HEVC参照ソフトウェアHMのrandom accessのGOPを４にするには

圧縮ソフトウェア

HEVC参照ソフトウェアHMのrandom accessコンフィギュレーションでは、デフォルトでGOPは8となっている。

HMのドキュメントではGOPを４にした場合の例が載っていたので、それを実装する。

具体的にはCoding Structureの部分を以下のように書き換える。

 

#======== Coding Structure =============
IntraPeriod : 32 # Period of I-Frame ( -1 = only first)
DecodingRefreshType : 1 # Random Accesss 0:none, 1:CRA, 2:IDR, 3:Recovery Point SEI
GOPSize : 4 # GOP Size (number of B slice = GOPSize-1)
# Type POC QPoffset QPfactor tcOffsetDiv2 betaOffsetDiv2 temporal_id　#ref_pics_active #ref_pics reference pictures predict deltaRPS #ref_idcs reference idcs
Frame1: P 4 1 0.5 0 0 0 1 1 -4 0
Frame2: B 2 2 0.5 1 0 1 1 2 -2 2 1 2 2 1 1 
Frame3: B 1 3 0.5 2 0 2 1 3 -1 1 3 1 1 3 1 1 1
Frame4: B 3 3 0.5 2 0 2 1 2 -1 -1 1 -2 4 0 1 1 0

 

念の為、コード全体を以下に示す。

(encoder_randomaccess_main_GOP4.cfg)

 

#======== File I/O =====================
BitstreamFile : str.bin
ReconFile : rec.yuv

#======== Profile ================
Profile : main

#======== Unit definition ================
MaxCUWidth : 64 # Maximum coding unit width in pixel
MaxCUHeight : 64 # Maximum coding unit height in pixel
MaxPartitionDepth : 4 # Maximum coding unit depth
QuadtreeTULog2MaxSize : 5 # Log2 of maximum transform size for
# quadtree-based TU coding (2...6)
QuadtreeTULog2MinSize : 2 # Log2 of minimum transform size for
# quadtree-based TU coding (2...6)
QuadtreeTUMaxDepthInter : 3
QuadtreeTUMaxDepthIntra : 3

#======== Coding Structure =============
IntraPeriod : 32 # Period of I-Frame ( -1 = only first)
DecodingRefreshType : 1 # Random Accesss 0:none, 1:CRA, 2:IDR, 3:Recovery Point SEI
GOPSize : 4 # GOP Size (number of B slice = GOPSize-1)
# Type POC QPoffset QPfactor tcOffsetDiv2 betaOffsetDiv2 temporal_id #ref_pics_active #ref_pics reference pictures predict deltaRPS #ref_idcs reference idcs
Frame1: P 4 1 0.5 0 0 0 1 1 -4 0
Frame2: B 2 2 0.5 1 0 1 1 2 -2 2 1 2 2 1 1
Frame3: B 1 3 0.5 2 0 2 1 3 -1 1 3 1 1 3 1 1 1
Frame4: B 3 3 0.5 2 0 2 1 2 -1 -1 1 -2 4 0 1 1 0

#=========== Motion Search =============
FastSearch : 1 # 0:Full search 1:TZ search
SearchRange : 64 # (0: Search range is a Full frame)
BipredSearchRange : 4 # Search range for bi-prediction refinement
HadamardME : 1 # Use of hadamard measure for fractional ME
FEN : 1 # Fast encoder decision
FDM : 1 # Fast Decision for Merge RD cost

#======== Quantization =============
QP : 32 # Quantization parameter(0-51)
MaxDeltaQP : 0 # CU-based multi-QP optimization
MaxCuDQPDepth : 0 # Max depth of a minimum CuDQP for sub-LCU-level delta QP
DeltaQpRD : 0 # Slice-based multi-QP optimization
RDOQ : 1 # RDOQ
RDOQTS : 1 # RDOQ for transform skip

