require 'xmlrpc/client'

# build a post

post = {
  'title'       => 'Post Title 2',
  'description' => 'http://www.demo/video.mp4',
  'mt_keywords' => ['a', 'list', 'of', 'tags'],
  'categories'  => ['a', 'list', 'of', 'categories']
}

# initialize the connection

connection = XMLRPC::Client.new('129.0.0.01', '/xmlrpc.php')

# make the call to publish a new post

connection.call(
  'metaWeblog.newPost',
  1,
  'username',
  'pass',
  post,
  true
)