# VkVideoEncodeH264StdFlagBitsKHR(3) Manual Page

## Name

VkVideoEncodeH264StdFlagBitsKHR - Video encode H.264 syntax capability flags

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## C Specification

Bits which may be set in VkVideoEncodeH264CapabilitiesKHR::`stdSyntaxFlags`, indicating the capabilities related to the H.264 syntax elements, are:

    // Provided by VK_KHR_video_encode_h264
    typedef enum VkVideoEncodeH264StdFlagBitsKHR {
        VK_VIDEO_ENCODE_H264_STD_SEPARATE_COLOR_PLANE_FLAG_SET_BIT_KHR = 0x00000001,
        VK_VIDEO_ENCODE_H264_STD_QPPRIME_Y_ZERO_TRANSFORM_BYPASS_FLAG_SET_BIT_KHR = 0x00000002,
        VK_VIDEO_ENCODE_H264_STD_SCALING_MATRIX_PRESENT_FLAG_SET_BIT_KHR = 0x00000004,
        VK_VIDEO_ENCODE_H264_STD_CHROMA_QP_INDEX_OFFSET_BIT_KHR = 0x00000008,
        VK_VIDEO_ENCODE_H264_STD_SECOND_CHROMA_QP_INDEX_OFFSET_BIT_KHR = 0x00000010,
        VK_VIDEO_ENCODE_H264_STD_PIC_INIT_QP_MINUS26_BIT_KHR = 0x00000020,
        VK_VIDEO_ENCODE_H264_STD_WEIGHTED_PRED_FLAG_SET_BIT_KHR = 0x00000040,
        VK_VIDEO_ENCODE_H264_STD_WEIGHTED_BIPRED_IDC_EXPLICIT_BIT_KHR = 0x00000080,
        VK_VIDEO_ENCODE_H264_STD_WEIGHTED_BIPRED_IDC_IMPLICIT_BIT_KHR = 0x00000100,
        VK_VIDEO_ENCODE_H264_STD_TRANSFORM_8X8_MODE_FLAG_SET_BIT_KHR = 0x00000200,
        VK_VIDEO_ENCODE_H264_STD_DIRECT_SPATIAL_MV_PRED_FLAG_UNSET_BIT_KHR = 0x00000400,
        VK_VIDEO_ENCODE_H264_STD_ENTROPY_CODING_MODE_FLAG_UNSET_BIT_KHR = 0x00000800,
        VK_VIDEO_ENCODE_H264_STD_ENTROPY_CODING_MODE_FLAG_SET_BIT_KHR = 0x00001000,
        VK_VIDEO_ENCODE_H264_STD_DIRECT_8X8_INFERENCE_FLAG_UNSET_BIT_KHR = 0x00002000,
        VK_VIDEO_ENCODE_H264_STD_CONSTRAINED_INTRA_PRED_FLAG_SET_BIT_KHR = 0x00004000,
        VK_VIDEO_ENCODE_H264_STD_DEBLOCKING_FILTER_DISABLED_BIT_KHR = 0x00008000,
        VK_VIDEO_ENCODE_H264_STD_DEBLOCKING_FILTER_ENABLED_BIT_KHR = 0x00010000,
        VK_VIDEO_ENCODE_H264_STD_DEBLOCKING_FILTER_PARTIAL_BIT_KHR = 0x00020000,
        VK_VIDEO_ENCODE_H264_STD_SLICE_QP_DELTA_BIT_KHR = 0x00080000,
        VK_VIDEO_ENCODE_H264_STD_DIFFERENT_SLICE_QP_DELTA_BIT_KHR = 0x00100000,
    } VkVideoEncodeH264StdFlagBitsKHR;

## Description

- VK_VIDEO_ENCODE_H264_STD_SEPARATE_COLOR_PLANE_FLAG_SET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264SpsFlags`::`separate_colour_plane_flag` in the SPS when that value is `1`.

- VK_VIDEO_ENCODE_H264_STD_QPPRIME_Y_ZERO_TRANSFORM_BYPASS_FLAG_SET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264SpsFlags`::`qpprime_y_zero_transform_bypass_flag` in the SPS when that value is `1`.

- VK_VIDEO_ENCODE_H264_STD_SCALING_MATRIX_PRESENT_FLAG_SET_BIT_KHR specifies whether the implementation supports using the application-provided values for `StdVideoH264SpsFlags`::`seq_scaling_matrix_present_flag` in the SPS and `StdVideoH264PpsFlags`::`pic_scaling_matrix_present_flag` in the PPS when any of those values are `1`.

- VK_VIDEO_ENCODE_H264_STD_CHROMA_QP_INDEX_OFFSET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PictureParameterSet`::`chroma_qp_index_offset` in the PPS when that value is non-zero.

