VulkanHub
Enum

VkVideoEncodeAV1RateControlGroupKHR

AV1 encode rate control group

Possible AV1 encode rate control groups are as follows:

typedef enum VkVideoEncodeAV1RateControlGroupKHR {
    VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_INTRA_KHR = 0,
    VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_PREDICTIVE_KHR = 1,
    VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_BIPREDICTIVE_KHR = 2,
} VkVideoEncodeAV1RateControlGroupKHR;
  • VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_INTRA_KHR should be specified when encoding AV1 frames that use intra-only prediction (e.g. when encoding AV1 frames of type STD_VIDEO_AV1_FRAME_TYPE_KEY or STD_VIDEO_AV1_FRAME_TYPE_INTRA_ONLY).
  • VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_PREDICTIVE_KHR should be specified when encoding AV1 frames that only have forward references in display order.
  • VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_BIPREDICTIVE_KHR should be specified when encoding AV1 frames that have backward references in display order.

While the application can specify any rate control group for any frame, indifferent of the frame type, prediction mode, or prediction direction, specifying a rate control group that does not reflect the prediction direction used by the encoded frame may result in unexpected behavior of the implementation’s rate control algorithm.