OpenCV VideoCapture根本無法從我的網絡攝像頭中讀取

Question

我在Ubuntu 13.04上使用OpenCV 2.4.6（在Acer C7 Chromebook上），我正在使用一個簡單的測試程序來查看我的網絡攝像頭是否適用於OpenCV。 它適用於Cheese和Skype，所以我知道網絡攝像頭本身不是問題。

這是我的代碼（編譯時沒有任何錯誤）：

#include "opencv2/opencv.hpp"
#include <stdio.h>
#include <stdlib.h>

using namespace std;
using namespace cv;

int main(int argc, char *argv[])
{
  cv::VideoCapture cap;
  if(argc > 1)
    {
      cap.open(string(argv[1]));
    }
  else
    {
      cap.open(CV_CAP_ANY);
    }
  if(!cap.isOpened())
    {
      printf("Error: could not load a camera or video.\n");
    }
  Mat frame;
  namedWindow("video", 1);
  for(;;)
  {
    waitKey(20);
    cap >> frame;
  if(!frame.data)
    {
      printf("Error: no frame data.\n");
      break;
    }
    imshow("video", frame);
  }
}

如果我在沒有任何參數的情況下運行程序（因為我希望它使用CV_CAP_ANY），我得到了

Error: could not load a camera or video.
init done 
opengl support available 
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
Error: no frame data.

如果我指定/ dev / video0（我唯一的相機）作為參數，我得到

demux_wavpack: (open_wv_file:127) open_wv_file: non-seekable inputs aren't supported yet.
(ERROR)icvOpenAVI_XINE(): Unable to open source '/dev/video0'
init done 
opengl support available 
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
libpng warning: Application built with libpng-1.2.49 but running with 1.5.12
GStreamer Plugin: Embedded video playback halted; module source reported: Could not read from resource.
Error: no frame data.

如果我指定視頻文件的路徑作為參數，它就可以正常播放視頻。

我很感激任何幫助。 提前致謝！

Answer 1

Opencv 2.4.6上有一個錯誤請看這里

試試這個：cv :: VideoCapture cap = cv :: VideoCapture（0）;

希望它有所幫助！

Answer 2

您可以嘗試將waitKey(20)值更改為20直到80.某些計算機的值為20,30,40,50 ....