The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/ sc 29/ wg 11 held its tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

5.5.4Beyond Main Profile and alternative profile/level nesting relationships

Tiers (US)
JCTVC-J0154 Proposal for definition of levels in HEVC [Mukta Kar, Arianne Hinds, Yasser Syed, Arturo Rodriguez, Wade Wan, Ajay Luthra, Lowell Winger, Clint Sheridan, Paul Haskell]

This suggests a scheme known as "tTiers".

Note that J0151 also suggests tiers.

Decision: Signalling for tiers: Use one bit from the "profile space" bits (0=L, 1=H).

Decision: For single-tier levels, use the current numbers as the low tier, and prohibit the high tier values.

Decision: Modify level specification table for levels 4 and above as follows: