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Those of you that know me, know I’m a big fan of WordPress. All of my personal sites run on WordPress, both the Greece Historical Society and Friends of the Aurora Public Library sites which I manage run on WordPress, and Nebraska Libraries on the Web which I’m in charge of runs on WordPress. Ok, I live and breathe WordPress. So, if you do too, you probably know that you can easily embed external content from sites like YouTube and Flickr just by pasting the item’s URL on its own line. But did you know that you can also do this with sites like Instagram, Twitter, SlideShare and TED? No? Well now you do. And, if you’re interested in a complete list you can find it on the Embeds page in the WordPress Codex.
Another reason to host video or audio remotely is to give access to multiple formats of the file. EPUB3 has the capability of looking through a series of links and only using the one that works best in a given ereader. Including multiple versions of a video file in an EPUB file would result in unnecessary bloat. (Of course, this is a bit of a moot point in a world in which video and audio in EPUB mostly works in iBooks, but that is changing with Readium, and surely with newer ereaders. The fact that there is no agreed upon codec for video is also an important factor.)
Read the full article (including code examples) @ Pigs, Gourds, and Wikis.