yt-dl.sh

#!/bin/bash

usage () {
  echo "./$0 <youtube-video-id> <resolution>"
  echo "example: ./$0 cdwal5Kw3Fc 360p"
}

main () {
  url="https://youtube.com/get_video_info?video_id=$1"

  videoInfoFile=$(wget -qO- $url)

  declare -A videoInfo

  while read key value
  do
    videoInfo["$key"]="$value"
  done < <(awk -F'&' '{for(i=1;i<=NF;i++) {print $i}}' <<< $videoInfoFile | awk -F'=' '{print $1" "$2}')

  playerResponse=${videoInfo["player_response"]}
  decodedPlayerResponse=$(printf '%b' "${playerResponse//%/\\x}")

  result=($(echo $decodedPlayerResponse | jq .'streamingData' | jq '.formats' | jq '.[] | .url, .qualityLabel'))

  title=$(echo $decodedPlayerResponse | jq .'videoDetails' | jq .'title' | tr "\"" " " | tr -d '[:space:]' | tr "+" " ")

  declare -A links

  for ((i = 0 ; i < ${#result[@]}-1 ; i+=2))
  do
    url=$(echo ${result[$i]} | tr "\"" " " | tr -d '[:space:]')
    resolution=$(echo ${result[$i+1]} | tr "\"" " " | tr -d '[:space:]')
    links["$resolution"]="$url"
  done

  if [ "${links["$2"]}" = "" ]; then

    if [ ${#links[@]} -eq 0 ]; then
      echo "+ Video not available"
    else
      echo "+ Resolution not available"
      echo "+ Downloadable resolution: ${!links[@]}"
    fi
    exit 1
  fi

  target="$title-$2.webm"
  wget ${links["$2"]} -qO "$target"
}

if [ $# -eq 0 ]; then
  usage
  exit 1
fi

main $1 $2
exit 0


# echo ${links["$2"]}

# echo $result
# result=$()
# echo $result

# jsonFormat=$(echo $videoInfo | tr '&' '\n' | jq -Rsc 'split("\n")')
# jsonLength=$(echo $jsonFormat | jq length)
# echo $jsonFormat | jq '.[csi_page_type]'
# x=$(curl $url)
# echo $x
# cat ../Downloads/get_video_info | tr '&' '\n' | jq -Rsc 'split("\n")' | jq '.[0]'