Temporal sub-layer descriptor

A method for decoding a video bitstream comprising the steps of:

• (a) receiving said video bitstream that includes a plurality of different layers, where one of said plurality of different layers includes a plurality of temporal sub-layers;
• (b) receiving a value of a value attribute associated with one of the plurality of temporal sub-layers where said value includes a first part and a second part separated by a delimiter;
• (c) decoding said bitstream based upon said value attribute,
• (d) wherein said first part is an 8-bit unsigned integer with a value equal to a level for temporal sub-layer zero of said plurality of temporal sub-layers,
• (e) wherein said second part is, alternatively,
• (i) if said second part is present then said second part is a coded string of a single layer video encoding with a syntax element based upon a sub layer profile space, a sub layer tier flag, a sub layer profile idc, 32 bits of sub layer profile compatibility flags, and each of 6 bytes of constraint flags starting from a sub layer progressive source flag respectively substituted for an element general profile space, a general tier flag, a general profile idc, a general profile compatibility flag in the range of 0 to 31, inclusive, and each of 6 bytes of constraint flags starting from a general progressive source flag,
• (ii) if said second part is absent then all other profile tier level parameters for said temporal sub-layer zero, besides a sub layer level idc[0] parameter which is signalled in said first part, are inferred to be same as the value of those parameters signalled codecs parameter for the representation,
• (f) wherein if all representations of an adaptation element contain temporal sub-layering with the same profile tier, level, and flag information for said temporal sub-layer zero then at least one of said first part and said second part may be used for said adaptation element.