JCTVC-M0353 Non-SCE5: Cross-verification of JCTVC-M0112 on position derivation for using Base Layer motion in SHVC [V. Seregin (Qualcomm)] [late]
JCTVC-M0113 Non-SCE5: Availability of Base Layer motion in SHVC [C. Gisquet, P. Onno, E. François, G. Laroche (Canon)]
This contribution reports the issue of availability of motion information in a Base Layer when the Base Layer temporal MVP has been disabled at the sequence level.
JCTVC-M0120 On signalling the syntax ‘sps_inter_layer_mfm_enable_flag’ [H. Lee, J. W. Kang, J. Lee, J. S. Choi (ETRI)]
In the reference index based SHVC framework, when the sps_inter_layer_mfm_enable_flag in SPS extension is equal to 1, motion field mapping process between the current layer and its reference layer is performed in order to use the inter-layer reference picture as a collocated picture for TMVP derivation. In this proposal, it is asserted that sps_inter_layer_mfm_enable_flag should be sent only when sps_temporal_mvp_enabled_flag is equal to 1 since, if TMVP is not used, sps_inter_layer_mfm_enable_ flag should always be equal to 0. In addition, it is proposed to add constraint on collocated_ref_idx for TMVP not to indicate inter-layer reference picture when sps_inter_layer_mfm_enable_flag is equal to 0. This proposal also provides approaches for adding constraint on collocated picture for TMVP derivation for reducing the memory requirement of motion information of reference picture in the reference index based SHVC framework.
Further study on the aspects of M0113 and M0120; the final way of how base layer motion vectors are used in EL is further being investigated, and therefore it would be premature to make these definitions; another option would be to disallow certain combinations (e.g. disabling base layer TMVP and enabling usage of BL MV in enhancement layer at the same time). W.r.t. necessary memory for MV storage, this should be up to profile/level definitions.
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