hi_venc_rc_param

说明

定义编码通道码率控制器的高级参数。

定义

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h264_cbr_param": hi_venc_h264_cbr_param }

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h264_vbr_param":  hi_venc_h264_vbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h264_avbr_param": hi_venc_h264_avbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h264_qvbr_param": hi_venc_h264_qvbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h264_cvbr_param": hi_venc_h264_cvbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h265_cbr_param": hi_venc_h265_cbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h265_vbr_param": hi_venc_h265_vbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h265_avbr_param": hi_venc_h265_avbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h265_qvbr_param": hi_venc_h265_qvbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "h265_cvbr_param": hi_venc_h265_cvbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "mjpeg_cbr_param": hi_venc_mjpeg_cbr_param}

hi_venc_rc_param = {"threshold_i": threshold_i[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_p": threshold_p[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "threshold_b": threshold_b[HI_VENC_TEXTURE_THRESHOLD_SIZE],
                    "direction": direction,
                    "row_qp_delta": row_qp_delta,
                    "first_frame_start_qp": first_frame_start_qp,
                    "scene_chg_detect": scene_chg_detect,
                    "mjpeg_vbr_param": hi_venc_mjpeg_vbr_param}

成员

成员名称	描述
threshold_i	列表， I帧宏块级码率控制的Madi（用于度量当前帧的空域纹理复杂度）门限。取值范围：[0, 255]。默认值：[0, 0, 0, 0, 3, 3, 5, 5, 8, 8, 8, 15, 15, 20, 25, 25]。减方向的数值设置为0，表示关闭当前级；加方向的数值设置为255，表示关闭当前级。
threshold_p	列表， P帧宏块级码率控制的Madi门限。取值范围：[0, 255]。默认值：[0, 0, 0, 0, 3, 3, 5, 5, 8, 8, 8, 15, 15, 20, 25, 25]。减方向的数值设置为0，表示关闭当前级；加方向的数值设置为255，表示关闭当前级。
threshold_b	列表， B帧宏块级码率控制的Madi门限。取值范围：[0, 255]。默认值：[0, 0, 0, 0, 3, 3, 5, 5, 8, 8, 8, 15, 15, 20, 25, 25]。减方向的数值设置为0，表示关闭当前级；加方向的数值设置为255，表示关闭当前级。
direction	整型，在基于纹理宏块级码率控制时，用于控制加减方向。。取值范围：[0, 16]。默认值：8。举例，direction = 7表示threshold_i、threshold_p、threshold_b的前7个参数用于 QP减方向；后9个参数用于QP加方向。
row_qp_delta	行级码率控制调节幅度是一帧内行级调节的最大范围，其中行级以宏块行为单位。调节幅度越大，允许行级调整的QP范围越大，码率越平稳。对于图像复杂度分布不均匀的场景，行级码率控制调节幅度设置过大会带来图像质量不均匀。取值范围：[0, 10]，设置为0表示关闭基于行的宏块级码率控制。默认值：1。
first_frame_start_qp	整型，设置第一帧的起始QP值，CBR/VBR/AVBR/QVBR/CVBR模式下，该参数有效。此处第一帧的含义是：通道创建，Gop 模式切换，RC 模式切换，或分辨率切换后，序列的第一个 IDR帧。需要注意如果第一帧编码完成后判定为重编，重编的帧不是第一帧，不受“first_frame_start_qp”的约束。取值范围：[MinIQP, MaxIQP]和-1。“MinIQP”参数值、“MaxIQP”参数值在码率控制模式的高级参数字典内设置。默认值：-1。如果为-1，则第一帧的起始QP由编码器内部计算，如果为其它合法值则由用户通过该参数设置第一帧的起始QP。在低码率、少量运动场景下，如果编码效果不好，可以通过降低该参数值来提升图像质量和效果。例如，在“352*288分辨率，帧率25fps，GOP=50”场景下，将“first_frame_start_qp”设置为32，同时将max_reencode_times参数设置为0（表示不重编码，该参数是以下码率控制模式高级参数之一）。
scene_chg_detect	整型，场景检测相关的控制参数，自适应检测当前编码场景是否发生变化，使能后会改善场景切换时的码率波动，VBR/AVBR/QVBR/CVBR 有效。使能场景切换检测时可使能自适应插入 IDR 帧，在场景切换时编码 IDR 帧，需要注意关闭重编后检测场景切换会失效。该参数建议与编码场景模式的SCENE_0模式配合使用。
h264_cbr_param	字典，H.264通道CBR（Constant Bit Rate）码率控制模式高级参数。
h264_vbr_param	字典，H.264通道VBR（Variable Bit Rate）码率控制模式高级参数。
h264_avbr_param	字典，H.264通道AVBR（Adaptive Variable Bit Rate）码率控制模式高级参数。
h264_qvbr_param	字典，H.264通道QVBR（Quality Variable Bit Rate）码率控制模式高级参数。
h264_cvbr_param	字典，H.264通道CVBR（Constrained Variable Bit Rate）码率控制模式高级参数。
h265_cbr_param	字典，H.265通道CBR（Constant Bit Rate）码率控制模式高级参数。
h265_vbr_param	字典，H.265通道VBR（Variable Bit Rate）码率控制模式高级参数。
h265_avbr_param	字典，H.265通道AVBR（Adaptive Variable Bit Rate）码率控制模式高级参数。
h265_qvbr_param	字典，H.265通道QVBR（Quality Variable Bit Rate）码率控制模式高级参数。
h265_cvbr_param	字典，H.265通道CVBR（Constrained Variable Bit Rate）码率控制模式高级参数。
mjpeg_cbr_param	字典，MJPEG通道CBR（Constant Bit Rate）码率控制模式高级参数。预留参数，暂不支持。
mjpeg_vbr_param	字典，MJPEG通道VBR（Variable Bit Rate）码率控制模式高级参数。预留参数，暂不支持。

父主题： 视频/图像编码