Hi Emily,
Most welcome, of course.
In the particular case I mentioned above, we just use:
<iframe width="560" height="315" id="kaltura_player" src="https://cdnapisec.kaltura.com/p/939341/sp/93934100/embedIframeJs/uiconf_id/22165091/partner_id/939341?iframeembed=true&playerId=kaltura_player&entry_id=0_7m2ujllz&flashvars[streamerType]=auto&&wid=1_9lfq94qd" allowfullscreen="allowfullscreen" webkitallowfullscreen="webkitallowfullscreen" mozallowfullscreen="mozallowfullscreen" frameborder="0"></iframe>Within the post.
I cannot reach https://blogs-dev.deakin.edu.au/test/oembed-testing, perhaps it is only available from your LAN?
One advise I can give you w/o looking, though I could be more productive about it if I could, is to open the browser's dev tools and look at the "Network" and "Console" tabs for errors. Also, and this is quite important, make sure you embed the content over HTTPs as well, i.e, use:
https://cdnapisec.kaltura.com
and not:
http://cdnapi.kaltura.com
A lot if not most browsers, would block the content otherwise, seeing how your blog is over HTTPs.