hi_venc_h265_fixqp

Description

Defines the FIXQP attributes of an H.265 encoding channel.

For the Atlas inference products, this structure is not supported currently.

Prototype

typedef struct {
    hi_u32 gop;
    hi_u32 src_frame_rate;
    hi_u32 dst_frame_rate;
    hi_u32 i_qp;
    hi_u32 p_qp;
    hi_u32 b_qp;
} hi_venc_h265_fixqp;

Members

Member	Description
gop	Group of pictures. A video sequence includes several temporal continuous pictures. When a video is encoded, the video sequence is divided into several small picture groups. This parameter refers to a quantity of frames in a picture group. The GOP structure supports only Normal P (the first frame is an I-frame and other frames are P-frames). Therefore, this parameter also indicates the I-frame interval. The default value is 65535. The encoding of the I-frame does not need to refer to the previous frame, and the encoding quality of the previous frame is not passed on. Therefore, a smaller value means better encoding quality. However, it is recommended that the value be greater than or equal to the frame rate because the I-frame has only intra-frame prediction blocks. In most scenarios, a certain number of P-frames (with inter-frame prediction blocks) are required to ensure encoding quality. Value range: [1, 65536]
src_frame_rate	Input frame rate of the encoder, in fps, that is, the number of frames that enter the encoder per second. If the bit rate is fixed, a smaller frame rate indicates better encoding quality. However, a bit rate less than 25 can lead to discontinuous frames during playback. You are advised to set this parameter to the actual input frame rate. Value range: [1, 240]
dst_frame_rate	Output frame rate, in fps, that is, the number of frames that exit the encoder per second. If the bit rate is fixed, a smaller frame rate indicates better encoding quality. However, a bit rate less than 25 can lead to discontinuous frames during playback. If the hardware performance is not exceeded (for details about the performance specifications, see Performance Specifications), the actual output frame rate is calculated as follows: (dst_frame_rate/src_frame_rate) x Actual input frame rate. Value range: [1, src_frame_rate] A fractional frame rate is not supported currently.
i_qp	QP values of all macroblocks of I frames. Value range: [0, 51]
p_qp	QP values of all macroblocks of P frames. Value range: [0, 51]
b_qp	QP values of all macroblocks of B frames. Currently, this field can only be set to 0.

Parent topic: VENC/JPEGE