AVDictionary* options = nullptr;
    av_dict_set(&options, "timeout", "3000000", 0);  //设置超时断开连接时间  
    if (avformat_open_input(&pFormatCtx, url, NULL, &options) != 0) {
        printf("Couldn't open input stream.（无法打开输入流）\n");
        return -1;
    }

​​https://www.jianshu.com/p/e75e3f1fb6b0?tdsourcetag=s_pcqq_aiomsg​​