[5][6][7] Macroblock encoding methods have been used in digital video coding standards since H.261 which was first released in 1988.
[3][12] This was added to HEVC in the Draft International Standard as a level limit for the Log2MaxCtbSize variable.
[2] This has been shown in peak signal-to-noise ratio (PSNR) tests with a HM-8.0 HEVC encoder where it was forced to use progressively smaller CTU sizes.
[2] The tests showed that large CTU sizes become even more important for coding efficiency with higher resolution video.
[2] The tests showed that large CTU sizes increase coding efficiency while also reducing decoding time.