I am trying to capture some video from my IP-camera, but only got theese artefacts:
How do I fix it? Help me, please! Here is my code:
QString str1 = "rtsp://admin:000000#192.168.1.100:554/H264?ch=1&subtype=0";
cv::VideoCapture vcap = VideoCapture(str1.toStdString());
cv::Mat image;
if(!vcap.isOpened())
{
qDebug() << "Input error\n";
return;
}
namedWindow("window",CV_WINDOW_AUTOSIZE);
for(;;) {
Mat frame;
if(vcap.grab())
vcap.retrieve(image);
if (image.empty())
break;
imshow("window", image);
waitKey(1);
}
i working in a stereo camera project i have two cameras 5megapixels in every one i connected it with my laptop and run my code but when i run it i get this error libv4l2: error turning on stream: No space left on device
im linux os that's my c++ opencv code there are any ideas how to fix it i tried others codes i found it in network but still give me the same error
#include <opencv2/opencv.hpp>
int main()
{
cv::VideoCapture cap1(1);
cv::VideoCapture cap2(2);
if(!cap1.isOpened())
{
std::cout << "Cannot open the video cam [1]" << std::endl;
return -1;
}
if(!cap2.isOpened())
{
std::cout << "Cannot open the video cam [2]" << std::endl;
return -1;
}
cap1.set(CV_CAP_PROP_FPS, 15);
cap2.set(CV_CAP_PROP_FPS, 15);
// Values taken from output of Version 1 and used to setup the exact same parameters with the exact same values!
cap1.set(CV_CAP_PROP_FRAME_WIDTH, 640);
cap1.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
cap2.set(CV_CAP_PROP_FRAME_WIDTH, 640);
cap2.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
cv::namedWindow("cam[1]",CV_WINDOW_AUTOSIZE);
cv::namedWindow("cam[2]",CV_WINDOW_AUTOSIZE);
while(1)
{
cv::Mat frame1, frame2;
bool bSuccess1 = cap1.read(frame1);
bool bSuccess2 = cap2.read(frame2);
if (!bSuccess1)
{
std::cout << "Cannot read a frame from video stream [1]" << std::endl;
break;
}
if (!bSuccess2)
{
std::cout << "Cannot read a frame from video stream [2]" << std::endl;
break;
}
cv::imshow("cam[1]", frame1);
cv::imshow("cam[2]", frame2);
if(cv::waitKey(30) == 27)
{
std::cout << "ESC key is pressed by user" << std::endl;
break;
}
}
return 0;
}
I just want to show the IP camera video without sound, but this camera plays video with sound, and I get [mp3 # 0x107808800] Header missing in the console. How do I play without sound? I'm using vstarcam-30s. Here is my code:
int main (int argc, char *argv[])
{
VideoCapture vcap;
Mat image;
string videoStreamAddress =
"rtsp://[IPADDRESS]/profile2/media.smp";
if (!vcap.open(videoStreamAddress)) {
cout << "Error opening video stream or file" << endl;
return -1;
}
for(;;) {
if(!vcap.read(image)) {
cout << "No frame" << endl;
waitKey();
}
imshow("Output Window", image);
if(waitKey(1) >= 0) break;
}
return 0;
}
I am trying to get full HD processing using Qt and OpenCV, I can only get 480p at the moment, as you can see in the code I have got the width and height of the frame. I have also tried setting the size of the using cvSize(1920 x 1080) but it doesn't change the resolution.
Many thanks for any help!
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
VideoCapture cap(1); //capture webcam
if (!cap.isOpened()) //if not successful then exit
{
qDebug() << "Cannot open webcam";
return -1;
}
namedWindow("Camera feed", CV_WINDOW_AUTOSIZE); //create window
double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get width of frames of video
double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get height of frames of video
Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
qDebug() << "Frame size = " << dWidth << "x" << dHeight << endl;
VideoWriter oVideoWriter("video.avi", CV_FOURCC('M','P','E','G'), 20, frameSize);
if(!oVideoWriter.isOpened())
{
qDebug() << "ERROR: Failed to write the video" << endl;
return -1;
}
while(1)
{
Mat frame;
bool bSuccess = cap.read(frame); //read a new frame from video
if(!bSuccess) //if unsuccessful, break loop
{
qDebug() << "Cannot read frame from video file" << endl;
break;
}
oVideoWriter.write(frame); //write the frame into the file
imshow("Camera feed", frame); //show the frame in "Live Feed" window
qDebug() << "Recording" << endl;
if (waitKey(30) == 27)
{
qDebug() << "Esc key is pressed by user" << endl;
break;
}
}
return 0;
}
Have you tried setting forcing your capture to HD by setting the properties:
cap.set(CV_CAP_PROP_FRAME_WIDTH, 1920);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 1080);
If so, check if this resolution is supported by the device in other programs like guvcview or v4l2-ctl. If you have the last one installed you can check the supported modes with:
v4l2-ctl --list-formats
I am trying to make a program work, but for some reason i get a memory corruption error.
