ffmpeg接收媒体流时的设置--转

AVDictionary* options = NULL;
av_dict_set(&options, "buffer_size", "1024000", 0); //增大“buffer_size”参数来提高画质，减少花屏现象
av_dict_set(&options, "max_delay", "500000", 0);    //TCP最大延时
av_dict_set(&options, "stimeout", "20000000", 0);  //设置超时断开连接时间，20S，可避免rtsp连接不上卡死问题
av_dict_set(&options, "rtsp_transport", "tcp", 0);  //以udp方式打开，如果以tcp方式打开将udp替换为tcp  


if(avformat_open_input(&pFormatCtx,url.c_str(),NULL,&options)!=0)
{
    printf("Couldn't open input stream.\n");
    return false;
}