playlist2mp3.sh - Small, useful shell wrapper for `youtube-dl`

playlist2mp3.sh

#!/usr/bin/env sh

YTDL_UNIVERSAL_PATH="Python27/Scripts/youtube-dl"

help() {
    echo ""
    echo "playlist2mp3 - A small, useful youtube-dl wrapper."
    echo ""
    echo "Download a YouTube playlist and for each video,"
    echo "extract its audio stream & save it to an mp3 file."
    echo ""
    echo "    Usage: playlist2mp3.sh [OPTIONS] YTPLAYLIST_ID"
    exit 1
}

no_args() {
    echo ""
    echo -e "[ERROR] Invalid argument count. Requires a playlist id, at least."
    help
}

no_platform() {
    echo -e "[ERROR] Failed detecting shell envorinment. Aborting.."
    exit 1
}

no_prefix() {
    echo -e "[ERROR] Failed setting a path prefix. Aborting.."
    exit 1
}

detect_platform() {
    case "$1" in
      C:*) echo "win";; # is it a windows cmd?
      /cygdrive*) echo "cyg";; # or maybe a cygwin mintty?
      /c/*) echo "git";; # or is it a common bash shell?
      *) no_platform;;
    esac
}

set_path_prefix() {
    case "$1" in
      win) echo "C:";;
      cyg) echo "/cygdrive/c";;
      git) echo "/c";;
      *) no_prefix;;
    esac
}

# Check arguments
if [ $# == 0 ]; then
	no_args
fi;

echo ""
echo "Checking system.."

# Detect platform context
PLTFRM=`detect_platform "${0}"`
echo -e "  Shell context: $PLTFRM"

# Set platform-specific path vars
PATH_PREFIX=`set_path_prefix $PLTFRM`
YTDL_BIN="$PATH_PREFIX/$YTDL_UNIVERSAL_PATH"
echo -e "  Binary path:   $YTDL_BIN"

YT_URL="https://www.youtube.com/playlist?list=$1"
echo "Okay. All set."
echo -e "  Starting (bulk) download & conversion now.."
echo ""

# Start (bulk) download and conversion
$YTDL_BIN --format mp4 --merge-output-format mp4 \
 --extract-audio --audio-format mp3 --audio-quality 0 \
 --yes-playlist -o "%(autonumber)s-%(title)s.%(ext)s" \
 --add-metadata --restrict-filenames --no-overwrites \
 --prefer-ffmpeg --hls-prefer-ffmpeg \
 --ignore-errors --geo-bypass \
 $YT_URL