why this error

root@demo:/var/www# ruby post.rb
post.rb:7: syntax error, unexpected tIDENTIFIER, expecting '}'
..." [video][track kind="captions" src="http://video-js.zencode...
                              ^
post.rb:7: syntax error, unexpected tIDENTIFIER, expecting $end
...rack kind="captions" src="http://video-js.zencoder.com/ocean...
                              ^





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# encoding: UTF-8

require 'xmlrpc/client'

# build a post

post = {
  'title'       =>  "Post Title 7",
  'description' => " [video][track kind=\"captions\" src=\"http://video-js.zencoder.com/oceans-captions.vtt\" srclang=\"en\" label=\"English\" default=\"true\"][/video]",
  'mt_keywords' => ['a', 'list', 'of', 'tags'],
  'categories'  => ['a', 'list', 'of', 'categories']
}

# initialize the connection

connection = XMLRPC::Client.new('5.175.158.210', '/xmlrpc.php')

# make the call to publish a new post

connection.call(
  'metaWeblog.newPost',
  1,
  'root',
  'passme2150',
  post,
  true
)