Script to download youtube video using command line

run-download-video.sh

#!/bin/bash

# Function to check if a command exists
command_exists() {
  command -v "$1" >/dev/null 2>&1
}

# Check for yt-dlp
if ! command_exists yt-dlp; then
  echo "yt-dlp not found. Installing yt-dlp..."
  curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o ~/.local/bin/yt-dlp
  chmod a+rx ~/.local/bin/yt-dlp
  export PATH=$PATH:~/.local/bin
fi

# Check for ffmpeg
if ! command_exists ffmpeg; then
  echo "ffmpeg not found. Installing ffmpeg..."
  brew install ffmpeg --quiet
fi

# Check for python3
if ! command_exists python3; then
  echo "python3 not found. Please install python3."
  exit 1
fi

# Check for virtual environment and activate it
if [ ! -d "venv" ]; then
  echo "Creating virtual environment..."
  python3 -m venv venv
fi

source venv/bin/activate

# Check for required Python packages
pip install --quiet browser-cookie3 boto3 requests

# Check if the correct number of arguments is provided
if [ "$#" -ne 1 ]; then
  echo "Usage: $0 <youtube_url>"
  exit 1
fi

YOUTUBE_URL=$1

# Python script to extract YouTube cookies
extract_youtube_cookies_py=$(cat <<'EOF'
import browser_cookie3
import os

LOCAL_COOKIES_PATH = "/tmp/cookies.txt"

def extract_youtube_cookies():
    try:
        cookies = browser_cookie3.chrome(domain_name='youtube.com')
        with open(LOCAL_COOKIES_PATH, 'w') as file:
            file.write("# Netscape HTTP Cookie File\n")
            file.write("# This file was generated by extract_youtube_cookies.py\n")
            file.write("#\n")
            for cookie in cookies:
                file.write(
                    f"{cookie.domain}\t"
                    f"{'TRUE' if cookie.domain.startswith('.') else 'FALSE'}\t"
                    f"{cookie.path}\t"
                    f"{'TRUE' if cookie.secure else 'FALSE'}\t"
                    f"{int(cookie.expires) if cookie.expires else 0}\t"
                    f"{cookie.name}\t"
                    f"{cookie.value}\n"
                )
        print(f"Cookies saved to {LOCAL_COOKIES_PATH}")
    except Exception as e:
        print(f"Failed to extract cookies: {e}")
        print("Consider using Firefox, or manually exporting cookies using a browser extension like EditThisCookie.")

extract_youtube_cookies()
EOF
)

# Generate cookies file
echo "Generating cookies file..."
python3 -c "$extract_youtube_cookies_py"
COOKIES_FILE="/tmp/cookies.txt"

# Fetch video information in JSON format
VIDEO_INFO=$(yt-dlp -J "$YOUTUBE_URL")

# Extract the video title
VIDEO_NAME=$(echo "$VIDEO_INFO" | jq -r '.title')

echo "Downloading video: $VIDEO_NAME"

# Sanitize the video name to remove any illegal characters
sanitize_filename() {
  echo "$1" | sed 's/[\\/*?:"<>|]/_/g'
}

VIDEO_NAME=$(sanitize_filename "$VIDEO_NAME")

# Set the extension to mp4
EXT="mp4"

# Download the video using the sanitized video name and correct extension
yt-dlp --paths downloads -f bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4] -o "${VIDEO_NAME}.${EXT}" "${YOUTUBE_URL}" --cookies "$COOKIES_FILE"

# Clean up the cookies file
rm "$COOKIES_FILE"