According to Hunt, one of the changes Netflix ended up making to its systems, to enable 4K streaming, was to switch from the h.264 encoding to High Efficiency Video Coding (HEVC) h.265 encoding which he says is a little bit more efficient, therefore not taking up as much bandwidth to stream.
Neil Hunt also said that Netflix improved its adaptive streaming technology to give subscribers a seamless transition to 4K content. Using adaptive streaming, watchers may start viewing content via a high-definition 720p stream and then to a 1080p stream as the system loads the 4K content.
Hunt also acknowledged that to see 4K content, subscribers also needed to have television sets with built-in HEVC h.265 decoders. However, he said that all 4K television sets launched last year have h.265 decoders.