VkVideoEncodeH264NaluSliceInfoKHR(3)

# VkVideoEncodeH264NaluSliceInfoKHR(3) Manual Page

## Name

VkVideoEncodeH264NaluSliceInfoKHR - Structure specifies H.264 encode slice NALU parameters

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## C Specification

The VkVideoEncodeH264NaluSliceInfoKHR structure is defined as:

    // Provided by VK_KHR_video_encode_h264
    typedef struct VkVideoEncodeH264NaluSliceInfoKHR {
        VkStructureType                         sType;
        const void*                             pNext;
        int32_t                                 constantQp;
        const StdVideoEncodeH264SliceHeader*    pStdSliceHeader;
    } VkVideoEncodeH264NaluSliceInfoKHR;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `constantQp` is the QP to use for the slice if the current rate control mode configured for the video session is `VK_VIDEO_ENCODE_RATE_CONTROL_MODE_DISABLED_BIT_KHR`.

- `pStdSliceHeader` is a pointer to a `StdVideoEncodeH264SliceHeader` structure specifying H.264 slice header parameters for the slice.

## Description

Std Slice Header Parameters

  The members of the `StdVideoEncodeH264SliceHeader` structure pointed to by `pStdSliceHeader` are interpreted as follows:

  - `flags.reserved` and `reserved1` are used only for padding purposes and are otherwise ignored;

  - if `pWeightTable` is not `NULL`, then it is a pointer to a `StdVideoEncodeH264WeightTable` that is interpreted as follows:

    - `flags.reserved` is used only for padding purposes and is otherwise ignored;

    - all other members of `StdVideoEncodeH264WeightTable` are interpreted as defined in section 7.4.3.2 of the ITU-T H.264 Specification;

  - all other members are interpreted as defined in section 7.4.3 of the ITU-T H.264 Specification.

Valid Usage (Implicit)

- VUID-VkVideoEncodeH264NaluSliceInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_ENCODE_H264_NALU_SLICE_INFO_KHR`

- VUID-VkVideoEncodeH264NaluSliceInfoKHR-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkVideoEncodeH264NaluSliceInfoKHR-pStdSliceHeader-parameter
  `pStdSliceHeader` must be a valid pointer to a valid `StdVideoEncodeH264SliceHeader` value

## See Also

VK_KHR_video_encode_h264, VkStructureType, VkVideoEncodeH264PictureInfoKHR

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0