Add an eventlistener for error to the video node.check the w3c spec on html5 video to make sense of what that event tells you (I'm on my iPad right now, else I'd give you more details....)
Also check the console for error messages and if your htaccess add type actually worked. Might be your provider disabled that. Which browsers did you test it in? Ie9 is very picky, chrome takes it all and firefox is kinda in between, like safari)
Last but not least, using ogv and webm is overkill. Decide for one of them. You only NEED mp4 and ONE of e others. Go to www.caniuse.com and search for "video" to understand why