- VK_VIDEO_ENCODE_H264_STD_SECOND_CHROMA_QP_INDEX_OFFSET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PictureParameterSet`::`second_chroma_qp_index_offset` in the PPS when that value is non-zero.

- VK_VIDEO_ENCODE_H264_STD_PIC_INIT_QP_MINUS26_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PictureParameterSet`::`pic_init_qp_minus26` in the PPS when that value is non-zero.

- VK_VIDEO_ENCODE_H264_STD_WEIGHTED_PRED_FLAG_SET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PpsFlags`::`weighted_pred_flag` in the PPS when that value is `1`.

- VK_VIDEO_ENCODE_H264_STD_WEIGHTED_BIPRED_IDC_EXPLICIT_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PictureParameterSet`::`weighted_bipred_idc` in the PPS when that value is `STD_VIDEO_H264_WEIGHTED_BIPRED_IDC_EXPLICIT`.

- VK_VIDEO_ENCODE_H264_STD_WEIGHTED_BIPRED_IDC_IMPLICIT_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PictureParameterSet`::`weighted_bipred_idc` in the PPS when that value is `STD_VIDEO_H264_WEIGHTED_BIPRED_IDC_IMPLICIT`.

- VK_VIDEO_ENCODE_H264_STD_TRANSFORM_8X8_MODE_FLAG_SET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PpsFlags`::`transform_8x8_mode_flag` in the PPS when that value is `1`.

- VK_VIDEO_ENCODE_H264_STD_DIRECT_SPATIAL_MV_PRED_FLAG_UNSET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoEncodeH264SliceHeaderFlags`::`direct_spatial_mv_pred_flag` in the H.264 slice header parameters when that value is `0`.

- VK_VIDEO_ENCODE_H264_STD_ENTROPY_CODING_MODE_FLAG_UNSET_BIT_KHR specifies whether the implementation supports CAVLC entropy coding, as defined in section 9.2 of the ITU-T H.264 Specification, and thus supports using the application-provided value for `StdVideoH264PpsFlags`::`entropy_coding_mode_flag` in the PPS when that value is `0`.

- VK_VIDEO_ENCODE_H264_STD_ENTROPY_CODING_MODE_FLAG_SET_BIT_KHR specifies whether the implementation supports CABAC entropy coding, as defined in section 9.3 of the ITU-T H.264 Specification, and thus supports using the application-provided value for `StdVideoH264PpsFlags`::`entropy_coding_mode_flag` in the PPS when that value is `1`.

- VK_VIDEO_ENCODE_H264_STD_DIRECT_8X8_INFERENCE_FLAG_UNSET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264SpsFlags`::`direct_8x8_inference_flag` in the SPS when that value is `0`.

- VK_VIDEO_ENCODE_H264_STD_CONSTRAINED_INTRA_PRED_FLAG_SET_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoH264PpsFlags`::`constrained_intra_pred_flag` in the PPS when that value is `1`.

- VK_VIDEO_ENCODE_H264_STD_DEBLOCKING_FILTER_DISABLED_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoEncodeH264SliceHeader`::`disable_deblocking_filter_idc` in the H.264 slice header parameters when that value is `STD_VIDEO_H264_DISABLE_DEBLOCKING_FILTER_IDC_DISABLED`.

- VK_VIDEO_ENCODE_H264_STD_DEBLOCKING_FILTER_ENABLED_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoEncodeH264SliceHeader`::`disable_deblocking_filter_idc` in the H.264 slice header parameters when that value is `STD_VIDEO_H264_DISABLE_DEBLOCKING_FILTER_IDC_ENABLED`.

- VK_VIDEO_ENCODE_H264_STD_DEBLOCKING_FILTER_PARTIAL_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoEncodeH264SliceHeader`::`disable_deblocking_filter_idc` in the H.264 slice header parameters when that value is `STD_VIDEO_H264_DISABLE_DEBLOCKING_FILTER_IDC_PARTIAL`.

- VK_VIDEO_ENCODE_H264_STD_SLICE_QP_DELTA_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoEncodeH264SliceHeader`::`slice_qp_delta` in the H.264 slice header parameters when that value is identical across the slices of the encoded frame.

- VK_VIDEO_ENCODE_H264_STD_DIFFERENT_SLICE_QP_DELTA_BIT_KHR specifies whether the implementation supports using the application-provided value for `StdVideoEncodeH264SliceHeader`::`slice_qp_delta` in the H.264 slice header parameters when that value is different across the slices of the encoded frame.

These capability flags provide information to the application about specific H.264 syntax element values that the implementation supports without having to override them and do not otherwise restrict the values that the application can specify for any of the mentioned H.264 syntax elements.

## See Also

VK_KHR_video_encode_h264, VkVideoEncodeH264StdFlagsKHR

## 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 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0