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关于dm36x关键帧延时的问题

专家您好:

       我现在用的是dm36x ipnc 5.1的sdk,在打开视频是发现有时视频出来比慢,有4,5秒的延时,我们打开视频时有调用函数SendForceIFrameMsg(1); // Force IDR and Sync once streaming starts;我们现在用的参数是fps=12,keyFrameInterval=30;我们需要调用函数SendForceIFrameMsg(1)后,立即取到关键帧;调试跟踪发现命令已发到av_server,但是关键帧还是延时比较大,4,5秒。