Apple's iPhone photos are currently in the HEIC (high-efficiency image coding) format, an unusual file type that not every app/software support at the moment. If you do not want to use this standard, such as when editing images, you can change the format in Camera settings. Just open "Settings", find "Camera", and then tap "formats". Finally, select "most compatible". This will also allow your videos to come out as H.264 instead of HEVC.
Jason is ripping DVDs and he wants to know how to convert them to use PLEX on the Roku. Leo says to convert using HEVC H.265. While it won't give quality better than the original, it will look as good as it can get. To encode, Leo recommends Handbrake.FR and VLCMedia Client. Regardless of what encoder Jason uses, though, he should make sure to use HEVC H.265
The big story at CES 2015 was in drones, virtual reality headsets, and 4K TVs. The big news with the 4K TVs is that we may finally have a standard for the ultra high definition sets, as a UHD alliance has been formed and UHD Blu-ray players finally had a standard adopted. But they won't be available until the fall. The standard defines the dynamic range and color gamut, as well as the compression algorithm, which is HEVC/H.265.