[英]How to capture the video from webcam in the interval of 2 minutes using OpenCV
我正在嘗試從網絡攝像頭(Logitech C170)捕獲視頻。 到目前為止,我已經能夠捕獲視頻並將其保存在.avi容器中。
我的C ++代碼如下所示
using namespace std;
using namespace cv;
int main(int, char**)
{
VideoCapture capture(0);
.
.
.
.
VideoWriter video("record.avi", CV_FOURCC('M', 'J', 'P', 'G'), frame_rate, Size(frame_width,frame_height), true);
.
.
.
.
Mat frame;
.
.
.
.
for(;;)
{
capture >> frame;
video.write(frame);
}
return 0;
}
我的下一個目標是
Record Sleep Record
|<------------>|<------------>|<------------>| Goes for infinite loop...
3 Minutes 2 Minutes 3 Minutes
| | |
| | |
v v v
save to Cam goes to sleep save to
/records/1.avi /records/2.avi
我正在使用opencv-2.4.3,代碼在c ++中。
如果我需要其他任何信息,請告訴我。
我怎樣才能做到這一點? 請給您寶貴的建議?
提前致謝。
我建議使用時鍾來測量時間。
循環運行時,請檢查時鍾,一旦達到3分鍾,請切換到睡眠模式功能,直到達到2分鍾的時間,再重新調回。
下面是一些代碼,以時間的函數部分地拆散這個蘇答案。
我確定您可以對其進行編輯以保留錄制時間,並允許您在錄制和睡眠之間進行切換。
希望這可以幫助。
#include <iostream>
#include <cstdio>
#include <ctime>
int main()
{
std::clock_t start;
double duration;
start = std::clock();
// Run your frame grabbing code here //
duration = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;
}
所以,這是解決方案。
#include<iostream>
#include<unistd.h>
#include<sstream>
#include<string>
#include<ctime>
#include<opencv/cv.h>
#include<opencv2/opencv.hpp>
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
string currentDateTime() {
time_t now = time(0);
struct tm tstruct;
char buf[80];
tstruct = *localtime(&now);
strftime(buf, sizeof(buf), "%X", &tstruct);
return buf;
}
int main(int, char**)
{
VideoCapture capture(0);
.
.
.
.
int frame_rate = 10;
.
.
.
.
for(int i = 0; i<4 ; i++) // for infinite loop remove iteration
{
time_t timer_start, timer_stop;
Mat frame;
stringstream recordstr;
recordstr << "records/" << i << ".avi";
string recordfile = recordstr.str();
VideoWriter video(recordfile, CV_FOURCC('M', 'J', 'P', 'G'), frame_rate, Size(frame_width,frame_height), true);
cout<<"video "<<i<<".avi started capturing at "<< currentDateTime() <<endl;
time (&timer_start);
for(int j = 0; j < numFrames; j++){
capture >> frame;
if(frame.empty()){
cout << "Failed to capture an image" << endl;
return -1;
}
video.write(frame);
}
time (&timer_stop);
double timeDifference = difftime (timer_stop, timer_start);
cout<<"video "<<i<<".avi stopped capturing at "<< currentDateTime() <<" & took "<<timeDifference<<" seconds"<<endl;
sleep(60);
}
return 0;
}
輸出為:
video 0.avi started capturing at 12:09:18
video 0.avi stopped capturing at 12:09:55 & took 37 seconds
video 1.avi started capturing at 12:10:55
video 1.avi stopped capturing at 12:11:32 & took 37 seconds
video 2.avi started capturing at 12:12:32
video 2.avi stopped capturing at 12:13:09 & took 37 seconds
我將不勝感激任何其他解決方案。 因此,如果有的話,請發表。
謝謝
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