Youtube MP3 Downloader Script using AI

#!/bin/bash
# ==========================================================
# YouTube Audio Downloader v3.4 (Debian 12 ready)
# Installs all required dependencies automatically
# ==========================================================

set -e

# ---------- Colors ----------
RED='\033[0;31m'
GREEN='\033[0;32m'
CYAN='\033[0;36m'
YELLOW='\033[1;33m'
NC='\033[0m'

# ---------- Functions ----------

info() { echo -e "${CYAN}[INFO]${NC} $1"; }
warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
err() { echo -e "${RED}[ERROR]${NC} $1"; exit 1; }

# ---------- Root check ----------
if [[ $EUID -ne 0 ]]; then
err "Run this script as root (sudo or root shell)."
fi

# ---------- Dependency installation ----------
info "Preparing system (Debian 12)..."

apt update -y
apt install -y \
curl \
ffmpeg \
ca-certificates

# ---------- yt-dlp binary installation ----------
if ! command -v yt-dlp &>/dev/null; then
info "Installing yt-dlp official binary..."
curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp \
-o /usr/local/bin/yt-dlp
chmod +x /usr/local/bin/yt-dlp
else
info "yt-dlp already installed"
fi

hash -r

info "yt-dlp version: $(yt-dlp --version)"
info "ffmpeg version: $(ffmpeg -version | head -n1)"

# ---------- Defaults ----------
AUDIO_FORMAT="mp3"
AUDIO_QUALITY="0"
DEFAULT_SAVE_PATH="$(pwd)"

echo ""
echo -e "${CYAN}==========================================${NC}"
echo -e "${CYAN} YouTube Audio Downloader (v3.4) ${NC}"
echo -e "${CYAN}==========================================${NC}"
echo ""

# ---------- URL ----------
read -p "Enter YouTube video or playlist URL: " MEDIA_URL
[[ -z "$MEDIA_URL" ]] && err "URL cannot be empty"

# ---------- Playlist detection ----------
if [[ "$MEDIA_URL" == *"list="* ]]; then
IS_PLAYLIST=true
info "Detected playlist URL"
else
IS_PLAYLIST=false
info "Detected single video URL"
fi

# ---------- Playlist options ----------
if [[ "$IS_PLAYLIST" == true ]]; then
read -p "Playlist start index (default 1): " PLAYLIST_START
read -p "Playlist end index (empty = all): " PLAYLIST_END
PLAYLIST_START=${PLAYLIST_START:-1}
fi

# ---------- Save path ----------
read -p "Save path [default: current directory]: " SAVE_PATH
SAVE_PATH=${SAVE_PATH:-$DEFAULT_SAVE_PATH}

mkdir -p "$SAVE_PATH"

# ---------- Cookies ----------
read -p "Use browser cookies for authentication? (y/n): " USE_COOKIES
if [[ "$USE_COOKIES" =~ ^[Yy]$ ]]; then
read -p "Browser (chrome/firefox/edge/brave) [default: chrome]: " BROWSER
BROWSER=${BROWSER:-chrome}
USE_COOKIES=true
else
USE_COOKIES=false
fi

# ---------- Build yt-dlp command ----------
CMD=(yt-dlp
-x
-f "bestaudio/best"
--audio-format "$AUDIO_FORMAT"
--audio-quality "$AUDIO_QUALITY"
--embed-thumbnail
--add-metadata
--extractor-args "youtube:player_client=android"
-i
)

# ---------- SABR compatibility ----------
if yt-dlp --help | grep -q -- '--no-sabr'; then
CMD+=(--no-sabr)
else
warn "--no-sabr not supported by this yt-dlp version (skipping)"
fi

# ---------- Cookies ----------
if [[ "$USE_COOKIES" == true ]]; then
info "Using cookies from browser: $BROWSER"
CMD+=(--cookies-from-browser "$BROWSER")
fi

# ---------- Output template ----------
if [[ "$IS_PLAYLIST" == true ]]; then
CMD+=(--playlist-start "$PLAYLIST_START")
[[ -n "$PLAYLIST_END" ]] && CMD+=(--playlist-end "$PLAYLIST_END")
CMD+=(-o "${SAVE_PATH}/%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s")
else
CMD+=(-o "${SAVE_PATH}/%(title)s.%(ext)s")
fi

CMD+=("$MEDIA_URL")

# ---------- Execute ----------
echo ""
info "Starting download..."
"${CMD[@]}"

# ---------- Result ----------
if [[ $? -eq 0 ]]; then
echo -e "${GREEN}✅ Download completed successfully${NC}"
echo -e "${GREEN}📁 Saved to: ${SAVE_PATH}${NC}"
else
echo -e "${RED}❌ Download failed${NC}"
fi