From Eric...I think it's better to make a clean and lean page altering how that content is displayed to the specific screen size and allow users to select the rest of the content they will need to see by making additional pages that are also clean and lean.
Content first and keep it simple
If your photos or videos aren't needed at mobile sizes, then it would seem they're just being used to take up space on larger screens anyway. But if the visual elements support/enhance the content, then they should be there for any screen size.
We shouldn't be thinking of our mobile layouts as secondary – a fall-back to get by with. They are the main or only access to the web for many users. And for those who do use multiple devices, it could be annoying not to find something while using your phone that you know you saw on your pc.
From an interesting article (with mobile and pc usage info):
Mobile devices these days have CPUs and GPUs almost at par with desktops. And modern WebKit-based mobile browsers are way better than IE8! So you don’t have to dumb it down for mobiles any more. The real limitations are screen space and download bandwidths.
http://www.sitepoint.com/making-case-mo … t-designs/
While I’ve been saying “mobile” first, do note that the principles are not really limited to “mobile” devices. It’s all about better usability, better use of screen real estate and better use of page elements and code – things we should always keep at the forefront, but which often get buried under the bling.
Will the new RLM feature be making use of <picture> and srcset?