I am only using the "videoprocess" method and not the imageprocess method.
When I target a specific video, it works only once. When I try to use it again on the same video, i get this kind of error:
*** Error in `./camack': malloc(): memory corruption: 0x000000000234b2c0 ***
I cant figure out where is the problem...
Here's the code:
//opencv
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/background_segm.hpp>
//C
#include <stdio.h>
//C++
#include <iostream>
#include <sstream>
using namespace cv;
using namespace std;
//global variables
Mat frame; //current frame
Mat fgMaskMOG; //fg mask generated by MOG method
Mat fgMaskMOG2; //fg mask fg mask generated by MOG2 method
Ptr<BackgroundSubtractor> pMOG; //MOG Background subtractor
Ptr<BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
int keyboard;
//function declarations
void help();
void processVideo(char* videoFilename);
void processImages(char* firstFrameFilename);
void help()
{
cout
<< "--------------------------------------------------------------------------" << endl
<< "This program shows how to use background subtraction methods provided by " << endl
<< " OpenCV. You can process both videos (-vid) and images (-img)." << endl
<< endl
<< "Usage:" << endl
<< "./bs {-vid <video filename>|-img <image filename>}" << endl
<< "for example: ./bs -vid video.avi" << endl
<< "or: ./bs -img /data/images/1.png" << endl
<< "--------------------------------------------------------------------------" << endl
<< endl;
}
int main(int argc, char* argv[])
{
//print help information
help();
//check for the input parameter correctness
if(argc != 3) {
cerr <<"Incorret input list" << endl;
cerr <<"exiting..." << endl;
return EXIT_FAILURE;
}
//create GUI windows
namedWindow("Frame");
namedWindow("FG Mask MOG");
namedWindow("FG Mask MOG 2");
//create Background Subtractor objects
//NOTE HERE!!!!
pMOG= new BackgroundSubtractorMOG(); //MOG approach
pMOG2 = new BackgroundSubtractorMOG2(); //MOG2 approach
if(strcmp(argv[1], "-vid") == 0) {
//input data coming from a video
processVideo(argv[2]);
}
else if(strcmp(argv[1], "-img") == 0) {
//input data coming from a sequence of images
processImages(argv[2]);
}
else {
//error in reading input parameters
cerr <<"Please, check the input parameters." << endl;
cerr <<"Exiting..." << endl;
return EXIT_FAILURE;
}
//destroy GUI windows
destroyAllWindows();
return EXIT_SUCCESS;
}
void processVideo(char* videoFilename) {
//create the capture object
VideoCapture capture(videoFilename);
//VideoCapture capture(0);
if(!capture.isOpened()){
//error in opening the video input
cerr << "Unable to open video file: " << videoFilename << endl;
exit(EXIT_FAILURE);
}
//read input data. ESC or 'q' for quitting
while( (char)keyboard != 'q' && (char)keyboard != 27 ){
//read the current frame
if(!capture.read(frame)) {
cerr << "Unable to read next frame." << endl;
cerr << "Exiting..." << endl;
exit(EXIT_FAILURE);
}
//update the background model
//AND HERE!!!
pMOG->operator()(frame, fgMaskMOG);
pMOG2->operator()(frame, fgMaskMOG2);
//get the frame number and write it on the current frame
stringstream ss;
rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
cv::Scalar(255,255,255), -1);
ss << capture.get(CV_CAP_PROP_POS_FRAMES);
string frameNumberString = ss.str();
putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
//show the current frame and the fg masks
imshow("Frame", frame);
imshow("FG Mask MOG", fgMaskMOG);
imshow("FG Mask MOG 2", fgMaskMOG2);
//get the input from the keyboard
keyboard = waitKey( 30 );
}
//delete capture object
capture.release();
}
void processImages(char* fistFrameFilename) {
//read the first file of the sequence
frame = imread(fistFrameFilename);
if(!frame.data){
//error in opening the first image
cerr << "Unable to open first image frame: " << fistFrameFilename << endl;
exit(EXIT_FAILURE);
}
//current image filename
string fn(fistFrameFilename);
//read input data. ESC or 'q' for quitting
while( (char)keyboard != 'q' && (char)keyboard != 27 ){
//update the background model
//ALSO HERE!!!!
