ffmepg 指定RTSP网络连接模式UDP还是TCP

 AVFormatContext *formatCtx = NULL;
 formatCtx = avformat_alloc_context();

 AVDictionary* options = NULL;
 av_dict_set(&options, "rtsp_transport", "tcp", 0);

 avformat_open_input(&formatCtx, pszURLPath, NULL, &options) < 0);