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

5.12.6.4Syntax cleanups (6 – done)

JCTVC-J0183 Syntax Issues [K. Sato (Sony)]

This contribution addresses 2 syntax issues whose redundancies be removed as follow:

• 
  max_temporal_layers_minus1 and temporal_id_nesting_flag
  
• 
  log2_min_transform_block_size_minus2, diff_cu_qp_delta_depth and transform_skip_enable_flag
  

First issue: Conditional parsing in parameter sets is undesirable, and the benefit in terms of bitrate reduction would be negligible. Instead of introducing conditional conditional parsing in VPS and SPS, another solution was suggested to declare the semantics of temporal_id_nesting_flag as undefined in cases where max_temporal_layers_minus1=0. Decision: Agreed, text to be provided in revised version.

Second issue: Benefit in terms of bitrate reduction would be negligible, and conditional parsing in parameter sets should be avoided. In terms of allocating information to SPS/PPS etc., nothing is wrong with the current draft, and change would only be necessary to enable conditional parsing and avoid parsing dependencies. No action.