nded_spatial_scalability_idc is equal to 2), geometrical parameters are not present in the subset sequence parameter set, but they are present in the slice headers with no_inter_layer_pred_flag equal to 0 and quality id equal to 0 that refer to this subset sequence parameter set. chroma specifies the horizontal phase shift of the chroma components in units of half luma samples of a frame or layer frame. When chroma_phase_x_plus1_flagis not present, it shall be inferred to be equal to 1. ChromaArrayType equal chroma_sample_loc_type_top_field chroma_sample_loc_type_bottom_field are present, the following applies: chroma_phase_x_plus1_flag is equal chroma_sample_loc_type_top_field chroma_sample_loc_type_bottom_fieldshould be equal to 0, 2, or 4. Otherwise (chroma_phase_x_plus1_flag is equal to 1), hroma_sample_loc_type_top_field chroma_sample_loc_type_bottom_fieldshould be equal to 1, 3, or 5. When ChromaArrayType is equal to 2, chroma_phase_x_plus1_flag should equal to 1. chroma_phase_y_plus1 specifies the vertical phase shift of the chroma components in units of half luma samples of a frame or layer frame. When plus1 is not present, it shall be inferred to be equal to 1. The value of shall be in the range of 0 to 2, inclusive. ChromaArrayType equal chroma_sample_loc_type_top_fielo chroma_sample_loc_type_bottom_fieldarepresent, the following applies: chroma_phase_y_plusl equal chroma_sample_loc_type_top_field chroma_sample_loc_type_bottom_fields should be equal to 2 or 3. Otherwise, if chroma_phase_y_plus is equal to chroma_sample_loc_type_top_field chroma_sample_loc_type_bottom_fieldshould be equal to 0 or Otherwise (chroma_phase_y_plus is equal to chroma_sample_loc_type_top_field roma_sample_loc_type_bottom_fielo should be equal to 4 or 5. seq_ref_layer_chroma_phase_x_plus1_flagspecifies the horizontal phase shift of the chroma components in units of half luma samples of a layer frame for the layer pictures that may be used for inter-layer prediction. When seq_ref_layer_chroma_phase_x_plus1_flagis notpresent, it 