Download Youtube Best Quality

README.md

Download Youtube Video Best Quality.

• Download video@1080p without audio
• Download audio@256k without video
• Merge video and audio with ffmpeg
• if 1080p video is not exists then select video quality automatically

Install and Usage:

$ brew install youtube-dl
$ brew install ffmpeg

$ ruby dl_youtube.rb YOUTUBE_URL

dl_youtube.rb

require 'shellwords'

url = ARGV[0]

unless url then
  usage = "USAGE: ruby dl_youtube.rb <URL>"
  print "No URL error", "\n"
  print usage, "\n"
  exit 1
end

res = `youtube-dl --get-filename #{url}`
filename = res.strip!
filename_base = Shellwords.shellescape(res.gsub(/\.mp4$/, ''))

if FileTest.exists?(filename) then
  print "Already Downloaded!", "\n"
  exit 1
end
p  "#{filename}"

# Get Best Quality
formats = `youtube-dl -F #{url}`
format_id = 0
format_number = 0
formats.split(/\n/).each do |line| 
  f = line.split(/(^[0-9]+|mp4|[0-9]*p)/).map{ |s| s.strip }.select{|s| !s.empty? } 
  unless f[1] == 'mp4' then next end

  if f[2].match(/[0-9]+p$/) and f[2].to_i > format_number
    format_id = f[0].to_i
    format_number = f[2].to_i
  end
end

print "Video Quality: #{format_number}p", "\n"

res_video_hi = system("youtube-dl -f 137 #{url}")

if res_video_hi then
  res_audio = system("youtube-dl -f 141 #{url}")
  p res_audio
else
  res_video = system("youtube-dl #{url}")
  p res_video
  exit 1
end

unless res_audio
  exit 1
end

res_ffmpeg = system("ffmpeg -i #{filename_base}.mp4 -i #{filename_base}.m4a #{filename_base}.out.mp4")
p res_ffmpeg

if res_ffmpeg then
  File.delete("#{filename_base}.mp4")
  File.delete("#{filename_base}.m4a")
  File.rename("#{filename_base}.out.mp4", "#{filename_base}.mp4")
end