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D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR_0080 structure (d3d12umddi.h)

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The D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR_0080 structure contains the rate control definition for constant bitrate (CBR) mode.

Syntax

typedef struct D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR_0080 {
  UINT   InitialQP;
  UINT   MinQP;
  UINT   MaxQP;
  UINT64 MaxFrameBitSize;
  UINT64 TargetBitRate;
  UINT64 VBVCapacity;
  UINT64 InitialVBVFullness;
} D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR_0080;

Members

InitialQP

When the D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_INITIAL_QP flag is set, InitialQP can be used by the rate control algorithm.

MinQP

When the D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_QP_RANGE flag is set, MinQP limits the quantization parameter (QP) range of the rate control algorithm.

MaxQP

When the D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_QP_RANGE flag is set, MaxQP limits the QP range of the rate control algorithm.

MaxFrameBitSize

Maximum size for each frame to be encoded, in bits. When D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_MAX_FRAME_SIZE is set, MaxFrameBitSize limits each frame's maximum size in the rate control algorithm.

TargetBitRate

The constant bitrate to be used, in bits per second.

VBVCapacity

When D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_1_ENABLE_VBV_SIZES is set, VBVCapacity specifies the capacity, in bits, of the Video Buffer Verifier (VBV) to be used in the rate control algorithm.

InitialVBVFullness

When D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_1_ENABLE_VBV_SIZES is set, InitialVBVFullness specifies the initial fullness, in bits, of the VBV to be used in the rate control algorithm.

Remarks

See D3D12 video encoding for general information.

Requirements

Requirement Value
Minimum supported client Windows 11 (WDDM 3.0)
Header d3d12umddi.h

See also

D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CONFIGURATION_PARAMS_0080_2

D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAGS_0080