<i>Firstly, there is no such thing as &quot;retina quality video&quot;. If you mean 4K, then say 4K. &quot;Retina&quot; is Apple marketing spin for their high density displays that you seem to be using to describe a standard of video.</i><p>I don&#x27;t mean 4K. I mean transcoding video assets to specific resolutions that match the website&#x27;s responsive breakpoints, with 2X resolution versions for high pixel density displays (eg retina). Pushing a 4K video down to someone whose browser viewport is 800px wide is the sort of wastefulness people complain about.