extract-audio

#!/bin/bash

# Description: This script extracts audio from video using ffmpeg.
# Dependency: ffmpeg

# Prints an error message to stderr
print_error() {
  echo "Error: $1" >&2
  exit 1
}

# Prints an help message 
print_help() {
	echo "extract-audio, It extracts audio from video using ffmpeg"
  echo "  Usage:"
  echo "      extract-audio [input-filename] [output-filename]"
}

# Check if ffmpeg is installed
if ! command -v ffmpeg >/dev/null 2>&1; then
  echo "Error: 'ffmpeg' is not installed. Please install it using your package manager."
  exit 1
fi

case "${1:-}" in
  # Exit with code 0 only if help was explicitly requested
  -h|--help)
    print_help
    exit 0
    ;;
  '')
    print_help
    exit 1
    ;;
esac

# checks the file exist and extract audio
if [[ -f "$1" ]]; then
  if [[ "$2" != "" ]]; then
    ffmpeg -i "$1" "$2"
  else
    print_error "\"$2\": no output file-name given."
  fi
else
  print_error "\"$1\": no such file."
fi