#=========== Deblock Filter ============
DeblockingFilterControlPresent: 0 # Dbl control params present (0=not present, 1=present)
LoopFilterOffsetInPPS : 0 # Dbl params: 0=varying params in SliceHeader, param = base_param + GOP_offset_param; 1=constant params in PPS, param = base_param)
LoopFilterDisable : 0 # Disable deblocking filter (0=Filter, 1=No Filter)
LoopFilterBetaOffset_div2 : 0 # base_param: -6 ~ 6
LoopFilterTcOffset_div2 : 0 # base_param: -6 ~ 6
DeblockingFilterMetric : 0 # blockiness metric (automatically configures deblocking parameters in bitstream)

#=========== Misc. ============
InternalBitDepth : 8 # codec operating bit-depth

#=========== Coding Tools =================
SAO : 1 # Sample adaptive offset (0: OFF, 1: ON)
AMP : 1 # Asymmetric motion partitions (0: OFF, 1: ON)
TransformSkip : 1 # Transform skipping (0: OFF, 1: ON)
TransformSkipFast : 1 # Fast Transform skipping (0: OFF, 1: ON)
SAOLcuBoundary : 0 # SAOLcuBoundary using non-deblocked pixels (0: OFF, 1: ON)

#============ Slices ================
SliceMode : 0 # 0: Disable all slice options.
# 1: Enforce maximum number of LCU in an slice,
# 2: Enforce maximum number of bytes in an 'slice'
# 3: Enforce maximum number of tiles in a slice
SliceArgument : 1500 # Argument for 'SliceMode'.
# If SliceMode==1 it represents max. SliceGranularity-sized blocks per slice.
# If SliceMode==2 it represents max. bytes per slice.
# If SliceMode==3 it represents max. tiles per slice.

LFCrossSliceBoundaryFlag : 1 # In-loop filtering, including ALF and DB, is across or not across slice boundary.
# 0:not across, 1: across

#============ PCM ================
PCMEnabledFlag : 0 # 0: No PCM mode
PCMLog2MaxSize : 5 # Log2 of maximum PCM block size.
PCMLog2MinSize : 3 # Log2 of minimum PCM block size.
PCMInputBitDepthFlag : 1 # 0: PCM bit-depth is internal bit-depth. 1: PCM bit-depth is input bit-depth.
PCMFilterDisableFlag : 0 # 0: Enable loop filtering on I_PCM samples. 1: Disable loop filtering on I_PCM samples.

#============ Tiles ================
TileUniformSpacing : 0 # 0: the column boundaries are indicated by TileColumnWidth array, the row boundaries are indicated by TileRowHeight array
# 1: the column and row boundaries are distributed uniformly
NumTileColumnsMinus1 : 0 # Number of tile columns in a picture minus 1
TileColumnWidthArray : 2 3 # Array containing tile column width values in units of CTU (from left to right in picture)
NumTileRowsMinus1 : 0 # Number of tile rows in a picture minus 1
TileRowHeightArray : 2 # Array containing tile row height values in units of CTU (from top to bottom in picture)

LFCrossTileBoundaryFlag : 1 # In-loop filtering is across or not across tile boundary.
# 0:not across, 1: across

#============ WaveFront ================
WaveFrontSynchro : 0 # 0: No WaveFront synchronisation (WaveFrontSubstreams must be 1 in this case).
# >0: WaveFront synchronises with the LCU above and to the right by this many LCUs.

#=========== Quantization Matrix =================
ScalingList : 0 # ScalingList 0 : off, 1 : default, 2 : file read
ScalingListFile : scaling_list.txt # Scaling List file name. If file is not exist, use Default Matrix.

#============ Lossless ================
TransquantBypassEnableFlag : 0 # Value of PPS flag.
CUTransquantBypassFlagForce: 0 # Force transquant bypass mode, when transquant_bypass_enable_flag is enabled

#============ Rate Control ======================
RateControl : 0 # Rate control: enable rate control
TargetBitrate : 1000000 # Rate control: target bitrate, in bps
KeepHierarchicalBit : 2 # Rate control: 0: equal bit allocation; 1: fixed ratio bit allocation; 2: adaptive ratio bit allocation
LCULevelRateControl : 1 # Rate control: 1: LCU level RC; 0: picture level RC
RCLCUSeparateModel : 1 # Rate control: use LCU level separate R-lambda model
InitialQP : 0 # Rate control: initial QP
RCForceIntraQP : 0 # Rate control: force intra QP to be equal to initial QP

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