dm368 idrFrameInterval设置不起作用

代码如下：

IH264VENC_Params externParams;
IH264VENC_DynamicParams externDynamicParams;

externParams.videncParams.size = sizeof(IH264VENC_Params);
externDynamicParams.videncDynamicParams.size = sizeof(IH264VENC_DynamicParams);

externDynamicParams.videncDynamicParams = dynParams;
externDynamicParams.idrFrameInterval = 25;

hVe1 = Venc1_create(hEngine, args->codecName, &params, (VIDENC1_DynamicParams*)&externDynamicParams);