ClementD's profile - activity

Do you have a working example on your pc?

Haha no problems. Thanks you.

Ok , i'll try tonight. Do you know where i can find all codec? or the most common codec? Moreover, is there a way to see VideoWriter status? because i don't have any error.

Hi, I switched it and it's still not working. I don't know why but the file was openned. It does create a file "outi.avi" but the file is empty (like 6Ko). Do you know if the probleme could comme from the file ffmpeg.dll? do i have to rename it ?or put it somewhere? maybe include it in my ".pro" file?

Hello I am using QT and OpenCV 3.1.0 on a Win7 PC.

I am trying to record my camera and i don't know why but the file is always empty. i tired using other codec but it's always fails. any idea?

int main(int argc, char *argv[])

{

cv::VideoCapture cap(0);
cv::VideoWriter rec;
bool first = true;
for(;;)
{
    cv::Mat frame;

    cap >> frame;
    if (first)
    {
        qDebug()<< "init";
        rec.open("C:/Project/outi.avi", CV_FOURCC('X','V','I','D'), 24, cv::Size(frame.size().height,frame.size().width));
        if (!rec.isOpened())
        {
            qDebug()<< "open record fail";
            return 0;
        }
        first = false;
    }
    rec << frame;
    cv::imshow("test", frame);
    if (cv::waitKey(30) == 'q')
    {
        break;
    }
}
return 0;

}

Hello ,

i wrote a little programme to open a camera with openCV and it always fails.

The error message is :

[rtsp @ 00000000003f7fc0] method SETUP failed: 461 Unsuported transport warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:578)

I have already been looking for solutions on furoms like : http://code.opencv.org/issues/2235 the modifications into the "cap_ffmpeg_impl.hpp" are already included in 3.1.0 and it's still fail openning the stream.

I do want to know if there is an existing solution for this problem.

Thanking you in advance,

Clément

Solution :

I finally solved the probleme using this example The solution uses libVlc to decode Frames and, by changing callbacks, creating cv::Mat.

I can give you my code if someone doesn't understand the example.

Thanks! it's done.

@StevenPuttmans Hello , how can i accept it?

Oh ok Thanks you a lot. your helped me very fastly. My probleme is solved.

Yes i change my point of view. how can i draw inside contours?

i tried this but it failed:

cv::polylines(img, contours.at(i), true, cv::Scalar(255,255,255), CV_FILLED);

I found it:

cv::fillConvexPoly  (img, contours.at(i), cv::Scalar(255, 0, 0));

If i use inRange (img, 1, 2, imageOut), i want to know where are the 1 and where are the 2

Thanks you , i will use inRange(img , myValue, myValue, binaryImage) then get my new contour with find contours. Is there a way to know how many differents values i had in my range?

Hello,

I post this message because in need help with a project.

I have a binary image that containt object i want to detect ( obtained with a backgroundSubtractor)

Once detected,I want to give each object a label on an other image (the label Image). Then on the next image ( because i use a video ), I want to know which object has already been labeled using the last label image.

I use "findContours" to get all contours;

my Question is : Is there any method or function that could help me to get all pixels of with a given value (for example 3 )? I would like a function like "cv::findNonZero " but more specified like "findNumberPixel".

By waiting you answer i start to try create my own tools.

Thanking you in advance

Solution : (Thanks to LBerger ) Using InRange with all my values allows me to detect the label i want DrawContour with filled option allows me to draw my labels

Hello,

I post this message because in need help with deployment.

I have done a program on Qt 5.5.1 using OpenCV 3.1.0. My problem is that when i want to procceed to the deployment with "windeployqt.exe ", windeploy add the Qt's ".dll" files but not the opencv ".dll"files. I would know if it is possible to do that automatically with Qt.

If not, i will create my own batch file that call windeployqt.exe , locate openCV files and add them . Godd idea?

Thanking you in advance for your help.

Thanks you berak . Then i have new question, How can i add this to my current project? just copy the .cpp and . hpp i need into my current opencv? or do i have to rebuild opencv? or just add in my .pro file a way to the include folder of the opencv_Contrib

I write my own code, i can use the MOG2 but i can't find the simple MOG background substractor

Hi ,

I am here because i do not come up to use a MOG background substractor with OpendCV 3.1.0

I don't know if it is an include probleme or anything else.

I followed this official tutorial :http://docs.opencv.org/3.1.0/d1/dc5/tutorial_background_subtraction.html#gsc.tab=0

But when i try to create a MOG background substractor like this:

Ptr<BackgroundSubtractor> pMOG; //MOG Background subtractor
Ptr<BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
...
//create Background Subtractor objects
pMOG = createBackgroundSubtractorMOG(); //MOG approach
pMOG2 = createBackgroundSubtractorMOG2(); //MOG2 approach

i get the error: cv has no member named "createBackgroundSubtractorMOG"

Can someone help me?

Edit: I write my own code, i can use the MOG2 but i can't find the simple MOG background substractor.

Solution: Thanks to berak: MOG was moved to opencv_contrib

Importing Contrib to OpenCV: Thanks to the Readme.md in github, i saw that the best way to improt contrib is to rebuild openCV using special option on CMake.

As a temporrary solution i copied the files in an external folder and i included them in my project.

As berak pointed out, the background substractor is in a new namespace, cv::bgsegm::createBackgroundSubtractorMOG(..)

But in the lib folder there is only "opencv_ts300" and "opencv_world" . is these two lib allow me to use all opencv?

So i have to build the lib?

Can't you read the number of the error? want me to traduct it?

Done . i put the begning becaus it could be too long