete, delete source files.\n"
    printf " -i|--info, check video file properties.\n"
    printf "            USAGE: -p \"full path to video\" -i.\n"
    printf "               OR: -p full\ path\ to\ video -i.\n"
    printf " -h|--help, Print help.\n"

    exit 0
}

while [ -n "$1" ]; do
    case "$1" in
    --path | -p)
        shift
        FILES="$1"
        ;;
    --audio | -a)
        shift
        AUDIO_LANGUAGE="$1"
        ;;
    --subtitle | -s)
        shift
        SUBTITLE_LANGUAGE="$1"
        ;;
    --subtitleid | -sid)
        shift
        SUBTITLE_ID="$1"
        ;;
    --languageid | -lid)
        shift
        LANGUAGE_ID="$1"
        ;;
    --delete | -d)
        shift
        DELETE_SOURCE="true"
        ;;
    --info | -i)
        shift
        [ ! -f "$FILES" ] && show_usage
        mkvinfo "${FILES}" >dump && grep -E '(Language|Name|track ID|Codec ID)' dump
        [ -f dump ] && rm dump
        exit 0
        ;;
    *)
        show_usage
        ;;
    esac
    if [ $# -gt 0 ]; then
        shift
    fi
done

handle_mkv_individual_files() {
    local fullpath="$1"
    local output="$2"
    local audio_lang="$3"
    local audio_lang_id="$4"
    local sub_lang="$5"
    local sub_lang_id="$6"
    local delete="$7"
    local path
    path="$(dirname "${fullpath}")"
    local file
    file="$(basename "${fullpath}")"
    echo "file $file"

    echo "#############################################################################################################"
    echo "###  Processing $file..."
    echo "#############################################################################################################"

    if [ "${sub_lang_id}" = "false" ] && [ "${audio_lang_id}" = "false" ]; then
        /usr/bin/mkvmerge -o "${output}/$file" -a "$audio_lang" -s "$sub_lang" "$path/$file"
    elif [ "${sub_lang_id}" != "false" ] && [ "${audio_lang_id}" = "false" ]; then
        /usr/bin/mkvmerge -o "${output}/$file" \
            -a "$audio_lang" -s "$sub_lang" \
            --default-track-flag "$sub_lang_id":yes \
            --forced-display-flag "$sub_lang_id":yes \
            "$path/$file"
    elif [ "${sub_lang_id}" = "false" ] && [ "${audio_lang_id}" != "false" ]; then
        /usr/bin/mkvmerge -o "${output}/$file" \
            -a "$audio_lang" \
            --default-track-flag "$audio_lang_id":yes \
            --forced-display-flag "$audio_lang_id":yes \
            -s "$sub_lang" \
            "$path/$file"
    else
        /usr/bin/mkvmerge -o "${output}/$file" \
            -a "$audio_lang" \
            --default-track-flag "$audio_lang_id":yes \
            --forced-display-flag "$audio_lang_id":yes \
            -s "$sub_lang" \
            --default-track-flag "$sub_lang_id":yes \
            --forced-display-flag "$sub_lang_id":yes \
            "$path/$file"
    fi

    echo "###  ${output}/$file created..."
}

handle_mkv_files() {
    local path="$1"
    local output="$2"
    local audio_lang="$3"
    local audio_lang_id="$4"
    local sub_lang="$5"
    local sub_lang_id="$6"
    local delete="$7"

    if [ -f "$path" ]; then
        handle_mkv_individual_files "$path" "$output" "$audio_lang" "$audio_lang_id" "$sub_lang" "$sub_lang_id" "$delete"
    else
        cd "$path" || exit
        for file in *.mkv; do
            handle_mkv_individual_files "$path/$file" "$output" "$audio_lang" "$audio_lang_id" "$sub_lang" "$sub_lang_id" "$delete"
        done
        
        if [ "${delete}" = "true" ]; then
            find "${output}" -name '*.mkv' -exec mv -t "${path}/" {} +
            [ -d "$output" ] && rm -rf "$output"
        fi
        exit 0
    fi
}

[ -z "$FILES" ] && show_usage
[ ! -d "$FILES" ] && [ ! -f "$FILES" ] && show_usage
FOLDER="${FILES}"
[ -f "$FILES" ] && FOLDER="$(dirname "$FILES")"
OUTPUT_FOLDER="${FOLDER}/fixed"
[ ! -d "$OUTPUT_FOLDER" ] && mkdir -p "$OUTPUT_FOLDER"

handle_mkv_files "$FILES" "$OUTPUT_FOLDER" "$AUDIO_LANGUAGE" "$LANGUAGE_ID" "$SUBTITLE_LANGUAGE" "$SUBTITLE_ID" "$DELETE_SOURCE"