[Rails] Use .ogv videos with Rails

Hello, I'm trying to read .ogv files in my rails application and have
a problem with ff, it won't load the video but will show a big X
instead. After googling for a while I found out the mime types can be
a problem with FF and add the following lines into my /config/
initializers/mime_types.rb file according to what I red in this site
http://9elements.com/io/?p=306:

Rack::Mime::MIME_TYPES.merge!({
".ogv" => "video/ogg",
".webm" => "video/webm",
".mp4" => "video/mp4"
})

But still no changes. I'm using rails 2.3.5 in development mode.

Any idea?

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