Opened 11 years ago

Closed 6 years ago

#1110 closed defect (fixed)

Clarification needed in SPS ordering information semantics

Reported by: jackh Owned by:
Priority: minor Milestone:
Component: Text Version: D10 (L1003) v33
Keywords: Cc: bbross, wjhan, jct-vc@…


The definitions of sps_max_dec_pic_buffering_minus1, sps_max_num_reorder_pics and sps_max_latency_increase_plus1, which define ranges based on the corresponding parameters in the VPS, don't state what should be done in the case where vps_max_sub_layers_minus1!=sps_max_sub_layers_minus1. This is particularly a problem if vps_max_sub_layers_minus1<sps_max_sub_layers_minus1, as some elements of these parameters won't have corresponding elements in the VPS. Unless I've missed something in the spec?

Change History (4)

comment:1 Changed 11 years ago by DefaultCC Plugin

  • Cc bbross wjhan jct-vc@… added

comment:2 Changed 11 years ago by yk

The semantics of vps_max_sub_layers_minus1 and sps_max_sub_layers_minus1 imply that vps_max_sub_layers_minus1 is always equal to or greater than sps_max_sub_layers_minus1. However, I agree that it would have been clearer if we add in the semantics of sps_max_sub_layers_minus1 that "The value of sps_max_sub_layers_minus1 shall be less than or equal to vps_max_sub_layers_minus1". Would explicitly saying the implicit restriction sufficiently address this issue?

comment:3 Changed 11 years ago by jackh

Thanks for the reply - yes, that would be fine.

comment:4 Changed 6 years ago by bbross

  • Resolution set to fixed
  • Status changed from new to closed

Fixed in the 2016/12 release of the HEVC specification.

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