---
title: hi_venc_gop_bipred_b
description: "定义编码B帧GOP属性字典，暂不支持。"
url: https://www.hiascend.com/document/detail/zh/canncommercial/latest/API/dvpp/aclpythondevg_01_0642.html
sourcePath: /source/zh/canncommercial/900/API/dvpp/aclpythondevg_01_0642.html
indexId: a212bd457cde6f2c4545c2cb53200bc3d2e389b9428adeee66392b10f8be576065
---
# hi_venc_gop_bipred_b

#### 说明

定义编码B帧GOP属性字典，暂不支持。


#### 定义

```
hi_venc_gop_bipred_b = {"b_frame_num": b_frame_num, # RW; Range:[1, 3]; Number of B frames
"b_qp_delta": b_qp_delta, # RW; Range:[-10, 30]; QP variance between P frame and B frame
"ip_qp_delta": ip_qp_delta} # RW; Range:[-10, 30]; QP variance between P frame and I frame
```