I have a client with an existing Joomla site full of videos.
Every page works well on the site except for one called On Demand Plus. The videos are the same one on a different page, however, for some reason this particular page doesn't load and play the video on some apple products. I don't know too much about Joomla, but I'd like to remedy this situation- do I just recreate the page and disregard or is there something corrupt elsewhere?

Could you post (or PM me) link to that page?

Sure! It's www.reelmagicmagazine.com
the problem is with the on demad plus page of videos (even though some are the same that are on the the on demand page.)

Oh- hopefully you don't need to log in, but if you do to save time you can use the one we have. I'll send if you need it.

The problem is that your video has hardcoded 640x400 size that doesn't fit default mobile screen width of 320px (or 480px in landscape).
I'd recommend you to read this article: alistapart.com/article/creating-intrinsic-ratios-for-video
and then patch jwplayer to add a class attribute to <div id='jwplayer1891341'></div> block (it's an example on your homepage) and change css/custom.css file in your mobile template to use styles from above mentioned article.

Thank you for the help!!!!