pMOG->operator()(frame, fgMaskMOG);
pMOG2->operator()(frame, fgMaskMOG2);
//get the frame number and write it on the current frame
size_t index = fn.find_last_of("/");
if(index == string::npos) {
index = fn.find_last_of("\\");
}
size_t index2 = fn.find_last_of(".");
string prefix = fn.substr(0,index+1);
string suffix = fn.substr(index2);
string frameNumberString = fn.substr(index+1, index2-index-1);
istringstream iss(frameNumberString);
int frameNumber = 0;
iss >> frameNumber;
rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
cv::Scalar(255,255,255), -1);
putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
//show the current frame and the fg masks
imshow("Frame", frame);
imshow("FG Mask MOG", fgMaskMOG);
imshow("FG Mask MOG 2", fgMaskMOG2);
//get the input from the keyboard
keyboard = waitKey( 30 );
//search for the next image in the sequence
ostringstream oss;
oss << (frameNumber + 1);
string nextFrameNumberString = oss.str();
string nextFrameFilename = prefix + nextFrameNumberString + suffix;
//read the next frame
frame = imread(nextFrameFilename);
if(!frame.data){
//error in opening the next image in the sequence
cerr << "Unable to open image frame: " << nextFrameFilename << endl;
exit(EXIT_FAILURE);
}
//update the path of the current frame
fn.assign(nextFrameFilename);
}
}
Can you help me on this one? thank you a lot
global vars are evil ! you should not use them.
here, Ptr<BackgroundSubtractor> pMOG2; will never get released
move it into main, and pass it as an arg to functions like processVideo()
also, all images passed to the BackgroundSubtractor must have the same size.
If you dont need the processImage part then remove it so that you can have a short code which is easy for you to understand. I have remove the irrelevant part. Here is the short code which is working fine here at my system;
//opencv
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/background_segm.hpp>
//C
#include <stdio.h>
//C++
#include <iostream>
#include <sstream>
using namespace cv;
using namespace std;
//global variables
Mat frame; //current frame
Mat fgMaskMOG; //fg mask generated by MOG method
Mat fgMaskMOG2; //fg mask fg mask generated by MOG2 method
Ptr<BackgroundSubtractor> pMOG; //MOG Background subtractor
Ptr<BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
int keyboard;
//function declarations
void processVideo(char* videoFilename);
int main(int argc, char* argv[])
{
//create GUI windows
namedWindow("Frame");
namedWindow("FG Mask MOG");
namedWindow("FG Mask MOG 2");
//create Background Subtractor objects
//NOTE HERE!!!!
pMOG= new BackgroundSubtractorMOG(); //MOG approach
pMOG2 = new BackgroundSubtractorMOG2(); //MOG2 approach
if(strcmp(argv[1], "-vid") == 0) {
//input data coming from a video
processVideo(argv[2]);
}
//destroy GUI windows
destroyAllWindows();
return EXIT_SUCCESS;
}
void processVideo(char* videoFilename) {
//create the capture object
VideoCapture capture(videoFilename);
//VideoCapture capture(0);
if(!capture.isOpened()){
//error in opening the video input
cerr << "Unable to open video file: " << videoFilename << endl;
exit(EXIT_FAILURE);
}
//read input data. ESC or 'q' for quitting
while( (char)keyboard != 'q' && (char)keyboard != 27 ){
//read the current frame
if(!capture.read(frame)) {
cerr << "Unable to read next frame." << endl;
cerr << "Exiting..." << endl;
exit(EXIT_FAILURE);
}
//update the background model
//AND HERE!!!
pMOG->operator()(frame, fgMaskMOG);
pMOG2->operator()(frame, fgMaskMOG2);
//get the frame number and write it on the current frame
stringstream ss;
rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
cv::Scalar(255,255,255), -1);
ss << capture.get(CV_CAP_PROP_POS_FRAMES);
string frameNumberString = ss.str();
putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
//show the current frame and the fg masks
imshow("Frame", frame);
imshow("FG Mask MOG", fgMaskMOG);
imshow("FG Mask MOG 2", fgMaskMOG2);
//get the input from the keyboard
keyboard = waitKey( 30 );
}
//delete capture object
capture.release();
}