6.10.6.1.1.1.1.1.1JCTVC-F463 On NAL unit header [Y.-K. Wang (Huawei)]
This document presented the following proposals:
1) Dropping forbidden_zero_bit from the NAL unit header;
Remark: It was also envisioned as an error flag that could be set when a problem was detected to flag error conditions for the decoder.
Remark: Define a special "bad NAL unit type" to indicate errors?
Remark: Making it reserved would let us use it later if desirable.
Remark: That had something to do with distinguishing from MPEG-2 Systems start codes.
The group agreed to keep it zero because of MPEG-2 Systems.
2) Changing nal_ref_idc (2 bits) in the NAL unit header to nal_ref_flag (1 bit);
Decision: Adopt (and absorb it into the nal_unit_type).
3) Unification of the NAL unit header to be a fixed-length 2-byte header;
Further study of this was encouraged.
4) A sub-bitstream extraction process utilizing the unified NAL unit header.
Further study of this was encouraged.
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