我目前正在开发一个使用ffmepg解码接收到的帧的项目，解码后，我想将AVFrame转换为opencvMat帧，以便我可以在imShow函数上播放它。我有的是字节流，我将它读入缓冲区，解码为AVFrame:f=fopen(filename,"rb");if(!f){fprintf(stderr,"Couldnotopen%s\n",filename);exit(1);}frame=avcodec_alloc_frame();if(!frame){fprintf(stderr,"Couldnotallocatevideoframe\n");exit(1);}framergb=avcode