H.265 is the latest iteration of compression standards that are based on reducing temporal redundancies in video feeds, or areas of similarity between frames. It has a number of enhancements as compared with its predecessor, H.264, that help it further reduce the bit rate of stream, and although it represents the market direction of video compression formats, there are some drawbacks to adopting this technology now.
Though the technology is complex and advanced, the concept is simple: If a camera is in a fixed position in a room, the background doesn’t often change, but objects walking through the room present changes between frames of video feed. So rather than continuously retransmitting the areas that don’t change, these types of compressions will just transmit the changes, overlaying them on top of the reference image. The act of omitting areas of similarity saves a tremendous amount of bandwidth compared with the compression video format that doesn’t reduce those temporal redundancies.