mp4 downloader

mp4-download.sh

#!/bin/bash
# Download MP4 files. Run the command with --help option to see more details

COMMAND_NAME=./mp4-download.sh
LOGFILE=download.log
FILENAME=""

ARGV_BASE_INDEX=1
ARGV_DEBUG=NO
ARGV__=()

main() {
    parseArgs "$@"

    if [ $ARGV_DEBUG = YES ] ; then
        set -x
    fi

    BASE_INDEX=$ARGV_BASE_INDEX
    M3U8_URLS=`grep -v '^\s*#' ${ARGV__[0]}`

    for M3U8_URL in $M3U8_URLS ; do
        setFileName $BASE_INDEX

        if [ -f $FILENAME ] ; then echo File $FILENAME already exists; exit 1; fi

        downloadFile $M3U8_URL $FILENAME

        BASE_INDEX=$(($BASE_INDEX + 1))
    done
}

setFileName() {
    local INDEX=$1
    local TWO_DIGITS_INDEX=`echo $INDEX | sed 's/^\([[:digit:]]\)$/0\1/'`
    FILENAME=$TWO_DIGITS_INDEX.mp4
}

downloadFile() {
    local M3U8_URL=$1
    local FILENAME=$2
    echo Downloading to $FILENAME...
    ffmpeg -i "$M3U8_URL" -movflags faststart -c copy -bsf:a aac_adtstoasc $FILENAME >> $LOGFILE 2>&1
}

parseArgs() {
    local OPTION_KEY

    while [[ $# -gt 0 ]] ; do
        OPTION_KEY="$1"

        case $OPTION_KEY in
            -h|--help)
            printUsage
            exit 0
            ;;

            -b|--base-index)
            ARGV_BASE_INDEX="$2"
            shift; shift
            ;;

            -d|--debug)
            ARGV_DEBUG=YES
            shift
            ;;

            *)
            ARGV__+=("$1")
            shift
            ;;
        esac
    done
    set -- "${POSITIONAL[@]}" # restore positional parameters
}

printUsage() {
    cat << EOF

  Usage: $COMMAND_NAME [-b base_number] file

  Options:

    -h, --help        output usage information
    -b <base_number>  Number that downloaded file starts with
    file              File that contains list of .m3u8 file URLs
EOF
}

main "$@"