Hi,
I am working on opencv version 2.4.8 under Ubuntu 12.04 LTS environment.
I am facing problem while creating a video ,while capturing from a webcam (UVC compatible).
It is giving error
"Could not create video."
Here is my code.
// Include standard OpenCV headers
include <iostream>
include <opencv cv.h="">
include <opencv highgui.h="">
using namespace std;
// All the new API is put into "cv" namespace using namespace cv;
int main (int argc, char *argv[]) { // Open the default camera VideoCapture capture(0);
// Check if the camera was opened
if(!capture.isOpened())
{
cerr << "Could not create capture";
return -1;
}
// Get the properties from the camera
double width = capture.get(CV_CAP_PROP_FRAME_WIDTH);
double height = capture.get(CV_CAP_PROP_FRAME_HEIGHT);
cout << "Camera properties\n";
cout << "width = " << width << endl <<"height = "<< height << endl;
// Create a matrix to keep the retrieved frame
Mat frame;
// Create a window to show the image
namedWindow ("Capture", CV_WINDOW_AUTOSIZE);
// Create the video writer
VideoWriter video("capture.avi", CV_FOURCC('Y', 'U', 'Y', 'V'), 30, cvSize((int)width,(int)height));
//video.open("capture.avi", -1, 30, cvSize((int)width,(int)height));
// Check if the video was opened
if(!video.isOpened())
{
cerr << "Could not create video.";
return -1;
}
cout << "Press Esc to stop recording." << endl;
// Get the next frame until the user presses the escape key
while(true)
{
// Get frame from capture
capture >> frame;
// Check if the frame was retrieved
if(!frame.data)
{
cerr << "Could not retrieve frame.";
return -1;
}
// Save frame to video
video << frame;
// Show image
imshow("Capture", frame);
// Exit with escape key
if(waitKey(1) == 27)
break;
}
// Exit
return 0;
}
the information about camera is as follows.
$ v4l2-ctl --all
Driver Info (not using libv4l2): Driver name : uvcvideo Card type : USB2.0 Camera Bus info : usb-0000:00:1d.0-1.5 Driver version: 3.2.40 Capabilities : 0x04000001 Video Capture Streaming Video input : 0 (Camera 1: ok) Format Video Capture: Width/Height : 640/480 Pixel Format : 'YUYV' Field : None Bytes per Line: 1280 Size Image : 1045178410 Colorspace : SRGB Crop Capability Video Capture: Bounds : Left 0, Top 0, Width 640, Height 480 Default : Left 0, Top 0, Width 640, Height 480 Pixel Aspect: 1/1 Streaming Parameters Video Capture: Capabilities : timeperframe Frames per second: 0.004 (1381/377737) Read buffers : 0 brightness (int) : min=-127 max=127 step=1 default=0 value=0 contrast (int) : min=0 max=127 step=1 default=64 value=64 saturation (int) : min=0 max=255 step=1 default=64 value=64 hue (int) : min=-16000 max=16000 step=1 default=0 value=0 gamma (int) : min=16 max=500 step=1 default=100 value=100 power_line_frequency (menu) : min=0 max=2 default=1 value=1 sharpness (int) : min=1 max=29 step=1 default=9 value=9 backlight_compensation (int) : min=0 max=1 step=1 default=0 value=0
Please help me how to solve this problem ..
