Problems with Rails 3 Webrick and loading video for iPhone/iPad ( mp4 m4v ) video files - iphone

Question

I'm trying to get Rails (3.0.0) to serve a simple m4v video file for iphone in a html5 video block. For sanity's sake i'm using the big buck bunny video from http://camendesign.com/code/video_for_everybody that I know is properly encoded for iphone and works
When i run this on an apache server it runs perfectly. But on my rails dev environment it just loads a black box with a slash through it. My instinct tells me it has to be some type of mime issue.
I've tried adding these lines to my mime_types.rb file:
Mime::Type.register "video/mp4", :mp4
Mime::Type.register "video/mp4", :m4v
Rack::Mime::MIME_TYPES.merge!({
".ogg" => "application/ogg",
".ogx" => "application/ogg",
".ogv" => "video/ogg",
".oga" => "audio/ogg",
".mp4" => "video/mp4",
".m4v" => "video/mp4",
".mp3" => "audio/mpeg",
".m4a" => "audio/mpeg"
})
But no luck. Some have suggested to add this line to the mime_types file too
MIME::Type.add(MIME::Type.from_array("video/mp4", %(m4v))
But that results in this error:
NameError: uninitialized constant MIME
from (irb):4
from /Users/theshaolinmonk/.rvm/gems/ruby-1.9.2-p0#rails3/gems/railties-3.0.0/lib/rails/commands/console.rb:44:in `start'
from /Users/theshaolinmonk/.rvm/gems/ruby-1.9.2-p0#rails3/gems/railties-3.0.0/lib/rails/commands/console.rb:8:in `start'
from /Users/theshaolinmonk/.rvm/gems/ruby-1.9.2-p0#rails3/gems/railties-3.0.0/lib/rails/commands.rb:23:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
Anyone have any idea ?

Answer 1

Maybe add the following line to your Gemfile?
gem 'mime-types', :require => 'mime/types'