You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: video_tag.rb
    path of file: ./repos/octopress/plugins
    
    the code of the file until where you have to start completion: # Title: Simple Video tag for Jekyll
# Author: Brandon Mathis http://brandonmathis.com
# Description: Easily output MPEG4 HTML5 video with a flash backup.
#
# Syntax {% video url/to/video [width height] [url/to/poster] %}
#
# Example:
# {% video http://site.com/
    
    def render(context)
      output = super
      types = {
        '.mp4' => "type='video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"'",
        '.ogv' => "type='video/ogg; codecs=theora, vorbis'",
        '.webm' => "type='video/webm; codecs=vp8, vorbis'"
      }
      if @videos.size > 0
        video =  "<video #{sizes} preload='metadata' controls #{poster}>"
        @videos.each do |v|
          video << "<source src='#{v}' #{types[File.extname(v)]}>"
        end
        video += "</video>"
      else
        "Error processing input, expected syntax: {% video url/to/video [url/to/video] [url/to/video] [width height] [url/to/poster] %}"
      end