hevc軟件參考手冊(cè)-展示頁(yè)
2025-05-26 00:57本頁(yè)面
【正文】 e syntax. Default is 0 (false). HierarchicalCoding Defines use of hierarchical coding structure. Default is 1 (true). LowDelayCoding Defines use of lowdelay coding structure, which disables all backward inter prediction modes. Default is 0 (false). Table 1 Combination of parameters and their resultant coding structures. LowDelayCoding GPB GOPSize Resultant coding structure 0 0 / 1 1 Hierarchical B (HE default) 1 0 1 Hierarchical P 1 1 1 Hierarchical B, no backward prediction 0 / 1 0 1 IPPP 0 / 1 1 1 IBBB (LC default) Default hierarchicalQP assignments vary according to this parameter. They can be overridden by the parameter BQP. Table 2 Example hierarchical QP assignments according to LowDelayCoding and BQP. Temporal Level LowDelayCoding=0 LowDelayCoding=1 and BQP=0 0 (first frame) QP QP 0 (key frame except the first frame) QP+1 QP+1 1 QP+2 QP+4 2 QP+3 QP+5 3 QP+4 QP+6 GPB Defines use of B pictures for all nonintra pictures. If list 1 reference list is empty when this option is specified, all entries of list 0 reference list are copied into the list 1 reference list. Default is 0 (false). Page: 6 Date Saved: 20210124 NRF Defines marking of pictures in lowest temporal layer as not used for reference. Default is 1 (true). BQP Defines use of hierarchical QP assignment assuming no delay restriction even in lowdelay mode. (See Table 2) Default is 0 (false). TLayeringBasedOnCodingStruct Defines use of temporal layer ID assignment based on the hierarchical coding structure. If this is defined, pictures with higher temporal layer ID than current picture’s temporal layer ID will not be used as reference. Default is 0 (false). TLayerSwitchingFlag_L0 Defines temporal layer switching point flag for temporal layer 0. If this flag is set, then after decoding(encoding) a picture with temporal layer ID equal to 0, all reference pictures with temporal layer ID greater than 0 will be marked as unused. Default is 0 (false). TLayerSwitchingFlag_L1 Defines temporal layer switching point flag for temporal layer 1. If this flag is set, then after decoding(encoding) a picture with temporal layer ID equal to 1, all reference pictures with temporal layer ID greater than 1 will be marked as unused. Default is 0 (false). TLayerSwitchingFlag_L2 Defines temporal layer switching point flag for temporal layer 2. If this flag is set, then after decoding(encoding) a picture with temporal layer ID equal to 2, all reference pictures with temporal layer ID greater than 2 will be marked as unused. Default is 0 (false). TLayerSwitchingFlag_L3 Defines temporal layer switching point flag for temporal layer 3. If this flag is set, then after decoding(encoding) a picture with temporal layer ID equal to 3, all reference pictures with temporal layer ID greater than 3 will be marked as unused. Default is 0 (false). Motion estimation parameters FastSearch Defines use of fast motion search. If this parameter has a value of 0, full search method is used, otherwise, fast motion estimation method is used. Default is 1. Note: the current software allows the value to range from 0 to 2, but only 0 (full) and 1 (fast) are supported. SearchRange Defines the search range used for motion estimation. Default is 96. Shorthand form is –sr. Note: the search range is defined around a predictor. Motion vectors derived by the motion estimation may thus have values larger than the search range. Page: 7 Date Saved: 20210124 BipredSearchRange Defines the search range used for biprediction refinement in the motion estimation. Default is 4. HadamardME Defines use of the Hadamard transform in fractionalpel motion estimation. Otherwise, SAD is used instead. Default is 1 (true). ASR Defines use of adaptive search range, which dynamically adjusts the motion search range according to the POC difference between the current and the reference pictures. Default is 0 (fals
高考資料相關(guān)推薦
鄂ICP備17016276號(hào)-1