Embedding ogg/ogv files

[jana]

I'd like to embed an ogv file in my journal, but it doesn't work for, to me, inexplicable reasons. Whenever I try to include the code below, DW changes it to <site-embed id="22"></site-embed> after saving. Does anyone know why that is, or what I'm doing wrong? The code example is copied from Wikimedia using the 'Use this file on the web' link.

<iframe src="http://commons.wikimedia.org/wiki/File:Flock_of_birds_at_Rome.ogg?withJS=MediaWiki:MwEmbed.js&embedplayer=yes" width="120" height="90" frameborder="0" ></iframe>

Youtube embeds work just fine.