opencv - 使用 OpenCV 从 AXIS 网络摄像机读取图像

Question

我正在尝试使用 OpenCV 从我的程序访问 AXIS IP 摄像机。我的 OpenCV 版本是 3.1。我遵循本教程 link .

我已经安装了所有库。我的以下程序可以成功加载 mp4 视频。这意味着 ffmpeg 和必要的库工作正常。

#include <iostream>
#include <opencv2/opencv.hpp>

using namespace std;
int main() {
    cv::VideoCapture vcap("test.mp4");
    cv::Mat image;
//    const string address = "rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1";
//    if(!vcap.open(address)){
//      std::cout << "Error opening video stream or file " << std::endl;
//      return -1;
//    }
    for(;;){
        if(!vcap.read(image)){
            std::cout << "No frame" << std::endl;
            cv::waitKey(0);
        }
        cv::imshow("Display", image);
        cv::waitKey(1);
    }
    return 0;
}

当我尝试如下访问网络摄像机时

cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");

我有以下错误

GStreamer Plugin: Embedded video playback halted; module source reported: Could 
not open resource for reading and writing.
OpenCV Error: Unspecified error (GStreamer: unable to start pipeline
) in cvCaptureFromCAM_GStreamer, file /home/Softwares/opencv/opencv/modules
/videoio/src/cap_gstreamer.cpp, line 818
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/Softwares/opencv/opencv/modules/videoio/src/cap_gstreamer.
cpp:818: error: (-2) GStreamer: unable to start pipeline
 in function cvCaptureFromCAM_GStreamer

用户是root，密码是pass，ip都是默认的192.168.0.90

我的 if 配置给了我

ifconfig
eth0      Link encap:Ethernet  HWaddr b8:2a:72:c6:b8:13  
          inet6 addr: fe80::ba2a:72ff:fec6:b813/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:723959 errors:0 dropped:0 overruns:0 frame:0
          TX packets:116637 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:199422245 (199.4 MB)  TX bytes:13701699 (13.7 MB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:24829 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24829 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2502903 (2.5 MB)  TX bytes:2502903 (2.5 MB)

wlan0     Link encap:Ethernet  HWaddr a0:a8:cd:99:92:60  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

访问摄像头可能是什么问题？

谢谢

Answer 1

问题出在网络配置上。我需要如下设置静态 IP 地址。

auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.1
dns-nameservers 192.168.0.1

然后重启电脑。

之后就可以使用了

cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");