# VkVideoEncodeH264RateControlFlagBitsKHR(3) Manual Page

## Name

VkVideoEncodeH264RateControlFlagBitsKHR - H.264 encode rate control bits

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## C Specification

Bits which can be set in VkVideoEncodeH264RateControlInfoKHR::`flags`, specifying H.264 rate control flags, are:

    // Provided by VK_KHR_video_encode_h264
    typedef enum VkVideoEncodeH264RateControlFlagBitsKHR {
        VK_VIDEO_ENCODE_H264_RATE_CONTROL_ATTEMPT_HRD_COMPLIANCE_BIT_KHR = 0x00000001,
        VK_VIDEO_ENCODE_H264_RATE_CONTROL_REGULAR_GOP_BIT_KHR = 0x00000002,
        VK_VIDEO_ENCODE_H264_RATE_CONTROL_REFERENCE_PATTERN_FLAT_BIT_KHR = 0x00000004,
        VK_VIDEO_ENCODE_H264_RATE_CONTROL_REFERENCE_PATTERN_DYADIC_BIT_KHR = 0x00000008,
        VK_VIDEO_ENCODE_H264_RATE_CONTROL_TEMPORAL_LAYER_PATTERN_DYADIC_BIT_KHR = 0x00000010,
    } VkVideoEncodeH264RateControlFlagBitsKHR;

## Description

- `VK_VIDEO_ENCODE_H264_RATE_CONTROL_ATTEMPT_HRD_COMPLIANCE_BIT_KHR` specifies that rate control should attempt to produce an HRD compliant bitstream, as defined in annex C of the ITU-T H.264 Specification.

- `VK_VIDEO_ENCODE_H264_RATE_CONTROL_REGULAR_GOP_BIT_KHR` specifies that the application intends to use a regular GOP structure according to the parameters specified in the `gopFrameCount`, `idrPeriod`, and `consecutiveBFrameCount` members of the VkVideoEncodeH264RateControlInfoKHR structure.

- `VK_VIDEO_ENCODE_H264_RATE_CONTROL_REFERENCE_PATTERN_FLAT_BIT_KHR` specifies that the application intends to follow a flat reference pattern in the GOP.

- `VK_VIDEO_ENCODE_H264_RATE_CONTROL_REFERENCE_PATTERN_DYADIC_BIT_KHR` specifies that the application intends to follow a dyadic reference pattern in the GOP.

- `VK_VIDEO_ENCODE_H264_RATE_CONTROL_TEMPORAL_LAYER_PATTERN_DYADIC_BIT_KHR` specifies that the application intends to follow a dyadic temporal layer pattern.

## See Also

VK_KHR_video_encode_h264, VkVideoEncodeH264RateControlFlagsKHR

## 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