TX2 访问自带摄像头

启动方法1，–-prev_res 视屏分辨率预览：
nvgstcapture-1.0 --prev-res=3

启动方法2，指定分辨率预览
nvgstcapture-1.0 --cus-prev-res=1920x1080

 

使用gst-launch-1.0 运行GStreamer管道

启动方法3，查看相机的1080p视频

gst-launch-1.0 nvcamerasrc ! 'video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)I420, framerate=(fraction)60/1' ! nvvidconv ! 'video/x-raw(memory:NVMM), format=(string)I420' ! nvoverlaysink -e

启动方法4，查看相机的1080p视频并将真实的fps输出到控制台。

gst-launch-1.0 nvcamerasrc ! 'video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)I420, framerate=(fraction)60/1' ! nvvidconv ! 'video/x-raw(memory:NVMM), format=(string)I420' ! fpsdisplaysink text-overlay=false -v

5：使用opencv访问CSI摄像头需要设置gstreamer管线，如下：

nvcamerasrc ! video/x-raw(memory:NVMM), width=1920, height=(int)1080, format=(string)I420, framerate=(fraction)30/1 ! nvvidconv flip-method=2 ! video/x-raw, format=(string)BGRx ! videoconvert ! video/x-raw, format=(string)BGR ! appsink

代码：

//
#include   
#include   
  
using namespace cv;  
using namespace std;  
  
int main(int argc, char** argv)  
{  
  VideoCapture cap("nvcamerasrc ! video/x-raw(memory:NVMM), width=(int)1280, height=(int)720,format=(string)I420, framerate=(fraction)24/1 ! nvvidconv flip-method=2 ! video/x-raw, format=(string)BGRx ! videoconvert ! video/x-raw, format=(string)BGR ! appsink");  
  if (!cap.isOpened())  
    {  
      cout << "Failed to open camera." << endl;  
      return -1;  
    }  
  
  for(;;)  
    {  
      Mat frame;  
      cap >> frame;  
      imshow("original", frame);  
      waitKey(10); 
    }  
  return 0;  
}  
//