iOS 11: HEVC, HEIF, and what you need to know about these new video and photo formats

Up until now, iOS devices have captured video in the MPEG-4/H.264 format, and still photos in JPEG. But with iOS 11 (on recent hardware), Apple is breaking with tradition and switching to a new set of formats that promise dramatic decreases in file size—albeit at the cost of some added complexity in terms of file compatibility.